import Mesa 11.0.6

1 files changed, 3578 insertions, 0 deletions

diff --git a/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
new file mode 100644
index 000000000..b5c06b695
--- /dev/null
+++ b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
@@ -0,0 +1,3578 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Texture sampling -- SoA.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ * @author Brian Paul <brianp@vmware.com>
+ */
+
+#include "pipe/p_defines.h"
+#include "pipe/p_state.h"
+#include "pipe/p_shader_tokens.h"
+#include "util/u_debug.h"
+#include "util/u_dump.h"
+#include "util/u_memory.h"
+#include "util/u_math.h"
+#include "util/u_format.h"
+#include "util/u_cpu_detect.h"
+#include "util/u_format_rgb9e5.h"
+#include "lp_bld_debug.h"
+#include "lp_bld_type.h"
+#include "lp_bld_const.h"
+#include "lp_bld_conv.h"
+#include "lp_bld_arit.h"
+#include "lp_bld_bitarit.h"
+#include "lp_bld_logic.h"
+#include "lp_bld_printf.h"
+#include "lp_bld_swizzle.h"
+#include "lp_bld_flow.h"
+#include "lp_bld_gather.h"
+#include "lp_bld_format.h"
+#include "lp_bld_sample.h"
+#include "lp_bld_sample_aos.h"
+#include "lp_bld_struct.h"
+#include "lp_bld_quad.h"
+#include "lp_bld_pack.h"
+
+
+/**
+ * Generate code to fetch a texel from a texture at int coords (x, y, z).
+ * The computation depends on whether the texture is 1D, 2D or 3D.
+ * The result, texel, will be float vectors:
+ *   texel[0] = red values
+ *   texel[1] = green values
+ *   texel[2] = blue values
+ *   texel[3] = alpha values
+ */
+static void
+lp_build_sample_texel_soa(struct lp_build_sample_context *bld,
+                          LLVMValueRef width,
+                          LLVMValueRef height,
+                          LLVMValueRef depth,
+                          LLVMValueRef x,
+                          LLVMValueRef y,
+                          LLVMValueRef z,
+                          LLVMValueRef y_stride,
+                          LLVMValueRef z_stride,
+                          LLVMValueRef data_ptr,
+                          LLVMValueRef mipoffsets,
+                          LLVMValueRef texel_out[4])
+{
+   const struct lp_static_sampler_state *static_state = bld->static_sampler_state;
+   const unsigned dims = bld->dims;
+   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+   LLVMBuilderRef builder = bld->gallivm->builder;
+   LLVMValueRef offset;
+   LLVMValueRef i, j;
+   LLVMValueRef use_border = NULL;
+
+   /* use_border = x < 0 || x >= width || y < 0 || y >= height */
+   if (lp_sampler_wrap_mode_uses_border_color(static_state->wrap_s,
+                                              static_state->min_img_filter,
+                                              static_state->mag_img_filter)) {
+      LLVMValueRef b1, b2;
+      b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, x, int_coord_bld->zero);
+      b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, x, width);
+      use_border = LLVMBuildOr(builder, b1, b2, "b1_or_b2");
+   }
+
+   if (dims >= 2 &&
+       lp_sampler_wrap_mode_uses_border_color(static_state->wrap_t,
+                                              static_state->min_img_filter,
+                                              static_state->mag_img_filter)) {
+      LLVMValueRef b1, b2;
+      b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, y, int_coord_bld->zero);
+      b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, y, height);
+      if (use_border) {
+         use_border = LLVMBuildOr(builder, use_border, b1, "ub_or_b1");
+         use_border = LLVMBuildOr(builder, use_border, b2, "ub_or_b2");
+      }
+      else {
+         use_border = LLVMBuildOr(builder, b1, b2, "b1_or_b2");
+      }
+   }
+
+   if (dims == 3 &&
+       lp_sampler_wrap_mode_uses_border_color(static_state->wrap_r,
+                                              static_state->min_img_filter,
+                                              static_state->mag_img_filter)) {
+      LLVMValueRef b1, b2;
+      b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, z, int_coord_bld->zero);
+      b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, z, depth);
+      if (use_border) {
+         use_border = LLVMBuildOr(builder, use_border, b1, "ub_or_b1");
+         use_border = LLVMBuildOr(builder, use_border, b2, "ub_or_b2");
+      }
+      else {
+         use_border = LLVMBuildOr(builder, b1, b2, "b1_or_b2");
+      }
+   }
+
+   /* convert x,y,z coords to linear offset from start of texture, in bytes */
+   lp_build_sample_offset(&bld->int_coord_bld,
+                          bld->format_desc,
+                          x, y, z, y_stride, z_stride,
+                          &offset, &i, &j);
+   if (mipoffsets) {
+      offset = lp_build_add(&bld->int_coord_bld, offset, mipoffsets);
+   }
+
+   if (use_border) {
+      /* If we can sample the border color, it means that texcoords may
+       * lie outside the bounds of the texture image.  We need to do
+       * something to prevent reading out of bounds and causing a segfault.
+       *
+       * Simply AND the texture coords with !use_border.  This will cause
+       * coords which are out of bounds to become zero.  Zero's guaranteed
+       * to be inside the texture image.
+       */
+      offset = lp_build_andnot(&bld->int_coord_bld, offset, use_border);
+   }
+
+   lp_build_fetch_rgba_soa(bld->gallivm,
+                           bld->format_desc,
+                           bld->texel_type,
+                           data_ptr, offset,
+                           i, j,
+                           texel_out);
+
+   /*
+    * Note: if we find an app which frequently samples the texture border
+    * we might want to implement a true conditional here to avoid sampling
+    * the texture whenever possible (since that's quite a bit of code).
+    * Ex:
+    *   if (use_border) {
+    *      texel = border_color;
+    *   }
+    *   else {
+    *      texel = sample_texture(coord);
+    *   }
+    * As it is now, we always sample the texture, then selectively replace
+    * the texel color results with the border color.
+    */
+
+   if (use_border) {
+      /* select texel color or border color depending on use_border. */
+      const struct util_format_description *format_desc = bld->format_desc;
+      int chan;
+      struct lp_type border_type = bld->texel_type;
+      border_type.length = 4;
+      /*
+       * Only replace channels which are actually present. The others should
+       * get optimized away eventually by sampler_view swizzle anyway but it's
+       * easier too.
+       */
+      for (chan = 0; chan < 4; chan++) {
+         unsigned chan_s;
+         /* reverse-map channel... */
+         for (chan_s = 0; chan_s < 4; chan_s++) {
+            if (chan_s == format_desc->swizzle[chan]) {
+               break;
+            }
+         }
+         if (chan_s <= 3) {
+            /* use the already clamped color */
+            LLVMValueRef idx = lp_build_const_int32(bld->gallivm, chan);
+            LLVMValueRef border_chan;
+
+            border_chan = lp_build_extract_broadcast(bld->gallivm,
+                                                     border_type,
+                                                     bld->texel_type,
+                                                     bld->border_color_clamped,
+                                                     idx);
+            texel_out[chan] = lp_build_select(&bld->texel_bld, use_border,
+                                              border_chan, texel_out[chan]);
+         }
+      }
+   }
+}
+
+
+/**
+ * Helper to compute the mirror function for the PIPE_WRAP_MIRROR modes.
+ */
+static LLVMValueRef
+lp_build_coord_mirror(struct lp_build_sample_context *bld,
+                      LLVMValueRef coord)
+{
+   struct lp_build_context *coord_bld = &bld->coord_bld;
+   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+   LLVMValueRef fract, flr, isOdd;
+
+   lp_build_ifloor_fract(coord_bld, coord, &flr, &fract);
+
+   /* isOdd = flr & 1 */
+   isOdd = LLVMBuildAnd(bld->gallivm->builder, flr, int_coord_bld->one, "");
+
+   /* make coord positive or negative depending on isOdd */
+   coord = lp_build_set_sign(coord_bld, fract, isOdd);
+
+   /* convert isOdd to float */
+   isOdd = lp_build_int_to_float(coord_bld, isOdd);
+
+   /* add isOdd to coord */
+   coord = lp_build_add(coord_bld, coord, isOdd);
+
+   return coord;
+}
+
+
+/**
+ * Helper to compute the first coord and the weight for
+ * linear wrap repeat npot textures
+ */
+void
+lp_build_coord_repeat_npot_linear(struct lp_build_sample_context *bld,
+                                  LLVMValueRef coord_f,
+                                  LLVMValueRef length_i,
+                                  LLVMValueRef length_f,
+                                  LLVMValueRef *coord0_i,
+                                  LLVMValueRef *weight_f)
+{
+   struct lp_build_context *coord_bld = &bld->coord_bld;
+   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+   LLVMValueRef half = lp_build_const_vec(bld->gallivm, coord_bld->type, 0.5);
+   LLVMValueRef length_minus_one = lp_build_sub(int_coord_bld, length_i,
+                                                int_coord_bld->one);
+   LLVMValueRef mask;
+   /* wrap with normalized floats is just fract */
+   coord_f = lp_build_fract(coord_bld, coord_f);
+   /* mul by size and subtract 0.5 */
+   coord_f = lp_build_mul(coord_bld, coord_f, length_f);
+   coord_f = lp_build_sub(coord_bld, coord_f, half);
+   /*
+    * we avoided the 0.5/length division before the repeat wrap,
+    * now need to fix up edge cases with selects
+    */
+   /* convert to int, compute lerp weight */
+   lp_build_ifloor_fract(coord_bld, coord_f, coord0_i, weight_f);
+   mask = lp_build_compare(int_coord_bld->gallivm, int_coord_bld->type,
+                           PIPE_FUNC_LESS, *coord0_i, int_coord_bld->zero);
+   *coord0_i = lp_build_select(int_coord_bld, mask, length_minus_one, *coord0_i);
+}
+
+
+/**
+ * Build LLVM code for texture wrap mode for linear filtering.
+ * \param x0_out  returns first integer texcoord
+ * \param x1_out  returns second integer texcoord
+ * \param weight_out  returns linear interpolation weight
+ */
+static void
+lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
+                            LLVMValueRef coord,
+                            LLVMValueRef length,
+                            LLVMValueRef length_f,
+                            LLVMValueRef offset,
+                            boolean is_pot,
+                            unsigned wrap_mode,
+                            LLVMValueRef *x0_out,
+                            LLVMValueRef *x1_out,
+                            LLVMValueRef *weight_out)
+{
+   struct lp_build_context *coord_bld = &bld->coord_bld;
+   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+   LLVMBuilderRef builder = bld->gallivm->builder;
+   LLVMValueRef half = lp_build_const_vec(bld->gallivm, coord_bld->type, 0.5);
+   LLVMValueRef length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one);
+   LLVMValueRef coord0, coord1, weight;
+
+   switch(wrap_mode) {
+   case PIPE_TEX_WRAP_REPEAT:
+      if (is_pot) {
+         /* mul by size and subtract 0.5 */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+         coord = lp_build_sub(coord_bld, coord, half);
+         if (offset) {
+            offset = lp_build_int_to_float(coord_bld, offset);
+            coord = lp_build_add(coord_bld, coord, offset);
+         }
+         /* convert to int, compute lerp weight */
+         lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);
+         coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+         /* repeat wrap */
+         coord0 = LLVMBuildAnd(builder, coord0, length_minus_one, "");
+         coord1 = LLVMBuildAnd(builder, coord1, length_minus_one, "");
+      }
+      else {
+         LLVMValueRef mask;
+         if (offset) {
+            offset = lp_build_int_to_float(coord_bld, offset);
+            offset = lp_build_div(coord_bld, offset, length_f);
+            coord = lp_build_add(coord_bld, coord, offset);
+         }
+         lp_build_coord_repeat_npot_linear(bld, coord,
+                                           length, length_f,
+                                           &coord0, &weight);
+         mask = lp_build_compare(int_coord_bld->gallivm, int_coord_bld->type,
+                                 PIPE_FUNC_NOTEQUAL, coord0, length_minus_one);
+         coord1 = LLVMBuildAnd(builder,
+                               lp_build_add(int_coord_bld, coord0, int_coord_bld->one),
+                               mask, "");
+      }
+      break;
+
+   case PIPE_TEX_WRAP_CLAMP:
+      if (bld->static_sampler_state->normalized_coords) {
+         /* scale coord to length */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+      }
+      if (offset) {
+         offset = lp_build_int_to_float(coord_bld, offset);
+         coord = lp_build_add(coord_bld, coord, offset);
+      }
+
+      /* clamp to [0, length] */
+      coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, length_f);
+
+      coord = lp_build_sub(coord_bld, coord, half);
+
+      /* convert to int, compute lerp weight */
+      lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);
+      coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+      break;
+
+   case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
+      {
+         struct lp_build_context abs_coord_bld = bld->coord_bld;
+         abs_coord_bld.type.sign = FALSE;
+
+         if (bld->static_sampler_state->normalized_coords) {
+            /* mul by tex size */
+            coord = lp_build_mul(coord_bld, coord, length_f);
+         }
+         if (offset) {
+            offset = lp_build_int_to_float(coord_bld, offset);
+            coord = lp_build_add(coord_bld, coord, offset);
+         }
+
+         /* clamp to length max */
+         coord = lp_build_min(coord_bld, coord, length_f);
+         /* subtract 0.5 */
+         coord = lp_build_sub(coord_bld, coord, half);
+         /* clamp to [0, length - 0.5] */
+         coord = lp_build_max(coord_bld, coord, coord_bld->zero);
+         /* convert to int, compute lerp weight */
+         lp_build_ifloor_fract(&abs_coord_bld, coord, &coord0, &weight);
+         coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+         /* coord1 = min(coord1, length-1) */
+         coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one);
+         break;
+      }
+
+   case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
+      if (bld->static_sampler_state->normalized_coords) {
+         /* scale coord to length */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+      }
+      if (offset) {
+         offset = lp_build_int_to_float(coord_bld, offset);
+         coord = lp_build_add(coord_bld, coord, offset);
+      }
+      /* was: clamp to [-0.5, length + 0.5], then sub 0.5 */
+      /* can skip clamp (though might not work for very large coord values */
+      coord = lp_build_sub(coord_bld, coord, half);
+      /* convert to int, compute lerp weight */
+      lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);
+      coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+      break;
+
+   case PIPE_TEX_WRAP_MIRROR_REPEAT:
+      /* compute mirror function */
+      coord = lp_build_coord_mirror(bld, coord);
+
+      /* scale coord to length */
+      coord = lp_build_mul(coord_bld, coord, length_f);
+      coord = lp_build_sub(coord_bld, coord, half);
+      if (offset) {
+         offset = lp_build_int_to_float(coord_bld, offset);
+         coord = lp_build_add(coord_bld, coord, offset);
+      }
+
+      /* convert to int, compute lerp weight */
+      lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);
+      coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+
+      /* coord0 = max(coord0, 0) */
+      coord0 = lp_build_max(int_coord_bld, coord0, int_coord_bld->zero);
+      /* coord1 = min(coord1, length-1) */
+      coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one);
+      break;
+
+   case PIPE_TEX_WRAP_MIRROR_CLAMP:
+      if (bld->static_sampler_state->normalized_coords) {
+         /* scale coord to length */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+      }
+      if (offset) {
+         offset = lp_build_int_to_float(coord_bld, offset);
+         coord = lp_build_add(coord_bld, coord, offset);
+      }
+      coord = lp_build_abs(coord_bld, coord);
+
+      /* clamp to [0, length] */
+      coord = lp_build_min(coord_bld, coord, length_f);
+
+      coord = lp_build_sub(coord_bld, coord, half);
+
+      /* convert to int, compute lerp weight */
+      lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);
+      coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+      break;
+
+   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
+      {
+         struct lp_build_context abs_coord_bld = bld->coord_bld;
+         abs_coord_bld.type.sign = FALSE;
+
+         if (bld->static_sampler_state->normalized_coords) {
+            /* scale coord to length */
+            coord = lp_build_mul(coord_bld, coord, length_f);
+         }
+         if (offset) {
+            offset = lp_build_int_to_float(coord_bld, offset);
+            coord = lp_build_add(coord_bld, coord, offset);
+         }
+         coord = lp_build_abs(coord_bld, coord);
+
+         /* clamp to length max */
+         coord = lp_build_min(coord_bld, coord, length_f);
+         /* subtract 0.5 */
+         coord = lp_build_sub(coord_bld, coord, half);
+         /* clamp to [0, length - 0.5] */
+         coord = lp_build_max(coord_bld, coord, coord_bld->zero);
+
+         /* convert to int, compute lerp weight */
+         lp_build_ifloor_fract(&abs_coord_bld, coord, &coord0, &weight);
+         coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+         /* coord1 = min(coord1, length-1) */
+         coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one);
+      }
+      break;
+
+   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
+      {
+         if (bld->static_sampler_state->normalized_coords) {
+            /* scale coord to length */
+            coord = lp_build_mul(coord_bld, coord, length_f);
+         }
+         if (offset) {
+            offset = lp_build_int_to_float(coord_bld, offset);
+            coord = lp_build_add(coord_bld, coord, offset);
+         }
+         coord = lp_build_abs(coord_bld, coord);
+
+         /* was: clamp to [-0.5, length + 0.5] then sub 0.5 */
+         /* skip clamp - always positive, and other side
+            only potentially matters for very large coords */
+         coord = lp_build_sub(coord_bld, coord, half);
+
+         /* convert to int, compute lerp weight */
+         lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);
+         coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
+      }
+      break;
+
+   default:
+      assert(0);
+      coord0 = NULL;
+      coord1 = NULL;
+      weight = NULL;
+   }
+
+   *x0_out = coord0;
+   *x1_out = coord1;
+   *weight_out = weight;
+}
+
+
+/**
+ * Build LLVM code for texture wrap mode for nearest filtering.
+ * \param coord  the incoming texcoord (nominally in [0,1])
+ * \param length  the texture size along one dimension, as int vector
+ * \param length_f  the texture size along one dimension, as float vector
+ * \param offset  texel offset along one dimension (as int vector)
+ * \param is_pot  if TRUE, length is a power of two
+ * \param wrap_mode  one of PIPE_TEX_WRAP_x
+ */
+static LLVMValueRef
+lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
+                             LLVMValueRef coord,
+                             LLVMValueRef length,
+                             LLVMValueRef length_f,
+                             LLVMValueRef offset,
+                             boolean is_pot,
+                             unsigned wrap_mode)
+{
+   struct lp_build_context *coord_bld = &bld->coord_bld;
+   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+   LLVMBuilderRef builder = bld->gallivm->builder;
+   LLVMValueRef length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one);
+   LLVMValueRef icoord;
+   
+   switch(wrap_mode) {
+   case PIPE_TEX_WRAP_REPEAT:
+      if (is_pot) {
+         coord = lp_build_mul(coord_bld, coord, length_f);
+         icoord = lp_build_ifloor(coord_bld, coord);
+         if (offset) {
+            icoord = lp_build_add(int_coord_bld, icoord, offset);
+         }
+         icoord = LLVMBuildAnd(builder, icoord, length_minus_one, "");
+      }
+      else {
+          if (offset) {
+             offset = lp_build_int_to_float(coord_bld, offset);
+             offset = lp_build_div(coord_bld, offset, length_f);
+             coord = lp_build_add(coord_bld, coord, offset);
+          }
+          /* take fraction, unnormalize */
+          coord = lp_build_fract_safe(coord_bld, coord);
+          coord = lp_build_mul(coord_bld, coord, length_f);
+          icoord = lp_build_itrunc(coord_bld, coord);
+      }
+      break;
+
+   case PIPE_TEX_WRAP_CLAMP:
+   case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
+      if (bld->static_sampler_state->normalized_coords) {
+         /* scale coord to length */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+      }
+
+      /* floor */
+      /* use itrunc instead since we clamp to 0 anyway */
+      icoord = lp_build_itrunc(coord_bld, coord);
+      if (offset) {
+         icoord = lp_build_add(int_coord_bld, icoord, offset);
+      }
+
+      /* clamp to [0, length - 1]. */
+      icoord = lp_build_clamp(int_coord_bld, icoord, int_coord_bld->zero,
+                              length_minus_one);
+      break;
+
+   case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
+      if (bld->static_sampler_state->normalized_coords) {
+         /* scale coord to length */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+      }
+      /* no clamp necessary, border masking will handle this */
+      icoord = lp_build_ifloor(coord_bld, coord);
+      if (offset) {
+         icoord = lp_build_add(int_coord_bld, icoord, offset);
+      }
+      break;
+
+   case PIPE_TEX_WRAP_MIRROR_REPEAT:
+      if (offset) {
+         offset = lp_build_int_to_float(coord_bld, offset);
+         offset = lp_build_div(coord_bld, offset, length_f);
+         coord = lp_build_add(coord_bld, coord, offset);
+      }
+      /* compute mirror function */
+      coord = lp_build_coord_mirror(bld, coord);
+
+      /* scale coord to length */
+      assert(bld->static_sampler_state->normalized_coords);
+      coord = lp_build_mul(coord_bld, coord, length_f);
+
+      /* itrunc == ifloor here */
+      icoord = lp_build_itrunc(coord_bld, coord);
+
+      /* clamp to [0, length - 1] */
+      icoord = lp_build_min(int_coord_bld, icoord, length_minus_one);
+      break;
+
+   case PIPE_TEX_WRAP_MIRROR_CLAMP:
+   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
+      if (bld->static_sampler_state->normalized_coords) {
+         /* scale coord to length */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+      }
+      if (offset) {
+         offset = lp_build_int_to_float(coord_bld, offset);
+         coord = lp_build_add(coord_bld, coord, offset);
+      }
+      coord = lp_build_abs(coord_bld, coord);
+
+      /* itrunc == ifloor here */
+      icoord = lp_build_itrunc(coord_bld, coord);
+
+      /* clamp to [0, length - 1] */
+      icoord = lp_build_min(int_coord_bld, icoord, length_minus_one);
+      break;
+
+   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
+      if (bld->static_sampler_state->normalized_coords) {
+         /* scale coord to length */
+         coord = lp_build_mul(coord_bld, coord, length_f);
+      }
+      if (offset) {
+         offset = lp_build_int_to_float(coord_bld, offset);
+         coord = lp_build_add(coord_bld, coord, offset);
+      }
+      coord = lp_build_abs(coord_bld, coord);
+
+      /* itrunc == ifloor here */
+      icoord = lp_build_itrunc(coord_bld, coord);
+      break;
+
+   default:
+      assert(0);
+      icoord = NULL;
+   }
+
+   return icoord;
+}
+
+
+/**
+ * Do shadow test/comparison.
+ * \param p shadow ref value
+ * \param texel  the texel to compare against
+ */
+static LLVMValueRef
+lp_build_sample_comparefunc(struct lp_build_sample_context *bld,
+                            LLVMValueRef p,
+                            LLVMValueRef texel)
+{
+   struct lp_build_context *texel_bld = &bld->texel_bld;
+   LLVMValueRef res;
+
+   if (0) {
+      //lp_build_print_value(bld->gallivm, "shadow cmp coord", p);
+      lp_build_print_value(bld->gallivm, "shadow cmp texel", texel);
+   }
+
+   /* result = (p FUNC texel) ? 1 : 0 */
+   /*
+    * honor d3d10 floating point rules here, which state that comparisons
+    * are ordered except NOT_EQUAL which is unordered.
+    */
+   if (bld->static_sampler_state->compare_func != PIPE_FUNC_NOTEQUAL) {
+      res = lp_build_cmp_ordered(texel_bld, bld->static_sampler_state->compare_func,
+                                 p, texel);
+   }
+   else {
+      res = lp_build_cmp(texel_bld, bld->static_sampler_state->compare_func,
+                         p, texel);
+   }
+   return res;
+}
+
+
+/**
+ * Generate code to sample a mipmap level with nearest filtering.
+ * If sampling a cube texture, r = cube face in [0,5].
+ */
+static void
+lp_build_sample_image_nearest(struct lp_build_sample_context *bld,
+                              LLVMValueRef size,
+                              LLVMValueRef row_stride_vec,
+                              LLVMValueRef img_stride_vec,
+                              LLVMValueRef data_ptr,
+                              LLVMValueRef mipoffsets,
+                              LLVMValueRef *coords,
+                              const LLVMValueRef *offsets,
+                              LLVMValueRef colors_out[4])
+{
+   const unsigned dims = bld->dims;
+   LLVMValueRef width_vec;
+   LLVMValueRef height_vec;
+   LLVMValueRef depth_vec;
+   LLVMValueRef flt_size;
+   LLVMValueRef flt_width_vec;
+   LLVMValueRef flt_height_vec;
+   LLVMValueRef flt_depth_vec;
+   LLVMValueRef x, y = NULL, z = NULL;
+
+   lp_build_extract_image_sizes(bld,
+                                &bld->int_size_bld,
+                                bld->int_coord_type,
+                                size,
+                                &width_vec, &height_vec, &depth_vec);
+
+   flt_size = lp_build_int_to_float(&bld->float_size_bld, size);
+
+   lp_build_extract_image_sizes(bld,
+                                &bld->float_size_bld,
+                                bld->coord_type,
+                                flt_size,
+                                &flt_width_vec, &flt_height_vec, &flt_depth_vec);
+
+   /*
+    * Compute integer texcoords.
+    */
+   x = lp_build_sample_wrap_nearest(bld, coords[0], width_vec,
+                                    flt_width_vec, offsets[0],
+                                    bld->static_texture_state->pot_width,
+                                    bld->static_sampler_state->wrap_s);
+   lp_build_name(x, "tex.x.wrapped");
+
+   if (dims >= 2) {
+      y = lp_build_sample_wrap_nearest(bld, coords[1], height_vec,
+                                       flt_height_vec, offsets[1],
+                                       bld->static_texture_state->pot_height,
+                                       bld->static_sampler_state->wrap_t);
+      lp_build_name(y, "tex.y.wrapped");
+
+      if (dims == 3) {
+         z = lp_build_sample_wrap_nearest(bld, coords[2], depth_vec,
+                                          flt_depth_vec, offsets[2],
+                                          bld->static_texture_state->pot_depth,
+                                          bld->static_sampler_state->wrap_r);
+         lp_build_name(z, "tex.z.wrapped");
+      }
+   }
+   if (has_layer_coord(bld->static_texture_state->target)) {
+      if (bld->static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) {
+         /* add cube layer to face */
+         z = lp_build_add(&bld->int_coord_bld, coords[2], coords[3]);
+      }
+      else {
+         z = coords[2];
+      }
+      lp_build_name(z, "tex.z.layer");
+   }
+
+   /*
+    * Get texture colors.
+    */
+   lp_build_sample_texel_soa(bld,
+                             width_vec, height_vec, depth_vec,
+                             x, y, z,
+                             row_stride_vec, img_stride_vec,
+                             data_ptr, mipoffsets, colors_out);
+
+   if (bld->static_sampler_state->compare_mode != PIPE_TEX_COMPARE_NONE) {
+      LLVMValueRef cmpval;
+      cmpval = lp_build_sample_comparefunc(bld, coords[4], colors_out[0]);
+      /* this is really just a AND 1.0, cmpval but llvm is clever enough */
+      colors_out[0] = lp_build_select(&bld->texel_bld, cmpval,
+                                      bld->texel_bld.one, bld->texel_bld.zero);
+      colors_out[1] = colors_out[2] = colors_out[3] = colors_out[0];
+   }
+
+}
+
+
+/**
+ * Like a lerp, but inputs are 0/~0 masks, so can simplify slightly.
+ */
+static LLVMValueRef
+lp_build_masklerp(struct lp_build_context *bld,
+                 LLVMValueRef weight,
+                 LLVMValueRef mask0,
+                 LLVMValueRef mask1)
+{
+   struct gallivm_state *gallivm = bld->gallivm;
+   LLVMBuilderRef builder = gallivm->builder;
+   LLVMValueRef weight2;
+
+   weight2 = lp_build_sub(bld, bld->one, weight);
+   weight = LLVMBuildBitCast(builder, weight,
+                              lp_build_int_vec_type(gallivm, bld->type), "");
+   weight2 = LLVMBuildBitCast(builder, weight2,
+                              lp_build_int_vec_type(gallivm, bld->type), "");
+   weight = LLVMBuildAnd(builder, weight, mask1, "");
+   weight2 = LLVMBuildAnd(builder, weight2, mask0, "");
+   weight = LLVMBuildBitCast(builder, weight, bld->vec_type, "");
+   weight2 = LLVMBuildBitCast(builder, weight2, bld->vec_type, "");
+   return lp_build_add(bld, weight, weight2);
+}
+
+/**
+ * Like a 2d lerp, but inputs are 0/~0 masks, so can simplify slightly.
+ */
+static LLVMValueRef
+lp_build_masklerp2d(struct lp_build_context *bld,
+                    LLVMValueRef weight0,
+                    LLVMValueRef weight1,
+                    LLVMValueRef mask00,
+                    LLVMValueRef mask01,
+                    LLVMValueRef mask10,
+                    LLVMValueRef mask11)
+{
+   LLVMValueRef val0 = lp_build_masklerp(bld, weight0, mask00, mask01);
+   LLVMValueRef val1 = lp_build_masklerp(bld, weight0, mask10, mask11);
+   return lp_build_lerp(bld, weight1, val0, val1, 0);
+}
+
+/*
+ * this is a bit excessive code for something OpenGL just recommends
+ * but does not require.
+ */
+#define ACCURATE_CUBE_CORNERS 1
+
+/**
+ * Generate code to sample a mipmap level with linear filtering.
+ * If sampling a cube texture, r = cube face in [0,5].
+ * If linear_mask is present, only pixels having their mask set
+ * will receive linear filtering, the rest will use nearest.
+ */
+static void
+lp_build_sample_image_linear(struct lp_build_sample_context *bld,
+                             boolean is_gather,
+                             LLVMValueRef size,
+                             LLVMValueRef linear_mask,
+                             LLVMValueRef row_stride_vec,
+                             LLVMValueRef img_stride_vec,
+                             LLVMValueRef data_ptr,
+                             LLVMValueRef mipoffsets,
+                             LLVMValueRef *coords,
+                             const LLVMValueRef *offsets,
+                             LLVMValueRef colors_out[4])
+{
+   LLVMBuilderRef builder = bld->gallivm->builder;
+   struct lp_build_context *ivec_bld = &bld->int_coord_bld;
+   struct lp_build_context *coord_bld = &bld->coord_bld;
+   struct lp_build_context *texel_bld = &bld->texel_bld;
+   const unsigned dims = bld->dims;
+   LLVMValueRef width_vec;
+   LLVMValueRef height_vec;
+   LLVMValueRef depth_vec;
+   LLVMValueRef flt_size;
+   LLVMValueRef flt_width_vec;
+   LLVMValueRef flt_height_vec;
+   LLVMValueRef flt_depth_vec;
+   LLVMValueRef fall_off[4], have_corners;
+   LLVMValueRef z1 = NULL;
+   LLVMValueRef z00 = NULL, z01 = NULL, z10 = NULL, z11 = NULL;
+   LLVMValueRef x00 = NULL, x01 = NULL, x10 = NULL, x11 = NULL;
+   LLVMValueRef y00 = NULL, y01 = NULL, y10 = NULL, y11 = NULL;
+   LLVMValueRef s_fpart, t_fpart = NULL, r_fpart = NULL;
+   LLVMValueRef xs[4], ys[4], zs[4];
+   LLVMValueRef neighbors[2][2][4];
+   int chan, texel_index;
+   boolean seamless_cube_filter, accurate_cube_corners;
+
+   seamless_cube_filter = (bld->static_texture_state->target == PIPE_TEXTURE_CUBE ||
+                           bld->static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) &&
+                          bld->static_sampler_state->seamless_cube_map;
+   /*
+    * XXX I don't know how this is really supposed to work with gather. From GL
+    * spec wording (not gather specific) it sounds like the 4th missing texel
+    * should be an average of the other 3, hence for gather could return this.
+    * This is however NOT how the code here works, which just fixes up the
+    * weights used for filtering instead. And of course for gather there is
+    * no filter to tweak...
+    */
+   accurate_cube_corners = ACCURATE_CUBE_CORNERS && seamless_cube_filter &&
+                           !is_gather;
+
+   lp_build_extract_image_sizes(bld,
+                                &bld->int_size_bld,
+                                bld->int_coord_type,
+                                size,
+                                &width_vec, &height_vec, &depth_vec);
+
+   flt_size = lp_build_int_to_float(&bld->float_size_bld, size);
+
+   lp_build_extract_image_sizes(bld,
+                                &bld->float_size_bld,
+                                bld->coord_type,
+                                flt_size,
+                                &flt_width_vec, &flt_height_vec, &flt_depth_vec);
+
+   /*
+    * Compute integer texcoords.
+    */
+
+   if (!seamless_cube_filter) {
+      lp_build_sample_wrap_linear(bld, coords[0], width_vec,
+                                  flt_width_vec, offsets[0],
+                                  bld->static_texture_state->pot_width,
+                                  bld->static_sampler_state->wrap_s,
+                                  &x00, &x01, &s_fpart);
+      lp_build_name(x00, "tex.x0.wrapped");
+      lp_build_name(x01, "tex.x1.wrapped");
+      x10 = x00;
+      x11 = x01;
+
+      if (dims >= 2) {
+         lp_build_sample_wrap_linear(bld, coords[1], height_vec,
+                                     flt_height_vec, offsets[1],
+                                     bld->static_texture_state->pot_height,
+                                     bld->static_sampler_state->wrap_t,
+                                     &y00, &y10, &t_fpart);
+         lp_build_name(y00, "tex.y0.wrapped");
+         lp_build_name(y10, "tex.y1.wrapped");
+         y01 = y00;
+         y11 = y10;
+
+         if (dims == 3) {
+            lp_build_sample_wrap_linear(bld, coords[2], depth_vec,
+                                        flt_depth_vec, offsets[2],
+                                        bld->static_texture_state->pot_depth,
+                                        bld->static_sampler_state->wrap_r,
+                                        &z00, &z1, &r_fpart);
+            z01 = z10 = z11 = z00;
+            lp_build_name(z00, "tex.z0.wrapped");
+            lp_build_name(z1, "tex.z1.wrapped");
+         }
+      }
+      if (has_layer_coord(bld->static_texture_state->target)) {
+         if (bld->static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) {
+            /* add cube layer to face */
+            z00 = z01 = z10 = z11 = z1 =
+               lp_build_add(&bld->int_coord_bld, coords[2], coords[3]);
+         }
+         else {
+            z00 = z01 = z10 = z11 = z1 = coords[2];  /* cube face or layer */
+         }
+         lp_build_name(z00, "tex.z0.layer");
+         lp_build_name(z1, "tex.z1.layer");
+      }
+   }
+   else {
+      struct lp_build_if_state edge_if;
+      LLVMTypeRef int1t;
+      LLVMValueRef new_faces[4], new_xcoords[4][2], new_ycoords[4][2];
+      LLVMValueRef coord, have_edge, have_corner;
+      LLVMValueRef fall_off_ym_notxm, fall_off_ym_notxp, fall_off_x, fall_off_y;
+      LLVMValueRef fall_off_yp_notxm, fall_off_yp_notxp;
+      LLVMValueRef x0, x1, y0, y1, y0_clamped, y1_clamped;
+      LLVMValueRef face = coords[2];
+      LLVMValueRef half = lp_build_const_vec(bld->gallivm, coord_bld->type, 0.5f);
+      LLVMValueRef length_minus_one = lp_build_sub(ivec_bld, width_vec, ivec_bld->one);
+      /* XXX drop height calcs. Could (should) do this without seamless filtering too */
+      height_vec = width_vec;
+      flt_height_vec = flt_width_vec;
+
+      /* XXX the overflow logic is actually sort of duplicated with trilinear,
+       * since an overflow in one mip should also have a corresponding overflow
+       * in another.
+       */
+      /* should always have normalized coords, and offsets are undefined */
+      assert(bld->static_sampler_state->normalized_coords);
+      coord = lp_build_mul(coord_bld, coords[0], flt_width_vec);
+      /* instead of clamp, build mask if overflowed */
+      coord = lp_build_sub(coord_bld, coord, half);
+      /* convert to int, compute lerp weight */
+      /* not ideal with AVX (and no AVX2) */
+      lp_build_ifloor_fract(coord_bld, coord, &x0, &s_fpart);
+      x1 = lp_build_add(ivec_bld, x0, ivec_bld->one);
+      coord = lp_build_mul(coord_bld, coords[1], flt_height_vec);
+      coord = lp_build_sub(coord_bld, coord, half);
+      lp_build_ifloor_fract(coord_bld, coord, &y0, &t_fpart);
+      y1 = lp_build_add(ivec_bld, y0, ivec_bld->one);
+
+      fall_off[0] = lp_build_cmp(ivec_bld, PIPE_FUNC_LESS, x0, ivec_bld->zero);
+      fall_off[1] = lp_build_cmp(ivec_bld, PIPE_FUNC_GREATER, x1, length_minus_one);
+      fall_off[2] = lp_build_cmp(ivec_bld, PIPE_FUNC_LESS, y0, ivec_bld->zero);
+      fall_off[3] = lp_build_cmp(ivec_bld, PIPE_FUNC_GREATER, y1, length_minus_one);
+
+      fall_off_x = lp_build_or(ivec_bld, fall_off[0], fall_off[1]);
+      fall_off_y = lp_build_or(ivec_bld, fall_off[2], fall_off[3]);
+      have_edge = lp_build_or(ivec_bld, fall_off_x, fall_off_y);
+      have_edge = lp_build_any_true_range(ivec_bld, ivec_bld->type.length, have_edge);
+
+      /* needed for accurate corner filtering branch later, rely on 0 init */
+      int1t = LLVMInt1TypeInContext(bld->gallivm->context);
+      have_corners = lp_build_alloca(bld->gallivm, int1t, "have_corner");
+
+      for (texel_index = 0; texel_index < 4; texel_index++) {
+         xs[texel_index] = lp_build_alloca(bld->gallivm, ivec_bld->vec_type, "xs");
+         ys[texel_index] = lp_build_alloca(bld->gallivm, ivec_bld->vec_type, "ys");
+         zs[texel_index] = lp_build_alloca(bld->gallivm, ivec_bld->vec_type, "zs");
+      }
+
+      lp_build_if(&edge_if, bld->gallivm, have_edge);
+
+      have_corner = lp_build_and(ivec_bld, fall_off_x, fall_off_y);
+      have_corner = lp_build_any_true_range(ivec_bld, ivec_bld->type.length, have_corner);
+      LLVMBuildStore(builder, have_corner, have_corners);
+
+      /*
+       * Need to feed clamped values here for cheap corner handling,
+       * but only for y coord (as when falling off both edges we only
+       * fall off the x one) - this should be sufficient.
+       */
+      y0_clamped = lp_build_max(ivec_bld, y0, ivec_bld->zero);
+      y1_clamped = lp_build_min(ivec_bld, y1, length_minus_one);
+
+      /*
+       * Get all possible new coords.
+       */
+      lp_build_cube_new_coords(ivec_bld, face,
+                               x0, x1, y0_clamped, y1_clamped,
+                               length_minus_one,
+                               new_faces, new_xcoords, new_ycoords);
+
+      /* handle fall off x-, x+ direction */
+      /* determine new coords, face (not both fall_off vars can be true at same time) */
+      x00 = lp_build_select(ivec_bld, fall_off[0], new_xcoords[0][0], x0);
+      y00 = lp_build_select(ivec_bld, fall_off[0], new_ycoords[0][0], y0_clamped);
+      x10 = lp_build_select(ivec_bld, fall_off[0], new_xcoords[0][1], x0);
+      y10 = lp_build_select(ivec_bld, fall_off[0], new_ycoords[0][1], y1_clamped);
+      x01 = lp_build_select(ivec_bld, fall_off[1], new_xcoords[1][0], x1);
+      y01 = lp_build_select(ivec_bld, fall_off[1], new_ycoords[1][0], y0_clamped);
+      x11 = lp_build_select(ivec_bld, fall_off[1], new_xcoords[1][1], x1);
+      y11 = lp_build_select(ivec_bld, fall_off[1], new_ycoords[1][1], y1_clamped);
+
+      z00 = z10 = lp_build_select(ivec_bld, fall_off[0], new_faces[0], face);
+      z01 = z11 = lp_build_select(ivec_bld, fall_off[1], new_faces[1], face);
+
+      /* handle fall off y-, y+ direction */
+      /*
+       * Cheap corner logic: just hack up things so a texel doesn't fall
+       * off both sides (which means filter weights will be wrong but we'll only
+       * use valid texels in the filter).
+       * This means however (y) coords must additionally be clamped (see above).
+       * This corner handling should be fully OpenGL (but not d3d10) compliant.
+       */
+      fall_off_ym_notxm = lp_build_andnot(ivec_bld, fall_off[2], fall_off[0]);
+      fall_off_ym_notxp = lp_build_andnot(ivec_bld, fall_off[2], fall_off[1]);
+      fall_off_yp_notxm = lp_build_andnot(ivec_bld, fall_off[3], fall_off[0]);
+      fall_off_yp_notxp = lp_build_andnot(ivec_bld, fall_off[3], fall_off[1]);
+
+      x00 = lp_build_select(ivec_bld, fall_off_ym_notxm, new_xcoords[2][0], x00);
+      y00 = lp_build_select(ivec_bld, fall_off_ym_notxm, new_ycoords[2][0], y00);
+      x01 = lp_build_select(ivec_bld, fall_off_ym_notxp, new_xcoords[2][1], x01);
+      y01 = lp_build_select(ivec_bld, fall_off_ym_notxp, new_ycoords[2][1], y01);
+      x10 = lp_build_select(ivec_bld, fall_off_yp_notxm, new_xcoords[3][0], x10);
+      y10 = lp_build_select(ivec_bld, fall_off_yp_notxm, new_ycoords[3][0], y10);
+      x11 = lp_build_select(ivec_bld, fall_off_yp_notxp, new_xcoords[3][1], x11);
+      y11 = lp_build_select(ivec_bld, fall_off_yp_notxp, new_ycoords[3][1], y11);
+
+      z00 = lp_build_select(ivec_bld, fall_off_ym_notxm, new_faces[2], z00);
+      z01 = lp_build_select(ivec_bld, fall_off_ym_notxp, new_faces[2], z01);
+      z10 = lp_build_select(ivec_bld, fall_off_yp_notxm, new_faces[3], z10);
+      z11 = lp_build_select(ivec_bld, fall_off_yp_notxp, new_faces[3], z11);
+
+      if (bld->static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) {
+         /* now can add cube layer to face (per sample) */
+         z00 = lp_build_add(ivec_bld, z00, coords[3]);
+         z01 = lp_build_add(ivec_bld, z01, coords[3]);
+         z10 = lp_build_add(ivec_bld, z10, coords[3]);
+         z11 = lp_build_add(ivec_bld, z11, coords[3]);
+      }
+
+      LLVMBuildStore(builder, x00, xs[0]);
+      LLVMBuildStore(builder, x01, xs[1]);
+      LLVMBuildStore(builder, x10, xs[2]);
+      LLVMBuildStore(builder, x11, xs[3]);
+      LLVMBuildStore(builder, y00, ys[0]);
+      LLVMBuildStore(builder, y01, ys[1]);
+      LLVMBuildStore(builder, y10, ys[2]);
+      LLVMBuildStore(builder, y11, ys[3]);
+      LLVMBuildStore(builder, z00, zs[0]);
+      LLVMBuildStore(builder, z01, zs[1]);
+      LLVMBuildStore(builder, z10, zs[2]);
+      LLVMBuildStore(builder, z11, zs[3]);
+
+      lp_build_else(&edge_if);
+
+      LLVMBuildStore(builder, x0, xs[0]);
+      LLVMBuildStore(builder, x1, xs[1]);
+      LLVMBuildStore(builder, x0, xs[2]);
+      LLVMBuildStore(builder, x1, xs[3]);
+      LLVMBuildStore(builder, y0, ys[0]);
+      LLVMBuildStore(builder, y0, ys[1]);
+      LLVMBuildStore(builder, y1, ys[2]);
+      LLVMBuildStore(builder, y1, ys[3]);
+      if (bld->static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) {
+         LLVMValueRef cube_layer = lp_build_add(ivec_bld, face, coords[3]);
+         LLVMBuildStore(builder, cube_layer, zs[0]);
+         LLVMBuildStore(builder, cube_layer, zs[1]);
+         LLVMBuildStore(builder, cube_layer, zs[2]);
+         LLVMBuildStore(builder, cube_layer, zs[3]);
+      }
+      else {
+         LLVMBuildStore(builder, face, zs[0]);
+         LLVMBuildStore(builder, face, zs[1]);
+         LLVMBuildStore(builder, face, zs[2]);
+         LLVMBuildStore(builder, face, zs[3]);
+      }
+
+      lp_build_endif(&edge_if);
+
+      x00 = LLVMBuildLoad(builder, xs[0], "");
+      x01 = LLVMBuildLoad(builder, xs[1], "");
+      x10 = LLVMBuildLoad(builder, xs[2], "");
+      x11 = LLVMBuildLoad(builder, xs[3], "");
+      y00 = LLVMBuildLoad(builder, ys[0], "");
+      y01 = LLVMBuildLoad(builder, ys[1], "");
+      y10 = LLVMBuildLoad(builder, ys[2], "");
+      y11 = LLVMBuildLoad(builder, ys[3], "");
+      z00 = LLVMBuildLoad(builder, zs[0], "");
+      z01 = LLVMBuildLoad(builder, zs[1], "");
+      z10 = LLVMBuildLoad(builder, zs[2], "");
+      z11 = LLVMBuildLoad(builder, zs[3], "");
+   }
+
+   if (linear_mask) {
+      /*
+       * Whack filter weights into place. Whatever texel had more weight is
+       * the one which should have been selected by nearest filtering hence
+       * just use 100% weight for it.
+       */
+      struct lp_build_context *c_bld = &bld->coord_bld;
+      LLVMValueRef w1_mask, w1_weight;
+      LLVMValueRef half = lp_build_const_vec(bld->gallivm, c_bld->type, 0.5f);
+
+      w1_mask = lp_build_cmp(c_bld, PIPE_FUNC_GREATER, s_fpart, half);
+      /* this select is really just a "and" */
+      w1_weight = lp_build_select(c_bld, w1_mask, c_bld->one, c_bld->zero);
+      s_fpart = lp_build_select(c_bld, linear_mask, s_fpart, w1_weight);
+      if (dims >= 2) {
+         w1_mask = lp_build_cmp(c_bld, PIPE_FUNC_GREATER, t_fpart, half);
+         w1_weight = lp_build_select(c_bld, w1_mask, c_bld->one, c_bld->zero);
+         t_fpart = lp_build_select(c_bld, linear_mask, t_fpart, w1_weight);
+         if (dims == 3) {
+            w1_mask = lp_build_cmp(c_bld, PIPE_FUNC_GREATER, r_fpart, half);
+            w1_weight = lp_build_select(c_bld, w1_mask, c_bld->one, c_bld->zero);
+            r_fpart = lp_build_select(c_bld, linear_mask, r_fpart, w1_weight);
+         }
+      }
+   }
+
+   /*
+    * Get texture colors.
+    */
+   /* get x0/x1 texels */
+   lp_build_sample_texel_soa(bld,
+                             width_vec, height_vec, depth_vec,
+                             x00, y00, z00,
+                             row_stride_vec, img_stride_vec,
+                             data_ptr, mipoffsets, neighbors[0][0]);
+   lp_build_sample_texel_soa(bld,
+                             width_vec, height_vec, depth_vec,
+                             x01, y01, z01,
+                             row_stride_vec, img_stride_vec,
+                             data_ptr, mipoffsets, neighbors[0][1]);
+
+   if (dims == 1) {
+      assert(!is_gather);
+      if (bld->static_sampler_state->compare_mode == PIPE_TEX_COMPARE_NONE) {
+         /* Interpolate two samples from 1D image to produce one color */
+         for (chan = 0; chan < 4; chan++) {
+            colors_out[chan] = lp_build_lerp(texel_bld, s_fpart,
+                                             neighbors[0][0][chan],
+                                             neighbors[0][1][chan],
+                                             0);
+         }
+      }
+      else {
+         LLVMValueRef cmpval0, cmpval1;
+         cmpval0 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][0][0]);
+         cmpval1 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][1][0]);
+         /* simplified lerp, AND mask with weight and add */
+         colors_out[0] = lp_build_masklerp(texel_bld, s_fpart,
+                                           cmpval0, cmpval1);
+         colors_out[1] = colors_out[2] = colors_out[3] = colors_out[0];
+      }
+   }
+   else {
+      /* 2D/3D texture */
+      struct lp_build_if_state corner_if;
+      LLVMValueRef colors0[4], colorss[4];
+
+      /* get x0/x1 texels at y1 */
+      lp_build_sample_texel_soa(bld,
+                                width_vec, height_vec, depth_vec,
+                                x10, y10, z10,
+                                row_stride_vec, img_stride_vec,
+                                data_ptr, mipoffsets, neighbors[1][0]);
+      lp_build_sample_texel_soa(bld,
+                                width_vec, height_vec, depth_vec,
+                                x11, y11, z11,
+                                row_stride_vec, img_stride_vec,
+                                data_ptr, mipoffsets, neighbors[1][1]);
+
+      /*
+       * To avoid having to duplicate linear_mask / fetch code use
+       * another branch (with corner condition though edge would work
+       * as well) here.
+       */
+      if (accurate_cube_corners) {
+         LLVMValueRef w00, w01, w10, w11, wx0, wy0;
+         LLVMValueRef c_weight, c00, c01, c10, c11;
+         LLVMValueRef have_corner, one_third, tmp;
+
+         colorss[0] = lp_build_alloca(bld->gallivm, coord_bld->vec_type, "cs");
+         colorss[1] = lp_build_alloca(bld->gallivm, coord_bld->vec_type, "cs");
+         colorss[2] = lp_build_alloca(bld->gallivm, coord_bld->vec_type, "cs");
+         colorss[3] = lp_build_alloca(bld->gallivm, coord_bld->vec_type, "cs");
+
+         have_corner = LLVMBuildLoad(builder, have_corners, "");
+
+         lp_build_if(&corner_if, bld->gallivm, have_corner);
+
+         /*
+          * we can't use standard 2d lerp as we need per-element weight
+          * in case of corners, so just calculate bilinear result as
+          * w00*s00 + w01*s01 + w10*s10 + w11*s11.
+          * (This is actually less work than using 2d lerp, 7 vs. 9 instructions,
+          * however calculating the weights needs another 6, so actually probably
+          * not slower than 2d lerp only for 4 channels as weights only need
+          * to be calculated once - of course fixing the weights has additional cost.)
+          */
+         wx0 = lp_build_sub(coord_bld, coord_bld->one, s_fpart);
+         wy0 = lp_build_sub(coord_bld, coord_bld->one, t_fpart);
+         w00 = lp_build_mul(coord_bld, wx0, wy0);
+         w01 = lp_build_mul(coord_bld, s_fpart, wy0);
+         w10 = lp_build_mul(coord_bld, wx0, t_fpart);
+         w11 = lp_build_mul(coord_bld, s_fpart, t_fpart);
+
+         /* find corner weight */
+         c00 = lp_build_and(ivec_bld, fall_off[0], fall_off[2]);
+         c_weight = lp_build_select(coord_bld, c00, w00, coord_bld->zero);
+         c01 = lp_build_and(ivec_bld, fall_off[1], fall_off[2]);
+         c_weight = lp_build_select(coord_bld, c01, w01, c_weight);
+         c10 = lp_build_and(ivec_bld, fall_off[0], fall_off[3]);
+         c_weight = lp_build_select(coord_bld, c10, w10, c_weight);
+         c11 = lp_build_and(ivec_bld, fall_off[1], fall_off[3]);
+         c_weight = lp_build_select(coord_bld, c11, w11, c_weight);
+
+         /*
+          * add 1/3 of the corner weight to each of the 3 other samples
+          * and null out corner weight
+          */
+         one_third = lp_build_const_vec(bld->gallivm, coord_bld->type, 1.0f/3.0f);
+         c_weight = lp_build_mul(coord_bld, c_weight, one_third);
+         w00 = lp_build_add(coord_bld, w00, c_weight);
+         c00 = LLVMBuildBitCast(builder, c00, coord_bld->vec_type, "");
+         w00 = lp_build_andnot(coord_bld, w00, c00);
+         w01 = lp_build_add(coord_bld, w01, c_weight);
+         c01 = LLVMBuildBitCast(builder, c01, coord_bld->vec_type, "");
+         w01 = lp_build_andnot(coord_bld, w01, c01);
+         w10 = lp_build_add(coord_bld, w10, c_weight);
+         c10 = LLVMBuildBitCast(builder, c10, coord_bld->vec_type, "");
+         w10 = lp_build_andnot(coord_bld, w10, c10);
+         w11 = lp_build_add(coord_bld, w11, c_weight);
+         c11 = LLVMBuildBitCast(builder, c11, coord_bld->vec_type, "");
+         w11 = lp_build_andnot(coord_bld, w11, c11);
+
+         if (bld->static_sampler_state->compare_mode == PIPE_TEX_COMPARE_NONE) {
+            for (chan = 0; chan < 4; chan++) {
+               colors0[chan] = lp_build_mul(coord_bld, w00, neighbors[0][0][chan]);
+               tmp = lp_build_mul(coord_bld, w01, neighbors[0][1][chan]);
+               colors0[chan] = lp_build_add(coord_bld, tmp, colors0[chan]);
+               tmp = lp_build_mul(coord_bld, w10, neighbors[1][0][chan]);
+               colors0[chan] = lp_build_add(coord_bld, tmp, colors0[chan]);
+               tmp = lp_build_mul(coord_bld, w11, neighbors[1][1][chan]);
+               colors0[chan] = lp_build_add(coord_bld, tmp, colors0[chan]);
+            }
+         }
+         else {
+            LLVMValueRef cmpval00, cmpval01, cmpval10, cmpval11;
+            cmpval00 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][0][0]);
+            cmpval01 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][1][0]);
+            cmpval10 = lp_build_sample_comparefunc(bld, coords[4], neighbors[1][0][0]);
+            cmpval11 = lp_build_sample_comparefunc(bld, coords[4], neighbors[1][1][0]);
+            /* inputs to interpolation are just masks so just add masked weights together */
+            cmpval00 = LLVMBuildBitCast(builder, cmpval00, coord_bld->vec_type, "");
+            cmpval01 = LLVMBuildBitCast(builder, cmpval01, coord_bld->vec_type, "");
+            cmpval10 = LLVMBuildBitCast(builder, cmpval10, coord_bld->vec_type, "");
+            cmpval11 = LLVMBuildBitCast(builder, cmpval11, coord_bld->vec_type, "");
+            colors0[0] = lp_build_and(coord_bld, w00, cmpval00);
+            tmp = lp_build_and(coord_bld, w01, cmpval01);
+            colors0[0] = lp_build_add(coord_bld, tmp, colors0[0]);
+            tmp = lp_build_and(coord_bld, w10, cmpval10);
+            colors0[0] = lp_build_add(coord_bld, tmp, colors0[0]);
+            tmp = lp_build_and(coord_bld, w11, cmpval11);
+            colors0[0] = lp_build_add(coord_bld, tmp, colors0[0]);
+            colors0[1] = colors0[2] = colors0[3] = colors0[0];
+         }
+
+         LLVMBuildStore(builder, colors0[0], colorss[0]);
+         LLVMBuildStore(builder, colors0[1], colorss[1]);
+         LLVMBuildStore(builder, colors0[2], colorss[2]);
+         LLVMBuildStore(builder, colors0[3], colorss[3]);
+
+         lp_build_else(&corner_if);
+      }
+
+      if (bld->static_sampler_state->compare_mode == PIPE_TEX_COMPARE_NONE) {
+         if (is_gather) {
+            /*
+             * Just assign the red channel (no component selection yet).
+             * This is a bit hackish, we usually do the swizzle at the
+             * end of sampling (much less values to swizzle), but this
+             * obviously cannot work when using gather.
+             */
+            unsigned chan_swiz = bld->static_texture_state->swizzle_r;
+            colors0[0] = lp_build_swizzle_soa_channel(texel_bld,
+                                                      neighbors[1][0],
+                                                      chan_swiz);
+            colors0[1] = lp_build_swizzle_soa_channel(texel_bld,
+                                                      neighbors[1][1],
+                                                      chan_swiz);
+            colors0[2] = lp_build_swizzle_soa_channel(texel_bld,
+                                                      neighbors[0][1],
+                                                      chan_swiz);
+            colors0[3] = lp_build_swizzle_soa_channel(texel_bld,
+                                                      neighbors[0][0],
+                                                      chan_swiz);
+         }
+         else {
+            /* Bilinear interpolate the four samples from the 2D image / 3D slice */
+            for (chan = 0; chan < 4; chan++) {
+               colors0[chan] = lp_build_lerp_2d(texel_bld,
+                                                s_fpart, t_fpart,
+                                                neighbors[0][0][chan],
+                                                neighbors[0][1][chan],
+                                                neighbors[1][0][chan],
+                                                neighbors[1][1][chan],
+                                                0);
+            }
+         }
+      }
+      else {
+         LLVMValueRef cmpval00, cmpval01, cmpval10, cmpval11;
+         cmpval00 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][0][0]);
+         cmpval01 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][1][0]);
+         cmpval10 = lp_build_sample_comparefunc(bld, coords[4], neighbors[1][0][0]);
+         cmpval11 = lp_build_sample_comparefunc(bld, coords[4], neighbors[1][1][0]);
+
+         if (is_gather) {
+            /* more hacks for swizzling, should be X, ONE or ZERO... */
+            unsigned chan_swiz = bld->static_texture_state->swizzle_r;
+            if (chan_swiz <= PIPE_SWIZZLE_ALPHA) {
+               colors0[0] = lp_build_select(texel_bld, cmpval10,
+                                            texel_bld->one, texel_bld->zero);
+               colors0[1] = lp_build_select(texel_bld, cmpval11,
+                                            texel_bld->one, texel_bld->zero);
+               colors0[2] = lp_build_select(texel_bld, cmpval01,
+                                            texel_bld->one, texel_bld->zero);
+               colors0[3] = lp_build_select(texel_bld, cmpval00,
+                                            texel_bld->one, texel_bld->zero);
+            }
+            else if (chan_swiz == PIPE_SWIZZLE_ZERO) {
+               colors0[0] = colors0[1] = colors0[2] = colors0[3] =
+                            texel_bld->zero;
+            }
+            else {
+               colors0[0] = colors0[1] = colors0[2] = colors0[3] =
+                            texel_bld->one;
+            }
+         }
+         else {
+            colors0[0] = lp_build_masklerp2d(texel_bld, s_fpart, t_fpart,
+                                             cmpval00, cmpval01, cmpval10, cmpval11);
+            colors0[1] = colors0[2] = colors0[3] = colors0[0];
+         }
+      }
+
+      if (accurate_cube_corners) {
+         LLVMBuildStore(builder, colors0[0], colorss[0]);
+         LLVMBuildStore(builder, colors0[1], colorss[1]);
+         LLVMBuildStore(builder, colors0[2], colorss[2]);
+         LLVMBuildStore(builder, colors0[3], colorss[3]);
+
+         lp_build_endif(&corner_if);
+
+         colors0[0] = LLVMBuildLoad(builder, colorss[0], "");
+         colors0[1] = LLVMBuildLoad(builder, colorss[1], "");
+         colors0[2] = LLVMBuildLoad(builder, colorss[2], "");
+         colors0[3] = LLVMBuildLoad(builder, colorss[3], "");
+      }
+
+      if (dims == 3) {
+         LLVMValueRef neighbors1[2][2][4];
+         LLVMValueRef colors1[4];
+
+         assert(!is_gather);
+
+         /* get x0/x1/y0/y1 texels at z1 */
+         lp_build_sample_texel_soa(bld,
+                                   width_vec, height_vec, depth_vec,
+                                   x00, y00, z1,
+                                   row_stride_vec, img_stride_vec,
+                                   data_ptr, mipoffsets, neighbors1[0][0]);
+         lp_build_sample_texel_soa(bld,
+                                   width_vec, height_vec, depth_vec,
+                                   x01, y01, z1,
+                                   row_stride_vec, img_stride_vec,
+                                   data_ptr, mipoffsets, neighbors1[0][1]);
+         lp_build_sample_texel_soa(bld,
+                                   width_vec, height_vec, depth_vec,
+                                   x10, y10, z1,
+                                   row_stride_vec, img_stride_vec,
+                                   data_ptr, mipoffsets, neighbors1[1][0]);
+         lp_build_sample_texel_soa(bld,
+                                   width_vec, height_vec, depth_vec,
+                                   x11, y11, z1,
+                                   row_stride_vec, img_stride_vec,
+                                   data_ptr, mipoffsets, neighbors1[1][1]);
+
+         if (bld->static_sampler_state->compare_mode == PIPE_TEX_COMPARE_NONE) {
+            /* Bilinear interpolate the four samples from the second Z slice */
+            for (chan = 0; chan < 4; chan++) {
+               colors1[chan] = lp_build_lerp_2d(texel_bld,
+                                                s_fpart, t_fpart,
+                                                neighbors1[0][0][chan],
+                                                neighbors1[0][1][chan],
+                                                neighbors1[1][0][chan],
+                                                neighbors1[1][1][chan],
+                                                0);
+            }
+            /* Linearly interpolate the two samples from the two 3D slices */
+            for (chan = 0; chan < 4; chan++) {
+               colors_out[chan] = lp_build_lerp(texel_bld,
+                                                r_fpart,
+                                                colors0[chan], colors1[chan],
+                                                0);
+            }
+         }
+         else {
+            LLVMValueRef cmpval00, cmpval01, cmpval10, cmpval11;
+            cmpval00 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][0][0]);
+            cmpval01 = lp_build_sample_comparefunc(bld, coords[4], neighbors[0][1][0]);
+            cmpval10 = lp_build_sample_comparefunc(bld, coords[4], neighbors[1][0][0]);
+            cmpval11 = lp_build_sample_comparefunc(bld, coords[4], neighbors[1][1][0]);
+            colors1[0] = lp_build_masklerp2d(texel_bld, s_fpart, t_fpart,
+                                             cmpval00, cmpval01, cmpval10, cmpval11);
+            /* Linearly interpolate the two samples from the two 3D slices */
+            colors_out[0] = lp_build_lerp(texel_bld,
+                                          r_fpart,
+                                          colors0[0], colors1[0],
+                                          0);
+            colors_out[1] = colors_out[2] = colors_out[3] = colors_out[0];
+         }
+      }
+      else {
+         /* 2D tex */
+         for (chan = 0; chan < 4; chan++) {
+            colors_out[chan] = colors0[chan];
+         }
+      }
+   }
+}
+
+
+/**
+ * Sample the texture/mipmap using given image filter and mip filter.
+ * ilevel0 and ilevel1 indicate the two mipmap levels to sample
+ * from (vectors or scalars).
+ * If we're using nearest miplevel sampling the '1' values will be null/unused.
+ */
+static void
+lp_build_sample_mipmap(struct lp_build_sample_context *bld,
+                       unsigned img_filter,
+                       unsigned mip_filter,
+                       boolean is_gather,
+                       LLVMValueRef *coords,
+                       const LLVMValueRef *offsets,
+                       LLVMValueRef ilevel0,
+                       LLVMValueRef ilevel1,
+                       LLVMValueRef lod_fpart,
+                       LLVMValueRef *colors_out)
+{
+   LLVMBuilderRef builder = bld->gallivm->builder;
+   LLVMValueRef size0 = NULL;
+   LLVMValueRef size1 = NULL;
+   LLVMValueRef row_stride0_vec = NULL;
+   LLVMValueRef row_stride1_vec = NULL;
+   LLVMValueRef img_stride0_vec = NULL;
+   LLVMValueRef img_stride1_vec = NULL;
+   LLVMValueRef data_ptr0 = NULL;
+   LLVMValueRef data_ptr1 = NULL;
+   LLVMValueRef mipoff0 = NULL;
+   LLVMValueRef mipoff1 = NULL;
+   LLVMValueRef colors0[4], colors1[4];
+   unsigned chan;
+
+   /* sample the first mipmap level */
+   lp_build_mipmap_level_sizes(bld, ilevel0,
+                               &size0,
+                               &row_stride0_vec, &img_stride0_vec);
+   if (bld->num_mips == 1) {
+      data_ptr0 = lp_build_get_mipmap_level(bld, ilevel0);
+   }
+   else {
+      /* This path should work for num_lods 1 too but slightly less efficient */
+      data_ptr0 = bld->base_ptr;
+      mipoff0 = lp_build_get_mip_offsets(bld, ilevel0);
+   }
+   if (img_filter == PIPE_TEX_FILTER_NEAREST) {
+      lp_build_sample_image_nearest(bld, size0,
+                                    row_stride0_vec, img_stride0_vec,
+                                    data_ptr0, mipoff0, coords, offsets,
+                                    colors0);
+   }
+   else {
+      assert(img_filter == PIPE_TEX_FILTER_LINEAR);
+      lp_build_sample_image_linear(bld, is_gather, size0, NULL,
+                                   row_stride0_vec, img_stride0_vec,
+                                   data_ptr0, mipoff0, coords, offsets,
+                                   colors0);
+   }
+
+   /* Store the first level's colors in the output variables */
+   for (chan = 0; chan < 4; chan++) {
+       LLVMBuildStore(builder, colors0[chan], colors_out[chan]);
+   }
+
+   if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
+      struct lp_build_if_state if_ctx;
+      LLVMValueRef need_lerp;
+
+      /* need_lerp = lod_fpart > 0 */
+      if (bld->num_lods == 1) {
+         need_lerp = LLVMBuildFCmp(builder, LLVMRealUGT,
+                                   lod_fpart, bld->lodf_bld.zero,
+                                   "need_lerp");
+      }
+      else {
+         /*
+          * We'll do mip filtering if any of the quads (or individual
+          * pixel in case of per-pixel lod) need it.
+          * It might be better to split the vectors here and only fetch/filter
+          * quads which need it (if there's one lod per quad).
+          */
+         need_lerp = lp_build_compare(bld->gallivm, bld->lodf_bld.type,
+                                      PIPE_FUNC_GREATER,
+                                      lod_fpart, bld->lodf_bld.zero);
+         need_lerp = lp_build_any_true_range(&bld->lodi_bld, bld->num_lods, need_lerp);
+      }
+
+      lp_build_if(&if_ctx, bld->gallivm, need_lerp);
+      {
+         /*
+          * We unfortunately need to clamp lod_fpart here since we can get
+          * negative values which would screw up filtering if not all
+          * lod_fpart values have same sign.
+          */
+         lod_fpart = lp_build_max(&bld->lodf_bld, lod_fpart,
+                                  bld->lodf_bld.zero);
+         /* sample the second mipmap level */
+         lp_build_mipmap_level_sizes(bld, ilevel1,
+                                     &size1,
+                                     &row_stride1_vec, &img_stride1_vec);
+         if (bld->num_mips == 1) {
+            data_ptr1 = lp_build_get_mipmap_level(bld, ilevel1);
+         }
+         else {
+            data_ptr1 = bld->base_ptr;
+            mipoff1 = lp_build_get_mip_offsets(bld, ilevel1);
+         }
+         if (img_filter == PIPE_TEX_FILTER_NEAREST) {
+            lp_build_sample_image_nearest(bld, size1,
+                                          row_stride1_vec, img_stride1_vec,
+                                          data_ptr1, mipoff1, coords, offsets,
+                                          colors1);
+         }
+         else {
+            lp_build_sample_image_linear(bld, FALSE, size1, NULL,
+                                         row_stride1_vec, img_stride1_vec,
+                                         data_ptr1, mipoff1, coords, offsets,
+                                         colors1);
+         }
+
+         /* interpolate samples from the two mipmap levels */
+
+         if (bld->num_lods != bld->coord_type.length)
+            lod_fpart = lp_build_unpack_broadcast_aos_scalars(bld->gallivm,
+                                                              bld->lodf_bld.type,
+                                                              bld->texel_bld.type,
+                                                              lod_fpart);
+
+         for (chan = 0; chan < 4; chan++) {
+            colors0[chan] = lp_build_lerp(&bld->texel_bld, lod_fpart,
+                                          colors0[chan], colors1[chan],
+                                          0);
+            LLVMBuildStore(builder, colors0[chan], colors_out[chan]);
+         }
+      }
+      lp_build_endif(&if_ctx);
+   }
+}
+
+
+/**
+ * Sample the texture/mipmap using given mip filter, and using
+ * both nearest and linear filtering at the same time depending
+ * on linear_mask.
+ * lod can be per quad but linear_mask is always per pixel.
+ * ilevel0 and ilevel1 indicate the two mipmap levels to sample
+ * from (vectors or scalars).
+ * If we're using nearest miplevel sampling the '1' values will be null/unused.
+ */
+static void
+lp_build_sample_mipmap_both(struct lp_build_sample_context *bld,
+                            LLVMValueRef linear_mask,
+                            unsigned mip_filter,
+                            LLVMValueRef *coords,
+                            const LLVMValueRef *offsets,
+                            LLVMValueRef ilevel0,
+                            LLVMValueRef ilevel1,
+                            LLVMValueRef lod_fpart,
+                            LLVMValueRef lod_positive,
+                            LLVMValueRef *colors_out)
+{
+   LLVMBuilderRef builder = bld->gallivm->builder;
+   LLVMValueRef size0 = NULL;
+   LLVMValueRef size1 = NULL;
+   LLVMValueRef row_stride0_vec = NULL;
+   LLVMValueRef row_stride1_vec = NULL;
+   LLVMValueRef img_stride0_vec = NULL;
+   LLVMValueRef img_stride1_vec = NULL;
+   LLVMValueRef data_ptr0 = NULL;
+   LLVMValueRef data_ptr1 = NULL;
+   LLVMValueRef mipoff0 = NULL;
+   LLVMValueRef mipoff1 = NULL;
+   LLVMValueRef colors0[4], colors1[4];
+   unsigned chan;
+
+   /* sample the first mipmap level */
+   lp_build_mipmap_level_sizes(bld, ilevel0,
+                               &size0,
+                               &row_stride0_vec, &img_stride0_vec);
+   if (bld->num_mips == 1) {
+      data_ptr0 = lp_build_get_mipmap_level(bld, ilevel0);
+   }
+   else {
+      /* This path should work for num_lods 1 too but slightly less efficient */
+      data_ptr0 = bld->base_ptr;
+      mipoff0 = lp_build_get_mip_offsets(bld, ilevel0);
+   }
+
+   lp_build_sample_image_linear(bld, FALSE, size0, linear_mask,
+                                row_stride0_vec, img_stride0_vec,
+                                data_ptr0, mipoff0, coords, offsets,
+                                colors0);
+
+   /* Store the first level's colors in the output variables */
+   for (chan = 0; chan < 4; chan++) {
+       LLVMBuildStore(builder, colors0[chan], colors_out[chan]);
+   }
+
+   if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
+      struct lp_build_if_state if_ctx;
+      LLVMValueRef need_lerp;
+
+      /*
+       * We'll do mip filtering if any of the quads (or individual
+       * pixel in case of per-pixel lod) need it.
+       * Note using lod_positive here not lod_fpart since it may be the same
+       * condition as that used in the outer "if" in the caller hence llvm
+       * should be able to merge the branches in this case.
+       */
+      need_lerp = lp_build_any_true_range(&bld->lodi_bld, bld->num_lods, lod_positive);
+
+      lp_build_if(&if_ctx, bld->gallivm, need_lerp);
+      {
+         /*
+          * We unfortunately need to clamp lod_fpart here since we can get
+          * negative values which would screw up filtering if not all
+          * lod_fpart values have same sign.
+          */
+         lod_fpart = lp_build_max(&bld->lodf_bld, lod_fpart,
+                                  bld->lodf_bld.zero);
+         /* sample the second mipmap level */
+         lp_build_mipmap_level_sizes(bld, ilevel1,
+                                     &size1,
+                                     &row_stride1_vec, &img_stride1_vec);
+         if (bld->num_mips == 1) {
+            data_ptr1 = lp_build_get_mipmap_level(bld, ilevel1);
+         }
+         else {
+            data_ptr1 = bld->base_ptr;
+            mipoff1 = lp_build_get_mip_offsets(bld, ilevel1);
+         }
+
+         lp_build_sample_image_linear(bld, FALSE, size1, linear_mask,
+                                      row_stride1_vec, img_stride1_vec,
+                                      data_ptr1, mipoff1, coords, offsets,
+                                      colors1);
+
+         /* interpolate samples from the two mipmap levels */
+
+         if (bld->num_lods != bld->coord_type.length)
+            lod_fpart = lp_build_unpack_broadcast_aos_scalars(bld->gallivm,
+                                                              bld->lodf_bld.type,
+                                                              bld->texel_bld.type,
+                                                              lod_fpart);
+
+         for (chan = 0; chan < 4; chan++) {
+            colors0[chan] = lp_build_lerp(&bld->texel_bld, lod_fpart,
+                                          colors0[chan], colors1[chan],
+                                          0);
+            LLVMBuildStore(builder, colors0[chan], colors_out[chan]);
+         }
+      }
+      lp_build_endif(&if_ctx);
+   }
+}
+
+
+/**
+ * Build (per-coord) layer value.
+ * Either clamp layer to valid values or fill in optional out_of_bounds
+ * value and just return value unclamped.
+ */
+static LLVMValueRef
+lp_build_layer_coord(struct lp_build_sample_context *bld,
+                     unsigned texture_unit,
+                     boolean is_cube_array,
+                     LLVMValueRef layer,
+                     LLVMValueRef *out_of_bounds)
+{
+   LLVMValueRef num_layers;
+   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+
+   num_layers = bld->dynamic_state->depth(bld->dynamic_state, bld->gallivm,
+                                          bld->context_ptr, texture_unit);
+
+   if (out_of_bounds) {
+      LLVMValueRef out1, out;
+      assert(!is_cube_array);
+      num_layers = lp_build_broadcast_scalar(int_coord_bld, num_layers);
+      out = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, layer, int_coord_bld->zero);
+      out1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, layer, num_layers);
+      *out_of_bounds = lp_build_or(int_coord_bld, out, out1);
+      return layer;
+   }
+   else {
+      LLVMValueRef maxlayer;
+      LLVMValueRef s = is_cube_array ? lp_build_const_int32(bld->gallivm, 6) :
+                                       bld->int_bld.one;
+      maxlayer = lp_build_sub(&bld->int_bld, num_layers, s);
+      maxlayer = lp_build_broadcast_scalar(int_coord_bld, maxlayer);
+      return lp_build_clamp(int_coord_bld, layer, int_coord_bld->zero, maxlayer);
+   }
+}
+
+
+/**
+ * Calculate cube face, lod, mip levels.
+ */
+static void
+lp_build_sample_common(struct lp_build_sample_context *bld,
+                       unsigned texture_index,
+                       unsigned sampler_index,
+                       LLVMValueRef *coords,
+                       const struct lp_derivatives *derivs, /* optional */
+                       LLVMValueRef lod_bias, /* optional */
+                       LLVMValueRef explicit_lod, /* optional */
+                       LLVMValueRef *lod_pos_or_zero,
+                       LLVMValueRef *lod_fpart,
+                       LLVMValueRef *ilevel0,
+                       LLVMValueRef *ilevel1)
+{
+   const unsigned mip_filter = bld->static_sampler_state->min_mip_filter;
+   const unsigned min_filter = bld->static_sampler_state->min_img_filter;
+   const unsigned mag_filter = bld->static_sampler_state->mag_img_filter;
+   const unsigned target = bld->static_texture_state->target;
+   LLVMValueRef first_level, cube_rho = NULL;
+   LLVMValueRef lod_ipart = NULL;
+   struct lp_derivatives cube_derivs;
+
+   /*
+   printf("%s mip %d  min %d  mag %d\n", __FUNCTION__,
+          mip_filter, min_filter, mag_filter);
+   */
+
+   /*
+    * Choose cube face, recompute texcoords for the chosen face and
+    * compute rho here too (as it requires transform of derivatives).
+    */
+   if (target == PIPE_TEXTURE_CUBE || target == PIPE_TEXTURE_CUBE_ARRAY) {
+      boolean need_derivs;
+      need_derivs = ((min_filter != mag_filter ||
+                      mip_filter != PIPE_TEX_MIPFILTER_NONE) &&
+                      !bld->static_sampler_state->min_max_lod_equal &&
+                      !explicit_lod);
+      lp_build_cube_lookup(bld, coords, derivs, &cube_rho, &cube_derivs, need_derivs);
+      derivs = &cube_derivs;
+      if (target == PIPE_TEXTURE_CUBE_ARRAY) {
+         /* calculate cube layer coord now */
+         LLVMValueRef layer = lp_build_iround(&bld->coord_bld, coords[3]);
+         LLVMValueRef six = lp_build_const_int_vec(bld->gallivm, bld->int_coord_type, 6);
+         layer = lp_build_mul(&bld->int_coord_bld, layer, six);
+         coords[3] = lp_build_layer_coord(bld, texture_index, TRUE, layer, NULL);
+         /* because of seamless filtering can't add it to face (coords[2]) here. */
+      }
+   }
+   else if (target == PIPE_TEXTURE_1D_ARRAY ||
+            target == PIPE_TEXTURE_2D_ARRAY) {
+      coords[2] = lp_build_iround(&bld->coord_bld, coords[2]);
+      coords[2] = lp_build_layer_coord(bld, texture_index, FALSE, coords[2], NULL);
+   }
+
+   if (bld->static_sampler_state->compare_mode != PIPE_TEX_COMPARE_NONE) {
+      /*
+       * Clamp p coords to [0,1] for fixed function depth texture format here.
+       * Technically this is not entirely correct for unorm depth as the ref value
+       * should be converted to the depth format (quantization!) and comparison
+       * then done in texture format. This would actually help performance (since
+       * only need to do it once and could save the per-sample conversion of texels
+       * to floats instead), but it would need more messy code (would need to push
+       * at least some bits down to actual fetch so conversion could be skipped,
+       * and would have ugly interaction with border color, would need to convert
+       * border color to that format too or do some other tricks to make it work).
+       */
+      const struct util_format_description *format_desc = bld->format_desc;
+      unsigned chan_type;
+      /* not entirely sure we couldn't end up with non-valid swizzle here */
+      chan_type = format_desc->swizzle[0] <= UTIL_FORMAT_SWIZZLE_W ?
+                     format_desc->channel[format_desc->swizzle[0]].type :
+                     UTIL_FORMAT_TYPE_FLOAT;
+      if (chan_type != UTIL_FORMAT_TYPE_FLOAT) {
+         coords[4] = lp_build_clamp(&bld->coord_bld, coords[4],
+                                    bld->coord_bld.zero, bld->coord_bld.one);
+      }
+   }
+
+   /*
+    * Compute the level of detail (float).
+    */
+   if (min_filter != mag_filter ||
+       mip_filter != PIPE_TEX_MIPFILTER_NONE) {
+      /* Need to compute lod either to choose mipmap levels or to
+       * distinguish between minification/magnification with one mipmap level.
+       */
+      lp_build_lod_selector(bld, texture_index, sampler_index,
+                            coords[0], coords[1], coords[2], cube_rho,
+                            derivs, lod_bias, explicit_lod,
+                            mip_filter,
+                            &lod_ipart, lod_fpart, lod_pos_or_zero);
+   } else {
+      lod_ipart = bld->lodi_bld.zero;
+      *lod_pos_or_zero = bld->lodi_bld.zero;
+   }
+
+   if (bld->num_lods != bld->num_mips) {
+      /* only makes sense if there's just a single mip level */
+      assert(bld->num_mips == 1);
+      lod_ipart = lp_build_extract_range(bld->gallivm, lod_ipart, 0, 1);
+   }
+
+   /*
+    * Compute integer mipmap level(s) to fetch texels from: ilevel0, ilevel1
+    */
+   switch (mip_filter) {
+   default:
+      assert(0 && "bad mip_filter value in lp_build_sample_soa()");
+      /* fall-through */
+   case PIPE_TEX_MIPFILTER_NONE:
+      /* always use mip level 0 */
+      first_level = bld->dynamic_state->first_level(bld->dynamic_state,
+                                                    bld->gallivm, bld->context_ptr,
+                                                    texture_index);
+      first_level = lp_build_broadcast_scalar(&bld->leveli_bld, first_level);
+      *ilevel0 = first_level;
+      break;
+   case PIPE_TEX_MIPFILTER_NEAREST:
+      assert(lod_ipart);
+      lp_build_nearest_mip_level(bld, texture_index, lod_ipart, ilevel0, NULL);
+      break;
+   case PIPE_TEX_MIPFILTER_LINEAR:
+      assert(lod_ipart);
+      assert(*lod_fpart);
+      lp_build_linear_mip_levels(bld, texture_index,
+                                 lod_ipart, lod_fpart,
+                                 ilevel0, ilevel1);
+      break;
+   }
+}
+
+static void
+lp_build_clamp_border_color(struct lp_build_sample_context *bld,
+                            unsigned sampler_unit)
+{
+   struct gallivm_state *gallivm = bld->gallivm;
+   LLVMBuilderRef builder = gallivm->builder;
+   LLVMValueRef border_color_ptr =
+      bld->dynamic_state->border_color(bld->dynamic_state, gallivm,
+                                       bld->context_ptr, sampler_unit);
+   LLVMValueRef border_color;
+   const struct util_format_description *format_desc = bld->format_desc;
+   struct lp_type vec4_type = bld->texel_type;
+   struct lp_build_context vec4_bld;
+   LLVMValueRef min_clamp = NULL;
+   LLVMValueRef max_clamp = NULL;
+
+   /*
+    * For normalized format need to clamp border color (technically
+    * probably should also quantize the data). Really sucks doing this
+    * here but can't avoid at least for now since this is part of
+    * sampler state and texture format is part of sampler_view state.
+    * GL expects also expects clamping for uint/sint formats too so
+    * do that as well (d3d10 can't end up here with uint/sint since it
+    * only supports them with ld).
+    */
+   vec4_type.length = 4;
+   lp_build_context_init(&vec4_bld, gallivm, vec4_type);
+
+   /*
+    * Vectorized clamping of border color. Loading is a bit of a hack since
+    * we just cast the pointer to float array to pointer to vec4
+    * (int or float).
+    */
+   border_color_ptr = lp_build_array_get_ptr(gallivm, border_color_ptr,
+                                             lp_build_const_int32(gallivm, 0));
+   border_color_ptr = LLVMBuildBitCast(builder, border_color_ptr,
+                                       LLVMPointerType(vec4_bld.vec_type, 0), "");
+   border_color = LLVMBuildLoad(builder, border_color_ptr, "");
+   /* we don't have aligned type in the dynamic state unfortunately */
+   lp_set_load_alignment(border_color, 4);
+
+   /*
+    * Instead of having some incredibly complex logic which will try to figure out
+    * clamping necessary for each channel, simply use the first channel, and treat
+    * mixed signed/unsigned normalized formats specially.
+    * (Mixed non-normalized, which wouldn't work at all here, do not exist for a
+    * good reason.)
+    */
+   if (format_desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
+      int chan;
+      /* d/s needs special handling because both present means just sampling depth */
+      if (util_format_is_depth_and_stencil(format_desc->format)) {
+         chan = format_desc->swizzle[0];
+      }
+      else {
+         chan = util_format_get_first_non_void_channel(format_desc->format);
+      }
+      if (chan >= 0 && chan <= UTIL_FORMAT_SWIZZLE_W) {
+         unsigned chan_type = format_desc->channel[chan].type;
+         unsigned chan_norm = format_desc->channel[chan].normalized;
+         unsigned chan_pure = format_desc->channel[chan].pure_integer;
+         if (chan_type == UTIL_FORMAT_TYPE_SIGNED) {
+            if (chan_norm) {
+               min_clamp = lp_build_const_vec(gallivm, vec4_type, -1.0F);
+               max_clamp = vec4_bld.one;
+            }
+            else if (chan_pure) {
+               /*
+                * Border color was stored as int, hence need min/max clamp
+                * only if chan has less than 32 bits..
+                */
+               unsigned chan_size = format_desc->channel[chan].size;
+               if (chan_size < 32) {
+                  min_clamp = lp_build_const_int_vec(gallivm, vec4_type,
+                                                     0 - (1 << (chan_size - 1)));
+                  max_clamp = lp_build_const_int_vec(gallivm, vec4_type,
+                                                     (1 << (chan_size - 1)) - 1);
+               }
+            }
+            /* TODO: no idea about non-pure, non-normalized! */
+         }
+         else if (chan_type == UTIL_FORMAT_TYPE_UNSIGNED) {
+            if (chan_norm) {
+               min_clamp = vec4_bld.zero;
+               max_clamp = vec4_bld.one;
+            }
+            /*
+             * Need a ugly hack here, because we don't have Z32_FLOAT_X8X24
+             * we use Z32_FLOAT_S8X24 to imply sampling depth component
+             * and ignoring stencil, which will blow up here if we try to
+             * do a uint clamp in a float texel build...
+             * And even if we had that format, mesa st also thinks using z24s8
+             * means depth sampling ignoring stencil.
+             */
+            else if (chan_pure) {
+               /*
+                * Border color was stored as uint, hence never need min
+                * clamp, and only need max clamp if chan has less than 32 bits.
+                */
+               unsigned chan_size = format_desc->channel[chan].size;
+               if (chan_size < 32) {
+                  max_clamp = lp_build_const_int_vec(gallivm, vec4_type,
+                                                     (1 << chan_size) - 1);
+               }
+               /* TODO: no idea about non-pure, non-normalized! */
+            }
+         }
+         else if (chan_type == UTIL_FORMAT_TYPE_FIXED) {
+            /* TODO: I have no idea what clamp this would need if any! */
+         }
+      }
+      /* mixed plain formats (or different pure size) */
+      switch (format_desc->format) {
+      case PIPE_FORMAT_B10G10R10A2_UINT:
+      case PIPE_FORMAT_R10G10B10A2_UINT:
+      {
+         unsigned max10 = (1 << 10) - 1;
+         max_clamp = lp_build_const_aos(gallivm, vec4_type, max10, max10,
+                                        max10, (1 << 2) - 1, NULL);
+      }
+         break;
+      case PIPE_FORMAT_R10SG10SB10SA2U_NORM:
+         min_clamp = lp_build_const_aos(gallivm, vec4_type, -1.0F, -1.0F,
+                                        -1.0F, 0.0F, NULL);
+         max_clamp = vec4_bld.one;
+         break;
+      case PIPE_FORMAT_R8SG8SB8UX8U_NORM:
+      case PIPE_FORMAT_R5SG5SB6U_NORM:
+         min_clamp = lp_build_const_aos(gallivm, vec4_type, -1.0F, -1.0F,
+                                        0.0F, 0.0F, NULL);
+         max_clamp = vec4_bld.one;
+         break;
+      default:
+         break;
+      }
+   }
+   else {
+      /* cannot figure this out from format description */
+      if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
+         /* s3tc formats are always unorm */
+         min_clamp = vec4_bld.zero;
+         max_clamp = vec4_bld.one;
+      }
+      else if (format_desc->layout == UTIL_FORMAT_LAYOUT_RGTC ||
+               format_desc->layout == UTIL_FORMAT_LAYOUT_ETC) {
+         switch (format_desc->format) {
+         case PIPE_FORMAT_RGTC1_UNORM:
+         case PIPE_FORMAT_RGTC2_UNORM:
+         case PIPE_FORMAT_LATC1_UNORM:
+         case PIPE_FORMAT_LATC2_UNORM:
+         case PIPE_FORMAT_ETC1_RGB8:
+            min_clamp = vec4_bld.zero;
+            max_clamp = vec4_bld.one;
+            break;
+         case PIPE_FORMAT_RGTC1_SNORM:
+         case PIPE_FORMAT_RGTC2_SNORM:
+         case PIPE_FORMAT_LATC1_SNORM:
+         case PIPE_FORMAT_LATC2_SNORM:
+            min_clamp = lp_build_const_vec(gallivm, vec4_type, -1.0F);
+            max_clamp = vec4_bld.one;
+            break;
+         default:
+            assert(0);
+            break;
+         }
+      }
+      /*
+       * all others from subsampled/other group, though we don't care
+       * about yuv (and should not have any from zs here)
+       */
+      else if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_YUV){
+         switch (format_desc->format) {
+         case PIPE_FORMAT_R8G8_B8G8_UNORM:
+         case PIPE_FORMAT_G8R8_G8B8_UNORM:
+         case PIPE_FORMAT_G8R8_B8R8_UNORM:
+         case PIPE_FORMAT_R8G8_R8B8_UNORM:
+         case PIPE_FORMAT_R1_UNORM: /* doesn't make sense but ah well */
+            min_clamp = vec4_bld.zero;
+            max_clamp = vec4_bld.one;
+            break;
+         case PIPE_FORMAT_R8G8Bx_SNORM:
+            min_clamp = lp_build_const_vec(gallivm, vec4_type, -1.0F);
+            max_clamp = vec4_bld.one;
+            break;
+            /*
+             * Note smallfloat formats usually don't need clamping
+             * (they still have infinite range) however this is not
+             * true for r11g11b10 and r9g9b9e5, which can't represent
+             * negative numbers (and additionally r9g9b9e5 can't represent
+             * very large numbers). d3d10 seems happy without clamping in
+             * this case, but gl spec is pretty clear: "for floating
+             * point and integer formats, border values are clamped to
+             * the representable range of the format" so do that here.
+             */
+         case PIPE_FORMAT_R11G11B10_FLOAT:
+            min_clamp = vec4_bld.zero;
+            break;
+         case PIPE_FORMAT_R9G9B9E5_FLOAT:
+            min_clamp = vec4_bld.zero;
+            max_clamp = lp_build_const_vec(gallivm, vec4_type, MAX_RGB9E5);
+            break;
+         default:
+            assert(0);
+            break;
+         }
+      }
+   }
+
+   if (min_clamp) {
+      border_color = lp_build_max(&vec4_bld, border_color, min_clamp);
+   }
+   if (max_clamp) {
+      border_color = lp_build_min(&vec4_bld, border_color, max_clamp);
+   }
+
+   bld->border_color_clamped = border_color;
+}
+
+
+/**
+ * General texture sampling codegen.
+ * This function handles texture sampling for all texture targets (1D,
+ * 2D, 3D, cube) and all filtering modes.
+ */
+static void
+lp_build_sample_general(struct lp_build_sample_context *bld,
+                        unsigned sampler_unit,
+                        boolean is_gather,
+                        LLVMValueRef *coords,
+                        const LLVMValueRef *offsets,
+                        LLVMValueRef lod_positive,
+                        LLVMValueRef lod_fpart,
+                        LLVMValueRef ilevel0,
+                        LLVMValueRef ilevel1,
+                        LLVMValueRef *colors_out)
+{
+   LLVMBuilderRef builder = bld->gallivm->builder;
+   const struct lp_static_sampler_state *sampler_state = bld->static_sampler_state;
+   const unsigned mip_filter = sampler_state->min_mip_filter;
+   const unsigned min_filter = sampler_state->min_img_filter;
+   const unsigned mag_filter = sampler_state->mag_img_filter;
+   LLVMValueRef texels[4];
+   unsigned chan;
+
+   /* if we need border color, (potentially) clamp it now */
+   if (lp_sampler_wrap_mode_uses_border_color(sampler_state->wrap_s,
+                                              min_filter,
+                                              mag_filter) ||
+       (bld->dims > 1 &&
+           lp_sampler_wrap_mode_uses_border_color(sampler_state->wrap_t,
+                                                  min_filter,
+                                                  mag_filter)) ||
+       (bld->dims > 2 &&
+           lp_sampler_wrap_mode_uses_border_color(sampler_state->wrap_r,
+                                                  min_filter,
+                                                  mag_filter))) {
+      lp_build_clamp_border_color(bld, sampler_unit);
+   }
+
+
+   /*
+    * Get/interpolate texture colors.
+    */
+
+   for (chan = 0; chan < 4; ++chan) {
+     texels[chan] = lp_build_alloca(bld->gallivm, bld->texel_bld.vec_type, "");
+     lp_build_name(texels[chan], "sampler%u_texel_%c_var", sampler_unit, "xyzw"[chan]);
+   }
+
+   if (min_filter == mag_filter) {
+      /* no need to distinguish between minification and magnification */
+      lp_build_sample_mipmap(bld, min_filter, mip_filter,
+                             is_gather,
+                             coords, offsets,
+                             ilevel0, ilevel1, lod_fpart,
+                             texels);
+   }
+   else {
+      /*
+       * Could also get rid of the if-logic and always use mipmap_both, both
+       * for the single lod and multi-lod case if nothing really uses this.
+       */
+      if (bld->num_lods == 1) {
+         /* Emit conditional to choose min image filter or mag image filter
+          * depending on the lod being > 0 or <= 0, respectively.
+          */
+         struct lp_build_if_state if_ctx;
+
+         lod_positive = LLVMBuildTrunc(builder, lod_positive,
+                                       LLVMInt1TypeInContext(bld->gallivm->context), "");
+
+         lp_build_if(&if_ctx, bld->gallivm, lod_positive);
+         {
+            /* Use the minification filter */
+            lp_build_sample_mipmap(bld, min_filter, mip_filter, FALSE,
+                                   coords, offsets,
+                                   ilevel0, ilevel1, lod_fpart,
+                                   texels);
+         }
+         lp_build_else(&if_ctx);
+         {
+            /* Use the magnification filter */
+            lp_build_sample_mipmap(bld, mag_filter, PIPE_TEX_MIPFILTER_NONE,
+                                   FALSE,
+                                   coords, offsets,
+                                   ilevel0, NULL, NULL,
+                                   texels);
+         }
+         lp_build_endif(&if_ctx);
+      }
+      else {
+         LLVMValueRef need_linear, linear_mask;
+         unsigned mip_filter_for_nearest;
+         struct lp_build_if_state if_ctx;
+
+         if (min_filter == PIPE_TEX_FILTER_LINEAR) {
+            linear_mask = lod_positive;
+            mip_filter_for_nearest = PIPE_TEX_MIPFILTER_NONE;
+         }
+         else {
+            linear_mask = lp_build_not(&bld->lodi_bld, lod_positive);
+            mip_filter_for_nearest = mip_filter;
+         }
+         need_linear = lp_build_any_true_range(&bld->lodi_bld, bld->num_lods,
+                                               linear_mask);
+
+         if (bld->num_lods != bld->coord_type.length) {
+            linear_mask = lp_build_unpack_broadcast_aos_scalars(bld->gallivm,
+                                                                bld->lodi_type,
+                                                                bld->int_coord_type,
+                                                                linear_mask);
+         }
+
+         lp_build_if(&if_ctx, bld->gallivm, need_linear);
+         {
+            /*
+             * Do sampling with both filters simultaneously. This means using
+             * a linear filter and doing some tricks (with weights) for the pixels
+             * which need nearest filter.
+             * Note that it's probably rare some pixels need nearest and some
+             * linear filter but the fixups required for the nearest pixels
+             * aren't all that complicated so just always run a combined path
+             * if at least some pixels require linear.
+             */
+            lp_build_sample_mipmap_both(bld, linear_mask, mip_filter,
+                                        coords, offsets,
+                                        ilevel0, ilevel1,
+                                        lod_fpart, lod_positive,
+                                        texels);
+         }
+         lp_build_else(&if_ctx);
+         {
+            /*
+             * All pixels require just nearest filtering, which is way
+             * cheaper than linear, hence do a separate path for that.
+             */
+            lp_build_sample_mipmap(bld, PIPE_TEX_FILTER_NEAREST, FALSE,
+                                   mip_filter_for_nearest,
+                                   coords, offsets,
+                                   ilevel0, ilevel1, lod_fpart,
+                                   texels);
+         }
+         lp_build_endif(&if_ctx);
+      }
+   }
+
+   for (chan = 0; chan < 4; ++chan) {
+     colors_out[chan] = LLVMBuildLoad(builder, texels[chan], "");
+     lp_build_name(colors_out[chan], "sampler%u_texel_%c", sampler_unit, "xyzw"[chan]);
+   }
+}
+
+
+/**
+ * Texel fetch function.
+ * In contrast to general sampling there is no filtering, no coord minification,
+ * lod (if any) is always explicit uint, coords are uints (in terms of texel units)
+ * directly to be applied to the selected mip level (after adding texel offsets).
+ * This function handles texel fetch for all targets where texel fetch is supported
+ * (no cube maps, but 1d, 2d, 3d are supported, arrays and buffers should be too).
+ */
+static void
+lp_build_fetch_texel(struct lp_build_sample_context *bld,
+                     unsigned texture_unit,
+                     const LLVMValueRef *coords,
+                     LLVMValueRef explicit_lod,
+                     const LLVMValueRef *offsets,
+                     LLVMValueRef *colors_out)
+{
+   struct lp_build_context *perquadi_bld = &bld->lodi_bld;
+   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+   unsigned dims = bld->dims, chan;
+   unsigned target = bld->static_texture_state->target;
+   boolean out_of_bound_ret_zero = TRUE;
+   LLVMValueRef size, ilevel;
+   LLVMValueRef row_stride_vec = NULL, img_stride_vec = NULL;
+   LLVMValueRef x = coords[0], y = coords[1], z = coords[2];
+   LLVMValueRef width, height, depth, i, j;
+   LLVMValueRef offset, out_of_bounds, out1;
+
+   out_of_bounds = int_coord_bld->zero;
+
+   if (explicit_lod && bld->static_texture_state->target != PIPE_BUFFER) {
+      if (bld->num_mips != int_coord_bld->type.length) {
+         ilevel = lp_build_pack_aos_scalars(bld->gallivm, int_coord_bld->type,
+                                            perquadi_bld->type, explicit_lod, 0);
+      }
+      else {
+         ilevel = explicit_lod;
+      }
+      lp_build_nearest_mip_level(bld, texture_unit, ilevel, &ilevel,
+                                 out_of_bound_ret_zero ? &out_of_bounds : NULL);
+   }
+   else {
+      assert(bld->num_mips == 1);
+      if (bld->static_texture_state->target != PIPE_BUFFER) {
+         ilevel = bld->dynamic_state->first_level(bld->dynamic_state, bld->gallivm,
+                                                  bld->context_ptr, texture_unit);
+      }
+      else {
+         ilevel = lp_build_const_int32(bld->gallivm, 0);
+      }
+   }
+   lp_build_mipmap_level_sizes(bld, ilevel,
+                               &size,
+                               &row_stride_vec, &img_stride_vec);
+   lp_build_extract_image_sizes(bld, &bld->int_size_bld, int_coord_bld->type,
+                                size, &width, &height, &depth);
+
+   if (target == PIPE_TEXTURE_1D_ARRAY ||
+       target == PIPE_TEXTURE_2D_ARRAY) {
+      if (out_of_bound_ret_zero) {
+         z = lp_build_layer_coord(bld, texture_unit, FALSE, z, &out1);
+         out_of_bounds = lp_build_or(int_coord_bld, out_of_bounds, out1);
+      }
+      else {
+         z = lp_build_layer_coord(bld, texture_unit, FALSE, z, NULL);
+      }
+   }
+
+   /* This is a lot like border sampling */
+   if (offsets[0]) {
+      /*
+       * coords are really unsigned, offsets are signed, but I don't think
+       * exceeding 31 bits is possible
+       */
+      x = lp_build_add(int_coord_bld, x, offsets[0]);
+   }
+   out1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, x, int_coord_bld->zero);
+   out_of_bounds = lp_build_or(int_coord_bld, out_of_bounds, out1);
+   out1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, x, width);
+   out_of_bounds = lp_build_or(int_coord_bld, out_of_bounds, out1);
+
+   if (dims >= 2) {
+      if (offsets[1]) {
+         y = lp_build_add(int_coord_bld, y, offsets[1]);
+      }
+      out1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, y, int_coord_bld->zero);
+      out_of_bounds = lp_build_or(int_coord_bld, out_of_bounds, out1);
+      out1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, y, height);
+      out_of_bounds = lp_build_or(int_coord_bld, out_of_bounds, out1);
+
+      if (dims >= 3) {
+         if (offsets[2]) {
+            z = lp_build_add(int_coord_bld, z, offsets[2]);
+         }
+         out1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, z, int_coord_bld->zero);
+         out_of_bounds = lp_build_or(int_coord_bld, out_of_bounds, out1);
+         out1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, z, depth);
+         out_of_bounds = lp_build_or(int_coord_bld, out_of_bounds, out1);
+      }
+   }
+
+   lp_build_sample_offset(int_coord_bld,
+                          bld->format_desc,
+                          x, y, z, row_stride_vec, img_stride_vec,
+                          &offset, &i, &j);
+
+   if (bld->static_texture_state->target != PIPE_BUFFER) {
+      offset = lp_build_add(int_coord_bld, offset,
+                            lp_build_get_mip_offsets(bld, ilevel));
+   }
+
+   offset = lp_build_andnot(int_coord_bld, offset, out_of_bounds);
+
+   lp_build_fetch_rgba_soa(bld->gallivm,
+                           bld->format_desc,
+                           bld->texel_type,
+                           bld->base_ptr, offset,
+                           i, j,
+                           colors_out);
+
+   if (out_of_bound_ret_zero) {
+      /*
+       * Only needed for ARB_robust_buffer_access_behavior and d3d10.
+       * Could use min/max above instead of out-of-bounds comparisons
+       * if we don't care about the result returned for out-of-bounds.
+       */
+      for (chan = 0; chan < 4; chan++) {
+         colors_out[chan] = lp_build_select(&bld->texel_bld, out_of_bounds,
+                                            bld->texel_bld.zero, colors_out[chan]);
+      }
+   }
+}
+
+
+/**
+ * Just set texels to white instead of actually sampling the texture.
+ * For debugging.
+ */
+void
+lp_build_sample_nop(struct gallivm_state *gallivm,
+                    struct lp_type type,
+                    const LLVMValueRef *coords,
+                    LLVMValueRef texel_out[4])
+{
+   LLVMValueRef one = lp_build_one(gallivm, type);
+   unsigned chan;
+
+   for (chan = 0; chan < 4; chan++) {
+      texel_out[chan] = one;
+   }  
+}
+
+
+/**
+ * Build the actual texture sampling code.
+ * 'texel' will return a vector of four LLVMValueRefs corresponding to
+ * R, G, B, A.
+ * \param type  vector float type to use for coords, etc.
+ * \param sample_key
+ * \param derivs  partial derivatives of (s,t,r,q) with respect to x and y
+ */
+static void
+lp_build_sample_soa_code(struct gallivm_state *gallivm,
+                         const struct lp_static_texture_state *static_texture_state,
+                         const struct lp_static_sampler_state *static_sampler_state,
+                         struct lp_sampler_dynamic_state *dynamic_state,
+                         struct lp_type type,
+                         unsigned sample_key,
+                         unsigned texture_index,
+                         unsigned sampler_index,
+                         LLVMValueRef context_ptr,
+                         const LLVMValueRef *coords,
+                         const LLVMValueRef *offsets,
+                         const struct lp_derivatives *derivs, /* optional */
+                         LLVMValueRef lod, /* optional */
+                         LLVMValueRef texel_out[4])
+{
+   unsigned target = static_texture_state->target;
+   unsigned dims = texture_dims(target);
+   unsigned num_quads = type.length / 4;
+   unsigned mip_filter, min_img_filter, mag_img_filter, i;
+   struct lp_build_sample_context bld;
+   struct lp_static_sampler_state derived_sampler_state = *static_sampler_state;
+   LLVMTypeRef i32t = LLVMInt32TypeInContext(gallivm->context);
+   LLVMBuilderRef builder = gallivm->builder;
+   LLVMValueRef tex_width, newcoords[5];
+   enum lp_sampler_lod_property lod_property;
+   enum lp_sampler_lod_control lod_control;
+   enum lp_sampler_op_type op_type;
+   LLVMValueRef lod_bias = NULL;
+   LLVMValueRef explicit_lod = NULL;
+   boolean op_is_tex;
+
+   if (0) {
+      enum pipe_format fmt = static_texture_state->format;
+      debug_printf("Sample from %s\n", util_format_name(fmt));
+   }
+
+   lod_property = (sample_key & LP_SAMPLER_LOD_PROPERTY_MASK) >>
+                     LP_SAMPLER_LOD_PROPERTY_SHIFT;
+   lod_control = (sample_key & LP_SAMPLER_LOD_CONTROL_MASK) >>
+                    LP_SAMPLER_LOD_CONTROL_SHIFT;
+   op_type = (sample_key & LP_SAMPLER_OP_TYPE_MASK) >>
+                 LP_SAMPLER_OP_TYPE_SHIFT;
+
+   op_is_tex = op_type == LP_SAMPLER_OP_TEXTURE;
+
+   if (lod_control == LP_SAMPLER_LOD_BIAS) {
+      lod_bias = lod;
+      assert(lod);
+      assert(derivs == NULL);
+   }
+   else if (lod_control == LP_SAMPLER_LOD_EXPLICIT) {
+      explicit_lod = lod;
+      assert(lod);
+      assert(derivs == NULL);
+   }
+   else if (lod_control == LP_SAMPLER_LOD_DERIVATIVES) {
+      assert(derivs);
+      assert(lod == NULL);
+   }
+   else {
+      assert(derivs == NULL);
+      assert(lod == NULL);
+   }
+
+   if (static_texture_state->format == PIPE_FORMAT_NONE) {
+      /*
+       * If there's nothing bound, format is NONE, and we must return
+       * all zero as mandated by d3d10 in this case.
+       */
+      unsigned chan;
+      LLVMValueRef zero = lp_build_zero(gallivm, type);
+      for (chan = 0; chan < 4; chan++) {
+         texel_out[chan] = zero;
+      }
+      return;
+   }
+
+   assert(type.floating);
+
+   /* Setup our build context */
+   memset(&bld, 0, sizeof bld);
+   bld.gallivm = gallivm;
+   bld.context_ptr = context_ptr;
+   bld.static_sampler_state = &derived_sampler_state;
+   bld.static_texture_state = static_texture_state;
+   bld.dynamic_state = dynamic_state;
+   bld.format_desc = util_format_description(static_texture_state->format);
+   bld.dims = dims;
+
+   bld.vector_width = lp_type_width(type);
+
+   bld.float_type = lp_type_float(32);
+   bld.int_type = lp_type_int(32);
+   bld.coord_type = type;
+   bld.int_coord_type = lp_int_type(type);
+   bld.float_size_in_type = lp_type_float(32);
+   bld.float_size_in_type.length = dims > 1 ? 4 : 1;
+   bld.int_size_in_type = lp_int_type(bld.float_size_in_type);
+   bld.texel_type = type;
+
+   /* always using the first channel hopefully should be safe,
+    * if not things WILL break in other places anyway.
+    */
+   if (bld.format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB &&
+       bld.format_desc->channel[0].pure_integer) {
+      if (bld.format_desc->channel[0].type == UTIL_FORMAT_TYPE_SIGNED) {
+         bld.texel_type = lp_type_int_vec(type.width, type.width * type.length);
+      }
+      else if (bld.format_desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED) {
+         bld.texel_type = lp_type_uint_vec(type.width, type.width * type.length);
+      }
+   }
+   else if (util_format_has_stencil(bld.format_desc) &&
+       !util_format_has_depth(bld.format_desc)) {
+      /* for stencil only formats, sample stencil (uint) */
+      bld.texel_type = lp_type_int_vec(type.width, type.width * type.length);
+   }
+
+   if (!static_texture_state->level_zero_only) {
+      derived_sampler_state.min_mip_filter = static_sampler_state->min_mip_filter;
+   } else {
+      derived_sampler_state.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
+   }
+   if (op_type == LP_SAMPLER_OP_GATHER) {
+      /*
+       * gather4 is exactly like GL_LINEAR filtering but in the end skipping
+       * the actual filtering. Using mostly the same paths, so cube face
+       * selection, coord wrapping etc. all naturally uses the same code.
+       */
+      derived_sampler_state.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
+      derived_sampler_state.min_img_filter = PIPE_TEX_FILTER_LINEAR;
+      derived_sampler_state.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
+   }
+   mip_filter = derived_sampler_state.min_mip_filter;
+
+   if (0) {
+      debug_printf("  .min_mip_filter = %u\n", derived_sampler_state.min_mip_filter);
+   }
+
+   if (static_texture_state->target == PIPE_TEXTURE_CUBE ||
+       static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY)
+   {
+      /*
+       * Seamless filtering ignores wrap modes.
+       * Setting to CLAMP_TO_EDGE is correct for nearest filtering, for
+       * bilinear it's not correct but way better than using for instance repeat.
+       * Note we even set this for non-seamless. Technically GL allows any wrap
+       * mode, which made sense when supporting true borders (can get seamless
+       * effect with border and CLAMP_TO_BORDER), but gallium doesn't support
+       * borders and d3d9 requires wrap modes to be ignored and it's a pain to fix
+       * up the sampler state (as it makes it texture dependent).
+       */
+      derived_sampler_state.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+      derived_sampler_state.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+   }
+
+   min_img_filter = derived_sampler_state.min_img_filter;
+   mag_img_filter = derived_sampler_state.mag_img_filter;
+
+
+   /*
+    * This is all a bit complicated different paths are chosen for performance
+    * reasons.
+    * Essentially, there can be 1 lod per element, 1 lod per quad or 1 lod for
+    * everything (the last two options are equivalent for 4-wide case).
+    * If there's per-quad lod but we split to 4-wide so we can use AoS, per-quad
+    * lod is calculated then the lod value extracted afterwards so making this
+    * case basically the same as far as lod handling is concerned for the
+    * further sample/filter code as the 1 lod for everything case.
+    * Different lod handling mostly shows up when building mipmap sizes
+    * (lp_build_mipmap_level_sizes() and friends) and also in filtering
+    * (getting the fractional part of the lod to the right texels).
+    */
+
+   /*
+    * There are other situations where at least the multiple int lods could be
+    * avoided like min and max lod being equal.
+    */
+   bld.num_mips = bld.num_lods = 1;
+
+   if ((gallivm_debug & GALLIVM_DEBUG_NO_QUAD_LOD) &&
+       (gallivm_debug & GALLIVM_DEBUG_NO_RHO_APPROX) &&
+       (static_texture_state->target == PIPE_TEXTURE_CUBE ||
+        static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) &&
+       (op_is_tex && mip_filter != PIPE_TEX_MIPFILTER_NONE)) {
+      /*
+       * special case for using per-pixel lod even for implicit lod,
+       * which is generally never required (ok by APIs) except to please
+       * some (somewhat broken imho) tests (because per-pixel face selection
+       * can cause derivatives to be different for pixels outside the primitive
+       * due to the major axis division even if pre-project derivatives are
+       * looking normal).
+       */
+      bld.num_mips = type.length;
+      bld.num_lods = type.length;
+   }
+   else if (lod_property == LP_SAMPLER_LOD_PER_ELEMENT ||
+       (explicit_lod || lod_bias || derivs)) {
+      if ((!op_is_tex && target != PIPE_BUFFER) ||
+          (op_is_tex && mip_filter != PIPE_TEX_MIPFILTER_NONE)) {
+         bld.num_mips = type.length;
+         bld.num_lods = type.length;
+      }
+      else if (op_is_tex && min_img_filter != mag_img_filter) {
+         bld.num_mips = 1;
+         bld.num_lods = type.length;
+      }
+   }
+   /* TODO: for true scalar_lod should only use 1 lod value */
+   else if ((!op_is_tex && explicit_lod && target != PIPE_BUFFER) ||
+            (op_is_tex && mip_filter != PIPE_TEX_MIPFILTER_NONE)) {
+      bld.num_mips = num_quads;
+      bld.num_lods = num_quads;
+   }
+   else if (op_is_tex && min_img_filter != mag_img_filter) {
+      bld.num_mips = 1;
+      bld.num_lods = num_quads;
+   }
+
+
+   bld.lodf_type = type;
+   /* we want native vector size to be able to use our intrinsics */
+   if (bld.num_lods != type.length) {
+      /* TODO: this currently always has to be per-quad or per-element */
+      bld.lodf_type.length = type.length > 4 ? ((type.length + 15) / 16) * 4 : 1;
+   }
+   bld.lodi_type = lp_int_type(bld.lodf_type);
+   bld.levelf_type = bld.lodf_type;
+   if (bld.num_mips == 1) {
+      bld.levelf_type.length = 1;
+   }
+   bld.leveli_type = lp_int_type(bld.levelf_type);
+   bld.float_size_type = bld.float_size_in_type;
+   /* Note: size vectors may not be native. They contain minified w/h/d/_ values,
+    * with per-element lod that is w0/h0/d0/_/w1/h1/d1_/... so up to 8x4f32 */
+   if (bld.num_mips > 1) {
+      bld.float_size_type.length = bld.num_mips == type.length ?
+                                      bld.num_mips * bld.float_size_in_type.length :
+                                      type.length;
+   }
+   bld.int_size_type = lp_int_type(bld.float_size_type);
+
+   lp_build_context_init(&bld.float_bld, gallivm, bld.float_type);
+   lp_build_context_init(&bld.float_vec_bld, gallivm, type);
+   lp_build_context_init(&bld.int_bld, gallivm, bld.int_type);
+   lp_build_context_init(&bld.coord_bld, gallivm, bld.coord_type);
+   lp_build_context_init(&bld.int_coord_bld, gallivm, bld.int_coord_type);
+   lp_build_context_init(&bld.int_size_in_bld, gallivm, bld.int_size_in_type);
+   lp_build_context_init(&bld.float_size_in_bld, gallivm, bld.float_size_in_type);
+   lp_build_context_init(&bld.int_size_bld, gallivm, bld.int_size_type);
+   lp_build_context_init(&bld.float_size_bld, gallivm, bld.float_size_type);
+   lp_build_context_init(&bld.texel_bld, gallivm, bld.texel_type);
+   lp_build_context_init(&bld.levelf_bld, gallivm, bld.levelf_type);
+   lp_build_context_init(&bld.leveli_bld, gallivm, bld.leveli_type);
+   lp_build_context_init(&bld.lodf_bld, gallivm, bld.lodf_type);
+   lp_build_context_init(&bld.lodi_bld, gallivm, bld.lodi_type);
+
+   /* Get the dynamic state */
+   tex_width = dynamic_state->width(dynamic_state, gallivm,
+                                    context_ptr, texture_index);
+   bld.row_stride_array = dynamic_state->row_stride(dynamic_state, gallivm,
+                                                    context_ptr, texture_index);
+   bld.img_stride_array = dynamic_state->img_stride(dynamic_state, gallivm,
+                                                    context_ptr, texture_index);
+   bld.base_ptr = dynamic_state->base_ptr(dynamic_state, gallivm,
+                                          context_ptr, texture_index);
+   bld.mip_offsets = dynamic_state->mip_offsets(dynamic_state, gallivm,
+                                                context_ptr, texture_index);
+   /* Note that mip_offsets is an array[level] of offsets to texture images */
+
+   /* width, height, depth as single int vector */
+   if (dims <= 1) {
+      bld.int_size = tex_width;
+   }
+   else {
+      bld.int_size = LLVMBuildInsertElement(builder, bld.int_size_in_bld.undef,
+                                            tex_width,
+                                            LLVMConstInt(i32t, 0, 0), "");
+      if (dims >= 2) {
+         LLVMValueRef tex_height =
+            dynamic_state->height(dynamic_state, gallivm,
+                                  context_ptr, texture_index);
+         bld.int_size = LLVMBuildInsertElement(builder, bld.int_size,
+                                               tex_height,
+                                               LLVMConstInt(i32t, 1, 0), "");
+         if (dims >= 3) {
+            LLVMValueRef tex_depth =
+               dynamic_state->depth(dynamic_state, gallivm, context_ptr,
+                                    texture_index);
+            bld.int_size = LLVMBuildInsertElement(builder, bld.int_size,
+                                                  tex_depth,
+                                                  LLVMConstInt(i32t, 2, 0), "");
+         }
+      }
+   }
+
+   for (i = 0; i < 5; i++) {
+      newcoords[i] = coords[i];
+   }
+
+   if (0) {
+      /* For debug: no-op texture sampling */
+      lp_build_sample_nop(gallivm,
+                          bld.texel_type,
+                          newcoords,
+                          texel_out);
+   }
+
+   else if (op_type == LP_SAMPLER_OP_FETCH) {
+      lp_build_fetch_texel(&bld, texture_index, newcoords,
+                           lod, offsets,
+                           texel_out);
+   }
+
+   else {
+      LLVMValueRef lod_fpart = NULL, lod_positive = NULL;
+      LLVMValueRef ilevel0 = NULL, ilevel1 = NULL;
+      boolean use_aos;
+
+      if (util_format_is_pure_integer(static_texture_state->format) &&
+          !util_format_has_depth(bld.format_desc) &&
+          (static_sampler_state->min_mip_filter == PIPE_TEX_MIPFILTER_LINEAR ||
+           static_sampler_state->min_img_filter == PIPE_TEX_FILTER_LINEAR ||
+           static_sampler_state->mag_img_filter == PIPE_TEX_FILTER_LINEAR)) {
+         /*
+          * Bail if impossible filtering is specified (the awkard additional
+          * depth check is because it is legal in gallium to have things like S8Z24
+          * here which would say it's pure int despite such formats should sample
+          * the depth component).
+          * In GL such filters make the texture incomplete, this makes it robust
+          * against state trackers which set this up regardless (we'd crash in the
+          * lerp later (except for gather)).
+          * Must do this after fetch_texel code since with GL state tracker we'll
+          * get some junk sampler for buffer textures.
+          */
+         unsigned chan;
+         LLVMValueRef zero = lp_build_zero(gallivm, type);
+         for (chan = 0; chan < 4; chan++) {
+            texel_out[chan] = zero;
+         }
+         return;
+      }
+
+      use_aos = util_format_fits_8unorm(bld.format_desc) &&
+                op_is_tex &&
+                /* not sure this is strictly needed or simply impossible */
+                derived_sampler_state.compare_mode == PIPE_TEX_COMPARE_NONE &&
+                lp_is_simple_wrap_mode(derived_sampler_state.wrap_s);
+
+      use_aos &= bld.num_lods <= num_quads ||
+                 derived_sampler_state.min_img_filter ==
+                    derived_sampler_state.mag_img_filter;
+      if (dims > 1) {
+         use_aos &= lp_is_simple_wrap_mode(derived_sampler_state.wrap_t);
+         if (dims > 2) {
+            use_aos &= lp_is_simple_wrap_mode(derived_sampler_state.wrap_r);
+         }
+      }
+      if ((static_texture_state->target == PIPE_TEXTURE_CUBE ||
+           static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) &&
+          derived_sampler_state.seamless_cube_map &&
+          (derived_sampler_state.min_img_filter == PIPE_TEX_FILTER_LINEAR ||
+           derived_sampler_state.mag_img_filter == PIPE_TEX_FILTER_LINEAR)) {
+         /* theoretically possible with AoS filtering but not implemented (complex!) */
+         use_aos = 0;
+      }
+
+      if ((gallivm_debug & GALLIVM_DEBUG_PERF) &&
+          !use_aos && util_format_fits_8unorm(bld.format_desc)) {
+         debug_printf("%s: using floating point linear filtering for %s\n",
+                      __FUNCTION__, bld.format_desc->short_name);
+         debug_printf("  min_img %d  mag_img %d  mip %d  target %d  seamless %d"
+                      "  wraps %d  wrapt %d  wrapr %d\n",
+                      derived_sampler_state.min_img_filter,
+                      derived_sampler_state.mag_img_filter,
+                      derived_sampler_state.min_mip_filter,
+                      static_texture_state->target,
+                      derived_sampler_state.seamless_cube_map,
+                      derived_sampler_state.wrap_s,
+                      derived_sampler_state.wrap_t,
+                      derived_sampler_state.wrap_r);
+      }
+
+      lp_build_sample_common(&bld, texture_index, sampler_index,
+                             newcoords,
+                             derivs, lod_bias, explicit_lod,
+                             &lod_positive, &lod_fpart,
+                             &ilevel0, &ilevel1);
+
+      if (use_aos && static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) {
+         /* The aos path doesn't do seamless filtering so simply add cube layer
+          * to face now.
+          */
+         newcoords[2] = lp_build_add(&bld.int_coord_bld, newcoords[2], newcoords[3]);
+      }
+
+      /*
+       * we only try 8-wide sampling with soa as it appears to
+       * be a loss with aos with AVX (but it should work, except
+       * for conformance if min_filter != mag_filter if num_lods > 1).
+       * (It should be faster if we'd support avx2)
+       */
+      if (num_quads == 1 || !use_aos) {
+         if (use_aos) {
+            /* do sampling/filtering with fixed pt arithmetic */
+            lp_build_sample_aos(&bld, sampler_index,
+                                newcoords[0], newcoords[1],
+                                newcoords[2],
+                                offsets, lod_positive, lod_fpart,
+                                ilevel0, ilevel1,
+                                texel_out);
+         }
+
+         else {
+            lp_build_sample_general(&bld, sampler_index,
+                                    op_type == LP_SAMPLER_OP_GATHER,
+                                    newcoords, offsets,
+                                    lod_positive, lod_fpart,
+                                    ilevel0, ilevel1,
+                                    texel_out);
+         }
+      }
+      else {
+         unsigned j;
+         struct lp_build_sample_context bld4;
+         struct lp_type type4 = type;
+         unsigned i;
+         LLVMValueRef texelout4[4];
+         LLVMValueRef texelouttmp[4][LP_MAX_VECTOR_LENGTH/16];
+
+         type4.length = 4;
+
+         /* Setup our build context */
+         memset(&bld4, 0, sizeof bld4);
+         bld4.gallivm = bld.gallivm;
+         bld4.context_ptr = bld.context_ptr;
+         bld4.static_texture_state = bld.static_texture_state;
+         bld4.static_sampler_state = bld.static_sampler_state;
+         bld4.dynamic_state = bld.dynamic_state;
+         bld4.format_desc = bld.format_desc;
+         bld4.dims = bld.dims;
+         bld4.row_stride_array = bld.row_stride_array;
+         bld4.img_stride_array = bld.img_stride_array;
+         bld4.base_ptr = bld.base_ptr;
+         bld4.mip_offsets = bld.mip_offsets;
+         bld4.int_size = bld.int_size;
+
+         bld4.vector_width = lp_type_width(type4);
+
+         bld4.float_type = lp_type_float(32);
+         bld4.int_type = lp_type_int(32);
+         bld4.coord_type = type4;
+         bld4.int_coord_type = lp_int_type(type4);
+         bld4.float_size_in_type = lp_type_float(32);
+         bld4.float_size_in_type.length = dims > 1 ? 4 : 1;
+         bld4.int_size_in_type = lp_int_type(bld4.float_size_in_type);
+         bld4.texel_type = bld.texel_type;
+         bld4.texel_type.length = 4;
+
+         bld4.num_mips = bld4.num_lods = 1;
+         if ((gallivm_debug & GALLIVM_DEBUG_NO_QUAD_LOD) &&
+             (gallivm_debug & GALLIVM_DEBUG_NO_RHO_APPROX) &&
+             (static_texture_state->target == PIPE_TEXTURE_CUBE ||
+              static_texture_state->target == PIPE_TEXTURE_CUBE_ARRAY) &&
+             (op_is_tex && mip_filter != PIPE_TEX_MIPFILTER_NONE)) {
+            bld4.num_mips = type4.length;
+            bld4.num_lods = type4.length;
+         }
+         if (lod_property == LP_SAMPLER_LOD_PER_ELEMENT &&
+             (explicit_lod || lod_bias || derivs)) {
+            if ((!op_is_tex && target != PIPE_BUFFER) ||
+                (op_is_tex && mip_filter != PIPE_TEX_MIPFILTER_NONE)) {
+               bld4.num_mips = type4.length;
+               bld4.num_lods = type4.length;
+            }
+            else if (op_is_tex && min_img_filter != mag_img_filter) {
+               bld4.num_mips = 1;
+               bld4.num_lods = type4.length;
+            }
+         }
+
+         /* we want native vector size to be able to use our intrinsics */
+         bld4.lodf_type = type4;
+         if (bld4.num_lods != type4.length) {
+            bld4.lodf_type.length = 1;
+         }
+         bld4.lodi_type = lp_int_type(bld4.lodf_type);
+         bld4.levelf_type = type4;
+         if (bld4.num_mips != type4.length) {
+            bld4.levelf_type.length = 1;
+         }
+         bld4.leveli_type = lp_int_type(bld4.levelf_type);
+         bld4.float_size_type = bld4.float_size_in_type;
+         if (bld4.num_mips > 1) {
+            bld4.float_size_type.length = bld4.num_mips == type4.length ?
+                                            bld4.num_mips * bld4.float_size_in_type.length :
+                                            type4.length;
+         }
+         bld4.int_size_type = lp_int_type(bld4.float_size_type);
+
+         lp_build_context_init(&bld4.float_bld, gallivm, bld4.float_type);
+         lp_build_context_init(&bld4.float_vec_bld, gallivm, type4);
+         lp_build_context_init(&bld4.int_bld, gallivm, bld4.int_type);
+         lp_build_context_init(&bld4.coord_bld, gallivm, bld4.coord_type);
+         lp_build_context_init(&bld4.int_coord_bld, gallivm, bld4.int_coord_type);
+         lp_build_context_init(&bld4.int_size_in_bld, gallivm, bld4.int_size_in_type);
+         lp_build_context_init(&bld4.float_size_in_bld, gallivm, bld4.float_size_in_type);
+         lp_build_context_init(&bld4.int_size_bld, gallivm, bld4.int_size_type);
+         lp_build_context_init(&bld4.float_size_bld, gallivm, bld4.float_size_type);
+         lp_build_context_init(&bld4.texel_bld, gallivm, bld4.texel_type);
+         lp_build_context_init(&bld4.levelf_bld, gallivm, bld4.levelf_type);
+         lp_build_context_init(&bld4.leveli_bld, gallivm, bld4.leveli_type);
+         lp_build_context_init(&bld4.lodf_bld, gallivm, bld4.lodf_type);
+         lp_build_context_init(&bld4.lodi_bld, gallivm, bld4.lodi_type);
+
+         for (i = 0; i < num_quads; i++) {
+            LLVMValueRef s4, t4, r4;
+            LLVMValueRef lod_positive4, lod_fpart4 = NULL;
+            LLVMValueRef ilevel04, ilevel14 = NULL;
+            LLVMValueRef offsets4[4] = { NULL };
+            unsigned num_lods = bld4.num_lods;
+
+            s4 = lp_build_extract_range(gallivm, newcoords[0], 4*i, 4);
+            t4 = lp_build_extract_range(gallivm, newcoords[1], 4*i, 4);
+            r4 = lp_build_extract_range(gallivm, newcoords[2], 4*i, 4);
+
+            if (offsets[0]) {
+               offsets4[0] = lp_build_extract_range(gallivm, offsets[0], 4*i, 4);
+               if (dims > 1) {
+                  offsets4[1] = lp_build_extract_range(gallivm, offsets[1], 4*i, 4);
+                  if (dims > 2) {
+                     offsets4[2] = lp_build_extract_range(gallivm, offsets[2], 4*i, 4);
+                  }
+               }
+            }
+            lod_positive4 = lp_build_extract_range(gallivm, lod_positive, num_lods * i, num_lods);
+            ilevel04 = bld.num_mips == 1 ? ilevel0 :
+                          lp_build_extract_range(gallivm, ilevel0, num_lods * i, num_lods);
+            if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
+               ilevel14 = lp_build_extract_range(gallivm, ilevel1, num_lods * i, num_lods);
+               lod_fpart4 = lp_build_extract_range(gallivm, lod_fpart, num_lods * i, num_lods);
+            }
+
+            if (use_aos) {
+               /* do sampling/filtering with fixed pt arithmetic */
+               lp_build_sample_aos(&bld4, sampler_index,
+                                   s4, t4, r4, offsets4,
+                                   lod_positive4, lod_fpart4,
+                                   ilevel04, ilevel14,
+                                   texelout4);
+            }
+
+            else {
+               /* this path is currently unreachable and hence might break easily... */
+               LLVMValueRef newcoords4[5];
+               newcoords4[0] = s4;
+               newcoords4[1] = t4;
+               newcoords4[2] = r4;
+               newcoords4[3] = lp_build_extract_range(gallivm, newcoords[3], 4*i, 4);
+               newcoords4[4] = lp_build_extract_range(gallivm, newcoords[4], 4*i, 4);
+
+               lp_build_sample_general(&bld4, sampler_index,
+                                       op_type == LP_SAMPLER_OP_GATHER,
+                                       newcoords4, offsets4,
+                                       lod_positive4, lod_fpart4,
+                                       ilevel04, ilevel14,
+                                       texelout4);
+            }
+            for (j = 0; j < 4; j++) {
+               texelouttmp[j][i] = texelout4[j];
+            }
+         }
+
+         for (j = 0; j < 4; j++) {
+            texel_out[j] = lp_build_concat(gallivm, texelouttmp[j], type4, num_quads);
+         }
+      }
+   }
+
+   if (target != PIPE_BUFFER && op_type != LP_SAMPLER_OP_GATHER) {
+      apply_sampler_swizzle(&bld, texel_out);
+   }
+
+   /*
+    * texel type can be a (32bit) int/uint (for pure int formats only),
+    * however we are expected to always return floats (storage is untyped).
+    */
+   if (!bld.texel_type.floating) {
+      unsigned chan;
+      for (chan = 0; chan < 4; chan++) {
+         texel_out[chan] = LLVMBuildBitCast(builder, texel_out[chan],
+                                            lp_build_vec_type(gallivm, type), "");
+      }
+   }
+}
+
+
+#define USE_TEX_FUNC_CALL 1
+
+#define LP_MAX_TEX_FUNC_ARGS 32
+
+static inline void
+get_target_info(enum pipe_texture_target target,
+                unsigned *num_coords, unsigned *num_derivs,
+                unsigned *num_offsets, unsigned *layer)
+{
+   unsigned dims = texture_dims(target);
+   *num_coords = dims;
+   *num_offsets = dims;
+   *num_derivs = (target == PIPE_TEXTURE_CUBE ||
+                  target == PIPE_TEXTURE_CUBE_ARRAY) ? 3 : dims;
+   *layer = has_layer_coord(target) ? 2: 0;
+   if (target == PIPE_TEXTURE_CUBE_ARRAY) {
+      /*
+       * dims doesn't include r coord for cubes - this is handled
+       * by layer instead, but need to fix up for cube arrays...
+       */
+      *layer = 3;
+      *num_coords = 3;
+   }
+}
+
+
+/**
+ * Generate the function body for a texture sampling function.
+ */
+static void
+lp_build_sample_gen_func(struct gallivm_state *gallivm,
+                         const struct lp_static_texture_state *static_texture_state,
+                         const struct lp_static_sampler_state *static_sampler_state,
+                         struct lp_sampler_dynamic_state *dynamic_state,
+                         struct lp_type type,
+                         unsigned texture_index,
+                         unsigned sampler_index,
+                         LLVMValueRef function,
+                         unsigned num_args,
+                         unsigned sample_key)
+{
+   LLVMBuilderRef old_builder;
+   LLVMBasicBlockRef block;
+   LLVMValueRef coords[5];
+   LLVMValueRef offsets[3] = { NULL };
+   LLVMValueRef lod = NULL;
+   LLVMValueRef context_ptr;
+   LLVMValueRef texel_out[4];
+   struct lp_derivatives derivs;
+   struct lp_derivatives *deriv_ptr = NULL;
+   unsigned num_param = 0;
+   unsigned i, num_coords, num_derivs, num_offsets, layer;
+   enum lp_sampler_lod_control lod_control;
+
+   lod_control = (sample_key & LP_SAMPLER_LOD_CONTROL_MASK) >>
+                    LP_SAMPLER_LOD_CONTROL_SHIFT;
+
+   get_target_info(static_texture_state->target,
+                   &num_coords, &num_derivs, &num_offsets, &layer);
+
+   /* "unpack" arguments */
+   context_ptr = LLVMGetParam(function, num_param++);
+   for (i = 0; i < num_coords; i++) {
+      coords[i] = LLVMGetParam(function, num_param++);
+   }
+   for (i = num_coords; i < 5; i++) {
+      /* This is rather unfortunate... */
+      coords[i] = lp_build_undef(gallivm, type);
+   }
+   if (layer) {
+      coords[layer] = LLVMGetParam(function, num_param++);
+   }
+   if (sample_key & LP_SAMPLER_SHADOW) {
+      coords[4] = LLVMGetParam(function, num_param++);
+   }
+   if (sample_key & LP_SAMPLER_OFFSETS) {
+      for (i = 0; i < num_offsets; i++) {
+         offsets[i] = LLVMGetParam(function, num_param++);
+      }
+   }
+   if (lod_control == LP_SAMPLER_LOD_BIAS ||
+       lod_control == LP_SAMPLER_LOD_EXPLICIT) {
+      lod = LLVMGetParam(function, num_param++);
+   }
+   else if (lod_control == LP_SAMPLER_LOD_DERIVATIVES) {
+      for (i = 0; i < num_derivs; i++) {
+         derivs.ddx[i] = LLVMGetParam(function, num_param++);
+         derivs.ddy[i] = LLVMGetParam(function, num_param++);
+      }
+      deriv_ptr = &derivs;
+   }
+
+   assert(num_args == num_param);
+
+   /*
+    * Function body
+    */
+
+   old_builder = gallivm->builder;
+   block = LLVMAppendBasicBlockInContext(gallivm->context, function, "entry");
+   gallivm->builder = LLVMCreateBuilderInContext(gallivm->context);
+   LLVMPositionBuilderAtEnd(gallivm->builder, block);
+
+   lp_build_sample_soa_code(gallivm,
+                            static_texture_state,
+                            static_sampler_state,
+                            dynamic_state,
+                            type,
+                            sample_key,
+                            texture_index,
+                            sampler_index,
+                            context_ptr,
+                            coords,
+                            offsets,
+                            deriv_ptr,
+                            lod,
+                            texel_out);
+
+   LLVMBuildAggregateRet(gallivm->builder, texel_out, 4);
+
+   LLVMDisposeBuilder(gallivm->builder);
+   gallivm->builder = old_builder;
+
+   gallivm_verify_function(gallivm, function);
+}
+
+
+/**
+ * Call the matching function for texture sampling.
+ * If there's no match, generate a new one.
+ */
+static void
+lp_build_sample_soa_func(struct gallivm_state *gallivm,
+                         const struct lp_static_texture_state *static_texture_state,
+                         const struct lp_static_sampler_state *static_sampler_state,
+                         struct lp_sampler_dynamic_state *dynamic_state,
+                         const struct lp_sampler_params *params)
+{
+   LLVMBuilderRef builder = gallivm->builder;
+   LLVMModuleRef module = LLVMGetGlobalParent(LLVMGetBasicBlockParent(
+                             LLVMGetInsertBlock(builder)));
+   LLVMValueRef function, inst;
+   LLVMValueRef args[LP_MAX_TEX_FUNC_ARGS];
+   LLVMBasicBlockRef bb;
+   LLVMValueRef tex_ret;
+   unsigned num_args = 0;
+   char func_name[64];
+   unsigned i, num_coords, num_derivs, num_offsets, layer;
+   unsigned texture_index = params->texture_index;
+   unsigned sampler_index = params->sampler_index;
+   unsigned sample_key = params->sample_key;
+   const LLVMValueRef *coords = params->coords;
+   const LLVMValueRef *offsets = params->offsets;
+   const struct lp_derivatives *derivs = params->derivs;
+   enum lp_sampler_lod_control lod_control;
+
+   lod_control = (sample_key & LP_SAMPLER_LOD_CONTROL_MASK) >>
+                    LP_SAMPLER_LOD_CONTROL_SHIFT;
+
+   get_target_info(static_texture_state->target,
+                   &num_coords, &num_derivs, &num_offsets, &layer);
+
+   /*
+    * texture function matches are found by name.
+    * Thus the name has to include both the texture and sampler unit
+    * (which covers all static state) plus the actual texture function
+    * (including things like offsets, shadow coord, lod control).
+    * Additionally lod_property has to be included too.
+    */
+
+   util_snprintf(func_name, sizeof(func_name), "texfunc_res_%d_sam_%d_%x",
+                 texture_index, sampler_index, sample_key);
+
+   function = LLVMGetNamedFunction(module, func_name);
+
+   if(!function) {
+      LLVMTypeRef arg_types[LP_MAX_TEX_FUNC_ARGS];
+      LLVMTypeRef ret_type;
+      LLVMTypeRef function_type;
+      LLVMTypeRef val_type[4];
+      unsigned num_param = 0;
+
+      /*
+       * Generate the function prototype.
+       */
+
+      arg_types[num_param++] = LLVMTypeOf(params->context_ptr);
+      for (i = 0; i < num_coords; i++) {
+         arg_types[num_param++] = LLVMTypeOf(coords[0]);
+         assert(LLVMTypeOf(coords[0]) == LLVMTypeOf(coords[i]));
+      }
+      if (layer) {
+         arg_types[num_param++] = LLVMTypeOf(coords[layer]);
+         assert(LLVMTypeOf(coords[0]) == LLVMTypeOf(coords[layer]));
+      }
+      if (sample_key & LP_SAMPLER_SHADOW) {
+         arg_types[num_param++] = LLVMTypeOf(coords[0]);
+      }
+      if (sample_key & LP_SAMPLER_OFFSETS) {
+         for (i = 0; i < num_offsets; i++) {
+            arg_types[num_param++] = LLVMTypeOf(offsets[0]);
+            assert(LLVMTypeOf(offsets[0]) == LLVMTypeOf(offsets[i]));
+         }
+      }
+      if (lod_control == LP_SAMPLER_LOD_BIAS ||
+          lod_control == LP_SAMPLER_LOD_EXPLICIT) {
+         arg_types[num_param++] = LLVMTypeOf(params->lod);
+      }
+      else if (lod_control == LP_SAMPLER_LOD_DERIVATIVES) {
+         for (i = 0; i < num_derivs; i++) {
+            arg_types[num_param++] = LLVMTypeOf(derivs->ddx[i]);
+            arg_types[num_param++] = LLVMTypeOf(derivs->ddy[i]);
+            assert(LLVMTypeOf(derivs->ddx[0]) == LLVMTypeOf(derivs->ddx[i]));
+            assert(LLVMTypeOf(derivs->ddy[0]) == LLVMTypeOf(derivs->ddy[i]));
+         }
+      }
+
+      val_type[0] = val_type[1] = val_type[2] = val_type[3] =
+         lp_build_vec_type(gallivm, params->type);
+      ret_type = LLVMStructTypeInContext(gallivm->context, val_type, 4, 0);
+      function_type = LLVMFunctionType(ret_type, arg_types, num_param, 0);
+      function = LLVMAddFunction(module, func_name, function_type);
+
+      for (i = 0; i < num_param; ++i) {
+         if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind) {
+            LLVMAddAttribute(LLVMGetParam(function, i), LLVMNoAliasAttribute);
+         }
+      }
+
+      LLVMSetFunctionCallConv(function, LLVMFastCallConv);
+      LLVMSetLinkage(function, LLVMPrivateLinkage);
+
+      lp_build_sample_gen_func(gallivm,
+                               static_texture_state,
+                               static_sampler_state,
+                               dynamic_state,
+                               params->type,
+                               texture_index,
+                               sampler_index,
+                               function,
+                               num_param,
+                               sample_key);
+   }
+
+   num_args = 0;
+   args[num_args++] = params->context_ptr;
+   for (i = 0; i < num_coords; i++) {
+      args[num_args++] = coords[i];
+   }
+   if (layer) {
+      args[num_args++] = coords[layer];
+   }
+   if (sample_key & LP_SAMPLER_SHADOW) {
+      args[num_args++] = coords[4];
+   }
+   if (sample_key & LP_SAMPLER_OFFSETS) {
+      for (i = 0; i < num_offsets; i++) {
+         args[num_args++] = offsets[i];
+      }
+   }
+   if (lod_control == LP_SAMPLER_LOD_BIAS ||
+       lod_control == LP_SAMPLER_LOD_EXPLICIT) {
+      args[num_args++] = params->lod;
+   }
+   else if (lod_control == LP_SAMPLER_LOD_DERIVATIVES) {
+      for (i = 0; i < num_derivs; i++) {
+         args[num_args++] = derivs->ddx[i];
+         args[num_args++] = derivs->ddy[i];
+      }
+   }
+
+   assert(num_args <= LP_MAX_TEX_FUNC_ARGS);
+
+   tex_ret = LLVMBuildCall(builder, function, args, num_args, "");
+   bb = LLVMGetInsertBlock(builder);
+   inst = LLVMGetLastInstruction(bb);
+   LLVMSetInstructionCallConv(inst, LLVMFastCallConv);
+
+   for (i = 0; i < 4; i++) {
+      params->texel[i] = LLVMBuildExtractValue(gallivm->builder, tex_ret, i, "");
+   }
+}
+
+
+/**
+ * Build texture sampling code.
+ * Either via a function call or inline it directly.
+ */
+void
+lp_build_sample_soa(const struct lp_static_texture_state *static_texture_state,
+                    const struct lp_static_sampler_state *static_sampler_state,
+                    struct lp_sampler_dynamic_state *dynamic_state,
+                    struct gallivm_state *gallivm,
+                    const struct lp_sampler_params *params)
+{
+   boolean use_tex_func = FALSE;
+
+   /*
+    * Do not use a function call if the sampling is "simple enough".
+    * We define this by
+    * a) format
+    * b) no mips (either one level only or no mip filter)
+    * No mips will definitely make the code smaller, though
+    * the format requirement is a bit iffy - there's some (SoA) formats
+    * which definitely generate less code. This does happen to catch
+    * some important cases though which are hurt quite a bit by using
+    * a call (though not really because of the call overhead but because
+    * they are reusing the same texture unit with some of the same
+    * parameters).
+    * Ideally we'd let llvm recognize this stuff by doing IPO passes.
+    */
+
+   if (USE_TEX_FUNC_CALL) {
+      const struct util_format_description *format_desc;
+      boolean simple_format;
+      boolean simple_tex;
+      enum lp_sampler_op_type op_type;
+      format_desc = util_format_description(static_texture_state->format);
+      simple_format = !format_desc ||
+                         (util_format_is_rgba8_variant(format_desc) &&
+                          format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB);
+
+      op_type = (params->sample_key & LP_SAMPLER_OP_TYPE_MASK) >>
+                    LP_SAMPLER_OP_TYPE_SHIFT;
+      simple_tex =
+         op_type != LP_SAMPLER_OP_TEXTURE ||
+           ((static_sampler_state->min_mip_filter == PIPE_TEX_MIPFILTER_NONE ||
+             static_texture_state->level_zero_only == TRUE) &&
+            static_sampler_state->min_img_filter == static_sampler_state->mag_img_filter);
+
+      use_tex_func = format_desc && !(simple_format && simple_tex);
+   }
+
+   if (use_tex_func) {
+      lp_build_sample_soa_func(gallivm,
+                               static_texture_state,
+                               static_sampler_state,
+                               dynamic_state,
+                               params);
+   }
+   else {
+      lp_build_sample_soa_code(gallivm,
+                               static_texture_state,
+                               static_sampler_state,
+                               dynamic_state,
+                               params->type,
+                               params->sample_key,
+                               params->texture_index,
+                               params->sampler_index,
+                               params->context_ptr,
+                               params->coords,
+                               params->offsets,
+                               params->derivs,
+                               params->lod,
+                               params->texel);
+   }
+}
+
+
+void
+lp_build_size_query_soa(struct gallivm_state *gallivm,
+                        const struct lp_static_texture_state *static_state,
+                        struct lp_sampler_dynamic_state *dynamic_state,
+                        struct lp_type int_type,
+                        unsigned texture_unit,
+                        unsigned target,
+                        LLVMValueRef context_ptr,
+                        boolean is_sviewinfo,
+                        enum lp_sampler_lod_property lod_property,
+                        LLVMValueRef explicit_lod,
+                        LLVMValueRef *sizes_out)
+{
+   LLVMValueRef lod, level, size;
+   LLVMValueRef first_level = NULL;
+   int dims, i;
+   boolean has_array;
+   unsigned num_lods = 1;
+   struct lp_build_context bld_int_vec4;
+
+   if (static_state->format == PIPE_FORMAT_NONE) {
+      /*
+       * If there's nothing bound, format is NONE, and we must return
+       * all zero as mandated by d3d10 in this case.
+       */
+      unsigned chan;
+      LLVMValueRef zero = lp_build_const_vec(gallivm, int_type, 0.0F);
+      for (chan = 0; chan < 4; chan++) {
+         sizes_out[chan] = zero;
+      }
+      return;
+   }
+
+   /*
+    * Do some sanity verification about bound texture and shader dcl target.
+    * Not entirely sure what's possible but assume array/non-array
+    * always compatible (probably not ok for OpenGL but d3d10 has no
+    * distinction of arrays at the resource level).
+    * Everything else looks bogus (though not entirely sure about rect/2d).
+    * Currently disabled because it causes assertion failures if there's
+    * nothing bound (or rather a dummy texture, not that this case would
+    * return the right values).
+    */
+   if (0 && static_state->target != target) {
+      if (static_state->target == PIPE_TEXTURE_1D)
+         assert(target == PIPE_TEXTURE_1D_ARRAY);
+      else if (static_state->target == PIPE_TEXTURE_1D_ARRAY)
+         assert(target == PIPE_TEXTURE_1D);
+      else if (static_state->target == PIPE_TEXTURE_2D)
+         assert(target == PIPE_TEXTURE_2D_ARRAY);
+      else if (static_state->target == PIPE_TEXTURE_2D_ARRAY)
+         assert(target == PIPE_TEXTURE_2D);
+      else if (static_state->target == PIPE_TEXTURE_CUBE)
+         assert(target == PIPE_TEXTURE_CUBE_ARRAY);
+      else if (static_state->target == PIPE_TEXTURE_CUBE_ARRAY)
+         assert(target == PIPE_TEXTURE_CUBE);
+      else
+         assert(0);
+   }
+
+   dims = texture_dims(target);
+
+   switch (target) {
+   case PIPE_TEXTURE_1D_ARRAY:
+   case PIPE_TEXTURE_2D_ARRAY:
+   case PIPE_TEXTURE_CUBE_ARRAY:
+      has_array = TRUE;
+      break;
+   default:
+      has_array = FALSE;
+      break;
+   }
+
+   assert(!int_type.floating);
+
+   lp_build_context_init(&bld_int_vec4, gallivm, lp_type_int_vec(32, 128));
+
+   if (explicit_lod) {
+      /* FIXME: this needs to honor per-element lod */
+      lod = LLVMBuildExtractElement(gallivm->builder, explicit_lod,
+                                    lp_build_const_int32(gallivm, 0), "");
+      first_level = dynamic_state->first_level(dynamic_state, gallivm,
+                                               context_ptr, texture_unit);
+      level = LLVMBuildAdd(gallivm->builder, lod, first_level, "level");
+      lod = lp_build_broadcast_scalar(&bld_int_vec4, level);
+   } else {
+      lod = bld_int_vec4.zero;
+   }
+
+   size = bld_int_vec4.undef;
+
+   size = LLVMBuildInsertElement(gallivm->builder, size,
+                                 dynamic_state->width(dynamic_state, gallivm,
+                                                      context_ptr, texture_unit),
+                                 lp_build_const_int32(gallivm, 0), "");
+
+   if (dims >= 2) {
+      size = LLVMBuildInsertElement(gallivm->builder, size,
+                                    dynamic_state->height(dynamic_state, gallivm,
+                                                          context_ptr, texture_unit),
+                                    lp_build_const_int32(gallivm, 1), "");
+   }
+
+   if (dims >= 3) {
+      size = LLVMBuildInsertElement(gallivm->builder, size,
+                                    dynamic_state->depth(dynamic_state, gallivm,
+                                                         context_ptr, texture_unit),
+                                    lp_build_const_int32(gallivm, 2), "");
+   }
+
+   size = lp_build_minify(&bld_int_vec4, size, lod, TRUE);
+
+   if (has_array) {
+      LLVMValueRef layers = dynamic_state->depth(dynamic_state, gallivm,
+                                                 context_ptr, texture_unit);
+      if (target == PIPE_TEXTURE_CUBE_ARRAY) {
+         /*
+          * It looks like GL wants number of cubes, d3d10.1 has it undefined?
+          * Could avoid this by passing in number of cubes instead of total
+          * number of layers (might make things easier elsewhere too).
+          */
+         LLVMValueRef six = lp_build_const_int32(gallivm, 6);
+         layers = LLVMBuildSDiv(gallivm->builder, layers, six, "");
+      }
+      size = LLVMBuildInsertElement(gallivm->builder, size, layers,
+                                    lp_build_const_int32(gallivm, dims), "");
+   }
+
+   /*
+    * d3d10 requires zero for x/y/z values (but not w, i.e. mip levels)
+    * if level is out of bounds (note this can't cover unbound texture
+    * here, which also requires returning zero).
+    */
+   if (explicit_lod && is_sviewinfo) {
+      LLVMValueRef last_level, out, out1;
+      struct lp_build_context leveli_bld;
+
+      /* everything is scalar for now */
+      lp_build_context_init(&leveli_bld, gallivm, lp_type_int_vec(32, 32));
+      last_level = dynamic_state->last_level(dynamic_state, gallivm,
+                                             context_ptr, texture_unit);
+
+      out = lp_build_cmp(&leveli_bld, PIPE_FUNC_LESS, level, first_level);
+      out1 = lp_build_cmp(&leveli_bld, PIPE_FUNC_GREATER, level, last_level);
+      out = lp_build_or(&leveli_bld, out, out1);
+      if (num_lods == 1) {
+         out = lp_build_broadcast_scalar(&bld_int_vec4, out);
+      }
+      else {
+         /* TODO */
+         assert(0);
+      }
+      size = lp_build_andnot(&bld_int_vec4, size, out);
+   }
+   for (i = 0; i < dims + (has_array ? 1 : 0); i++) {
+      sizes_out[i] = lp_build_extract_broadcast(gallivm, bld_int_vec4.type, int_type,
+                                                size,
+                                                lp_build_const_int32(gallivm, i));
+   }
+   if (is_sviewinfo) {
+      for (; i < 4; i++) {
+         sizes_out[i] = lp_build_const_vec(gallivm, int_type, 0.0);
+      }
+   }
+
+   /*
+    * if there's no explicit_lod (buffers, rects) queries requiring nr of
+    * mips would be illegal.
+    */
+   if (is_sviewinfo && explicit_lod) {
+      struct lp_build_context bld_int_scalar;
+      LLVMValueRef num_levels;
+      lp_build_context_init(&bld_int_scalar, gallivm, lp_type_int(32));
+
+      if (static_state->level_zero_only) {
+         num_levels = bld_int_scalar.one;
+      }
+      else {
+         LLVMValueRef last_level;
+
+         last_level = dynamic_state->last_level(dynamic_state, gallivm,
+                                                context_ptr, texture_unit);
+         num_levels = lp_build_sub(&bld_int_scalar, last_level, first_level);
+         num_levels = lp_build_add(&bld_int_scalar, num_levels, bld_int_scalar.one);
+      }
+      sizes_out[3] = lp_build_broadcast(gallivm, lp_build_vec_type(gallivm, int_type),
+                                        num_levels);
+   }
+}