Import Mesa 18.3.2

1 files changed, 184 insertions, 0 deletions

diff --git a/lib/mesa/src/compiler/glsl/gl_nir_lower_samplers.c b/lib/mesa/src/compiler/glsl/gl_nir_lower_samplers.c
new file mode 100644
index 000000000..1ee075cfd
--- /dev/null
+++ b/lib/mesa/src/compiler/glsl/gl_nir_lower_samplers.c
@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2005-2007  Brian Paul   All Rights Reserved.
+ * Copyright (C) 2008  VMware, Inc.   All Rights Reserved.
+ * Copyright © 2014 Intel Corporation
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+#include "compiler/nir/nir.h"
+#include "compiler/nir/nir_builder.h"
+#include "gl_nir.h"
+#include "ir_uniform.h"
+
+#include "main/compiler.h"
+#include "main/mtypes.h"
+
+static void
+lower_tex_src_to_offset(nir_builder *b,
+                        nir_tex_instr *instr, unsigned src_idx,
+                        const struct gl_shader_program *shader_program)
+{
+   nir_ssa_def *index = NULL;
+   unsigned base_index = 0;
+   unsigned array_elements = 1;
+   nir_tex_src *src = &instr->src[src_idx];
+   bool is_sampler = src->src_type == nir_tex_src_sampler_deref;
+   unsigned location = 0;
+
+   /* We compute first the offsets */
+   nir_deref_instr *deref = nir_instr_as_deref(src->src.ssa->parent_instr);
+   while (deref->deref_type != nir_deref_type_var) {
+      assert(deref->parent.is_ssa);
+      nir_deref_instr *parent =
+         nir_instr_as_deref(deref->parent.ssa->parent_instr);
+
+      switch (deref->deref_type) {
+      case nir_deref_type_struct:
+         location += glsl_get_record_location_offset(parent->type,
+                                                     deref->strct.index);
+         break;
+
+      case nir_deref_type_array: {
+         if (nir_src_is_const(deref->arr.index) && index == NULL) {
+            /* We're still building a direct index */
+            base_index += nir_src_as_uint(deref->arr.index) * array_elements;
+         } else {
+            if (index == NULL) {
+               /* We used to be direct but not anymore */
+               index = nir_imm_int(b, base_index);
+               base_index = 0;
+            }
+
+            index = nir_iadd(b, index,
+                             nir_imul(b, nir_imm_int(b, array_elements),
+                                      nir_ssa_for_src(b, deref->arr.index, 1)));
+         }
+
+         array_elements *= glsl_get_length(parent->type);
+         break;
+      }
+
+      default:
+         unreachable("Invalid sampler deref type");
+      }
+
+      deref = parent;
+   }
+
+   if (index)
+      index = nir_umin(b, index, nir_imm_int(b, array_elements - 1));
+
+   /* We hit the deref_var.  This is the end of the line */
+   assert(deref->deref_type == nir_deref_type_var);
+
+   location += deref->var->data.location;
+
+   gl_shader_stage stage = b->shader->info.stage;
+   assert(location < shader_program->data->NumUniformStorage &&
+          shader_program->data->UniformStorage[location].opaque[stage].active);
+
+   base_index +=
+      shader_program->data->UniformStorage[location].opaque[stage].index;
+
+   /* We have the offsets, we apply them, rewriting the source or removing
+    * instr if needed
+    */
+   if (index) {
+      nir_instr_rewrite_src(&instr->instr, &src->src,
+                            nir_src_for_ssa(index));
+
+      src->src_type = is_sampler ?
+         nir_tex_src_sampler_offset :
+         nir_tex_src_texture_offset;
+
+      instr->texture_array_size = array_elements;
+   } else {
+      nir_tex_instr_remove_src(instr, src_idx);
+   }
+
+   if (is_sampler) {
+      instr->sampler_index = base_index;
+   } else {
+      instr->texture_index = base_index;
+      instr->texture_array_size = array_elements;
+   }
+}
+
+static bool
+lower_sampler(nir_builder *b, nir_tex_instr *instr,
+              const struct gl_shader_program *shader_program)
+{
+   int texture_idx =
+      nir_tex_instr_src_index(instr, nir_tex_src_texture_deref);
+
+   if (texture_idx >= 0) {
+      b->cursor = nir_before_instr(&instr->instr);
+
+      lower_tex_src_to_offset(b, instr, texture_idx,
+                              shader_program);
+   }
+
+   int sampler_idx =
+      nir_tex_instr_src_index(instr, nir_tex_src_sampler_deref);
+
+   if (sampler_idx >= 0) {
+      lower_tex_src_to_offset(b, instr, sampler_idx,
+                              shader_program);
+   }
+
+   if (texture_idx < 0 && sampler_idx < 0)
+      return false;
+
+   return true;
+}
+
+static bool
+lower_impl(nir_function_impl *impl,
+           const struct gl_shader_program *shader_program)
+{
+   nir_builder b;
+   nir_builder_init(&b, impl);
+   bool progress = false;
+
+   nir_foreach_block(block, impl) {
+      nir_foreach_instr(instr, block) {
+         if (instr->type == nir_instr_type_tex)
+            progress |= lower_sampler(&b, nir_instr_as_tex(instr),
+                                      shader_program);
+      }
+   }
+
+   return progress;
+}
+
+bool
+gl_nir_lower_samplers(nir_shader *shader,
+                      const struct gl_shader_program *shader_program)
+{
+   bool progress = false;
+
+   nir_foreach_function(function, shader) {
+      if (function->impl)
+         progress |= lower_impl(function->impl, shader_program);
+   }
+
+   return progress;
+}