import Mesa 11.0.6

1 files changed, 1206 insertions, 0 deletions

diff --git a/lib/mesa/src/gallium/drivers/r300/r300_render.c b/lib/mesa/src/gallium/drivers/r300/r300_render.c
new file mode 100644
index 000000000..0487b11e7
--- /dev/null
+++ b/lib/mesa/src/gallium/drivers/r300/r300_render.c
@@ -0,0 +1,1206 @@
+/*
+ * Copyright 2009 Corbin Simpson <MostAwesomeDude@gmail.com>
+ * Copyright 2010 Marek Olšák <maraeo@gmail.com>
+ *
+ * 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
+ * on 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
+ * THE AUTHOR(S) AND/OR THEIR 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. */
+
+/* r300_render: Vertex and index buffer primitive emission. Contains both
+ * HW TCL fastpath rendering, and SW TCL Draw-assisted rendering. */
+
+#include "draw/draw_context.h"
+#include "draw/draw_vbuf.h"
+
+#include "util/u_inlines.h"
+
+#include "util/u_format.h"
+#include "util/u_memory.h"
+#include "util/u_upload_mgr.h"
+#include "util/u_prim.h"
+
+#include "r300_cs.h"
+#include "r300_context.h"
+#include "r300_screen_buffer.h"
+#include "r300_emit.h"
+#include "r300_reg.h"
+
+#include <limits.h>
+
+#define IMMD_DWORDS 32
+
+static uint32_t r300_translate_primitive(unsigned prim)
+{
+    static const int prim_conv[] = {
+        R300_VAP_VF_CNTL__PRIM_POINTS,
+        R300_VAP_VF_CNTL__PRIM_LINES,
+        R300_VAP_VF_CNTL__PRIM_LINE_LOOP,
+        R300_VAP_VF_CNTL__PRIM_LINE_STRIP,
+        R300_VAP_VF_CNTL__PRIM_TRIANGLES,
+        R300_VAP_VF_CNTL__PRIM_TRIANGLE_STRIP,
+        R300_VAP_VF_CNTL__PRIM_TRIANGLE_FAN,
+        R300_VAP_VF_CNTL__PRIM_QUADS,
+        R300_VAP_VF_CNTL__PRIM_QUAD_STRIP,
+        R300_VAP_VF_CNTL__PRIM_POLYGON,
+        -1,
+        -1,
+        -1,
+        -1
+    };
+    unsigned hwprim = prim_conv[prim];
+
+    assert(hwprim != -1);
+    return hwprim;
+}
+
+static uint32_t r300_provoking_vertex_fixes(struct r300_context *r300,
+                                            unsigned mode)
+{
+    struct r300_rs_state* rs = (struct r300_rs_state*)r300->rs_state.state;
+    uint32_t color_control = rs->color_control;
+
+    /* By default (see r300_state.c:r300_create_rs_state) color_control is
+     * initialized to provoking the first vertex.
+     *
+     * Triangle fans must be reduced to the second vertex, not the first, in
+     * Gallium flatshade-first mode, as per the GL spec.
+     * (http://www.opengl.org/registry/specs/ARB/provoking_vertex.txt)
+     *
+     * Quads never provoke correctly in flatshade-first mode. The first
+     * vertex is never considered as provoking, so only the second, third,
+     * and fourth vertices can be selected, and both "third" and "last" modes
+     * select the fourth vertex. This is probably due to D3D lacking quads.
+     *
+     * Similarly, polygons reduce to the first, not the last, vertex, when in
+     * "last" mode, and all other modes start from the second vertex.
+     *
+     * ~ C.
+     */
+
+    if (rs->rs.flatshade_first) {
+        switch (mode) {
+            case PIPE_PRIM_TRIANGLE_FAN:
+                color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_SECOND;
+                break;
+            case PIPE_PRIM_QUADS:
+            case PIPE_PRIM_QUAD_STRIP:
+            case PIPE_PRIM_POLYGON:
+                color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_LAST;
+                break;
+            default:
+                color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_FIRST;
+                break;
+        }
+    } else {
+        color_control |= R300_GA_COLOR_CONTROL_PROVOKING_VERTEX_LAST;
+    }
+
+    return color_control;
+}
+
+void r500_emit_index_bias(struct r300_context *r300, int index_bias)
+{
+    CS_LOCALS(r300);
+
+    BEGIN_CS(2);
+    OUT_CS_REG(R500_VAP_INDEX_OFFSET,
+               (index_bias & 0xFFFFFF) | (index_bias < 0 ? 1<<24 : 0));
+    END_CS;
+}
+
+static void r300_emit_draw_init(struct r300_context *r300, unsigned mode,
+                                unsigned max_index)
+{
+    CS_LOCALS(r300);
+
+    assert(max_index < (1 << 24));
+
+    BEGIN_CS(5);
+    OUT_CS_REG(R300_GA_COLOR_CONTROL,
+            r300_provoking_vertex_fixes(r300, mode));
+    OUT_CS_REG_SEQ(R300_VAP_VF_MAX_VTX_INDX, 2);
+    OUT_CS(max_index);
+    OUT_CS(0);
+    END_CS;
+}
+
+/* This function splits the index bias value into two parts:
+ * - buffer_offset: the value that can be safely added to buffer offsets
+ *   in r300_emit_vertex_arrays (it must yield a positive offset when added to
+ *   a vertex buffer offset)
+ * - index_offset: the value that must be manually subtracted from indices
+ *   in an index buffer to achieve negative offsets. */
+static void r300_split_index_bias(struct r300_context *r300, int index_bias,
+                                  int *buffer_offset, int *index_offset)
+{
+    struct pipe_vertex_buffer *vb, *vbufs = r300->vertex_buffer;
+    struct pipe_vertex_element *velem = r300->velems->velem;
+    unsigned i, size;
+    int max_neg_bias;
+
+    if (index_bias < 0) {
+        /* See how large index bias we may subtract. We must be careful
+         * here because negative buffer offsets are not allowed
+         * by the DRM API. */
+        max_neg_bias = INT_MAX;
+        for (i = 0; i < r300->velems->count; i++) {
+            vb = &vbufs[velem[i].vertex_buffer_index];
+            size = (vb->buffer_offset + velem[i].src_offset) / vb->stride;
+            max_neg_bias = MIN2(max_neg_bias, size);
+        }
+
+        /* Now set the minimum allowed value. */
+        *buffer_offset = MAX2(-max_neg_bias, index_bias);
+    } else {
+        /* A positive index bias is OK. */
+        *buffer_offset = index_bias;
+    }
+
+    *index_offset = index_bias - *buffer_offset;
+}
+
+enum r300_prepare_flags {
+    PREP_EMIT_STATES    = (1 << 0), /* call emit_dirty_state and friends? */
+    PREP_VALIDATE_VBOS  = (1 << 1), /* validate VBOs? */
+    PREP_EMIT_VARRAYS       = (1 << 2), /* call emit_vertex_arrays? */
+    PREP_EMIT_VARRAYS_SWTCL = (1 << 3), /* call emit_vertex_arrays_swtcl? */
+    PREP_INDEXED        = (1 << 4)  /* is this draw_elements? */
+};
+
+/**
+ * Check if the requested number of dwords is available in the CS and
+ * if not, flush.
+ * \param r300          The context.
+ * \param flags         See r300_prepare_flags.
+ * \param cs_dwords     The number of dwords to reserve in CS.
+ * \return TRUE if the CS was flushed
+ */
+static boolean r300_reserve_cs_dwords(struct r300_context *r300,
+                                      enum r300_prepare_flags flags,
+                                      unsigned cs_dwords)
+{
+    boolean flushed        = FALSE;
+    boolean emit_states    = flags & PREP_EMIT_STATES;
+    boolean emit_vertex_arrays       = flags & PREP_EMIT_VARRAYS;
+    boolean emit_vertex_arrays_swtcl = flags & PREP_EMIT_VARRAYS_SWTCL;
+
+    /* Add dirty state, index offset, and AOS. */
+    if (emit_states)
+        cs_dwords += r300_get_num_dirty_dwords(r300);
+
+    if (r300->screen->caps.is_r500)
+        cs_dwords += 2; /* emit_index_offset */
+
+    if (emit_vertex_arrays)
+        cs_dwords += 55; /* emit_vertex_arrays */
+
+    if (emit_vertex_arrays_swtcl)
+        cs_dwords += 7; /* emit_vertex_arrays_swtcl */
+
+    cs_dwords += r300_get_num_cs_end_dwords(r300);
+
+    /* Reserve requested CS space. */
+    if (cs_dwords > (r300->cs->max_dw - r300->cs->cdw)) {
+        r300_flush(&r300->context, RADEON_FLUSH_ASYNC, NULL);
+        flushed = TRUE;
+    }
+
+    return flushed;
+}
+
+/**
+ * Validate buffers and emit dirty state.
+ * \param r300          The context.
+ * \param flags         See r300_prepare_flags.
+ * \param index_buffer  The index buffer to validate. The parameter may be NULL.
+ * \param buffer_offset The offset passed to emit_vertex_arrays.
+ * \param index_bias    The index bias to emit.
+ * \param instance_id   Index of instance to render
+ * \return TRUE if rendering should be skipped
+ */
+static boolean r300_emit_states(struct r300_context *r300,
+                                enum r300_prepare_flags flags,
+                                struct pipe_resource *index_buffer,
+                                int buffer_offset,
+                                int index_bias, int instance_id)
+{
+    boolean emit_states    = flags & PREP_EMIT_STATES;
+    boolean emit_vertex_arrays       = flags & PREP_EMIT_VARRAYS;
+    boolean emit_vertex_arrays_swtcl = flags & PREP_EMIT_VARRAYS_SWTCL;
+    boolean indexed        = flags & PREP_INDEXED;
+    boolean validate_vbos  = flags & PREP_VALIDATE_VBOS;
+
+    /* Validate buffers and emit dirty state if needed. */
+    if (emit_states || (emit_vertex_arrays && validate_vbos)) {
+        if (!r300_emit_buffer_validate(r300, validate_vbos,
+                                       index_buffer)) {
+           fprintf(stderr, "r300: CS space validation failed. "
+                   "(not enough memory?) Skipping rendering.\n");
+           return FALSE;
+        }
+    }
+
+    if (emit_states)
+        r300_emit_dirty_state(r300);
+
+    if (r300->screen->caps.is_r500) {
+        if (r300->screen->caps.has_tcl)
+            r500_emit_index_bias(r300, index_bias);
+        else
+            r500_emit_index_bias(r300, 0);
+    }
+
+    if (emit_vertex_arrays &&
+        (r300->vertex_arrays_dirty ||
+         r300->vertex_arrays_indexed != indexed ||
+         r300->vertex_arrays_offset != buffer_offset ||
+         r300->vertex_arrays_instance_id != instance_id)) {
+        r300_emit_vertex_arrays(r300, buffer_offset, indexed, instance_id);
+
+        r300->vertex_arrays_dirty = FALSE;
+        r300->vertex_arrays_indexed = indexed;
+        r300->vertex_arrays_offset = buffer_offset;
+        r300->vertex_arrays_instance_id = instance_id;
+    }
+
+    if (emit_vertex_arrays_swtcl)
+        r300_emit_vertex_arrays_swtcl(r300, indexed);
+
+    return TRUE;
+}
+
+/**
+ * Check if the requested number of dwords is available in the CS and
+ * if not, flush. Then validate buffers and emit dirty state.
+ * \param r300          The context.
+ * \param flags         See r300_prepare_flags.
+ * \param index_buffer  The index buffer to validate. The parameter may be NULL.
+ * \param cs_dwords     The number of dwords to reserve in CS.
+ * \param buffer_offset The offset passed to emit_vertex_arrays.
+ * \param index_bias    The index bias to emit.
+ * \param instance_id The instance to render.
+ * \return TRUE if rendering should be skipped
+ */
+static boolean r300_prepare_for_rendering(struct r300_context *r300,
+                                          enum r300_prepare_flags flags,
+                                          struct pipe_resource *index_buffer,
+                                          unsigned cs_dwords,
+                                          int buffer_offset,
+                                          int index_bias,
+                                          int instance_id)
+{
+    /* Make sure there is enough space in the command stream and emit states. */
+    if (r300_reserve_cs_dwords(r300, flags, cs_dwords))
+        flags |= PREP_EMIT_STATES;
+
+    return r300_emit_states(r300, flags, index_buffer, buffer_offset,
+                            index_bias, instance_id);
+}
+
+static boolean immd_is_good_idea(struct r300_context *r300,
+                                 unsigned count)
+{
+    if (DBG_ON(r300, DBG_NO_IMMD)) {
+        return FALSE;
+    }
+
+    if (count * r300->velems->vertex_size_dwords > IMMD_DWORDS) {
+        return FALSE;
+    }
+
+    /* Buffers can only be used for read by r300 (except query buffers, but
+     * those can't be bound by a state tracker as vertex buffers). */
+    return TRUE;
+}
+
+/*****************************************************************************
+ * The HWTCL draw functions.                                                 *
+ ****************************************************************************/
+
+static void r300_draw_arrays_immediate(struct r300_context *r300,
+                                       const struct pipe_draw_info *info)
+{
+    struct pipe_vertex_element* velem;
+    struct pipe_vertex_buffer* vbuf;
+    unsigned vertex_element_count = r300->velems->count;
+    unsigned i, v, vbi;
+
+    /* Size of the vertex, in dwords. */
+    unsigned vertex_size = r300->velems->vertex_size_dwords;
+
+    /* The number of dwords for this draw operation. */
+    unsigned dwords = 4 + info->count * vertex_size;
+
+    /* Size of the vertex element, in dwords. */
+    unsigned size[PIPE_MAX_ATTRIBS];
+
+    /* Stride to the same attrib in the next vertex in the vertex buffer,
+     * in dwords. */
+    unsigned stride[PIPE_MAX_ATTRIBS];
+
+    /* Mapped vertex buffers. */
+    uint32_t* map[PIPE_MAX_ATTRIBS] = {0};
+    uint32_t* mapelem[PIPE_MAX_ATTRIBS];
+
+    CS_LOCALS(r300);
+
+    if (!r300_prepare_for_rendering(r300, PREP_EMIT_STATES, NULL, dwords, 0, 0, -1))
+        return;
+
+    /* Calculate the vertex size, offsets, strides etc. and map the buffers. */
+    for (i = 0; i < vertex_element_count; i++) {
+        velem = &r300->velems->velem[i];
+        size[i] = r300->velems->format_size[i] / 4;
+        vbi = velem->vertex_buffer_index;
+        vbuf = &r300->vertex_buffer[vbi];
+        stride[i] = vbuf->stride / 4;
+
+        /* Map the buffer. */
+        if (!map[vbi]) {
+            map[vbi] = (uint32_t*)r300->rws->buffer_map(
+                r300_resource(vbuf->buffer)->cs_buf,
+                r300->cs, PIPE_TRANSFER_READ | PIPE_TRANSFER_UNSYNCHRONIZED);
+            map[vbi] += (vbuf->buffer_offset / 4) + stride[i] * info->start;
+        }
+        mapelem[i] = map[vbi] + (velem->src_offset / 4);
+    }
+
+    r300_emit_draw_init(r300, info->mode, info->count-1);
+
+    BEGIN_CS(dwords);
+    OUT_CS_REG(R300_VAP_VTX_SIZE, vertex_size);
+    OUT_CS_PKT3(R300_PACKET3_3D_DRAW_IMMD_2, info->count * vertex_size);
+    OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_EMBEDDED | (info->count << 16) |
+            r300_translate_primitive(info->mode));
+
+    /* Emit vertices. */
+    for (v = 0; v < info->count; v++) {
+        for (i = 0; i < vertex_element_count; i++) {
+            OUT_CS_TABLE(&mapelem[i][stride[i] * v], size[i]);
+        }
+    }
+    END_CS;
+}
+
+static void r300_emit_draw_arrays(struct r300_context *r300,
+                                  unsigned mode,
+                                  unsigned count)
+{
+    boolean alt_num_verts = count > 65535;
+    CS_LOCALS(r300);
+
+    if (count >= (1 << 24)) {
+        fprintf(stderr, "r300: Got a huge number of vertices: %i, "
+                "refusing to render.\n", count);
+        return;
+    }
+
+    r300_emit_draw_init(r300, mode, count-1);
+
+    BEGIN_CS(2 + (alt_num_verts ? 2 : 0));
+    if (alt_num_verts) {
+        OUT_CS_REG(R500_VAP_ALT_NUM_VERTICES, count);
+    }
+    OUT_CS_PKT3(R300_PACKET3_3D_DRAW_VBUF_2, 0);
+    OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_LIST | (count << 16) |
+           r300_translate_primitive(mode) |
+           (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0));
+    END_CS;
+}
+
+static void r300_emit_draw_elements(struct r300_context *r300,
+                                    struct pipe_resource* indexBuffer,
+                                    unsigned indexSize,
+                                    unsigned max_index,
+                                    unsigned mode,
+                                    unsigned start,
+                                    unsigned count,
+                                    uint16_t *imm_indices3)
+{
+    uint32_t count_dwords, offset_dwords;
+    boolean alt_num_verts = count > 65535;
+    CS_LOCALS(r300);
+
+    if (count >= (1 << 24)) {
+        fprintf(stderr, "r300: Got a huge number of vertices: %i, "
+                "refusing to render (max_index: %i).\n", count, max_index);
+        return;
+    }
+
+    DBG(r300, DBG_DRAW, "r300: Indexbuf of %u indices, max %u\n",
+        count, max_index);
+
+    r300_emit_draw_init(r300, mode, max_index);
+
+    /* If start is odd, render the first triangle with indices embedded
+     * in the command stream. This will increase start by 3 and make it
+     * even. We can then proceed without a fallback. */
+    if (indexSize == 2 && (start & 1) &&
+        mode == PIPE_PRIM_TRIANGLES) {
+        BEGIN_CS(4);
+        OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, 2);
+        OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (3 << 16) |
+               R300_VAP_VF_CNTL__PRIM_TRIANGLES);
+        OUT_CS(imm_indices3[1] << 16 | imm_indices3[0]);
+        OUT_CS(imm_indices3[2]);
+        END_CS;
+
+        start += 3;
+        count -= 3;
+        if (!count)
+           return;
+    }
+
+    offset_dwords = indexSize * start / sizeof(uint32_t);
+
+    BEGIN_CS(8 + (alt_num_verts ? 2 : 0));
+    if (alt_num_verts) {
+        OUT_CS_REG(R500_VAP_ALT_NUM_VERTICES, count);
+    }
+    OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, 0);
+    if (indexSize == 4) {
+        count_dwords = count;
+        OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) |
+               R300_VAP_VF_CNTL__INDEX_SIZE_32bit |
+               r300_translate_primitive(mode) |
+               (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0));
+    } else {
+        count_dwords = (count + 1) / 2;
+        OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) |
+               r300_translate_primitive(mode) |
+               (alt_num_verts ? R500_VAP_VF_CNTL__USE_ALT_NUM_VERTS : 0));
+    }
+
+    OUT_CS_PKT3(R300_PACKET3_INDX_BUFFER, 2);
+    OUT_CS(R300_INDX_BUFFER_ONE_REG_WR | (R300_VAP_PORT_IDX0 >> 2) |
+           (0 << R300_INDX_BUFFER_SKIP_SHIFT));
+    OUT_CS(offset_dwords << 2);
+    OUT_CS(count_dwords);
+    OUT_CS_RELOC(r300_resource(indexBuffer));
+    END_CS;
+}
+
+static void r300_draw_elements_immediate(struct r300_context *r300,
+                                         const struct pipe_draw_info *info)
+{
+    const uint8_t *ptr1;
+    const uint16_t *ptr2;
+    const uint32_t *ptr4;
+    unsigned index_size = r300->index_buffer.index_size;
+    unsigned i, count_dwords = index_size == 4 ? info->count :
+                                                 (info->count + 1) / 2;
+    CS_LOCALS(r300);
+
+    /* 19 dwords for r300_draw_elements_immediate. Give up if the function fails. */
+    if (!r300_prepare_for_rendering(r300,
+            PREP_EMIT_STATES | PREP_VALIDATE_VBOS | PREP_EMIT_VARRAYS |
+            PREP_INDEXED, NULL, 2+count_dwords, 0, info->index_bias, -1))
+        return;
+
+    r300_emit_draw_init(r300, info->mode, info->max_index);
+
+    BEGIN_CS(2 + count_dwords);
+    OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, count_dwords);
+
+    switch (index_size) {
+    case 1:
+        ptr1 = (uint8_t*)r300->index_buffer.user_buffer;
+        ptr1 += info->start;
+
+        OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (info->count << 16) |
+               r300_translate_primitive(info->mode));
+
+        if (info->index_bias && !r300->screen->caps.is_r500) {
+            for (i = 0; i < info->count-1; i += 2)
+                OUT_CS(((ptr1[i+1] + info->index_bias) << 16) |
+                        (ptr1[i]   + info->index_bias));
+
+            if (info->count & 1)
+                OUT_CS(ptr1[i] + info->index_bias);
+        } else {
+            for (i = 0; i < info->count-1; i += 2)
+                OUT_CS(((ptr1[i+1]) << 16) |
+                        (ptr1[i]  ));
+
+            if (info->count & 1)
+                OUT_CS(ptr1[i]);
+        }
+        break;
+
+    case 2:
+        ptr2 = (uint16_t*)r300->index_buffer.user_buffer;
+        ptr2 += info->start;
+
+        OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (info->count << 16) |
+               r300_translate_primitive(info->mode));
+
+        if (info->index_bias && !r300->screen->caps.is_r500) {
+            for (i = 0; i < info->count-1; i += 2)
+                OUT_CS(((ptr2[i+1] + info->index_bias) << 16) |
+                        (ptr2[i]   + info->index_bias));
+
+            if (info->count & 1)
+                OUT_CS(ptr2[i] + info->index_bias);
+        } else {
+            OUT_CS_TABLE(ptr2, count_dwords);
+        }
+        break;
+
+    case 4:
+        ptr4 = (uint32_t*)r300->index_buffer.user_buffer;
+        ptr4 += info->start;
+
+        OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (info->count << 16) |
+               R300_VAP_VF_CNTL__INDEX_SIZE_32bit |
+               r300_translate_primitive(info->mode));
+
+        if (info->index_bias && !r300->screen->caps.is_r500) {
+            for (i = 0; i < info->count; i++)
+                OUT_CS(ptr4[i] + info->index_bias);
+        } else {
+            OUT_CS_TABLE(ptr4, count_dwords);
+        }
+        break;
+    }
+    END_CS;
+}
+
+static void r300_draw_elements(struct r300_context *r300,
+                               const struct pipe_draw_info *info,
+                               int instance_id)
+{
+    struct pipe_resource *indexBuffer = r300->index_buffer.buffer;
+    unsigned indexSize = r300->index_buffer.index_size;
+    struct pipe_resource* orgIndexBuffer = indexBuffer;
+    unsigned start = info->start;
+    unsigned count = info->count;
+    boolean alt_num_verts = r300->screen->caps.is_r500 &&
+                            count > 65536;
+    unsigned short_count;
+    int buffer_offset = 0, index_offset = 0; /* for index bias emulation */
+    uint16_t indices3[3];
+
+    if (info->index_bias && !r300->screen->caps.is_r500) {
+        r300_split_index_bias(r300, info->index_bias, &buffer_offset,
+                              &index_offset);
+    }
+
+    r300_translate_index_buffer(r300, &r300->index_buffer, &indexBuffer,
+                                &indexSize, index_offset, &start, count);
+
+    /* Fallback for misaligned ushort indices. */
+    if (indexSize == 2 && (start & 1) && indexBuffer) {
+        /* If we got here, then orgIndexBuffer == indexBuffer. */
+        uint16_t *ptr = r300->rws->buffer_map(r300_resource(orgIndexBuffer)->cs_buf,
+                                              r300->cs,
+                                              PIPE_TRANSFER_READ |
+                                              PIPE_TRANSFER_UNSYNCHRONIZED);
+
+        if (info->mode == PIPE_PRIM_TRIANGLES) {
+           memcpy(indices3, ptr + start, 6);
+        } else {
+            /* Copy the mapped index buffer directly to the upload buffer.
+             * The start index will be aligned simply from the fact that
+             * every sub-buffer in the upload buffer is aligned. */
+            r300_upload_index_buffer(r300, &indexBuffer, indexSize, &start,
+                                     count, (uint8_t*)ptr);
+        }
+    } else {
+        if (r300->index_buffer.user_buffer)
+            r300_upload_index_buffer(r300, &indexBuffer, indexSize,
+                                     &start, count,
+                                     r300->index_buffer.user_buffer);
+    }
+
+    /* 19 dwords for emit_draw_elements. Give up if the function fails. */
+    if (!r300_prepare_for_rendering(r300,
+            PREP_EMIT_STATES | PREP_VALIDATE_VBOS | PREP_EMIT_VARRAYS |
+            PREP_INDEXED, indexBuffer, 19, buffer_offset, info->index_bias,
+            instance_id))
+        goto done;
+
+    if (alt_num_verts || count <= 65535) {
+        r300_emit_draw_elements(r300, indexBuffer, indexSize,
+                                info->max_index, info->mode, start, count,
+                                indices3);
+    } else {
+        do {
+            /* The maximum must be divisible by 4 and 3,
+             * so that quad and triangle lists are split correctly.
+             *
+             * Strips, loops, and fans won't work. */
+            short_count = MIN2(count, 65532);
+
+            r300_emit_draw_elements(r300, indexBuffer, indexSize,
+                                     info->max_index,
+                                     info->mode, start, short_count, indices3);
+
+            start += short_count;
+            count -= short_count;
+
+            /* 15 dwords for emit_draw_elements */
+            if (count) {
+                if (!r300_prepare_for_rendering(r300,
+                        PREP_VALIDATE_VBOS | PREP_EMIT_VARRAYS | PREP_INDEXED,
+                        indexBuffer, 19, buffer_offset, info->index_bias,
+                        instance_id))
+                    goto done;
+            }
+        } while (count);
+    }
+
+done:
+    if (indexBuffer != orgIndexBuffer) {
+        pipe_resource_reference( &indexBuffer, NULL );
+    }
+}
+
+static void r300_draw_arrays(struct r300_context *r300,
+                             const struct pipe_draw_info *info,
+                             int instance_id)
+{
+    boolean alt_num_verts = r300->screen->caps.is_r500 &&
+                            info->count > 65536;
+    unsigned start = info->start;
+    unsigned count = info->count;
+    unsigned short_count;
+
+    /* 9 spare dwords for emit_draw_arrays. Give up if the function fails. */
+    if (!r300_prepare_for_rendering(r300,
+                                    PREP_EMIT_STATES | PREP_VALIDATE_VBOS | PREP_EMIT_VARRAYS,
+                                    NULL, 9, start, 0, instance_id))
+        return;
+
+    if (alt_num_verts || count <= 65535) {
+        r300_emit_draw_arrays(r300, info->mode, count);
+    } else {
+        do {
+            /* The maximum must be divisible by 4 and 3,
+             * so that quad and triangle lists are split correctly.
+             *
+             * Strips, loops, and fans won't work. */
+            short_count = MIN2(count, 65532);
+            r300_emit_draw_arrays(r300, info->mode, short_count);
+
+            start += short_count;
+            count -= short_count;
+
+            /* 9 spare dwords for emit_draw_arrays. Give up if the function fails. */
+            if (count) {
+                if (!r300_prepare_for_rendering(r300,
+                                                PREP_VALIDATE_VBOS | PREP_EMIT_VARRAYS, NULL, 9,
+                                                start, 0, instance_id))
+                    return;
+            }
+        } while (count);
+    }
+}
+
+static void r300_draw_arrays_instanced(struct r300_context *r300,
+                                       const struct pipe_draw_info *info)
+{
+    int i;
+
+    for (i = 0; i < info->instance_count; i++)
+        r300_draw_arrays(r300, info, i);
+}
+
+static void r300_draw_elements_instanced(struct r300_context *r300,
+                                         const struct pipe_draw_info *info)
+{
+    int i;
+
+    for (i = 0; i < info->instance_count; i++)
+        r300_draw_elements(r300, info, i);
+}
+
+static unsigned r300_max_vertex_count(struct r300_context *r300)
+{
+   unsigned i, nr = r300->velems->count;
+   struct pipe_vertex_element *velems = r300->velems->velem;
+   unsigned result = ~0;
+
+   for (i = 0; i < nr; i++) {
+      struct pipe_vertex_buffer *vb =
+            &r300->vertex_buffer[velems[i].vertex_buffer_index];
+      unsigned size, max_count, value;
+
+      /* We're not interested in constant and per-instance attribs. */
+      if (!vb->buffer ||
+          !vb->stride ||
+          velems[i].instance_divisor) {
+         continue;
+      }
+
+      size = vb->buffer->width0;
+
+      /* Subtract buffer_offset. */
+      value = vb->buffer_offset;
+      if (value >= size) {
+         return 0;
+      }
+      size -= value;
+
+      /* Subtract src_offset. */
+      value = velems[i].src_offset;
+      if (value >= size) {
+         return 0;
+      }
+      size -= value;
+
+      /* Subtract format_size. */
+      value = r300->velems->format_size[i];
+      if (value >= size) {
+         return 0;
+      }
+      size -= value;
+
+      /* Compute the max count. */
+      max_count = 1 + size / vb->stride;
+      result = MIN2(result, max_count);
+   }
+   return result;
+}
+
+
+static void r300_draw_vbo(struct pipe_context* pipe,
+                          const struct pipe_draw_info *dinfo)
+{
+    struct r300_context* r300 = r300_context(pipe);
+    struct pipe_draw_info info = *dinfo;
+
+    if (r300->skip_rendering ||
+        !u_trim_pipe_prim(info.mode, &info.count)) {
+        return;
+    }
+
+    r300_update_derived_state(r300);
+
+    /* Draw. */
+    if (info.indexed) {
+        unsigned max_count = r300_max_vertex_count(r300);
+
+        if (!max_count) {
+           fprintf(stderr, "r300: Skipping a draw command. There is a buffer "
+                   " which is too small to be used for rendering.\n");
+           return;
+        }
+
+        if (max_count == ~0) {
+           /* There are no per-vertex vertex elements. Use the hardware maximum. */
+           max_count = 0xffffff;
+        }
+
+        info.max_index = max_count - 1;
+        info.start += r300->index_buffer.offset / r300->index_buffer.index_size;
+
+        if (info.instance_count <= 1) {
+            if (info.count <= 8 &&
+                r300->index_buffer.user_buffer) {
+                r300_draw_elements_immediate(r300, &info);
+            } else {
+                r300_draw_elements(r300, &info, -1);
+            }
+        } else {
+            r300_draw_elements_instanced(r300, &info);
+        }
+    } else {
+        if (info.instance_count <= 1) {
+            if (immd_is_good_idea(r300, info.count)) {
+                r300_draw_arrays_immediate(r300, &info);
+            } else {
+                r300_draw_arrays(r300, &info, -1);
+            }
+        } else {
+            r300_draw_arrays_instanced(r300, &info);
+        }
+    }
+}
+
+/****************************************************************************
+ * The rest of this file is for SW TCL rendering only. Please be polite and *
+ * keep these functions separated so that they are easier to locate. ~C.    *
+ ***************************************************************************/
+
+/* SW TCL elements, using Draw. */
+static void r300_swtcl_draw_vbo(struct pipe_context* pipe,
+                                const struct pipe_draw_info *info)
+{
+    struct r300_context* r300 = r300_context(pipe);
+
+    if (r300->skip_rendering) {
+        return;
+    }
+
+    r300_update_derived_state(r300);
+
+    draw_vbo(r300->draw, info);
+    draw_flush(r300->draw);
+}
+
+/* Object for rendering using Draw. */
+struct r300_render {
+    /* Parent class */
+    struct vbuf_render base;
+
+    /* Pipe context */
+    struct r300_context* r300;
+
+    /* Vertex information */
+    size_t vertex_size;
+    unsigned prim;
+    unsigned hwprim;
+
+    /* VBO */
+    size_t vbo_max_used;
+    uint8_t *vbo_ptr;
+};
+
+static inline struct r300_render*
+r300_render(struct vbuf_render* render)
+{
+    return (struct r300_render*)render;
+}
+
+static const struct vertex_info*
+r300_render_get_vertex_info(struct vbuf_render* render)
+{
+    struct r300_render* r300render = r300_render(render);
+    struct r300_context* r300 = r300render->r300;
+
+    return &r300->vertex_info;
+}
+
+static boolean r300_render_allocate_vertices(struct vbuf_render* render,
+                                             ushort vertex_size,
+                                             ushort count)
+{
+    struct r300_render* r300render = r300_render(render);
+    struct r300_context* r300 = r300render->r300;
+    struct radeon_winsys *rws = r300->rws;
+    size_t size = (size_t)vertex_size * (size_t)count;
+
+    DBG(r300, DBG_DRAW, "r300: render_allocate_vertices (size: %d)\n", size);
+
+    if (!r300->vbo || size + r300->draw_vbo_offset > r300->vbo->size) {
+	pb_reference(&r300->vbo, NULL);
+        r300->vbo_cs = NULL;
+        r300render->vbo_ptr = NULL;
+
+        r300->vbo = rws->buffer_create(rws,
+                                       MAX2(R300_MAX_DRAW_VBO_SIZE, size),
+                                       R300_BUFFER_ALIGNMENT, TRUE,
+                                       RADEON_DOMAIN_GTT, 0);
+        if (!r300->vbo) {
+            return FALSE;
+        }
+        r300->vbo_cs = rws->buffer_get_cs_handle(r300->vbo);
+        r300->draw_vbo_offset = 0;
+        r300render->vbo_ptr = rws->buffer_map(r300->vbo_cs, r300->cs,
+                                              PIPE_TRANSFER_WRITE);
+    }
+
+    r300render->vertex_size = vertex_size;
+    return TRUE;
+}
+
+static void* r300_render_map_vertices(struct vbuf_render* render)
+{
+    struct r300_render* r300render = r300_render(render);
+    struct r300_context* r300 = r300render->r300;
+
+    DBG(r300, DBG_DRAW, "r300: render_map_vertices\n");
+
+    assert(r300render->vbo_ptr);
+    return r300render->vbo_ptr + r300->draw_vbo_offset;
+}
+
+static void r300_render_unmap_vertices(struct vbuf_render* render,
+                                             ushort min,
+                                             ushort max)
+{
+    struct r300_render* r300render = r300_render(render);
+    struct r300_context* r300 = r300render->r300;
+
+    DBG(r300, DBG_DRAW, "r300: render_unmap_vertices\n");
+
+    r300render->vbo_max_used = MAX2(r300render->vbo_max_used,
+                                    r300render->vertex_size * (max + 1));
+}
+
+static void r300_render_release_vertices(struct vbuf_render* render)
+{
+    struct r300_render* r300render = r300_render(render);
+    struct r300_context* r300 = r300render->r300;
+
+    DBG(r300, DBG_DRAW, "r300: render_release_vertices\n");
+
+    r300->draw_vbo_offset += r300render->vbo_max_used;
+    r300render->vbo_max_used = 0;
+}
+
+static void r300_render_set_primitive(struct vbuf_render* render,
+                                      unsigned prim)
+{
+    struct r300_render* r300render = r300_render(render);
+
+    r300render->prim = prim;
+    r300render->hwprim = r300_translate_primitive(prim);
+}
+
+static void r300_render_draw_arrays(struct vbuf_render* render,
+                                    unsigned start,
+                                    unsigned count)
+{
+    struct r300_render* r300render = r300_render(render);
+    struct r300_context* r300 = r300render->r300;
+    uint8_t* ptr;
+    unsigned i;
+    unsigned dwords = 6;
+
+    CS_LOCALS(r300);
+    (void) i; (void) ptr;
+
+    assert(start == 0);
+    assert(count < (1 << 16));
+
+    DBG(r300, DBG_DRAW, "r300: render_draw_arrays (count: %d)\n", count);
+
+    if (!r300_prepare_for_rendering(r300,
+                                    PREP_EMIT_STATES | PREP_EMIT_VARRAYS_SWTCL,
+                                    NULL, dwords, 0, 0, -1)) {
+        return;
+    }
+
+    BEGIN_CS(dwords);
+    OUT_CS_REG(R300_GA_COLOR_CONTROL,
+            r300_provoking_vertex_fixes(r300, r300render->prim));
+    OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, count - 1);
+    OUT_CS_PKT3(R300_PACKET3_3D_DRAW_VBUF_2, 0);
+    OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_LIST | (count << 16) |
+           r300render->hwprim);
+    END_CS;
+}
+
+static void r300_render_draw_elements(struct vbuf_render* render,
+                                      const ushort* indices,
+                                      uint count)
+{
+    struct r300_render* r300render = r300_render(render);
+    struct r300_context* r300 = r300render->r300;
+    unsigned max_index = (r300->vbo->size - r300->draw_vbo_offset) /
+                         (r300render->r300->vertex_info.size * 4) - 1;
+    struct pipe_resource *index_buffer = NULL;
+    unsigned index_buffer_offset;
+
+    CS_LOCALS(r300);
+    DBG(r300, DBG_DRAW, "r300: render_draw_elements (count: %d)\n", count);
+
+    u_upload_data(r300->uploader, 0, count * 2, indices,
+                  &index_buffer_offset, &index_buffer);
+    if (!index_buffer) {
+        return;
+    }
+
+    if (!r300_prepare_for_rendering(r300,
+                                    PREP_EMIT_STATES |
+                                    PREP_EMIT_VARRAYS_SWTCL | PREP_INDEXED,
+                                    index_buffer, 12, 0, 0, -1)) {
+        pipe_resource_reference(&index_buffer, NULL);
+        return;
+    }
+
+    BEGIN_CS(12);
+    OUT_CS_REG(R300_GA_COLOR_CONTROL,
+               r300_provoking_vertex_fixes(r300, r300render->prim));
+    OUT_CS_REG(R300_VAP_VF_MAX_VTX_INDX, max_index);
+
+    OUT_CS_PKT3(R300_PACKET3_3D_DRAW_INDX_2, 0);
+    OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (count << 16) |
+           r300render->hwprim);
+
+    OUT_CS_PKT3(R300_PACKET3_INDX_BUFFER, 2);
+    OUT_CS(R300_INDX_BUFFER_ONE_REG_WR | (R300_VAP_PORT_IDX0 >> 2));
+    OUT_CS(index_buffer_offset);
+    OUT_CS((count + 1) / 2);
+    OUT_CS_RELOC(r300_resource(index_buffer));
+    END_CS;
+
+    pipe_resource_reference(&index_buffer, NULL);
+}
+
+static void r300_render_destroy(struct vbuf_render* render)
+{
+    FREE(render);
+}
+
+static struct vbuf_render* r300_render_create(struct r300_context* r300)
+{
+    struct r300_render* r300render = CALLOC_STRUCT(r300_render);
+
+    r300render->r300 = r300;
+
+    r300render->base.max_vertex_buffer_bytes = R300_MAX_DRAW_VBO_SIZE;
+    r300render->base.max_indices = 16 * 1024;
+
+    r300render->base.get_vertex_info = r300_render_get_vertex_info;
+    r300render->base.allocate_vertices = r300_render_allocate_vertices;
+    r300render->base.map_vertices = r300_render_map_vertices;
+    r300render->base.unmap_vertices = r300_render_unmap_vertices;
+    r300render->base.set_primitive = r300_render_set_primitive;
+    r300render->base.draw_elements = r300_render_draw_elements;
+    r300render->base.draw_arrays = r300_render_draw_arrays;
+    r300render->base.release_vertices = r300_render_release_vertices;
+    r300render->base.destroy = r300_render_destroy;
+
+    return &r300render->base;
+}
+
+struct draw_stage* r300_draw_stage(struct r300_context* r300)
+{
+    struct vbuf_render* render;
+    struct draw_stage* stage;
+
+    render = r300_render_create(r300);
+
+    if (!render) {
+        return NULL;
+    }
+
+    stage = draw_vbuf_stage(r300->draw, render);
+
+    if (!stage) {
+        render->destroy(render);
+        return NULL;
+    }
+
+    draw_set_render(r300->draw, render);
+
+    return stage;
+}
+
+/****************************************************************************
+ *                         End of SW TCL functions                          *
+ ***************************************************************************/
+
+/* This functions is used to draw a rectangle for the blitter module.
+ *
+ * If we rendered a quad, the pixels on the main diagonal
+ * would be computed and stored twice, which makes the clear/copy codepaths
+ * somewhat inefficient. Instead we use a rectangular point sprite. */
+void r300_blitter_draw_rectangle(struct blitter_context *blitter,
+                                 int x1, int y1, int x2, int y2,
+                                 float depth,
+                                 enum blitter_attrib_type type,
+                                 const union pipe_color_union *attrib)
+{
+    struct r300_context *r300 = r300_context(util_blitter_get_pipe(blitter));
+    unsigned last_sprite_coord_enable = r300->sprite_coord_enable;
+    unsigned width = x2 - x1;
+    unsigned height = y2 - y1;
+    unsigned vertex_size =
+            type == UTIL_BLITTER_ATTRIB_COLOR || !r300->draw ? 8 : 4;
+    unsigned dwords = 13 + vertex_size +
+                      (type == UTIL_BLITTER_ATTRIB_TEXCOORD ? 7 : 0);
+    static const union pipe_color_union zeros;
+    CS_LOCALS(r300);
+
+    /* XXX workaround for a lockup in MSAA resolve on SWTCL chipsets, this
+     * function most probably doesn't handle type=NONE correctly */
+    if (!r300->screen->caps.has_tcl && type == UTIL_BLITTER_ATTRIB_NONE) {
+        util_blitter_draw_rectangle(blitter, x1, y1, x2, y2, depth, type, attrib);
+        return;
+    }
+
+    if (r300->skip_rendering)
+        return;
+
+    if (type == UTIL_BLITTER_ATTRIB_TEXCOORD)
+        r300->sprite_coord_enable = 1;
+
+    r300_update_derived_state(r300);
+
+    /* Mark some states we don't care about as non-dirty. */
+    r300->viewport_state.dirty = FALSE;
+
+    if (!r300_prepare_for_rendering(r300, PREP_EMIT_STATES, NULL, dwords, 0, 0, -1))
+        goto done;
+
+    DBG(r300, DBG_DRAW, "r300: draw_rectangle\n");
+
+    BEGIN_CS(dwords);
+    /* Set up GA. */
+    OUT_CS_REG(R300_GA_POINT_SIZE, (height * 6) | ((width * 6) << 16));
+
+    if (type == UTIL_BLITTER_ATTRIB_TEXCOORD) {
+        /* Set up the GA to generate texcoords. */
+        OUT_CS_REG(R300_GB_ENABLE, R300_GB_POINT_STUFF_ENABLE |
+                   (R300_GB_TEX_STR << R300_GB_TEX0_SOURCE_SHIFT));
+        OUT_CS_REG_SEQ(R300_GA_POINT_S0, 4);
+        OUT_CS_32F(attrib->f[0]);
+        OUT_CS_32F(attrib->f[3]);
+        OUT_CS_32F(attrib->f[2]);
+        OUT_CS_32F(attrib->f[1]);
+    }
+
+    /* Set up VAP controls. */
+    OUT_CS_REG(R300_VAP_CLIP_CNTL, R300_CLIP_DISABLE);
+    OUT_CS_REG(R300_VAP_VTE_CNTL, R300_VTX_XY_FMT | R300_VTX_Z_FMT);
+    OUT_CS_REG(R300_VAP_VTX_SIZE, vertex_size);
+    OUT_CS_REG_SEQ(R300_VAP_VF_MAX_VTX_INDX, 2);
+    OUT_CS(1);
+    OUT_CS(0);
+
+    /* Draw. */
+    OUT_CS_PKT3(R300_PACKET3_3D_DRAW_IMMD_2, vertex_size);
+    OUT_CS(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_EMBEDDED | (1 << 16) |
+           R300_VAP_VF_CNTL__PRIM_POINTS);
+
+    OUT_CS_32F(x1 + width * 0.5f);
+    OUT_CS_32F(y1 + height * 0.5f);
+    OUT_CS_32F(depth);
+    OUT_CS_32F(1);
+
+    if (vertex_size == 8) {
+        if (!attrib)
+            attrib = &zeros;
+        OUT_CS_TABLE(attrib->f, 4);
+    }
+    END_CS;
+
+done:
+    /* Restore the state. */
+    r300_mark_atom_dirty(r300, &r300->rs_state);
+    r300_mark_atom_dirty(r300, &r300->viewport_state);
+
+    r300->sprite_coord_enable = last_sprite_coord_enable;
+}
+
+void r300_init_render_functions(struct r300_context *r300)
+{
+    /* Set draw functions based on presence of HW TCL. */
+    if (r300->screen->caps.has_tcl) {
+        r300->context.draw_vbo = r300_draw_vbo;
+    } else {
+        r300->context.draw_vbo = r300_swtcl_draw_vbo;
+    }
+
+    /* Plug in the two-sided stencil reference value fallback if needed. */
+    if (!r300->screen->caps.is_r500)
+        r300_plug_in_stencil_ref_fallback(r300);
+}