path: root/src/gallium/drivers/svga/svga_draw.c

/**********************************************************
 * Copyright 2008-2009 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, 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 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 "pipe/p_compiler.h"
#include "util/u_inlines.h"
#include "pipe/p_defines.h"
#include "util/u_helpers.h"
#include "util/u_memory.h"
#include "util/u_math.h"

#include "svga_context.h"
#include "svga_draw.h"
#include "svga_draw_private.h"
#include "svga_debug.h"
#include "svga_screen.h"
#include "svga_resource.h"
#include "svga_resource_buffer.h"
#include "svga_resource_texture.h"
#include "svga_shader.h"
#include "svga_surface.h"
#include "svga_winsys.h"
#include "svga_cmd.h"


struct svga_hwtnl *
svga_hwtnl_create(struct svga_context *svga)
{
   struct svga_hwtnl *hwtnl = CALLOC_STRUCT(svga_hwtnl);
   if (!hwtnl)
      goto fail;

   hwtnl->svga = svga;

   hwtnl->cmd.swc = svga->swc;

   return hwtnl;

fail:
   return NULL;
}


void
svga_hwtnl_destroy(struct svga_hwtnl *hwtnl)
{
   unsigned i, j;

   for (i = 0; i < PIPE_PRIM_MAX; i++) {
      for (j = 0; j < IDX_CACHE_MAX; j++) {
         pipe_resource_reference(&hwtnl->index_cache[i][j].buffer, NULL);
      }
   }

   for (i = 0; i < hwtnl->cmd.vbuf_count; i++)
      pipe_resource_reference(&hwtnl->cmd.vbufs[i].buffer, NULL);

   for (i = 0; i < hwtnl->cmd.prim_count; i++)
      pipe_resource_reference(&hwtnl->cmd.prim_ib[i], NULL);

   FREE(hwtnl);
}


void
svga_hwtnl_set_flatshade(struct svga_hwtnl *hwtnl,
                         boolean flatshade, boolean flatshade_first)
{
   struct svga_screen *svgascreen = svga_screen(hwtnl->svga->pipe.screen);

   /* User-specified PV */
   hwtnl->api_pv = (flatshade && !flatshade_first) ? PV_LAST : PV_FIRST;

   /* Device supported PV */
   if (svgascreen->haveProvokingVertex) {
      /* use the mode specified by the user */
      hwtnl->hw_pv = hwtnl->api_pv;
   }
   else {
      /* the device only support first provoking vertex */
      hwtnl->hw_pv = PV_FIRST;
   }
}


void
svga_hwtnl_set_fillmode(struct svga_hwtnl *hwtnl, unsigned mode)
{
   hwtnl->api_fillmode = mode;
}


void
svga_hwtnl_vertex_decls(struct svga_hwtnl *hwtnl,
                        unsigned count,
                        const SVGA3dVertexDecl * decls,
                        const unsigned *buffer_indexes,
                        SVGA3dElementLayoutId layout_id)
{
   assert(hwtnl->cmd.prim_count == 0);
   hwtnl->cmd.vdecl_count = count;
   hwtnl->cmd.vdecl_layout_id = layout_id;
   memcpy(hwtnl->cmd.vdecl, decls, count * sizeof(*decls));
   memcpy(hwtnl->cmd.vdecl_buffer_index, buffer_indexes,
          count * sizeof(unsigned));
}


/**
 * Specify vertex buffers for hardware drawing.
 */
void
svga_hwtnl_vertex_buffers(struct svga_hwtnl *hwtnl,
                          unsigned count, struct pipe_vertex_buffer *buffers)
{
   util_set_vertex_buffers_count(hwtnl->cmd.vbufs,
                                 &hwtnl->cmd.vbuf_count, buffers, 0, count);
}


/**
 * Determine whether the specified buffer is referred in the primitive queue,
 * for which no commands have been written yet.
 */
boolean
svga_hwtnl_is_buffer_referred(struct svga_hwtnl *hwtnl,
                              struct pipe_resource *buffer)
{
   unsigned i;

   if (svga_buffer_is_user_buffer(buffer)) {
      return FALSE;
   }

   if (!hwtnl->cmd.prim_count) {
      return FALSE;
   }

   for (i = 0; i < hwtnl->cmd.vbuf_count; ++i) {
      if (hwtnl->cmd.vbufs[i].buffer == buffer) {
         return TRUE;
      }
   }

   for (i = 0; i < hwtnl->cmd.prim_count; ++i) {
      if (hwtnl->cmd.prim_ib[i] == buffer) {
         return TRUE;
      }
   }

   return FALSE;
}


static enum pipe_error
draw_vgpu9(struct svga_hwtnl *hwtnl)
{
   struct svga_winsys_context *swc = hwtnl->cmd.swc;
   struct svga_context *svga = hwtnl->svga;
   enum pipe_error ret;
   struct svga_winsys_surface *vb_handle[SVGA3D_INPUTREG_MAX];
   struct svga_winsys_surface *ib_handle[QSZ];
   struct svga_winsys_surface *handle;
   SVGA3dVertexDecl *vdecl;
   SVGA3dPrimitiveRange *prim;
   unsigned i;

   for (i = 0; i < hwtnl->cmd.vdecl_count; i++) {
      unsigned j = hwtnl->cmd.vdecl_buffer_index[i];
      handle = svga_buffer_handle(svga, hwtnl->cmd.vbufs[j].buffer);
      if (!handle)
         return PIPE_ERROR_OUT_OF_MEMORY;

      vb_handle[i] = handle;
   }

   for (i = 0; i < hwtnl->cmd.prim_count; i++) {
      if (hwtnl->cmd.prim_ib[i]) {
         handle = svga_buffer_handle(svga, hwtnl->cmd.prim_ib[i]);
         if (!handle)
            return PIPE_ERROR_OUT_OF_MEMORY;
      }
      else
         handle = NULL;

      ib_handle[i] = handle;
   }

   if (svga->rebind.flags.rendertargets) {
      ret = svga_reemit_framebuffer_bindings(svga);
      if (ret != PIPE_OK) {
         return ret;
      }
   }

   if (svga->rebind.flags.texture_samplers) {
      ret = svga_reemit_tss_bindings(svga);
      if (ret != PIPE_OK) {
         return ret;
      }
   }

   if (svga->rebind.flags.vs) {
      ret = svga_reemit_vs_bindings(svga);
      if (ret != PIPE_OK) {
         return ret;
      }
   }

   if (svga->rebind.flags.fs) {
      ret = svga_reemit_fs_bindings(svga);
      if (ret != PIPE_OK) {
         return ret;
      }
   }

   SVGA_DBG(DEBUG_DMA, "draw to sid %p, %d prims\n",
            svga->curr.framebuffer.cbufs[0] ?
            svga_surface(svga->curr.framebuffer.cbufs[0])->handle : NULL,
            hwtnl->cmd.prim_count);

   ret = SVGA3D_BeginDrawPrimitives(swc,
                                    &vdecl,
                                    hwtnl->cmd.vdecl_count,
                                    &prim, hwtnl->cmd.prim_count);
   if (ret != PIPE_OK)
      return ret;

   memcpy(vdecl,
          hwtnl->cmd.vdecl,
          hwtnl->cmd.vdecl_count * sizeof hwtnl->cmd.vdecl[0]);

   for (i = 0; i < hwtnl->cmd.vdecl_count; i++) {
      /* check for 4-byte alignment */
      assert(vdecl[i].array.offset % 4 == 0);
      assert(vdecl[i].array.stride % 4 == 0);

      /* Given rangeHint is considered to be relative to indexBias, and
       * indexBias varies per primitive, we cannot accurately supply an
       * rangeHint when emitting more than one primitive per draw command.
       */
      if (hwtnl->cmd.prim_count == 1) {
         vdecl[i].rangeHint.first = hwtnl->cmd.min_index[0];
         vdecl[i].rangeHint.last = hwtnl->cmd.max_index[0] + 1;
      }
      else {
         vdecl[i].rangeHint.first = 0;
         vdecl[i].rangeHint.last = 0;
      }

      swc->surface_relocation(swc,
                              &vdecl[i].array.surfaceId,
                              NULL, vb_handle[i], SVGA_RELOC_READ);
   }

   memcpy(prim,
          hwtnl->cmd.prim, hwtnl->cmd.prim_count * sizeof hwtnl->cmd.prim[0]);

   for (i = 0; i < hwtnl->cmd.prim_count; i++) {
      swc->surface_relocation(swc,
                              &prim[i].indexArray.surfaceId,
                              NULL, ib_handle[i], SVGA_RELOC_READ);
      pipe_resource_reference(&hwtnl->cmd.prim_ib[i], NULL);
   }

   SVGA_FIFOCommitAll(swc);

   hwtnl->cmd.prim_count = 0;

   return PIPE_OK;
}


static SVGA3dSurfaceFormat
xlate_index_format(unsigned indexWidth)
{
   if (indexWidth == 2) {
      return SVGA3D_R16_UINT;
   }
   else if (indexWidth == 4) {
      return SVGA3D_R32_UINT;
   }
   else {
      assert(!"Bad indexWidth");
      return SVGA3D_R32_UINT;
   }
}


static enum pipe_error
validate_sampler_resources(struct svga_context *svga)
{
   unsigned shader;

   assert(svga_have_vgpu10(svga));

   for (shader = PIPE_SHADER_VERTEX; shader <= PIPE_SHADER_GEOMETRY; shader++) {
      unsigned count = svga->curr.num_sampler_views[shader];
      unsigned i;
      struct svga_winsys_surface *surfaces[PIPE_MAX_SAMPLERS];
      enum pipe_error ret;

      /*
       * Reference bound sampler resources to ensure pending updates are
       * noticed by the device.
       */
      for (i = 0; i < count; i++) {
         struct svga_pipe_sampler_view *sv =
            svga_pipe_sampler_view(svga->curr.sampler_views[shader][i]);

         if (sv) {
            if (sv->base.texture->target == PIPE_BUFFER) {
               surfaces[i] = svga_buffer_handle(svga, sv->base.texture);
            }
            else {
               surfaces[i] = svga_texture(sv->base.texture)->handle;
            }
         }
         else {
            surfaces[i] = NULL;
         }
      }

      if (shader == PIPE_SHADER_FRAGMENT &&
          svga->curr.rast->templ.poly_stipple_enable) {
         const unsigned unit = svga->state.hw_draw.fs->pstipple_sampler_unit;
         struct svga_pipe_sampler_view *sv =
            svga->polygon_stipple.sampler_view;

         assert(sv);
         surfaces[unit] = svga_texture(sv->base.texture)->handle;
         count = MAX2(count, unit+1);
      }

      /* rebind the shader resources if needed */
      if (svga->rebind.flags.texture_samplers) {
         for (i = 0; i < count; i++) {
            if (surfaces[i]) {
               ret = svga->swc->resource_rebind(svga->swc,
                                                surfaces[i],
                                                NULL,
                                                SVGA_RELOC_READ);
               if (ret != PIPE_OK)
                  return ret;
            }
         }
      }
   }
   svga->rebind.flags.texture_samplers = FALSE;

   return PIPE_OK;
}


static enum pipe_error
validate_constant_buffers(struct svga_context *svga)
{
   unsigned shader;

   assert(svga_have_vgpu10(svga));

   for (shader = PIPE_SHADER_VERTEX; shader <= PIPE_SHADER_GEOMETRY; shader++) {
      enum pipe_error ret;
      struct svga_buffer *buffer;
      struct svga_winsys_surface *handle;
      unsigned enabled_constbufs;

      /* Rebind the default constant buffer if needed */
      if (svga->rebind.flags.constbufs) {
         buffer = svga_buffer(svga->state.hw_draw.constbuf[shader]);
         if (buffer) {
            ret = svga->swc->resource_rebind(svga->swc,
                                             buffer->handle,
                                             NULL,
                                             SVGA_RELOC_READ);
            if (ret != PIPE_OK)
               return ret;
         }
      }

      /*
       * Reference other bound constant buffers to ensure pending updates are
       * noticed by the device.
       */
      enabled_constbufs = svga->state.hw_draw.enabled_constbufs[shader] & ~1u;
      while (enabled_constbufs) {
         unsigned i = u_bit_scan(&enabled_constbufs);
         buffer = svga_buffer(svga->curr.constbufs[shader][i].buffer);
         if (buffer) {
            handle = svga_buffer_handle(svga, &buffer->b.b);

            if (svga->rebind.flags.constbufs) {
               ret = svga->swc->resource_rebind(svga->swc,
                                                handle,
                                                NULL,
                                                SVGA_RELOC_READ);
               if (ret != PIPE_OK)
                  return ret;
            }
         }
      }
   }
   svga->rebind.flags.constbufs = FALSE;

   return PIPE_OK;
}


static enum pipe_error
draw_vgpu10(struct svga_hwtnl *hwtnl,
            const SVGA3dPrimitiveRange *range,
            unsigned vcount,
            unsigned min_index,
            unsigned max_index, struct pipe_resource *ib,
            unsigned start_instance, unsigned instance_count)
{
   struct svga_context *svga = hwtnl->svga;
   struct svga_winsys_surface *vb_handle[SVGA3D_INPUTREG_MAX];
   struct svga_winsys_surface *ib_handle;
   const unsigned vbuf_count = hwtnl->cmd.vbuf_count;
   enum pipe_error ret;
   unsigned i;

   assert(svga_have_vgpu10(svga));
   assert(hwtnl->cmd.prim_count == 0);

   /* We need to reemit all the current resource bindings along with the Draw
    * command to be sure that the referenced resources are available for the
    * Draw command, just in case the surfaces associated with the resources
    * are paged out.
    */
   if (svga->rebind.val) {
      ret = svga_rebind_framebuffer_bindings(svga);
      if (ret != PIPE_OK)
         return ret;

      ret = svga_rebind_shaders(svga);
      if (ret != PIPE_OK)
         return ret;

      /* Rebind stream output targets */
      ret = svga_rebind_stream_output_targets(svga);
      if (ret != PIPE_OK)
         return ret;

      /* Force rebinding the index buffer when needed */
      svga->state.hw_draw.ib = NULL;
   }

   ret = validate_sampler_resources(svga);
   if (ret != PIPE_OK)
      return ret;

   ret = validate_constant_buffers(svga);
   if (ret != PIPE_OK)
      return ret;

   /* Get handle for each referenced vertex buffer */
   for (i = 0; i < vbuf_count; i++) {
      struct svga_buffer *sbuf = svga_buffer(hwtnl->cmd.vbufs[i].buffer);

      if (sbuf) {
         assert(sbuf->key.flags & SVGA3D_SURFACE_BIND_VERTEX_BUFFER);
         vb_handle[i] = svga_buffer_handle(svga, &sbuf->b.b);
         if (vb_handle[i] == NULL)
            return PIPE_ERROR_OUT_OF_MEMORY;
      }
      else {
         vb_handle[i] = NULL;
      }
   }

   /* Get handles for the index buffers */
   if (ib) {
      struct svga_buffer *sbuf = svga_buffer(ib);

      assert(sbuf->key.flags & SVGA3D_SURFACE_BIND_INDEX_BUFFER);
      (void) sbuf; /* silence unused var warning */

      ib_handle = svga_buffer_handle(svga, ib);
      if (!ib_handle)
         return PIPE_ERROR_OUT_OF_MEMORY;
   }
   else {
      ib_handle = NULL;
   }

   /* setup vertex attribute input layout */
   if (svga->state.hw_draw.layout_id != hwtnl->cmd.vdecl_layout_id) {
      ret = SVGA3D_vgpu10_SetInputLayout(svga->swc,
                                         hwtnl->cmd.vdecl_layout_id);
      if (ret != PIPE_OK)
         return ret;

      svga->state.hw_draw.layout_id = hwtnl->cmd.vdecl_layout_id;
   }

   /* setup vertex buffers */
   {
      SVGA3dVertexBuffer buffers[PIPE_MAX_ATTRIBS];

      for (i = 0; i < vbuf_count; i++) {
         buffers[i].stride = hwtnl->cmd.vbufs[i].stride;
         buffers[i].offset = hwtnl->cmd.vbufs[i].buffer_offset;
      }
      if (vbuf_count > 0) {
         /* If we haven't yet emitted a drawing command or if any
          * vertex buffer state is changing, issue that state now.
          */
         if (((hwtnl->cmd.swc->hints & SVGA_HINT_FLAG_CAN_PRE_FLUSH) == 0) ||
             vbuf_count != svga->state.hw_draw.num_vbuffers ||
             memcmp(buffers, svga->state.hw_draw.vbuffers,
                    vbuf_count * sizeof(buffers[0])) ||
             memcmp(vb_handle, svga->state.hw_draw.vbuffer_handles,
                    vbuf_count * sizeof(vb_handle[0]))) {
            ret = SVGA3D_vgpu10_SetVertexBuffers(svga->swc, vbuf_count,
                                                 0,    /* startBuffer */
                                                 buffers, vb_handle);
            if (ret != PIPE_OK)
               return ret;

            svga->state.hw_draw.num_vbuffers = vbuf_count;
            memcpy(svga->state.hw_draw.vbuffers, buffers,
                   vbuf_count * sizeof(buffers[0]));
            memcpy(svga->state.hw_draw.vbuffer_handles, vb_handle,
                   vbuf_count * sizeof(vb_handle[0]));
         }
      }
   }

   /* Set primitive type (line, tri, etc) */
   if (svga->state.hw_draw.topology != range->primType) {
      ret = SVGA3D_vgpu10_SetTopology(svga->swc, range->primType);
      if (ret != PIPE_OK)
         return ret;

      svga->state.hw_draw.topology = range->primType;
   }

   if (ib_handle) {
      /* indexed drawing */
      SVGA3dSurfaceFormat indexFormat = xlate_index_format(range->indexWidth);

      /* setup index buffer */
      if (ib_handle != svga->state.hw_draw.ib ||
          indexFormat != svga->state.hw_draw.ib_format ||
          range->indexArray.offset != svga->state.hw_draw.ib_offset) {
         ret = SVGA3D_vgpu10_SetIndexBuffer(svga->swc, ib_handle,
                                            indexFormat,
                                            range->indexArray.offset);
         if (ret != PIPE_OK)
            return ret;
         svga->state.hw_draw.ib = ib_handle;
         svga->state.hw_draw.ib_format = indexFormat;
         svga->state.hw_draw.ib_offset = range->indexArray.offset;
      }

      if (instance_count > 1) {
         ret = SVGA3D_vgpu10_DrawIndexedInstanced(svga->swc,
                                                  vcount,
                                                  instance_count,
                                                  0, /* startIndexLocation */
                                                  range->indexBias,
                                                  start_instance);
         if (ret != PIPE_OK)
            return ret;
      }
      else {
         /* non-instanced drawing */
         ret = SVGA3D_vgpu10_DrawIndexed(svga->swc,
                                         vcount,
                                         0,      /* startIndexLocation */
                                         range->indexBias);
         if (ret != PIPE_OK)
            return ret;
      }
   }
   else {
      /* non-indexed drawing */
      if (svga->state.hw_draw.ib_format != SVGA3D_FORMAT_INVALID) {
         /* Unbind previously bound index buffer */
         ret = SVGA3D_vgpu10_SetIndexBuffer(svga->swc, NULL,
                                            SVGA3D_FORMAT_INVALID, 0);
         if (ret != PIPE_OK)
            return ret;
         svga->state.hw_draw.ib_format = SVGA3D_FORMAT_INVALID;
         svga->state.hw_draw.ib = NULL;
      }

      if (instance_count > 1) {
         ret = SVGA3D_vgpu10_DrawInstanced(svga->swc,
                                           vcount,
                                           instance_count,
                                           range->indexBias,
                                           start_instance);
         if (ret != PIPE_OK)
            return ret;
      }
      else {
         /* non-instanced */
         ret = SVGA3D_vgpu10_Draw(svga->swc,
                                  vcount,
                                  range->indexBias);
         if (ret != PIPE_OK)
            return ret;
      }
   }

   hwtnl->cmd.prim_count = 0;

   return PIPE_OK;
}



/**
 * Emit any pending drawing commands to the command buffer.
 * When we receive VGPU9 drawing commands we accumulate them and don't
 * immediately emit them into the command buffer.
 * This function needs to be called before we change state that could
 * effect those pending draws.
 */
enum pipe_error
svga_hwtnl_flush(struct svga_hwtnl *hwtnl)
{
   if (!svga_have_vgpu10(hwtnl->svga) && hwtnl->cmd.prim_count) {
      /* we only queue up primitive for VGPU9 */
      return draw_vgpu9(hwtnl);
   }
   return PIPE_OK;
}


void
svga_hwtnl_set_index_bias(struct svga_hwtnl *hwtnl, int index_bias)
{
   hwtnl->index_bias = index_bias;
}



/***********************************************************************
 * Internal functions:
 */

/**
 * For debugging only.
 */
static void
check_draw_params(struct svga_hwtnl *hwtnl,
                  const SVGA3dPrimitiveRange *range,
                  unsigned min_index, unsigned max_index,
                  struct pipe_resource *ib)
{
   unsigned i;

   assert(!svga_have_vgpu10(hwtnl->svga));

   for (i = 0; i < hwtnl->cmd.vdecl_count; i++) {
      unsigned j = hwtnl->cmd.vdecl_buffer_index[i];
      const struct pipe_vertex_buffer *vb = &hwtnl->cmd.vbufs[j];
      unsigned size = vb->buffer ? vb->buffer->width0 : 0;
      unsigned offset = hwtnl->cmd.vdecl[i].array.offset;
      unsigned stride = hwtnl->cmd.vdecl[i].array.stride;
      int index_bias = (int) range->indexBias + hwtnl->index_bias;
      unsigned width;

      if (size == 0)
         continue;

      assert(vb);
      assert(size);
      assert(offset < size);
      assert(min_index <= max_index);
      (void) width;
      (void) stride;
      (void) offset;
      (void) size;

      switch (hwtnl->cmd.vdecl[i].identity.type) {
      case SVGA3D_DECLTYPE_FLOAT1:
         width = 4;
         break;
      case SVGA3D_DECLTYPE_FLOAT2:
         width = 4 * 2;
         break;
      case SVGA3D_DECLTYPE_FLOAT3:
         width = 4 * 3;
         break;
      case SVGA3D_DECLTYPE_FLOAT4:
         width = 4 * 4;
         break;
      case SVGA3D_DECLTYPE_D3DCOLOR:
         width = 4;
         break;
      case SVGA3D_DECLTYPE_UBYTE4:
         width = 1 * 4;
         break;
      case SVGA3D_DECLTYPE_SHORT2:
         width = 2 * 2;
         break;
      case SVGA3D_DECLTYPE_SHORT4:
         width = 2 * 4;
         break;
      case SVGA3D_DECLTYPE_UBYTE4N:
         width = 1 * 4;
         break;
      case SVGA3D_DECLTYPE_SHORT2N:
         width = 2 * 2;
         break;
      case SVGA3D_DECLTYPE_SHORT4N:
         width = 2 * 4;
         break;
      case SVGA3D_DECLTYPE_USHORT2N:
         width = 2 * 2;
         break;
      case SVGA3D_DECLTYPE_USHORT4N:
         width = 2 * 4;
         break;
      case SVGA3D_DECLTYPE_UDEC3:
         width = 4;
         break;
      case SVGA3D_DECLTYPE_DEC3N:
         width = 4;
         break;
      case SVGA3D_DECLTYPE_FLOAT16_2:
         width = 2 * 2;
         break;
      case SVGA3D_DECLTYPE_FLOAT16_4:
         width = 2 * 4;
         break;
      default:
         assert(0);
         width = 0;
         break;
      }

      if (index_bias >= 0) {
         assert(offset + index_bias * stride + width <= size);
      }

      /*
       * min_index/max_index are merely conservative guesses, so we can't
       * make buffer overflow detection based on their values.
       */
   }

   assert(range->indexWidth == range->indexArray.stride);

   if (ib) {
      unsigned size = ib->width0;
      unsigned offset = range->indexArray.offset;
      unsigned stride = range->indexArray.stride;
      unsigned count;

      assert(size);
      assert(offset < size);
      assert(stride);
      (void) size;
      (void) offset;
      (void) stride;

      switch (range->primType) {
      case SVGA3D_PRIMITIVE_POINTLIST:
         count = range->primitiveCount;
         break;
      case SVGA3D_PRIMITIVE_LINELIST:
         count = range->primitiveCount * 2;
         break;
      case SVGA3D_PRIMITIVE_LINESTRIP:
         count = range->primitiveCount + 1;
         break;
      case SVGA3D_PRIMITIVE_TRIANGLELIST:
         count = range->primitiveCount * 3;
         break;
      case SVGA3D_PRIMITIVE_TRIANGLESTRIP:
         count = range->primitiveCount + 2;
         break;
      case SVGA3D_PRIMITIVE_TRIANGLEFAN:
         count = range->primitiveCount + 2;
         break;
      default:
         assert(0);
         count = 0;
         break;
      }

      assert(offset + count * stride <= size);
   }
}


/**
 * All drawing filters down into this function, either directly
 * on the hardware path or after doing software vertex processing.
 */
enum pipe_error
svga_hwtnl_prim(struct svga_hwtnl *hwtnl,
                const SVGA3dPrimitiveRange * range,
                unsigned vcount,
                unsigned min_index,
                unsigned max_index, struct pipe_resource *ib,
                unsigned start_instance, unsigned instance_count)
{
   enum pipe_error ret = PIPE_OK;

   if (svga_have_vgpu10(hwtnl->svga)) {
      /* draw immediately */
      ret = draw_vgpu10(hwtnl, range, vcount, min_index, max_index, ib,
                        start_instance, instance_count);
      if (ret != PIPE_OK) {
         svga_context_flush(hwtnl->svga, NULL);
         ret = draw_vgpu10(hwtnl, range, vcount, min_index, max_index, ib,
                           start_instance, instance_count);
         assert(ret == PIPE_OK);
      }
   }
   else {
      /* batch up drawing commands */
#ifdef DEBUG
      check_draw_params(hwtnl, range, min_index, max_index, ib);
      assert(start_instance == 0);
      assert(instance_count <= 1);
#else
      (void) check_draw_params;
#endif

      if (hwtnl->cmd.prim_count + 1 >= QSZ) {
         ret = svga_hwtnl_flush(hwtnl);
         if (ret != PIPE_OK)
            return ret;
      }

      /* min/max indices are relative to bias */
      hwtnl->cmd.min_index[hwtnl->cmd.prim_count] = min_index;
      hwtnl->cmd.max_index[hwtnl->cmd.prim_count] = max_index;

      hwtnl->cmd.prim[hwtnl->cmd.prim_count] = *range;
      hwtnl->cmd.prim[hwtnl->cmd.prim_count].indexBias += hwtnl->index_bias;

      pipe_resource_reference(&hwtnl->cmd.prim_ib[hwtnl->cmd.prim_count], ib);
      hwtnl->cmd.prim_count++;
   }

   return ret;
}