src/mesa/drivers/dri/i965/gen6_sol.c

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /** \file gen6_sol.c
  25  *
  26  * Code to initialize the binding table entries used by transform feedback.
  27  */
  28
  29 #include "brw_context.h"
  30 #include "intel_batchbuffer.h"
  31 #include "brw_defines.h"
  32
  33 static void
  34 gen6_update_sol_surfaces(struct brw_context *brw)
  35 {
  36    struct gl_context *ctx = &brw->intel.ctx;
  37    /* _NEW_TRANSFORM_FEEDBACK */
  38    struct gl_transform_feedback_object *xfb_obj =
  39       ctx->TransformFeedback.CurrentObject;
  40    /* BRW_NEW_VERTEX_PROGRAM */
  41    const struct gl_shader_program *shaderprog =
  42       ctx->Shader.CurrentVertexProgram;
  43    const struct gl_transform_feedback_info *linked_xfb_info =
  44       &shaderprog->LinkedTransformFeedback;
  45    int i;
  46
  47    for (i = 0; i < BRW_MAX_SOL_BINDINGS; ++i) {
  48       const int surf_index = SURF_INDEX_SOL_BINDING(i);
  49       if (xfb_obj->Active && i < linked_xfb_info->NumOutputs) {
  50          unsigned buffer = linked_xfb_info->Outputs[i].OutputBuffer;
  51          unsigned buffer_offset =
  52             xfb_obj->Offset[buffer] / 4 +
  53             linked_xfb_info->Outputs[i].DstOffset;
  54          brw_update_sol_surface(
  55             brw, xfb_obj->Buffers[buffer], &brw->bind.surf_offset[surf_index],
  56             linked_xfb_info->Outputs[i].NumComponents,
  57             linked_xfb_info->BufferStride[buffer], buffer_offset);
  58       } else {
  59          brw->bind.surf_offset[surf_index] = 0;
  60       }
  61    }
  62 }
  63
  64 const struct brw_tracked_state gen6_sol_surface = {
  65    .dirty = {
  66       .mesa = _NEW_TRANSFORM_FEEDBACK,
  67       .brw = (BRW_NEW_BATCH |
  68               BRW_NEW_VERTEX_PROGRAM),
  69       .cache = 0
  70    },
  71    .emit = gen6_update_sol_surfaces,
  72 };
  73
  74 void
  75 brw_end_transform_feedback(struct gl_context *ctx,
  76                            struct gl_transform_feedback_object *obj)
  77 {
  78    /* After EndTransformFeedback, it's likely that the client program will try
  79     * to draw using the contents of the transform feedback buffer as vertex
  80     * input.  In order for this to work, we need to flush the data through at
  81     * least the GS stage of the pipeline, and flush out the render cache.  For
  82     * simplicity, just do a full flush.
  83     */
  84    struct brw_context *brw = brw_context(ctx);
  85    struct intel_context *intel = &brw->intel;
  86    intel_batchbuffer_emit_mi_flush(intel);
  87 }