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  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 "main/macros.h"
  30. #include "brw_context.h"
  31. #include "intel_batchbuffer.h"
  32. #include "brw_defines.h"
  33. #include "brw_state.h"
  34. #include "main/transformfeedback.h"
  35.  
  36. static void
  37. gen6_update_sol_surfaces(struct brw_context *brw)
  38. {
  39.    struct gl_context *ctx = &brw->ctx;
  40.    /* BRW_NEW_TRANSFORM_FEEDBACK */
  41.    struct gl_transform_feedback_object *xfb_obj =
  42.       ctx->TransformFeedback.CurrentObject;
  43.    /* BRW_NEW_VERTEX_PROGRAM */
  44.    const struct gl_shader_program *shaderprog =
  45.       ctx->Shader.CurrentVertexProgram;
  46.    const struct gl_transform_feedback_info *linked_xfb_info =
  47.       &shaderprog->LinkedTransformFeedback;
  48.    int i;
  49.  
  50.    for (i = 0; i < BRW_MAX_SOL_BINDINGS; ++i) {
  51.       const int surf_index = SURF_INDEX_SOL_BINDING(i);
  52.       if (_mesa_is_xfb_active_and_unpaused(ctx) &&
  53.           i < linked_xfb_info->NumOutputs) {
  54.          unsigned buffer = linked_xfb_info->Outputs[i].OutputBuffer;
  55.          unsigned buffer_offset =
  56.             xfb_obj->Offset[buffer] / 4 +
  57.             linked_xfb_info->Outputs[i].DstOffset;
  58.          brw_update_sol_surface(
  59.             brw, xfb_obj->Buffers[buffer], &brw->gs.surf_offset[surf_index],
  60.             linked_xfb_info->Outputs[i].NumComponents,
  61.             linked_xfb_info->BufferStride[buffer], buffer_offset);
  62.       } else {
  63.          brw->gs.surf_offset[surf_index] = 0;
  64.       }
  65.    }
  66.  
  67.    brw->state.dirty.brw |= BRW_NEW_SURFACES;
  68. }
  69.  
  70. const struct brw_tracked_state gen6_sol_surface = {
  71.    .dirty = {
  72.       .mesa = 0,
  73.       .brw = (BRW_NEW_BATCH |
  74.               BRW_NEW_VERTEX_PROGRAM |
  75.               BRW_NEW_TRANSFORM_FEEDBACK),
  76.       .cache = 0
  77.    },
  78.    .emit = gen6_update_sol_surfaces,
  79. };
  80.  
  81. /**
  82.  * Constructs the binding table for the WM surface state, which maps unit
  83.  * numbers to surface state objects.
  84.  */
  85. static void
  86. brw_gs_upload_binding_table(struct brw_context *brw)
  87. {
  88.    struct gl_context *ctx = &brw->ctx;
  89.    /* BRW_NEW_VERTEX_PROGRAM */
  90.    const struct gl_shader_program *shaderprog =
  91.       ctx->Shader.CurrentVertexProgram;
  92.    bool has_surfaces = false;
  93.    uint32_t *bind;
  94.  
  95.    if (shaderprog) {
  96.       const struct gl_transform_feedback_info *linked_xfb_info =
  97.          &shaderprog->LinkedTransformFeedback;
  98.       /* Currently we only ever upload surfaces for SOL. */
  99.       has_surfaces = linked_xfb_info->NumOutputs != 0;
  100.    }
  101.  
  102.    /* Skip making a binding table if we don't have anything to put in it. */
  103.    if (!has_surfaces) {
  104.       if (brw->gs.bind_bo_offset != 0) {
  105.          brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;
  106.          brw->gs.bind_bo_offset = 0;
  107.       }
  108.       return;
  109.    }
  110.  
  111.    /* Might want to calculate nr_surfaces first, to avoid taking up so much
  112.     * space for the binding table.
  113.     */
  114.    bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,
  115.                           sizeof(uint32_t) * BRW_MAX_GS_SURFACES,
  116.                           32, &brw->gs.bind_bo_offset);
  117.  
  118.    /* BRW_NEW_SURFACES */
  119.    memcpy(bind, brw->gs.surf_offset, BRW_MAX_GS_SURFACES * sizeof(uint32_t));
  120.  
  121.    brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;
  122. }
  123.  
  124. const struct brw_tracked_state gen6_gs_binding_table = {
  125.    .dirty = {
  126.       .mesa = 0,
  127.       .brw = (BRW_NEW_BATCH |
  128.               BRW_NEW_VERTEX_PROGRAM |
  129.               BRW_NEW_SURFACES),
  130.       .cache = 0
  131.    },
  132.    .emit = brw_gs_upload_binding_table,
  133. };
  134.  
  135. void
  136. brw_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
  137.                              struct gl_transform_feedback_object *obj)
  138. {
  139.    struct brw_context *brw = brw_context(ctx);
  140.    const struct gl_shader_program *vs_prog =
  141.       ctx->Shader.CurrentVertexProgram;
  142.    const struct gl_transform_feedback_info *linked_xfb_info =
  143.       &vs_prog->LinkedTransformFeedback;
  144.    struct gl_transform_feedback_object *xfb_obj =
  145.       ctx->TransformFeedback.CurrentObject;
  146.  
  147.    assert(brw->gen == 6);
  148.  
  149.    /* Compute the maximum number of vertices that we can write without
  150.     * overflowing any of the buffers currently being used for feedback.
  151.     */
  152.    unsigned max_index
  153.       = _mesa_compute_max_transform_feedback_vertices(xfb_obj,
  154.                                                       linked_xfb_info);
  155.  
  156.    /* 3DSTATE_GS_SVB_INDEX is non-pipelined. */
  157.    intel_emit_post_sync_nonzero_flush(brw);
  158.  
  159.    /* Initialize the SVBI 0 register to zero and set the maximum index. */
  160.    BEGIN_BATCH(4);
  161.    OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));
  162.    OUT_BATCH(0); /* SVBI 0 */
  163.    OUT_BATCH(0); /* starting index */
  164.    OUT_BATCH(max_index);
  165.    ADVANCE_BATCH();
  166.  
  167.    /* Initialize the rest of the unused streams to sane values.  Otherwise,
  168.     * they may indicate that there is no room to write data and prevent
  169.     * anything from happening at all.
  170.     */
  171.    for (int i = 1; i < 4; i++) {
  172.       BEGIN_BATCH(4);
  173.       OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));
  174.       OUT_BATCH(i << SVB_INDEX_SHIFT);
  175.       OUT_BATCH(0); /* starting index */
  176.       OUT_BATCH(0xffffffff);
  177.       ADVANCE_BATCH();
  178.    }
  179. }
  180.  
  181. void
  182. brw_end_transform_feedback(struct gl_context *ctx,
  183.                            struct gl_transform_feedback_object *obj)
  184. {
  185.    /* After EndTransformFeedback, it's likely that the client program will try
  186.     * to draw using the contents of the transform feedback buffer as vertex
  187.     * input.  In order for this to work, we need to flush the data through at
  188.     * least the GS stage of the pipeline, and flush out the render cache.  For
  189.     * simplicity, just do a full flush.
  190.     */
  191.    struct brw_context *brw = brw_context(ctx);
  192.    intel_batchbuffer_emit_mi_flush(brw);
  193. }
  194.