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  1. /*
  2.  * Copyright © 2009 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.  * Authors:
  24.  *    Eric Anholt <eric@anholt.net>
  25.  *
  26.  */
  27.  
  28. #include "brw_context.h"
  29. #include "brw_state.h"
  30. #include "brw_defines.h"
  31. #include "intel_batchbuffer.h"
  32.  
  33. static void
  34. gen6_upload_gs_push_constants(struct brw_context *brw)
  35. {
  36.    struct brw_stage_state *stage_state = &brw->gs.base;
  37.  
  38.    /* BRW_NEW_GEOMETRY_PROGRAM */
  39.    const struct brw_geometry_program *gp =
  40.       (struct brw_geometry_program *) brw->geometry_program;
  41.  
  42.    if (gp) {
  43.       /* BRW_NEW_GS_PROG_DATA */
  44.       struct brw_stage_prog_data *prog_data = &brw->gs.prog_data->base.base;
  45.  
  46.       gen6_upload_push_constants(brw, &gp->program.Base, prog_data,
  47.                                  stage_state, AUB_TRACE_VS_CONSTANTS);
  48.    }
  49.  
  50.    if (brw->gen >= 7)
  51.       gen7_upload_constant_state(brw, stage_state, gp, _3DSTATE_CONSTANT_GS);
  52. }
  53.  
  54. const struct brw_tracked_state gen6_gs_push_constants = {
  55.    .dirty = {
  56.       .mesa  = _NEW_PROGRAM_CONSTANTS |
  57.                _NEW_TRANSFORM,
  58.       .brw   = BRW_NEW_BATCH |
  59.                BRW_NEW_GEOMETRY_PROGRAM |
  60.                BRW_NEW_GS_PROG_DATA |
  61.                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
  62.    },
  63.    .emit = gen6_upload_gs_push_constants,
  64. };
  65.  
  66. static void
  67. upload_gs_state_for_tf(struct brw_context *brw)
  68. {
  69.    BEGIN_BATCH(7);
  70.    OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  71.    OUT_BATCH(brw->ff_gs.prog_offset);
  72.    OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE);
  73.    OUT_BATCH(0); /* no scratch space */
  74.    OUT_BATCH((2 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
  75.              (brw->ff_gs.prog_data->urb_read_length << GEN6_GS_URB_READ_LENGTH_SHIFT));
  76.    OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
  77.              GEN6_GS_STATISTICS_ENABLE |
  78.              GEN6_GS_SO_STATISTICS_ENABLE |
  79.              GEN6_GS_RENDERING_ENABLE);
  80.    OUT_BATCH(GEN6_GS_SVBI_PAYLOAD_ENABLE |
  81.              GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
  82.              (brw->ff_gs.prog_data->svbi_postincrement_value <<
  83.               GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
  84.              GEN6_GS_ENABLE);
  85.    ADVANCE_BATCH();
  86. }
  87.  
  88. static void
  89. upload_gs_state(struct brw_context *brw)
  90. {
  91.    /* BRW_NEW_GEOMETRY_PROGRAM */
  92.    bool active = brw->geometry_program;
  93.    /* BRW_NEW_GS_PROG_DATA */
  94.    const struct brw_vue_prog_data *prog_data = &brw->gs.prog_data->base;
  95.    const struct brw_stage_state *stage_state = &brw->gs.base;
  96.  
  97.    if (!active || stage_state->push_const_size == 0) {
  98.       /* Disable the push constant buffers. */
  99.       BEGIN_BATCH(5);
  100.       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
  101.       OUT_BATCH(0);
  102.       OUT_BATCH(0);
  103.       OUT_BATCH(0);
  104.       OUT_BATCH(0);
  105.       ADVANCE_BATCH();
  106.    } else {
  107.       BEGIN_BATCH(5);
  108.       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 |
  109.                 GEN6_CONSTANT_BUFFER_0_ENABLE |
  110.                 (5 - 2));
  111.       /* Pointer to the GS constant buffer.  Covered by the set of
  112.        * state flags from gen6_upload_vs_constants
  113.        */
  114.       OUT_BATCH(stage_state->push_const_offset +
  115.                 stage_state->push_const_size - 1);
  116.       OUT_BATCH(0);
  117.       OUT_BATCH(0);
  118.       OUT_BATCH(0);
  119.       ADVANCE_BATCH();
  120.    }
  121.  
  122.    if (active) {
  123.       BEGIN_BATCH(7);
  124.       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  125.       OUT_BATCH(stage_state->prog_offset);
  126.  
  127.       /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled as it
  128.        * was previously done for gen6.
  129.        *
  130.        * TODO: test with both disabled to see if the HW is behaving
  131.        * as expected, like in gen7.
  132.        */
  133.       OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE |
  134.                 ((ALIGN(stage_state->sampler_count, 4)/4) <<
  135.                  GEN6_GS_SAMPLER_COUNT_SHIFT) |
  136.                 ((prog_data->base.binding_table.size_bytes / 4) <<
  137.                  GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
  138.  
  139.       if (prog_data->base.total_scratch) {
  140.          OUT_RELOC(stage_state->scratch_bo,
  141.                    I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
  142.                    ffs(prog_data->base.total_scratch) - 11);
  143.       } else {
  144.          OUT_BATCH(0); /* no scratch space */
  145.       }
  146.  
  147.       OUT_BATCH((prog_data->urb_read_length <<
  148.                  GEN6_GS_URB_READ_LENGTH_SHIFT) |
  149.                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT) |
  150.                 (prog_data->base.dispatch_grf_start_reg <<
  151.                  GEN6_GS_DISPATCH_START_GRF_SHIFT));
  152.  
  153.       OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
  154.                 GEN6_GS_STATISTICS_ENABLE |
  155.                 GEN6_GS_SO_STATISTICS_ENABLE |
  156.                 GEN6_GS_RENDERING_ENABLE);
  157.  
  158.       if (brw->gs.prog_data->gen6_xfb_enabled) {
  159.          /* GEN6_GS_REORDER is equivalent to GEN7_GS_REORDER_TRAILING
  160.           * in gen7. SNB and IVB specs are the same regarding the reordering of
  161.           * TRISTRIP/TRISTRIP_REV vertices and triangle orientation, so we do
  162.           * the same thing in both generations. For more details, see the
  163.           * comment in gen7_gs_state.c
  164.           */
  165.          OUT_BATCH(GEN6_GS_REORDER |
  166.                    GEN6_GS_SVBI_PAYLOAD_ENABLE |
  167.                    GEN6_GS_ENABLE);
  168.       } else {
  169.          OUT_BATCH(GEN6_GS_REORDER | GEN6_GS_ENABLE);
  170.       }
  171.       ADVANCE_BATCH();
  172.    } else if (brw->ff_gs.prog_active) {
  173.       /* In gen6, transform feedback for the VS stage is done with an ad-hoc GS
  174.        * program. This function provides the needed 3DSTATE_GS for this.
  175.        */
  176.       upload_gs_state_for_tf(brw);
  177.    } else {
  178.       /* No GS function required */
  179.       BEGIN_BATCH(7);
  180.       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  181.       OUT_BATCH(0); /* prog_bo */
  182.       OUT_BATCH((0 << GEN6_GS_SAMPLER_COUNT_SHIFT) |
  183.                 (0 << GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
  184.       OUT_BATCH(0); /* scratch space base offset */
  185.       OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
  186.                 (0 << GEN6_GS_URB_READ_LENGTH_SHIFT) |
  187.                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT));
  188.       OUT_BATCH((0 << GEN6_GS_MAX_THREADS_SHIFT) |
  189.                 GEN6_GS_STATISTICS_ENABLE |
  190.                 GEN6_GS_RENDERING_ENABLE);
  191.                 OUT_BATCH(0);
  192.       ADVANCE_BATCH();
  193.    }
  194.    brw->gs.enabled = active;
  195. }
  196.  
  197. const struct brw_tracked_state gen6_gs_state = {
  198.    .dirty = {
  199.       .mesa  = _NEW_PROGRAM_CONSTANTS |
  200.                _NEW_TRANSFORM,
  201.       .brw   = BRW_NEW_BATCH |
  202.                BRW_NEW_CONTEXT |
  203.                BRW_NEW_FF_GS_PROG_DATA |
  204.                BRW_NEW_GEOMETRY_PROGRAM |
  205.                BRW_NEW_GS_PROG_DATA |
  206.                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
  207.    },
  208.    .emit = upload_gs_state,
  209. };
  210.