src/mesa/drivers/dri/i965/gen6_gs_state.c

   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 #include "main/shaderapi.h"
  33
  34 static void
  35 gen6_upload_gs_push_constants(struct brw_context *brw)
  36 {
  37    struct brw_stage_state *stage_state = &brw->gs.base;
  38
  39    /* BRW_NEW_GEOMETRY_PROGRAM */
  40    const struct brw_geometry_program *gp =
  41       (struct brw_geometry_program *) brw->geometry_program;
  42
  43    if (gp) {
  44       /* BRW_NEW_GS_PROG_DATA */
  45       struct brw_stage_prog_data *prog_data = &brw->gs.prog_data->base.base;
  46
  47       _mesa_shader_write_subroutine_indices(&brw->ctx, MESA_SHADER_GEOMETRY);
  48       gen6_upload_push_constants(brw, &gp->program.Base, prog_data,
  49                                  stage_state, AUB_TRACE_VS_CONSTANTS);
  50    }
  51
  52    if (brw->gen >= 7)
  53       gen7_upload_constant_state(brw, stage_state, gp, _3DSTATE_CONSTANT_GS);
  54 }
  55
  56 const struct brw_tracked_state gen6_gs_push_constants = {
  57    .dirty = {
  58       .mesa  = _NEW_PROGRAM_CONSTANTS |
  59                _NEW_TRANSFORM,
  60       .brw   = BRW_NEW_BATCH |
  61                BRW_NEW_BLORP |
  62                BRW_NEW_GEOMETRY_PROGRAM |
  63                BRW_NEW_GS_PROG_DATA |
  64                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
  65    },
  66    .emit = gen6_upload_gs_push_constants,
  67 };
  68
  69 static void
  70 upload_gs_state_for_tf(struct brw_context *brw)
  71 {
  72    BEGIN_BATCH(7);
  73    OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  74    OUT_BATCH(brw->ff_gs.prog_offset);
  75    OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE);
  76    OUT_BATCH(0); /* no scratch space */
  77    OUT_BATCH((2 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
  78              (brw->ff_gs.prog_data->urb_read_length << GEN6_GS_URB_READ_LENGTH_SHIFT));
  79    OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
  80              GEN6_GS_STATISTICS_ENABLE |
  81              GEN6_GS_SO_STATISTICS_ENABLE |
  82              GEN6_GS_RENDERING_ENABLE);
  83    OUT_BATCH(GEN6_GS_SVBI_PAYLOAD_ENABLE |
  84              GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
  85              (brw->ff_gs.prog_data->svbi_postincrement_value <<
  86               GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
  87              GEN6_GS_ENABLE);
  88    ADVANCE_BATCH();
  89 }
  90
  91 static void
  92 upload_gs_state(struct brw_context *brw)
  93 {
  94    /* BRW_NEW_GEOMETRY_PROGRAM */
  95    bool active = brw->geometry_program;
  96    /* BRW_NEW_GS_PROG_DATA */
  97    const struct brw_vue_prog_data *prog_data = &brw->gs.prog_data->base;
  98    const struct brw_stage_state *stage_state = &brw->gs.base;
  99
 100    if (!active || stage_state->push_const_size == 0) {
 101       /* Disable the push constant buffers. */
 102       BEGIN_BATCH(5);
 103       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
 104       OUT_BATCH(0);
 105       OUT_BATCH(0);
 106       OUT_BATCH(0);
 107       OUT_BATCH(0);
 108       ADVANCE_BATCH();
 109    } else {
 110       BEGIN_BATCH(5);
 111       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 |
 112                 GEN6_CONSTANT_BUFFER_0_ENABLE |
 113                 (5 - 2));
 114       /* Pointer to the GS constant buffer.  Covered by the set of
 115        * state flags from gen6_upload_vs_constants
 116        */
 117       OUT_BATCH(stage_state->push_const_offset +
 118                 stage_state->push_const_size - 1);
 119       OUT_BATCH(0);
 120       OUT_BATCH(0);
 121       OUT_BATCH(0);
 122       ADVANCE_BATCH();
 123    }
 124
 125    if (active) {
 126       BEGIN_BATCH(7);
 127       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
 128       OUT_BATCH(stage_state->prog_offset);
 129
 130       /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled as it
 131        * was previously done for gen6.
 132        *
 133        * TODO: test with both disabled to see if the HW is behaving
 134        * as expected, like in gen7.
 135        */
 136       OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE |
 137                 ((ALIGN(stage_state->sampler_count, 4)/4) <<
 138                  GEN6_GS_SAMPLER_COUNT_SHIFT) |
 139                 ((prog_data->base.binding_table.size_bytes / 4) <<
 140                  GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
 141
 142       if (prog_data->base.total_scratch) {
 143          OUT_RELOC(stage_state->scratch_bo,
 144                    I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
 145                    ffs(stage_state->per_thread_scratch) - 11);
 146       } else {
 147          OUT_BATCH(0); /* no scratch space */
 148       }
 149
 150       OUT_BATCH((prog_data->urb_read_length <<
 151                  GEN6_GS_URB_READ_LENGTH_SHIFT) |
 152                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT) |
 153                 (prog_data->base.dispatch_grf_start_reg <<
 154                  GEN6_GS_DISPATCH_START_GRF_SHIFT));
 155
 156       OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
 157                 GEN6_GS_STATISTICS_ENABLE |
 158                 GEN6_GS_SO_STATISTICS_ENABLE |
 159                 GEN6_GS_RENDERING_ENABLE);
 160
 161       if (brw->gs.prog_data->gen6_xfb_enabled) {
 162          /* GEN6_GS_REORDER is equivalent to GEN7_GS_REORDER_TRAILING
 163           * in gen7. SNB and IVB specs are the same regarding the reordering of
 164           * TRISTRIP/TRISTRIP_REV vertices and triangle orientation, so we do
 165           * the same thing in both generations. For more details, see the
 166           * comment in gen7_gs_state.c
 167           */
 168          OUT_BATCH(GEN6_GS_REORDER |
 169                    GEN6_GS_SVBI_PAYLOAD_ENABLE |
 170                    GEN6_GS_ENABLE);
 171       } else {
 172          OUT_BATCH(GEN6_GS_REORDER | GEN6_GS_ENABLE);
 173       }
 174       ADVANCE_BATCH();
 175    } else if (brw->ff_gs.prog_active) {
 176       /* In gen6, transform feedback for the VS stage is done with an ad-hoc GS
 177        * program. This function provides the needed 3DSTATE_GS for this.
 178        */
 179       upload_gs_state_for_tf(brw);
 180    } else {
 181       /* No GS function required */
 182       BEGIN_BATCH(7);
 183       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
 184       OUT_BATCH(0); /* prog_bo */
 185       OUT_BATCH((0 << GEN6_GS_SAMPLER_COUNT_SHIFT) |
 186                 (0 << GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
 187       OUT_BATCH(0); /* scratch space base offset */
 188       OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
 189                 (0 << GEN6_GS_URB_READ_LENGTH_SHIFT) |
 190                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT));
 191       OUT_BATCH((0 << GEN6_GS_MAX_THREADS_SHIFT) |
 192                 GEN6_GS_STATISTICS_ENABLE |
 193                 GEN6_GS_RENDERING_ENABLE);
 194                 OUT_BATCH(0);
 195       ADVANCE_BATCH();
 196    }
 197    brw->gs.enabled = active;
 198 }
 199
 200 const struct brw_tracked_state gen6_gs_state = {
 201    .dirty = {
 202       .mesa  = _NEW_PROGRAM_CONSTANTS |
 203                _NEW_TRANSFORM,
 204       .brw   = BRW_NEW_BATCH |
 205                BRW_NEW_BLORP |
 206                BRW_NEW_CONTEXT |
 207                BRW_NEW_FF_GS_PROG_DATA |
 208                BRW_NEW_GEOMETRY_PROGRAM |
 209                BRW_NEW_GS_PROG_DATA |
 210                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
 211    },
 212    .emit = upload_gs_state,
 213 };