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