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    /* BRW_NEW_GEOMETRY_PROGRAM */
  37    const struct brw_geometry_program *gp =
  38       (struct brw_geometry_program *) brw->geometry_program;
  39
  40    if (gp) {
  41       /* CACHE_NEW_GS_PROG */
  42       struct brw_stage_state *stage_state = &brw->gs.base;
  43       struct brw_stage_prog_data *prog_data = &brw->gs.prog_data->base.base;
  44
  45       gen6_upload_push_constants(brw, &gp->program.Base, prog_data,
  46                                  stage_state, AUB_TRACE_VS_CONSTANTS);
  47    }
  48 }
  49
  50 const struct brw_tracked_state gen6_gs_push_constants = {
  51    .dirty = {
  52       .mesa  = _NEW_TRANSFORM | _NEW_PROGRAM_CONSTANTS,
  53       .brw   = (BRW_NEW_BATCH |
  54                 BRW_NEW_GEOMETRY_PROGRAM |
  55                 BRW_NEW_PUSH_CONSTANT_ALLOCATION),
  56       .cache = CACHE_NEW_GS_PROG,
  57    },
  58    .emit = gen6_upload_gs_push_constants,
  59 };
  60
  61 static void
  62 upload_gs_state_for_tf(struct brw_context *brw)
  63 {
  64    BEGIN_BATCH(7);
  65    OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  66    OUT_BATCH(brw->ff_gs.prog_offset);
  67    OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE);
  68    OUT_BATCH(0); /* no scratch space */
  69    OUT_BATCH((2 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
  70              (brw->ff_gs.prog_data->urb_read_length << GEN6_GS_URB_READ_LENGTH_SHIFT));
  71    OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
  72              GEN6_GS_STATISTICS_ENABLE |
  73              GEN6_GS_SO_STATISTICS_ENABLE |
  74              GEN6_GS_RENDERING_ENABLE);
  75    OUT_BATCH(GEN6_GS_SVBI_PAYLOAD_ENABLE |
  76              GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
  77              (brw->ff_gs.prog_data->svbi_postincrement_value <<
  78               GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
  79              GEN6_GS_ENABLE);
  80    ADVANCE_BATCH();
  81 }
  82
  83 static void
  84 upload_gs_state(struct brw_context *brw)
  85 {
  86    /* BRW_NEW_GEOMETRY_PROGRAM */
  87    bool active = brw->geometry_program;
  88    /* CACHE_NEW_GS_PROG */
  89    const struct brw_vec4_prog_data *prog_data = &brw->gs.prog_data->base;
  90    const struct brw_stage_state *stage_state = &brw->gs.base;
  91
  92    if (!active || stage_state->push_const_size == 0) {
  93       /* Disable the push constant buffers. */
  94       BEGIN_BATCH(5);
  95       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
  96       OUT_BATCH(0);
  97       OUT_BATCH(0);
  98       OUT_BATCH(0);
  99       OUT_BATCH(0);
 100       ADVANCE_BATCH();
 101    } else {
 102       BEGIN_BATCH(5);
 103       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 |
 104                 GEN6_CONSTANT_BUFFER_0_ENABLE |
 105                 (5 - 2));
 106       /* Pointer to the GS constant buffer.  Covered by the set of
 107        * state flags from gen6_upload_vs_constants
 108        */
 109       OUT_BATCH(stage_state->push_const_offset +
 110                 stage_state->push_const_size - 1);
 111       OUT_BATCH(0);
 112       OUT_BATCH(0);
 113       OUT_BATCH(0);
 114       ADVANCE_BATCH();
 115    }
 116
 117    if (active) {
 118       BEGIN_BATCH(7);
 119       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
 120       OUT_BATCH(stage_state->prog_offset);
 121
 122       /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled as it
 123        * was previously done for gen6.
 124        *
 125        * TODO: test with both disabled to see if the HW is behaving
 126        * as expected, like in gen7.
 127        */
 128       OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE |
 129                 ((ALIGN(stage_state->sampler_count, 4)/4) <<
 130                  GEN6_GS_SAMPLER_COUNT_SHIFT) |
 131                 ((prog_data->base.binding_table.size_bytes / 4) <<
 132                  GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
 133
 134       if (prog_data->base.total_scratch) {
 135          OUT_RELOC(stage_state->scratch_bo,
 136                    I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
 137                    ffs(prog_data->base.total_scratch) - 11);
 138       } else {
 139          OUT_BATCH(0); /* no scratch space */
 140       }
 141
 142       OUT_BATCH((prog_data->urb_read_length <<
 143                  GEN6_GS_URB_READ_LENGTH_SHIFT) |
 144                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT) |
 145                 (prog_data->base.dispatch_grf_start_reg <<
 146                  GEN6_GS_DISPATCH_START_GRF_SHIFT));
 147
 148       OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
 149                 GEN6_GS_STATISTICS_ENABLE |
 150                 GEN6_GS_SO_STATISTICS_ENABLE |
 151                 GEN6_GS_RENDERING_ENABLE);
 152
 153       /* FIXME: Enable SVBI payload only when TF is enable in SNB for
 154        * user-provided GS.
 155        */
 156       if (0) {
 157          /* GEN6_GS_REORDER is equivalent to GEN7_GS_REORDER_TRAILING
 158           * in gen7. SNB and IVB specs are the same regarding the reordering of
 159           * TRISTRIP/TRISTRIP_REV vertices and triangle orientation, so we do
 160           * the same thing in both generations. For more details, see the
 161           * comment in gen7_gs_state.c
 162           */
 163          OUT_BATCH(GEN6_GS_REORDER |
 164                    GEN6_GS_SVBI_PAYLOAD_ENABLE |
 165                    GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
 166                    /* FIXME: prog_data->svbi_postincrement_value instead of 0 */
 167                    (0 << GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
 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_TRANSFORM | _NEW_PROGRAM_CONSTANTS,
 201       .brw   = BRW_NEW_CONTEXT | BRW_NEW_PUSH_CONSTANT_ALLOCATION,
 202       .cache = (CACHE_NEW_GS_PROG | CACHE_NEW_FF_GS_PROG)
 203    },
 204    .emit = upload_gs_state,
 205 };