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 upload_gs_state_for_tf(struct brw_context *brw)
  35 {
  36    BEGIN_BATCH(7);
  37    OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  38    OUT_BATCH(brw->ff_gs.prog_offset);
  39    OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE);
  40    OUT_BATCH(0); /* no scratch space */
  41    OUT_BATCH((2 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
  42              (brw->ff_gs.prog_data->urb_read_length << GEN6_GS_URB_READ_LENGTH_SHIFT));
  43    OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
  44              GEN6_GS_STATISTICS_ENABLE |
  45              GEN6_GS_SO_STATISTICS_ENABLE |
  46              GEN6_GS_RENDERING_ENABLE);
  47    OUT_BATCH(GEN6_GS_SVBI_PAYLOAD_ENABLE |
  48              GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
  49              (brw->ff_gs.prog_data->svbi_postincrement_value <<
  50               GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
  51              GEN6_GS_ENABLE);
  52    ADVANCE_BATCH();
  53 }
  54
  55 static void
  56 upload_gs_state(struct brw_context *brw)
  57 {
  58    /* BRW_NEW_GEOMETRY_PROGRAM */
  59    bool active = brw->geometry_program;
  60    /* CACHE_NEW_GS_PROG */
  61    const struct brw_vec4_prog_data *prog_data = &brw->gs.prog_data->base;
  62    const struct brw_stage_state *stage_state = &brw->gs.base;
  63
  64    if (active) {
  65       /* FIXME: enable constant buffers */
  66       BEGIN_BATCH(5);
  67       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
  68       OUT_BATCH(0);
  69       OUT_BATCH(0);
  70       OUT_BATCH(0);
  71       OUT_BATCH(0);
  72       ADVANCE_BATCH();
  73
  74       BEGIN_BATCH(7);
  75       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  76       OUT_BATCH(stage_state->prog_offset);
  77
  78       /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled as it
  79        * was previously done for gen6.
  80        *
  81        * TODO: test with both disabled to see if the HW is behaving
  82        * as expected, like in gen7.
  83        */
  84       OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE |
  85                 ((ALIGN(stage_state->sampler_count, 4)/4) <<
  86                  GEN6_GS_SAMPLER_COUNT_SHIFT) |
  87                 ((prog_data->base.binding_table.size_bytes / 4) <<
  88                  GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
  89
  90       if (prog_data->base.total_scratch) {
  91          OUT_RELOC(stage_state->scratch_bo,
  92                    I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
  93                    ffs(prog_data->base.total_scratch) - 11);
  94       } else {
  95          OUT_BATCH(0); /* no scratch space */
  96       }
  97
  98       OUT_BATCH((prog_data->urb_read_length <<
  99                  GEN6_GS_URB_READ_LENGTH_SHIFT) |
 100                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT) |
 101                 (prog_data->base.dispatch_grf_start_reg <<
 102                  GEN6_GS_DISPATCH_START_GRF_SHIFT));
 103
 104       OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
 105                 GEN6_GS_STATISTICS_ENABLE |
 106                 GEN6_GS_SO_STATISTICS_ENABLE |
 107                 GEN6_GS_RENDERING_ENABLE);
 108
 109       /* FIXME: Enable SVBI payload only when TF is enable in SNB for
 110        * user-provided GS.
 111        */
 112       if (0) {
 113          /* GEN6_GS_REORDER is equivalent to GEN7_GS_REORDER_TRAILING
 114           * in gen7. SNB and IVB specs are the same regarding the reordering of
 115           * TRISTRIP/TRISTRIP_REV vertices and triangle orientation, so we do
 116           * the same thing in both generations. For more details, see the
 117           * comment in gen7_gs_state.c
 118           */
 119          OUT_BATCH(GEN6_GS_REORDER |
 120                    GEN6_GS_SVBI_PAYLOAD_ENABLE |
 121                    GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
 122                    /* FIXME: prog_data->svbi_postincrement_value instead of 0 */
 123                    (0 << GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
 124                    GEN6_GS_ENABLE);
 125       } else {
 126          OUT_BATCH(GEN6_GS_REORDER | GEN6_GS_ENABLE);
 127       }
 128       ADVANCE_BATCH();
 129    } else {
 130       /* Disable all the constant buffers. */
 131       BEGIN_BATCH(5);
 132       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
 133       OUT_BATCH(0);
 134       OUT_BATCH(0);
 135       OUT_BATCH(0);
 136       OUT_BATCH(0);
 137       ADVANCE_BATCH();
 138
 139       if (brw->ff_gs.prog_active) {
 140          /* In gen6, transform feedback for the VS stage is done with an ad-hoc GS
 141           * program. This function provides the needed 3DSTATE_GS for this.
 142           */
 143          upload_gs_state_for_tf(brw);
 144       } else {
 145          /* No GS function required */
 146          BEGIN_BATCH(7);
 147          OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
 148          OUT_BATCH(0); /* prog_bo */
 149          OUT_BATCH((0 << GEN6_GS_SAMPLER_COUNT_SHIFT) |
 150                    (0 << GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
 151          OUT_BATCH(0); /* scratch space base offset */
 152          OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
 153                    (0 << GEN6_GS_URB_READ_LENGTH_SHIFT) |
 154                    (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT));
 155          OUT_BATCH((0 << GEN6_GS_MAX_THREADS_SHIFT) |
 156                    GEN6_GS_STATISTICS_ENABLE |
 157                    GEN6_GS_RENDERING_ENABLE);
 158          OUT_BATCH(0);
 159          ADVANCE_BATCH();
 160       }
 161    }
 162    brw->gs.enabled = active;
 163 }
 164
 165 const struct brw_tracked_state gen6_gs_state = {
 166    .dirty = {
 167       .mesa  = _NEW_TRANSFORM,
 168       .brw   = BRW_NEW_CONTEXT | BRW_NEW_PUSH_CONSTANT_ALLOCATION,
 169       .cache = (CACHE_NEW_GS_PROG | CACHE_NEW_FF_GS_PROG)
 170    },
 171    .emit = upload_gs_state,
 172 };