src/gallium/auxiliary/tgsi/tgsi_from_mesa.c

   1 /*
   2  * Copyright 2017 Advanced Micro Devices, Inc.
   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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "tgsi/tgsi_from_mesa.h"
  25
  26 #include "pipe/p_compiler.h"
  27
  28 /**
  29  * Determine the semantic index that is used when the given varying is mapped
  30  * to TGSI_SEMANTIC_GENERIC.
  31  */
  32 unsigned
  33 tgsi_get_generic_gl_varying_index(gl_varying_slot attr,
  34                                   bool needs_texcoord_semantic)
  35 {
  36    if (attr >= VARYING_SLOT_VAR0) {
  37       if (needs_texcoord_semantic)
  38          return attr - VARYING_SLOT_VAR0;
  39       else
  40          return 9 + (attr - VARYING_SLOT_VAR0);
  41    }
  42    if (attr == VARYING_SLOT_PNTC) {
  43       assert(!needs_texcoord_semantic);
  44       return 8;
  45    }
  46    if (attr >= VARYING_SLOT_TEX0 && attr <= VARYING_SLOT_TEX7) {
  47       assert(!needs_texcoord_semantic);
  48       return attr - VARYING_SLOT_TEX0;
  49    }
  50
  51    assert(0);
  52    return 0;
  53 }
  54
  55 /**
  56  * Determine the semantic name and index used for the given varying.
  57  */
  58 void
  59 tgsi_get_gl_varying_semantic(gl_varying_slot attr,
  60                              bool needs_texcoord_semantic,
  61                              unsigned *semantic_name,
  62                              unsigned *semantic_index)
  63 {
  64    switch (attr) {
  65    case VARYING_SLOT_POS:
  66       *semantic_name = TGSI_SEMANTIC_POSITION;
  67       *semantic_index = 0;
  68       break;
  69    case VARYING_SLOT_COL0:
  70       *semantic_name = TGSI_SEMANTIC_COLOR;
  71       *semantic_index = 0;
  72       break;
  73    case VARYING_SLOT_COL1:
  74       *semantic_name = TGSI_SEMANTIC_COLOR;
  75       *semantic_index = 1;
  76       break;
  77    case VARYING_SLOT_BFC0:
  78       *semantic_name = TGSI_SEMANTIC_BCOLOR;
  79       *semantic_index = 0;
  80       break;
  81    case VARYING_SLOT_BFC1:
  82       *semantic_name = TGSI_SEMANTIC_BCOLOR;
  83       *semantic_index = 1;
  84       break;
  85    case VARYING_SLOT_FOGC:
  86       *semantic_name = TGSI_SEMANTIC_FOG;
  87       *semantic_index = 0;
  88       break;
  89    case VARYING_SLOT_PSIZ:
  90       *semantic_name = TGSI_SEMANTIC_PSIZE;
  91       *semantic_index = 0;
  92       break;
  93    case VARYING_SLOT_CLIP_DIST0:
  94       *semantic_name = TGSI_SEMANTIC_CLIPDIST;
  95       *semantic_index = 0;
  96       break;
  97    case VARYING_SLOT_CLIP_DIST1:
  98       *semantic_name = TGSI_SEMANTIC_CLIPDIST;
  99       *semantic_index = 1;
 100       break;
 101    case VARYING_SLOT_CULL_DIST0:
 102    case VARYING_SLOT_CULL_DIST1:
 103       /* these should have been lowered by GLSL */
 104       assert(0);
 105       break;
 106    case VARYING_SLOT_EDGE:
 107       *semantic_name = TGSI_SEMANTIC_EDGEFLAG;
 108       *semantic_index = 0;
 109       break;
 110    case VARYING_SLOT_CLIP_VERTEX:
 111       *semantic_name = TGSI_SEMANTIC_CLIPVERTEX;
 112       *semantic_index = 0;
 113       break;
 114    case VARYING_SLOT_LAYER:
 115       *semantic_name = TGSI_SEMANTIC_LAYER;
 116       *semantic_index = 0;
 117       break;
 118    case VARYING_SLOT_VIEWPORT:
 119       *semantic_name = TGSI_SEMANTIC_VIEWPORT_INDEX;
 120       *semantic_index = 0;
 121       break;
 122    case VARYING_SLOT_PNTC:
 123       *semantic_name = TGSI_SEMANTIC_PCOORD;
 124       *semantic_index = 0;
 125       break;
 126
 127    case VARYING_SLOT_TEX0:
 128    case VARYING_SLOT_TEX1:
 129    case VARYING_SLOT_TEX2:
 130    case VARYING_SLOT_TEX3:
 131    case VARYING_SLOT_TEX4:
 132    case VARYING_SLOT_TEX5:
 133    case VARYING_SLOT_TEX6:
 134    case VARYING_SLOT_TEX7:
 135       if (needs_texcoord_semantic) {
 136          *semantic_name = TGSI_SEMANTIC_TEXCOORD;
 137          *semantic_index = attr - VARYING_SLOT_TEX0;
 138          break;
 139       }
 140       /* fall through */
 141    case VARYING_SLOT_VAR0:
 142    default:
 143       assert(attr >= VARYING_SLOT_VAR0 ||
 144              (attr >= VARYING_SLOT_TEX0 && attr <= VARYING_SLOT_TEX7));
 145       *semantic_name = TGSI_SEMANTIC_GENERIC;
 146       *semantic_index =
 147          tgsi_get_generic_gl_varying_index(attr, needs_texcoord_semantic);
 148       break;
 149    }
 150 }
 151
 152 /**
 153  * Determine the semantic name and index used for the given fragment shader
 154  * result.
 155  */
 156 void
 157 tgsi_get_gl_frag_result_semantic(gl_frag_result frag_result,
 158                                  unsigned *semantic_name,
 159                                  unsigned *semantic_index)
 160 {
 161    if (frag_result >= FRAG_RESULT_DATA0) {
 162       *semantic_name = TGSI_SEMANTIC_COLOR;
 163       *semantic_index = frag_result - FRAG_RESULT_DATA0;
 164       return;
 165    }
 166
 167    *semantic_index = 0;
 168
 169    switch (frag_result) {
 170    case FRAG_RESULT_DEPTH:
 171       *semantic_name = TGSI_SEMANTIC_POSITION;
 172       break;
 173    case FRAG_RESULT_STENCIL:
 174       *semantic_name = TGSI_SEMANTIC_STENCIL;
 175       break;
 176    case FRAG_RESULT_COLOR:
 177       *semantic_name = TGSI_SEMANTIC_COLOR;
 178       break;
 179    case FRAG_RESULT_SAMPLE_MASK:
 180       *semantic_name = TGSI_SEMANTIC_SAMPLEMASK;
 181       break;
 182    default:
 183       assert(false);
 184    }
 185 }