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_PRIMITIVE_ID:
  66       *semantic_name = TGSI_SEMANTIC_PRIMID;
  67       *semantic_index = 0;
  68       break;
  69    case VARYING_SLOT_POS:
  70       *semantic_name = TGSI_SEMANTIC_POSITION;
  71       *semantic_index = 0;
  72       break;
  73    case VARYING_SLOT_COL0:
  74       *semantic_name = TGSI_SEMANTIC_COLOR;
  75       *semantic_index = 0;
  76       break;
  77    case VARYING_SLOT_COL1:
  78       *semantic_name = TGSI_SEMANTIC_COLOR;
  79       *semantic_index = 1;
  80       break;
  81    case VARYING_SLOT_BFC0:
  82       *semantic_name = TGSI_SEMANTIC_BCOLOR;
  83       *semantic_index = 0;
  84       break;
  85    case VARYING_SLOT_BFC1:
  86       *semantic_name = TGSI_SEMANTIC_BCOLOR;
  87       *semantic_index = 1;
  88       break;
  89    case VARYING_SLOT_FOGC:
  90       *semantic_name = TGSI_SEMANTIC_FOG;
  91       *semantic_index = 0;
  92       break;
  93    case VARYING_SLOT_PSIZ:
  94       *semantic_name = TGSI_SEMANTIC_PSIZE;
  95       *semantic_index = 0;
  96       break;
  97    case VARYING_SLOT_CLIP_DIST0:
  98       *semantic_name = TGSI_SEMANTIC_CLIPDIST;
  99       *semantic_index = 0;
 100       break;
 101    case VARYING_SLOT_CLIP_DIST1:
 102       *semantic_name = TGSI_SEMANTIC_CLIPDIST;
 103       *semantic_index = 1;
 104       break;
 105    case VARYING_SLOT_CULL_DIST0:
 106    case VARYING_SLOT_CULL_DIST1:
 107       /* these should have been lowered by GLSL */
 108       assert(0);
 109       break;
 110    case VARYING_SLOT_EDGE:
 111       *semantic_name = TGSI_SEMANTIC_EDGEFLAG;
 112       *semantic_index = 0;
 113       break;
 114    case VARYING_SLOT_CLIP_VERTEX:
 115       *semantic_name = TGSI_SEMANTIC_CLIPVERTEX;
 116       *semantic_index = 0;
 117       break;
 118    case VARYING_SLOT_LAYER:
 119       *semantic_name = TGSI_SEMANTIC_LAYER;
 120       *semantic_index = 0;
 121       break;
 122    case VARYING_SLOT_VIEWPORT:
 123       *semantic_name = TGSI_SEMANTIC_VIEWPORT_INDEX;
 124       *semantic_index = 0;
 125       break;
 126    case VARYING_SLOT_PNTC:
 127       *semantic_name = TGSI_SEMANTIC_PCOORD;
 128       *semantic_index = 0;
 129       break;
 130    case VARYING_SLOT_TESS_LEVEL_OUTER:
 131       *semantic_name = TGSI_SEMANTIC_TESSOUTER;
 132       *semantic_index = 0;
 133       break;
 134    case VARYING_SLOT_TESS_LEVEL_INNER:
 135       *semantic_name = TGSI_SEMANTIC_TESSINNER;
 136       *semantic_index = 0;
 137       break;
 138
 139    case VARYING_SLOT_TEX0:
 140    case VARYING_SLOT_TEX1:
 141    case VARYING_SLOT_TEX2:
 142    case VARYING_SLOT_TEX3:
 143    case VARYING_SLOT_TEX4:
 144    case VARYING_SLOT_TEX5:
 145    case VARYING_SLOT_TEX6:
 146    case VARYING_SLOT_TEX7:
 147       if (needs_texcoord_semantic) {
 148          *semantic_name = TGSI_SEMANTIC_TEXCOORD;
 149          *semantic_index = attr - VARYING_SLOT_TEX0;
 150          break;
 151       }
 152       /* fall through */
 153    case VARYING_SLOT_VAR0:
 154    default:
 155       assert(attr >= VARYING_SLOT_VAR0 ||
 156              (attr >= VARYING_SLOT_TEX0 && attr <= VARYING_SLOT_TEX7));
 157       if (attr >= VARYING_SLOT_PATCH0) {
 158          *semantic_name = TGSI_SEMANTIC_PATCH;
 159          *semantic_index = attr - VARYING_SLOT_PATCH0;
 160       } else {
 161          *semantic_name = TGSI_SEMANTIC_GENERIC;
 162          *semantic_index =
 163             tgsi_get_generic_gl_varying_index(attr, needs_texcoord_semantic);
 164       }
 165       break;
 166    }
 167 }
 168
 169 /**
 170  * Determine the semantic name and index used for the given fragment shader
 171  * result.
 172  */
 173 void
 174 tgsi_get_gl_frag_result_semantic(gl_frag_result frag_result,
 175                                  unsigned *semantic_name,
 176                                  unsigned *semantic_index)
 177 {
 178    if (frag_result >= FRAG_RESULT_DATA0) {
 179       *semantic_name = TGSI_SEMANTIC_COLOR;
 180       *semantic_index = frag_result - FRAG_RESULT_DATA0;
 181       return;
 182    }
 183
 184    *semantic_index = 0;
 185
 186    switch (frag_result) {
 187    case FRAG_RESULT_DEPTH:
 188       *semantic_name = TGSI_SEMANTIC_POSITION;
 189       break;
 190    case FRAG_RESULT_STENCIL:
 191       *semantic_name = TGSI_SEMANTIC_STENCIL;
 192       break;
 193    case FRAG_RESULT_COLOR:
 194       *semantic_name = TGSI_SEMANTIC_COLOR;
 195       break;
 196    case FRAG_RESULT_SAMPLE_MASK:
 197       *semantic_name = TGSI_SEMANTIC_SAMPLEMASK;
 198       break;
 199    default:
 200       assert(false);
 201    }
 202 }