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 */
32unsigned
33tgsi_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 */
58void
59tgsi_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 */
173void
174tgsi_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}
203