tgsi_scan.c revision 3464ebd5 
1/**************************************************************************
2 *
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 * Copyright 2008 VMware, Inc.  All rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28
29/**
30 * TGSI program scan utility.
31 * Used to determine which registers and instructions are used by a shader.
32 *
33 * Authors:  Brian Paul
34 */
35
36
37#include "util/u_math.h"
38#include "tgsi/tgsi_parse.h"
39#include "tgsi/tgsi_util.h"
40#include "tgsi/tgsi_scan.h"
41
42
43
44
45/**
46 * Scan the given TGSI shader to collect information such as number of
47 * registers used, special instructions used, etc.
48 * \return info  the result of the scan
49 */
50void
51tgsi_scan_shader(const struct tgsi_token *tokens,
52                 struct tgsi_shader_info *info)
53{
54   uint procType, i;
55   struct tgsi_parse_context parse;
56
57   memset(info, 0, sizeof(*info));
58   for (i = 0; i < TGSI_FILE_COUNT; i++)
59      info->file_max[i] = -1;
60
61   /**
62    ** Setup to begin parsing input shader
63    **/
64   if (tgsi_parse_init( &parse, tokens ) != TGSI_PARSE_OK) {
65      debug_printf("tgsi_parse_init() failed in tgsi_scan_shader()!\n");
66      return;
67   }
68   procType = parse.FullHeader.Processor.Processor;
69   assert(procType == TGSI_PROCESSOR_FRAGMENT ||
70          procType == TGSI_PROCESSOR_VERTEX ||
71          procType == TGSI_PROCESSOR_GEOMETRY);
72
73
74   /**
75    ** Loop over incoming program tokens/instructions
76    */
77   while( !tgsi_parse_end_of_tokens( &parse ) ) {
78
79      info->num_tokens++;
80
81      tgsi_parse_token( &parse );
82
83      switch( parse.FullToken.Token.Type ) {
84      case TGSI_TOKEN_TYPE_INSTRUCTION:
85         {
86            const struct tgsi_full_instruction *fullinst
87               = &parse.FullToken.FullInstruction;
88            uint i;
89
90            assert(fullinst->Instruction.Opcode < TGSI_OPCODE_LAST);
91            info->opcode_count[fullinst->Instruction.Opcode]++;
92
93            for (i = 0; i < fullinst->Instruction.NumSrcRegs; i++) {
94               const struct tgsi_full_src_register *src =
95                  &fullinst->Src[i];
96               int ind = src->Register.Index;
97
98               /* Mark which inputs are effectively used */
99               if (src->Register.File == TGSI_FILE_INPUT) {
100                  unsigned usage_mask;
101                  usage_mask = tgsi_util_get_inst_usage_mask(fullinst, i);
102                  if (src->Register.Indirect) {
103                     for (ind = 0; ind < info->num_inputs; ++ind) {
104                        info->input_usage_mask[ind] |= usage_mask;
105                     }
106                  } else {
107                     assert(ind >= 0);
108                     assert(ind < PIPE_MAX_SHADER_INPUTS);
109                     info->input_usage_mask[ind] |= usage_mask;
110                  }
111               }
112
113               /* check for indirect register reads */
114               if (src->Register.Indirect) {
115                  info->indirect_files |= (1 << src->Register.File);
116               }
117            }
118
119            /* check for indirect register writes */
120            for (i = 0; i < fullinst->Instruction.NumDstRegs; i++) {
121               const struct tgsi_full_dst_register *dst = &fullinst->Dst[i];
122               if (dst->Register.Indirect) {
123                  info->indirect_files |= (1 << dst->Register.File);
124               }
125            }
126
127            info->num_instructions++;
128         }
129         break;
130
131      case TGSI_TOKEN_TYPE_DECLARATION:
132         {
133            const struct tgsi_full_declaration *fulldecl
134               = &parse.FullToken.FullDeclaration;
135            const uint file = fulldecl->Declaration.File;
136            uint reg;
137            for (reg = fulldecl->Range.First;
138                 reg <= fulldecl->Range.Last;
139                 reg++) {
140
141               /* only first 32 regs will appear in this bitfield */
142               info->file_mask[file] |= (1 << reg);
143               info->file_count[file]++;
144               info->file_max[file] = MAX2(info->file_max[file], (int)reg);
145
146               if (file == TGSI_FILE_INPUT) {
147                  info->input_semantic_name[reg] = (ubyte)fulldecl->Semantic.Name;
148                  info->input_semantic_index[reg] = (ubyte)fulldecl->Semantic.Index;
149                  info->input_interpolate[reg] = (ubyte)fulldecl->Declaration.Interpolate;
150                  info->input_centroid[reg] = (ubyte)fulldecl->Declaration.Centroid;
151                  info->input_cylindrical_wrap[reg] = (ubyte)fulldecl->Declaration.CylindricalWrap;
152                  info->num_inputs++;
153               }
154               else if (file == TGSI_FILE_SYSTEM_VALUE) {
155                  unsigned index = fulldecl->Range.First;
156                  unsigned semName = fulldecl->Semantic.Name;
157
158                  info->system_value_semantic_name[index] = semName;
159                  info->num_system_values = MAX2(info->num_system_values,
160                                                 index + 1);
161
162                  /*
163                  info->system_value_semantic_name[info->num_system_values++] =
164                     fulldecl->Semantic.Name;
165                  */
166
167                  if (fulldecl->Semantic.Name == TGSI_SEMANTIC_INSTANCEID) {
168                     info->uses_instanceid = TRUE;
169                  }
170               }
171               else if (file == TGSI_FILE_OUTPUT) {
172                  info->output_semantic_name[reg] = (ubyte)fulldecl->Semantic.Name;
173                  info->output_semantic_index[reg] = (ubyte)fulldecl->Semantic.Index;
174                  info->num_outputs++;
175
176                  /* extra info for special outputs */
177                  if (procType == TGSI_PROCESSOR_FRAGMENT &&
178                      fulldecl->Semantic.Name == TGSI_SEMANTIC_POSITION)
179                        info->writes_z = TRUE;
180                  if (procType == TGSI_PROCESSOR_FRAGMENT &&
181                      fulldecl->Semantic.Name == TGSI_SEMANTIC_STENCIL)
182                        info->writes_stencil = TRUE;
183                  if (procType == TGSI_PROCESSOR_VERTEX &&
184                      fulldecl->Semantic.Name == TGSI_SEMANTIC_EDGEFLAG) {
185                     info->writes_edgeflag = TRUE;
186                  }
187               }
188
189             }
190         }
191         break;
192
193      case TGSI_TOKEN_TYPE_IMMEDIATE:
194         {
195            uint reg = info->immediate_count++;
196            uint file = TGSI_FILE_IMMEDIATE;
197
198            info->file_mask[file] |= (1 << reg);
199            info->file_count[file]++;
200            info->file_max[file] = MAX2(info->file_max[file], (int)reg);
201         }
202         break;
203      case TGSI_TOKEN_TYPE_PROPERTY:
204      {
205         const struct tgsi_full_property *fullprop
206            = &parse.FullToken.FullProperty;
207
208         info->properties[info->num_properties].name =
209            fullprop->Property.PropertyName;
210         memcpy(info->properties[info->num_properties].data,
211                fullprop->u, 8 * sizeof(unsigned));;
212
213         ++info->num_properties;
214      }
215      break;
216
217      default:
218         assert( 0 );
219      }
220   }
221
222   info->uses_kill = (info->opcode_count[TGSI_OPCODE_KIL] ||
223                      info->opcode_count[TGSI_OPCODE_KILP]);
224
225   tgsi_parse_free (&parse);
226}
227
228
229
230/**
231 * Check if the given shader is a "passthrough" shader consisting of only
232 * MOV instructions of the form:  MOV OUT[n], IN[n]
233 *
234 */
235boolean
236tgsi_is_passthrough_shader(const struct tgsi_token *tokens)
237{
238   struct tgsi_parse_context parse;
239
240   /**
241    ** Setup to begin parsing input shader
242    **/
243   if (tgsi_parse_init(&parse, tokens) != TGSI_PARSE_OK) {
244      debug_printf("tgsi_parse_init() failed in tgsi_is_passthrough_shader()!\n");
245      return FALSE;
246   }
247
248   /**
249    ** Loop over incoming program tokens/instructions
250    */
251   while (!tgsi_parse_end_of_tokens(&parse)) {
252
253      tgsi_parse_token(&parse);
254
255      switch (parse.FullToken.Token.Type) {
256      case TGSI_TOKEN_TYPE_INSTRUCTION:
257         {
258            struct tgsi_full_instruction *fullinst =
259               &parse.FullToken.FullInstruction;
260            const struct tgsi_full_src_register *src =
261               &fullinst->Src[0];
262            const struct tgsi_full_dst_register *dst =
263               &fullinst->Dst[0];
264
265            /* Do a whole bunch of checks for a simple move */
266            if (fullinst->Instruction.Opcode != TGSI_OPCODE_MOV ||
267                (src->Register.File != TGSI_FILE_INPUT &&
268                 src->Register.File != TGSI_FILE_SYSTEM_VALUE) ||
269                dst->Register.File != TGSI_FILE_OUTPUT ||
270                src->Register.Index != dst->Register.Index ||
271
272                src->Register.Negate ||
273                src->Register.Absolute ||
274
275                src->Register.SwizzleX != TGSI_SWIZZLE_X ||
276                src->Register.SwizzleY != TGSI_SWIZZLE_Y ||
277                src->Register.SwizzleZ != TGSI_SWIZZLE_Z ||
278                src->Register.SwizzleW != TGSI_SWIZZLE_W ||
279
280                dst->Register.WriteMask != TGSI_WRITEMASK_XYZW)
281            {
282               tgsi_parse_free(&parse);
283               return FALSE;
284            }
285         }
286         break;
287
288      case TGSI_TOKEN_TYPE_DECLARATION:
289         /* fall-through */
290      case TGSI_TOKEN_TYPE_IMMEDIATE:
291         /* fall-through */
292      case TGSI_TOKEN_TYPE_PROPERTY:
293         /* fall-through */
294      default:
295         ; /* no-op */
296      }
297   }
298
299   tgsi_parse_free(&parse);
300
301   /* if we get here, it's a pass-through shader */
302   return TRUE;
303}
304