tgsi_scan.c revision 2253906da3c506bb5378a8f2fa203ed0c9021171
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; 203 204 case TGSI_TOKEN_TYPE_PROPERTY: 205 { 206 const struct tgsi_full_property *fullprop 207 = &parse.FullToken.FullProperty; 208 209 info->properties[info->num_properties].name = 210 fullprop->Property.PropertyName; 211 memcpy(info->properties[info->num_properties].data, 212 fullprop->u, 8 * sizeof(unsigned));; 213 214 ++info->num_properties; 215 } 216 break; 217 218 default: 219 assert( 0 ); 220 } 221 } 222 223 info->uses_kill = (info->opcode_count[TGSI_OPCODE_KIL] || 224 info->opcode_count[TGSI_OPCODE_KILP]); 225 226 /* extract simple properties */ 227 for (i = 0; i < info->num_properties; ++i) { 228 switch (info->properties[i].name) { 229 case TGSI_PROPERTY_FS_COORD_ORIGIN: 230 info->origin_lower_left = info->properties[i].data[0]; 231 break; 232 case TGSI_PROPERTY_FS_COORD_PIXEL_CENTER: 233 info->pixel_center_integer = info->properties[i].data[0]; 234 break; 235 case TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS: 236 info->color0_writes_all_cbufs = info->properties[i].data[0]; 237 break; 238 default: 239 ; 240 } 241 } 242 243 tgsi_parse_free (&parse); 244} 245 246 247 248/** 249 * Check if the given shader is a "passthrough" shader consisting of only 250 * MOV instructions of the form: MOV OUT[n], IN[n] 251 * 252 */ 253boolean 254tgsi_is_passthrough_shader(const struct tgsi_token *tokens) 255{ 256 struct tgsi_parse_context parse; 257 258 /** 259 ** Setup to begin parsing input shader 260 **/ 261 if (tgsi_parse_init(&parse, tokens) != TGSI_PARSE_OK) { 262 debug_printf("tgsi_parse_init() failed in tgsi_is_passthrough_shader()!\n"); 263 return FALSE; 264 } 265 266 /** 267 ** Loop over incoming program tokens/instructions 268 */ 269 while (!tgsi_parse_end_of_tokens(&parse)) { 270 271 tgsi_parse_token(&parse); 272 273 switch (parse.FullToken.Token.Type) { 274 case TGSI_TOKEN_TYPE_INSTRUCTION: 275 { 276 struct tgsi_full_instruction *fullinst = 277 &parse.FullToken.FullInstruction; 278 const struct tgsi_full_src_register *src = 279 &fullinst->Src[0]; 280 const struct tgsi_full_dst_register *dst = 281 &fullinst->Dst[0]; 282 283 /* Do a whole bunch of checks for a simple move */ 284 if (fullinst->Instruction.Opcode != TGSI_OPCODE_MOV || 285 (src->Register.File != TGSI_FILE_INPUT && 286 src->Register.File != TGSI_FILE_SYSTEM_VALUE) || 287 dst->Register.File != TGSI_FILE_OUTPUT || 288 src->Register.Index != dst->Register.Index || 289 290 src->Register.Negate || 291 src->Register.Absolute || 292 293 src->Register.SwizzleX != TGSI_SWIZZLE_X || 294 src->Register.SwizzleY != TGSI_SWIZZLE_Y || 295 src->Register.SwizzleZ != TGSI_SWIZZLE_Z || 296 src->Register.SwizzleW != TGSI_SWIZZLE_W || 297 298 dst->Register.WriteMask != TGSI_WRITEMASK_XYZW) 299 { 300 tgsi_parse_free(&parse); 301 return FALSE; 302 } 303 } 304 break; 305 306 case TGSI_TOKEN_TYPE_DECLARATION: 307 /* fall-through */ 308 case TGSI_TOKEN_TYPE_IMMEDIATE: 309 /* fall-through */ 310 case TGSI_TOKEN_TYPE_PROPERTY: 311 /* fall-through */ 312 default: 313 ; /* no-op */ 314 } 315 } 316 317 tgsi_parse_free(&parse); 318 319 /* if we get here, it's a pass-through shader */ 320 return TRUE; 321} 322