tgsi_scan.c File Reference

Include dependency graph for tgsi_scan.c:

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Functions
void	tgsi_scan_shader (const struct tgsi_token *tokens, struct tgsi_shader_info *info)
	TGSI program scan utility.
boolean	tgsi_is_passthrough_shader (const struct tgsi_token *tokens)
	Check if the given shader is a "passthrough" shader consisting of only MOV instructions of the form: MOV OUT[n], IN[n].

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Function Documentation

boolean tgsi_is_passthrough_shader

(

const struct tgsi_token *

tokens

)

Check if the given shader is a "passthrough" shader consisting of only MOV instructions of the form: MOV OUT[n], IN[n].

Setup to begin parsing input shader

Loop over incoming program tokens/instructions

Definition at line 174 of file tgsi_scan.c.

References tgsi_src_register_ext_mod::Absolute, tgsi_src_register_ext_mod::Bias, tgsi_src_register_ext_mod::Complement, debug_printf(), tgsi_full_dst_register::DstRegister, tgsi_src_register_ext_swz::ExtSwizzleW, tgsi_src_register_ext_swz::ExtSwizzleX, tgsi_src_register_ext_swz::ExtSwizzleY, tgsi_src_register_ext_swz::ExtSwizzleZ, FALSE, tgsi_dst_register::File, tgsi_src_register::File, tgsi_full_instruction::FullDstRegisters, tgsi_full_token::FullInstruction, tgsi_full_instruction::FullSrcRegisters, tgsi_parse_context::FullToken, tgsi_dst_register::Index, tgsi_src_register::Index, tgsi_full_instruction::Instruction, tgsi_src_register_ext_mod::Negate, tgsi_src_register::Negate, tgsi_instruction::Opcode, tgsi_src_register_ext_mod::Scale2X, tgsi_full_src_register::SrcRegister, tgsi_full_src_register::SrcRegisterExtMod, tgsi_full_src_register::SrcRegisterExtSwz, tgsi_src_register::SwizzleW, tgsi_src_register::SwizzleX, tgsi_src_register::SwizzleY, tgsi_src_register::SwizzleZ, TGSI_EXTSWIZZLE_W, TGSI_EXTSWIZZLE_X, TGSI_EXTSWIZZLE_Y, TGSI_EXTSWIZZLE_Z, TGSI_FILE_INPUT, TGSI_FILE_OUTPUT, TGSI_OPCODE_MOV, tgsi_parse_end_of_tokens(), tgsi_parse_free(), tgsi_parse_init(), TGSI_PARSE_OK, tgsi_parse_token(), TGSI_SWIZZLE_W, TGSI_SWIZZLE_X, TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Z, TGSI_TOKEN_TYPE_DECLARATION, TGSI_TOKEN_TYPE_IMMEDIATE, TGSI_TOKEN_TYPE_INSTRUCTION, TGSI_WRITEMASK_XYZW, tgsi_full_token::Token, TRUE, tgsi_token::Type, and tgsi_dst_register::WriteMask.

{
   struct tgsi_parse_context parse;

   if (tgsi_parse_init(&parse, tokens) != TGSI_PARSE_OK) {
      debug_printf("tgsi_parse_init() failed in tgsi_is_passthrough_shader()!\n");
      return FALSE;
   }

   while (!tgsi_parse_end_of_tokens(&parse)) {

      tgsi_parse_token(&parse);

      switch (parse.FullToken.Token.Type) {
      case TGSI_TOKEN_TYPE_INSTRUCTION:
         {
            struct tgsi_full_instruction *fullinst =
               &parse.FullToken.FullInstruction;
            const struct tgsi_full_src_register *src =
               &fullinst->FullSrcRegisters[0];
            const struct tgsi_full_dst_register *dst =
               &fullinst->FullDstRegisters[0];

            /* Do a whole bunch of checks for a simple move */
            if (fullinst->Instruction.Opcode != TGSI_OPCODE_MOV ||
                src->SrcRegister.File != TGSI_FILE_INPUT ||
                dst->DstRegister.File != TGSI_FILE_OUTPUT ||
                src->SrcRegister.Index != dst->DstRegister.Index ||

                src->SrcRegister.Negate ||
                src->SrcRegisterExtMod.Negate ||
                src->SrcRegisterExtMod.Absolute ||
                src->SrcRegisterExtMod.Scale2X ||
                src->SrcRegisterExtMod.Bias ||
                src->SrcRegisterExtMod.Complement ||

                src->SrcRegister.SwizzleX != TGSI_SWIZZLE_X ||
                src->SrcRegister.SwizzleY != TGSI_SWIZZLE_Y ||
                src->SrcRegister.SwizzleZ != TGSI_SWIZZLE_Z ||
                src->SrcRegister.SwizzleW != TGSI_SWIZZLE_W ||

                src->SrcRegisterExtSwz.ExtSwizzleX != TGSI_EXTSWIZZLE_X ||
                src->SrcRegisterExtSwz.ExtSwizzleY != TGSI_EXTSWIZZLE_Y ||
                src->SrcRegisterExtSwz.ExtSwizzleZ != TGSI_EXTSWIZZLE_Z ||
                src->SrcRegisterExtSwz.ExtSwizzleW != TGSI_EXTSWIZZLE_W ||

                dst->DstRegister.WriteMask != TGSI_WRITEMASK_XYZW)
            {
               tgsi_parse_free(&parse);
               return FALSE;
            }
         }
         break;

      case TGSI_TOKEN_TYPE_DECLARATION:
         /* fall-through */
      case TGSI_TOKEN_TYPE_IMMEDIATE:
         /* fall-through */
      default:
         ; /* no-op */
      }
   }

   tgsi_parse_free(&parse);

   /* if we get here, it's a pass-through shader */
   return TRUE;
}

void tgsi_scan_shader	(	const struct tgsi_token *	tokens,
		struct tgsi_shader_info *	info
	)

TGSI program scan utility.

Used to determine which registers and instructions are used by a shader.

Authors: Brian Paul

Setup to begin parsing input shader

Loop over incoming program tokens/instructions

Definition at line 48 of file tgsi_scan.c.

References assert, debug_printf(), tgsi_full_declaration::Declaration, tgsi_full_declaration::DeclarationRange, tgsi_declaration::File, tgsi_src_register::File, tgsi_shader_info::file_count, tgsi_shader_info::file_mask, tgsi_shader_info::file_max, tgsi_declaration_range::First, tgsi_full_token::FullDeclaration, tgsi_parse_context::FullHeader, tgsi_full_token::FullInstruction, tgsi_full_instruction::FullSrcRegisters, tgsi_parse_context::FullToken, tgsi_shader_info::immediate_count, tgsi_src_register::Index, tgsi_shader_info::input_semantic_index, tgsi_shader_info::input_semantic_name, tgsi_full_instruction::Instruction, tgsi_declaration_range::Last, MAX2, tgsi_shader_info::num_inputs, tgsi_shader_info::num_outputs, tgsi_shader_info::num_tokens, tgsi_instruction::NumSrcRegs, tgsi_instruction::Opcode, tgsi_shader_info::opcode_count, tgsi_shader_info::output_semantic_index, tgsi_shader_info::output_semantic_name, tgsi_processor::Processor, tgsi_full_header::Processor, tgsi_full_declaration::Semantic, tgsi_declaration_semantic::SemanticIndex, tgsi_declaration_semantic::SemanticName, tgsi_full_src_register::SrcRegister, tgsi_src_register::SwizzleX, TGSI_FILE_COUNT, TGSI_FILE_INPUT, TGSI_FILE_OUTPUT, TGSI_OPCODE_KIL, TGSI_OPCODE_KILP, TGSI_OPCODE_LAST, tgsi_parse_end_of_tokens(), tgsi_parse_free(), tgsi_parse_init(), TGSI_PARSE_OK, tgsi_parse_token(), TGSI_PROCESSOR_FRAGMENT, TGSI_PROCESSOR_GEOMETRY, TGSI_PROCESSOR_VERTEX, TGSI_SEMANTIC_FOG, TGSI_SEMANTIC_POSITION, TGSI_SWIZZLE_X, TGSI_SWIZZLE_Y, TGSI_TOKEN_TYPE_DECLARATION, TGSI_TOKEN_TYPE_IMMEDIATE, TGSI_TOKEN_TYPE_INSTRUCTION, tgsi_full_token::Token, TRUE, tgsi_token::Type, tgsi_shader_info::uses_fogcoord, tgsi_shader_info::uses_frontfacing, tgsi_shader_info::uses_kill, and tgsi_shader_info::writes_z.

{
   uint procType, i;
   struct tgsi_parse_context parse;

   memset(info, 0, sizeof(*info));
   for (i = 0; i < TGSI_FILE_COUNT; i++)
      info->file_max[i] = -1;

   if (tgsi_parse_init( &parse, tokens ) != TGSI_PARSE_OK) {
      debug_printf("tgsi_parse_init() failed in tgsi_scan_shader()!\n");
      return;
   }
   procType = parse.FullHeader.Processor.Processor;
   assert(procType == TGSI_PROCESSOR_FRAGMENT ||
          procType == TGSI_PROCESSOR_VERTEX ||
          procType == TGSI_PROCESSOR_GEOMETRY);


   while( !tgsi_parse_end_of_tokens( &parse ) ) {

      info->num_tokens++;

      tgsi_parse_token( &parse );

      switch( parse.FullToken.Token.Type ) {
      case TGSI_TOKEN_TYPE_INSTRUCTION:
         {
            const struct tgsi_full_instruction *fullinst
               = &parse.FullToken.FullInstruction;

            assert(fullinst->Instruction.Opcode < TGSI_OPCODE_LAST);
            info->opcode_count[fullinst->Instruction.Opcode]++;

            /* special case: scan fragment shaders for use of the fog
             * input/attribute.  The X component is fog, the Y component
             * is the front/back-face flag.
             */
            if (procType == TGSI_PROCESSOR_FRAGMENT) {
               uint i;
               for (i = 0; i < fullinst->Instruction.NumSrcRegs; i++) {
                  const struct tgsi_full_src_register *src =
                     &fullinst->FullSrcRegisters[i];
                  if (src->SrcRegister.File == TGSI_FILE_INPUT) {
                     const int ind = src->SrcRegister.Index;
                     if (info->input_semantic_name[ind] == TGSI_SEMANTIC_FOG) {
                        if (src->SrcRegister.SwizzleX == TGSI_SWIZZLE_X) {
                           info->uses_fogcoord = TRUE;
                        }
                        else if (src->SrcRegister.SwizzleX == TGSI_SWIZZLE_Y) {
                           info->uses_frontfacing = TRUE;
                        }
                     }
                  }
               }
            }
         }
         break;

      case TGSI_TOKEN_TYPE_DECLARATION:
         {
            const struct tgsi_full_declaration *fulldecl
               = &parse.FullToken.FullDeclaration;
            uint file = fulldecl->Declaration.File;
            uint reg;
            for (reg = fulldecl->DeclarationRange.First;
                 reg <= fulldecl->DeclarationRange.Last;
                 reg++) {

               /* only first 32 regs will appear in this bitfield */
               info->file_mask[file] |= (1 << reg);
               info->file_count[file]++;
               info->file_max[file] = MAX2(info->file_max[file], (int)reg);

               if (file == TGSI_FILE_INPUT) {
                  info->input_semantic_name[reg] = (ubyte)fulldecl->Semantic.SemanticName;
                  info->input_semantic_index[reg] = (ubyte)fulldecl->Semantic.SemanticIndex;
                  info->num_inputs++;
               }

               if (file == TGSI_FILE_OUTPUT) {
                  info->output_semantic_name[reg] = (ubyte)fulldecl->Semantic.SemanticName;
                  info->output_semantic_index[reg] = (ubyte)fulldecl->Semantic.SemanticIndex;
                  info->num_outputs++;
               }

               /* special case */
               if (procType == TGSI_PROCESSOR_FRAGMENT &&
                   file == TGSI_FILE_OUTPUT &&
                   fulldecl->Semantic.SemanticName == TGSI_SEMANTIC_POSITION) {
                  info->writes_z = TRUE;
               }
            }
         }
         break;

      case TGSI_TOKEN_TYPE_IMMEDIATE:
         info->immediate_count++;
         break;

      default:
         assert( 0 );
      }
   }

   info->uses_kill = (info->opcode_count[TGSI_OPCODE_KIL] ||
                      info->opcode_count[TGSI_OPCODE_KILP]);

   tgsi_parse_free (&parse);
}

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