diff options
| -rw-r--r-- | src/gallium/auxiliary/tgsi/util/tgsi_scan.c | 83 | ||||
| -rw-r--r-- | src/gallium/auxiliary/tgsi/util/tgsi_scan.h | 4 |
2 files changed, 87 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/util/tgsi_scan.c b/src/gallium/auxiliary/tgsi/util/tgsi_scan.c index bda7bc2e2ed..240aaaf362c 100644 --- a/src/gallium/auxiliary/tgsi/util/tgsi_scan.c +++ b/src/gallium/auxiliary/tgsi/util/tgsi_scan.c @@ -141,3 +141,86 @@ tgsi_scan_shader(const struct tgsi_token *tokens, tgsi_parse_free (&parse); } + + + +/** + * Check if the given shader is a "passthrough" shader consisting of only + * MOV instructions of the form: MOV OUT[n], IN[n] + * + */ +boolean +tgsi_is_passthrough_shader(const struct tgsi_token *tokens) +{ + struct tgsi_parse_context parse; + + /** + ** Setup to begin parsing input shader + **/ + if (tgsi_parse_init(&parse, tokens) != TGSI_PARSE_OK) { + debug_printf("tgsi_parse_init() failed in tgsi_is_passthrough_shader()!\n"); + return FALSE; + } + + /** + ** Loop over incoming program tokens/instructions + */ + 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; +} diff --git a/src/gallium/auxiliary/tgsi/util/tgsi_scan.h b/src/gallium/auxiliary/tgsi/util/tgsi_scan.h index 0530bc6b510..5cb6efb3439 100644 --- a/src/gallium/auxiliary/tgsi/util/tgsi_scan.h +++ b/src/gallium/auxiliary/tgsi/util/tgsi_scan.h @@ -67,4 +67,8 @@ tgsi_scan_shader(const struct tgsi_token *tokens, struct tgsi_shader_info *info); +extern boolean +tgsi_is_passthrough_shader(const struct tgsi_token *tokens); + + #endif /* TGSI_SCAN_H */ |