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authorBrian Paul <brian.paul@tungstengraphics.com>2008-06-04 08:56:06 -0600
committerBrian Paul <brian.paul@tungstengraphics.com>2008-06-04 08:57:15 -0600
commit8223add3304451d5e75737a6d1be1739e4517943 (patch)
tree5e8b462549274f81b7fee5410209c7c6c032ff6f
parent4ebfc3c8ffccadaed98c4e032b7691eaf299b0bc (diff)
gallium: added tgsi_is_passthrough_shader() function
Checks if all instructions are of the form MOV OUT[n], IN[n] Untested at this time.
-rw-r--r--src/gallium/auxiliary/tgsi/util/tgsi_scan.c83
-rw-r--r--src/gallium/auxiliary/tgsi/util/tgsi_scan.h4
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 bda7bc2e2e..240aaaf362 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 0530bc6b51..5cb6efb343 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 */