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authorMichal Krol <michal@vmware.com>2009-11-24 11:58:01 +0100
committerMichal Krol <michal@vmware.com>2009-11-24 11:58:01 +0100
commit3c46bbee1bb4f107d68addae472cf7bbc0976653 (patch)
treee791a4a81bfd75c2255386f10679b967cf4e84e4
parentbae9ece685e3c10fc0118e99771845d15895a0cc (diff)
tgsi: Document Declaration Semantic token and FACE semantic name.
-rw-r--r--src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt b/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
index eb492076b7..080fd4c731 100644
--- a/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
+++ b/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
@@ -1129,3 +1129,35 @@ TGSI Instruction Specification
target Label of target instruction.
+
+3 Other tokens
+===============
+
+
+3.1 Declaration Semantic
+-------------------------
+
+
+ Follows Declaration token if Semantic bit is set.
+
+ Since its purpose is to link a shader with other stages of the pipeline,
+ it is valid to follow only those Declaration tokens that declare a register
+ either in INPUT or OUTPUT file.
+
+ SemanticName field contains the semantic name of the register being declared.
+ There is no default value.
+
+ SemanticIndex is an optional subscript that can be used to distinguish
+ different register declarations with the same semantic name. The default value
+ is 0.
+
+ The meanings of the individual semantic names are explained in the following
+ sections.
+
+
+3.1.1 FACE
+
+ Valid only in a fragment shader INPUT declaration.
+
+ FACE.x is negative when the primitive is back facing. FACE.x is positive
+ when the primitive is front facing.