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tgsi: Document Declaration Semantic token and FACE semantic name.

This commit is contained in:
Michal Krol 2009-11-24 11:58:01 +01:00
parent bae9ece685
commit 3c46bbee1b
1 changed files with 32 additions and 0 deletions
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src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
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@ -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.