tgsi: Document Declaration Semantic token and FACE semantic name.
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@ -1129,3 +1129,35 @@ TGSI Instruction Specification
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target Label of target instruction.
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3 Other tokens
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===============
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3.1 Declaration Semantic
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-------------------------
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Follows Declaration token if Semantic bit is set.
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Since its purpose is to link a shader with other stages of the pipeline,
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it is valid to follow only those Declaration tokens that declare a register
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either in INPUT or OUTPUT file.
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SemanticName field contains the semantic name of the register being declared.
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There is no default value.
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SemanticIndex is an optional subscript that can be used to distinguish
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different register declarations with the same semantic name. The default value
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is 0.
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The meanings of the individual semantic names are explained in the following
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sections.
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3.1.1 FACE
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Valid only in a fragment shader INPUT declaration.
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FACE.x is negative when the primitive is back facing. FACE.x is positive
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when the primitive is front facing.
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