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docs: Document TGSI Declaration token.

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Michal Krol 2010-02-03 15:45:32 +01:00
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src/gallium/docs/source/tgsi.rst
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@ -1280,6 +1280,34 @@ Other tokens
---------------
Declaration
^^^^^^^^^^^
Declares a register that is will be referenced as an operand in Instruction
tokens.
File field contains register file that is being declared and is one
of TGSI_FILE.
UsageMask field specifies which of the register components can be accessed
and is one of TGSI_WRITEMASK.
Interpolate field is only valid for fragment shader INPUT register files.
It specifes the way input is being interpolated by the rasteriser and is one
of TGSI_INTERPOLATE.
If Dimension flag is set to 1, a Declaration Dimension token follows.
If Semantic flag is set to 1, a Declaration Semantic token follows.
CylindricalWrap bitfield is only valid for fragment shader INPUT register
files. It specifies which register components should be subject to cylindrical
wrapping when interpolating by the rasteriser. If TGSI_CYLINDRICAL_WRAP_X
is set to 1, the X component should be interpolated according to cylindrical
wrapping rules.
Declaration Semantic
^^^^^^^^^^^^^^^^^^^^^^^^