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Diffstat (limited to 'src/gallium/docs')
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index dd4c7739f3f..d9a7fe9774a 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -23,6 +23,21 @@ When an instruction has a scalar result, the result is usually copied into each of the components of *dst*. When this happens, the result is said to be *replicated* to *dst*. :opcode:`RCP` is one such instruction. +Modifiers +^^^^^^^^^^^^^^^ + +TGSI supports modifiers on inputs (as well as saturate modifier on instructions). + +For inputs which have a floating point type, both absolute value and negation +modifiers are supported (with absolute value being applied first). +TGSI_OPCODE_MOV is considered to have float input type for applying modifiers. + +For inputs which have signed type only the negate modifier is supported. This +includes instructions which are otherwise ignorant if the type is signed or +unsigned, such as TGSI_OPCODE_UADD. + +For inputs with unsigned type no modifiers are allowed. + Instruction Set --------------- |