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Diffstat (limited to 'src/gallium/docs/source/tgsi.rst')
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index 4c55e60cff0..28308cb9483 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -1949,6 +1949,35 @@ When using this semantic, be sure to set the appropriate state in the :ref:`rasterizer` first. +TGSI_SEMANTIC_TEXCOORD +"""""""""""""""""""""" + +Only available if PIPE_CAP_TGSI_TEXCOORD is exposed ! + +Vertex shader outputs and fragment shader inputs may be labeled with +this semantic to make them replaceable by sprite coordinates via the +sprite_coord_enable state in the :ref:`rasterizer`. +The semantic index permitted with this semantic is limited to <= 7. + +If the driver does not support TEXCOORD, sprite coordinate replacement +applies to inputs with the GENERIC semantic instead. + +The intended use case for this semantic is gl_TexCoord. + + +TGSI_SEMANTIC_PCOORD +"""""""""""""""""""" + +Only available if PIPE_CAP_TGSI_TEXCOORD is exposed ! + +Fragment shader inputs may be labeled with TGSI_SEMANTIC_PCOORD to indicate +that the register contains sprite coordinates in the form (x, y, 0, 1), if +the current primitive is a point and point sprites are enabled. Otherwise, +the contents of the register are undefined. + +The intended use case for this semantic is gl_PointCoord. + + TGSI_SEMANTIC_GENERIC """"""""""""""""""""" |