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Diffstat (limited to 'src/gallium/docs/source/tgsi.rst')
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index f3aebb3b317..3f48b511ee6 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -2435,6 +2435,29 @@ float32 signed distance to a plane. Primitives will be completely discarded if the plane distance for all of the vertices in the primitive are < 0. If a vertex has a cull distance of NaN, that vertex counts as "out" (as if its < 0); +The limits on both clip and cull distances are bound +by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_COUNT define which defines +the maximum number of components that can be used to hold the +distances and by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT +which specifies the maximum number of registers which can be +annotated with those semantics. + + +TGSI_SEMANTIC_CLIPDIST +"""""""""""""""""""""" + +When components of vertex elements are identified this way, these +values are each assumed to be a float32 signed distance to a plane. +Primitive setup only invokes rasterization on pixels for which +the interpolated plane distances are >= 0. Multiple clip planes +can be implemented simultaneously, by annotating multiple +components of one or more vertex elements with the above specified +semantic. The limits on both clip and cull distances are bound +by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_COUNT define which defines +the maximum number of components that can be used to hold the +distances and by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT +which specifies the maximum number of registers which can be +annotated with those semantics. Declaration Interpolate |