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gallium/draw: add limits to the clip and cull distances

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There are strict limits on those registers. Define the maximums
and use them instead of magic numbers. Also allows us to add
some extra sanity checks.
Suggested by Brian.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
Zack Rusin
2013-06-10 23:36:59 -04:00
parent b63eeaf7b7
commit 5507c11f85
7 changed files with 41 additions and 14 deletions
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23
src/gallium/docs/source/tgsi.rst
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@@ -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