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gallium: new CAP, state for primitive restart

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Brian Paul
2010-10-21 19:03:38 -06:00
parent be45255ab1
commit adf35e80d3
3 changed files with 16 additions and 0 deletions
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9
src/gallium/docs/source/context.rst
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@@ -156,6 +156,15 @@ If there is an index buffer bound, and ``indexed`` field is true, all vertex
indices will be looked up in the index buffer. ``min_index``, ``max_index``,
and ``index_bias`` apply after index lookup.
When drawing indexed primitives, the primitive restart index can be
used to draw disjoint primitive strips. For example, several separate
line strips can be drawn by designating a special index value as the
restart index. The ``primitive_restart`` flag enables/disables this
feature. The ``restart_index`` field specifies the restart index value.
When primitive restart is in use, array indexes are compared to the
restart index before adding the index_bias offset.
If a given vertex element has ``instance_divisor`` set to 0, it is said
it contains per-vertex data and effective vertex attribute address needs
to be recalculated for every index.