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docs: clean up TGSI_SEMANTIC_PSIZE description

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there was some confusion between point size state and point size output.
This commit is contained in:
Roland Scheidegger 2010-02-03 18:27:32 +01:00
parent c2b85e335d
commit 8091e73cc2
1 changed files with 2 additions and 4 deletions
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6
src/gallium/docs/source/tgsi.rst
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@ -1231,10 +1231,8 @@ TGSI_SEMANTIC_PSIZE
"""""""""""""""""""
PSIZE, or point size, is used to specify point sizes per-vertex. It should
be in ``(p, n, x, f)`` format, where ``p`` is the point size, ``n`` is the minimum
size, ``x`` is the maximum size, and ``f`` is the fade threshold.
XXX this is arb_vp. is this what we actually do? should double-check...
be in ``(s, 0, 0, 1)`` format, where ``s`` is the (possibly clamped) point size.
Only the first component matters when writing from the vertex shader.
When using this semantic, be sure to set the appropriate state in the
:ref:`rasterizer` first.