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gallium: fixup definitions of the rsq and sqrt

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GLSL spec says that rsq is undefined for src<=0, but the D3D10
spec says it needs to be a NaN, so lets stop taking an absolute
value of the source which completely breaks that behavior. For
the gl program we can simply insert an extra abs instrunction
which produces the desired behavior there.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Zack Rusin
2013-07-11 12:16:06 -04:00
parent a171812d27
commit 00cd455bd5
4 changed files with 15 additions and 18 deletions
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6
src/gallium/docs/source/tgsi.rst
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@@ -94,16 +94,16 @@ This instruction replicates its result.
.. opcode:: RSQ - Reciprocal Square Root
This instruction replicates its result.
This instruction replicates its result. The results are undefined for src <= 0.
.. math::
dst = \frac{1}{\sqrt{|src.x|}}
dst = \frac{1}{\sqrt{src.x}}
.. opcode:: SQRT - Square Root
This instruction replicates its result.
This instruction replicates its result. The results are undefined for src < 0.
.. math::