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nv50/ir: ignore bias for samplerCubeShadow on nv50

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Unfortunately there's no good way to do this on the nv50 shader isa.
Dropping the bias seems preferable to doing the compare post-filtering.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Ilia Mirkin 2014-07-04 18:38:28 -04:00
parent 30d91e0eec
commit 1065aa92f4
1 changed files with 10 additions and 0 deletions
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10
src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
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@ -797,6 +797,16 @@ NV50LoweringPreSSA::handleTXB(TexInstruction *i)
const CondCode cc[4] = { CC_EQU, CC_S, CC_C, CC_O };
int l, d;
// We can't actually apply bias *and* do a compare for a cube
// texture. Since the compare has to be done before the filtering, just
// drop the bias on the floor.
if (i->tex.target == TEX_TARGET_CUBE_SHADOW) {
i->op = OP_TEX;
i->setSrc(3, i->getSrc(4));
i->setSrc(4, NULL);
return handleTEX(i);
}
handleTEX(i);
Value *bias = i->getSrc(i->tex.target.getArgCount());
if (bias->isUniform())