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 <imir...@alum.mit.edu>
Cc: <mesa-sta...@lists.freedesktop.org>
---
src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
index ed06def..e283424 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
@@ -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())
--
1.8.5.5
_______________________________________________
Nouveau mailing list
Nouveau@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/nouveau
