[Mesa-dev] [PATCH 2/5] nvc0/ir: use levelZero flag when the lod is set to 0

[Ilia Mirkin]

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
index 68f2b15..4181422 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
@@ -662,6 +662,15 @@ NVC0LoweringPass::handleTEX(TexInstruction *i)
       }
    }
 
+   ImmediateValue lod;
+   if (!i->tex.target.isMS() && (i->op == OP_TXL || i->op == OP_TXF) &&
+       i->src(arg).getImmediate(lod) && lod.isInteger(0)) {
+      if (i->op == OP_TXL)
+         i->op = OP_TEX;
+      i->tex.levelZero = true;
+      i->moveSources(arg, -1);
+   }
+
    // Arguments to the TEX instruction are a little insane. Even though the
    // encoding is identical between SM20 and SM30, the arguments mean
    // different things between Fermi and Kepler+. A lot of arguments are
-- 
2.7.3