radeonsi also does the same thing. I suspect that this is likely to be a
no-op in reality, but it brings nouveau code closer to what the blob
produces. Plus it makes sense to not try to do auto-derivatives on this.

Signed-off-by: Ilia Mirkin <imir...@alum.mit.edu>
---
 src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp 
b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
index e43c951..0e0eecc 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
@@ -2193,7 +2193,13 @@ Converter::handleTEX(Value *dst[4], int R, int S, int L, 
int C, int Dx, int Dy)
 
    setTexRS(texi, s, R, S);
 
-   if (tgsi.getOpcode() == TGSI_OPCODE_SAMPLE_C_LZ)
+   if (tgsi.getOpcode() == TGSI_OPCODE_SAMPLE_C_LZ ||
+       tgsi.getOpcode() == TGSI_OPCODE_TG4)
+      texi->tex.levelZero = true;
+   if (prog->getType() != Program::TYPE_FRAGMENT &&
+       (tgsi.getOpcode() == TGSI_OPCODE_TEX ||
+        tgsi.getOpcode() == TGSI_OPCODE_TEX2 ||
+        tgsi.getOpcode() == TGSI_OPCODE_TXP))
       texi->tex.levelZero = true;
    if (tgsi.getOpcode() == TGSI_OPCODE_TG4 && !tgt.isShadow())
       texi->tex.gatherComp = tgsi.getSrc(1).getValueU32(0, info);
-- 
2.7.3

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