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nv50/ir: saturate depth writes

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Apparently there's no post-FS clamping logic, so we have to do this by
hand. The depth will never be outside of the 0..1 range, even on
floating point zeta buffers, so this should be safe.

Fixes dEQP-GLES3.functional.fbo.depth.*clamp.* which tests writing
invalid values on various zeta buffer formats.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Ilia Mirkin 2016-03-20 13:11:01 -04:00
parent 6262d6125a
commit 6711f159d9
1 changed files with 4 additions and 1 deletions
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5
src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
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@ -3536,8 +3536,11 @@ Converter::exportOutputs()
Symbol *sym = mkSymbol(FILE_SHADER_OUTPUT, 0, TYPE_F32,
info->out[i].slot[c] * 4);
Value *val = oData.load(sub.cur->values, i, c, NULL);
if (val)
if (val) {
if (info->out[i].sn == TGSI_SEMANTIC_POSITION)
mkOp1(OP_SAT, TYPE_F32, val, val);
mkStore(OP_EXPORT, TYPE_F32, sym, NULL, val);
}
}
}
}