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Shaders: Explicitly conform to PICA semantics in MAX/MIN

master
Yuri Kunde Schlesner 2015-08-24 01:46:58 +07:00
parent 76247170df
commit 082b74fa24
2 changed files with 10 additions and 2 deletions
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10
src/video_core/shader/shader_interpreter.cpp
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@ -177,7 +177,10 @@ void RunInterpreter(UnitState<Debug>& state) {
if (!swizzle.DestComponentEnabled(i))
continue;
dest[i] = std::max(src1[i], src2[i]);
// NOTE: Exact form required to match NaN semantics to hardware:
// max(0, NaN) -> NaN
// max(NaN, 0) -> 0
dest[i] = (src1[i] > src2[i]) ? src1[i] : src2[i];
}
Record<DebugDataRecord::DEST_OUT>(state.debug, iteration, dest);
break;
@ -190,7 +193,10 @@ void RunInterpreter(UnitState<Debug>& state) {
if (!swizzle.DestComponentEnabled(i))
continue;
dest[i] = std::min(src1[i], src2[i]);
// NOTE: Exact form required to match NaN semantics to hardware:
// min(0, NaN) -> NaN
// min(NaN, 0) -> 0
dest[i] = (src1[i] < src2[i]) ? src1[i] : src2[i];
}
Record<DebugDataRecord::DEST_OUT>(state.debug, iteration, dest);
break;

2
src/video_core/shader/shader_jit_x64.cpp
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@ -467,6 +467,7 @@ void JitCompiler::Compile_FLR(Instruction instr) {
void JitCompiler::Compile_MAX(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
// SSE semantics match PICA200 ones: In case of NaN, SRC2 is returned.
MAXPS(SRC1, R(SRC2));
Compile_DestEnable(instr, SRC1);
}
@ -474,6 +475,7 @@ void JitCompiler::Compile_MAX(Instruction instr) {
void JitCompiler::Compile_MIN(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
// SSE semantics match PICA200 ones: In case of NaN, SRC2 is returned.
MINPS(SRC1, R(SRC2));
Compile_DestEnable(instr, SRC1);
}