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gl_shader_decompiler: Properly emulate NaN behaviour on NE

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"Not equal" operators on GLSL seem to behave as unordered when we expect
an ordered comparison.

Manually emulate this checking for LGE values (numbers, not-NaNs).
This commit is contained in:
ReinUsesLisp 2020-05-09 04:56:50 -03:00
parent 4e57f9d5cf
commit 8b329ddcc9
1 changed files with 9 additions and 0 deletions
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9
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -1845,6 +1845,15 @@ private:
static_assert(!unordered || type == Type::Float);
const Expression expr = GenerateBinaryInfix(operation, op, Type::Bool, type, type);
if constexpr (op.compare("!=") == 0 && type == Type::Float && !unordered) {
// GLSL's operator!=(float, float) doesn't seem be ordered. This happens on both AMD's
// and Nvidia's proprietary stacks. Manually force an ordered comparison.
return {fmt::format("({} && !isnan({}) && !isnan({}))", expr.AsBool(),
VisitOperand(operation, 0).AsFloat(),
VisitOperand(operation, 1).AsFloat()),
Type::Bool};
}
if constexpr (!unordered) {
return expr;
}