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VK: Re-apply the old Adreno driver bug workaround. Fixes #13910.

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Should likely fix issue #13923 too.
This commit is contained in:
Henrik Rydgård 2021-01-16 12:56:04 +01:00
parent 13e7de1b85
commit 71f9196d61
1 changed files with 14 additions and 3 deletions
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17
GPU/Common/FragmentShaderGenerator.cpp
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@ -778,10 +778,21 @@ bool GenerateFragmentShader(const FShaderID &id, char *buffer, const ShaderLangu
// When testing against 0 (common), we can avoid some math.
// 0.002 is approximately half of 1.0 / 255.0.
if (colorTestFunc == GE_COMP_NOTEQUAL) {
WRITE(p, " if (v.r < 0.002 && v.g < 0.002 && v.b < 0.002) %s\n", discardStatement);
if (compat.shaderLanguage == GLSL_VULKAN) {
// Old workaround for Adreno driver bug. We could make this the main path actually
// since the math is roughly equivalent given the non-negative inputs.
WRITE(p, " if (v.r + v.g + v.b < 0.002) %s\n", discardStatement);
} else {
WRITE(p, " if (v.r < 0.002 && v.g < 0.002 && v.b < 0.002) %s\n", discardStatement);
}
} else if (colorTestFunc != GE_COMP_NEVER) {
// Anything else is a test for == 0.
WRITE(p, " if (v.r > 0.002 || v.g > 0.002 || v.b > 0.002) %s\n", discardStatement);
if (compat.shaderLanguage == GLSL_VULKAN) {
// See the GE_COMP_NOTEQUAL case.
WRITE(p, " if (v.r + v.g + v.b > 0.002) %s\n", discardStatement);
} else {
// Anything else is a test for == 0.
WRITE(p, " if (v.r > 0.002 || v.g > 0.002 || v.b > 0.002) %s\n", discardStatement);
}
} else {
// NEVER has been logged as used by games, although it makes little sense - statically failing.
// Maybe we could discard the drawcall, but it's pretty rare. Let's just statically discard here.