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Vulkan: Workaround for bug in Adreno shader compiler affecting color tests.

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This comparison should pretty much work as well as the old one, I
believe, if not faster.

Should help #10695
This commit is contained in:
Henrik Rydgård 2018-03-19 17:33:08 +01:00
parent 7ce5f8d29c
commit 1888d828ec
1 changed files with 3 additions and 2 deletions
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5
GPU/Vulkan/FragmentShaderGeneratorVulkan.cpp
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@ -268,12 +268,13 @@ bool GenerateVulkanGLSLFragmentShader(const FShaderID &id, char *buffer) {
if (enableColorTest) {
if (colorTestAgainstZero) {
// When testing against 0 (common), we can avoid some math.
// Have my doubts that this special case is actually worth it, but whatever.
// 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) discard;\n");
WRITE(p, " if (v.r + v.g + v.b < 0.002) discard;\n");
} 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) discard;\n");
WRITE(p, " if (v.r + v.g + v.b > 0.002) discard;\n");
} 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.