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softgpu: Force alpha test off in more scenarios.

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Since we're already checking the CLUT, we can tell if it doesn't contain
zero alpha, in which case a != 0 test will never fail.  This is actually
pretty common, even when texture alpha is not always FF.
This commit is contained in:
Unknown W. Brackets 2022-12-04 16:30:12 -08:00
parent 5de3a7c252
commit 2c90dafe64
2 changed files with 21 additions and 5 deletions
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25
GPU/Software/Rasterizer.cpp
View file

@ -224,24 +224,34 @@ static bool CheckClutAlphaFull(RasterizerState *state) {
if (samplerID.hasClutMask)
count = std::min(count, ((samplerID.cached.clutFormat >> 8) & 0xFF) + 1);
u32 alphaSum = 0xFFFFFFFF;
if (samplerID.ClutFmt() == GE_CMODE_32BIT_ABGR8888) {
CheckMask32((const uint32_t *)samplerID.cached.clut, count, &alphaSum);
} else {
CheckMask16((const uint16_t *)samplerID.cached.clut, count, &alphaSum);
}
bool onlyFull = true;
switch (samplerID.ClutFmt()) {
case GE_CMODE_16BIT_BGR5650:
break;
case GE_CMODE_16BIT_ABGR5551:
onlyFull = CheckAlpha16((const uint16_t *)samplerID.cached.clut, count, 0x8000) == CHECKALPHA_FULL;
onlyFull = (alphaSum & 0x8000) != 0;
break;
case GE_CMODE_16BIT_ABGR4444:
onlyFull = CheckAlpha16((const uint16_t *)samplerID.cached.clut, count, 0xF000) == CHECKALPHA_FULL;
onlyFull = (alphaSum & 0xF000) == 0xF000;
break;
case GE_CMODE_32BIT_ABGR8888:
onlyFull = CheckAlpha32((const uint32_t *)samplerID.cached.clut, count, 0xFF000000) == CHECKALPHA_FULL;
onlyFull = (alphaSum & 0xFF000000) == 0xFF000000;
break;
}
// Might just be different patterns, but if alphaSum != 0, it can't contain zero.
if (alphaSum != 0)
state->flags |= RasterizerStateFlags::CLUT_ALPHA_NON_ZERO;
if (!onlyFull)
state->flags |= RasterizerStateFlags::CLUT_ALPHA_NON_FULL;
state->flags |= RasterizerStateFlags::CLUT_ALPHA_CHECKED;
@ -321,8 +331,13 @@ static RasterizerStateFlags DetectStateOptimizations(RasterizerState *state) {
alphaTestFunc = GE_COMP_GREATER;
bool alphaTest = (alphaTestFunc == GE_COMP_NOTEQUAL || alphaTestFunc == GE_COMP_GREATER) && pixelID.alphaTestRef < 0xFF && !state->pixelID.hasAlphaTestMask;
if (alphaTest && CheckClutAlphaFull(state))
optimize |= alphaTestFunc == GE_COMP_NOTEQUAL ? RasterizerStateFlags::OPTIMIZED_ALPHATEST_OFF_NE : RasterizerStateFlags::OPTIMIZED_ALPHATEST_OFF_GT;
if (alphaTest) {
bool canSkipAlphaTest = CheckClutAlphaFull(state);
if ((state->flags & RasterizerStateFlags::CLUT_ALPHA_NON_ZERO) && pixelID.alphaTestRef == 0)
canSkipAlphaTest = true;
if (canSkipAlphaTest)
optimize |= alphaTestFunc == GE_COMP_NOTEQUAL ? RasterizerStateFlags::OPTIMIZED_ALPHATEST_OFF_NE : RasterizerStateFlags::OPTIMIZED_ALPHATEST_OFF_GT;
}
}
}

1
GPU/Software/Rasterizer.h
View file

@ -42,6 +42,7 @@ enum class RasterizerStateFlags {
CLUT_ALPHA_CHECKED = 0x0010,
CLUT_ALPHA_NON_FULL = 0x0020,
CLUT_ALPHA_NON_ZERO = 0x0040,
VERTEX_FLAT_RESET = VERTEX_NON_FULL_WHITE | VERTEX_ALPHA_NON_FULL | VERTEX_ALPHA_NON_ZERO | VERTEX_HAS_FOG,