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Don't double src alpha when it's not safe to do so.

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Fixes LittleBigPlanet vignette.
This commit is contained in:
Unknown W. Brackets 2013-05-03 01:10:59 -07:00
parent df65bb40ac
commit 9537be9ebb
1 changed files with 27 additions and 3 deletions
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30
GPU/GLES/FragmentShaderGenerator.cpp
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@ -72,6 +72,29 @@ static bool IsColorTestTriviallyTrue() {
}
}
static bool CanDoubleSrcBlendMode() {
int funcA = gstate.getBlendFuncA();
int funcB = gstate.getBlendFuncB();
if (funcA != GE_SRCBLEND_DOUBLESRCALPHA) {
funcB = funcA;
funcA = gstate.getBlendFuncB();
}
if (funcA != GE_SRCBLEND_DOUBLESRCALPHA) {
return false;
}
// One side should be doubled. Let's check the other side.
// LittleBigPlanet, for example, uses 2.0 * src, 1.0 - src, which can't double.
switch (funcB) {
case GE_DSTBLEND_SRCALPHA:
case GE_DSTBLEND_INVSRCALPHA:
return false;
default:
return true;
}
}
// Here we must take all the bits of the gstate that determine what the fragment shader will
// look like, and concatenate them together into an ID.
@ -86,7 +109,8 @@ void ComputeFragmentShaderID(FragmentShaderID *id) {
bool enableAlphaTest = gstate.isAlphaTestEnabled() && !IsAlphaTestTriviallyTrue();
bool enableColorTest = gstate.isColorTestEnabled() && !IsColorTestTriviallyTrue();
bool enableColorDoubling = (gstate.texfunc & 0x10000) != 0;
bool enableAlphaDoubling = gstate.getBlendFuncA() == GE_SRCBLEND_DOUBLESRCALPHA || gstate.getBlendFuncB() == GE_DSTBLEND_DOUBLESRCALPHA;
// This isn't really correct, but it's a hack to get doubled blend modes to work more correctly.
bool enableAlphaDoubling = CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == 1;
// id->d[0] |= (gstate.clearmode & 1);
@ -127,8 +151,8 @@ void GenerateFragmentShader(char *buffer) {
bool enableAlphaTest = gstate.isAlphaTestEnabled() && !IsAlphaTestTriviallyTrue() && !gstate.isModeClear();
bool enableColorTest = gstate.isColorTestEnabled() && !IsColorTestTriviallyTrue() && !gstate.isModeClear();
bool enableColorDoubling = (gstate.texfunc & 0x10000) != 0;
// TODO: This only does one of the four possible modes.
bool enableAlphaDoubling = gstate.getBlendFuncA() == GE_SRCBLEND_DOUBLESRCALPHA || gstate.getBlendFuncB() == GE_DSTBLEND_DOUBLESRCALPHA;
// This isn't really correct, but it's a hack to get doubled blend modes to work more correctly.
bool enableAlphaDoubling = CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == 1;
if (doTexture)