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Replace alpha when blend mode allows it.

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Some games are using fixed/fixed blending modes which work in our favor.
This commit is contained in:
Unknown W. Brackets 2013-12-07 02:54:33 -08:00
parent 3a4cbb8991
commit 054501c100
3 changed files with 45 additions and 3 deletions
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42
GPU/GLES/FragmentShaderGenerator.cpp
View file

@ -99,6 +99,44 @@ static bool IsAlphaTestTriviallyTrue() {
}
}
const bool nonAlphaSrcFactors[16] = {
true, // GE_SRCBLEND_DSTCOLOR,
true, // GE_SRCBLEND_INVDSTCOLOR,
false, // GE_SRCBLEND_SRCALPHA,
false, // GE_SRCBLEND_INVSRCALPHA,
true, // GE_SRCBLEND_DSTALPHA,
true, // GE_SRCBLEND_INVDSTALPHA,
false, // GE_SRCBLEND_DOUBLESRCALPHA,
false, // GE_SRCBLEND_DOUBLEINVSRCALPHA,
true, // GE_SRCBLEND_DOUBLEDSTALPHA,
true, // GE_SRCBLEND_DOUBLEINVDSTALPHA,
true, // GE_SRCBLEND_FIXA,
};
const bool nonAlphaDestFactors[16] = {
true, // GE_DSTBLEND_SRCCOLOR,
true, // GE_DSTBLEND_INVSRCCOLOR,
false, // GE_DSTBLEND_SRCALPHA,
false, // GE_DSTBLEND_INVSRCALPHA,
true, // GE_DSTBLEND_DSTALPHA,
true, // GE_DSTBLEND_INVDSTALPHA,
false, // GE_DSTBLEND_DOUBLESRCALPHA,
false, // GE_DSTBLEND_DOUBLEINVSRCALPHA,
true, // GE_DSTBLEND_DOUBLEDSTALPHA,
true, // GE_DSTBLEND_DOUBLEINVDSTALPHA,
true, // GE_DSTBLEND_FIXB,
};
bool CanReplaceAlphaWithStencil() {
if (!gstate.isStencilTestEnabled()) {
return false;
}
if (gstate.isAlphaBlendEnabled()) {
return nonAlphaSrcFactors[gstate.getBlendFuncA()] && nonAlphaDestFactors[gstate.getBlendFuncA()];
}
return true;
}
StencilValueType ReplaceAlphaWithStencilType() {
switch (gstate.FrameBufFormat()) {
case GE_FORMAT_565:
@ -214,7 +252,7 @@ void ComputeFragmentShaderID(FragmentShaderID *id) {
bool enableAlphaDoubling = CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == GE_TEXMAP_TEXTURE_MATRIX;
bool doTextureAlpha = gstate.isTextureAlphaUsed();
bool stencilToAlpha = gstate.isStencilTestEnabled() && !gstate.isAlphaBlendEnabled();
bool stencilToAlpha = CanReplaceAlphaWithStencil();
// All texfuncs except replace are the same for RGB as for RGBA with full alpha.
if (gstate_c.textureFullAlpha && gstate.getTextureFunction() != GE_TEXFUNC_REPLACE)
@ -284,7 +322,7 @@ void GenerateFragmentShader(char *buffer) {
bool enableAlphaDoubling = CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == GE_TEXMAP_TEXTURE_MATRIX;
bool doTextureAlpha = gstate.isTextureAlphaUsed();
bool stencilToAlpha = !gstate.isModeClear() && gstate.isStencilTestEnabled() && !gstate.isAlphaBlendEnabled();
bool stencilToAlpha = !gstate.isModeClear() && CanReplaceAlphaWithStencil();
if (gstate_c.textureFullAlpha && gstate.getTextureFunction() != GE_TEXFUNC_REPLACE)
doTextureAlpha = false;

1
GPU/GLES/FragmentShaderGenerator.h
View file

@ -53,4 +53,5 @@ enum StencilValueType {
};
StencilValueType ReplaceAlphaWithStencilType();
bool CanReplaceAlphaWithStencil();

5
GPU/GLES/StateMapping.cpp
View file

@ -249,7 +249,10 @@ void TransformDrawEngine::ApplyDrawState(int prim) {
// do any blending in the alpha channel as that doesn't seem to happen on PSP. So lacking a better option,
// the only value we can set alpha to here without multipass and dual source alpha is zero (by setting
// the factors to zero). So let's do that.
if (gstate.isStencilTestEnabled()) {
if (CanReplaceAlphaWithStencil()) {
// Let the fragment shader take care of it.
glstate.blendFuncSeparate.set(glBlendFuncA, glBlendFuncB, GL_ONE, GL_ZERO);
} else if (gstate.isStencilTestEnabled()) {
switch (ReplaceAlphaWithStencilType()) {
case STENCIL_VALUE_KEEP:
glstate.blendFuncSeparate.set(glBlendFuncA, glBlendFuncB, GL_ZERO, GL_ONE);