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Implement in-shader ABSDIFF blending mode #5859

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merged 3 commits into from Apr 13, 2014
Merged

Implement in-shader ABSDIFF blending mode #5859

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e358a6d
Handle ABSDIFF blending mode using GL_EXT_shader_framebuffer_fetch
Apr 13, 2014
f1254c7
Turn off regular alpha blending
Apr 13, 2014
a9d7be1
Should be id0
Apr 13, 2014
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12 changes: 12 additions & 0 deletions GPU/GLES/FragmentShaderGenerator.cpp
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Expand Up @@ -292,6 +292,7 @@ void ComputeFragmentShaderID(FragmentShaderID *id) {
bool enableAlphaDoubling = !alphaToColorDoubling && CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == GE_TEXMAP_TEXTURE_MATRIX;
bool doTextureAlpha = gstate.isTextureAlphaUsed();
bool computeAbsdiff = gstate.getBlendEq() == GE_BLENDMODE_ABSDIFF;
ReplaceAlphaType stencilToAlpha = ReplaceAlphaWithStencil();

// All texfuncs except replace are the same for RGB as for RGBA with full alpha.
Expand Down Expand Up @@ -326,11 +327,16 @@ void ComputeFragmentShaderID(FragmentShaderID *id) {
// 3 bits
id0 |= ReplaceAlphaWithStencilType() << 21;
}

id0 |= (alphaTestAgainstZero & 1) << 24;
if (enableAlphaTest)
gpuStats.numAlphaTestedDraws++;
else
gpuStats.numNonAlphaTestedDraws++;

if (computeAbsdiff) {
id0 |= (computeAbsdiff & 1) << 25;
}
}

id->d[0] = id0;
Expand Down Expand Up @@ -407,6 +413,7 @@ void GenerateFragmentShader(char *buffer) {
bool enableAlphaDoubling = !alphaToColorDoubling && CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == GE_TEXMAP_TEXTURE_MATRIX;
bool doTextureAlpha = gstate.isTextureAlphaUsed();
bool computeAbsdiff = gstate.getBlendEq() == GE_BLENDMODE_ABSDIFF;
ReplaceAlphaType stencilToAlpha = ReplaceAlphaWithStencil();

if (gstate_c.textureFullAlpha && gstate.getTextureFunction() != GE_TEXFUNC_REPLACE)
Expand Down Expand Up @@ -592,6 +599,11 @@ void GenerateFragmentShader(char *buffer) {
}
}

// Handle ABSDIFF blending mode using GL_EXT_shader_framebuffer_fetch
if (computeAbsdiff && gl_extensions.EXT_shader_framebuffer_fetch) {
WRITE(p, " gl_FragColor.rgb = abs(v.rgb - gl_LastFragData[0].rgb);\n");
}

switch (stencilToAlpha) {
case REPLACE_ALPHA_DUALSOURCE:
WRITE(p, " fragColor0 = vec4(v.rgb, 0.0);\n");
Expand Down
7 changes: 6 additions & 1 deletion GPU/GLES/StateMapping.cpp
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Expand Up @@ -325,7 +325,12 @@ void TransformDrawEngine::ApplyDrawState(int prim) {
}

if (((blendFuncEq >= GE_BLENDMODE_MIN) && gl_extensions.EXT_blend_minmax) || gl_extensions.GLES3) {
glstate.blendEquation.set(eqLookup[blendFuncEq]);
if (blendFuncEq == GE_BLENDMODE_ABSDIFF && gl_extensions.EXT_shader_framebuffer_fetch) {
// Handle GE_BLENDMODE_ABSDIFF in fragment shader and turn off regular alpha blending here.
glstate.blend.set(false);
} else {
glstate.blendEquation.set(eqLookup[blendFuncEq]);
}
} else {
glstate.blendEquation.set(eqLookupNoMinMax[blendFuncEq]);
}
Expand Down