virtual void emitCode(GrGLFPBuilder* builder,
const GrFragmentProcessor&,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray& coords,
const TextureSamplerArray& samplers) override {
// Using highp for GLES here in order to avoid some precision issues on specific GPUs.
GrGLShaderVar tmpVar("tmpColor", kVec4f_GrSLType, 0, kHigh_GrSLPrecision);
SkString tmpDecl;
tmpVar.appendDecl(builder->ctxInfo(), &tmpDecl);
GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
fsBuilder->codeAppendf("%s;", tmpDecl.c_str());
fsBuilder->codeAppendf("%s = ", tmpVar.c_str());
fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].getType());
fsBuilder->codeAppend(";");
if (GrConfigConversionEffect::kNone_PMConversion == fPMConversion) {
SkASSERT(fSwapRedAndBlue);
fsBuilder->codeAppendf("%s = %s.bgra;", outputColor, tmpVar.c_str());
} else {
const char* swiz = fSwapRedAndBlue ? "bgr" : "rgb";
switch (fPMConversion) {
case GrConfigConversionEffect::kMulByAlpha_RoundUp_PMConversion:
fsBuilder->codeAppendf(
"%s = vec4(ceil(%s.%s * %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), swiz, tmpVar.c_str(), tmpVar.c_str());
break;
case GrConfigConversionEffect::kMulByAlpha_RoundDown_PMConversion:
// Add a compensation(0.001) here to avoid the side effect of the floor operation.
// In Intel GPUs, the integer value converted from floor(%s.r * 255.0) / 255.0
// is less than the integer value converted from %s.r by 1 when the %s.r is
// converted from the integer value 2^n, such as 1, 2, 4, 8, etc.
fsBuilder->codeAppendf(
"%s = vec4(floor(%s.%s * %s.a * 255.0 + 0.001) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), swiz, tmpVar.c_str(), tmpVar.c_str());
break;
case GrConfigConversionEffect::kDivByAlpha_RoundUp_PMConversion:
fsBuilder->codeAppendf(
"%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(ceil(%s.%s / %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), swiz, tmpVar.c_str(), tmpVar.c_str());
break;
case GrConfigConversionEffect::kDivByAlpha_RoundDown_PMConversion:
fsBuilder->codeAppendf(
"%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(floor(%s.%s / %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), swiz, tmpVar.c_str(), tmpVar.c_str());
break;
default:
SkFAIL("Unknown conversion op.");
break;
}
fsBuilder->codeAppendf("%s = %s;", outputColor, tmpVar.c_str());
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, outputColor, inputColor);
fsBuilder->codeAppend(modulate.c_str());
}
void emitCode(EmitArgs& args) override {
const GrConfigConversionEffect& cce = args.fFp.cast<GrConfigConversionEffect>();
const GrSwizzle& swizzle = cce.swizzle();
GrConfigConversionEffect::PMConversion pmConversion = cce.pmConversion();
// Using highp for GLES here in order to avoid some precision issues on specific GPUs.
GrGLSLShaderVar tmpVar("tmpColor", kVec4f_GrSLType, 0, kHigh_GrSLPrecision);
SkString tmpDecl;
tmpVar.appendDecl(args.fGLSLCaps, &tmpDecl);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("%s;", tmpDecl.c_str());
fragBuilder->codeAppendf("%s = ", tmpVar.c_str());
fragBuilder->appendTextureLookup(args.fTexSamplers[0], args.fCoords[0].c_str(),
args.fCoords[0].getType());
fragBuilder->codeAppend(";");
if (GrConfigConversionEffect::kNone_PMConversion == pmConversion) {
SkASSERT(GrSwizzle::RGBA() != swizzle);
fragBuilder->codeAppendf("%s = %s.%s;", args.fOutputColor, tmpVar.c_str(),
swizzle.c_str());
} else {
switch (pmConversion) {
case GrConfigConversionEffect::kMulByAlpha_RoundUp_PMConversion:
fragBuilder->codeAppendf(
"%s = vec4(ceil(%s.rgb * %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str());
break;
case GrConfigConversionEffect::kMulByAlpha_RoundDown_PMConversion:
// Add a compensation(0.001) here to avoid the side effect of the floor operation.
// In Intel GPUs, the integer value converted from floor(%s.r * 255.0) / 255.0
// is less than the integer value converted from %s.r by 1 when the %s.r is
// converted from the integer value 2^n, such as 1, 2, 4, 8, etc.
fragBuilder->codeAppendf(
"%s = vec4(floor(%s.rgb * %s.a * 255.0 + 0.001) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str());
break;
case GrConfigConversionEffect::kDivByAlpha_RoundUp_PMConversion:
fragBuilder->codeAppendf(
"%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(ceil(%s.rgb / %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(),
tmpVar.c_str());
break;
case GrConfigConversionEffect::kDivByAlpha_RoundDown_PMConversion:
fragBuilder->codeAppendf(
"%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(floor(%s.rgb / %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(),
tmpVar.c_str());
break;
default:
SkFAIL("Unknown conversion op.");
break;
}
fragBuilder->codeAppendf("%s = %s.%s;", args.fOutputColor, tmpVar.c_str(),
swizzle.c_str());
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
fragBuilder->codeAppend(modulate.c_str());
}
