void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>();
GrGLGPBuilder* pb = args.fPB;
GrGLVertexBuilder* vsBuilder = pb->getVertexShaderBuilder();
GrGLFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
// emit attributes
vsBuilder->emitAttributes(gp);
// Setup pass through color
if (!gp.colorIgnored()) {
if (gp.hasVertexColor()) {
pb->addPassThroughAttribute(gp.inColor(), args.fOutputColor);
} else {
this->setupUniformColor(pb, args.fOutputColor, &fColorUniform);
}
}
// Setup position
this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix(),
&fViewMatrixUniform);
if (gp.hasExplicitLocalCoords()) {
// emit transforms with explicit local coords
this->emitTransforms(pb, gpArgs->fPositionVar, gp.inLocalCoords()->fName,
gp.localMatrix(), args.fTransformsIn, args.fTransformsOut);
} else if(gp.hasTransformedLocalCoords()) {
// transforms have already been applied to vertex attributes on the cpu
this->emitTransforms(pb, gp.inLocalCoords()->fName,
args.fTransformsIn, args.fTransformsOut);
} else {
// emit transforms with position
this->emitTransforms(pb, gpArgs->fPositionVar, gp.inPosition()->fName,
gp.localMatrix(), args.fTransformsIn, args.fTransformsOut);
}
// Setup coverage as pass through
if (!gp.coverageWillBeIgnored()) {
if (gp.hasVertexCoverage()) {
fs->codeAppendf("float alpha = 1.0;");
args.fPB->addPassThroughAttribute(gp.inCoverage(), "alpha");
fs->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage);
} else if (gp.coverage() == 0xff) {
fs->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
} else {
const char* fragCoverage;
fCoverageUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType,
kDefault_GrSLPrecision,
"Coverage",
&fragCoverage);
fs->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, fragCoverage);
}
}
}
void GrGLPathProcessor::emitCode(EmitArgs& args) {
GrGLGPBuilder* pb = args.fPB;
GrGLGPFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
const PathBatchTracker& local = args.fBT.cast<PathBatchTracker>();
// emit transforms
this->emitTransforms(args.fPB, args.fTransformsIn, args.fTransformsOut);
// Setup uniform color
if (kUniform_GrGPInput == local.fInputColorType) {
const char* stagedLocalVarName;
fColorUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kVec4f_GrSLType,
kDefault_GrSLPrecision,
"Color",
&stagedLocalVarName);
fs->codeAppendf("%s = %s;", args.fOutputColor, stagedLocalVarName);
}
// setup constant solid coverage
if (kAllOnes_GrGPInput == local.fInputCoverageType) {
fs->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
}
}
void GrGLConicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
GrGLGPBuilder* pb = args.fPB;
GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
const GrConicEffect& gp = args.fGP.cast<GrConicEffect>();
const ConicBatchTracker& local = args.fBT.cast<ConicBatchTracker>();
// emit attributes
vsBuilder->emitAttributes(gp);
GrGLVertToFrag v(kVec4f_GrSLType);
args.fPB->addVarying("ConicCoeffs", &v);
vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inConicCoeffs()->fName);
// Setup pass through color
this->setupColorPassThrough(args.fPB, local.fInputColorType, args.fOutputColor, NULL,
&fColorUniform);
// Setup position
this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix());
// emit transforms with position
this->emitTransforms(pb, gpArgs->fPositionVar, gp.inPosition()->fName, gp.localMatrix(),
args.fTransformsIn, args.fTransformsOut);
GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
fsBuilder->codeAppend("float edgeAlpha;");
switch (fEdgeType) {
case kHairlineAA_GrProcessorEdgeType: {
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
fsBuilder->codeAppendf("vec3 dklmdx = dFdx(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("vec3 dklmdy = dFdy(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("float dfdx ="
"2.0 * %s.x * dklmdx.x - %s.y * dklmdx.z - %s.z * dklmdx.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("float dfdy ="
"2.0 * %s.x * dklmdy.x - %s.y * dklmdy.z - %s.z * dklmdy.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppend("vec2 gF = vec2(dfdx, dfdy);");
fsBuilder->codeAppend("float gFM = sqrt(dot(gF, gF));");
fsBuilder->codeAppendf("float func = %s.x*%s.x - %s.y*%s.z;", v.fsIn(), v.fsIn(),
v.fsIn(), v.fsIn());
fsBuilder->codeAppend("func = abs(func);");
fsBuilder->codeAppend("edgeAlpha = func / gFM;");
fsBuilder->codeAppend("edgeAlpha = max(1.0 - edgeAlpha, 0.0);");
// Add line below for smooth cubic ramp
// fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
break;
}
case kFillAA_GrProcessorEdgeType: {
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
fsBuilder->codeAppendf("vec3 dklmdx = dFdx(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("vec3 dklmdy = dFdy(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("float dfdx ="
"2.0 * %s.x * dklmdx.x - %s.y * dklmdx.z - %s.z * dklmdx.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("float dfdy ="
"2.0 * %s.x * dklmdy.x - %s.y * dklmdy.z - %s.z * dklmdy.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppend("vec2 gF = vec2(dfdx, dfdy);");
fsBuilder->codeAppend("float gFM = sqrt(dot(gF, gF));");
fsBuilder->codeAppendf("float func = %s.x * %s.x - %s.y * %s.z;", v.fsIn(), v.fsIn(),
v.fsIn(), v.fsIn());
fsBuilder->codeAppend("edgeAlpha = func / gFM;");
fsBuilder->codeAppend("edgeAlpha = clamp(1.0 - edgeAlpha, 0.0, 1.0);");
// Add line below for smooth cubic ramp
// fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
break;
}
case kFillBW_GrProcessorEdgeType: {
fsBuilder->codeAppendf("edgeAlpha = %s.x * %s.x - %s.y * %s.z;", v.fsIn(), v.fsIn(),
v.fsIn(), v.fsIn());
fsBuilder->codeAppend("edgeAlpha = float(edgeAlpha < 0.0);");
break;
}
default:
SkFAIL("Shouldn't get here");
}
if (0xff != local.fCoverageScale) {
const char* coverageScale;
fCoverageScaleUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType,
kDefault_GrSLPrecision,
"Coverage",
&coverageScale);
fsBuilder->codeAppendf("%s = vec4(%s * edgeAlpha);", args.fOutputCoverage, coverageScale);
} else {
fsBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
}
}