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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrPathProcessor.h"
#include "GrShaderCaps.h"
#include "gl/GrGLGpu.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "glsl/GrGLSLVarying.h"
class GrGLPathProcessor : public GrGLSLPrimitiveProcessor {
public:
GrGLPathProcessor() : fColor(GrColor_ILLEGAL) {}
static void GenKey(const GrPathProcessor& pathProc,
const GrShaderCaps&,
GrProcessorKeyBuilder* b) {
b->add32(SkToInt(pathProc.viewMatrix().hasPerspective()));
}
void emitCode(EmitArgs& args) override {
GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
const GrPathProcessor& pathProc = args.fGP.cast<GrPathProcessor>();
if (!pathProc.viewMatrix().hasPerspective()) {
args.fVaryingHandler->setNoPerspective();
}
// emit transforms
this->emitTransforms(args.fVaryingHandler, args.fFPCoordTransformHandler);
// Setup uniform color
const char* stagedLocalVarName;
fColorUniform = args.fUniformHandler->addUniform(kFragment_GrShaderFlag,
kHalf4_GrSLType,
"Color",
&stagedLocalVarName);
fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, stagedLocalVarName);
// setup constant solid coverage
fragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
}
void emitTransforms(GrGLSLVaryingHandler* varyingHandler,
FPCoordTransformHandler* transformHandler) {
int i = 0;
while (const GrCoordTransform* coordTransform = transformHandler->nextCoordTransform()) {
GrSLType varyingType =
coordTransform->getMatrix().hasPerspective() ? kHalf3_GrSLType
: kHalf2_GrSLType;
SkString strVaryingName;
strVaryingName.printf("TransformedCoord_%d", i);
GrGLSLVarying v(varyingType);
GrGLVaryingHandler* glVaryingHandler = (GrGLVaryingHandler*) varyingHandler;
fInstalledTransforms.push_back().fHandle =
glVaryingHandler->addPathProcessingVarying(strVaryingName.c_str(),
&v).toIndex();
fInstalledTransforms.back().fType = varyingType;
transformHandler->specifyCoordsForCurrCoordTransform(SkString(v.fsIn()), varyingType);
++i;
}
}
void setData(const GrGLSLProgramDataManager& pd,
const GrPrimitiveProcessor& primProc,
FPCoordTransformIter&& transformIter) override {
const GrPathProcessor& pathProc = primProc.cast<GrPathProcessor>();
if (pathProc.color() != fColor) {
float c[4];
GrColorToRGBAFloat(pathProc.color(), c);
pd.set4fv(fColorUniform, 1, c);
fColor = pathProc.color();
}
int t = 0;
while (const GrCoordTransform* coordTransform = transformIter.next()) {
SkASSERT(fInstalledTransforms[t].fHandle.isValid());
const SkMatrix& m = GetTransformMatrix(pathProc.localMatrix(), *coordTransform);
if (fInstalledTransforms[t].fCurrentValue.cheapEqualTo(m)) {
continue;
}
fInstalledTransforms[t].fCurrentValue = m;
SkASSERT(fInstalledTransforms[t].fType == kHalf2_GrSLType ||
fInstalledTransforms[t].fType == kHalf3_GrSLType);
unsigned components = fInstalledTransforms[t].fType == kHalf2_GrSLType ? 2 : 3;
pd.setPathFragmentInputTransform(fInstalledTransforms[t].fHandle, components, m);
++t;
}
}
private:
typedef GrGLSLProgramDataManager::VaryingHandle VaryingHandle;
struct TransformVarying {
VaryingHandle fHandle;
SkMatrix fCurrentValue = SkMatrix::InvalidMatrix();
GrSLType fType = kVoid_GrSLType;
};
SkTArray<TransformVarying, true> fInstalledTransforms;
UniformHandle fColorUniform;
GrColor fColor;
typedef GrGLSLPrimitiveProcessor INHERITED;
};
GrPathProcessor::GrPathProcessor(GrColor color,
const SkMatrix& viewMatrix,
const SkMatrix& localMatrix)
: INHERITED(kGrPathProcessor_ClassID)
, fColor(color)
, fViewMatrix(viewMatrix)
, fLocalMatrix(localMatrix) {}
void GrPathProcessor::getGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
GrGLPathProcessor::GenKey(*this, caps, b);
}
GrGLSLPrimitiveProcessor* GrPathProcessor::createGLSLInstance(const GrShaderCaps& caps) const {
SkASSERT(caps.pathRenderingSupport());
return new GrGLPathProcessor();
}
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