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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 "gl/GrGLGpu.h"
#include "glsl/GrGLSLCaps.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProcessorTypes.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 GrGLSLCaps&,
GrProcessorKeyBuilder* b) {
b->add32(SkToInt(pathProc.overrides().readsColor()) |
(SkToInt(pathProc.overrides().readsCoverage()) << 1) |
(SkToInt(pathProc.viewMatrix().hasPerspective()) << 2));
}
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.fTransformsIn, args.fTransformsOut);
// Setup uniform color
if (pathProc.overrides().readsColor()) {
const char* stagedLocalVarName;
fColorUniform = args.fUniformHandler->addUniform(kFragment_GrShaderFlag,
kVec4f_GrSLType,
kDefault_GrSLPrecision,
"Color",
&stagedLocalVarName);
fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, stagedLocalVarName);
}
// setup constant solid coverage
if (pathProc.overrides().readsCoverage()) {
fragBuilder->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
}
}
void emitTransforms(GrGLSLVaryingHandler* varyingHandler,
const TransformsIn& tin,
TransformsOut* tout) {
tout->push_back_n(tin.count());
fInstalledTransforms.push_back_n(tin.count());
for (int i = 0; i < tin.count(); i++) {
const ProcCoords& coordTransforms = tin[i];
fInstalledTransforms[i].push_back_n(coordTransforms.count());
for (int t = 0; t < coordTransforms.count(); t++) {
GrSLType varyingType =
coordTransforms[t]->getMatrix().hasPerspective() ? kVec3f_GrSLType :
kVec2f_GrSLType;
SkString strVaryingName("MatrixCoord");
strVaryingName.appendf("_%i_%i", i, t);
GrGLSLVertToFrag v(varyingType);
GrGLVaryingHandler* glVaryingHandler = (GrGLVaryingHandler*) varyingHandler;
fInstalledTransforms[i][t].fHandle =
glVaryingHandler->addPathProcessingVarying(strVaryingName.c_str(),
&v).toIndex();
fInstalledTransforms[i][t].fType = varyingType;
(*tout)[i].emplace_back(SkString(v.fsIn()), varyingType);
}
}
}
void setData(const GrGLSLProgramDataManager& pd,
const GrPrimitiveProcessor& primProc) override {
const GrPathProcessor& pathProc = primProc.cast<GrPathProcessor>();
if (pathProc.overrides().readsColor() && pathProc.color() != fColor) {
float c[4];
GrColorToRGBAFloat(pathProc.color(), c);
pd.set4fv(fColorUniform, 1, c);
fColor = pathProc.color();
}
}
void setTransformData(const GrPrimitiveProcessor& primProc,
const GrGLSLProgramDataManager& pdman,
int index,
const SkTArray<const GrCoordTransform*, true>& coordTransforms) override {
const GrPathProcessor& pathProc = primProc.cast<GrPathProcessor>();
SkSTArray<2, VaryingTransform, true>& transforms = fInstalledTransforms[index];
int numTransforms = transforms.count();
for (int t = 0; t < numTransforms; ++t) {
SkASSERT(transforms[t].fHandle.isValid());
const SkMatrix& transform = GetTransformMatrix(pathProc.localMatrix(),
*coordTransforms[t]);
if (transforms[t].fCurrentValue.cheapEqualTo(transform)) {
continue;
}
transforms[t].fCurrentValue = transform;
SkASSERT(transforms[t].fType == kVec2f_GrSLType ||
transforms[t].fType == kVec3f_GrSLType);
unsigned components = transforms[t].fType == kVec2f_GrSLType ? 2 : 3;
pdman.setPathFragmentInputTransform(transforms[t].fHandle, components, transform);
}
}
private:
typedef GrGLSLProgramDataManager::VaryingHandle VaryingHandle;
struct VaryingTransform : public Transform {
VaryingTransform() : Transform() {}
VaryingHandle fHandle;
};
SkSTArray<8, SkSTArray<2, VaryingTransform, true> > fInstalledTransforms;
UniformHandle fColorUniform;
GrColor fColor;
typedef GrGLSLPrimitiveProcessor INHERITED;
};
GrPathProcessor::GrPathProcessor(GrColor color,
const GrXPOverridesForBatch& overrides,
const SkMatrix& viewMatrix,
const SkMatrix& localMatrix)
: fColor(color)
, fViewMatrix(viewMatrix)
, fLocalMatrix(localMatrix)
, fOverrides(overrides) {
this->initClassID<GrPathProcessor>();
}
void GrPathProcessor::getGLSLProcessorKey(const GrGLSLCaps& caps,
GrProcessorKeyBuilder* b) const {
GrGLPathProcessor::GenKey(*this, caps, b);
}
GrGLSLPrimitiveProcessor* GrPathProcessor::createGLSLInstance(const GrGLSLCaps& caps) const {
SkASSERT(caps.pathRenderingSupport());
return new GrGLPathProcessor();
}
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