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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLSLColorSpaceXformHelper_DEFINED
#define GrGLSLColorSpaceXformHelper_DEFINED
#include "GrColorSpaceXform.h"
#include "GrGLSLUniformHandler.h"
#include "SkColorSpaceXformSteps.h"
/**
* Helper class to assist with using GrColorSpaceXform within an FP. This manages all of the
* uniforms needed, and can be passed to shader builder functions to automatically generate the
* correct color space transformation code.
*/
class GrGLSLColorSpaceXformHelper : public SkNoncopyable {
public:
GrGLSLColorSpaceXformHelper() {
memset(&fFlags, 0, sizeof(fFlags));
}
void emitCode(GrGLSLUniformHandler* uniformHandler, const GrColorSpaceXform* colorSpaceXform,
uint32_t visibility = kFragment_GrShaderFlag) {
SkASSERT(uniformHandler);
if (colorSpaceXform) {
fFlags = colorSpaceXform->fSteps.flags;
if (this->applySrcTF()) {
fSrcTFVar = uniformHandler->addUniformArray(visibility, kHalf_GrSLType,
"SrcTF", kNumTransferFnCoeffs);
}
if (this->applyGamutXform()) {
fGamutXformVar = uniformHandler->addUniform(visibility, kHalf3x3_GrSLType,
"ColorXform");
}
if (this->applyDstTF()) {
fDstTFVar = uniformHandler->addUniformArray(visibility, kHalf_GrSLType,
"DstTF", kNumTransferFnCoeffs);
}
}
}
void setData(const GrGLSLProgramDataManager& pdman, const GrColorSpaceXform* colorSpaceXform) {
if (this->applySrcTF()) {
pdman.set1fv(fSrcTFVar, kNumTransferFnCoeffs, &colorSpaceXform->fSteps.srcTF.fG);
}
if (this->applyGamutXform()) {
pdman.setMatrix3f(fGamutXformVar, colorSpaceXform->fSteps.src_to_dst_matrix);
}
if (this->applyDstTF()) {
pdman.set1fv(fDstTFVar, kNumTransferFnCoeffs, &colorSpaceXform->fSteps.dstTFInv.fG);
}
}
bool isNoop() const { return (0 == fFlags.mask()); }
bool applyUnpremul() const { return fFlags.unpremul; }
bool applySrcTF() const { return fFlags.linearize; }
bool applyGamutXform() const { return fFlags.gamut_transform; }
bool applyDstTF() const { return fFlags.encode; }
bool applyPremul() const { return fFlags.premul; }
GrGLSLProgramDataManager::UniformHandle srcTFUniform() const { return fSrcTFVar; }
GrGLSLProgramDataManager::UniformHandle gamutXformUniform() const { return fGamutXformVar; }
GrGLSLProgramDataManager::UniformHandle dstTFUniform() const { return fDstTFVar; }
private:
static const int kNumTransferFnCoeffs = 7;
GrGLSLProgramDataManager::UniformHandle fSrcTFVar;
GrGLSLProgramDataManager::UniformHandle fGamutXformVar;
GrGLSLProgramDataManager::UniformHandle fDstTFVar;
SkColorSpaceXformSteps::Flags fFlags;
};
#endif
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