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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "effects/GrCoverageSetOpXP.h"
#include "GrCaps.h"
#include "GrColor.h"
#include "GrPipeline.h"
#include "GrProcessor.h"
#include "GrRenderTargetContext.h"
#include "glsl/GrGLSLBlend.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "glsl/GrGLSLXferProcessor.h"
class CoverageSetOpXP : public GrXferProcessor {
public:
CoverageSetOpXP(SkRegion::Op regionOp, bool invertCoverage)
: INHERITED(kCoverageSetOpXP_ClassID)
, fRegionOp(regionOp)
, fInvertCoverage(invertCoverage) {}
const char* name() const override { return "Coverage Set Op"; }
GrGLSLXferProcessor* createGLSLInstance() const override;
bool invertCoverage() const { return fInvertCoverage; }
private:
void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override;
void onGetBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const override;
bool onIsEqual(const GrXferProcessor& xpBase) const override {
const CoverageSetOpXP& xp = xpBase.cast<CoverageSetOpXP>();
return (fRegionOp == xp.fRegionOp &&
fInvertCoverage == xp.fInvertCoverage);
}
SkRegion::Op fRegionOp;
bool fInvertCoverage;
typedef GrXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class GLCoverageSetOpXP : public GrGLSLXferProcessor {
public:
GLCoverageSetOpXP(const GrProcessor&) {}
~GLCoverageSetOpXP() override {}
static void GenKey(const GrProcessor& processor, const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) {
const CoverageSetOpXP& xp = processor.cast<CoverageSetOpXP>();
uint32_t key = xp.invertCoverage() ? 0x0 : 0x1;
b->add32(key);
}
private:
void emitOutputsForBlendState(const EmitArgs& args) override {
const CoverageSetOpXP& xp = args.fXP.cast<CoverageSetOpXP>();
GrGLSLXPFragmentBuilder* fragBuilder = args.fXPFragBuilder;
if (xp.invertCoverage()) {
fragBuilder->codeAppendf("%s = 1.0 - %s;", args.fOutputPrimary, args.fInputCoverage);
} else {
fragBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, args.fInputCoverage);
}
}
void onSetData(const GrGLSLProgramDataManager&, const GrXferProcessor&) override {}
typedef GrGLSLXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
void CoverageSetOpXP::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
GLCoverageSetOpXP::GenKey(*this, caps, b);
}
GrGLSLXferProcessor* CoverageSetOpXP::createGLSLInstance() const {
return new GLCoverageSetOpXP(*this);
}
void CoverageSetOpXP::onGetBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const {
switch (fRegionOp) {
case SkRegion::kReplace_Op:
blendInfo->fSrcBlend = kOne_GrBlendCoeff;
blendInfo->fDstBlend = kZero_GrBlendCoeff;
break;
case SkRegion::kIntersect_Op:
blendInfo->fSrcBlend = kDC_GrBlendCoeff;
blendInfo->fDstBlend = kZero_GrBlendCoeff;
break;
case SkRegion::kUnion_Op:
blendInfo->fSrcBlend = kOne_GrBlendCoeff;
blendInfo->fDstBlend = kISC_GrBlendCoeff;
break;
case SkRegion::kXOR_Op:
blendInfo->fSrcBlend = kIDC_GrBlendCoeff;
blendInfo->fDstBlend = kISC_GrBlendCoeff;
break;
case SkRegion::kDifference_Op:
blendInfo->fSrcBlend = kZero_GrBlendCoeff;
blendInfo->fDstBlend = kISC_GrBlendCoeff;
break;
case SkRegion::kReverseDifference_Op:
blendInfo->fSrcBlend = kIDC_GrBlendCoeff;
blendInfo->fDstBlend = kZero_GrBlendCoeff;
break;
}
blendInfo->fBlendConstant = 0;
}
///////////////////////////////////////////////////////////////////////////////
constexpr GrCoverageSetOpXPFactory::GrCoverageSetOpXPFactory(SkRegion::Op regionOp,
bool invertCoverage)
: fRegionOp(regionOp), fInvertCoverage(invertCoverage) {}
const GrXPFactory* GrCoverageSetOpXPFactory::Get(SkRegion::Op regionOp, bool invertCoverage) {
// If these objects are constructed as static constexpr by cl.exe (2015 SP2) the vtables are
// null.
#ifdef SK_BUILD_FOR_WIN
#define _CONSTEXPR_
#else
#define _CONSTEXPR_ constexpr
#endif
switch (regionOp) {
case SkRegion::kReplace_Op: {
if (invertCoverage) {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gReplaceCDXPFI(
SkRegion::kReplace_Op, true);
return &gReplaceCDXPFI;
} else {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gReplaceCDXPF(
SkRegion::kReplace_Op, false);
return &gReplaceCDXPF;
}
}
case SkRegion::kIntersect_Op: {
if (invertCoverage) {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gIntersectCDXPFI(
SkRegion::kIntersect_Op, true);
return &gIntersectCDXPFI;
} else {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gIntersectCDXPF(
SkRegion::kIntersect_Op, false);
return &gIntersectCDXPF;
}
}
case SkRegion::kUnion_Op: {
if (invertCoverage) {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gUnionCDXPFI(SkRegion::kUnion_Op,
true);
return &gUnionCDXPFI;
} else {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gUnionCDXPF(SkRegion::kUnion_Op,
false);
return &gUnionCDXPF;
}
}
case SkRegion::kXOR_Op: {
if (invertCoverage) {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gXORCDXPFI(SkRegion::kXOR_Op,
true);
return &gXORCDXPFI;
} else {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gXORCDXPF(SkRegion::kXOR_Op,
false);
return &gXORCDXPF;
}
}
case SkRegion::kDifference_Op: {
if (invertCoverage) {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gDifferenceCDXPFI(
SkRegion::kDifference_Op, true);
return &gDifferenceCDXPFI;
} else {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gDifferenceCDXPF(
SkRegion::kDifference_Op, false);
return &gDifferenceCDXPF;
}
}
case SkRegion::kReverseDifference_Op: {
if (invertCoverage) {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gRevDiffCDXPFI(
SkRegion::kReverseDifference_Op, true);
return &gRevDiffCDXPFI;
} else {
static _CONSTEXPR_ const GrCoverageSetOpXPFactory gRevDiffCDXPF(
SkRegion::kReverseDifference_Op, false);
return &gRevDiffCDXPF;
}
}
}
#undef _CONSTEXPR_
SK_ABORT("Unknown region op.");
return nullptr;
}
sk_sp<const GrXferProcessor> GrCoverageSetOpXPFactory::makeXferProcessor(
const GrProcessorAnalysisColor&,
GrProcessorAnalysisCoverage,
bool hasMixedSamples,
const GrCaps& caps) const {
// We don't support inverting coverage with mixed samples. We don't expect to ever want this in
// the future, however we could at some point make this work using an inverted coverage
// modulation table. Note that an inverted table still won't work if there are coverage procs.
if (fInvertCoverage && hasMixedSamples) {
SkASSERT(false);
return nullptr;
}
return sk_sp<GrXferProcessor>(new CoverageSetOpXP(fRegionOp, fInvertCoverage));
}
GR_DEFINE_XP_FACTORY_TEST(GrCoverageSetOpXPFactory);
#if GR_TEST_UTILS
const GrXPFactory* GrCoverageSetOpXPFactory::TestGet(GrProcessorTestData* d) {
SkRegion::Op regionOp = SkRegion::Op(d->fRandom->nextULessThan(SkRegion::kLastOp + 1));
bool isMixedSamples = GrFSAAType::kMixedSamples == d->fRenderTargetContext->fsaaType();
bool invertCoverage = !isMixedSamples && d->fRandom->nextBool();
return GrCoverageSetOpXPFactory::Get(regionOp, invertCoverage);
}
#endif
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