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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrFragmentProcessor.h"
#include "GrCoordTransform.h"
#include "GrInvariantOutput.h"
#include "GrPipeline.h"
#include "GrProcOptInfo.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProgramDataManager.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "effects/GrConstColorProcessor.h"
#include "effects/GrXfermodeFragmentProcessor.h"
GrFragmentProcessor::~GrFragmentProcessor() {
// If we got here then our ref count must have reached zero, so we will have converted refs
// to pending executions for all children.
for (int i = 0; i < fChildProcessors.count(); ++i) {
fChildProcessors[i]->completedExecution();
}
}
bool GrFragmentProcessor::isEqual(const GrFragmentProcessor& that) const {
if (this->classID() != that.classID() ||
!this->hasSameSamplersAndAccesses(that)) {
return false;
}
if (!this->hasSameTransforms(that)) {
return false;
}
if (!this->onIsEqual(that)) {
return false;
}
if (this->numChildProcessors() != that.numChildProcessors()) {
return false;
}
for (int i = 0; i < this->numChildProcessors(); ++i) {
if (!this->childProcessor(i).isEqual(that.childProcessor(i))) {
return false;
}
}
return true;
}
GrGLSLFragmentProcessor* GrFragmentProcessor::createGLSLInstance() const {
GrGLSLFragmentProcessor* glFragProc = this->onCreateGLSLInstance();
glFragProc->fChildProcessors.push_back_n(fChildProcessors.count());
for (int i = 0; i < fChildProcessors.count(); ++i) {
glFragProc->fChildProcessors[i] = fChildProcessors[i]->createGLSLInstance();
}
return glFragProc;
}
void GrFragmentProcessor::addCoordTransform(const GrCoordTransform* transform) {
fCoordTransforms.push_back(transform);
fUsesLocalCoords = true;
SkDEBUGCODE(transform->setInProcessor();)
}
int GrFragmentProcessor::registerChildProcessor(sk_sp<GrFragmentProcessor> child) {
this->combineRequiredFeatures(*child);
if (child->usesLocalCoords()) {
fUsesLocalCoords = true;
}
if (child->usesDistanceVectorField()) {
fUsesDistanceVectorField = true;
}
int index = fChildProcessors.count();
fChildProcessors.push_back(child.release());
return index;
}
void GrFragmentProcessor::notifyRefCntIsZero() const {
// See comment above GrProgramElement for a detailed explanation of why we do this.
for (int i = 0; i < fChildProcessors.count(); ++i) {
fChildProcessors[i]->addPendingExecution();
fChildProcessors[i]->unref();
}
}
bool GrFragmentProcessor::hasSameTransforms(const GrFragmentProcessor& that) const {
if (this->numCoordTransforms() != that.numCoordTransforms()) {
return false;
}
int count = this->numCoordTransforms();
for (int i = 0; i < count; ++i) {
if (this->coordTransform(i) != that.coordTransform(i)) {
return false;
}
}
return true;
}
sk_sp<GrFragmentProcessor> GrFragmentProcessor::MulOutputByInputAlpha(
sk_sp<GrFragmentProcessor> fp) {
if (!fp) {
return nullptr;
}
return GrXfermodeFragmentProcessor::MakeFromDstProcessor(std::move(fp), SkBlendMode::kDstIn);
}
sk_sp<GrFragmentProcessor> GrFragmentProcessor::PremulInput(sk_sp<GrFragmentProcessor> fp) {
class PremulInputFragmentProcessor : public GrFragmentProcessor {
public:
PremulInputFragmentProcessor() {
this->initClassID<PremulInputFragmentProcessor>();
}
const char* name() const override { return "PremultiplyInput"; }
private:
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
class GLFP : public GrGLSLFragmentProcessor {
public:
void emitCode(EmitArgs& args) override {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, args.fInputColor);
fragBuilder->codeAppendf("%s.rgb *= %s.a;",
args.fOutputColor, args.fInputColor);
}
};
return new GLFP;
}
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
inout->premulFourChannelColor();
}
};
if (!fp) {
return nullptr;
}
sk_sp<GrFragmentProcessor> fpPipeline[] = { sk_make_sp<PremulInputFragmentProcessor>(), fp};
return GrFragmentProcessor::RunInSeries(fpPipeline, 2);
}
sk_sp<GrFragmentProcessor> GrFragmentProcessor::MulOutputByInputUnpremulColor(
sk_sp<GrFragmentProcessor> fp) {
class PremulFragmentProcessor : public GrFragmentProcessor {
public:
PremulFragmentProcessor(sk_sp<GrFragmentProcessor> processor) {
this->initClassID<PremulFragmentProcessor>();
this->registerChildProcessor(processor);
}
const char* name() const override { return "Premultiply"; }
private:
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
class GLFP : public GrGLSLFragmentProcessor {
public:
void emitCode(EmitArgs& args) override {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
this->emitChild(0, nullptr, args);
fragBuilder->codeAppendf("%s.rgb *= %s.rgb;", args.fOutputColor,
args.fInputColor);
fragBuilder->codeAppendf("%s *= %s.a;", args.fOutputColor, args.fInputColor);
}
};
return new GLFP;
}
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
// TODO: Add a helper to GrInvariantOutput that handles multiplying by color with flags?
if (!(inout->validFlags() & kA_GrColorComponentFlag)) {
inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
return;
}
GrInvariantOutput childOutput(GrColor_WHITE, kRGBA_GrColorComponentFlags, false);
this->childProcessor(0).computeInvariantOutput(&childOutput);
if (0 == GrColorUnpackA(inout->color()) || 0 == GrColorUnpackA(childOutput.color())) {
inout->mulByKnownFourComponents(0x0);
return;
}
GrColorComponentFlags commonFlags = childOutput.validFlags() & inout->validFlags();
GrColor c0 = GrPremulColor(inout->color());
GrColor c1 = childOutput.color();
GrColor color = 0x0;
if (commonFlags & kR_GrColorComponentFlag) {
color |= SkMulDiv255Round(GrColorUnpackR(c0), GrColorUnpackR(c1)) <<
GrColor_SHIFT_R;
}
if (commonFlags & kG_GrColorComponentFlag) {
color |= SkMulDiv255Round(GrColorUnpackG(c0), GrColorUnpackG(c1)) <<
GrColor_SHIFT_G;
}
if (commonFlags & kB_GrColorComponentFlag) {
color |= SkMulDiv255Round(GrColorUnpackB(c0), GrColorUnpackB(c1)) <<
GrColor_SHIFT_B;
}
inout->setToOther(commonFlags, color, GrInvariantOutput::kWill_ReadInput);
}
};
if (!fp) {
return nullptr;
}
return sk_sp<GrFragmentProcessor>(new PremulFragmentProcessor(std::move(fp)));
}
//////////////////////////////////////////////////////////////////////////////
sk_sp<GrFragmentProcessor> GrFragmentProcessor::OverrideInput(sk_sp<GrFragmentProcessor> fp,
GrColor4f color) {
class ReplaceInputFragmentProcessor : public GrFragmentProcessor {
public:
ReplaceInputFragmentProcessor(sk_sp<GrFragmentProcessor> child, GrColor4f color)
: fColor(color) {
this->initClassID<ReplaceInputFragmentProcessor>();
this->registerChildProcessor(std::move(child));
}
const char* name() const override { return "Replace Color"; }
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
class GLFP : public GrGLSLFragmentProcessor {
public:
GLFP() : fHaveSetColor(false) {}
void emitCode(EmitArgs& args) override {
const char* colorName;
fColorUni = args.fUniformHandler->addUniform(kFragment_GrShaderFlag,
kVec4f_GrSLType,
kDefault_GrSLPrecision,
"Color", &colorName);
this->emitChild(0, colorName, args);
}
private:
void onSetData(const GrGLSLProgramDataManager& pdman,
const GrProcessor& fp) override {
GrColor4f color = fp.cast<ReplaceInputFragmentProcessor>().fColor;
if (!fHaveSetColor || color != fPreviousColor) {
pdman.set4fv(fColorUni, 1, color.fRGBA);
fPreviousColor = color;
fHaveSetColor = true;
}
}
GrGLSLProgramDataManager::UniformHandle fColorUni;
bool fHaveSetColor;
GrColor4f fPreviousColor;
};
return new GLFP;
}
private:
void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override
{}
bool onIsEqual(const GrFragmentProcessor& that) const override {
return fColor == that.cast<ReplaceInputFragmentProcessor>().fColor;
}
void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
inout->setToOther(kRGBA_GrColorComponentFlags, fColor.toGrColor(),
GrInvariantOutput::kWillNot_ReadInput);
this->childProcessor(0).computeInvariantOutput(inout);
}
GrColor4f fColor;
};
GrInvariantOutput childOut(0x0, kNone_GrColorComponentFlags, false);
fp->computeInvariantOutput(&childOut);
if (childOut.willUseInputColor()) {
return sk_sp<GrFragmentProcessor>(new ReplaceInputFragmentProcessor(std::move(fp), color));
} else {
return fp;
}
}
sk_sp<GrFragmentProcessor> GrFragmentProcessor::RunInSeries(sk_sp<GrFragmentProcessor>* series,
int cnt) {
class SeriesFragmentProcessor : public GrFragmentProcessor {
public:
SeriesFragmentProcessor(sk_sp<GrFragmentProcessor>* children, int cnt){
SkASSERT(cnt > 1);
this->initClassID<SeriesFragmentProcessor>();
for (int i = 0; i < cnt; ++i) {
this->registerChildProcessor(std::move(children[i]));
}
}
const char* name() const override { return "Series"; }
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
class GLFP : public GrGLSLFragmentProcessor {
public:
void emitCode(EmitArgs& args) override {
// First guy's input might be nil.
SkString temp("out0");
this->emitChild(0, args.fInputColor, &temp, args);
SkString input = temp;
for (int i = 1; i < this->numChildProcessors() - 1; ++i) {
temp.printf("out%d", i);
this->emitChild(i, input.c_str(), &temp, args);
input = temp;
}
// Last guy writes to our output variable.
this->emitChild(this->numChildProcessors() - 1, input.c_str(), args);
}
};
return new GLFP;
}
private:
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
GrProcOptInfo info;
info.calcWithInitialValues(fChildProcessors.begin(), fChildProcessors.count(),
inout->color(), inout->validFlags(), false, false);
for (int i = 0; i < this->numChildProcessors(); ++i) {
this->childProcessor(i).computeInvariantOutput(inout);
}
}
};
if (!cnt) {
return nullptr;
}
// Run the through the series, do the invariant output processing, and look for eliminations.
GrProcOptInfo info;
info.calcWithInitialValues(sk_sp_address_as_pointer_address(series), cnt,
0x0, kNone_GrColorComponentFlags, false, false);
if (kRGBA_GrColorComponentFlags == info.validFlags()) {
// TODO: We need to preserve 4f and color spaces during invariant processing. This color
// has definitely lost precision, and could easily be in the wrong gamut (or have been
// built from colors in multiple spaces).
return GrConstColorProcessor::Make(GrColor4f::FromGrColor(info.color()),
GrConstColorProcessor::kIgnore_InputMode);
}
SkTArray<sk_sp<GrFragmentProcessor>> replacementSeries;
int firstIdx = info.firstEffectiveProcessorIndex();
cnt -= firstIdx;
if (firstIdx > 0 && info.inputColorIsUsed()) {
// See comment above - need to preserve 4f and color spaces during invariant processing.
sk_sp<GrFragmentProcessor> colorFP(GrConstColorProcessor::Make(
GrColor4f::FromGrColor(info.inputColorToFirstEffectiveProccesor()),
GrConstColorProcessor::kIgnore_InputMode));
cnt += 1;
replacementSeries.reserve(cnt);
replacementSeries.emplace_back(std::move(colorFP));
for (int i = 0; i < cnt - 1; ++i) {
replacementSeries.emplace_back(std::move(series[firstIdx + i]));
}
series = replacementSeries.begin();
} else {
series += firstIdx;
cnt -= firstIdx;
}
if (1 == cnt) {
return series[0];
}
return sk_sp<GrFragmentProcessor>(new SeriesFragmentProcessor(series, cnt));
}
//////////////////////////////////////////////////////////////////////////////
GrFragmentProcessor::Iter::Iter(const GrPipeline& pipeline) {
for (int i = pipeline.numFragmentProcessors() - 1; i >= 0; --i) {
fFPStack.push_back(&pipeline.getFragmentProcessor(i));
}
}
const GrFragmentProcessor* GrFragmentProcessor::Iter::next() {
if (fFPStack.empty()) {
return nullptr;
}
const GrFragmentProcessor* back = fFPStack.back();
fFPStack.pop_back();
for (int i = back->numChildProcessors() - 1; i >= 0; --i) {
fFPStack.push_back(&back->childProcessor(i));
}
return back;
}