src/gpu/effects/GrTextureDomain.cpp - skia - Git at Google

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrTextureDomain.h"
 #include "GrInvariantOutput.h"
 #include "GrSimpleTextureEffect.h"
 #include "SkFloatingPoint.h"
 #include "gl/GrGLProcessor.h"
 #include "gl/builders/GrGLProgramBuilder.h"

 GrTextureDomain::GrTextureDomain(const SkRect& domain, Mode mode, int index)
     : fIndex(index) {

     static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1};
     if (domain.contains(kFullRect) && kClamp_Mode == mode) {
         fMode = kIgnore_Mode;
     } else {
         fMode = mode;
     }

     if (fMode != kIgnore_Mode) {
         // We don't currently handle domains that are empty or don't intersect the texture.
         // It is OK if the domain rect is a line or point, but it should not be inverted. We do not
         // handle rects that do not intersect the [0..1]x[0..1] rect.
         SkASSERT(domain.fLeft <= domain.fRight);
         SkASSERT(domain.fTop <= domain.fBottom);
         fDomain.fLeft = SkScalarPin(domain.fLeft, kFullRect.fLeft, kFullRect.fRight);
         fDomain.fRight = SkScalarPin(domain.fRight, kFullRect.fLeft, kFullRect.fRight);
         fDomain.fTop = SkScalarPin(domain.fTop, kFullRect.fTop, kFullRect.fBottom);
         fDomain.fBottom = SkScalarPin(domain.fBottom, kFullRect.fTop, kFullRect.fBottom);
         SkASSERT(fDomain.fLeft <= fDomain.fRight);
         SkASSERT(fDomain.fTop <= fDomain.fBottom);
     }
 }

 //////////////////////////////////////////////////////////////////////////////

 void GrTextureDomain::GLDomain::sampleTexture(GrGLShaderBuilder* builder,
                                               const GrTextureDomain& textureDomain,
                                               const char* outColor,
                                               const SkString& inCoords,
                                               const GrGLProcessor::TextureSampler sampler,
                                               const char* inModulateColor) {
     SkASSERT((Mode)-1 == fMode || textureDomain.mode() == fMode);
     SkDEBUGCODE(fMode = textureDomain.mode();)

     GrGLProgramBuilder* program = builder->getProgramBuilder();

     if (textureDomain.mode() != kIgnore_Mode && !fDomainUni.isValid()) {
         const char* name;
         SkString uniName("TexDom");
         if (textureDomain.fIndex >= 0) {
             uniName.appendS32(textureDomain.fIndex);
         }
         fDomainUni = program->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                          kVec4f_GrSLType, kDefault_GrSLPrecision,
                                          uniName.c_str(), &name);
         fDomainName = name;
     }

     switch (textureDomain.mode()) {
         case kIgnore_Mode: {
             builder->codeAppendf("\t%s = ", outColor);
             builder->appendTextureLookupAndModulate(inModulateColor, sampler,
                                                       inCoords.c_str());
             builder->codeAppend(";\n");
             break;
         }
         case kClamp_Mode: {
             SkString clampedCoords;
             clampedCoords.appendf("\tclamp(%s, %s.xy, %s.zw)",
                                   inCoords.c_str(), fDomainName.c_str(), fDomainName.c_str());

             builder->codeAppendf("\t%s = ", outColor);
             builder->appendTextureLookupAndModulate(inModulateColor, sampler,
                                                       clampedCoords.c_str());
             builder->codeAppend(";\n");
             break;
         }
         case kDecal_Mode: {
             // Add a block since we're going to declare variables.
             GrGLShaderBuilder::ShaderBlock block(builder);

             const char* domain = fDomainName.c_str();
             if (kImagination_GrGLVendor == program->ctxInfo().vendor()) {
                 // On the NexusS and GalaxyNexus, the other path (with the 'any'
                 // call) causes the compilation error "Calls to any function that
                 // may require a gradient calculation inside a conditional block
                 // may return undefined results". This appears to be an issue with
                 // the 'any' call since even the simple "result=black; if (any())
                 // result=white;" code fails to compile.
                 builder->codeAppend("\tvec4 outside = vec4(0.0, 0.0, 0.0, 0.0);\n");
                 builder->codeAppend("\tvec4 inside = ");
                 builder->appendTextureLookupAndModulate(inModulateColor, sampler,
                                                           inCoords.c_str());
                 builder->codeAppend(";\n");
                 builder->codeAppendf("\tfloat x = (%s).x;\n", inCoords.c_str());
                 builder->codeAppendf("\tfloat y = (%s).y;\n", inCoords.c_str());

                 builder->codeAppendf("\tx = abs(2.0*(x - %s.x)/(%s.z - %s.x) - 1.0);\n",
                                        domain, domain, domain);
                 builder->codeAppendf("\ty = abs(2.0*(y - %s.y)/(%s.w - %s.y) - 1.0);\n",
                                        domain, domain, domain);
                 builder->codeAppend("\tfloat blend = step(1.0, max(x, y));\n");
                 builder->codeAppendf("\t%s = mix(inside, outside, blend);\n", outColor);
             } else {
                 builder->codeAppend("\tbvec4 outside;\n");
                 builder->codeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", inCoords.c_str(),
                                        domain);
                 builder->codeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", inCoords.c_str(),
                                        domain);
                 builder->codeAppendf("\t%s = any(outside) ? vec4(0.0, 0.0, 0.0, 0.0) : ",
                                        outColor);
                 builder->appendTextureLookupAndModulate(inModulateColor, sampler,
                                                           inCoords.c_str());
                 builder->codeAppend(";\n");
             }
             break;
         }
         case kRepeat_Mode: {
             SkString clampedCoords;
             clampedCoords.printf("\tmod(%s - %s.xy, %s.zw - %s.xy) + %s.xy",
                                  inCoords.c_str(), fDomainName.c_str(), fDomainName.c_str(),
                                  fDomainName.c_str(), fDomainName.c_str());

             builder->codeAppendf("\t%s = ", outColor);
             builder->appendTextureLookupAndModulate(inModulateColor, sampler,
                                                       clampedCoords.c_str());
             builder->codeAppend(";\n");
             break;
         }
     }
 }

 void GrTextureDomain::GLDomain::setData(const GrGLProgramDataManager& pdman,
                                         const GrTextureDomain& textureDomain,
                                         GrSurfaceOrigin textureOrigin) {
     SkASSERT(textureDomain.mode() == fMode);
     if (kIgnore_Mode != textureDomain.mode()) {
         GrGLfloat values[4] = {
             SkScalarToFloat(textureDomain.domain().left()),
             SkScalarToFloat(textureDomain.domain().top()),
             SkScalarToFloat(textureDomain.domain().right()),
             SkScalarToFloat(textureDomain.domain().bottom())
         };
         // vertical flip if necessary
         if (kBottomLeft_GrSurfaceOrigin == textureOrigin) {
             values[1] = 1.0f - values[1];
             values[3] = 1.0f - values[3];
             // The top and bottom were just flipped, so correct the ordering
             // of elements so that values = (l, t, r, b).
             SkTSwap(values[1], values[3]);
         }
         if (0 != memcmp(values, fPrevDomain, 4 * sizeof(GrGLfloat))) {
             pdman.set4fv(fDomainUni, 1, values);
             memcpy(fPrevDomain, values, 4 * sizeof(GrGLfloat));
         }
     }
 }


 //////////////////////////////////////////////////////////////////////////////

 class GrGLTextureDomainEffect : public GrGLFragmentProcessor {
 public:
     GrGLTextureDomainEffect(const GrProcessor&);

     virtual void emitCode(GrGLFPBuilder*,
                           const GrFragmentProcessor&,
                           const char* outputColor,
                           const char* inputColor,
                           const TransformedCoordsArray&,
                           const TextureSamplerArray&) override;

     void setData(const GrGLProgramDataManager&, const GrProcessor&) override;

     static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*);

 private:
     GrTextureDomain::GLDomain         fGLDomain;
     typedef GrGLFragmentProcessor INHERITED;
 };

 GrGLTextureDomainEffect::GrGLTextureDomainEffect(const GrProcessor&) {
 }

 void GrGLTextureDomainEffect::emitCode(GrGLFPBuilder* builder,
                                        const GrFragmentProcessor& fp,
                                        const char* outputColor,
                                        const char* inputColor,
                                        const TransformedCoordsArray& coords,
                                        const TextureSamplerArray& samplers) {
     const GrTextureDomainEffect& textureDomainEffect = fp.cast<GrTextureDomainEffect>();
     const GrTextureDomain& domain = textureDomainEffect.textureDomain();

     GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
     SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
     fGLDomain.sampleTexture(fsBuilder, domain, outputColor, coords2D, samplers[0], inputColor);
 }

 void GrGLTextureDomainEffect::setData(const GrGLProgramDataManager& pdman,
                                       const GrProcessor& processor) {
     const GrTextureDomainEffect& textureDomainEffect = processor.cast<GrTextureDomainEffect>();
     const GrTextureDomain& domain = textureDomainEffect.textureDomain();
     fGLDomain.setData(pdman, domain, processor.texture(0)->origin());
 }

 void GrGLTextureDomainEffect::GenKey(const GrProcessor& processor, const GrGLSLCaps&,
                                      GrProcessorKeyBuilder* b) {
     const GrTextureDomain& domain = processor.cast<GrTextureDomainEffect>().textureDomain();
     b->add32(GrTextureDomain::GLDomain::DomainKey(domain));
 }


 ///////////////////////////////////////////////////////////////////////////////

 GrFragmentProcessor* GrTextureDomainEffect::Create(GrTexture* texture,
                                                    const SkMatrix& matrix,
                                                    const SkRect& domain,
                                                    GrTextureDomain::Mode mode,
                                                    GrTextureParams::FilterMode filterMode,
                                                    GrCoordSet coordSet) {
     static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1};
     if (GrTextureDomain::kIgnore_Mode == mode ||
         (GrTextureDomain::kClamp_Mode == mode && domain.contains(kFullRect))) {
         return GrSimpleTextureEffect::Create(texture, matrix, filterMode);
     } else {

         return SkNEW_ARGS(GrTextureDomainEffect, (texture,
                                                   matrix,
                                                   domain,
                                                   mode,
                                                   filterMode,
                                                   coordSet));
     }
 }

 GrTextureDomainEffect::GrTextureDomainEffect(GrTexture* texture,
                                              const SkMatrix& matrix,
                                              const SkRect& domain,
                                              GrTextureDomain::Mode mode,
                                              GrTextureParams::FilterMode filterMode,
                                              GrCoordSet coordSet)
     : GrSingleTextureEffect(texture, matrix, filterMode, coordSet)
     , fTextureDomain(domain, mode) {
     SkASSERT(mode != GrTextureDomain::kRepeat_Mode ||
             filterMode == GrTextureParams::kNone_FilterMode);
     this->initClassID<GrTextureDomainEffect>();
 }

 GrTextureDomainEffect::~GrTextureDomainEffect() {

 }

 void GrTextureDomainEffect::getGLProcessorKey(const GrGLSLCaps& caps,
                                               GrProcessorKeyBuilder* b) const {
     GrGLTextureDomainEffect::GenKey(*this, caps, b);
 }

 GrGLFragmentProcessor* GrTextureDomainEffect::createGLInstance() const  {
     return SkNEW_ARGS(GrGLTextureDomainEffect, (*this));
 }

 bool GrTextureDomainEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
     const GrTextureDomainEffect& s = sBase.cast<GrTextureDomainEffect>();
     return this->fTextureDomain == s.fTextureDomain;
 }

 void GrTextureDomainEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
     if (GrTextureDomain::kDecal_Mode == fTextureDomain.mode()) { // TODO: helper
         if (GrPixelConfigIsAlphaOnly(this->texture(0)->config())) {
             inout->mulByUnknownSingleComponent();
         } else {
             inout->mulByUnknownFourComponents();
         }
     } else {
         this->updateInvariantOutputForModulation(inout);
     }
 }

 ///////////////////////////////////////////////////////////////////////////////

 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrTextureDomainEffect);

 GrFragmentProcessor* GrTextureDomainEffect::TestCreate(SkRandom* random,
                                                        GrContext*,
                                                        const GrCaps&,
                                                        GrTexture* textures[]) {
     int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
                                       GrProcessorUnitTest::kAlphaTextureIdx;
     SkRect domain;
     domain.fLeft = random->nextUScalar1();
     domain.fRight = random->nextRangeScalar(domain.fLeft, SK_Scalar1);
     domain.fTop = random->nextUScalar1();
     domain.fBottom = random->nextRangeScalar(domain.fTop, SK_Scalar1);
     GrTextureDomain::Mode mode =
         (GrTextureDomain::Mode) random->nextULessThan(GrTextureDomain::kModeCount);
     const SkMatrix& matrix = GrTest::TestMatrix(random);
     bool bilerp = mode != GrTextureDomain::kRepeat_Mode ? random->nextBool() : false;
     GrCoordSet coords = random->nextBool() ? kLocal_GrCoordSet : kDevice_GrCoordSet;
     return GrTextureDomainEffect::Create(textures[texIdx],
                                          matrix,
                                          domain,
                                          mode,
                                          bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode,
                                          coords);
 }
	/*
	* Copyright 2012 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrTextureDomain.h"
	#include "GrInvariantOutput.h"
	#include "GrSimpleTextureEffect.h"
	#include "SkFloatingPoint.h"
	#include "gl/GrGLProcessor.h"
	#include "gl/builders/GrGLProgramBuilder.h"

	GrTextureDomain::GrTextureDomain(const SkRect& domain, Mode mode, int index)
	: fIndex(index) {

	static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1};
	if (domain.contains(kFullRect) && kClamp_Mode == mode) {
	fMode = kIgnore_Mode;
	} else {
	fMode = mode;
	}

	if (fMode != kIgnore_Mode) {
	// We don't currently handle domains that are empty or don't intersect the texture.
	// It is OK if the domain rect is a line or point, but it should not be inverted. We do not
	// handle rects that do not intersect the [0..1]x[0..1] rect.
	SkASSERT(domain.fLeft <= domain.fRight);
	SkASSERT(domain.fTop <= domain.fBottom);
	fDomain.fLeft = SkScalarPin(domain.fLeft, kFullRect.fLeft, kFullRect.fRight);
	fDomain.fRight = SkScalarPin(domain.fRight, kFullRect.fLeft, kFullRect.fRight);
	fDomain.fTop = SkScalarPin(domain.fTop, kFullRect.fTop, kFullRect.fBottom);
	fDomain.fBottom = SkScalarPin(domain.fBottom, kFullRect.fTop, kFullRect.fBottom);
	SkASSERT(fDomain.fLeft <= fDomain.fRight);
	SkASSERT(fDomain.fTop <= fDomain.fBottom);
	}
	}

	//////////////////////////////////////////////////////////////////////////////

	void GrTextureDomain::GLDomain::sampleTexture(GrGLShaderBuilder* builder,
	const GrTextureDomain& textureDomain,
	const char* outColor,
	const SkString& inCoords,
	const GrGLProcessor::TextureSampler sampler,
	const char* inModulateColor) {
	SkASSERT((Mode)-1 == fMode \|\| textureDomain.mode() == fMode);
	SkDEBUGCODE(fMode = textureDomain.mode();)

	GrGLProgramBuilder* program = builder->getProgramBuilder();

	if (textureDomain.mode() != kIgnore_Mode && !fDomainUni.isValid()) {
	const char* name;
	SkString uniName("TexDom");
	if (textureDomain.fIndex >= 0) {
	uniName.appendS32(textureDomain.fIndex);
	}
	fDomainUni = program->addUniform(GrGLProgramBuilder::kFragment_Visibility,
	kVec4f_GrSLType, kDefault_GrSLPrecision,
	uniName.c_str(), &name);
	fDomainName = name;
	}

	switch (textureDomain.mode()) {
	case kIgnore_Mode: {
	builder->codeAppendf("\t%s = ", outColor);
	builder->appendTextureLookupAndModulate(inModulateColor, sampler,
	inCoords.c_str());
	builder->codeAppend(";\n");
	break;
	}
	case kClamp_Mode: {
	SkString clampedCoords;
	clampedCoords.appendf("\tclamp(%s, %s.xy, %s.zw)",
	inCoords.c_str(), fDomainName.c_str(), fDomainName.c_str());

	builder->codeAppendf("\t%s = ", outColor);
	builder->appendTextureLookupAndModulate(inModulateColor, sampler,
	clampedCoords.c_str());
	builder->codeAppend(";\n");
	break;
	}
	case kDecal_Mode: {
	// Add a block since we're going to declare variables.
	GrGLShaderBuilder::ShaderBlock block(builder);

	const char* domain = fDomainName.c_str();
	if (kImagination_GrGLVendor == program->ctxInfo().vendor()) {
	// On the NexusS and GalaxyNexus, the other path (with the 'any'
	// call) causes the compilation error "Calls to any function that
	// may require a gradient calculation inside a conditional block
	// may return undefined results". This appears to be an issue with
	// the 'any' call since even the simple "result=black; if (any())
	// result=white;" code fails to compile.
	builder->codeAppend("\tvec4 outside = vec4(0.0, 0.0, 0.0, 0.0);\n");
	builder->codeAppend("\tvec4 inside = ");
	builder->appendTextureLookupAndModulate(inModulateColor, sampler,
	inCoords.c_str());
	builder->codeAppend(";\n");
	builder->codeAppendf("\tfloat x = (%s).x;\n", inCoords.c_str());
	builder->codeAppendf("\tfloat y = (%s).y;\n", inCoords.c_str());

	builder->codeAppendf("\tx = abs(2.0*(x - %s.x)/(%s.z - %s.x) - 1.0);\n",
	domain, domain, domain);
	builder->codeAppendf("\ty = abs(2.0*(y - %s.y)/(%s.w - %s.y) - 1.0);\n",
	domain, domain, domain);
	builder->codeAppend("\tfloat blend = step(1.0, max(x, y));\n");
	builder->codeAppendf("\t%s = mix(inside, outside, blend);\n", outColor);
	} else {
	builder->codeAppend("\tbvec4 outside;\n");
	builder->codeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", inCoords.c_str(),
	domain);
	builder->codeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", inCoords.c_str(),
	domain);
	builder->codeAppendf("\t%s = any(outside) ? vec4(0.0, 0.0, 0.0, 0.0) : ",
	outColor);
	builder->appendTextureLookupAndModulate(inModulateColor, sampler,
	inCoords.c_str());
	builder->codeAppend(";\n");
	}
	break;
	}
	case kRepeat_Mode: {
	SkString clampedCoords;
	clampedCoords.printf("\tmod(%s - %s.xy, %s.zw - %s.xy) + %s.xy",
	inCoords.c_str(), fDomainName.c_str(), fDomainName.c_str(),
	fDomainName.c_str(), fDomainName.c_str());

	builder->codeAppendf("\t%s = ", outColor);
	builder->appendTextureLookupAndModulate(inModulateColor, sampler,
	clampedCoords.c_str());
	builder->codeAppend(";\n");
	break;
	}
	}
	}

	void GrTextureDomain::GLDomain::setData(const GrGLProgramDataManager& pdman,
	const GrTextureDomain& textureDomain,
	GrSurfaceOrigin textureOrigin) {
	SkASSERT(textureDomain.mode() == fMode);
	if (kIgnore_Mode != textureDomain.mode()) {
	GrGLfloat values[4] = {
	SkScalarToFloat(textureDomain.domain().left()),
	SkScalarToFloat(textureDomain.domain().top()),
	SkScalarToFloat(textureDomain.domain().right()),
	SkScalarToFloat(textureDomain.domain().bottom())
	};
	// vertical flip if necessary
	if (kBottomLeft_GrSurfaceOrigin == textureOrigin) {
	values[1] = 1.0f - values[1];
	values[3] = 1.0f - values[3];
	// The top and bottom were just flipped, so correct the ordering
	// of elements so that values = (l, t, r, b).
	SkTSwap(values[1], values[3]);
	}
	if (0 != memcmp(values, fPrevDomain, 4 * sizeof(GrGLfloat))) {
	pdman.set4fv(fDomainUni, 1, values);
	memcpy(fPrevDomain, values, 4 * sizeof(GrGLfloat));
	}
	}
	}


	//////////////////////////////////////////////////////////////////////////////

	class GrGLTextureDomainEffect : public GrGLFragmentProcessor {
	public:
	GrGLTextureDomainEffect(const GrProcessor&);

	virtual void emitCode(GrGLFPBuilder*,
	const GrFragmentProcessor&,
	const char* outputColor,
	const char* inputColor,
	const TransformedCoordsArray&,
	const TextureSamplerArray&) override;

	void setData(const GrGLProgramDataManager&, const GrProcessor&) override;

	static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*);

	private:
	GrTextureDomain::GLDomain fGLDomain;
	typedef GrGLFragmentProcessor INHERITED;
	};

	GrGLTextureDomainEffect::GrGLTextureDomainEffect(const GrProcessor&) {
	}

	void GrGLTextureDomainEffect::emitCode(GrGLFPBuilder* builder,
	const GrFragmentProcessor& fp,
	const char* outputColor,
	const char* inputColor,
	const TransformedCoordsArray& coords,
	const TextureSamplerArray& samplers) {
	const GrTextureDomainEffect& textureDomainEffect = fp.cast<GrTextureDomainEffect>();
	const GrTextureDomain& domain = textureDomainEffect.textureDomain();

	GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
	SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
	fGLDomain.sampleTexture(fsBuilder, domain, outputColor, coords2D, samplers[0], inputColor);
	}

	void GrGLTextureDomainEffect::setData(const GrGLProgramDataManager& pdman,
	const GrProcessor& processor) {
	const GrTextureDomainEffect& textureDomainEffect = processor.cast<GrTextureDomainEffect>();
	const GrTextureDomain& domain = textureDomainEffect.textureDomain();
	fGLDomain.setData(pdman, domain, processor.texture(0)->origin());
	}

	void GrGLTextureDomainEffect::GenKey(const GrProcessor& processor, const GrGLSLCaps&,
	GrProcessorKeyBuilder* b) {
	const GrTextureDomain& domain = processor.cast<GrTextureDomainEffect>().textureDomain();
	b->add32(GrTextureDomain::GLDomain::DomainKey(domain));
	}


	///////////////////////////////////////////////////////////////////////////////

	GrFragmentProcessor* GrTextureDomainEffect::Create(GrTexture* texture,
	const SkMatrix& matrix,
	const SkRect& domain,
	GrTextureDomain::Mode mode,
	GrTextureParams::FilterMode filterMode,
	GrCoordSet coordSet) {
	static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1};
	if (GrTextureDomain::kIgnore_Mode == mode \|\|
	(GrTextureDomain::kClamp_Mode == mode && domain.contains(kFullRect))) {
	return GrSimpleTextureEffect::Create(texture, matrix, filterMode);
	} else {

	return SkNEW_ARGS(GrTextureDomainEffect, (texture,
	matrix,
	domain,
	mode,
	filterMode,
	coordSet));
	}
	}

	GrTextureDomainEffect::GrTextureDomainEffect(GrTexture* texture,
	const SkMatrix& matrix,
	const SkRect& domain,
	GrTextureDomain::Mode mode,
	GrTextureParams::FilterMode filterMode,
	GrCoordSet coordSet)
	: GrSingleTextureEffect(texture, matrix, filterMode, coordSet)
	, fTextureDomain(domain, mode) {
	SkASSERT(mode != GrTextureDomain::kRepeat_Mode \|\|
	filterMode == GrTextureParams::kNone_FilterMode);
	this->initClassID<GrTextureDomainEffect>();
	}

	GrTextureDomainEffect::~GrTextureDomainEffect() {

	}

	void GrTextureDomainEffect::getGLProcessorKey(const GrGLSLCaps& caps,
	GrProcessorKeyBuilder* b) const {
	GrGLTextureDomainEffect::GenKey(*this, caps, b);
	}

	GrGLFragmentProcessor* GrTextureDomainEffect::createGLInstance() const {
	return SkNEW_ARGS(GrGLTextureDomainEffect, (*this));
	}

	bool GrTextureDomainEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
	const GrTextureDomainEffect& s = sBase.cast<GrTextureDomainEffect>();
	return this->fTextureDomain == s.fTextureDomain;
	}

	void GrTextureDomainEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
	if (GrTextureDomain::kDecal_Mode == fTextureDomain.mode()) { // TODO: helper
	if (GrPixelConfigIsAlphaOnly(this->texture(0)->config())) {
	inout->mulByUnknownSingleComponent();
	} else {
	inout->mulByUnknownFourComponents();
	}
	} else {
	this->updateInvariantOutputForModulation(inout);
	}
	}

	///////////////////////////////////////////////////////////////////////////////

	GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrTextureDomainEffect);

	GrFragmentProcessor* GrTextureDomainEffect::TestCreate(SkRandom* random,
	GrContext*,
	const GrCaps&,
	GrTexture* textures[]) {
	int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
	GrProcessorUnitTest::kAlphaTextureIdx;
	SkRect domain;
	domain.fLeft = random->nextUScalar1();
	domain.fRight = random->nextRangeScalar(domain.fLeft, SK_Scalar1);
	domain.fTop = random->nextUScalar1();
	domain.fBottom = random->nextRangeScalar(domain.fTop, SK_Scalar1);
	GrTextureDomain::Mode mode =
	(GrTextureDomain::Mode) random->nextULessThan(GrTextureDomain::kModeCount);
	const SkMatrix& matrix = GrTest::TestMatrix(random);
	bool bilerp = mode != GrTextureDomain::kRepeat_Mode ? random->nextBool() : false;
	GrCoordSet coords = random->nextBool() ? kLocal_GrCoordSet : kDevice_GrCoordSet;
	return GrTextureDomainEffect::Create(textures[texIdx],
	matrix,
	domain,
	mode,
	bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode,
	coords);
	}