src/gpu/effects/GrConvolutionEffect.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 "GrConvolutionEffect.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
 #include "glsl/GrGLSLUniformHandler.h"
 #include "../private/GrGLSL.h"

 // For brevity
 typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;

 class GrGLConvolutionEffect : public GrGLSLFragmentProcessor {
 public:
     void emitCode(EmitArgs&) override;

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

 protected:
     void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor&) override;

 private:
     UniformHandle       fKernelUni;
     UniformHandle       fImageIncrementUni;
     UniformHandle       fBoundsUni;

     typedef GrGLSLFragmentProcessor INHERITED;
 };

 void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
     const GrConvolutionEffect& ce = args.fFp.cast<GrConvolutionEffect>();

     GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
     fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                     kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                     "ImageIncrement");
     if (ce.useBounds()) {
         fBoundsUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                 kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                 "Bounds");
     }

     int width = Gr1DKernelEffect::WidthFromRadius(ce.radius());

     int arrayCount = (width + 3) / 4;
     SkASSERT(4 * arrayCount >= width);

     fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
                                                  kVec4f_GrSLType, kDefault_GrSLPrecision,
                                                  "Kernel", arrayCount);

     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);

     fragBuilder->codeAppendf("%s = vec4(0, 0, 0, 0);", args.fOutputColor);

     const GrShaderVar& kernel = uniformHandler->getUniformVariable(fKernelUni);
     const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);

     fragBuilder->codeAppendf("vec2 coord = %s - %d.0 * %s;", coords2D.c_str(), ce.radius(), imgInc);

     // Manually unroll loop because some drivers don't; yields 20-30% speedup.
     const char* kVecSuffix[4] = { ".x", ".y", ".z", ".w" };
     for (int i = 0; i < width; i++) {
         SkString index;
         SkString kernelIndex;
         index.appendS32(i/4);
         kernel.appendArrayAccess(index.c_str(), &kernelIndex);
         kernelIndex.append(kVecSuffix[i & 0x3]);

         if (ce.useBounds()) {
             // We used to compute a bool indicating whether we're in bounds or not, cast it to a
             // float, and then mul weight*texture_sample by the float. However, the Adreno 430 seems
             // to have a bug that caused corruption.
             const char* bounds = uniformHandler->getUniformCStr(fBoundsUni);
             const char* component = ce.direction() == Gr1DKernelEffect::kY_Direction ? "y" : "x";
             fragBuilder->codeAppendf("if (coord.%s >= %s.x && coord.%s <= %s.y) {",
                                      component, bounds, component, bounds);
         }
         fragBuilder->codeAppendf("\t\t%s += ", args.fOutputColor);
         fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord");
         fragBuilder->codeAppendf(" * %s;\n", kernelIndex.c_str());
         if (ce.useBounds()) {
             fragBuilder->codeAppend("}");
         }
         fragBuilder->codeAppendf("\t\tcoord += %s;\n", imgInc);
     }

     SkString modulate;
     GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
     fragBuilder->codeAppend(modulate.c_str());
 }

 void GrGLConvolutionEffect::onSetData(const GrGLSLProgramDataManager& pdman,
                                       const GrProcessor& processor) {
     const GrConvolutionEffect& conv = processor.cast<GrConvolutionEffect>();
     GrTexture& texture = *conv.textureSampler(0).texture();

     float imageIncrement[2] = { 0 };
     float ySign = texture.origin() != kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
     switch (conv.direction()) {
         case Gr1DKernelEffect::kX_Direction:
             imageIncrement[0] = 1.0f / texture.width();
             break;
         case Gr1DKernelEffect::kY_Direction:
             imageIncrement[1] = ySign / texture.height();
             break;
         default:
             SkFAIL("Unknown filter direction.");
     }
     pdman.set2fv(fImageIncrementUni, 1, imageIncrement);
     if (conv.useBounds()) {
         const float* bounds = conv.bounds();
         if (Gr1DKernelEffect::kY_Direction == conv.direction() &&
             texture.origin() != kTopLeft_GrSurfaceOrigin) {
             pdman.set2f(fBoundsUni, 1.0f - bounds[1], 1.0f - bounds[0]);
         } else {
             pdman.set2f(fBoundsUni, bounds[0], bounds[1]);
         }
     }
     int width = Gr1DKernelEffect::WidthFromRadius(conv.radius());

     int arrayCount = (width + 3) / 4;
     SkASSERT(4 * arrayCount >= width);
     pdman.set4fv(fKernelUni, arrayCount, conv.kernel());
 }

 void GrGLConvolutionEffect::GenKey(const GrProcessor& processor, const GrShaderCaps&,
                                    GrProcessorKeyBuilder* b) {
     const GrConvolutionEffect& conv = processor.cast<GrConvolutionEffect>();
     uint32_t key = conv.radius();
     key <<= 2;
     if (conv.useBounds()) {
         key |= 0x2;
         key |= GrConvolutionEffect::kY_Direction == conv.direction() ? 0x1 : 0x0;
     }
     b->add32(key);
 }

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

 GrConvolutionEffect::GrConvolutionEffect(GrTexture* texture,
                                          Direction direction,
                                          int radius,
                                          const float* kernel,
                                          bool useBounds,
                                          float bounds[2])
     : INHERITED(texture, direction, radius), fUseBounds(useBounds) {
     this->initClassID<GrConvolutionEffect>();
     SkASSERT(radius <= kMaxKernelRadius);
     SkASSERT(kernel);
     int width = this->width();
     for (int i = 0; i < width; i++) {
         fKernel[i] = kernel[i];
     }
     memcpy(fBounds, bounds, sizeof(fBounds));
 }

 GrConvolutionEffect::GrConvolutionEffect(GrTexture* texture,
                                          Direction direction,
                                          int radius,
                                          float gaussianSigma,
                                          bool useBounds,
                                          float bounds[2])
     : INHERITED(texture, direction, radius), fUseBounds(useBounds) {
     this->initClassID<GrConvolutionEffect>();
     SkASSERT(radius <= kMaxKernelRadius);
     int width = this->width();

     float sum = 0.0f;
     float denom = 1.0f / (2.0f * gaussianSigma * gaussianSigma);
     for (int i = 0; i < width; ++i) {
         float x = static_cast<float>(i - this->radius());
         // Note that the constant term (1/(sqrt(2*pi*sigma^2)) of the Gaussian
         // is dropped here, since we renormalize the kernel below.
         fKernel[i] = sk_float_exp(- x * x * denom);
         sum += fKernel[i];
     }
     // Normalize the kernel
     float scale = 1.0f / sum;
     for (int i = 0; i < width; ++i) {
         fKernel[i] *= scale;
     }
     memcpy(fBounds, bounds, sizeof(fBounds));
 }

 GrConvolutionEffect::~GrConvolutionEffect() {
 }

 void GrConvolutionEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
                                                 GrProcessorKeyBuilder* b) const {
     GrGLConvolutionEffect::GenKey(*this, caps, b);
 }

 GrGLSLFragmentProcessor* GrConvolutionEffect::onCreateGLSLInstance() const  {
     return new GrGLConvolutionEffect;
 }

 bool GrConvolutionEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
     const GrConvolutionEffect& s = sBase.cast<GrConvolutionEffect>();
     return (this->radius() == s.radius() &&
             this->direction() == s.direction() &&
             this->useBounds() == s.useBounds() &&
             0 == memcmp(fBounds, s.fBounds, sizeof(fBounds)) &&
             0 == memcmp(fKernel, s.fKernel, this->width() * sizeof(float)));
 }

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

 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrConvolutionEffect);

 sk_sp<GrFragmentProcessor> GrConvolutionEffect::TestCreate(GrProcessorTestData* d) {
     int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
                                           GrProcessorUnitTest::kAlphaTextureIdx;
     Direction dir = d->fRandom->nextBool() ? kX_Direction : kY_Direction;
     int radius = d->fRandom->nextRangeU(1, kMaxKernelRadius);
     float kernel[kMaxKernelWidth];
     for (size_t i = 0; i < SK_ARRAY_COUNT(kernel); ++i) {
         kernel[i] = d->fRandom->nextSScalar1();
     }
     float bounds[2];
     for (size_t i = 0; i < SK_ARRAY_COUNT(bounds); ++i) {
         bounds[i] = d->fRandom->nextF();
     }

     bool useBounds = d->fRandom->nextBool();
     return GrConvolutionEffect::Make(d->fTextures[texIdx],
                                      dir,
                                      radius,
                                      kernel,
                                      useBounds,
                                      bounds);
 }
	/*
	* 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 "GrConvolutionEffect.h"
	#include "glsl/GrGLSLFragmentProcessor.h"
	#include "glsl/GrGLSLFragmentShaderBuilder.h"
	#include "glsl/GrGLSLProgramDataManager.h"
	#include "glsl/GrGLSLUniformHandler.h"
	#include "../private/GrGLSL.h"

	// For brevity
	typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;

	class GrGLConvolutionEffect : public GrGLSLFragmentProcessor {
	public:
	void emitCode(EmitArgs&) override;

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

	protected:
	void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor&) override;

	private:
	UniformHandle fKernelUni;
	UniformHandle fImageIncrementUni;
	UniformHandle fBoundsUni;

	typedef GrGLSLFragmentProcessor INHERITED;
	};

	void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
	const GrConvolutionEffect& ce = args.fFp.cast<GrConvolutionEffect>();

	GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
	fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
	kVec2f_GrSLType, kDefault_GrSLPrecision,
	"ImageIncrement");
	if (ce.useBounds()) {
	fBoundsUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
	kVec2f_GrSLType, kDefault_GrSLPrecision,
	"Bounds");
	}

	int width = Gr1DKernelEffect::WidthFromRadius(ce.radius());

	int arrayCount = (width + 3) / 4;
	SkASSERT(4 * arrayCount >= width);

	fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
	kVec4f_GrSLType, kDefault_GrSLPrecision,
	"Kernel", arrayCount);

	GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
	SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);

	fragBuilder->codeAppendf("%s = vec4(0, 0, 0, 0);", args.fOutputColor);

	const GrShaderVar& kernel = uniformHandler->getUniformVariable(fKernelUni);
	const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);

	fragBuilder->codeAppendf("vec2 coord = %s - %d.0 * %s;", coords2D.c_str(), ce.radius(), imgInc);

	// Manually unroll loop because some drivers don't; yields 20-30% speedup.
	const char* kVecSuffix[4] = { ".x", ".y", ".z", ".w" };
	for (int i = 0; i < width; i++) {
	SkString index;
	SkString kernelIndex;
	index.appendS32(i/4);
	kernel.appendArrayAccess(index.c_str(), &kernelIndex);
	kernelIndex.append(kVecSuffix[i & 0x3]);

	if (ce.useBounds()) {
	// We used to compute a bool indicating whether we're in bounds or not, cast it to a
	// float, and then mul weight*texture_sample by the float. However, the Adreno 430 seems
	// to have a bug that caused corruption.
	const char* bounds = uniformHandler->getUniformCStr(fBoundsUni);
	const char* component = ce.direction() == Gr1DKernelEffect::kY_Direction ? "y" : "x";
	fragBuilder->codeAppendf("if (coord.%s >= %s.x && coord.%s <= %s.y) {",
	component, bounds, component, bounds);
	}
	fragBuilder->codeAppendf("\t\t%s += ", args.fOutputColor);
	fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord");
	fragBuilder->codeAppendf(" * %s;\n", kernelIndex.c_str());
	if (ce.useBounds()) {
	fragBuilder->codeAppend("}");
	}
	fragBuilder->codeAppendf("\t\tcoord += %s;\n", imgInc);
	}

	SkString modulate;
	GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
	fragBuilder->codeAppend(modulate.c_str());
	}

	void GrGLConvolutionEffect::onSetData(const GrGLSLProgramDataManager& pdman,
	const GrProcessor& processor) {
	const GrConvolutionEffect& conv = processor.cast<GrConvolutionEffect>();
	GrTexture& texture = *conv.textureSampler(0).texture();

	float imageIncrement[2] = { 0 };
	float ySign = texture.origin() != kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
	switch (conv.direction()) {
	case Gr1DKernelEffect::kX_Direction:
	imageIncrement[0] = 1.0f / texture.width();
	break;
	case Gr1DKernelEffect::kY_Direction:
	imageIncrement[1] = ySign / texture.height();
	break;
	default:
	SkFAIL("Unknown filter direction.");
	}
	pdman.set2fv(fImageIncrementUni, 1, imageIncrement);
	if (conv.useBounds()) {
	const float* bounds = conv.bounds();
	if (Gr1DKernelEffect::kY_Direction == conv.direction() &&
	texture.origin() != kTopLeft_GrSurfaceOrigin) {
	pdman.set2f(fBoundsUni, 1.0f - bounds[1], 1.0f - bounds[0]);
	} else {
	pdman.set2f(fBoundsUni, bounds[0], bounds[1]);
	}
	}
	int width = Gr1DKernelEffect::WidthFromRadius(conv.radius());

	int arrayCount = (width + 3) / 4;
	SkASSERT(4 * arrayCount >= width);
	pdman.set4fv(fKernelUni, arrayCount, conv.kernel());
	}

	void GrGLConvolutionEffect::GenKey(const GrProcessor& processor, const GrShaderCaps&,
	GrProcessorKeyBuilder* b) {
	const GrConvolutionEffect& conv = processor.cast<GrConvolutionEffect>();
	uint32_t key = conv.radius();
	key <<= 2;
	if (conv.useBounds()) {
	key \|= 0x2;
	key \|= GrConvolutionEffect::kY_Direction == conv.direction() ? 0x1 : 0x0;
	}
	b->add32(key);
	}

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

	GrConvolutionEffect::GrConvolutionEffect(GrTexture* texture,
	Direction direction,
	int radius,
	const float* kernel,
	bool useBounds,
	float bounds[2])
	: INHERITED(texture, direction, radius), fUseBounds(useBounds) {
	this->initClassID<GrConvolutionEffect>();
	SkASSERT(radius <= kMaxKernelRadius);
	SkASSERT(kernel);
	int width = this->width();
	for (int i = 0; i < width; i++) {
	fKernel[i] = kernel[i];
	}
	memcpy(fBounds, bounds, sizeof(fBounds));
	}

	GrConvolutionEffect::GrConvolutionEffect(GrTexture* texture,
	Direction direction,
	int radius,
	float gaussianSigma,
	bool useBounds,
	float bounds[2])
	: INHERITED(texture, direction, radius), fUseBounds(useBounds) {
	this->initClassID<GrConvolutionEffect>();
	SkASSERT(radius <= kMaxKernelRadius);
	int width = this->width();

	float sum = 0.0f;
	float denom = 1.0f / (2.0f * gaussianSigma * gaussianSigma);
	for (int i = 0; i < width; ++i) {
	float x = static_cast<float>(i - this->radius());
	// Note that the constant term (1/(sqrt(2pisigma^2)) of the Gaussian
	// is dropped here, since we renormalize the kernel below.
	fKernel[i] = sk_float_exp(- x * x * denom);
	sum += fKernel[i];
	}
	// Normalize the kernel
	float scale = 1.0f / sum;
	for (int i = 0; i < width; ++i) {
	fKernel[i] *= scale;
	}
	memcpy(fBounds, bounds, sizeof(fBounds));
	}

	GrConvolutionEffect::~GrConvolutionEffect() {
	}

	void GrConvolutionEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
	GrProcessorKeyBuilder* b) const {
	GrGLConvolutionEffect::GenKey(*this, caps, b);
	}

	GrGLSLFragmentProcessor* GrConvolutionEffect::onCreateGLSLInstance() const {
	return new GrGLConvolutionEffect;
	}

	bool GrConvolutionEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
	const GrConvolutionEffect& s = sBase.cast<GrConvolutionEffect>();
	return (this->radius() == s.radius() &&
	this->direction() == s.direction() &&
	this->useBounds() == s.useBounds() &&
	0 == memcmp(fBounds, s.fBounds, sizeof(fBounds)) &&
	0 == memcmp(fKernel, s.fKernel, this->width() * sizeof(float)));
	}

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

	GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrConvolutionEffect);

	sk_sp<GrFragmentProcessor> GrConvolutionEffect::TestCreate(GrProcessorTestData* d) {
	int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
	GrProcessorUnitTest::kAlphaTextureIdx;
	Direction dir = d->fRandom->nextBool() ? kX_Direction : kY_Direction;
	int radius = d->fRandom->nextRangeU(1, kMaxKernelRadius);
	float kernel[kMaxKernelWidth];
	for (size_t i = 0; i < SK_ARRAY_COUNT(kernel); ++i) {
	kernel[i] = d->fRandom->nextSScalar1();
	}
	float bounds[2];
	for (size_t i = 0; i < SK_ARRAY_COUNT(bounds); ++i) {
	bounds[i] = d->fRandom->nextF();
	}

	bool useBounds = d->fRandom->nextBool();
	return GrConvolutionEffect::Make(d->fTextures[texIdx],
	dir,
	radius,
	kernel,
	useBounds,
	bounds);
	}