src/gpu/effects/GrGaussianConvolutionFragmentProcessor.cpp - platform/external/skia - Gitiles

 /*
  * 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 "GrGaussianConvolutionFragmentProcessor.h"
 #include "GrProxyMove.h"
 #include "GrTextureProxy.h"
 #include "../private/GrGLSL.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
 #include "glsl/GrGLSLUniformHandler.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 GrGaussianConvolutionFragmentProcessor& ce =
             args.fFp.cast<GrGaussianConvolutionFragmentProcessor>();

     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("%s += ", args.fOutputColor);
         fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord");
         fragBuilder->codeAppendf(" * %s;\n", kernelIndex.c_str());
         if (ce.useBounds()) {
             fragBuilder->codeAppend("}");
         }
         fragBuilder->codeAppendf("coord += %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 GrGaussianConvolutionFragmentProcessor& conv =
             processor.cast<GrGaussianConvolutionFragmentProcessor>();
     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 int* bounds = conv.bounds();
         if (Gr1DKernelEffect::kX_Direction == conv.direction()) {
             SkScalar inv = SkScalarInvert(SkIntToScalar(texture.width()));
             pdman.set2f(fBoundsUni, inv * bounds[0], inv * bounds[1]);
         } else {
             SkScalar inv = SkScalarInvert(SkIntToScalar(texture.height()));
             if (texture.origin() != kTopLeft_GrSurfaceOrigin) {
                 pdman.set2f(fBoundsUni, 1.0f - (inv * bounds[1]), 1.0f - (inv * bounds[0]));
             } else {
                 pdman.set2f(fBoundsUni, inv * bounds[1], inv * bounds[0]);
             }
         }
     }
     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 GrGaussianConvolutionFragmentProcessor& conv =
             processor.cast<GrGaussianConvolutionFragmentProcessor>();
     uint32_t key = conv.radius();
     key <<= 2;
     if (conv.useBounds()) {
         key |= 0x2;
         key |= GrGaussianConvolutionFragmentProcessor::kY_Direction == conv.direction() ? 0x1 : 0x0;
     }
     b->add32(key);
 }

 ///////////////////////////////////////////////////////////////////////////////
 static void fill_in_1D_guassian_kernel(float* kernel, int width, float gaussianSigma, int radius) {
     const float denom = 1.0f / (2.0f * gaussianSigma * gaussianSigma);

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

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

     fill_in_1D_guassian_kernel(fKernel, this->width(), gaussianSigma, this->radius());

     memcpy(fBounds, bounds, sizeof(fBounds));
 }

 GrGaussianConvolutionFragmentProcessor::GrGaussianConvolutionFragmentProcessor(
                                                                     GrContext* context,
                                                                     sk_sp<GrTextureProxy> proxy,
                                                                     Direction direction,
                                                                     int radius,
                                                                     float gaussianSigma,
                                                                     bool useBounds,
                                                                     int bounds[2])
         : INHERITED{context,
                     ModulationFlags(proxy->config()),
                     GR_PROXY_MOVE(proxy),
                     direction,
                     radius}
         , fUseBounds(useBounds) {
     this->initClassID<GrGaussianConvolutionFragmentProcessor>();
     SkASSERT(radius <= kMaxKernelRadius);

     fill_in_1D_guassian_kernel(fKernel, this->width(), gaussianSigma, this->radius());

     memcpy(fBounds, bounds, sizeof(fBounds));
 }

 GrGaussianConvolutionFragmentProcessor::~GrGaussianConvolutionFragmentProcessor() {}

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

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

 bool GrGaussianConvolutionFragmentProcessor::onIsEqual(const GrFragmentProcessor& sBase) const {
     const GrGaussianConvolutionFragmentProcessor& s =
             sBase.cast<GrGaussianConvolutionFragmentProcessor>();
     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(GrGaussianConvolutionFragmentProcessor);

 #if GR_TEST_UTILS
 sk_sp<GrFragmentProcessor> GrGaussianConvolutionFragmentProcessor::TestCreate(
         GrProcessorTestData* d) {
     int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx
                                         : GrProcessorUnitTest::kAlphaTextureIdx;
     sk_sp<GrTextureProxy> proxy = d->textureProxy(texIdx);

     bool useBounds = d->fRandom->nextBool();
     int bounds[2];

     Direction dir;
     if (d->fRandom->nextBool()) {
         dir = kX_Direction;
         bounds[0] = d->fRandom->nextRangeU(0, proxy->width()-1);
         bounds[1] = d->fRandom->nextRangeU(bounds[0], proxy->width()-1);
     } else {
         dir = kY_Direction;
         bounds[0] = d->fRandom->nextRangeU(0, proxy->height()-1);
         bounds[1] = d->fRandom->nextRangeU(bounds[0], proxy->height()-1);
     }

     int radius = d->fRandom->nextRangeU(1, kMaxKernelRadius);
     float sigma = radius / 3.f;

     return GrGaussianConvolutionFragmentProcessor::Make(
             d->context(), d->textureProxy(texIdx), dir, radius, sigma, useBounds, bounds);
 }
 #endif
	/*
	* 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 "GrGaussianConvolutionFragmentProcessor.h"
	#include "GrProxyMove.h"
	#include "GrTextureProxy.h"
	#include "../private/GrGLSL.h"
	#include "glsl/GrGLSLFragmentProcessor.h"
	#include "glsl/GrGLSLFragmentShaderBuilder.h"
	#include "glsl/GrGLSLProgramDataManager.h"
	#include "glsl/GrGLSLUniformHandler.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 GrGaussianConvolutionFragmentProcessor& ce =
	args.fFp.cast<GrGaussianConvolutionFragmentProcessor>();

	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("%s += ", args.fOutputColor);
	fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord");
	fragBuilder->codeAppendf(" * %s;\n", kernelIndex.c_str());
	if (ce.useBounds()) {
	fragBuilder->codeAppend("}");
	}
	fragBuilder->codeAppendf("coord += %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 GrGaussianConvolutionFragmentProcessor& conv =
	processor.cast<GrGaussianConvolutionFragmentProcessor>();
	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 int* bounds = conv.bounds();
	if (Gr1DKernelEffect::kX_Direction == conv.direction()) {
	SkScalar inv = SkScalarInvert(SkIntToScalar(texture.width()));
	pdman.set2f(fBoundsUni, inv * bounds[0], inv * bounds[1]);
	} else {
	SkScalar inv = SkScalarInvert(SkIntToScalar(texture.height()));
	if (texture.origin() != kTopLeft_GrSurfaceOrigin) {
	pdman.set2f(fBoundsUni, 1.0f - (inv * bounds[1]), 1.0f - (inv * bounds[0]));
	} else {
	pdman.set2f(fBoundsUni, inv * bounds[1], inv * bounds[0]);
	}
	}
	}
	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 GrGaussianConvolutionFragmentProcessor& conv =
	processor.cast<GrGaussianConvolutionFragmentProcessor>();
	uint32_t key = conv.radius();
	key <<= 2;
	if (conv.useBounds()) {
	key \|= 0x2;
	key \|= GrGaussianConvolutionFragmentProcessor::kY_Direction == conv.direction() ? 0x1 : 0x0;
	}
	b->add32(key);
	}

	///////////////////////////////////////////////////////////////////////////////
	static void fill_in_1D_guassian_kernel(float* kernel, int width, float gaussianSigma, int radius) {
	const float denom = 1.0f / (2.0f * gaussianSigma * gaussianSigma);

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

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

	fill_in_1D_guassian_kernel(fKernel, this->width(), gaussianSigma, this->radius());

	memcpy(fBounds, bounds, sizeof(fBounds));
	}

	GrGaussianConvolutionFragmentProcessor::GrGaussianConvolutionFragmentProcessor(
	GrContext* context,
	sk_sp<GrTextureProxy> proxy,
	Direction direction,
	int radius,
	float gaussianSigma,
	bool useBounds,
	int bounds[2])
	: INHERITED{context,
	ModulationFlags(proxy->config()),
	GR_PROXY_MOVE(proxy),
	direction,
	radius}
	, fUseBounds(useBounds) {
	this->initClassID<GrGaussianConvolutionFragmentProcessor>();
	SkASSERT(radius <= kMaxKernelRadius);

	fill_in_1D_guassian_kernel(fKernel, this->width(), gaussianSigma, this->radius());

	memcpy(fBounds, bounds, sizeof(fBounds));
	}

	GrGaussianConvolutionFragmentProcessor::~GrGaussianConvolutionFragmentProcessor() {}

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

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

	bool GrGaussianConvolutionFragmentProcessor::onIsEqual(const GrFragmentProcessor& sBase) const {
	const GrGaussianConvolutionFragmentProcessor& s =
	sBase.cast<GrGaussianConvolutionFragmentProcessor>();
	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(GrGaussianConvolutionFragmentProcessor);

	#if GR_TEST_UTILS
	sk_sp<GrFragmentProcessor> GrGaussianConvolutionFragmentProcessor::TestCreate(
	GrProcessorTestData* d) {
	int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx
	: GrProcessorUnitTest::kAlphaTextureIdx;
	sk_sp<GrTextureProxy> proxy = d->textureProxy(texIdx);

	bool useBounds = d->fRandom->nextBool();
	int bounds[2];

	Direction dir;
	if (d->fRandom->nextBool()) {
	dir = kX_Direction;
	bounds[0] = d->fRandom->nextRangeU(0, proxy->width()-1);
	bounds[1] = d->fRandom->nextRangeU(bounds[0], proxy->width()-1);
	} else {
	dir = kY_Direction;
	bounds[0] = d->fRandom->nextRangeU(0, proxy->height()-1);
	bounds[1] = d->fRandom->nextRangeU(bounds[0], proxy->height()-1);
	}

	int radius = d->fRandom->nextRangeU(1, kMaxKernelRadius);
	float sigma = radius / 3.f;

	return GrGaussianConvolutionFragmentProcessor::Make(
	d->context(), d->textureProxy(texIdx), dir, radius, sigma, useBounds, bounds);
	}
	#endif