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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 "GrMatrixConvolutionEffect.h"
#include "gl/GrGLProcessor.h"
#include "gl/GrGLSL.h"
#include "gl/GrGLTexture.h"
#include "gl/builders/GrGLProgramBuilder.h"
class GrGLMatrixConvolutionEffect : public GrGLFragmentProcessor {
public:
GrGLMatrixConvolutionEffect(const GrProcessor&);
virtual void emitCode(GrGLFPBuilder*,
const GrFragmentProcessor&,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray&,
const TextureSamplerArray&) override;
static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder*);
void setData(const GrGLProgramDataManager&, const GrProcessor&) override;
private:
typedef GrGLProgramDataManager::UniformHandle UniformHandle;
SkISize fKernelSize;
bool fConvolveAlpha;
UniformHandle fKernelUni;
UniformHandle fImageIncrementUni;
UniformHandle fKernelOffsetUni;
UniformHandle fGainUni;
UniformHandle fBiasUni;
GrTextureDomain::GLDomain fDomain;
typedef GrGLFragmentProcessor INHERITED;
};
GrGLMatrixConvolutionEffect::GrGLMatrixConvolutionEffect(const GrProcessor& processor) {
const GrMatrixConvolutionEffect& m = processor.cast<GrMatrixConvolutionEffect>();
fKernelSize = m.kernelSize();
fConvolveAlpha = m.convolveAlpha();
}
void GrGLMatrixConvolutionEffect::emitCode(GrGLFPBuilder* builder,
const GrFragmentProcessor& fp,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray& coords,
const TextureSamplerArray& samplers) {
const GrTextureDomain& domain = fp.cast<GrMatrixConvolutionEffect>().domain();
fImageIncrementUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"ImageIncrement");
fKernelUni = builder->addUniformArray(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType, kDefault_GrSLPrecision,
"Kernel",
fKernelSize.width() * fKernelSize.height());
fKernelOffsetUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kVec2f_GrSLType, kDefault_GrSLPrecision, "KernelOffset");
fGainUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType, kDefault_GrSLPrecision, "Gain");
fBiasUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType, kDefault_GrSLPrecision, "Bias");
const char* kernelOffset = builder->getUniformCStr(fKernelOffsetUni);
const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
const char* kernel = builder->getUniformCStr(fKernelUni);
const char* gain = builder->getUniformCStr(fGainUni);
const char* bias = builder->getUniformCStr(fBiasUni);
int kWidth = fKernelSize.width();
int kHeight = fKernelSize.height();
GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
fsBuilder->codeAppend("vec4 sum = vec4(0, 0, 0, 0);");
fsBuilder->codeAppendf("vec2 coord = %s - %s * %s;", coords2D.c_str(), kernelOffset,
imgInc);
fsBuilder->codeAppend("vec4 c;");
for (int y = 0; y < kHeight; y++) {
for (int x = 0; x < kWidth; x++) {
GrGLShaderBuilder::ShaderBlock block(fsBuilder);
fsBuilder->codeAppendf("float k = %s[%d * %d + %d];", kernel, y, kWidth, x);
SkString coord;
coord.printf("coord + vec2(%d, %d) * %s", x, y, imgInc);
fDomain.sampleTexture(fsBuilder, domain, "c", coord, samplers[0]);
if (!fConvolveAlpha) {
fsBuilder->codeAppend("c.rgb /= c.a;");
fsBuilder->codeAppend("c.rgb = clamp(c.rgb, 0, 1);");
}
fsBuilder->codeAppend("sum += c * k;");
}
}
if (fConvolveAlpha) {
fsBuilder->codeAppendf("%s = sum * %s + %s;", outputColor, gain, bias);
fsBuilder->codeAppendf("%s.rgb = clamp(%s.rgb, 0.0, %s.a);",
outputColor, outputColor, outputColor);
} else {
fDomain.sampleTexture(fsBuilder, domain, "c", coords2D, samplers[0]);
fsBuilder->codeAppendf("%s.a = c.a;", outputColor);
fsBuilder->codeAppendf("%s.rgb = sum.rgb * %s + %s;", outputColor, gain, bias);
fsBuilder->codeAppendf("%s.rgb *= %s.a;", outputColor, outputColor);
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, outputColor, inputColor);
fsBuilder->codeAppend(modulate.c_str());
}
void GrGLMatrixConvolutionEffect::GenKey(const GrProcessor& processor,
const GrGLCaps&, GrProcessorKeyBuilder* b) {
const GrMatrixConvolutionEffect& m = processor.cast<GrMatrixConvolutionEffect>();
SkASSERT(m.kernelSize().width() <= 0x7FFF && m.kernelSize().height() <= 0xFFFF);
uint32_t key = m.kernelSize().width() << 16 | m.kernelSize().height();
key |= m.convolveAlpha() ? 1 << 31 : 0;
b->add32(key);
b->add32(GrTextureDomain::GLDomain::DomainKey(m.domain()));
}
void GrGLMatrixConvolutionEffect::setData(const GrGLProgramDataManager& pdman,
const GrProcessor& processor) {
const GrMatrixConvolutionEffect& conv = processor.cast<GrMatrixConvolutionEffect>();
GrTexture& texture = *conv.texture(0);
// the code we generated was for a specific kernel size
SkASSERT(conv.kernelSize() == fKernelSize);
float imageIncrement[2];
float ySign = texture.origin() == kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
imageIncrement[0] = 1.0f / texture.width();
imageIncrement[1] = ySign / texture.height();
pdman.set2fv(fImageIncrementUni, 1, imageIncrement);
pdman.set2fv(fKernelOffsetUni, 1, conv.kernelOffset());
pdman.set1fv(fKernelUni, fKernelSize.width() * fKernelSize.height(), conv.kernel());
pdman.set1f(fGainUni, conv.gain());
pdman.set1f(fBiasUni, conv.bias());
fDomain.setData(pdman, conv.domain(), texture.origin());
}
GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture,
const SkIRect& bounds,
const SkISize& kernelSize,
const SkScalar* kernel,
SkScalar gain,
SkScalar bias,
const SkIPoint& kernelOffset,
GrTextureDomain::Mode tileMode,
bool convolveAlpha)
: INHERITED(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture)),
fKernelSize(kernelSize),
fGain(SkScalarToFloat(gain)),
fBias(SkScalarToFloat(bias) / 255.0f),
fConvolveAlpha(convolveAlpha),
fDomain(GrTextureDomain::MakeTexelDomainForMode(texture, bounds, tileMode), tileMode) {
this->initClassID<GrMatrixConvolutionEffect>();
for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
fKernel[i] = SkScalarToFloat(kernel[i]);
}
fKernelOffset[0] = static_cast<float>(kernelOffset.x());
fKernelOffset[1] = static_cast<float>(kernelOffset.y());
}
GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() {
}
void GrMatrixConvolutionEffect::getGLProcessorKey(const GrGLCaps& caps,
GrProcessorKeyBuilder* b) const {
GrGLMatrixConvolutionEffect::GenKey(*this, caps, b);
}
GrGLFragmentProcessor* GrMatrixConvolutionEffect::createGLInstance() const {
return SkNEW_ARGS(GrGLMatrixConvolutionEffect, (*this));
}
bool GrMatrixConvolutionEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
const GrMatrixConvolutionEffect& s = sBase.cast<GrMatrixConvolutionEffect>();
return fKernelSize == s.kernelSize() &&
!memcmp(fKernel, s.kernel(),
fKernelSize.width() * fKernelSize.height() * sizeof(float)) &&
fGain == s.gain() &&
fBias == s.bias() &&
fKernelOffset == s.kernelOffset() &&
fConvolveAlpha == s.convolveAlpha() &&
fDomain == s.domain();
}
// Static function to create a 2D convolution
GrFragmentProcessor*
GrMatrixConvolutionEffect::CreateGaussian(GrTexture* texture,
const SkIRect& bounds,
const SkISize& kernelSize,
SkScalar gain,
SkScalar bias,
const SkIPoint& kernelOffset,
GrTextureDomain::Mode tileMode,
bool convolveAlpha,
SkScalar sigmaX,
SkScalar sigmaY) {
float kernel[MAX_KERNEL_SIZE];
int width = kernelSize.width();
int height = kernelSize.height();
SkASSERT(width * height <= MAX_KERNEL_SIZE);
float sum = 0.0f;
float sigmaXDenom = 1.0f / (2.0f * SkScalarToFloat(SkScalarSquare(sigmaX)));
float sigmaYDenom = 1.0f / (2.0f * SkScalarToFloat(SkScalarSquare(sigmaY)));
int xRadius = width / 2;
int yRadius = height / 2;
for (int x = 0; x < width; x++) {
float xTerm = static_cast<float>(x - xRadius);
xTerm = xTerm * xTerm * sigmaXDenom;
for (int y = 0; y < height; y++) {
float yTerm = static_cast<float>(y - yRadius);
float xyTerm = sk_float_exp(-(xTerm + yTerm * yTerm * sigmaYDenom));
// Note that the constant term (1/(sqrt(2*pi*sigma^2)) of the Gaussian
// is dropped here, since we renormalize the kernel below.
kernel[y * width + x] = xyTerm;
sum += xyTerm;
}
}
// Normalize the kernel
float scale = 1.0f / sum;
for (int i = 0; i < width * height; ++i) {
kernel[i] *= scale;
}
return SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
bounds,
kernelSize,
kernel,
gain,
bias,
kernelOffset,
tileMode,
convolveAlpha));
}
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMatrixConvolutionEffect);
GrFragmentProcessor* GrMatrixConvolutionEffect::TestCreate(SkRandom* random,
GrContext* context,
const GrDrawTargetCaps&,
GrTexture* textures[]) {
int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
GrProcessorUnitTest::kAlphaTextureIdx;
int width = random->nextRangeU(1, MAX_KERNEL_SIZE);
int height = random->nextRangeU(1, MAX_KERNEL_SIZE / width);
SkISize kernelSize = SkISize::Make(width, height);
SkAutoTDeleteArray<SkScalar> kernel(new SkScalar[width * height]);
for (int i = 0; i < width * height; i++) {
kernel.get()[i] = random->nextSScalar1();
}
SkScalar gain = random->nextSScalar1();
SkScalar bias = random->nextSScalar1();
SkIPoint kernelOffset = SkIPoint::Make(random->nextRangeU(0, kernelSize.width()),
random->nextRangeU(0, kernelSize.height()));
SkIRect bounds = SkIRect::MakeXYWH(random->nextRangeU(0, textures[texIdx]->width()),
random->nextRangeU(0, textures[texIdx]->height()),
random->nextRangeU(0, textures[texIdx]->width()),
random->nextRangeU(0, textures[texIdx]->height()));
GrTextureDomain::Mode tileMode = static_cast<GrTextureDomain::Mode>(random->nextRangeU(0, 2));
bool convolveAlpha = random->nextBool();
return GrMatrixConvolutionEffect::Create(textures[texIdx],
bounds,
kernelSize,
kernel.get(),
gain,
bias,
kernelOffset,
tileMode,
convolveAlpha);
}