/*
* 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 "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProgramDataManager.h"
#include "glsl/GrGLSLUniformHandler.h"
class GrGLMatrixConvolutionEffect : public GrGLSLFragmentProcessor {
public:
void emitCode(EmitArgs&) override;
static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*);
protected:
void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override;
private:
typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;
UniformHandle fKernelUni;
UniformHandle fImageIncrementUni;
UniformHandle fKernelOffsetUni;
UniformHandle fGainUni;
UniformHandle fBiasUni;
GrTextureDomain::GLDomain fDomain;
typedef GrGLSLFragmentProcessor INHERITED;
};
void GrGLMatrixConvolutionEffect::emitCode(EmitArgs& args) {
const GrMatrixConvolutionEffect& mce = args.fFp.cast<GrMatrixConvolutionEffect>();
const GrTextureDomain& domain = mce.domain();
int kWidth = mce.kernelSize().width();
int kHeight = mce.kernelSize().height();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"ImageIncrement");
fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"Kernel",
kWidth * kHeight);
fKernelOffsetUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"KernelOffset");
fGainUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision, "Gain");
fBiasUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision, "Bias");
const char* kernelOffset = uniformHandler->getUniformCStr(fKernelOffsetUni);
const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);
const char* kernel = uniformHandler->getUniformCStr(fKernelUni);
const char* gain = uniformHandler->getUniformCStr(fGainUni);
const char* bias = uniformHandler->getUniformCStr(fBiasUni);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
fragBuilder->codeAppend("vec4 sum = vec4(0, 0, 0, 0);");
fragBuilder->codeAppendf("vec2 coord = %s - %s * %s;", coords2D.c_str(), kernelOffset, imgInc);
fragBuilder->codeAppend("vec4 c;");
for (int y = 0; y < kHeight; y++) {
for (int x = 0; x < kWidth; x++) {
GrGLSLShaderBuilder::ShaderBlock block(fragBuilder);
fragBuilder->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(fragBuilder,
uniformHandler,
args.fGLSLCaps,
domain,
"c",
coord,
args.fSamplers[0]);
if (!mce.convolveAlpha()) {
fragBuilder->codeAppend("c.rgb /= c.a;");
fragBuilder->codeAppend("c.rgb = clamp(c.rgb, 0.0, 1.0);");
}
fragBuilder->codeAppend("sum += c * k;");
}
}
if (mce.convolveAlpha()) {
fragBuilder->codeAppendf("%s = sum * %s + %s;", args.fOutputColor, gain, bias);
fragBuilder->codeAppendf("%s.rgb = clamp(%s.rgb, 0.0, %s.a);",
args.fOutputColor, args.fOutputColor, args.fOutputColor);
} else {
fDomain.sampleTexture(fragBuilder,
uniformHandler,
args.fGLSLCaps,
domain,
"c",
coords2D,
args.fSamplers[0]);
fragBuilder->codeAppendf("%s.a = c.a;", args.fOutputColor);
fragBuilder->codeAppendf("%s.rgb = sum.rgb * %s + %s;", args.fOutputColor, gain, bias);
fragBuilder->codeAppendf("%s.rgb *= %s.a;", args.fOutputColor, args.fOutputColor);
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
fragBuilder->codeAppend(modulate.c_str());
}
void GrGLMatrixConvolutionEffect::GenKey(const GrProcessor& processor,
const GrGLSLCaps&, 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::onSetData(const GrGLSLProgramDataManager& pdman,
const GrProcessor& processor) {
const GrMatrixConvolutionEffect& conv = processor.cast<GrMatrixConvolutionEffect>();
GrTexture& texture = *conv.texture(0);
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, conv.kernelSize().width() * conv.kernelSize().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());
}
void GrMatrixConvolutionEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
GrProcessorKeyBuilder* b) const {
GrGLMatrixConvolutionEffect::GenKey(*this, caps, b);
}
GrGLSLFragmentProcessor* GrMatrixConvolutionEffect::onCreateGLSLInstance() const {
return new GrGLMatrixConvolutionEffect;
}
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 new GrMatrixConvolutionEffect(texture, bounds, kernelSize, kernel, gain, bias,
kernelOffset, tileMode, convolveAlpha);
}
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMatrixConvolutionEffect);
const GrFragmentProcessor* GrMatrixConvolutionEffect::TestCreate(GrProcessorTestData* d) {
int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
GrProcessorUnitTest::kAlphaTextureIdx;
int width = d->fRandom->nextRangeU(1, MAX_KERNEL_SIZE);
int height = d->fRandom->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] = d->fRandom->nextSScalar1();
}
SkScalar gain = d->fRandom->nextSScalar1();
SkScalar bias = d->fRandom->nextSScalar1();
SkIPoint kernelOffset = SkIPoint::Make(d->fRandom->nextRangeU(0, kernelSize.width()),
d->fRandom->nextRangeU(0, kernelSize.height()));
SkIRect bounds = SkIRect::MakeXYWH(d->fRandom->nextRangeU(0, d->fTextures[texIdx]->width()),
d->fRandom->nextRangeU(0, d->fTextures[texIdx]->height()),
d->fRandom->nextRangeU(0, d->fTextures[texIdx]->width()),
d->fRandom->nextRangeU(0, d->fTextures[texIdx]->height()));
GrTextureDomain::Mode tileMode =
static_cast<GrTextureDomain::Mode>(d->fRandom->nextRangeU(0, 2));
bool convolveAlpha = d->fRandom->nextBool();
return GrMatrixConvolutionEffect::Create(d->fTextures[texIdx],
bounds,
kernelSize,
kernel.get(),
gain,
bias,
kernelOffset,
tileMode,
convolveAlpha);
}