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/*
* 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 "gl/GrGLEffect.h"
#include "gl/GrGLSL.h"
#include "gl/GrGLTexture.h"
#include "GrTBackendEffectFactory.h"
// For brevity
typedef GrGLUniformManager::UniformHandle UniformHandle;
class GrGLConvolutionEffect : public GrGLEffect {
public:
GrGLConvolutionEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
virtual void emitCode(GrGLShaderBuilder*,
const GrDrawEffect&,
EffectKey,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray&,
const TextureSamplerArray&) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager& uman, const GrDrawEffect&) SK_OVERRIDE;
static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
private:
int width() const { return Gr1DKernelEffect::WidthFromRadius(fRadius); }
bool useBounds() const { return fUseBounds; }
Gr1DKernelEffect::Direction direction() const { return fDirection; }
int fRadius;
bool fUseBounds;
Gr1DKernelEffect::Direction fDirection;
UniformHandle fKernelUni;
UniformHandle fImageIncrementUni;
UniformHandle fBoundsUni;
typedef GrGLEffect INHERITED;
};
GrGLConvolutionEffect::GrGLConvolutionEffect(const GrBackendEffectFactory& factory,
const GrDrawEffect& drawEffect)
: INHERITED(factory) {
const GrConvolutionEffect& c = drawEffect.castEffect<GrConvolutionEffect>();
fRadius = c.radius();
fUseBounds = c.useBounds();
fDirection = c.direction();
}
void GrGLConvolutionEffect::emitCode(GrGLShaderBuilder* builder,
const GrDrawEffect&,
EffectKey key,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray& coords,
const TextureSamplerArray& samplers) {
SkString coords2D = builder->ensureFSCoords2D(coords, 0);
fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
kVec2f_GrSLType, "ImageIncrement");
if (this->useBounds()) {
fBoundsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
kVec2f_GrSLType, "Bounds");
}
fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility,
kFloat_GrSLType, "Kernel", this->width());
builder->fsCodeAppendf("\t\t%s = vec4(0, 0, 0, 0);\n", outputColor);
int width = this->width();
const GrGLShaderVar& kernel = builder->getUniformVariable(fKernelUni);
const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
builder->fsCodeAppendf("\t\tvec2 coord = %s - %d.0 * %s;\n", coords2D.c_str(), fRadius, imgInc);
// Manually unroll loop because some drivers don't; yields 20-30% speedup.
for (int i = 0; i < width; i++) {
SkString index;
SkString kernelIndex;
index.appendS32(i);
kernel.appendArrayAccess(index.c_str(), &kernelIndex);
builder->fsCodeAppendf("\t\t%s += ", outputColor);
builder->fsAppendTextureLookup(samplers[0], "coord");
if (this->useBounds()) {
const char* bounds = builder->getUniformCStr(fBoundsUni);
const char* component = this->direction() == Gr1DKernelEffect::kY_Direction ? "y" : "x";
builder->fsCodeAppendf(" * float(coord.%s >= %s.x && coord.%s <= %s.y)",
component, bounds, component, bounds);
}
builder->fsCodeAppendf(" * %s;\n", kernelIndex.c_str());
builder->fsCodeAppendf("\t\tcoord += %s;\n", imgInc);
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
builder->fsCodeAppend(modulate.c_str());
}
void GrGLConvolutionEffect::setData(const GrGLUniformManager& uman,
const GrDrawEffect& drawEffect) {
const GrConvolutionEffect& conv = drawEffect.castEffect<GrConvolutionEffect>();
GrTexture& texture = *conv.texture(0);
// the code we generated was for a specific kernel radius
SkASSERT(conv.radius() == fRadius);
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.");
}
uman.set2fv(fImageIncrementUni, 1, imageIncrement);
if (conv.useBounds()) {
const float* bounds = conv.bounds();
if (Gr1DKernelEffect::kY_Direction == conv.direction() &&
texture.origin() != kTopLeft_GrSurfaceOrigin) {
uman.set2f(fBoundsUni, 1.0f - bounds[1], 1.0f - bounds[0]);
} else {
uman.set2f(fBoundsUni, bounds[0], bounds[1]);
}
}
uman.set1fv(fKernelUni, this->width(), conv.kernel());
}
GrGLEffect::EffectKey GrGLConvolutionEffect::GenKey(const GrDrawEffect& drawEffect,
const GrGLCaps&) {
const GrConvolutionEffect& conv = drawEffect.castEffect<GrConvolutionEffect>();
EffectKey key = conv.radius();
key <<= 2;
if (conv.useBounds()) {
key |= 0x2;
key |= GrConvolutionEffect::kY_Direction == conv.direction() ? 0x1 : 0x0;
}
return key;
}
///////////////////////////////////////////////////////////////////////////////
GrConvolutionEffect::GrConvolutionEffect(GrTexture* texture,
Direction direction,
int radius,
const float* kernel,
bool useBounds,
float bounds[2])
: Gr1DKernelEffect(texture, direction, radius), fUseBounds(useBounds) {
SkASSERT(radius <= kMaxKernelRadius);
SkASSERT(NULL != 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])
: Gr1DKernelEffect(texture, direction, radius), fUseBounds(useBounds) {
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() {
}
const GrBackendEffectFactory& GrConvolutionEffect::getFactory() const {
return GrTBackendEffectFactory<GrConvolutionEffect>::getInstance();
}
bool GrConvolutionEffect::onIsEqual(const GrEffect& sBase) const {
const GrConvolutionEffect& s = CastEffect<GrConvolutionEffect>(sBase);
return (this->texture(0) == s.texture(0) &&
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_EFFECT_TEST(GrConvolutionEffect);
GrEffectRef* GrConvolutionEffect::TestCreate(SkRandom* random,
GrContext*,
const GrDrawTargetCaps&,
GrTexture* textures[]) {
int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
GrEffectUnitTest::kAlphaTextureIdx;
Direction dir = random->nextBool() ? kX_Direction : kY_Direction;
int radius = random->nextRangeU(1, kMaxKernelRadius);
float kernel[kMaxKernelWidth];
for (size_t i = 0; i < SK_ARRAY_COUNT(kernel); ++i) {
kernel[i] = random->nextSScalar1();
}
float bounds[2];
for (size_t i = 0; i < SK_ARRAY_COUNT(bounds); ++i) {
bounds[i] = random->nextF();
}
bool useBounds = random->nextBool();
return GrConvolutionEffect::Create(textures[texIdx],
dir,
radius,
kernel,
useBounds,
bounds);
}
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