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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 "GrTextureDomainEffect.h"
#include "GrTBackendEffectFactory.h"
#include "gl/GrGLEffect.h"
#include "gl/GrGLEffectMatrix.h"
#include "SkFloatingPoint.h"
class GrGLTextureDomainEffect : public GrGLEffect {
public:
GrGLTextureDomainEffect(const GrBackendEffectFactory&, const GrEffect&);
virtual void emitCode(GrGLShaderBuilder*,
const GrEffectStage&,
EffectKey,
const char* vertexCoords,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray&) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&, const GrEffectStage&) SK_OVERRIDE;
static inline EffectKey GenKey(const GrEffectStage&, const GrGLCaps&);
private:
GrGLUniformManager::UniformHandle fNameUni;
GrGLEffectMatrix fEffectMatrix;
GrGLfloat fPrevDomain[4];
typedef GrGLEffect INHERITED;
};
GrGLTextureDomainEffect::GrGLTextureDomainEffect(const GrBackendEffectFactory& factory,
const GrEffect&)
: INHERITED(factory)
, fNameUni(GrGLUniformManager::kInvalidUniformHandle) {
fPrevDomain[0] = SK_FloatNaN;
}
void GrGLTextureDomainEffect::emitCode(GrGLShaderBuilder* builder,
const GrEffectStage&,
EffectKey key,
const char* vertexCoords,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray& samplers) {
const char* coords;
fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, vertexCoords, &coords);
fNameUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kVec4f_GrSLType, "TexDom");
builder->fFSCode.appendf("\tvec2 clampCoord = clamp(%s, %s.xy, %s.zw);\n",
coords,
builder->getUniformCStr(fNameUni),
builder->getUniformCStr(fNameUni));
builder->fFSCode.appendf("\t%s = ", outputColor);
builder->appendTextureLookupAndModulate(&builder->fFSCode,
inputColor,
samplers[0],
"clampCoord");
builder->fFSCode.append(";\n");
}
void GrGLTextureDomainEffect::setData(const GrGLUniformManager& uman, const GrEffectStage& stage) {
const GrTextureDomainEffect& effect =
static_cast<const GrTextureDomainEffect&>(*stage.getEffect());
const GrRect& domain = effect.domain();
float values[4] = {
SkScalarToFloat(domain.left()),
SkScalarToFloat(domain.top()),
SkScalarToFloat(domain.right()),
SkScalarToFloat(domain.bottom())
};
// vertical flip if necessary
if (GrSurface::kBottomLeft_Origin == effect.texture(0)->origin()) {
values[1] = 1.0f - values[1];
values[3] = 1.0f - values[3];
// The top and bottom were just flipped, so correct the ordering
// of elements so that values = (l, t, r, b).
SkTSwap(values[1], values[3]);
}
if (0 != memcmp(values, fPrevDomain, 4 * sizeof(GrGLfloat))) {
uman.set4fv(fNameUni, 0, 1, values);
}
fEffectMatrix.setData(uman,
effect.getMatrix(),
stage.getCoordChangeMatrix(),
effect.texture(0));
}
GrGLEffect::EffectKey GrGLTextureDomainEffect::GenKey(const GrEffectStage& stage, const GrGLCaps&) {
const GrTextureDomainEffect& effect =
static_cast<const GrTextureDomainEffect&>(*stage.getEffect());
return GrGLEffectMatrix::GenKey(effect.getMatrix(), stage.getCoordChangeMatrix(), effect.texture(0));
}
///////////////////////////////////////////////////////////////////////////////
GrTextureDomainEffect::GrTextureDomainEffect(GrTexture* texture, const GrRect& domain)
: GrSingleTextureEffect(texture)
, fTextureDomain(domain) {
}
GrTextureDomainEffect::GrTextureDomainEffect(GrTexture* texture,
const GrRect& domain,
const GrTextureParams& params)
: GrSingleTextureEffect(texture, params)
, fTextureDomain(domain) {
}
GrTextureDomainEffect::~GrTextureDomainEffect() {
}
const GrBackendEffectFactory& GrTextureDomainEffect::getFactory() const {
return GrTBackendEffectFactory<GrTextureDomainEffect>::getInstance();
}
bool GrTextureDomainEffect::isEqual(const GrEffect& sBase) const {
const GrTextureDomainEffect& s = static_cast<const GrTextureDomainEffect&>(sBase);
return (INHERITED::isEqual(sBase) && this->fTextureDomain == s.fTextureDomain);
}
///////////////////////////////////////////////////////////////////////////////
GR_DEFINE_EFFECT_TEST(GrTextureDomainEffect);
GrEffect* GrTextureDomainEffect::TestCreate(SkRandom* random,
GrContext* context,
GrTexture* textures[]) {
int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
GrEffectUnitTest::kAlphaTextureIdx;
GrRect domain;
domain.fLeft = random->nextUScalar1();
domain.fRight = random->nextRangeScalar(domain.fLeft, SK_Scalar1);
domain.fTop = random->nextUScalar1();
domain.fBottom = random->nextRangeScalar(domain.fTop, SK_Scalar1);
return SkNEW_ARGS(GrTextureDomainEffect, (textures[texIdx], domain));
}
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