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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 "GrColorTableEffect.h"
#include "gl/GrGLProgramStage.h"
#include "GrProgramStageFactory.h"
#include "SkString.h"
///////////////////////////////////////////////////////////////////////////////
class GrGLColorTableEffect : public GrGLProgramStage {
public:
GrGLColorTableEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage);
virtual void setupVariables(GrGLShaderBuilder* state) SK_OVERRIDE {}
virtual void emitVS(GrGLShaderBuilder* state,
const char* vertexCoords) SK_OVERRIDE {}
virtual void emitFS(GrGLShaderBuilder* state,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray&) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&,
const GrCustomStage&,
const GrRenderTarget*,
int stageNum) SK_OVERRIDE {}
static StageKey GenKey(const GrCustomStage&, const GrGLCaps&);
private:
typedef GrGLProgramStage INHERITED;
};
GrGLColorTableEffect::GrGLColorTableEffect(
const GrProgramStageFactory& factory, const GrCustomStage& stage)
: INHERITED(factory) {
}
void GrGLColorTableEffect::emitFS(GrGLShaderBuilder* builder,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray& samplers) {
static const float kColorScaleFactor = 255.0f / 256.0f;
static const float kColorOffsetFactor = 1.0f / 512.0f;
SkString* code = &builder->fFSCode;
if (NULL == inputColor) {
// the input color is solid white (all ones).
static const float kMaxValue = kColorScaleFactor + kColorOffsetFactor;
code->appendf("\t\tvec4 coord = vec4(%f, %f, %f, %f);\n",
kMaxValue, kMaxValue, kMaxValue, kMaxValue);
} else {
code->appendf("\t\tvec4 coord = vec4(%s.rgb / %s.a, %s.a);\n",
inputColor, inputColor, inputColor);
code->appendf("\t\tcoord = coord * %f + vec4(%f, %f, %f, %f);\n",
kColorScaleFactor,
kColorOffsetFactor, kColorOffsetFactor,
kColorOffsetFactor, kColorOffsetFactor);
}
code->appendf("\t\t%s.a = ", outputColor);
builder->appendTextureLookup(code, samplers[0], "vec2(coord.a, 0.125)");
code->append(";\n");
code->appendf("\t\t%s.r = ", outputColor);
builder->appendTextureLookup(code, samplers[0], "vec2(coord.r, 0.375)");
code->append(";\n");
code->appendf("\t\t%s.g = ", outputColor);
builder->appendTextureLookup(code, samplers[0], "vec2(coord.g, 0.625)");
code->append(";\n");
code->appendf("\t\t%s.b = ", outputColor);
builder->appendTextureLookup(code, samplers[0], "vec2(coord.b, 0.875)");
code->append(";\n");
code->appendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
}
GrGLProgramStage::StageKey GrGLColorTableEffect::GenKey(const GrCustomStage& s,
const GrGLCaps& caps) {
return 0;
}
///////////////////////////////////////////////////////////////////////////////
GrColorTableEffect::GrColorTableEffect(GrTexture* texture)
: INHERITED(1)
, fTextureAccess(texture, "a") {
}
GrColorTableEffect::~GrColorTableEffect() {
}
const GrProgramStageFactory& GrColorTableEffect::getFactory() const {
return GrTProgramStageFactory<GrColorTableEffect>::getInstance();
}
bool GrColorTableEffect::isEqual(const GrCustomStage& sBase) const {
return INHERITED::isEqual(sBase);
}
const GrTextureAccess& GrColorTableEffect::textureAccess(int index) const {
GrAssert(0 == index);
return fTextureAccess;
}
///////////////////////////////////////////////////////////////////////////////
GR_DEFINE_CUSTOM_STAGE_TEST(GrColorTableEffect);
GrCustomStage* GrColorTableEffect::TestCreate(SkRandom* random,
GrContext* context,
GrTexture* textures[]) {
return SkNEW_ARGS(GrColorTableEffect, (textures[GrCustomStageUnitTest::kAlphaTextureIdx]));
}
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