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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrCustomCoordsTextureEffect.h"
#include "GrInvariantOutput.h"
#include "gl/builders/GrGLProgramBuilder.h"
#include "gl/GrGLProcessor.h"
#include "gl/GrGLSL.h"
#include "gl/GrGLTexture.h"
#include "gl/GrGLGeometryProcessor.h"
#include "GrTBackendProcessorFactory.h"
#include "GrTexture.h"
class GrGLCustomCoordsTextureEffect : public GrGLGeometryProcessor {
public:
GrGLCustomCoordsTextureEffect(const GrBackendProcessorFactory& factory, const GrProcessor&)
: INHERITED (factory) {}
virtual void emitCode(const EmitArgs& args) SK_OVERRIDE {
const GrCustomCoordsTextureEffect& customCoordsTextureEffect =
args.fGP.cast<GrCustomCoordsTextureEffect>();
SkASSERT(1 == customCoordsTextureEffect.getVertexAttribs().count());
GrGLVertToFrag v(kVec2f_GrSLType);
args.fPB->addVarying("TextureCoords", &v);
GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
const GrShaderVar& inTextureCoords = customCoordsTextureEffect.inTextureCoords();
vsBuilder->codeAppendf("%s = %s;", v.vsOut(), inTextureCoords.c_str());
// setup position varying
vsBuilder->codeAppendf("%s = %s * vec3(%s, 1);", vsBuilder->glPosition(),
vsBuilder->uViewM(), vsBuilder->inPosition());
GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
fsBuilder->codeAppendf("%s = ", args.fOutput);
fsBuilder->appendTextureLookupAndModulate(args.fInput,
args.fSamplers[0],
v.fsIn(),
kVec2f_GrSLType);
fsBuilder->codeAppend(";");
}
virtual void setData(const GrGLProgramDataManager&,
const GrProcessor&) SK_OVERRIDE {}
private:
typedef GrGLGeometryProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
GrCustomCoordsTextureEffect::GrCustomCoordsTextureEffect(GrTexture* texture,
const GrTextureParams& params)
: fTextureAccess(texture, params)
, fInTextureCoords(this->addVertexAttrib(GrShaderVar("inTextureCoords",
kVec2f_GrSLType,
GrShaderVar::kAttribute_TypeModifier))) {
this->addTextureAccess(&fTextureAccess);
}
bool GrCustomCoordsTextureEffect::onIsEqual(const GrGeometryProcessor& other) const {
return true;
}
void GrCustomCoordsTextureEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
if (GrPixelConfigIsAlphaOnly(this->texture(0)->config())) {
inout->mulByUnknownAlpha();
} else if (GrPixelConfigIsOpaque(this->texture(0)->config())) {
inout->mulByUnknownOpaqueColor();
} else {
inout->mulByUnknownColor();
}
}
const GrBackendGeometryProcessorFactory& GrCustomCoordsTextureEffect::getFactory() const {
return GrTBackendGeometryProcessorFactory<GrCustomCoordsTextureEffect>::getInstance();
}
///////////////////////////////////////////////////////////////////////////////
GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrCustomCoordsTextureEffect);
GrGeometryProcessor* GrCustomCoordsTextureEffect::TestCreate(SkRandom* random,
GrContext*,
const GrDrawTargetCaps&,
GrTexture* textures[]) {
int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
GrProcessorUnitTest::kAlphaTextureIdx;
static const SkShader::TileMode kTileModes[] = {
SkShader::kClamp_TileMode,
SkShader::kRepeat_TileMode,
SkShader::kMirror_TileMode,
};
SkShader::TileMode tileModes[] = {
kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
};
GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode :
GrTextureParams::kNone_FilterMode);
return GrCustomCoordsTextureEffect::Create(textures[texIdx], params);
}
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