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/*
* 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 "gl/GrGLXferProcessor.h"
#include "GrXferProcessor.h"
#include "gl/builders/GrGLFragmentShaderBuilder.h"
#include "gl/builders/GrGLProgramBuilder.h"
void GrGLXferProcessor::emitCode(const EmitArgs& args) {
if (args.fXP.getDstCopyTexture()) {
GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
const char* dstColor = fsBuilder->dstColor();
const char* dstCopyTopLeftName;
const char* dstCopyCoordScaleName;
fDstCopyTopLeftUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kVec2f_GrSLType,
kDefault_GrSLPrecision,
"DstCopyUpperLeft",
&dstCopyTopLeftName);
fDstCopyScaleUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kVec2f_GrSLType,
kDefault_GrSLPrecision,
"DstCopyCoordScale",
&dstCopyCoordScaleName);
const char* fragPos = fsBuilder->fragmentPosition();
fsBuilder->codeAppend("// Read color from copy of the destination.\n");
fsBuilder->codeAppendf("vec2 _dstTexCoord = (%s.xy - %s) * %s;",
fragPos, dstCopyTopLeftName, dstCopyCoordScaleName);
fsBuilder->codeAppendf("vec4 %s = ", dstColor);
fsBuilder->appendTextureLookup(args.fSamplers[0], "_dstTexCoord", kVec2f_GrSLType);
fsBuilder->codeAppend(";");
}
this->onEmitCode(args);
}
void GrGLXferProcessor::setData(const GrGLProgramDataManager& pdm, const GrXferProcessor& xp) {
if (xp.getDstCopyTexture()) {
if (fDstCopyTopLeftUni.isValid()) {
pdm.set2f(fDstCopyTopLeftUni, static_cast<GrGLfloat>(xp.dstCopyTextureOffset().fX),
static_cast<GrGLfloat>(xp.dstCopyTextureOffset().fY));
pdm.set2f(fDstCopyScaleUni, 1.f / xp.getDstCopyTexture()->width(),
1.f / xp.getDstCopyTexture()->height());
} else {
SkASSERT(!fDstCopyScaleUni.isValid());
}
} else {
SkASSERT(!fDstCopyTopLeftUni.isValid());
SkASSERT(!fDstCopyScaleUni.isValid());
}
this->onSetData(pdm, xp);
}
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