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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 "GrGLFragmentOnlyProgramBuilder.h"
#include "../GrGpuGL.h"
GrGLFragmentOnlyProgramBuilder::GrGLFragmentOnlyProgramBuilder(GrGpuGL* gpu,
const GrOptDrawState& optState,
const GrGLProgramDesc& desc)
: INHERITED(gpu, optState, desc) {
SkASSERT(desc.getHeader().fUseFragShaderOnly);
SkASSERT(gpu->glCaps().pathRenderingSupport());
SkASSERT(GrGLProgramDesc::kAttribute_ColorInput != desc.getHeader().fColorInput);
SkASSERT(GrGLProgramDesc::kAttribute_ColorInput != desc.getHeader().fCoverageInput);
}
int GrGLFragmentOnlyProgramBuilder::addTexCoordSets(int count) {
int firstFreeCoordSet = fTexCoordSetCnt;
fTexCoordSetCnt += count;
SkASSERT(gpu()->glCaps().maxFixedFunctionTextureCoords() >= fTexCoordSetCnt);
return firstFreeCoordSet;
}
void
GrGLFragmentOnlyProgramBuilder::createAndEmitEffects(const GrGeometryStage* geometryProcessor,
const GrFragmentStage* colorStages[],
const GrFragmentStage* coverageStages[],
GrGLSLExpr4* inputColor,
GrGLSLExpr4* inputCoverage) {
///////////////////////////////////////////////////////////////////////////
// emit the per-effect code for both color and coverage effects
EffectKeyProvider colorKeyProvider(&this->desc(), EffectKeyProvider::kColor_EffectType);
fColorEffects.reset(this->onCreateAndEmitEffects(colorStages,
this->desc().numColorEffects(),
colorKeyProvider,
inputColor));
EffectKeyProvider coverageKeyProvider(&this->desc(), EffectKeyProvider::kCoverage_EffectType);
fCoverageEffects.reset(this->onCreateAndEmitEffects(coverageStages,
this->desc().numCoverageEffects(),
coverageKeyProvider,
inputCoverage));
}
GrGLProgramEffects* GrGLFragmentOnlyProgramBuilder::onCreateAndEmitEffects(
const GrFragmentStage* effectStages[], int effectCnt,
const GrGLProgramDesc::EffectKeyProvider& keyProvider, GrGLSLExpr4* inOutFSColor) {
fProgramEffects.reset(SkNEW_ARGS(GrGLPathTexGenProgramEffects, (effectCnt)));
this->INHERITED::createAndEmitEffects(effectStages,
effectCnt,
keyProvider,
inOutFSColor);
return fProgramEffects.detach();
}
void GrGLFragmentOnlyProgramBuilder::emitEffect(const GrProcessorStage& stage,
const GrProcessorKey& key,
const char* outColor,
const char* inColor,
int stageIndex) {
SkASSERT(fProgramEffects.get());
const GrProcessor& effect = *stage.getProcessor();
SkSTArray<2, GrGLProcessor::TransformedCoords> coords(effect.numTransforms());
SkSTArray<4, GrGLProcessor::TextureSampler> samplers(effect.numTextures());
this->setupPathTexGen(stage, &coords);
this->emitSamplers(effect, &samplers);
SkASSERT(fEffectEmitter);
GrGLProcessor* glEffect = fEffectEmitter->createGLInstance();
fProgramEffects->addEffect(glEffect);
GrGLFragmentShaderBuilder* fsBuilder = this->getFragmentShaderBuilder();
// Enclose custom code in a block to avoid namespace conflicts
SkString openBrace;
openBrace.printf("\t{ // Stage %d: %s\n", stageIndex, glEffect->name());
fsBuilder->codeAppend(openBrace.c_str());
fEffectEmitter->emit(key, outColor, inColor, coords, samplers);
fsBuilder->codeAppend("\t}\n");
}
void GrGLFragmentOnlyProgramBuilder::setupPathTexGen(
const GrProcessorStage& effectStage, GrGLProcessor::TransformedCoordsArray* outCoords) {
int numTransforms = effectStage.getProcessor()->numTransforms();
int texCoordIndex = this->addTexCoordSets(numTransforms);
fProgramEffects->addTransforms(texCoordIndex);
SkString name;
for (int t = 0; t < numTransforms; ++t) {
GrSLType type =
effectStage.isPerspectiveCoordTransform(t, false) ?
kVec3f_GrSLType :
kVec2f_GrSLType;
name.printf("%s(gl_TexCoord[%i])", GrGLSLTypeString(type), texCoordIndex++);
SkNEW_APPEND_TO_TARRAY(outCoords, GrGLProcessor::TransformedCoords, (name, type));
}
}
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