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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 "GrGLFullProgramBuilder.h"
#include "../GrGLGeometryProcessor.h"
#include "../GrGpuGL.h"
GrGLFullProgramBuilder::GrGLFullProgramBuilder(GrGpuGL* gpu,
const GrGLProgramDesc& desc)
: INHERITED(gpu, desc)
, fGLGeometryProcessorEmitter(this)
, fGS(this)
, fVS(this) {
}
void
GrGLFullProgramBuilder::createAndEmitEffects(const GrGeometryStage* geometryProcessor,
const GrFragmentStage* colorStages[],
const GrFragmentStage* coverageStages[],
GrGLSLExpr4* inputColor,
GrGLSLExpr4* inputCoverage) {
fVS.emitCodeBeforeEffects(inputColor, 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));
if (geometryProcessor) {
const GrGeometryProcessor& gp = *geometryProcessor->getGeometryProcessor();
fGLGeometryProcessorEmitter.set(&gp);
fEffectEmitter = &fGLGeometryProcessorEmitter;
fVS.emitAttributes(gp);
GrGLSLExpr4 gpInputCoverage = *inputCoverage;
GrGLSLExpr4 gpOutputCoverage;
EffectKeyProvider gpKeyProvider(&this->desc(),
EffectKeyProvider::kGeometryProcessor_EffectType);
bool useLocalCoords = this->getVertexShaderBuilder()->hasExplicitLocalCoords();
fProgramEffects.reset(SkNEW_ARGS(GrGLVertexProgramEffects, (1, useLocalCoords)));
this->INHERITED::emitEffect(*geometryProcessor, 0, gpKeyProvider, &gpInputCoverage,
&gpOutputCoverage);
fGeometryProcessor.reset(fProgramEffects.detach());
*inputCoverage = gpOutputCoverage;
}
EffectKeyProvider coverageKeyProvider(&this->desc(), EffectKeyProvider::kCoverage_EffectType);
fCoverageEffects.reset(this->onCreateAndEmitEffects(coverageStages,
this->desc().numCoverageEffects(),
coverageKeyProvider,
inputCoverage));
fVS.emitCodeAfterEffects();
}
void GrGLFullProgramBuilder::addVarying(GrSLType type,
const char* name,
const char** vsOutName,
const char** fsInName,
GrGLShaderVar::Precision fsPrecision) {
fVS.addVarying(type, name, vsOutName);
SkString* fsInputName = fVS.fOutputs.back().accessName();
#if GR_GL_EXPERIMENTAL_GS
if (desc().getHeader().fExperimentalGS) {
// TODO let the caller use these names
fGS.addVarying(type, fsInputName->c_str(), NULL);
fsInputName = fGS.fOutputs.back().accessName();
}
#endif
fFS.addVarying(type, fsInputName->c_str(), fsInName, fsPrecision);
}
GrGLFullProgramBuilder::VaryingHandle
GrGLFullProgramBuilder::addSeparableVarying(GrSLType type,
const char* name,
const char** vsOutName,
const char** fsInName) {
addVarying(type, name, vsOutName, fsInName);
SeparableVaryingInfo& varying = fSeparableVaryingInfos.push_back();
varying.fVariable = fFS.fInputs.back();
return VaryingHandle::CreateFromSeparableVaryingIndex(fSeparableVaryingInfos.count() - 1);
}
GrGLProgramEffects* GrGLFullProgramBuilder::onCreateAndEmitEffects(
const GrFragmentStage* effectStages[],
int effectCnt,
const GrGLProgramDesc::EffectKeyProvider& keyProvider,
GrGLSLExpr4* inOutFSColor) {
fProgramEffects.reset(SkNEW_ARGS(GrGLVertexProgramEffects,
(effectCnt,
this->getVertexShaderBuilder()->hasExplicitLocalCoords())));
this->INHERITED::createAndEmitEffects(effectStages,
effectCnt,
keyProvider,
inOutFSColor);
return fProgramEffects.detach();
}
void GrGLFullProgramBuilder::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->emitTransforms(stage, &coords);
this->emitSamplers(effect, &samplers);
SkASSERT(fEffectEmitter);
GrGLProcessor* glEffect = fEffectEmitter->createGLInstance();
fProgramEffects->addEffect(glEffect);
// Enclose custom code in a block to avoid namespace conflicts
SkString openBrace;
openBrace.printf("{ // Stage %d: %s\n", stageIndex, glEffect->name());
fFS.codeAppend(openBrace.c_str());
fVS.codeAppend(openBrace.c_str());
fEffectEmitter->emit(key, outColor, inColor, coords, samplers);
fVS.codeAppend("\t}\n");
fFS.codeAppend("\t}\n");
}
void GrGLFullProgramBuilder::emitTransforms(const GrProcessorStage& effectStage,
GrGLProcessor::TransformedCoordsArray* outCoords) {
SkTArray<GrGLVertexProgramEffects::Transform, true>& transforms =
fProgramEffects->addTransforms();
const GrProcessor* effect = effectStage.getProcessor();
int numTransforms = effect->numTransforms();
transforms.push_back_n(numTransforms);
SkTArray<GrGLVertexProgramEffects::PathTransform, true>* pathTransforms = NULL;
const GrGLCaps* glCaps = this->ctxInfo().caps();
if (glCaps->pathRenderingSupport() &&
this->gpu()->glPathRendering()->texturingMode() ==
GrGLPathRendering::SeparableShaders_TexturingMode) {
pathTransforms = &fProgramEffects->addPathTransforms();
pathTransforms->push_back_n(numTransforms);
}
for (int t = 0; t < numTransforms; t++) {
const char* uniName = "StageMatrix";
GrSLType varyingType =
effectStage.isPerspectiveCoordTransform(t, fVS.hasExplicitLocalCoords()) ?
kVec3f_GrSLType :
kVec2f_GrSLType;
SkString suffixedUniName;
if (0 != t) {
suffixedUniName.append(uniName);
suffixedUniName.appendf("_%i", t);
uniName = suffixedUniName.c_str();
}
transforms[t].fHandle = this->addUniform(GrGLProgramBuilder::kVertex_Visibility,
kMat33f_GrSLType,
uniName,
&uniName);
const char* varyingName = "MatrixCoord";
SkString suffixedVaryingName;
if (0 != t) {
suffixedVaryingName.append(varyingName);
suffixedVaryingName.appendf("_%i", t);
varyingName = suffixedVaryingName.c_str();
}
const char* vsVaryingName;
const char* fsVaryingName;
if (pathTransforms) {
(*pathTransforms)[t].fHandle =
this->addSeparableVarying(varyingType, varyingName, &vsVaryingName, &fsVaryingName);
(*pathTransforms)[t].fType = varyingType;
} else {
this->addVarying(varyingType, varyingName, &vsVaryingName, &fsVaryingName);
}
const GrGLShaderVar& coords =
kPosition_GrCoordSet == effect->coordTransform(t).sourceCoords() ?
fVS.positionAttribute() :
fVS.localCoordsAttribute();
// varying = matrix * coords (logically)
SkASSERT(kVec2f_GrSLType == varyingType || kVec3f_GrSLType == varyingType);
if (kVec2f_GrSLType == varyingType) {
fVS.codeAppendf("%s = (%s * vec3(%s, 1)).xy;",
vsVaryingName, uniName, coords.c_str());
} else {
fVS.codeAppendf("%s = %s * vec3(%s, 1);",
vsVaryingName, uniName, coords.c_str());
}
SkNEW_APPEND_TO_TARRAY(outCoords, GrGLProcessor::TransformedCoords,
(SkString(fsVaryingName), varyingType));
}
}
bool GrGLFullProgramBuilder::compileAndAttachShaders(GrGLuint programId,
SkTDArray<GrGLuint>* shaderIds) const {
return INHERITED::compileAndAttachShaders(programId, shaderIds)
&& fVS.compileAndAttachShaders(programId, shaderIds)
#if GR_GL_EXPERIMENTAL_GS
&& (!desc().getHeader().fExperimentalGS
|| fGS.compileAndAttachShaders(programId, shaderIds))
#endif
;
}
void GrGLFullProgramBuilder::bindProgramLocations(GrGLuint programId) {
fVS.bindProgramLocations(programId);
INHERITED::bindProgramLocations(programId);
}
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