GrXferBarrierType GrXferProcessor::xferBarrierType(const GrRenderTarget* rt,
const GrCaps& caps) const {
SkASSERT(rt);
if (static_cast<const GrSurface*>(rt) == this->getDstTexture()) {
// Texture barriers are required when a shader reads and renders to the same texture.
SkASSERT(caps.textureBarrierSupport());
return kTexture_GrXferBarrierType;
}
return this->onXferBarrier(rt, caps);
}
GrXPFactory::AnalysisProperties GrXPFactory::GetAnalysisProperties(
const GrXPFactory* factory,
const GrProcessorAnalysisColor& color,
const GrProcessorAnalysisCoverage& coverage,
const GrCaps& caps) {
AnalysisProperties result;
if (factory) {
result = factory->analysisProperties(color, coverage, caps);
} else {
result = GrPorterDuffXPFactory::SrcOverAnalysisProperties(color, coverage, caps);
}
SkASSERT(!(result & AnalysisProperties::kRequiresDstTexture));
if ((result & AnalysisProperties::kReadsDstInShader) &&
!caps.shaderCaps()->dstReadInShaderSupport()) {
result |= AnalysisProperties::kRequiresDstTexture;
if (caps.textureBarrierSupport()) {
result |= AnalysisProperties::kRequiresBarrierBetweenOverlappingDraws;
}
}
return result;
}
