blob: a1624bd44908d44e78039d88488c1c52062aa38c [file] [log] [blame]
/*
* 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 "src/gpu/GrCaps.h"
#include "src/gpu/GrFragmentProcessor.h"
#include "src/gpu/GrGeometryProcessor.h"
#include "src/gpu/GrProcessorAnalysis.h"
GrColorFragmentProcessorAnalysis::GrColorFragmentProcessorAnalysis(
const GrProcessorAnalysisColor& input,
std::unique_ptr<GrFragmentProcessor> const fps[],
int count) {
fCompatibleWithCoverageAsAlpha = true;
fIsOpaque = input.isOpaque();
fUsesLocalCoords = false;
fWillReadDstColor = false;
fProcessorsToEliminate = 0;
fOutputColorKnown = input.isConstant(&fLastKnownOutputColor);
for (int i = 0; i < count; ++i) {
const GrFragmentProcessor* fp = fps[i].get();
if (fOutputColorKnown && fp->hasConstantOutputForConstantInput(fLastKnownOutputColor,
&fLastKnownOutputColor)) {
++fProcessorsToEliminate;
fIsOpaque = fLastKnownOutputColor.isOpaque();
// We reset these flags since the earlier fragment processors are being eliminated.
fCompatibleWithCoverageAsAlpha = true;
fUsesLocalCoords = false;
fWillReadDstColor = false;
continue;
}
fOutputColorKnown = false;
if (fIsOpaque && !fp->preservesOpaqueInput()) {
fIsOpaque = false;
}
if (fCompatibleWithCoverageAsAlpha && !fp->compatibleWithCoverageAsAlpha()) {
fCompatibleWithCoverageAsAlpha = false;
}
if (fp->usesSampleCoords()) {
fUsesLocalCoords = true;
}
if (fp->willReadDstColor()) {
fWillReadDstColor = true;
}
}
}
bool GrColorFragmentProcessorAnalysis::requiresDstTexture(const GrCaps& caps) const {
return this->willReadDstColor() && !caps.shaderCaps()->dstReadInShaderSupport();
}