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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 "GrOptDrawState.h"
#include "GrDrawState.h"
GrOptDrawState::GrOptDrawState(const GrDrawState& drawState) : INHERITED(drawState) {
fColor = drawState.getColor();
fCoverage = drawState.getCoverage();
fViewMatrix = drawState.getViewMatrix();
fBlendConstant = drawState.getBlendConstant();
fFlagBits = drawState.getFlagBits();
fVAPtr = drawState.getVertexAttribs();
fVACount = drawState.getVertexAttribCount();
fVAStride = drawState.getVertexStride();
fStencilSettings = drawState.getStencil();
fDrawFace = drawState.getDrawFace();
fBlendOptFlags = drawState.getBlendOpts(false, &fSrcBlend, &fDstBlend);
memcpy(fFixedFunctionVertexAttribIndices,
drawState.getFixedFunctionVertexAttribIndices(),
sizeof(fFixedFunctionVertexAttribIndices));
fInputColorIsUsed = true;
fInputCoverageIsUsed = true;
if (drawState.hasGeometryProcessor()) {
fGeometryProcessor.reset(SkNEW_ARGS(GrEffectStage, (*drawState.getGeometryProcessor())));
} else {
fGeometryProcessor.reset(NULL);
}
this->copyEffectiveColorStages(drawState);
this->copyEffectiveCoverageStages(drawState);
};
void GrOptDrawState::removeFixedFunctionVertexAttribs(uint8_t removeVAFlag) {
int numToRemove = 0;
uint8_t maskCheck = 0x1;
// Count the number of vertex attributes that we will actually remove
for (int i = 0; i < kGrFixedFunctionVertexAttribBindingCnt; ++i) {
if ((maskCheck & removeVAFlag) && -1 != fFixedFunctionVertexAttribIndices[i]) {
++numToRemove;
}
maskCheck <<= 1;
}
fOptVA.reset(fVACount - numToRemove);
GrVertexAttrib* dst = fOptVA.get();
const GrVertexAttrib* src = fVAPtr;
for (int i = 0, newIdx = 0; i < fVACount; ++i, ++src) {
const GrVertexAttrib& currAttrib = *src;
if (currAttrib.fBinding < kGrFixedFunctionVertexAttribBindingCnt) {
uint8_t maskCheck = 0x1 << currAttrib.fBinding;
if (maskCheck & removeVAFlag) {
SkASSERT(-1 != fFixedFunctionVertexAttribIndices[currAttrib.fBinding]);
fFixedFunctionVertexAttribIndices[currAttrib.fBinding] = -1;
continue;
}
}
memcpy(dst, src, sizeof(GrVertexAttrib));
fFixedFunctionVertexAttribIndices[currAttrib.fBinding] = newIdx;
++newIdx;
++dst;
}
fVACount -= numToRemove;
fVAPtr = fOptVA.get();
}
void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
int firstColorStage = 0;
// Set up color and flags for ConstantColorComponent checks
GrColor color;
uint32_t validComponentFlags;
if (!this->hasColorVertexAttribute()) {
color = ds.getColor();
validComponentFlags = kRGBA_GrColorComponentFlags;
} else {
if (ds.vertexColorsAreOpaque()) {
color = 0xFF << GrColor_SHIFT_A;
validComponentFlags = kA_GrColorComponentFlag;
} else {
validComponentFlags = 0;
color = 0; // not strictly necessary but we get false alarms from tools about uninit.
}
}
for (int i = 0; i < ds.numColorStages(); ++i) {
const GrEffect* effect = ds.getColorStage(i).getEffect();
if (!effect->willUseInputColor()) {
firstColorStage = i;
fInputColorIsUsed = false;
}
effect->getConstantColorComponents(&color, &validComponentFlags);
if (kRGBA_GrColorComponentFlags == validComponentFlags) {
firstColorStage = i + 1;
fColor = color;
fInputColorIsUsed = true;
this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding);
}
}
if (firstColorStage < ds.numColorStages()) {
fColorStages.reset(&ds.getColorStage(firstColorStage),
ds.numColorStages() - firstColorStage);
} else {
fColorStages.reset();
}
}
void GrOptDrawState::copyEffectiveCoverageStages(const GrDrawState& ds) {
int firstCoverageStage = 0;
// We do not try to optimize out constantColor coverage effects here. It is extremely rare
// to have a coverage effect that returns a constant value for all four channels. Thus we
// save having to make extra virtual calls by not checking for it.
// Don't do any optimizations on coverage stages. It should not be the case where we do not use
// input coverage in an effect
#ifdef OptCoverageStages
for (int i = 0; i < ds.numCoverageStages(); ++i) {
const GrEffect* effect = ds.getCoverageStage(i).getEffect();
if (!effect->willUseInputColor()) {
firstCoverageStage = i;
fInputCoverageIsUsed = false;
}
}
#endif
if (ds.numCoverageStages() > 0) {
fCoverageStages.reset(&ds.getCoverageStage(firstCoverageStage),
ds.numCoverageStages() - firstCoverageStage);
} else {
fCoverageStages.reset();
}
}
bool GrOptDrawState::operator== (const GrOptDrawState& that) const {
return this->isEqual(that);
}
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