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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"
#include "GrDrawTargetCaps.h"
#include "GrGpu.h"
#include "GrProcOptInfo.h"
#include "GrXferProcessor.h"
GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
const GrGeometryProcessor* gp,
const GrPathProcessor* pathProc,
const GrDrawTargetCaps& caps,
const GrScissorState& scissorState,
const GrDeviceCoordTexture* dstCopy,
GrGpu::DrawType drawType)
: fFinalized(false) {
fDrawType = drawType;
// Copy GeometryProcesssor from DS or ODS
if (gp) {
SkASSERT(!pathProc);
SkASSERT(!GrGpu::IsPathRenderingDrawType(drawType));
fGeometryProcessor.reset(gp);
fPrimitiveProcessor.reset(gp);
} else {
SkASSERT(!gp && pathProc && GrGpu::IsPathRenderingDrawType(drawType));
fPrimitiveProcessor.reset(pathProc);
}
const GrProcOptInfo& colorPOI = drawState.colorProcInfo(fPrimitiveProcessor);
const GrProcOptInfo& coveragePOI = drawState.coverageProcInfo(fPrimitiveProcessor);
// Create XferProcessor from DS's XPFactory
SkAutoTUnref<GrXferProcessor> xferProcessor(
drawState.getXPFactory()->createXferProcessor(colorPOI, coveragePOI));
GrColor overrideColor = GrColor_ILLEGAL;
if (colorPOI.firstEffectiveStageIndex() != 0) {
overrideColor = colorPOI.inputColorToEffectiveStage();
}
GrXferProcessor::OptFlags optFlags;
if (xferProcessor) {
fXferProcessor.reset(xferProcessor.get());
optFlags = xferProcessor->getOptimizations(colorPOI,
coveragePOI,
drawState.getStencil().doesWrite(),
&overrideColor,
caps);
}
// When path rendering the stencil settings are not always set on the draw state
// so we must check the draw type. In cases where we will skip drawing we simply return a
// null GrOptDrawState.
if (!xferProcessor || (GrXferProcessor::kSkipDraw_OptFlag & optFlags)) {
// Set the fields that don't default init and return. The lack of a render target will
// indicate that this can be skipped.
fFlags = 0;
fDrawFace = GrDrawState::kInvalid_DrawFace;
fViewMatrix.reset();
return;
}
fRenderTarget.reset(drawState.fRenderTarget.get());
SkASSERT(fRenderTarget);
fScissorState = scissorState;
fViewMatrix = fPrimitiveProcessor->viewMatrix();
fStencilSettings = drawState.getStencil();
fDrawFace = drawState.getDrawFace();
// TODO move this out of optDrawState
if (dstCopy) {
fDstCopy = *dstCopy;
}
fFlags = 0;
if (drawState.isHWAntialias()) {
fFlags |= kHWAA_Flag;
}
if (drawState.isDither()) {
fFlags |= kDither_Flag;
}
// TODO move local coords completely into GP
bool hasLocalCoords = gp && gp->hasLocalCoords();
int firstColorStageIdx = colorPOI.firstEffectiveStageIndex();
// TODO: Once we can handle single or four channel input into coverage stages then we can use
// drawState's coverageProcInfo (like color above) to set this initial information.
int firstCoverageStageIdx = 0;
GrXferProcessor::BlendInfo blendInfo;
fXferProcessor->getBlendInfo(&blendInfo);
this->adjustProgramFromOptimizations(drawState, optFlags, colorPOI, coveragePOI,
&firstColorStageIdx, &firstCoverageStageIdx);
fDescInfo.fRequiresLocalCoordAttrib = hasLocalCoords;
bool usesLocalCoords = false;
// Copy Stages from DS to ODS
for (int i = firstColorStageIdx; i < drawState.numColorStages(); ++i) {
SkNEW_APPEND_TO_TARRAY(&fFragmentStages,
GrPendingFragmentStage,
(drawState.fColorStages[i]));
usesLocalCoords = usesLocalCoords ||
drawState.fColorStages[i].processor()->usesLocalCoords();
}
fNumColorStages = fFragmentStages.count();
for (int i = firstCoverageStageIdx; i < drawState.numCoverageStages(); ++i) {
SkNEW_APPEND_TO_TARRAY(&fFragmentStages,
GrPendingFragmentStage,
(drawState.fCoverageStages[i]));
usesLocalCoords = usesLocalCoords ||
drawState.fCoverageStages[i].processor()->usesLocalCoords();
}
// let the GP init the batch tracker
GrGeometryProcessor::InitBT init;
init.fColorIgnored = SkToBool(optFlags & GrXferProcessor::kIgnoreColor_OptFlag);
init.fOverrideColor = init.fColorIgnored ? GrColor_ILLEGAL : overrideColor;
init.fCoverageIgnored = SkToBool(optFlags & GrXferProcessor::kIgnoreCoverage_OptFlag);
init.fUsesLocalCoords = usesLocalCoords;
fPrimitiveProcessor->initBatchTracker(&fBatchTracker, init);
}
void GrOptDrawState::adjustProgramFromOptimizations(const GrDrawState& ds,
GrXferProcessor::OptFlags flags,
const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
int* firstColorStageIdx,
int* firstCoverageStageIdx) {
fDescInfo.fReadsDst = false;
fDescInfo.fReadsFragPosition = false;
if ((flags & GrXferProcessor::kIgnoreColor_OptFlag) ||
(flags & GrXferProcessor::kOverrideColor_OptFlag)) {
*firstColorStageIdx = ds.numColorStages();
} else {
fDescInfo.fReadsDst = colorPOI.readsDst();
fDescInfo.fReadsFragPosition = colorPOI.readsFragPosition();
}
if (flags & GrXferProcessor::kIgnoreCoverage_OptFlag) {
*firstCoverageStageIdx = ds.numCoverageStages();
} else {
if (coveragePOI.readsDst()) {
fDescInfo.fReadsDst = true;
}
if (coveragePOI.readsFragPosition()) {
fDescInfo.fReadsFragPosition = true;
}
}
}
void GrOptDrawState::finalize(GrGpu* gpu) {
gpu->buildProgramDesc(*this, fDescInfo, fDrawType, &fDesc);
fFinalized = true;
}
////////////////////////////////////////////////////////////////////////////////
bool GrOptDrawState::combineIfPossible(const GrOptDrawState& that) {
if (fDescInfo != that.fDescInfo) {
return false;
}
if (this->getRenderTarget() != that.getRenderTarget() ||
this->fFragmentStages.count() != that.fFragmentStages.count() ||
this->fNumColorStages != that.fNumColorStages ||
this->fScissorState != that.fScissorState ||
!this->fViewMatrix.cheapEqualTo(that.fViewMatrix) ||
this->fDrawType != that.fDrawType ||
this->fFlags != that.fFlags ||
this->fStencilSettings != that.fStencilSettings ||
this->fDrawFace != that.fDrawFace ||
this->fDstCopy.texture() != that.fDstCopy.texture()) {
return false;
}
if (!this->getPrimitiveProcessor()->canMakeEqual(fBatchTracker,
*that.getPrimitiveProcessor(),
that.getBatchTracker())) {
return false;
}
if (!this->getXferProcessor()->isEqual(*that.getXferProcessor())) {
return false;
}
// The program desc comparison should have already assured that the stage counts match.
SkASSERT(this->numFragmentStages() == that.numFragmentStages());
for (int i = 0; i < this->numFragmentStages(); i++) {
if (this->getFragmentStage(i) != that.getFragmentStage(i)) {
return false;
}
}
// Now update the GrPrimitiveProcessor's batch tracker
fPrimitiveProcessor->makeEqual(&fBatchTracker, that.getBatchTracker());
return true;
}
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