| /* |
| * 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" |
| |
| GrOptDrawState::GrOptDrawState(const GrDrawState& drawState, |
| BlendOptFlags blendOptFlags, |
| GrBlendCoeff optSrcCoeff, |
| GrBlendCoeff optDstCoeff, |
| const GrDrawTargetCaps& caps) : 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 = blendOptFlags; |
| fSrcBlend = optSrcCoeff; |
| fDstBlend = optDstCoeff; |
| |
| memcpy(fFixedFunctionVertexAttribIndices, |
| drawState.getFixedFunctionVertexAttribIndices(), |
| sizeof(fFixedFunctionVertexAttribIndices)); |
| |
| |
| fInputColorIsUsed = true; |
| fInputCoverageIsUsed = true; |
| |
| if (drawState.hasGeometryProcessor()) { |
| fGeometryProcessor.reset(SkNEW_ARGS(GrGeometryStage, (*drawState.getGeometryProcessor()))); |
| } else { |
| fGeometryProcessor.reset(NULL); |
| } |
| |
| this->copyEffectiveColorStages(drawState); |
| this->copyEffectiveCoverageStages(drawState); |
| this->adjustFromBlendOpts(); |
| this->getStageStats(); |
| this->setOutputStateInfo(caps); |
| }; |
| |
| void GrOptDrawState::setOutputStateInfo(const GrDrawTargetCaps& caps) { |
| // Set this default and then possibly change our mind if there is coverage. |
| fPrimaryOutputType = kModulate_PrimaryOutputType; |
| fSecondaryOutputType = kNone_SecondaryOutputType; |
| |
| // If we do have coverage determine whether it matters. |
| bool separateCoverageFromColor = this->hasGeometryProcessor(); |
| if (!this->isCoverageDrawing() && |
| (this->numCoverageStages() > 0 || |
| this->hasGeometryProcessor() || |
| this->hasCoverageVertexAttribute())) { |
| |
| if (caps.dualSourceBlendingSupport()) { |
| if (kZero_GrBlendCoeff == fDstBlend) { |
| // write the coverage value to second color |
| fSecondaryOutputType = kCoverage_SecondaryOutputType; |
| separateCoverageFromColor = true; |
| fDstBlend = (GrBlendCoeff)GrGpu::kIS2C_GrBlendCoeff; |
| } else if (kSA_GrBlendCoeff == fDstBlend) { |
| // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered. |
| fSecondaryOutputType = kCoverageISA_SecondaryOutputType; |
| separateCoverageFromColor = true; |
| fDstBlend = (GrBlendCoeff)GrGpu::kIS2C_GrBlendCoeff; |
| } else if (kSC_GrBlendCoeff == fDstBlend) { |
| // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered. |
| fSecondaryOutputType = kCoverageISC_SecondaryOutputType; |
| separateCoverageFromColor = true; |
| fDstBlend = (GrBlendCoeff)GrGpu::kIS2C_GrBlendCoeff; |
| } |
| } else if (fReadsDst && |
| kOne_GrBlendCoeff == fSrcBlend && |
| kZero_GrBlendCoeff == fDstBlend) { |
| fPrimaryOutputType = kCombineWithDst_PrimaryOutputType; |
| separateCoverageFromColor = true; |
| } |
| } |
| |
| // TODO: Once we have flag to know if we only multiply on stages, only push coverage into color |
| // stages if everything is multipy |
| if (!separateCoverageFromColor) { |
| for (int s = 0; s < this->numCoverageStages(); ++s) { |
| fColorStages.push_back(this->getCoverageStage(s)); |
| } |
| fCoverageStages.reset(); |
| } |
| } |
| |
| void GrOptDrawState::adjustFromBlendOpts() { |
| |
| switch (fBlendOptFlags) { |
| case kNone_BlendOpt: |
| case kSkipDraw_BlendOptFlag: |
| break; |
| case kCoverageAsAlpha_BlendOptFlag: |
| fFlagBits |= kCoverageDrawing_StateBit; |
| break; |
| case kEmitCoverage_BlendOptFlag: |
| fColor = 0xffffffff; |
| fInputColorIsUsed = true; |
| fColorStages.reset(); |
| this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding); |
| break; |
| case kEmitTransBlack_BlendOptFlag: |
| fColor = 0; |
| fCoverage = 0xff; |
| fInputColorIsUsed = true; |
| fInputCoverageIsUsed = true; |
| fColorStages.reset(); |
| fCoverageStages.reset(); |
| this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding | |
| 0x1 << kCoverage_GrVertexAttribBinding); |
| break; |
| default: |
| SkFAIL("Unknown BlendOptFlag"); |
| |
| } |
| } |
| |
| 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; |
| } |
| fFixedFunctionVertexAttribIndices[currAttrib.fBinding] = newIdx; |
| } |
| memcpy(dst, src, sizeof(GrVertexAttrib)); |
| ++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 GrFragmentProcessor* fp = ds.getColorStage(i).getFragmentProcessor(); |
| if (!fp->willUseInputColor()) { |
| firstColorStage = i; |
| fInputColorIsUsed = false; |
| } |
| fp->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 GrProcessor* processor = ds.getCoverageStage(i).getProcessor(); |
| if (!processor->willUseInputColor()) { |
| firstCoverageStage = i; |
| fInputCoverageIsUsed = false; |
| } |
| } |
| #endif |
| if (ds.numCoverageStages() > 0) { |
| fCoverageStages.reset(&ds.getCoverageStage(firstCoverageStage), |
| ds.numCoverageStages() - firstCoverageStage); |
| } else { |
| fCoverageStages.reset(); |
| } |
| } |
| |
| static void get_stage_stats(const GrFragmentStage& stage, bool* readsDst, bool* readsFragPosition) { |
| if (stage.getFragmentProcessor()->willReadDstColor()) { |
| *readsDst = true; |
| } |
| if (stage.getFragmentProcessor()->willReadFragmentPosition()) { |
| *readsFragPosition = true; |
| } |
| } |
| |
| void GrOptDrawState::getStageStats() { |
| // We will need a local coord attrib if there is one currently set on the optState and we are |
| // actually generating some effect code |
| fRequiresLocalCoordAttrib = this->hasLocalCoordAttribute() && this->numTotalStages() > 0; |
| |
| // if 1 == fVACount then that VA must be position, otherwise it contains some attribute which |
| // will require a vertexShader |
| fRequiresVertexShader = fVACount > 1; |
| |
| fReadsDst = false; |
| fReadsFragPosition = false; |
| |
| for (int s = 0; s < this->numColorStages(); ++s) { |
| const GrFragmentStage& stage = this->getColorStage(s); |
| get_stage_stats(stage, &fReadsDst, &fReadsFragPosition); |
| } |
| for (int s = 0; s < this->numCoverageStages(); ++s) { |
| const GrFragmentStage& stage = this->getCoverageStage(s); |
| get_stage_stats(stage, &fReadsDst, &fReadsFragPosition); |
| } |
| if (this->hasGeometryProcessor()) { |
| const GrGeometryStage& stage = *this->getGeometryProcessor(); |
| fReadsFragPosition = fReadsFragPosition || stage.getProcessor()->willReadFragmentPosition(); |
| SkASSERT(fRequiresVertexShader); |
| } |
| } |
| |
| bool GrOptDrawState::operator== (const GrOptDrawState& that) const { |
| return this->isEqual(that); |
| } |
| |