| /* |
| * Copyright 2020 Google LLC. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/gpu/tessellate/GrStrokeTessellateOp.h" |
| |
| #include "src/core/SkPathPriv.h" |
| #include "src/gpu/GrRecordingContextPriv.h" |
| #include "src/gpu/tessellate/GrFillPathShader.h" |
| #include "src/gpu/tessellate/GrStencilPathShader.h" |
| #include "src/gpu/tessellate/GrStrokeFixedCountTessellator.h" |
| #include "src/gpu/tessellate/GrStrokeHardwareTessellator.h" |
| #include "src/gpu/tessellate/GrStrokeIndirectTessellator.h" |
| |
| using DynamicStroke = GrStrokeTessellateShader::DynamicStroke; |
| |
| GrStrokeTessellateOp::GrStrokeTessellateOp(GrAAType aaType, const SkMatrix& viewMatrix, |
| const SkPath& path, const SkStrokeRec& stroke, |
| GrPaint&& paint) |
| : GrDrawOp(ClassID()) |
| , fAAType(aaType) |
| , fViewMatrix(viewMatrix) |
| , fPathStrokeList(path, stroke, paint.getColor4f()) |
| , fTotalCombinedVerbCnt(path.countVerbs()) |
| , fProcessors(std::move(paint)) { |
| if (SkPathPriv::ConicWeightCnt(path) != 0) { |
| fShaderFlags |= ShaderFlags::kHasConics; |
| } |
| if (!this->headColor().fitsInBytes()) { |
| fShaderFlags |= ShaderFlags::kWideColor; |
| } |
| SkRect devBounds = path.getBounds(); |
| float inflationRadius = stroke.getInflationRadius(); |
| devBounds.outset(inflationRadius, inflationRadius); |
| viewMatrix.mapRect(&devBounds, devBounds); |
| this->setBounds(devBounds, HasAABloat::kNo, IsHairline::kNo); |
| } |
| |
| void GrStrokeTessellateOp::visitProxies(const VisitProxyFunc& fn) const { |
| if (fFillProgram) { |
| fFillProgram->visitFPProxies(fn); |
| } else if (fStencilProgram) { |
| fStencilProgram->visitFPProxies(fn); |
| } else { |
| fProcessors.visitProxies(fn); |
| } |
| } |
| |
| GrDrawOp::FixedFunctionFlags GrStrokeTessellateOp::fixedFunctionFlags() const { |
| // We might not actually end up needing stencil, but won't know for sure until finalize(). |
| // Request it just in case we do end up needing it. |
| auto flags = FixedFunctionFlags::kUsesStencil; |
| if (GrAAType::kNone != fAAType) { |
| flags |= FixedFunctionFlags::kUsesHWAA; |
| } |
| return flags; |
| } |
| |
| GrProcessorSet::Analysis GrStrokeTessellateOp::finalize(const GrCaps& caps, |
| const GrAppliedClip* clip, |
| GrClampType clampType) { |
| // Make sure the finalize happens before combining. We might change fNeedsStencil here. |
| SkASSERT(fPathStrokeList.fNext == nullptr); |
| const GrProcessorSet::Analysis& analysis = fProcessors.finalize( |
| this->headColor(), GrProcessorAnalysisCoverage::kNone, clip, |
| &GrUserStencilSettings::kUnused, caps, clampType, &this->headColor()); |
| fNeedsStencil = !analysis.unaffectedByDstValue(); |
| return analysis; |
| } |
| |
| GrOp::CombineResult GrStrokeTessellateOp::onCombineIfPossible(GrOp* grOp, SkArenaAlloc* alloc, |
| const GrCaps& caps) { |
| SkASSERT(grOp->classID() == this->classID()); |
| auto* op = static_cast<GrStrokeTessellateOp*>(grOp); |
| |
| if (fNeedsStencil || |
| op->fNeedsStencil || |
| fViewMatrix != op->fViewMatrix || |
| fAAType != op->fAAType || |
| fProcessors != op->fProcessors || |
| this->headStroke().isHairlineStyle() != op->headStroke().isHairlineStyle()) { |
| return CombineResult::kCannotCombine; |
| } |
| |
| auto combinedFlags = fShaderFlags | op->fShaderFlags; |
| if (!(combinedFlags & ShaderFlags::kDynamicStroke) && |
| !DynamicStroke::StrokesHaveEqualDynamicState(this->headStroke(), op->headStroke())) { |
| // The paths have different stroke properties. We will need to enable dynamic stroke if we |
| // still decide to combine them. |
| if (this->headStroke().isHairlineStyle()) { |
| return CombineResult::kCannotCombine; // Dynamic hairlines aren't supported. |
| } |
| combinedFlags |= ShaderFlags::kDynamicStroke; |
| } |
| if (!(combinedFlags & ShaderFlags::kDynamicColor) && this->headColor() != op->headColor()) { |
| // The paths have different colors. We will need to enable dynamic color if we still decide |
| // to combine them. |
| combinedFlags |= ShaderFlags::kDynamicColor; |
| } |
| |
| // Don't actually enable new dynamic state on ops that already have lots of verbs. |
| constexpr static GrTFlagsMask<ShaderFlags> kDynamicStatesMask(ShaderFlags::kDynamicStroke | |
| ShaderFlags::kDynamicColor); |
| ShaderFlags neededDynamicStates = combinedFlags & kDynamicStatesMask; |
| if (neededDynamicStates != ShaderFlags::kNone) { |
| if (!this->shouldUseDynamicStates(neededDynamicStates) || |
| !op->shouldUseDynamicStates(neededDynamicStates)) { |
| return CombineResult::kCannotCombine; |
| } |
| } |
| |
| fShaderFlags = combinedFlags; |
| |
| // Concat the op's PathStrokeList. Since the head element is allocated inside the op, we need to |
| // copy it. |
| auto* headCopy = alloc->make<PathStrokeList>(std::move(op->fPathStrokeList)); |
| *fPathStrokeTail = headCopy; |
| fPathStrokeTail = (op->fPathStrokeTail == &op->fPathStrokeList.fNext) ? &headCopy->fNext |
| : op->fPathStrokeTail; |
| |
| fTotalCombinedVerbCnt += op->fTotalCombinedVerbCnt; |
| return CombineResult::kMerged; |
| } |
| |
| // Marks every stencil value as "1". |
| constexpr static GrUserStencilSettings kMarkStencil( |
| GrUserStencilSettings::StaticInit< |
| 0x0001, |
| GrUserStencilTest::kLessIfInClip, // Match kTestAndResetStencil. |
| 0x0000, // Always fail. |
| GrUserStencilOp::kZero, |
| GrUserStencilOp::kReplace, |
| 0xffff>()); |
| |
| // Passes if the stencil value is nonzero. Also resets the stencil value to zero on pass. This is |
| // formulated to match kMarkStencil everywhere except the ref and compare mask. This will allow us |
| // to use the same pipeline for both stencil and fill if dynamic stencil state is supported. |
| constexpr static GrUserStencilSettings kTestAndResetStencil( |
| GrUserStencilSettings::StaticInit< |
| 0x0000, |
| GrUserStencilTest::kLessIfInClip, // i.e., "not equal to zero, if in clip". |
| 0x0001, |
| GrUserStencilOp::kZero, |
| GrUserStencilOp::kReplace, |
| 0xffff>()); |
| |
| bool GrStrokeTessellateOp::canUseHardwareTessellation(int numVerbs, const GrCaps& caps) { |
| SkASSERT(!fStencilProgram && !fFillProgram); // Ensure we haven't std::moved fProcessors. |
| if (!caps.shaderCaps()->tessellationSupport()) { |
| return false; |
| } |
| if (fProcessors.usesVaryingCoords()) { |
| // Our back door for HW tessellation shaders isn't currently capable of passing varyings to |
| // the fragment shader, so if the processors have varyings, we need to use instanced draws |
| // instead. |
| return false; |
| } |
| #if GR_TEST_UTILS |
| if (caps.shaderCaps()->maxTessellationSegments() < 64) { |
| // If maxTessellationSegments is lower than the spec minimum, it means we've overriden it |
| // for testing. Always use hardware tessellation if this is the case. |
| return true; |
| } |
| #endif |
| // Only use hardware tessellation if we're drawing a somewhat large number of verbs. Otherwise |
| // we seem to be better off using instanced draws. |
| return numVerbs >= 50; |
| } |
| |
| void GrStrokeTessellateOp::prePrepareTessellator(GrPathShader::ProgramArgs&& args, |
| GrAppliedClip&& clip) { |
| SkASSERT(!fTessellator); |
| SkASSERT(!fFillProgram); |
| SkASSERT(!fStencilProgram); |
| |
| const GrCaps& caps = *args.fCaps; |
| SkArenaAlloc* arena = args.fArena; |
| |
| if (this->canUseHardwareTessellation(fTotalCombinedVerbCnt, caps)) { |
| // Only use hardware tessellation if we're drawing a somewhat large number of verbs. |
| // Otherwise we seem to be better off using instanced draws. |
| fTessellator = arena->make<GrStrokeHardwareTessellator>(fShaderFlags, fViewMatrix, |
| &fPathStrokeList, |
| *caps.shaderCaps()); |
| } else if (fTotalCombinedVerbCnt > 50 && !(fShaderFlags & ShaderFlags::kDynamicColor)) { |
| // Only use the log2 indirect tessellator if we're drawing a somewhat large number of verbs |
| // and the stroke doesn't use dynamic color. (The log2 indirect tessellator can't support |
| // dynamic color without a z-buffer, due to how it reorders strokes.) |
| fTessellator = arena->make<GrStrokeIndirectTessellator>(fShaderFlags, fViewMatrix, |
| &fPathStrokeList, |
| fTotalCombinedVerbCnt, arena); |
| } else { |
| fTessellator = arena->make<GrStrokeFixedCountTessellator>(fShaderFlags, fViewMatrix, |
| &fPathStrokeList); |
| } |
| |
| auto* pipeline = GrFillPathShader::MakeFillPassPipeline(args, fAAType, std::move(clip), |
| std::move(fProcessors)); |
| auto fillStencil = &GrUserStencilSettings::kUnused; |
| if (fNeedsStencil) { |
| fStencilProgram = GrPathShader::MakeProgram(args, fTessellator->shader(), pipeline, |
| &kMarkStencil); |
| fillStencil = &kTestAndResetStencil; |
| args.fXferBarrierFlags = GrXferBarrierFlags::kNone; |
| } |
| |
| fFillProgram = GrPathShader::MakeProgram(args, fTessellator->shader(), pipeline, fillStencil); |
| } |
| |
| void GrStrokeTessellateOp::onPrePrepare(GrRecordingContext* context, |
| const GrSurfaceProxyView& writeView, GrAppliedClip* clip, |
| const GrXferProcessor::DstProxyView& dstProxyView, |
| GrXferBarrierFlags renderPassXferBarriers, GrLoadOp |
| colorLoadOp) { |
| this->prePrepareTessellator({context->priv().recordTimeAllocator(), writeView, &dstProxyView, |
| renderPassXferBarriers, colorLoadOp, context->priv().caps()}, |
| (clip) ? std::move(*clip) : GrAppliedClip::Disabled()); |
| if (fStencilProgram) { |
| context->priv().recordProgramInfo(fStencilProgram); |
| } |
| if (fFillProgram) { |
| context->priv().recordProgramInfo(fFillProgram); |
| } |
| } |
| |
| void GrStrokeTessellateOp::onPrepare(GrOpFlushState* flushState) { |
| if (!fTessellator) { |
| this->prePrepareTessellator({flushState->allocator(), flushState->writeView(), |
| &flushState->dstProxyView(), flushState->renderPassBarriers(), |
| flushState->colorLoadOp(), &flushState->caps()}, |
| flushState->detachAppliedClip()); |
| } |
| SkASSERT(fTessellator); |
| fTessellator->prepare(flushState, fTotalCombinedVerbCnt); |
| } |
| |
| void GrStrokeTessellateOp::onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) { |
| if (fStencilProgram) { |
| flushState->bindPipelineAndScissorClip(*fStencilProgram, chainBounds); |
| flushState->bindTextures(fStencilProgram->geomProc(), nullptr, fStencilProgram->pipeline()); |
| fTessellator->draw(flushState); |
| } |
| if (fFillProgram) { |
| flushState->bindPipelineAndScissorClip(*fFillProgram, chainBounds); |
| flushState->bindTextures(fFillProgram->geomProc(), nullptr, fFillProgram->pipeline()); |
| fTessellator->draw(flushState); |
| } |
| } |
