| /* | |
| * 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/ops/StrokeTessellateOp.h" | |
| #include "src/core/SkMathPriv.h" | |
| #include "src/core/SkPathPriv.h" | |
| #include "src/gpu/GrAppliedClip.h" | |
| #include "src/gpu/GrOpFlushState.h" | |
| #include "src/gpu/GrRecordingContextPriv.h" | |
| #include "src/gpu/tessellate/StrokeFixedCountTessellator.h" | |
| #include "src/gpu/tessellate/StrokeHardwareTessellator.h" | |
| #include "src/gpu/tessellate/shaders/GrStrokeTessellationShader.h" | |
| namespace { | |
| bool can_use_hardware_tessellation(int numVerbs, const GrPipeline& pipeline, const GrCaps& caps) { | |
| if (!caps.shaderCaps()->tessellationSupport() || | |
| !caps.shaderCaps()->infinitySupport() /* The hw tessellation shaders use infinity. */) { | |
| return false; | |
| } | |
| if (pipeline.usesLocalCoords()) { | |
| // 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; | |
| } | |
| // 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 >= caps.minStrokeVerbsForHwTessellation(); | |
| } | |
| } // anonymous namespace | |
| namespace skgpu::v1 { | |
| StrokeTessellateOp::StrokeTessellateOp(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 (!this->headColor().fitsInBytes()) { | |
| fPatchAttribs |= PatchAttribs::kWideColorIfEnabled; | |
| } | |
| SkRect devBounds = path.getBounds(); | |
| if (!this->headStroke().isHairlineStyle()) { | |
| // Non-hairlines inflate in local path space (pre-transform). | |
| float r = stroke.getInflationRadius(); | |
| devBounds.outset(r, r); | |
| } | |
| viewMatrix.mapRect(&devBounds, devBounds); | |
| if (this->headStroke().isHairlineStyle()) { | |
| // Hairlines inflate in device space (post-transform). | |
| float r = SkStrokeRec::GetInflationRadius(stroke.getJoin(), stroke.getMiter(), | |
| stroke.getCap(), 1); | |
| devBounds.outset(r, r); | |
| } | |
| this->setBounds(devBounds, HasAABloat::kNo, IsHairline::kNo); | |
| } | |
| void StrokeTessellateOp::visitProxies(const GrVisitProxyFunc& func) const { | |
| if (fFillProgram) { | |
| fFillProgram->visitFPProxies(func); | |
| } else if (fStencilProgram) { | |
| fStencilProgram->visitFPProxies(func); | |
| } else { | |
| fProcessors.visitProxies(func); | |
| } | |
| } | |
| GrProcessorSet::Analysis StrokeTessellateOp::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); | |
| if (!caps.shaderCaps()->infinitySupport()) { | |
| // The GPU can't infer curve type based in infinity, so we need to send in an attrib | |
| // explicitly stating the curve type. | |
| fPatchAttribs |= PatchAttribs::kExplicitCurveType; | |
| } | |
| const GrProcessorSet::Analysis& analysis = fProcessors.finalize( | |
| this->headColor(), GrProcessorAnalysisCoverage::kNone, clip, | |
| &GrUserStencilSettings::kUnused, caps, clampType, &this->headColor()); | |
| fNeedsStencil = !analysis.unaffectedByDstValue(); | |
| return analysis; | |
| } | |
| GrOp::CombineResult StrokeTessellateOp::onCombineIfPossible(GrOp* grOp, SkArenaAlloc* alloc, | |
| const GrCaps& caps) { | |
| SkASSERT(grOp->classID() == this->classID()); | |
| auto* op = static_cast<StrokeTessellateOp*>(grOp); | |
| // This must be called after finalize(). fNeedsStencil can change in finalize(). | |
| SkASSERT(fProcessors.isFinalized()); | |
| SkASSERT(op->fProcessors.isFinalized()); | |
| if (fNeedsStencil || | |
| op->fNeedsStencil || | |
| fViewMatrix != op->fViewMatrix || | |
| fAAType != op->fAAType || | |
| fProcessors != op->fProcessors || | |
| this->headStroke().isHairlineStyle() != op->headStroke().isHairlineStyle()) { | |
| return CombineResult::kCannotCombine; | |
| } | |
| auto combinedAttribs = fPatchAttribs | op->fPatchAttribs; | |
| if (!(combinedAttribs & PatchAttribs::kStrokeParams) && | |
| !StrokeParams::StrokesHaveEqualParams(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. | |
| } | |
| combinedAttribs |= PatchAttribs::kStrokeParams; | |
| } | |
| if (!(combinedAttribs & PatchAttribs::kColor) && this->headColor() != op->headColor()) { | |
| // The paths have different colors. We will need to enable dynamic color if we still decide | |
| // to combine them. | |
| combinedAttribs |= PatchAttribs::kColor; | |
| } | |
| // Don't actually enable new dynamic state on ops that already have lots of verbs. | |
| constexpr static GrTFlagsMask<PatchAttribs> kDynamicStatesMask(PatchAttribs::kStrokeParams | | |
| PatchAttribs::kColor); | |
| PatchAttribs neededDynamicStates = combinedAttribs & kDynamicStatesMask; | |
| if (neededDynamicStates != PatchAttribs::kNone) { | |
| if (!this->shouldUseDynamicStates(neededDynamicStates) || | |
| !op->shouldUseDynamicStates(neededDynamicStates)) { | |
| return CombineResult::kCannotCombine; | |
| } | |
| } | |
| fPatchAttribs = combinedAttribs; | |
| // 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>()); | |
| void StrokeTessellateOp::prePrepareTessellator(GrTessellationShader::ProgramArgs&& args, | |
| GrAppliedClip&& clip) { | |
| SkASSERT(!fTessellator); | |
| SkASSERT(!fFillProgram); | |
| SkASSERT(!fStencilProgram); | |
| // GrOp::setClippedBounds() should have been called by now. | |
| SkASSERT(SkRect::MakeIWH(args.fWriteView.width(), | |
| args.fWriteView.height()).contains(this->bounds())); | |
| const GrCaps& caps = *args.fCaps; | |
| SkArenaAlloc* arena = args.fArena; | |
| auto* pipeline = GrTessellationShader::MakePipeline(args, fAAType, std::move(clip), | |
| std::move(fProcessors)); | |
| GrStrokeTessellationShader::Mode shaderMode; | |
| int maxParametricSegments_log2; | |
| if (can_use_hardware_tessellation(fTotalCombinedVerbCnt, *pipeline, 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<StrokeHardwareTessellator>( | |
| fPatchAttribs, caps.shaderCaps()->maxTessellationSegments()); | |
| shaderMode = GrStrokeTessellationShader::Mode::kHardwareTessellation; | |
| // This sets a limit on the number of binary search iterations inside the shader, so we | |
| // round up to the next log2 to guarantee it makes enough. | |
| maxParametricSegments_log2 = SkNextLog2(caps.shaderCaps()->maxTessellationSegments()); | |
| } else { | |
| fTessellator = arena->make<StrokeFixedCountTessellator>(fPatchAttribs); | |
| shaderMode = GrStrokeTessellationShader::Mode::kFixedCount; | |
| maxParametricSegments_log2 = StrokeFixedCountTessellator::kMaxParametricSegments_log2; | |
| } | |
| fTessellationShader = args.fArena->make<GrStrokeTessellationShader>(*caps.shaderCaps(), | |
| shaderMode, | |
| fPatchAttribs, | |
| fViewMatrix, | |
| this->headStroke(), | |
| this->headColor(), | |
| maxParametricSegments_log2); | |
| auto fillStencil = &GrUserStencilSettings::kUnused; | |
| if (fNeedsStencil) { | |
| fStencilProgram = GrTessellationShader::MakeProgram(args, fTessellationShader, pipeline, | |
| &kMarkStencil); | |
| fillStencil = &kTestAndResetStencil; | |
| args.fXferBarrierFlags = GrXferBarrierFlags::kNone; | |
| } | |
| fFillProgram = GrTessellationShader::MakeProgram(args, fTessellationShader, pipeline, | |
| fillStencil); | |
| } | |
| void StrokeTessellateOp::onPrePrepare(GrRecordingContext* context, | |
| const GrSurfaceProxyView& writeView, GrAppliedClip* clip, | |
| const GrDstProxyView& dstProxyView, | |
| GrXferBarrierFlags renderPassXferBarriers, GrLoadOp | |
| colorLoadOp) { | |
| // DMSAA is not supported on DDL. | |
| bool usesMSAASurface = writeView.asRenderTargetProxy()->numSamples() > 1; | |
| this->prePrepareTessellator({context->priv().recordTimeAllocator(), writeView, usesMSAASurface, | |
| &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 StrokeTessellateOp::onPrepare(GrOpFlushState* flushState) { | |
| if (!fTessellator) { | |
| this->prePrepareTessellator({flushState->allocator(), flushState->writeView(), | |
| flushState->usesMSAASurface(), &flushState->dstProxyView(), | |
| flushState->renderPassBarriers(), flushState->colorLoadOp(), | |
| &flushState->caps()}, flushState->detachAppliedClip()); | |
| } | |
| SkASSERT(fTessellator); | |
| std::array<float, 2> matrixMinMaxScales; | |
| if (!fViewMatrix.getMinMaxScales(matrixMinMaxScales.data())) { | |
| matrixMinMaxScales.fill(1); | |
| } | |
| int fixedEdgeCount = fTessellator->prepare(flushState, | |
| fViewMatrix, | |
| matrixMinMaxScales, | |
| &fPathStrokeList, | |
| fTotalCombinedVerbCnt); | |
| if (!fTessellationShader->willUseTessellationShaders()) { | |
| fTessellationShader->setFixedCountNumTotalEdges(fixedEdgeCount); | |
| } | |
| } | |
| void StrokeTessellateOp::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); | |
| } | |
| } | |
| } // namespace skgpu::v1 |