| /* |
| * Copyright 2019 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/gpu/ccpr/GrStencilAtlasOp.h" |
| |
| #include "include/gpu/GrRecordingContext.h" |
| #include "src/gpu/GrOpFlushState.h" |
| #include "src/gpu/GrOpsRenderPass.h" |
| #include "src/gpu/GrProgramInfo.h" |
| #include "src/gpu/GrRecordingContextPriv.h" |
| #include "src/gpu/ccpr/GrCCPerFlushResources.h" |
| #include "src/gpu/ccpr/GrSampleMaskProcessor.h" |
| #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h" |
| |
| namespace { |
| |
| class StencilResolveProcessor : public GrGeometryProcessor { |
| public: |
| StencilResolveProcessor() : INHERITED(kStencilResolveProcessor_ClassID) { |
| static constexpr Attribute kIBounds = { |
| "ibounds", kShort4_GrVertexAttribType, kShort4_GrSLType}; |
| this->setInstanceAttributes(&kIBounds, 1); |
| SkASSERT(this->instanceStride() == sizeof(GrStencilAtlasOp::ResolveRectInstance)); |
| } |
| |
| private: |
| const char* name() const final { return "StencilResolveProcessor"; } |
| void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const final {} |
| GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const final; |
| class Impl; |
| |
| using INHERITED = GrGeometryProcessor; |
| }; |
| |
| // This processor draws pixel-aligned rectangles directly on top of every path in the atlas. |
| // The caller should have set up the instance data such that "Nonzero" paths get clockwise |
| // rectangles (l < r) and "even/odd" paths get counter-clockwise (r < l). Its purpose |
| // is to convert winding counts in the stencil buffer to A8 coverage in the color buffer. |
| class StencilResolveProcessor::Impl : public GrGLSLGeometryProcessor { |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override { |
| args.fVaryingHandler->emitAttributes(args.fGP.cast<StencilResolveProcessor>()); |
| |
| GrGLSLVertexBuilder* v = args.fVertBuilder; |
| v->codeAppendf("short2 devcoord;"); |
| v->codeAppendf("devcoord.x = (0 == (sk_VertexID & 1)) ? ibounds.x : ibounds.z;"); |
| v->codeAppendf("devcoord.y = (sk_VertexID < 2) ? ibounds.y : ibounds.w;"); |
| |
| v->codeAppendf("float2 atlascoord = float2(devcoord);"); |
| gpArgs->fPositionVar.set(kFloat2_GrSLType, "atlascoord"); |
| |
| // Just output "1" for coverage. This will be modulated by the MSAA stencil test. |
| GrGLSLFPFragmentBuilder* f = args.fFragBuilder; |
| f->codeAppendf("%s = %s = half4(1);", args.fOutputColor, args.fOutputCoverage); |
| } |
| |
| void setData(const GrGLSLProgramDataManager&, const GrPrimitiveProcessor&) override {} |
| }; |
| |
| GrGLSLPrimitiveProcessor* StencilResolveProcessor::createGLSLInstance(const GrShaderCaps&) const { |
| return new Impl(); |
| } |
| |
| } // namespace |
| |
| GrOp::Owner GrStencilAtlasOp::Make( |
| GrRecordingContext* context, sk_sp<const GrCCPerFlushResources> resources, |
| FillBatchID fillBatchID, StrokeBatchID strokeBatchID, int baseStencilResolveInstance, |
| int endStencilResolveInstance, const SkISize& drawBounds) { |
| |
| return GrOp::Make<GrStencilAtlasOp>( |
| context, std::move(resources), fillBatchID, strokeBatchID, baseStencilResolveInstance, |
| endStencilResolveInstance, drawBounds); |
| } |
| |
| // Increments clockwise triangles and decrements counterclockwise. We use the same incr/decr |
| // settings regardless of fill rule; fill rule is accounted for during the resolve step. |
| static constexpr GrUserStencilSettings kIncrDecrStencil( |
| GrUserStencilSettings::StaticInitSeparate< |
| 0x0000, 0x0000, |
| GrUserStencilTest::kNever, GrUserStencilTest::kNever, |
| 0xffff, 0xffff, |
| GrUserStencilOp::kIncWrap, GrUserStencilOp::kDecWrap, |
| GrUserStencilOp::kIncWrap, GrUserStencilOp::kDecWrap, |
| 0xffff, 0xffff>() |
| ); |
| |
| // Resolves stencil winding counts to A8 coverage. Leaves stencil values untouched. |
| // NOTE: For the CCW face we intentionally use "1 == (stencil & 1)" because the contrapositive logic |
| // (i.e. 0 != ...) causes bugs on Adreno Vulkan. http://skbug.com/9643 |
| static constexpr GrUserStencilSettings kResolveStencilCoverage( |
| GrUserStencilSettings::StaticInitSeparate< |
| 0x0000, 0x0001, |
| GrUserStencilTest::kNotEqual, GrUserStencilTest::kEqual, |
| 0xffff, 0x0001, |
| GrUserStencilOp::kKeep, GrUserStencilOp::kKeep, |
| GrUserStencilOp::kKeep, GrUserStencilOp::kKeep, |
| 0xffff, 0xffff>() |
| ); |
| |
| // Same as above, but also resets stencil values to zero. This is better for non-tilers |
| // where we prefer to not clear the stencil buffer at the beginning of every render pass. |
| static constexpr GrUserStencilSettings kResolveStencilCoverageAndReset( |
| GrUserStencilSettings::StaticInitSeparate< |
| 0x0000, 0x0000, |
| GrUserStencilTest::kNotEqual, GrUserStencilTest::kNotEqual, |
| 0xffff, 0x0001, |
| GrUserStencilOp::kZero, GrUserStencilOp::kZero, |
| GrUserStencilOp::kKeep, GrUserStencilOp::kZero, |
| 0xffff, 0xffff>() |
| ); |
| |
| // Same as above, but done in two passes for D3D, which doesn't support mismatched refs or masks on |
| // dual sided stencil settings. |
| static constexpr GrUserStencilSettings kResolveWindingCoverageAndReset( |
| GrUserStencilSettings::StaticInitSeparate< |
| 0x0000, 0x0000, |
| GrUserStencilTest::kNotEqual, GrUserStencilTest::kNever, |
| 0xffff, 0xffff, |
| GrUserStencilOp::kZero, GrUserStencilOp::kKeep, |
| GrUserStencilOp::kKeep, GrUserStencilOp::kKeep, |
| 0xffff, 0xffff>() |
| ); |
| static constexpr GrUserStencilSettings kResolveEvenOddCoverageAndReset( |
| GrUserStencilSettings::StaticInitSeparate< |
| 0x0000, 0x0000, |
| GrUserStencilTest::kNever, GrUserStencilTest::kNotEqual, |
| 0x0001, 0x0001, |
| GrUserStencilOp::kKeep, GrUserStencilOp::kZero, |
| GrUserStencilOp::kKeep, GrUserStencilOp::kZero, |
| 0xffff, 0xffff>() |
| ); |
| |
| |
| void GrStencilAtlasOp::onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) { |
| SkIRect drawBoundsRect = SkIRect::MakeWH(fDrawBounds.width(), fDrawBounds.height()); |
| |
| GrPipeline pipeline(GrScissorTest::kEnabled, GrDisableColorXPFactory::MakeXferProcessor(), |
| flushState->drawOpArgs().writeView().swizzle(), |
| GrPipeline::InputFlags::kHWAntialias); |
| |
| GrSampleMaskProcessor sampleMaskProc; |
| |
| fResources->filler().drawFills( |
| flushState, &sampleMaskProc, pipeline, fFillBatchID, drawBoundsRect, &kIncrDecrStencil); |
| |
| // We resolve the stencil coverage to alpha by drawing pixel-aligned boxes. Fine raster is |
| // not necessary, and will even cause artifacts if using mixed samples. |
| constexpr auto noHWAA = GrPipeline::InputFlags::kNone; |
| |
| GrPipeline resolvePipeline(GrScissorTest::kEnabled, SkBlendMode::kSrc, |
| flushState->drawOpArgs().writeView().swizzle(), noHWAA); |
| StencilResolveProcessor primProc; |
| |
| if (!flushState->caps().twoSidedStencilRefsAndMasksMustMatch()) { |
| const GrUserStencilSettings* stencil = |
| (flushState->caps().discardStencilValuesAfterRenderPass()) ? |
| &kResolveStencilCoverage : &kResolveStencilCoverageAndReset; |
| this->drawResolve(flushState, resolvePipeline, stencil, primProc, drawBoundsRect); |
| return; |
| } |
| |
| // If this ever becomes true then we should add new per-fill-type stencil settings that also |
| // don't reset back to zero. |
| SkASSERT(!flushState->caps().discardStencilValuesAfterRenderPass()); |
| |
| this->drawResolve(flushState, resolvePipeline, &kResolveWindingCoverageAndReset, primProc, |
| drawBoundsRect); |
| this->drawResolve(flushState, resolvePipeline, &kResolveEvenOddCoverageAndReset, primProc, |
| drawBoundsRect); |
| } |
| |
| void GrStencilAtlasOp::drawResolve(GrOpFlushState* flushState, const GrPipeline& resolvePipeline, |
| const GrUserStencilSettings* stencil, |
| const GrPrimitiveProcessor& primProc, |
| const SkIRect& drawBounds) const { |
| GrProgramInfo programInfo(flushState->writeView(), &resolvePipeline, stencil, |
| &primProc, GrPrimitiveType::kTriangleStrip, 0, |
| flushState->renderPassBarriers(), |
| flushState->colorLoadOp()); |
| flushState->bindPipeline(programInfo, SkRect::Make(drawBounds)); |
| flushState->setScissorRect(drawBounds); |
| flushState->bindBuffers(nullptr, fResources->stencilResolveBuffer(), nullptr); |
| flushState->drawInstanced(fEndStencilResolveInstance - fBaseStencilResolveInstance, |
| fBaseStencilResolveInstance, 4, 0); |
| } |