| /* |
| * Copyright 2020 Google LLC. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrStrokeHardwareTessellator_DEFINED |
| #define GrStrokeHardwareTessellator_DEFINED |
| |
| #include "include/core/SkStrokeRec.h" |
| #include "src/gpu/GrVertexWriter.h" |
| #include "src/gpu/tessellate/GrStrokeTessellateOp.h" |
| #include "src/gpu/tessellate/GrStrokeTessellateShader.h" |
| |
| // Renders opaque, constant-color strokes by decomposing them into standalone tessellation patches. |
| // Each patch is either a "cubic" (single stroked bezier curve with butt caps) or a "join". Requires |
| // MSAA if antialiasing is desired. |
| class GrStrokeHardwareTessellator : public GrStrokeTessellator { |
| public: |
| // We generate and store patch buffers in chunks. Normally there will only be one chunk, but in |
| // rare cases the first can run out of space if too many cubics needed to be subdivided. |
| struct PatchChunk { |
| sk_sp<const GrBuffer> fPatchBuffer; |
| int fPatchCount = 0; |
| int fBasePatch; |
| }; |
| |
| GrStrokeHardwareTessellator(ShaderFlags shaderFlags, PathStrokeList* pathStrokeList, |
| int totalCombinedVerbCnt, const GrShaderCaps& shaderCaps) |
| : GrStrokeTessellator(shaderFlags, std::move(pathStrokeList)) |
| , fTotalCombinedVerbCnt(totalCombinedVerbCnt) { |
| } |
| |
| void prepare(GrMeshDrawOp::Target*, const SkMatrix&) override; |
| void draw(GrOpFlushState*) const override; |
| |
| private: |
| // The combined number of path verbs from all paths in fPathStrokeList. |
| const int fTotalCombinedVerbCnt; |
| |
| SkSTArray<1, PatchChunk> fPatchChunks; |
| |
| friend class GrOp; // For ctor. |
| |
| public: |
| // This class is used to benchmark prepareBuffers(). |
| class TestingOnly_Benchmark; |
| }; |
| |
| #endif |