| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef QuadPerEdgeAA_DEFINED |
| #define QuadPerEdgeAA_DEFINED |
| |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkPoint3.h" |
| #include "include/private/gpu/ganesh/GrTypesPriv.h" |
| #include "src/gpu/BufferWriter.h" |
| #include "src/gpu/ganesh/GrBuffer.h" |
| #include "src/gpu/ganesh/GrColor.h" |
| #include "src/gpu/ganesh/GrGeometryProcessor.h" |
| #include "src/gpu/ganesh/GrSamplerState.h" |
| #include "src/gpu/ganesh/geometry/GrQuad.h" |
| #include "src/gpu/ganesh/geometry/GrQuadUtils.h" |
| #include "src/gpu/ganesh/ops/TextureOp.h" |
| |
| class GrCaps; |
| class GrColorSpaceXform; |
| class GrMeshDrawTarget; |
| struct GrShaderCaps; |
| struct VertexWriter; |
| |
| namespace skgpu::ganesh::QuadPerEdgeAA { |
| using Saturate = skgpu::ganesh::TextureOp::Saturate; |
| |
| enum class CoverageMode { kNone, kWithPosition, kWithColor }; |
| enum class Subset : bool { kNo = false, kYes = true }; |
| enum class ColorType { kNone, kByte, kFloat, kLast = kFloat }; |
| static const int kColorTypeCount = static_cast<int>(ColorType::kLast) + 1; |
| |
| enum class IndexBufferOption { |
| kPictureFramed, // geometrically AA'd -> 8 verts/quad + an index buffer |
| kIndexedRects, // non-AA'd but indexed -> 4 verts/quad + an index buffer |
| kTriStrips, // non-AA'd -> 4 verts/quad but no index buffer |
| kLast = kTriStrips |
| }; |
| static const int kIndexBufferOptionCount = static_cast<int>(IndexBufferOption::kLast) + 1; |
| |
| IndexBufferOption CalcIndexBufferOption(GrAAType aa, int numQuads); |
| |
| // Gets the minimum ColorType that can represent a color. |
| ColorType MinColorType(SkPMColor4f); |
| |
| // Specifies the vertex configuration for an op that renders per-edge AA quads. The vertex |
| // order (when enabled) is device position, color, local position, subset, aa edge equations. |
| // This order matches the constructor argument order of VertexSpec and is the order that |
| // GPAttributes maintains. If hasLocalCoords is false, then the local quad type can be ignored. |
| struct VertexSpec { |
| public: |
| VertexSpec() |
| : fDeviceQuadType(0) // kAxisAligned |
| , fLocalQuadType(0) // kAxisAligned |
| , fIndexBufferOption(0) // kPictureFramed |
| , fHasLocalCoords(false) |
| , fColorType(0) // kNone |
| , fHasSubset(false) |
| , fUsesCoverageAA(false) |
| , fCompatibleWithCoverageAsAlpha(false) |
| , fRequiresGeometrySubset(false) {} |
| |
| VertexSpec(GrQuad::Type deviceQuadType, |
| ColorType colorType, |
| GrQuad::Type localQuadType, |
| bool hasLocalCoords, |
| Subset subset, |
| GrAAType aa, |
| bool coverageAsAlpha, |
| IndexBufferOption indexBufferOption) |
| : fDeviceQuadType(static_cast<unsigned>(deviceQuadType)) |
| , fLocalQuadType(static_cast<unsigned>(localQuadType)) |
| , fIndexBufferOption(static_cast<unsigned>(indexBufferOption)) |
| , fHasLocalCoords(hasLocalCoords) |
| , fColorType(static_cast<unsigned>(colorType)) |
| , fHasSubset(static_cast<unsigned>(subset)) |
| , fUsesCoverageAA(aa == GrAAType::kCoverage) |
| , fCompatibleWithCoverageAsAlpha(coverageAsAlpha) |
| , fRequiresGeometrySubset(aa == GrAAType::kCoverage && |
| deviceQuadType > GrQuad::Type::kRectilinear) {} |
| |
| GrQuad::Type deviceQuadType() const { return static_cast<GrQuad::Type>(fDeviceQuadType); } |
| GrQuad::Type localQuadType() const { return static_cast<GrQuad::Type>(fLocalQuadType); } |
| IndexBufferOption indexBufferOption() const { |
| return static_cast<IndexBufferOption>(fIndexBufferOption); |
| } |
| bool hasLocalCoords() const { return fHasLocalCoords; } |
| ColorType colorType() const { return static_cast<ColorType>(fColorType); } |
| bool hasVertexColors() const { return ColorType::kNone != this->colorType(); } |
| bool hasSubset() const { return fHasSubset; } |
| bool usesCoverageAA() const { return fUsesCoverageAA; } |
| bool compatibleWithCoverageAsAlpha() const { return fCompatibleWithCoverageAsAlpha; } |
| bool requiresGeometrySubset() const { return fRequiresGeometrySubset; } |
| // Will always be 2 or 3 |
| int deviceDimensionality() const; |
| // Will always be 0 if hasLocalCoords is false, otherwise will be 2 or 3 |
| int localDimensionality() const; |
| |
| int verticesPerQuad() const { return fUsesCoverageAA ? 8 : 4; } |
| |
| CoverageMode coverageMode() const; |
| size_t vertexSize() const; |
| |
| bool needsIndexBuffer() const { |
| return this->indexBufferOption() != IndexBufferOption::kTriStrips; |
| } |
| |
| GrPrimitiveType primitiveType() const { |
| switch (this->indexBufferOption()) { |
| case IndexBufferOption::kPictureFramed: |
| return GrPrimitiveType::kTriangles; |
| case IndexBufferOption::kIndexedRects: |
| return GrPrimitiveType::kTriangles; |
| case IndexBufferOption::kTriStrips: |
| return GrPrimitiveType::kTriangleStrip; |
| } |
| |
| SkUNREACHABLE; |
| } |
| |
| private: |
| static_assert(GrQuad::kTypeCount <= 4, "GrQuad::Type doesn't fit in 2 bits"); |
| static_assert(kColorTypeCount <= 4, "Color doesn't fit in 2 bits"); |
| static_assert(kIndexBufferOptionCount <= 4, "IndexBufferOption doesn't fit in 2 bits"); |
| |
| unsigned fDeviceQuadType : 2; |
| unsigned fLocalQuadType : 2; |
| unsigned fIndexBufferOption : 2; |
| unsigned fHasLocalCoords : 1; |
| unsigned fColorType : 2; |
| unsigned fHasSubset : 1; |
| unsigned fUsesCoverageAA : 1; |
| unsigned fCompatibleWithCoverageAsAlpha : 1; |
| // The geometry subset serves to clip off pixels touched by quads with sharp corners that |
| // would otherwise exceed the miter limit for the AA-outset geometry. |
| unsigned fRequiresGeometrySubset : 1; |
| }; |
| |
| // A Tessellator is responsible for processing a series of device+local GrQuads into a VBO, |
| // as specified by a VertexSpec. This vertex data can then be processed by a GP created with |
| // MakeProcessor and/or MakeTexturedProcessor. |
| class Tessellator { |
| public: |
| explicit Tessellator(const VertexSpec& spec, char* vertices); |
| |
| // Calculates (as needed) inset and outset geometry for anti-aliasing, and appends all |
| // necessary position and vertex attributes required by this Tessellator's VertexSpec into |
| // the 'vertices' the Tessellator was called with. The insetting and outsetting may |
| // damage the provided GrQuads (as this is intended to work with GrQuadBuffer::Iter). |
| // 'localQuad' can be null if the VertexSpec does not use local coords. |
| void append(GrQuad* deviceQuad, GrQuad* localQuad, |
| const SkPMColor4f& color, const SkRect& uvSubset, GrQuadAAFlags aaFlags); |
| |
| SkDEBUGCODE(skgpu::BufferWriter::Mark vertexMark() const { return fVertexWriter.mark(); }) |
| |
| private: |
| // VertexSpec defines many unique ways to write vertex attributes, which can be handled |
| // generically by branching per-quad based on the VertexSpec. However, there are several |
| // specs that appear in the wild far more frequently, so they use explicit WriteQuadProcs |
| // that have no branches. |
| typedef void (*WriteQuadProc)(VertexWriter* vertices, const VertexSpec& spec, |
| const GrQuad* deviceQuad, const GrQuad* localQuad, |
| const float coverage[4], const SkPMColor4f& color, |
| const SkRect& geomSubset, const SkRect& texSubset); |
| static WriteQuadProc GetWriteQuadProc(const VertexSpec& spec); |
| |
| GrQuadUtils::TessellationHelper fAAHelper; |
| VertexSpec fVertexSpec; |
| VertexWriter fVertexWriter; |
| WriteQuadProc fWriteProc; |
| }; |
| |
| GrGeometryProcessor* MakeProcessor(SkArenaAlloc*, const VertexSpec&); |
| |
| GrGeometryProcessor* MakeTexturedProcessor(SkArenaAlloc*, |
| const VertexSpec&, |
| const GrShaderCaps&, |
| const GrBackendFormat&, |
| GrSamplerState, |
| const skgpu::Swizzle&, |
| sk_sp<GrColorSpaceXform> textureColorSpaceXform, |
| Saturate); |
| |
| // This method will return the correct index buffer for the specified indexBufferOption. |
| // It will, correctly, return nullptr if the indexBufferOption is kTriStrips. |
| sk_sp<const GrBuffer> GetIndexBuffer(GrMeshDrawTarget*, IndexBufferOption); |
| |
| // What is the maximum number of quads allowed for the specified indexBuffer option? |
| int QuadLimit(IndexBufferOption); |
| |
| // This method will issue the draw call on the provided GrOpsRenderPass, as specified by the |
| // indexing method in vertexSpec. It is up to the calling code to allocate, fill in, and bind a |
| // vertex buffer, and to acquire and bind the correct index buffer (if needed) with |
| // GrPrimitiveRestart::kNo. |
| // |
| // @param runningQuadCount the number of quads already stored in 'vertexBuffer' and |
| // 'indexBuffer' e.g., different GrMeshes have already been placed in |
| // the buffers to allow dynamic state changes. |
| // @param quadCount the number of quads that will be drawn by the provided 'mesh'. |
| // A subsequent ConfigureMesh call would the use |
| // 'runningQuadCount' + 'quadCount' for its new 'runningQuadCount'. |
| void IssueDraw(const GrCaps&, GrOpsRenderPass*, const VertexSpec&, int runningQuadCount, |
| int quadCount, int maxVerts, int absVertBufferOffset); |
| |
| } // namespace skgpu::ganesh::QuadPerEdgeAA |
| |
| #endif // QuadPerEdgeAA_DEFINED |