1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrQuadPerEdgeAA_DEFINED 9 #define GrQuadPerEdgeAA_DEFINED 10 11 #include "GrColor.h" 12 #include "GrGeometryProcessor.h" 13 #include "GrMeshDrawOp.h" 14 #include "GrQuad.h" 15 #include "GrSamplerState.h" 16 #include "GrTypesPriv.h" 17 #include "SkPoint.h" 18 #include "SkPoint3.h" 19 20 class GrColorSpaceXform; 21 class GrShaderCaps; 22 23 namespace GrQuadPerEdgeAA { 24 25 enum class Domain : bool { kNo = false, kYes = true }; 26 enum class ColorType { kNone, kByte, kHalf, kLast = kHalf }; 27 static const int kColorTypeCount = static_cast<int>(ColorType::kLast) + 1; 28 29 // Specifies the vertex configuration for an op that renders per-edge AA quads. The vertex 30 // order (when enabled) is device position, color, local position, domain, aa edge equations. 31 // This order matches the constructor argument order of VertexSpec and is the order that 32 // GPAttributes maintains. If hasLocalCoords is false, then the local quad type can be ignored. 33 struct VertexSpec { 34 public: 35 VertexSpec(GrQuadType deviceQuadType, ColorType colorType, GrQuadType localQuadType, 36 bool hasLocalCoords, Domain domain, GrAAType aa, bool alphaAsCoverage) 37 : fDeviceQuadType(static_cast<unsigned>(deviceQuadType)) 38 , fLocalQuadType(static_cast<unsigned>(localQuadType)) 39 , fHasLocalCoords(hasLocalCoords) 40 , fColorType(static_cast<unsigned>(colorType)) 41 , fHasDomain(static_cast<unsigned>(domain)) 42 , fUsesCoverageAA(aa == GrAAType::kCoverage) 43 , fCompatibleWithAlphaAsCoverage(alphaAsCoverage) { } 44 45 GrQuadType deviceQuadType() const { return static_cast<GrQuadType>(fDeviceQuadType); } 46 GrQuadType localQuadType() const { return static_cast<GrQuadType>(fLocalQuadType); } 47 bool hasLocalCoords() const { return fHasLocalCoords; } 48 ColorType colorType() const { return static_cast<ColorType>(fColorType); } 49 bool hasVertexColors() const { return ColorType::kNone != this->colorType(); } 50 bool hasDomain() const { return fHasDomain; } 51 bool usesCoverageAA() const { return fUsesCoverageAA; } 52 bool compatibleWithAlphaAsCoverage() const { return fCompatibleWithAlphaAsCoverage; } 53 54 // Will always be 2 or 3 55 int deviceDimensionality() const; 56 // Will always be 0 if hasLocalCoords is false, otherwise will be 2 or 3 57 int localDimensionality() const; 58 59 int verticesPerQuad() const { return fUsesCoverageAA ? 8 : 4; } 60 private: 61 static_assert(kGrQuadTypeCount <= 4, "GrQuadType doesn't fit in 2 bits"); 62 static_assert(kColorTypeCount <= 4, "Color doesn't fit in 2 bits"); 63 64 unsigned fDeviceQuadType: 2; 65 unsigned fLocalQuadType: 2; 66 unsigned fHasLocalCoords: 1; 67 unsigned fColorType : 2; 68 unsigned fHasDomain: 1; 69 unsigned fUsesCoverageAA: 1; 70 unsigned fCompatibleWithAlphaAsCoverage: 1; 71 }; 72 73 sk_sp<GrGeometryProcessor> MakeProcessor(const VertexSpec& spec); 74 75 sk_sp<GrGeometryProcessor> MakeTexturedProcessor(const VertexSpec& spec, 76 const GrShaderCaps& caps, GrTextureType textureType, GrPixelConfig textureConfig, 77 const GrSamplerState& samplerState, uint32_t extraSamplerKey, 78 sk_sp<GrColorSpaceXform> textureColorSpaceXform); 79 80 // Fill vertices with the vertex data needed to represent the given quad. The device position, 81 // local coords, vertex color, domain, and edge coefficients will be written and/or computed 82 // based on the configuration in the vertex spec; if that attribute is disabled in the spec, 83 // then its corresponding function argument is ignored. 84 // 85 // Returns the advanced pointer in vertices. 86 void* Tessellate(void* vertices, const VertexSpec& spec, const GrPerspQuad& deviceQuad, 87 const SkPMColor4f& color, const GrPerspQuad& localQuad, const SkRect& domain, 88 GrQuadAAFlags aa); 89 90 // The mesh will have its index data configured to meet the expectations of the Tessellate() 91 // function, but it the calling code must handle filling a vertex buffer via Tessellate() and 92 // then assigning it to the returned mesh. 93 // 94 // Returns false if the index data could not be allocated. 95 bool ConfigureMeshIndices(GrMeshDrawOp::Target* target, GrMesh* mesh, const VertexSpec& spec, 96 int quadCount); 97 98 static constexpr int kNumAAQuadsInIndexBuffer = 512; 99 100 } // namespace GrQuadPerEdgeAA 101 102 #endif // GrQuadPerEdgeAA_DEFINED 103