1 /*
2  * Copyright 2014 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 GrDefaultGeoProcFactory_DEFINED
9 #define GrDefaultGeoProcFactory_DEFINED
10 
11 #include "GrColorSpaceXform.h"
12 #include "GrGeometryProcessor.h"
13 #include "GrShaderCaps.h"
14 
15 constexpr int kMaxBones = 80; // Supports up to 80 bones per mesh.
16 
17 /*
18  * A factory for creating default Geometry Processors which simply multiply position by the uniform
19  * view matrix and wire through color, coverage, UV coords if requested.
20  */
21 namespace GrDefaultGeoProcFactory {
22     struct Color {
23         enum Type {
24             kPremulGrColorUniform_Type,
25             kPremulGrColorAttribute_Type,
26             kPremulWideColorAttribute_Type,
27             kUnpremulSkColorAttribute_Type,
28         };
29         explicit Color(const SkPMColor4f& color)
30                 : fType(kPremulGrColorUniform_Type)
31                 , fColor(color)
32                 , fColorSpaceXform(nullptr) {}
33         Color(Type type)
34                 : fType(type)
35                 , fColor(SK_PMColor4fILLEGAL)
36                 , fColorSpaceXform(nullptr) {
37             SkASSERT(type != kPremulGrColorUniform_Type);
38         }
39 
40         Type fType;
41         SkPMColor4f fColor;
42 
43         // This only applies to SkColor. Any GrColors are assumed to have been color converted
44         // during paint conversion.
45         sk_sp<GrColorSpaceXform> fColorSpaceXform;
46     };
47 
48     struct Coverage {
49         enum Type {
50             kSolid_Type,
51             kUniform_Type,
52             kAttribute_Type,
53             kAttributeTweakAlpha_Type,
54         };
55         explicit Coverage(uint8_t coverage) : fType(kUniform_Type), fCoverage(coverage) {}
56         Coverage(Type type) : fType(type), fCoverage(0xff) {
57             SkASSERT(type != kUniform_Type);
58         }
59 
60         Type fType;
61         uint8_t fCoverage;
62     };
63 
64     struct LocalCoords {
65         enum Type {
66             kUnused_Type,
67             kUsePosition_Type,
68             kHasExplicit_Type,
69             kHasTransformed_Type,
70         };
71         LocalCoords(Type type) : fType(type), fMatrix(nullptr) {}
72         LocalCoords(Type type, const SkMatrix* matrix) : fType(type), fMatrix(matrix) {
73             SkASSERT(kUnused_Type != type);
74         }
75         bool hasLocalMatrix() const { return nullptr != fMatrix; }
76 
77         Type fType;
78         const SkMatrix* fMatrix;
79     };
80 
81     struct Bones {
82         Bones(const float bones[], int boneCount)
83             : fBones(bones)
84             , fBoneCount(boneCount) {}
85 
86         const float* fBones;
87         int fBoneCount;
88     };
89 
90     sk_sp<GrGeometryProcessor> Make(const GrShaderCaps*,
91                                     const Color&,
92                                     const Coverage&,
93                                     const LocalCoords&,
94                                     const SkMatrix& viewMatrix);
95 
96     /*
97      * Use this factory to create a GrGeometryProcessor that expects a device space vertex position
98      * attribute. The view matrix must still be provided to compute correctly transformed
99      * coordinates for GrFragmentProcessors. It may fail if the view matrix is not invertible.
100      */
101     sk_sp<GrGeometryProcessor> MakeForDeviceSpace(const GrShaderCaps*,
102                                                   const Color&,
103                                                   const Coverage&,
104                                                   const LocalCoords&,
105                                                   const SkMatrix& viewMatrix);
106 
107     /*
108      * Use this factory to create a GrGeometryProcessor that supports skeletal animation through
109      * deformation of vertices using matrices that are passed in. This should only be called from
110      * GrDrawVerticesOp.
111      */
112     sk_sp<GrGeometryProcessor> MakeWithBones(const GrShaderCaps*,
113                                              const Color&,
114                                              const Coverage&,
115                                              const LocalCoords&,
116                                              const Bones&,
117                                              const SkMatrix& viewMatrix);
118 };
119 
120 #endif
121