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 "src/gpu/GrGeometryProcessor.h"
12
13/*
14 * A factory for creating default Geometry Processors which simply multiply position by the uniform
15 * view matrix and wire through color, coverage, UV coords if requested.
16 */
17namespace GrDefaultGeoProcFactory {
18 struct Color {
19 enum Type {
20 kPremulGrColorUniform_Type,
21 kPremulGrColorAttribute_Type,
22 kPremulWideColorAttribute_Type,
23 };
24 explicit Color(const SkPMColor4f& color)
25 : fType(kPremulGrColorUniform_Type)
26 , fColor(color) {}
27 Color(Type type)
28 : fType(type)
29 , fColor(SK_PMColor4fILLEGAL) {
30 SkASSERT(type != kPremulGrColorUniform_Type);
31 }
32
33 Type fType;
34 SkPMColor4f fColor;
35 };
36
37 struct Coverage {
38 enum Type {
39 kSolid_Type,
40 kUniform_Type,
41 kAttribute_Type,
42 kAttributeTweakAlpha_Type,
43 };
44 explicit Coverage(uint8_t coverage) : fType(kUniform_Type), fCoverage(coverage) {}
45 Coverage(Type type) : fType(type), fCoverage(0xff) {
46 SkASSERT(type != kUniform_Type);
47 }
48
49 Type fType;
50 uint8_t fCoverage;
51 };
52
53 struct LocalCoords {
54 enum Type {
55 kUnused_Type,
56 kUsePosition_Type,
57 kHasExplicit_Type,
58 };
59 LocalCoords(Type type) : fType(type), fMatrix(nullptr) {}
60 LocalCoords(Type type, const SkMatrix* matrix) : fType(type), fMatrix(matrix) {
61 SkASSERT(kUnused_Type != type);
62 }
63 bool hasLocalMatrix() const { return nullptr != fMatrix; }
64
65 Type fType;
66 const SkMatrix* fMatrix;
67 };
68
69 GrGeometryProcessor* Make(SkArenaAlloc*,
70 const Color&,
71 const Coverage&,
72 const LocalCoords&,
73 const SkMatrix& viewMatrix);
74
75 /*
76 * Use this factory to create a GrGeometryProcessor that expects a device space vertex position
77 * attribute. The view matrix must still be provided to compute correctly transformed
78 * coordinates for GrFragmentProcessors. It may fail if the view matrix is not invertible.
79 */
80 GrGeometryProcessor* MakeForDeviceSpace(SkArenaAlloc*,
81 const Color&,
82 const Coverage&,
83 const LocalCoords&,
84 const SkMatrix& viewMatrix);
85} // namespace GrDefaultGeoProcFactory
86
87#endif
88