1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLSLGeometryProcessor_DEFINED
#define GrGLSLGeometryProcessor_DEFINED
#include "GrGLSLPrimitiveProcessor.h"
class GrGLSLGPBuilder;
/**
* If a GL effect needs a GrGLFullShaderBuilder* object to emit vertex code, then it must inherit
* from this class. Since paths don't have vertices, this class is only meant to be used internally
* by skia, for special cases.
*/
class GrGLSLGeometryProcessor : public GrGLSLPrimitiveProcessor {
public:
/* Any general emit code goes in the base class emitCode. Subclasses override onEmitCode */
void emitCode(EmitArgs&) override;
// By default we use the identity matrix
void setTransformData(const GrPrimitiveProcessor&,
const GrGLSLProgramDataManager& pdman,
int index,
const SkTArray<const GrCoordTransform*, true>& transforms) override {
this->setTransformDataHelper(SkMatrix::I(), pdman, index, transforms);
}
protected:
// A helper which subclasses can use if needed and used above in the default setTransformData().
void setTransformDataHelper(const SkMatrix& localMatrix,
const GrGLSLProgramDataManager& pdman,
int index,
const SkTArray<const GrCoordTransform*, true>& transforms) {
SkSTArray<2, UniformTransform, true>& procTransforms = fInstalledTransforms[index];
int numTransforms = transforms.count();
for (int t = 0; t < numTransforms; ++t) {
SkASSERT(procTransforms[t].fHandle.isValid());
const SkMatrix& transform = GetTransformMatrix(localMatrix, *transforms[t]);
if (!procTransforms[t].fCurrentValue.cheapEqualTo(transform)) {
pdman.setSkMatrix(procTransforms[t].fHandle.toIndex(), transform);
procTransforms[t].fCurrentValue = transform;
}
}
}
// Emit a uniform matrix for each coord transform.
void emitTransforms(GrGLSLVertexBuilder* vb,
GrGLSLVaryingHandler* varyingHandler,
GrGLSLUniformHandler* uniformHandler,
const GrShaderVar& posVar,
const char* localCoords,
const TransformsIn& tin,
TransformsOut* tout) {
this->emitTransforms(vb, varyingHandler, uniformHandler,
posVar, localCoords, SkMatrix::I(), tin, tout);
}
// Emit pre-transformed coords as a vertex attribute per coord-transform.
void emitTransforms(GrGLSLVertexBuilder*,
GrGLSLVaryingHandler*,
GrGLSLUniformHandler*,
const GrShaderVar& posVar,
const char* localCoords,
const SkMatrix& localMatrix,
const TransformsIn&,
TransformsOut*);
// caller has emitted transforms via attributes
void emitTransforms(GrGLSLVertexBuilder*,
GrGLSLVaryingHandler*,
const char* localCoords,
const TransformsIn& tin,
TransformsOut* tout);
struct GrGPArgs {
// The variable used by a GP to store its position. It can be
// either a vec2 or a vec3 depending on the presence of perspective.
GrShaderVar fPositionVar;
};
// Create the correct type of position variable given the CTM
void setupPosition(GrGLSLVertexBuilder*, GrGPArgs*, const char* posName);
void setupPosition(GrGLSLVertexBuilder*,
GrGLSLUniformHandler* uniformHandler,
GrGPArgs*,
const char* posName,
const SkMatrix& mat,
UniformHandle* viewMatrixUniform);
static uint32_t ComputePosKey(const SkMatrix& mat) {
if (mat.isIdentity()) {
return 0x0;
} else if (!mat.hasPerspective()) {
return 0x01;
} else {
return 0x02;
}
}
private:
virtual void onEmitCode(EmitArgs&, GrGPArgs*) = 0;
struct UniformTransform : public Transform {
UniformTransform() : Transform() {}
UniformHandle fHandle;
};
SkSTArray<8, SkSTArray<2, UniformTransform, true> > fInstalledTransforms;
typedef GrGLSLPrimitiveProcessor INHERITED;
};
#endif
|
