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
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrTextureAccess_DEFINED
#define GrTextureAccess_DEFINED
#include "GrGpuResourceRef.h"
#include "GrTexture.h"
#include "GrTextureParams.h"
#include "SkRefCnt.h"
#include "SkShader.h"
/** A class representing the swizzle access pattern for a texture. Note that if the texture is
* an alpha-only texture then the alpha channel is substituted for other components. Any mangling
* to handle the r,g,b->a conversions for alpha textures is automatically included in the stage
* key. However, if a GrProcessor uses different swizzles based on its input then it must
* consider that variation in its key-generation.
*/
class GrTextureAccess : public SkNoncopyable {
public:
/**
* A default GrTextureAccess must have reset() called on it in a GrProcessor subclass's
* constructor if it will be accessible via GrProcessor::textureAccess().
*/
GrTextureAccess();
/**
* Uses the default swizzle, "rgba".
*/
GrTextureAccess(GrTexture*, const GrTextureParams&);
explicit GrTextureAccess(GrTexture*,
GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
/**
* swizzle must be a string between one and four (inclusive) characters containing only 'r',
* 'g', 'b', and/or 'a'.
*/
GrTextureAccess(GrTexture*, const char* swizzle, const GrTextureParams&);
GrTextureAccess(GrTexture*,
const char* swizzle,
GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
void reset(GrTexture*, const GrTextureParams&);
void reset(GrTexture*,
GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
void reset(GrTexture*, const char* swizzle, const GrTextureParams&);
void reset(GrTexture*,
const char* swizzle,
GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
bool operator== (const GrTextureAccess& other) const {
#ifdef SK_DEBUG
// below assumes all chars in fSwizzle are initialized even if string is < 4 chars long.
SkASSERT(memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1) ==
strcmp(fSwizzle, other.fSwizzle));
#endif
return fParams == other.fParams &&
(this->getTexture() == other.getTexture()) &&
(0 == memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1));
}
bool operator!= (const GrTextureAccess& other) const { return !(*this == other); }
GrTexture* getTexture() const { return fTexture.get(); }
/**
* For internal use by GrProcessor.
*/
const GrGpuResourceRef* getProgramTexture() const { return &fTexture; }
/**
* Returns a string representing the swizzle. The string is is null-terminated.
*/
const char* getSwizzle() const { return fSwizzle; }
/** Returns a mask indicating which components are referenced in the swizzle. The return
is a bitfield of GrColorComponentFlags. */
uint32_t swizzleMask() const { return fSwizzleMask; }
const GrTextureParams& getParams() const { return fParams; }
private:
void setSwizzle(const char*);
typedef GrTGpuResourceRef<GrTexture> ProgramTexture;
ProgramTexture fTexture;
GrTextureParams fParams;
uint32_t fSwizzleMask;
char fSwizzle[5];
typedef SkNoncopyable INHERITED;
};
#endif
|
