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1 /* | 1 /* |
2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef GrTextureAccess_DEFINED | 8 #ifndef GrTextureAccess_DEFINED |
9 #define GrTextureAccess_DEFINED | 9 #define GrTextureAccess_DEFINED |
10 | 10 |
11 #include "GrGpuResourceRef.h" | 11 #include "GrGpuResourceRef.h" |
12 #include "GrTexture.h" | 12 #include "GrTexture.h" |
13 #include "GrTextureParams.h" | 13 #include "GrTextureParams.h" |
14 #include "SkRefCnt.h" | 14 #include "SkRefCnt.h" |
15 #include "SkShader.h" | 15 #include "SkShader.h" |
16 | 16 |
17 /** | 17 /** A class representing the swizzle access pattern for a texture. Note that if
the texture is |
18 * Used to represent a texture that is required by a GrProcessor. It holds a GrT
exture along with | 18 * an alpha-only texture then the alpha channel is substituted for other compon
ents. Any mangling |
19 * an associated GrTextureParams | 19 * to handle the r,g,b->a conversions for alpha textures is automatically inclu
ded in the stage |
| 20 * key. However, if a GrProcessor uses different swizzles based on its input th
en it must |
| 21 * consider that variation in its key-generation. |
20 */ | 22 */ |
21 class GrTextureAccess : public SkNoncopyable { | 23 class GrTextureAccess : public SkNoncopyable { |
22 public: | 24 public: |
23 /** | 25 /** |
24 * Must be initialized before adding to a GrProcessor's texture access list. | 26 * A default GrTextureAccess must have reset() called on it in a GrProcessor
subclass's |
| 27 * constructor if it will be accessible via GrProcessor::textureAccess(). |
25 */ | 28 */ |
26 GrTextureAccess(); | 29 GrTextureAccess(); |
27 | 30 |
| 31 /** |
| 32 * Uses the default swizzle, "rgba". |
| 33 */ |
28 GrTextureAccess(GrTexture*, const GrTextureParams&); | 34 GrTextureAccess(GrTexture*, const GrTextureParams&); |
29 | |
30 explicit GrTextureAccess(GrTexture*, | 35 explicit GrTextureAccess(GrTexture*, |
31 GrTextureParams::FilterMode = GrTextureParams::kNon
e_FilterMode, | 36 GrTextureParams::FilterMode = GrTextureParams::kNon
e_FilterMode, |
32 SkShader::TileMode tileXAndY = SkShader::kClamp_Til
eMode); | 37 SkShader::TileMode tileXAndY = SkShader::kClamp_Til
eMode); |
33 | 38 |
| 39 /** |
| 40 * swizzle must be a string between one and four (inclusive) characters cont
aining only 'r', |
| 41 * 'g', 'b', and/or 'a'. |
| 42 */ |
| 43 GrTextureAccess(GrTexture*, const char* swizzle, const GrTextureParams&); |
| 44 GrTextureAccess(GrTexture*, |
| 45 const char* swizzle, |
| 46 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterM
ode, |
| 47 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); |
| 48 |
34 void reset(GrTexture*, const GrTextureParams&); | 49 void reset(GrTexture*, const GrTextureParams&); |
35 void reset(GrTexture*, | 50 void reset(GrTexture*, |
36 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode, | 51 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode, |
37 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); | 52 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); |
| 53 void reset(GrTexture*, const char* swizzle, const GrTextureParams&); |
| 54 void reset(GrTexture*, |
| 55 const char* swizzle, |
| 56 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode, |
| 57 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); |
38 | 58 |
39 bool operator==(const GrTextureAccess& that) const { | 59 bool operator== (const GrTextureAccess& other) const { |
40 return this->getTexture() == that.getTexture() && fParams == that.fParam
s; | 60 #ifdef SK_DEBUG |
| 61 // below assumes all chars in fSwizzle are initialized even if string is
< 4 chars long. |
| 62 SkASSERT(memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1) == |
| 63 strcmp(fSwizzle, other.fSwizzle)); |
| 64 #endif |
| 65 return fParams == other.fParams && |
| 66 (this->getTexture() == other.getTexture()) && |
| 67 (0 == memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1)); |
41 } | 68 } |
42 | 69 |
43 bool operator!=(const GrTextureAccess& other) const { return !(*this == othe
r); } | 70 bool operator!= (const GrTextureAccess& other) const { return !(*this == oth
er); } |
44 | 71 |
45 GrTexture* getTexture() const { return fTexture.get(); } | 72 GrTexture* getTexture() const { return fTexture.get(); } |
46 | 73 |
47 /** | 74 /** |
48 * For internal use by GrProcessor. | 75 * For internal use by GrProcessor. |
49 */ | 76 */ |
50 const GrGpuResourceRef* getProgramTexture() const { return &fTexture; } | 77 const GrGpuResourceRef* getProgramTexture() const { return &fTexture; } |
51 | 78 |
| 79 /** |
| 80 * Returns a string representing the swizzle. The string is is null-terminat
ed. |
| 81 */ |
| 82 const char* getSwizzle() const { return fSwizzle; } |
| 83 |
| 84 /** Returns a mask indicating which components are referenced in the swizzle
. The return |
| 85 is a bitfield of GrColorComponentFlags. */ |
| 86 uint32_t swizzleMask() const { return fSwizzleMask; } |
| 87 |
52 const GrTextureParams& getParams() const { return fParams; } | 88 const GrTextureParams& getParams() const { return fParams; } |
53 | 89 |
54 private: | 90 private: |
| 91 void setSwizzle(const char*); |
55 | 92 |
56 typedef GrTGpuResourceRef<GrTexture> ProgramTexture; | 93 typedef GrTGpuResourceRef<GrTexture> ProgramTexture; |
57 | 94 |
58 ProgramTexture fTexture; | 95 ProgramTexture fTexture; |
59 GrTextureParams fParams; | 96 GrTextureParams fParams; |
| 97 uint32_t fSwizzleMask; |
| 98 char fSwizzle[5]; |
60 | 99 |
61 typedef SkNoncopyable INHERITED; | 100 typedef SkNoncopyable INHERITED; |
62 }; | 101 }; |
63 | 102 |
64 #endif | 103 #endif |
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