2 * Copyright 2012 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef GrTextureAccess_DEFINED
9 #define GrTextureAccess_DEFINED
11 #include "GrGpuResourceRef.h"
12 #include "GrTexture.h"
17 * Represents the filtering and tile modes used to access a texture. It is mostly used with
18 * GrTextureAccess (defined below). Also, some of the texture cache methods require knowledge about
19 * filtering and tiling to perform a cache lookup. If it wasn't for this latter usage this would
20 * be folded into GrTextureAccess. The default is clamp tile modes and no filtering.
22 class GrTextureParams {
34 GrTextureParams(SkShader::TileMode tileXAndY, FilterMode filterMode) {
35 this->reset(tileXAndY, filterMode);
38 GrTextureParams(const SkShader::TileMode tileModes[2], FilterMode filterMode) {
39 this->reset(tileModes, filterMode);
42 GrTextureParams(const GrTextureParams& params) {
46 GrTextureParams& operator= (const GrTextureParams& params) {
47 fTileModes[0] = params.fTileModes[0];
48 fTileModes[1] = params.fTileModes[1];
49 fFilterMode = params.fFilterMode;
54 this->reset(SkShader::kClamp_TileMode, kNone_FilterMode);
57 void reset(SkShader::TileMode tileXAndY, FilterMode filterMode) {
58 fTileModes[0] = fTileModes[1] = tileXAndY;
59 fFilterMode = filterMode;
62 void reset(const SkShader::TileMode tileModes[2], FilterMode filterMode) {
63 fTileModes[0] = tileModes[0];
64 fTileModes[1] = tileModes[1];
65 fFilterMode = filterMode;
68 void setClampNoFilter() {
69 fTileModes[0] = fTileModes[1] = SkShader::kClamp_TileMode;
70 fFilterMode = kNone_FilterMode;
74 fTileModes[0] = fTileModes[1] = SkShader::kClamp_TileMode;
77 void setFilterMode(FilterMode filterMode) { fFilterMode = filterMode; }
79 void setTileModeX(const SkShader::TileMode tm) { fTileModes[0] = tm; }
80 void setTileModeY(const SkShader::TileMode tm) { fTileModes[1] = tm; }
81 void setTileModeXAndY(const SkShader::TileMode tm) { fTileModes[0] = fTileModes[1] = tm; }
83 SkShader::TileMode getTileModeX() const { return fTileModes[0]; }
85 SkShader::TileMode getTileModeY() const { return fTileModes[1]; }
87 bool isTiled() const {
88 return SkShader::kClamp_TileMode != fTileModes[0] ||
89 SkShader::kClamp_TileMode != fTileModes[1];
92 FilterMode filterMode() const { return fFilterMode; }
94 bool operator== (const GrTextureParams& other) const {
95 return fTileModes[0] == other.fTileModes[0] &&
96 fTileModes[1] == other.fTileModes[1] &&
97 fFilterMode == other.fFilterMode;
100 bool operator!= (const GrTextureParams& other) const { return !(*this == other); }
104 SkShader::TileMode fTileModes[2];
105 FilterMode fFilterMode;
108 /** A class representing the swizzle access pattern for a texture. Note that if the texture is
109 * an alpha-only texture then the alpha channel is substituted for other components. Any mangling
110 * to handle the r,g,b->a conversions for alpha textures is automatically included in the stage
111 * key. However, if a GrProcessor uses different swizzles based on its input then it must
112 * consider that variation in its key-generation.
114 class GrTextureAccess : public SkNoncopyable {
116 SK_DECLARE_INST_COUNT_ROOT(GrTextureAccess);
119 * A default GrTextureAccess must have reset() called on it in a GrProcessor subclass's
120 * constructor if it will be accessible via GrProcessor::textureAccess().
125 * Uses the default swizzle, "rgba".
127 GrTextureAccess(GrTexture*, const GrTextureParams&);
128 explicit GrTextureAccess(GrTexture*,
129 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
130 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
133 * swizzle must be a string between one and four (inclusive) characters containing only 'r',
134 * 'g', 'b', and/or 'a'.
136 GrTextureAccess(GrTexture*, const char* swizzle, const GrTextureParams&);
137 GrTextureAccess(GrTexture*,
139 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
140 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
142 void reset(GrTexture*, const GrTextureParams&);
143 void reset(GrTexture*,
144 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
145 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
146 void reset(GrTexture*, const char* swizzle, const GrTextureParams&);
147 void reset(GrTexture*,
149 GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
150 SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
152 bool operator== (const GrTextureAccess& other) const {
154 // below assumes all chars in fSwizzle are initialized even if string is < 4 chars long.
155 SkASSERT(memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1) ==
156 strcmp(fSwizzle, other.fSwizzle));
158 return fParams == other.fParams &&
159 (this->getTexture() == other.getTexture()) &&
160 (0 == memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1));
163 bool operator!= (const GrTextureAccess& other) const { return !(*this == other); }
165 GrTexture* getTexture() const { return fTexture.get(); }
168 * For internal use by GrProcessor.
170 const GrGpuResourceRef* getProgramTexture() const { return &fTexture; }
173 * Returns a string representing the swizzle. The string is is null-terminated.
175 const char* getSwizzle() const { return fSwizzle; }
177 /** Returns a mask indicating which components are referenced in the swizzle. The return
178 is a bitfield of GrColorComponentFlags. */
179 uint32_t swizzleMask() const { return fSwizzleMask; }
181 const GrTextureParams& getParams() const { return fParams; }
184 void setSwizzle(const char*);
186 typedef GrTGpuResourceRef<GrTexture> ProgramTexture;
188 ProgramTexture fTexture;
189 GrTextureParams fParams;
190 uint32_t fSwizzleMask;
193 typedef SkNoncopyable INHERITED;