1 /* 2 * Copyright 2013 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 GrGLExtensions_DEFINED 9 #define GrGLExtensions_DEFINED 10 11 #include "GrGLFunctions.h" 12 #include "SkString.h" 13 #include "SkTArray.h" 14 15 struct GrGLInterface; 16 17 /** 18 * This helper queries the current GL context for its extensions, remembers them, and can be 19 * queried. It supports both glGetString- and glGetStringi-style extension string APIs and will 20 * use the latter if it is available. 21 */ 22 class SK_API GrGLExtensions { 23 public: 24 GrGLExtensions() : fInitialized(false), fStrings(SkNEW(SkTArray<SkString>)) {} 25 26 GrGLExtensions(const GrGLExtensions&); 27 28 GrGLExtensions& operator=(const GrGLExtensions&); 29 30 void swap(GrGLExtensions* that) { 31 fStrings.swap(&that->fStrings); 32 SkTSwap(fInitialized, that->fInitialized); 33 } 34 35 /** 36 * We sometimes need to use this class without having yet created a GrGLInterface. This version 37 * of init expects that getString is always non-NULL while getIntegerv and getStringi are non- 38 * NULL if on desktop GL with version 3.0 or higher. Otherwise it will fail. 39 */ 40 bool init(GrGLStandard standard, 41 GrGLGetStringProc getString, 42 GrGLGetStringiProc getStringi, 43 GrGLGetIntegervProc getIntegerv); 44 45 bool isInitialized() const { return fInitialized; } 46 47 /** 48 * Queries whether an extension is present. This will fail if init() has not been called. 49 */ 50 bool has(const char[]) const; 51 52 /** 53 * Removes an extension if present. Returns true if the extension was present before the call. 54 */ 55 bool remove(const char[]); 56 57 /** 58 * Adds an extension to list 59 */ 60 void add(const char[]); 61 62 void reset() { fStrings->reset(); } 63 64 void print(const char* sep = "\n") const; 65 66 private: 67 bool fInitialized; 68 SkAutoTDelete<SkTArray<SkString> > fStrings; 69 }; 70 71 #endif 72
