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 "../../private/SkTArray.h" 12 #include "GrGLFunctions.h" 13 #include "SkString.h" 14 15 #include <utility> 16 17 struct GrGLInterface; 18 class SkJSONWriter; 19 20 /** 21 * This helper queries the current GL context for its extensions, remembers them, and can be 22 * queried. It supports both glGetString- and glGetStringi-style extension string APIs and will 23 * use the latter if it is available. It also will query for EGL extensions if a eglQueryString 24 * implementation is provided. 25 */ 26 class SK_API GrGLExtensions { 27 public: GrGLExtensions()28 GrGLExtensions() {} 29 30 GrGLExtensions(const GrGLExtensions&); 31 32 GrGLExtensions& operator=(const GrGLExtensions&); 33 swap(GrGLExtensions * that)34 void swap(GrGLExtensions* that) { 35 using std::swap; 36 swap(fStrings, that->fStrings); 37 swap(fInitialized, that->fInitialized); 38 } 39 40 /** 41 * We sometimes need to use this class without having yet created a GrGLInterface. This version 42 * of init expects that getString is always non-NULL while getIntegerv and getStringi are non- 43 * NULL if on desktop GL with version 3.0 or higher. Otherwise it will fail. 44 */ 45 bool init(GrGLStandard standard, 46 GrGLFunction<GrGLGetStringFn> getString, 47 GrGLFunction<GrGLGetStringiFn> getStringi, 48 GrGLFunction<GrGLGetIntegervFn> getIntegerv, 49 GrGLFunction<GrEGLQueryStringFn> queryString = nullptr, 50 GrEGLDisplay eglDisplay = nullptr); 51 isInitialized()52 bool isInitialized() const { return fInitialized; } 53 54 /** 55 * Queries whether an extension is present. This will fail if init() has not been called. 56 */ 57 bool has(const char[]) const; 58 59 /** 60 * Removes an extension if present. Returns true if the extension was present before the call. 61 */ 62 bool remove(const char[]); 63 64 /** 65 * Adds an extension to list 66 */ 67 void add(const char[]); 68 reset()69 void reset() { fStrings.reset(); } 70 71 void dumpJSON(SkJSONWriter*) const; 72 73 private: 74 bool fInitialized = false; 75 SkTArray<SkString> fStrings; 76 }; 77 78 #endif 79