michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef GrGLExtensions_DEFINED
michael@0: #define GrGLExtensions_DEFINED
michael@0: 
michael@0: #include "GrGLFunctions.h"
michael@0: #include "SkString.h"
michael@0: #include "SkTArray.h"
michael@0: 
michael@0: struct GrGLInterface;
michael@0: 
michael@0: /**
michael@0:  * This helper queries the current GL context for its extensions, remembers them, and can be
michael@0:  * queried. It supports both glGetString- and glGetStringi-style extension string APIs and will
michael@0:  * use the latter if it is available.
michael@0:  */
michael@0: class SK_API GrGLExtensions {
michael@0: public:
michael@0:     GrGLExtensions() : fInitialized(false), fStrings(SkNEW(SkTArray<SkString>)) {}
michael@0: 
michael@0:     GrGLExtensions(const GrGLExtensions&);
michael@0: 
michael@0:     GrGLExtensions& operator=(const GrGLExtensions&);
michael@0: 
michael@0:     void swap(GrGLExtensions* that) {
michael@0:         fStrings.swap(&that->fStrings);
michael@0:         SkTSwap(fInitialized, that->fInitialized);
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * We sometimes need to use this class without having yet created a GrGLInterface. This version
michael@0:      * of init expects that getString is always non-NULL while getIntegerv and getStringi are non-
michael@0:      * NULL if on desktop GL with version 3.0 or higher. Otherwise it will fail.
michael@0:      */
michael@0:     bool init(GrGLStandard standard,
michael@0:               GrGLGetStringProc getString,
michael@0:               GrGLGetStringiProc getStringi,
michael@0:               GrGLGetIntegervProc getIntegerv);
michael@0: 
michael@0:     bool isInitialized() const { return fInitialized; }
michael@0: 
michael@0:     /**
michael@0:      * Queries whether an extension is present. This will fail if init() has not been called.
michael@0:      */
michael@0:     bool has(const char[]) const;
michael@0: 
michael@0:     /**
michael@0:      * Removes an extension if present. Returns true if the extension was present before the call.
michael@0:      */
michael@0:     bool remove(const char[]);
michael@0: 
michael@0:     /**
michael@0:      * Adds an extension to list
michael@0:      */
michael@0:     void add(const char[]);
michael@0: 
michael@0:     void reset() { fStrings->reset(); }
michael@0: 
michael@0:     void print(const char* sep = "\n") const;
michael@0: 
michael@0: private:
michael@0:     bool                                fInitialized;
michael@0:     SkAutoTDelete<SkTArray<SkString> >  fStrings;
michael@0: };
michael@0: 
michael@0: #endif