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 "GrGLInterface.h"
12#include "SkString.h"
13#include "SkTArray.h"
14
15/**
16 * This helper queries the current GL context for its extensions, remembers them, and can be
17 * queried. It supports both glGetString- and glGetStringi-style extension string APIs and will
18 * use the latter if it is available.
19 */
20class GrGLExtensions {
21public:
22    bool init(GrGLBinding binding, const GrGLInterface* iface) {
23        GrAssert(binding & iface->fBindingsExported);
24        return this->init(binding, iface->fGetString, iface->fGetStringi, iface->fGetIntegerv);
25    }
26    /**
27     * We sometimes need to use this class without having yet created a GrGLInterface. This version
28     * of init expects that getString is always non-NULL while getIntegerv and getStringi are non-
29     * NULL if on desktop GL with version 3.0 or higher. Otherwise it will fail.
30     */
31    bool init(GrGLBinding binding,
32              GrGLGetStringProc getString,
33              GrGLGetStringiProc getStringi,
34              GrGLGetIntegervProc getIntegerv);
35
36    /**
37     * Queries whether an extension is present. This will fail if init() has not been called.
38     */
39    bool has(const char*) const;
40
41    void reset() { fStrings.reset(); }
42
43    void print(const char* sep = "\n") const;
44
45private:
46    SkTArray<SkString> fStrings;
47};
48
49#endif
50