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