/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef GLLIBRARYLOADER_H_

#define GLLIBRARYLOADER_H_

#include <stdio.h>

#include "GLDefs.h"

#include "nscore.h"

#include "mozilla/SharedLibrary.h"

namespace mozilla {

namespace gl {

class GLLibraryLoader

{

public:

    bool OpenLibrary(const char* library);

    typedef PRFuncPtr (GLAPIENTRY * PlatformLookupFunction) (const char*);

    enum {

        MAX_SYMBOL_NAMES = 6,

        MAX_SYMBOL_LENGTH = 128

    };

    typedef struct {

        PRFuncPtr* symPointer;

        const char* symNames[MAX_SYMBOL_NAMES];

    } SymLoadStruct;

    bool LoadSymbols(const SymLoadStruct* firstStruct,

                     bool tryplatform = false,

                     const char* prefix = nullptr,

                     bool warnOnFailure = true);

    static void ClearSymbols(const SymLoadStruct* firstStruct);

    PRFuncPtr LookupSymbol(const char* symname);

    /*

     * Static version of the functions in this class

     */

    static PRFuncPtr LookupSymbol(PRLibrary* lib,

                                  const char* symname,

                                  PlatformLookupFunction lookupFunction = nullptr);

    static bool LoadSymbols(PRLibrary* lib,

                            const SymLoadStruct* firstStruct,

                            PlatformLookupFunction lookupFunction = nullptr,

                            const char* prefix = nullptr,

                            bool warnOnFailure = true);

protected:

    GLLibraryLoader() {

        mLibrary = nullptr;

        mLookupFunc = nullptr;

    }

    PRLibrary* mLibrary;

    PlatformLookupFunction mLookupFunc;

};

} /* namespace gl */

} /* namespace mozilla */

#endif /* GLLIBRARYLOADER_H_ */