gecko-dev/gfx/gl/GLLibraryLoader.h

/* 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_ */