gfx/gl/GLLibraryLoader.h
author Daisuke Akatsuka <dakatsuka@mozilla.com>
Tue, 14 Aug 2018 10:35:43 +0900
changeset 432046 86e6704908fde59a926376f6e42161d749e80765
parent 416841 54978536db3ea3892035a52a32ee691de8f7e708
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1477600 - Part 2: Implement remove/reload button. r=jdescottes Differential Revision: https://phabricator.services.mozilla.com/D3272

/* 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_ */