glfw/lib/init.c

//========================================================================
// GLFW - An OpenGL framework
// Platform:    Any
// API version: 3.0
// WWW:         http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would
//    be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
//    be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
//    distribution.
//
//========================================================================

#define _init_c_
#include "internal.h"

#include <string.h>


//************************************************************************
//****                    GLFW user functions                         ****
//************************************************************************

//========================================================================
// Initialize various GLFW state
//========================================================================

GLFWAPI int glfwInit(void)
{
    if (_glfwInitialized)
        return GL_TRUE;

    memset(&_glfwLibrary, 0, sizeof(_glfwLibrary));

    // Clear window hints
    _glfwClearWindowHints();

    // Platform specific initialization
    if (!_glfwPlatformInit())
        return GL_FALSE;

    // Form now on, GLFW state is valid
    _glfwInitialized = GL_TRUE;

    return GL_TRUE;
}


//========================================================================
// Close window and shut down library
//========================================================================

GLFWAPI void glfwTerminate(void)
{
    if (!_glfwInitialized)
        return;

    // Platform specific termination
    if (!_glfwPlatformTerminate())
        return;

    // GLFW is no longer initialized
    _glfwInitialized = GL_FALSE;
}


//========================================================================
// Get GLFW version
//========================================================================

GLFWAPI void glfwGetVersion(int* major, int* minor, int* rev)
{
    if (major != NULL)
        *major = GLFW_VERSION_MAJOR;

    if (minor != NULL)
        *minor = GLFW_VERSION_MINOR;

    if (rev != NULL)
        *rev = GLFW_VERSION_REVISION;
}