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UtilSrc/glUtil.h

/*

     File: glUtil.h

 Abstract:

 Includes the appropriate OpenGL headers (depending on whether this

 is built for iOS or OSX) and provides some API utility functions

  Version: 1.7

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

 Inc. ("Apple") in consideration of your agreement to the following

 terms, and your use, installation, modification or redistribution of

 this Apple software constitutes acceptance of these terms.  If you do

 not agree with these terms, please do not use, install, modify or

 redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and

 subject to these terms, Apple grants you a personal, non-exclusive

 license, under Apple's copyrights in this original Apple software (the

 "Apple Software"), to use, reproduce, modify and redistribute the Apple

 Software, with or without modifications, in source and/or binary forms;

 provided that if you redistribute the Apple Software in its entirety and

 without modifications, you must retain this notice and the following

 text and disclaimers in all such redistributions of the Apple Software.

 Neither the name, trademarks, service marks or logos of Apple Inc. may

 be used to endorse or promote products derived from the Apple Software

 without specific prior written permission from Apple.  Except as

 expressly stated in this notice, no other rights or licenses, express or

 implied, are granted by Apple herein, including but not limited to any

 patent rights that may be infringed by your derivative works or by other

 works in which the Apple Software may be incorporated.

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

 POSSIBILITY OF SUCH DAMAGE.

 Copyright (C) 2013 Apple Inc. All Rights Reserved.

*/

#ifndef __GL_UTIL_H__

#define __GL_UTIL_H__

#if ESSENTIAL_GL_PRACTICES_IOS

#import <OpenGLES/ES2/gl.h>

#import <OpenGLES/ES2/glext.h>

#else

#import <OpenGL/OpenGL.h>

// OpenGL 3.2 is only supported on MacOS X Lion and later

// CGL_VERSION_1_3 is defined as 1 on MacOS X Lion and later

#if CGL_VERSION_1_3

// Set to 0 to run on the Legacy OpenGL Profile

#define ESSENTIAL_GL_PRACTICES_SUPPORT_GL3 1

#else

#define ESSENTIAL_GL_PRACTICES_SUPPORT_GL3 0

#endif //!CGL_VERSION_1_3

#if ESSENTIAL_GL_PRACTICES_SUPPORT_GL3

#import <OpenGL/gl3.h>

#else

#import <OpenGL/gl.h>

#endif //!ESSENTIAL_GL_PRACTICES_SUPPORT_GL3

#endif // !ESSENTIAL_GL_PRACTICES_IOS

//The name of the VertexArrayObject are slightly different in

// OpenGLES, OpenGL Core Profile, and OpenGL Legacy

// The arguments are exactly the same across these APIs however

#if ESSENTIAL_GL_PRACTICES_IOS

#define glBindVertexArray glBindVertexArrayOES

#define glGenVertexArrays glGenVertexArraysOES

#define glDeleteVertexArrays glDeleteVertexArraysOES

#else

#if ESSENTIAL_GL_PRACTICES_SUPPORT_GL3

#define glBindVertexArray glBindVertexArray

#define glGenVertexArrays glGenVertexArrays

#define glGenerateMipmap glGenerateMipmap

#define glDeleteVertexArrays glDeleteVertexArrays

#else

#define glBindVertexArray glBindVertexArrayAPPLE

#define glGenVertexArrays glGenVertexArraysAPPLE

#define glGenerateMipmap glGenerateMipmapEXT

#define glDeleteVertexArrays glDeleteVertexArraysAPPLE

#endif //!ESSENTIAL_GL_PRACTICES_SUPPORT_GL3

#endif //!ESSENTIAL_GL_PRACTICES_IOS

static inline const char * GetGLErrorString(GLenum error)

    const char *str;

    switch( error )

        case GL_NO_ERROR:

            str = "GL_NO_ERROR";

            break;

        case GL_INVALID_ENUM:

            str = "GL_INVALID_ENUM";

            break;

        case GL_INVALID_VALUE:

            str = "GL_INVALID_VALUE";

            break;

        case GL_INVALID_OPERATION:

            str = "GL_INVALID_OPERATION";

            break;

#if defined __gl_h_ || defined __gl3_h_

        case GL_OUT_OF_MEMORY:

            str = "GL_OUT_OF_MEMORY";

            break;

        case GL_INVALID_FRAMEBUFFER_OPERATION:

            str = "GL_INVALID_FRAMEBUFFER_OPERATION";

            break;

#endif

#if defined __gl_h_

        case GL_STACK_OVERFLOW:

            str = "GL_STACK_OVERFLOW";

            break;

        case GL_STACK_UNDERFLOW:

            str = "GL_STACK_UNDERFLOW";

            break;

        case GL_TABLE_TOO_LARGE:

            str = "GL_TABLE_TOO_LARGE";

            break;

#endif

        default:

            str = "(ERROR: Unknown Error Enum)";

            break;

    return str;

#endif // __GL_UTIL_H__

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