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+/*
+
+===== IMPORTANT =====
+
+This is sample code demonstrating API, technology or techniques in development.
+Although this sample code has been reviewed for technical accuracy, it is not
+final. Apple is supplying this information to help you plan for the adoption of
+the technologies and programming interfaces described herein. This information
+is subject to change, and software implemented based on this sample code should
+be tested with final operating system software and final documentation. Newer
+versions of this sample code may be provided with future seeds of the API or
+technology. For information about updates to this and other developer
+documentation, view the New & Updated sidebars in subsequent documentation
+seeds.
+
+=====================
+
+File: OpenGL_Internal.h
+Abstract: This file is included for support purposes and isn't necessary for
+understanding this sample.
+
+Version: 1.0
+
+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) 2008 Apple Inc. All Rights Reserved.
+
+*/
+
+/* Generic error reporting */
+#define REPORT_ERROR(__FORMAT__, ...) printf("%s: %s\n", __FUNCTION__, [[NSString stringWithFormat:__FORMAT__, __VA_ARGS__] UTF8String])
+
+/* EAGL and GL functions calling wrappers that log on error */
+#define CALL_EAGL_FUNCTION(__FUNC__, ...) ({ EAGLError __error = __FUNC__( __VA_ARGS__ ); if(__error != kEAGLErrorSuccess) printf("%s() called from %s returned error %i\n", #__FUNC__, __FUNCTION__, __error); (__error ? NO : YES); })
+//#define CHECK_GL_ERROR() ({ GLenum __error = glGetError(); if(__error) printf("OpenGL error 0x%04X in %s\n", __error, __FUNCTION__); (__error ? NO : YES); })
+#define CHECK_GL_ERROR() ({ GLenum __error = glGetError(); if(__error) printf("OpenGL error 0x%04X in %s\n", __error, __FUNCTION__); })
+
+/* Optional delegate methods support */
+#ifndef __DELEGATE_IVAR__
+#define __DELEGATE_IVAR__ _delegate
+#endif
+#ifndef __DELEGATE_METHODS_IVAR__
+#define __DELEGATE_METHODS_IVAR__ _delegateMethods
+#endif
+#define TEST_DELEGATE_METHOD_BIT(__BIT__) (self->__DELEGATE_METHODS_IVAR__ & (1 << __BIT__))
+#define SET_DELEGATE_METHOD_BIT(__BIT__, __NAME__) { if([self->__DELEGATE_IVAR__ respondsToSelector:@selector(__NAME__)]) self->__DELEGATE_METHODS_IVAR__ |= (1 << __BIT__); else self->__DELEGATE_METHODS_IVAR__ &= ~(1 << __BIT__); }