Dr. Dobb's Journal - August 2008 - (Page 27) .MM to allow C++ classes to be used in Objective C code. The XCode template creates a Cocoa view class called EAGView, and stubs in all the necessary OpenGL hooks. This is the class in which I bridge to my own C++ implementation. In EAGLView.h, add the include for MyGLView.h and declare an instance of the class (Listing Two). In Listing Two, the OpenGL ES include files leave EAGL.h out of any C++-only source files (as well as UIKit.h, which is Cocoa GUI code), but you will need the gl.h and potentially the glext.h headers in any source module that calls OpenGL ES functions. In EAGLView.mm, you find the initWithCoder method. Here, after the context creation, you place the code to tell your class to do its initialization, and set up the projection. Because you can’t change the window size on the iPhone, you don’t need to watch for changes and call ResizeGL again: myGLView.InitializeGL(); myGLView.ResizeGL(backingWidth, backingHeight); animationInterval = 1.0 / 60.0; Listing Two #import #import #import #import #include "MyGLView.h" @interface EAGLView : UIView { @private MyGLView myGLView; // Instance of our C++ class } @property NSTimeInterval animationInterval; - (void)startAnimation; - (void)stopAnimation; - (void)drawView; @end You can also set the desired target frame rate. The buffer swap is always synced and there is never any tearing on the iPhone. Sixty fps will always be the top frame rate you can attain. In drawView, I call the PaintGL method of the C++ class: - (void)drawView { [EAGLContext setCurrentContext:context]; glBindFramebufferOES (GL_FRAMEBUFFER_OES, viewFramebuffer); // New line myGLView.ResizeGL(backingWidth, backingHeight); // New line myGLView.PaintGL(); glBindRenderbufferOES (GL_RENDERBUFFER_OES, viewRenderbuffer); [context presentRenderbuffer: GL_RENDERBUFFER_OES]; } Finally, when the view is destroyed (the application is terminated), dealloc is called and I call ShutdownGL to do any cleanup before the OpenGL context is destroyed: August 2008 l www.ddj.com l Dr. Dobb’s Journal 27 http://www.programmingresearch.com http://www.programmingresearch.com http://www.ddj.com
Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - August 2008 Dr. Dobb's Journal - August 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries Developer’s Notebook A Conversation with Christos Papadimitriou OpenGL and Mobile Devices: Round 2 Ellipse Specification Using Vectors Embed Custom GUIs in WPF Building RIAs on J2EE Foundations Disentangling Concepts in Object-Oriented Systems The Agile Edge Effective Concurrency Swaine’s Flames Dr. Dobb's Journal - August 2008 Dr. Dobb's Journal - August 2008 - Dr. Dobb's Journal - August 2008 (Page Cover1) Dr. Dobb's Journal - August 2008 - Dr. Dobb's Journal - August 2008 (Page Cover2) Dr. Dobb's Journal - August 2008 - Dr. Dobb's Journal - August 2008 (Page 1) Dr. Dobb's Journal - August 2008 - Dr. Dobb's Journal - August 2008 (Page 2) Dr. Dobb's Journal - August 2008 - Dr. Dobb's Journal - August 2008 (Page 3) Dr. Dobb's Journal - August 2008 - Contents (Page 4) Dr. Dobb's Journal - August 2008 - Contents (Page 5) Dr. Dobb's Journal - August 2008 - Friday Night Fish Fry (Page 6) Dr. Dobb's Journal - August 2008 - Friday Night Fish Fry (Page 7) Dr. Dobb's Journal - August 2008 - Friday Night Fish Fry (Page 8) Dr. Dobb's Journal - August 2008 - Friday Night Fish Fry (Page 9) Dr. Dobb's Journal - August 2008 - Alia Vox (Page 10) Dr. Dobb's Journal - August 2008 - Alia Vox (Page 11) Dr. Dobb's Journal - August 2008 - Developer Diaries (Page 12) Dr. Dobb's Journal - August 2008 - Developer Diaries (Page 13) Dr. Dobb's Journal - August 2008 - Developer’s Notebook (Page 14) Dr. Dobb's Journal - August 2008 - Developer’s Notebook (Page 15) Dr. Dobb's Journal - August 2008 - A Conversation with Christos Papadimitriou (Page 16) Dr. Dobb's Journal - August 2008 - A Conversation with Christos Papadimitriou (Page 17) Dr. Dobb's Journal - August 2008 - A Conversation with Christos Papadimitriou (Page 18) Dr. Dobb's Journal - August 2008 - A Conversation with Christos Papadimitriou (Page 19) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 20) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 21) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 22) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 23) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 24) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 25) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 26) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 27) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 28) Dr. Dobb's Journal - August 2008 - OpenGL and Mobile Devices: Round 2 (Page 29) Dr. Dobb's Journal - August 2008 - Ellipse Specification Using Vectors (Page 30) Dr. Dobb's Journal - August 2008 - Ellipse Specification Using Vectors (Page 31) Dr. Dobb's Journal - August 2008 - Ellipse Specification Using Vectors (Page 32) Dr. Dobb's Journal - August 2008 - Ellipse Specification Using Vectors (Page 33) Dr. Dobb's Journal - August 2008 - Ellipse Specification Using Vectors (Page 34) Dr. Dobb's Journal - August 2008 - Ellipse Specification Using Vectors (Page 35) Dr. Dobb's Journal - August 2008 - Embed Custom GUIs in WPF (Page 36) Dr. Dobb's Journal - August 2008 - Embed Custom GUIs in WPF (Page 37) Dr. Dobb's Journal - August 2008 - Embed Custom GUIs in WPF (Page 38) Dr. Dobb's Journal - August 2008 - Embed Custom GUIs in WPF (Page 39) Dr. Dobb's Journal - August 2008 - Building RIAs on J2EE Foundations (Page 40) Dr. Dobb's Journal - August 2008 - Building RIAs on J2EE Foundations (Page 41) Dr. Dobb's Journal - August 2008 - Building RIAs on J2EE Foundations (Page 42) Dr. Dobb's Journal - August 2008 - Building RIAs on J2EE Foundations (Page 43) Dr. Dobb's Journal - August 2008 - Building RIAs on J2EE Foundations (Page 44) Dr. Dobb's Journal - August 2008 - Building RIAs on J2EE Foundations (Page 45) Dr. Dobb's Journal - August 2008 - Disentangling Concepts in Object-Oriented Systems (Page 46) Dr. Dobb's Journal - August 2008 - Disentangling Concepts in Object-Oriented Systems (Page 47) Dr. Dobb's Journal - August 2008 - Disentangling Concepts in Object-Oriented Systems (Page 48) Dr. Dobb's Journal - August 2008 - Disentangling Concepts in Object-Oriented Systems (Page 49) Dr. Dobb's Journal - August 2008 - The Agile Edge (Page 50) Dr. Dobb's Journal - August 2008 - The Agile Edge (Page 51) Dr. Dobb's Journal - August 2008 - The Agile Edge (Page 52) Dr. Dobb's Journal - August 2008 - Effective Concurrency (Page 53) Dr. Dobb's Journal - August 2008 - Effective Concurrency (Page 54) Dr. Dobb's Journal - August 2008 - Effective Concurrency (Page 55) Dr. Dobb's Journal - August 2008 - Swaine’s Flames (Page 56) Dr. Dobb's Journal - August 2008 - Swaine’s Flames (Page Cover3) Dr. Dobb's Journal - August 2008 - Swaine’s Flames (Page Cover4)
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