eaglview

I have an app running on iPad which is using lots of textures, rendering into one EAGLView. Now I need a second EAGLView, sharing textures with the first. I can get both views rendering fine, in parallel, on screen, by fixing some design mistakes in Apple's code (e.g. the default ViewController needs some tweaks to support multiple child EAGLView objects). But I can't get the textures to be shared. I cannot duplicate the textures (that would double memory usage - and we're using most of the mem already). I can't find any documentation from Apple on how to share textures between multiple

The Screen-to-world problem on the iPhon e I have a 3D model (CUBE) rendered in an EAGLView and I want to be able to detect when I am touching the center of a given face (From any orientation angle) of the cube. Sounds pretty easy but it is not... The problem: How do I accurately relate screen-coordinates (touch point) to world-coordinates (a location in OpenGL 3D space)? Sure, converting a given point into a 'percentage' of the screen/world-axis might seem the logical fix, but problems would arise when I need to zoom or rotate the 3D space. Note: rotating & zooming in and out of the 3D space

I have an EAGLView (taken from Apple's examples) which I can successfully convert to a UIImage using this code: - (UIImage *)glToUIImage:(CGSize)size { NSInteger backingWidth = size.width; NSInteger backingHeight = size.height; NSInteger myDataLength = backingWidth * backingHeight * 4; // allocate array and read pixels into it. GLuint *buffer = (GLuint *) malloc(myDataLength); glReadPixels(0, 0, backingWidth, backingHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer); // gl renders “upside down” so swap top to bottom into new array. for(int y = 0; y < backingHeight / 2; y++) { for(int x = 0; x <

I'm looking for way to grab the content of my opengl (as UIImage) and then save it into a file. I'm now giving glReadPixels a try though I'm not sure I'm doing the right thing as of what kind of malloc I should be doing. I gather that on OSX it's GL_BGRA but on the iPhone that doesn't work... All OpenGL|ES complient GL-implementations have to support GL_RGBA as a parameter to glReadPixels. If your OpenGL|Es supports the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES extension you can also query the native format. glReadPixels will understand this format as a parameter to glReadPixels and allows you

Upgrading to the iOS SDK 4.2 I'm experiencing several misbehaviors in my application (another one is asked here ). The one I'm gonna ask your help for concerns an OpenGL view (an EAGLView subclass) that renders no more the 3d model I'm putting in. The view is allocated and it appears to recognize the gestures but its content is not visible (I've checked that it's about the view and not the misplacing of the model by coloring the background: it does not color it through glClearColor() ). When I double tap it it shall resize (it goes fullscreen, before this it is a little UIVIew) calling this

have been struggling with this issue for quite some time now and couldn't find an answer so far. Basically, what I want to do, is capturing the content of my EAGLview and then use it to merge it with other images. Anyway, the mainproblem is, that everything transparent in my EAGLview renders opaque when saving it to the photoalbum or putting it into a UIImageView. Let me share some code with you, I found somewhere else: - (CGImageRef) glToUIImage { unsigned char buffer[320*480*4]; glReadPixels(0,0,320,480,GL_RGBA,GL_UNSIGNED_BYTE,&buffer); CGDataProviderRef ref = CGDataProviderCreateWithData