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Questions tagged [eaglcontext]

An EAGLContext object manages the state information, commands, and resources needed to draw using OpenGL ES.

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drawImage() different on iPad and iPhone?

I have a glView which is 51x51px like this. ... glContext = EAGLContext(API: .OpenGLES2) glView = GLKView() glView.context = glContext ciContext = CIContext(EAGLContext: glContext) glView.layer.borderColor =…
Chris
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Find out when OpenGL ES content is actually displayed on iOS

When using a EAGLContext with render buffer storage in a CAEAGLLayer, after calling presentRenderbuffer, 1) Is the appearance of the buffer synchronized with vertical screen refresh? 2) How can I get a timestamp for the start of the vertical scan…
devx
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Should I recreate the EAGL context when handling an handleScreenDidConnectNotification?

I am attempting to handle handleScreenDid(Dis)ConnectNotification's in iOS. The problem I have is that I get an error of GL_INVALID_FRAMEBUFFER_OPERATION from non-specific glFunctions() in my application 2 frames after handling a…
ashleysmithgpu
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UIScrollView with multiple GLPaint's drawing view as subview ; Screen Capture

I have a UIScrollView, with multiple drawable views as subviews. I am using Apple's GLPaint code. My problem is when I capture the UIScrollView's content to form an UIImage, the state of my drawing view is not captured. Below is the code I use for…
user1258958
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GLKViewController (GLKView) glReadPixels return black pixels after iO6

I'm using GLKViewController with a GLKView, on ios5 works fine, after io6 update glReadPixels stopped to work, and return only black pixels. I read something about preserveBackBuffer, but o success yet My setup of GLKView: _context = [[EAGLContext…
GTSouza
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Xcode Screenshot EAGLContext

Possible Duplicate: How to get UIImage from EAGLView? So I was just wondering if anybody knows any way to save what is stored in an EAGLContext as a UIImage. I am currently using: UIGraphicsBeginImageContext(CGSizeMake(768, 1024)); [self.layer…
Matthew Hallatt
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Using the same EAGLContext across different ViewControllers/EAGLViews

I'm having some issues using the same EAGLContext across EAGLViews. I have two View Controllers, each one has one EAGLView. Each View Controller allocates a new EAGLContext, and a subsequent framebuffer/colorbuffer is created for each respective…
Nuno Miguel Fonseca
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EAGLContext to UIImage

In objective-C, I was able to render the EAGLContext to UIImage using glReadPixels to read the pixel data from the framebuffer, creating a CGImage using the pixel data, and then retrieving a UIImage from the context. I am trying a new method in…
CTRLALTDELx64
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One EAGLContext causes another EAGLContext not towork with iOS OpenGL

I have two classes to show different CIImage. They both have the same way to create OpenGL objects like in the following example. _context = [[EAGLContext alloc]initWithAPI:kEAGLRenderingAPIOpenGLES3]; _coreImageContext = [CIContext…
Lawrence Zhang
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How multiple OpenGL views share single GL_RENDERBUFFER in iOS

Let's say I have two views need to present the same OpenGL content in renderBuffer. How do I bind this two view's CAEAGLLayer to the renderBuffer?renderbufferStorage:fromDrawable: just bind the last CAEAGLLayer to GL_RENDEARBUFFER.
ooOlly
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GPUImage work with other OpenGL Context failed

In my projiect , I get a opaque filter framework which based on GPUImage. I wanna create an app can have a video call just like FaceTime,so I use this filter framework provided OpenGL ViewA to render camera image,Using my own openGL viewB to render…
ooOlly
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Using UIImagePickerController in the game

I want to make a game, where the user can touch a picture of a TV and then choose a picture from their photo library. I had success working with UITextFields, adding them to my EAGLView as subviews But I haven't been able to do the same thing with…
José Joel.
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GLKView won't change pixel format

There is an issue of GLKView, I'm stuck here a lot. First, I create EAGLContext context and make it current: EAGLContext* pOpenGLContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES3]; if(!pOpenGLContext) return…
Andrey Mironov
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CGMutuablePath and GLPaint

Referring to this question :OpenGL ES Fill Effect I am trying to do the samething , but I have Custom UIView , which contains different CGMutuablePath and only drawing is enabled in selected UIView. I have used GLPaint, PaintingView class and…
Asema Hassan
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Ios how to draw UIImage in EAGLContext?

i'm doing an "finger drawing app". I'm using Apple's example [here][1]. But i want to add an undo option. In order to do this, i'm saving the EAGLContext content into an image every time the app handles the end of a touch event. The problem comes…
user1078065
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