Camera direct to OpenGL texture on iOS
ios, ios-camera, ipad, iphone, opengl-es-2.0
Solution
The output you get from the camera in iOS is a `CMSampleBufferRef`, with a `CVPixelBufferRef` inside. (See documentation here). iOS from version 5 has `CVOpenGLESTextureCache` in the CoreVideo framework, which allows you to create an OpenGL ES texture using a `CVPixelBufferRef`, avoiding any copies.
Check the RosyWriter sample in Apple's developer website, it's all there.
Problem
On Android, it is possible to make the camera write its output directly to an OpenGL texture (of type GL_TEXTURE_EXTERNAL_OES), avoiding buffers on the CPU altogether. Is such a thing possible on iOS?