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?
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The output you get from the camera in iOS is a
CMSampleBufferRef, with aCVPixelBufferRefinside. (See documentation here). iOS from version 5 hasCVOpenGLESTextureCachein the CoreVideo framework, which allows you to create an OpenGL ES texture using aCVPixelBufferRef, avoiding any copies.Check the RosyWriter sample in Apple's developer website, it's all there.