In one of my previous post, it was discovered Depth Texture is not currently supported for mobile platforms (iOS/Android). It seems many image effects (Depth of Field, Edge Detect Effect Normals, Global Fog, Color Correction Curves, Crease, Sun Shafts, Tilt Shift) depend on the Depth Texture support, which is currently disabled. Which means its support for mobile platform is critical. Depth of Field Edge Detect Normal Global Fog Crease Sun Shafts Tilt Shift dEngine iOS http://fabiensanglard.net/dEngine/index.php http://fabiensanglard.net/dEngineSourceCodeRelease/ Maratis 3D iOS It should be noted that Apple supports GL_OES_depth_texture since iOS 4.1 - which has allow quite a few indie developers to take advantage of and made real-time shadows on iOS successfully. So Depth Texture support is critical for a whole hosts of image effects and dynamic shadow system on mobile platform.