Alex

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Yep, this is most likely the issue. OpenGL ES 3.0 hardware support started with iPhone 5s https://developer.apple.com/library/content/documentation/DeviceInformation/Reference/iOSDeviceCompatibility/HardwareGPUInformation/HardwareGPUInformation.html#//apple_ref/doc/uid/TP40013599-CH106-SW1 Is it possible to support ES 2.0 as a fallback, or is shadertoy...