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Max size for a texture #870
This is GPU specific:
"Proper" discrete desktop GPUs will probably support 8,192 x 8,192 pixels (up to maximum of 16,384 x 16,384).
If you want to be safe, seems 2,048 x 2,048 is minimum supported across wide variety of systems (including integrated Intel GPUs and old discrete GPUs):
For mobile devices, from above stats it seems for iOS maximum is 2,048 x 2,048, for Android it's 4,096 x 4,096 pixels.