Sets the UV wrap mode of the image when the U coordinate goes outside the range 0-1. The default is mode 0 which clamps the pixel value to the last valid pixel, mode 1 repeats the texture starting from the opposite side.
To use UV values outside 0-1 successfully on all platforms the image in question must be a power of 2 in width and height, and not be part of an atlas texture. This applies to both clamp and repeat.
SetImageWrapU( iImageIndex, mode )
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