If TEXTURE_WRAP_S or TEXTURE_WRAP_T is set to
REPEAT,
then the GL ignores the integer part of s or t
coordinates, respectively,
using only the fractional part.
(For a number r,
the fractional part is 
,
regardless of the sign of r;
recall that the floor function truncates towards 
.)
CLAMP causes s or t coordinates to be clamped to the range
.
The initial state is for both s and t behavior to be that given by
REPEAT.