MB86290A Datasheet, PDF (67/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

6.4.3 Texture Lapping
If a negative or larger than applicable value is specified as the texture
coordinate (S, T), according to the setting, one of these options (repeat, cramp
or border) is selected for the ‘out-of-range’ texture mapping. The mapping
image for each case is shown below:
Repeat
Repeat
Cramp
Border
This just masks the upper bits of the applied (S, T) coordinate and enables
the lower bits of the coordinate within the specified texture pattern size.
When the texture pattern size is 64 × 64pixels, it masks the upper bits of the
integer part of (S, T) the coordinate and enables the lower 6 bits.
Cramp
When the applied (S, T) coordinate is either negative or larger than the
specified texture pattern size, cramp the (S, T) coordinate as follows:
S<0
S=0
S > Texture X size – 1 S = Texture X size – 1
Border
When the applied (S, T) coordinate is either negative or larger than the
specified texture pattern size, the outside of the specified texture pattern is
rendered in the ‘border’ color.
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