Texture Wrapping - Fujitsu MB86R02 Jade-D Hardware Manual

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MB86R02 'Jade-D' Hardware Manual V1.64

Texture Wrapping

If a negative or larger than the specified texture pattern size is specified as the texture coordinates (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:

This just simply masks the upper bits of the applied (S, T) coordinates. When the texture pattern

size is 64 × 64 pixels, the lower 6 bits of the integer part of (S, T) coordinates are used for S and T

coordinates.

When the applied (S, T) coordinates is either negative or larger than the specified texture pattern

size, cramp the (S, T) coordinate as follows instead of texture:

S > Texture X size − 1

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.

S = Texture X size − 1