MB86290A Datasheet, PDF (69/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

6.4.5 Perspective Correction
This function adjusts the depth distortion of the 3D projection in the texture
mapping process. For this adjustment, the ‘Q’ element of the texture
coordinate (Q = 1/W) is defined from the 3D coordinate of the correlated
vertex. This Q value is used after normalizing in the range between 0.0 and
1.0.
6.4.6 Texture Blending
MB86290A supports the following three texture blending modes:
Decal
This mode displays the mapped texcel color regardless the native polygon
color.
Mo dul at e
This mode multiplies the native polygon color (CP) and sampled texcel color
(CR) and display the result (CO).
St e nc i l
C0 = CR x CP
This mode uses the MSB to select the display color from the sampled texcel
color.
MSB = 1: Texcel color
MSB = 0: Polygon color
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