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■ 6.3 CMDPMOD (drawing mode word)

CMDPMOD is a word that controls clipping enable / disable, mesh processing, transparency code specification, color mode specification, color calculation, and shade processing. It is in 2 bytes (16 bits) from the start address + 04H of the command table. The bit configuration is as follows. Set 0 to unused bits.

MSB on bit: MSB on (MON), bit 15
VDP2 has a function to perform shadow and window processing by looking at the MSB of sprite data. Specify this bit to use the function. For details, refer to the VDP2 manual.

High speed shrink: high speed shrink (HSS), bit 12
Select whether to give priority to speed or accuracy when drawing a rectangular sprite or deformed sprite.

Pre-clipping disabled: Preclipping disable (Pclp), bit 11
Specify whether or not to disable the coordinate calculation process that determines whether clipping is necessary.

User clipping enable bit: user clipping enable bit (Clip), bit 10
Specifies whether or not to draw the part according to the user clipping coordinates that have already been set for the part drawing command.

Clipping mode bit: Clipping mode bit (Cmod), bit 9
When user clipping is enabled (Clip = 1), select whether to draw the inside or outside of the user clipping coordinates.

Mesh enable bit: mesh enable bit (Mesh), bit 8
Specify whether to perform mesh processing when drawing a part.

End code disable bit: end-code disable (ECD), bit 7
Specify whether to disable the end code of the character pattern.

Transparent pixel disable bit: See-through pixel disable (SPD), bit 6
Specify whether to disable the transparent pixel of the character pattern.

Color mode bit: color mode bit, bits 5 to 3
Specify the number of colors for drawing the sprite and the expression method.

Color calculation bit: color calculation bit, bits 2 to 0
Specify Gouraud shading, shadow, semi-brightness, and translucent color operations.

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