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Shadow halves the pixel brightness of the frame buffer. To make the brightness 1/4, set the same command table in VRAM twice. Set it 3 times if you want 1/8.
Note that with shadow, the pixel data read from the pixel data writing coordinates of the original picture is calculated, so the drawing speed will drop. It takes 6 times longer than when not performing color calculation.

Half brightness (color operation mode = 2)

The half-brightness is half of the brightness of the pixel data of the drawn part, R, G, B respectively.
* Pixel data already written in the frame buffer is not affected.

Translucent (color operation mode = 3)

Processing varies depending on the MSB of the frame buffer. If the MSB of the frame buffer is 0, it will be replaced.
∙ Translucent when MSB of frame buffer is 1.
In semi-transparent, 1/2 (average) of the sum of the original picture and background data is written to the frame buffer.
In case of translucent color calculation, color calculation is performed on the pixel data of the original picture and the pixel data read from the writing coordinates. Note that this will slow down the drawing speed. It takes 6 times longer than when not performing color calculation.

Gouraud shading (color calculation mode = 4)

Gouraud shading is performed using the RGB code set in the Gouraud shading table.
* Pixel data already written in the frame buffer is not affected.
Specified as Gouraud shading table address by CMDGRDA (command table start address + 1CH).

Gouraud shading half brightness (color calculation mode = 6)

Gouraud shading half luminance is a combination of Gouraud shading and half luminance. After the part is processed with Gouraud shading, it is processed with half brightness.

Gouraud shading translucent (color calculation mode = 7)

Processing varies depending on the MSB of the frame buffer. If the MSB of the frame buffer is 0, Gouraud shading is used.
* When MSB of frame buffer is 1, Gouraud shading becomes translucent.

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