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- Parts
- The thing drawn with the drawing command is called Parts . Parts are divided into texture parts and non-texture parts . The texture parts are sprites. Non-textured parts include polygons, polylines, and lines.
Sprite is a so-called character. Character defines character color code in VRAM as Character pattern table . Polygon is a filled rectangle, Polyline is an unfilled rectangle, and Line is a straight line connecting two points.
∙ VDP1 processes drawing commands on VRAM and draws parts to the frame buffer. Drawing is done in pixel (pixel) units. Data on the frame buffer expresses color at 16 or 8bit / pixel.
- Color
- There are two color representation methods: RGB code and color bank based on palette code and color bank.
The RGB code system expresses colors by specifying the brightness of red (R), green (G), and blue (B) in 5 bits.
In the color bank method, select the color palette of VDP2 in the color bank, and select the color from the color palette with the palette code.
∙ Sprites can also be specified in color using the Color Lookup Table method. Define 16 colors in the color lookup table, and choose a color from them. The color code can be specified by either RGB code or color bank code.
- Color calculation
- Color calculation is a special function of VDP1. Gouraud shading is a color operation. The brightness of the RGB code of the part is changed with the four RGB codes defined in the Gouraud shading table .
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