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■ Functions of VDP1
- VDP1 functions include drawing parts (characters and lines), specifying colors, color operations for Gouraud shading, specifying clipping and relative coordinates, and controlling the frame buffer display. The part, color, and coordinates are controlled by the command table in VRAM, and the display of the frame buffer is controlled by the system register.
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● Parts
- The figures that can be drawn as parts are as follows.
- Standard sprite
- Rectangle sprite (with zoom)
- Deformed sprite (including rotation)
- Polygon (Rectangle)
- Polyline (Rectangle with 4 lines)
- Line
∙ Sprites are collectively called texture parts, and other polygons, polylines, and lines are called non-texture parts.
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● Color
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- 16, 64, 128, 256, 32768 colors are possible per texture part
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Special function
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- When RGB code is used, semi-luminance, semi-transparency, Gouraud shading, and shadow (shadowing) color operations are possible
- Mesh (tiling)
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● Coordinate control
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- Can set two clippings, system and user
- You can specify relative coordinates for drawing
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● Frame buffer display control
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- Enlargement / reduction and rotation of the entire frame buffer screen
- Specify TV display mode
- Frame buffer switching mode, switching trigger and drawing trigger specification
- Double dense interlace specification
- Fill area specification and fill data specification during erase write
- Transfer end status to frame buffer as help information during program development
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