HARDWARE ManualVDP1 User's Manual
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VDP1 User's Manual / Chapter 6 Command Table

■ Mesh effective

Mesh enable bit: mesh enable bit (Mesh), bit 8
Specifies whether to perform mesh processing when drawing commands for parts. When it is 0, it is drawn without mesh processing. When it is 1, it is meshed and drawn.

 Mesh
 Mesh enabled
 0
 Draw without mesh processing
 1
 Mesh and draw

If mesh processing is specified (Mesh = 1), the parts will be drawn in a grid pattern every other pixel. Only pixels with an even number (XLSB XOR YLSB = 0) of "X coordinate value + Y coordinate value" are drawn, and odd-numbered bixels skip drawing and are not written.
If the starting point of the 45 degree line is odd coordinates, nothing is drawn. Even if the polyline is 45 degrees and the vertices are odd coordinates, it may not be drawn.

Figure 6.8 Mesh processing

Figure 6.9 Line and Polyline Meshing


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HARDWARE ManualVDP1 User's Manual
Copyright SEGA ENTERPRISES, LTD., 1997