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

■Mesh enabled

Mesh enable bit: mesh enable bit(Mesh), bit 8
Specify whether to perform mesh processing when using part drawing commands. When set to 0, drawing is performed without mesh processing. When set to 1, mesh processing is performed and drawn.

 Mesh
 mesh enabled
 0
 Draw without mesh processing
 1
 Draw with mesh processing

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

Figure 6.8 Mesh processing

Figure 6.9 Meshing of lines and polylines


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