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MB86R02 'Jade-D' Hardware Manual V1.64
18.10.6
Drawing Attributes
18.10.6.1
Line drawing attributes
In drawing lines, the following attributes apply:
Drawing Attribute
Line width
Broken line
Anti-alias
18.10.6.2
Triangle drawing attributes
In drawing triangles, the following attributes apply (these attributes are disabled in high-speed
2DTriangle). Texture mapping and tiling have separated texture attributes:
Drawing Attribute
Shading
Alpha blending
Alpha blending coefficient
How to set gray scale gouraud shading
1.
Set Frustum bit of GMDR0 register to 0.
2.
Set identity matrix.
3.
Set MDR2 register to the below.
SM bit = 1, ZC bit = 0, ZW bit = 0, BM bit = 00, TT bit = 00
4.
Set GG bit of MDR7 register to 1.
5.
Execute drawing by same method as a direct color gouraud shading object.
Note: - Please don't use G_BeginE command.
6.
Set GG bit of MDR7 register to 0 after rendering
18-162
Line Drawing Attributes
Description
Line width selectable in range of 1 to 32 pixels
Specify broken line pattern in 32-bit data
Line edge smoothed when anti-aliasing enabled
Triangle Drawing Attributes
Description
Gouraud shading or flat shading selectable
In case of indirect color mode, gray scale gouraud shading is
possible.
Set alpha blending enable/disable per polygon
Set color blending ratio of alpha blending
- Please don't use floating data format in G_Vertex command.
- R (red) parameter is used as a color parameter
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