Fujitsu MB86R02 Jade-D Hardware Manual page 536

Graphics controller

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MB86R02 'Jade-D' Hardware Manual V1.64

G_Vertex/G_VertexLOG/G_VertexNopLOG (Format 1)

When data format is floating-point format

When data format is fixed-point format

When data format is packed integer format

The G_Vertex command sets vertex parameters and processes and draws the geometry of the

primitive specified by the G_Begin* command. Note the following when using this command:

• Required parameters depend on the setting of the GMDR0 register. Proper values must be set as

the mode values of the MDR0 to MDR4 registers to be finally reflected at drawing. That is, when "Z"

comparison is made (ZC bit of MDR1 or MDR2 = 1), the Z bit of the GMDR0 register must be set to

1. When Gouraud shading is performed (SM bit of MDR2 = 1), the C bit of the GMDR0 register must

be set to 1. When texture mapping is performed (TT bits of MDR2 = 10), the ST bit of the GMDR0

• When the Z bit of the GMDR0 register is 0, input "Z" (Zoc) is treated as "0".

• Use values normalized to 0 and 1 as texture coordinates (S, T).

• When the color RGB is floating-point format, use values normalized to 0 and 1 as the 8-bit color

value. For the packed RGB, use the 8-bit color value directly.

• The GMDR1 register is valid only for line drawing; it is ignored in primitives other than line.

• The GMDR2 register matters only when a triangle (excluding a polygon) is drawn. At primitives other

than triangle, set "0".

• The use of both G_BeginE to G_EndE and G_VertexLOG/NopLOG is not assured.

• G_VertexNopLOG, except for the primitive as point is not assured.

• A vertex data is processed at every time. For example, the MB86R02 'Jade-D' draws interpolation of

bold line joint, edging line, shadows at every vertices.

• Alpha parameter can be provided only packed ARGB format.