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★ HARDWARE Manual ★ VDP1 User's Manual ★ Chapter 7 Commands

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VDP1 User's Manual / Chapter 7 Commands

■ 7.4 Fixed sprite drawing command

The fixed sprite drawing command draws a character pattern in the framebuffer. When drawing, the character pattern can be flipped vertically or horizontally to the specified coordinates.
This is a standard sprite drawing command when the end bit is 0B and the command selection bit is 0000B. Fixed sprites cannot be rotated 90 °. If you want to rotate it 90 °, specify it with the transform sprite drawing command.
The contents of the command table are as follows:

bit 15 14 13 12 11 Ten 9 8 7 6 5 4 3 2 1 0 CMDCTRL +00 0 JP 0 0 0 0 0 0 Dir 0 0 0 0 CMDLINK +02 LINK designation / 8H 0 0 CMDPMOD +04 MO 0 0 0 Pc Cl Cm Me EC SP Color mode Color calculation CMDCOLR +06 Color bank, color look-up table / 8H (LSB fixed to 00) CMDSRCA +08 Character address / 8H CMDSIZE + 0A 0 0 Character size X / 8 Character size Y / 8 CMDXA + 0C Sign extension Vertex (A), X coordinate (XA) CMDYA + 0E Sign extension Vertex (A), Y coordinate (YA) +10 +12 +14 +16 +18 + 1A CMDGRDA + 1C Gouraud shading table / 8H 【note】 Is ignored (don't care)

The standard sprite drawing command is defined as follows.

If you set the end bit to 0B and the command selection bit to 0000B, it becomes a standard sprite drawing command. Specify the jump format. When the jump format is assign or call, divide the address of the command table to be processed next by 8H and set it to CMDLINK. Set the reading direction of the character pattern. You can draw by flipping vertically or horizontally by specifying the reading direction. Set pre-clipping. Consider the clipping area and the drawing position of the part, and specify whether it is enabled or disabled. Specifies the user clipping enabled bit and the clipping mode. Specifies whether user clipping is outside or inside in clipping mode. Set mesh enabled, end code disabled, and transparent pixel disabled. Sets the MSB on for shading or windowing in VDP2. Sets the color mode that defines the character pattern. Specify the color bank when the color mode is color bank mode. In lookup table mode, define the color lookup table address by dividing it by 8H. Specifies the color operation. Color calculation is valid in RGB mode. If you do not want to perform color calculation, specify replacement. When performing Gouraud shading processing, specify the address of the Gouraud shading table by dividing it by 8H. Gouraud shading processing is effective in RGB mode. Divide the address of the character pattern table by 8H and define it in CMDSRCA. Define the horizontal and vertical of the character size defined in the character pattern table in CMDSIZE. The horizontal size defines the value divided by 8. Define the upper left coordinates of the area to be drawn at vertices (A) (CMDXA, CMDYA).

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★ HARDWARE Manual ★ VDP1 User's Manual ★ Chapter 7 Commands