Sprite low-level access to VDP...

[TakaIsSilly]

Hn... here's my problem. I need a proprietary sprite engine, so I'm not using the "texture" approach the library come with.

I create the correct sprite data, generate a command table that VDP1 likes, but how do i register it with the processor itself - like setting up where the command sprite table begins? Satourne seems to have some sort of relative adress attached to that adress, and there's this SPRITE_VRAM thing on the sample that uses sprites - yet I can't make heads or tails of it. Anyone has the important registers for the VDP1 handy?

 

[antime]

The first drawing command is always at the start of VDP1 RAM. The register definitions can be found in the VDP1 manual.

 

[ExCyber]

I can't be 100% sure because I'm only skimming the manual here, but try putting your initial command table at 0x25E00000 (i.e. the beginning of VDP1 VRAM) and write 0x01 to 0x25D00004 (PTMR; plot mode register) to begin drawing.

 

[antime]

Charles MacDonald has a no-library sprite demo on his page.

 

[Runik]

Actually the start of VDP1 VRAM is located at 0x25C00000, so you should place your first command table here.

0x25E00000 is the start of the VDP2 VRAM