Last Update: 2010/11/01 23:05 +0900
About DSP2 Gamepaks, Copyright Snes9x DSP Team 2003-2004. Maintained by Overload. (Added on May 03, 2004)
Anyway, this document is based on knowledge of DSP2 Gamepaks and published without its author's recommendation/permission. (Added on May 03, 2004)
DM will convert the packed-pixel bitmap image into bitplane image in tile unit.
There are 21 x 16 (336) tiles to be converted. Each tile has 8 x 8 and costs 32 bytes.
DM will totally send 10752 (32 * 336) bytes to DSP2 and receive 10752 bytes
from DSP2.
Totally it transmits 21504 bytes per display image format conversion between
console and DSP2.
This value is not actual due to overhead of command bytes.
Composite the two images into one.
This and later commands are invoked per scanline.
Make a mirror bitmap image.
Select a new color key.
Integer multiplication. Used to calculate the rendering offset position of opening door.
| Input/Output | Effect |
|---|---|
| 0 * 36 = 0 |  |
| 22 * 36 = 792 |  |
| 44 * 36 = 1584 |  |
| 66 * 36 = 2376 |  |
Image stretching.
| Meaning | Operation |
|---|---|
| Vertical stretching.
DM decides which scanlines are needed. |
 »  |
| Horizontal stretching.
Op0D performs horizontal stretching per scanline. |
»  |