Sprite Attribute Upload
From SpecNext Wiki
| Number | PortNumber::$xx57 |
|---|---|
| Decimal | NumberDec:: |
| Short desc. | ShortDesc::Uploads sprite positions, visibility and effect flags. |
| Bit Mask | PortMask:: |
| Readable | Readable::No |
| Writable | Writable::Yes |
| Subsystem | Subsystem::Sprites |
Uploads attributes of the sprite slot selected by {{#ask: PortNumber::$303B }} ($303B{{#ask: PortNumber::$303B |mainlabel=- |headers=hide |intro= / |?NumberDec#- }}). Attributes are in 4 byte blocks sent in the following order; after sending 4 bytes the address auto-increments to the next sprite. This auto-increment is independent of other sprite ports. The 4 bytes are as follows:
Byte 1 is the low bits of the X position. Legal X positions are 0-319 if sprites are allowed over the border or 32-287 if not. The MSB is in byte 3.
Byte 2 is the Y position. Legal Y positions are 0-255 if sprites are allowed over the border or 32-223 if not.
Byte 3 is bitmapped:
| Bit | Description |
|---|---|
| 4-7 | Palette offset, added to each palette index from pattern before drawing |
| 3 | Enable X mirror |
| 2 | Enable Y mirror |
| 1 | Enable rotation |
| 0 | MSB of X coordinate |
Byte 4 is also bitmapped:
| Bit | Description |
|---|---|
| 7 | Enable visibility |
| 6 | Reserved |
| 5-0 | Pattern index ("Name") |