Sprite Attribute Upload: Difference between revisions

Revision as of 16:56, 28 August 2017

Number	PortNumber::$xx57
Decimal	NumberDec::
Short desc.	ShortDesc::Uploads sprite positions, visibility and effect flags.
Bit Mask	PortMask::%---- ---- 0101 0111
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")

@@ Line 2: / Line 2: @@
 |Number=$xx57
 |ShortDesc=Uploads sprite positions, visibility and effect flags.
+|PortMask=%---- ---- 0101 0111
 |Readable=No
 |Writable=Yes