OS_SpriteOp 24 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_SpriteOp 15 – SWI Calls
» OS_SpriteOp 24 – Select sprite/Get addressOS
» OS_SpriteOp
» OS_SpriteOp 24 – Select sprite/Get address
OS_SpriteOp 24 – Select sprite/Get address
(SWI &2E)
| Entry | |
|---|---|
| R0 | 24 (Reason code) + Area value |
| R1 | Unused/Sprite area (as defined by area value in R0) |
| R2 | Sprite name/pointer (as defined by area value in R0) |
| Exit | |
|---|---|
| R2 | Pointer to sprite (if not system sprite area), else preserved |
| All other registers preserved | |
Use
This call has two uses, depending on the area value:
- If the system sprite area is used, this call will select which sprite should be used by the OS_Plot sprite operations (&E8-&EF). R2 will not be updated.
- If a user sprite area is used, this call will return in R2 the address of the given sprite. This makes the call useful as a method of finding the address of a sprite when you only have its name.
See also
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