Difference between revisions of "Clip Window Sprites Register"
From SpecNext official Wiki
(Adding details how sprite clipping works in "over border" mode.) |
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# read/write: Y2 position | # read/write: Y2 position | ||
| − | The values are 0,255,0,191 after a Reset | + | The values are 0,255,0,191 after a Reset. |
Clip window on Sprites works by default only when the "draw over border" is disabled. With "over border" enabled, the clip window must be enabled extra by bit 5 in {{NextRegNo|$15}}, and X-axis coordinates of clip-window are then doubled, see the {{NextRegNo|$15}} for details and example. | Clip window on Sprites works by default only when the "draw over border" is disabled. With "over border" enabled, the clip window must be enabled extra by bit 5 in {{NextRegNo|$15}}, and X-axis coordinates of clip-window are then doubled, see the {{NextRegNo|$15}} for details and example. | ||
The current read/write index (which coordinate is next) can be read or reset by {{NextRegNo|$1C}}. | The current read/write index (which coordinate is next) can be read or reset by {{NextRegNo|$1C}}. | ||
Revision as of 12:53, 23 December 2018
| Number | $19 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Sets and reads clip-window for Sprites |
- read/write: X1 position
- read/write: X2 position
- read/write: Y1 position
- read/write: Y2 position
The values are 0,255,0,191 after a Reset.
Clip window on Sprites works by default only when the "draw over border" is disabled. With "over border" enabled, the clip window must be enabled extra by bit 5 in Sprite and Layers System Register ($15), and X-axis coordinates of clip-window are then doubled, see the Sprite and Layers System Register ($15) for details and example.
The current read/write index (which coordinate is next) can be read or reset by Clip Window Control Register ($1C).