Clip Window Sprites Register - Revision history

Specnext: 6 revisions imported

2019-04-14T09:59:51Z

6 revisions imported

← Older revision		Revision as of 10:59, 14 April 2019
(No difference)

wiki>Ped7g: Fixing read/write vs index auto increment description, thanks to Garry help on Facebook to identify the mistake

2019-01-06T23:20:59Z

Fixing read/write vs index auto increment description, thanks to Garry help on Facebook to identify the mistake

← Older revision		Revision as of 00:20, 7 January 2019
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	\|ShortDesc=Sets and reads clip-window for Sprites		\|ShortDesc=Sets and reads clip-window for Sprites
	}}		}}
	~~# read/write~~: X1 position		The coordinates are stored under index:
	~~# read/write:~~ X2 position		{\| class="wikitable"
	~~# read/write:~~ Y1 position		\|-
	~~# read/write:~~ Y2 position		! Index !! Coordinate
			\|-
			\| 0 \|\| X1 position
			\|-
			\| 1 \|\| X2 position
			\|-
			\| 2 \|\| Y1 position
			\|-
			\| 3 \|\| Y2 position
			\|}

	The values are 0,255,0,191 after a Reset.		The current read/write index (which coordinate is selected) can be read or reset by {{NextRegNo\|$1C}}.

			Write to register will modify currently selected coordinate, and auto-increment index (wrapping from 3 to 0).

			Read from register will only read currently selected coordinate, index is not modified (to read next coordinate, write the current coordinate value back, to increment index).

			The coordinate values are 0,255,0,191 after a Reset.

			The displayed area is "inclusive", i.e. for default values full 256x192 pixel area is displayed.

	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. Set it to {0,159,0,255} to cover whole pixel+border sprite area (320x256 pixels area of display) in the x-axis doubled mode. Although setting it larger (like {0,255,0,255}) should be safe operation and still the full 320x256 area for sprite pixels will be visible.		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. Set it to {0,159,0,255} to cover whole pixel+border sprite area (320x256 pixels area of display) in the x-axis doubled mode. Although setting it larger (like {0,255,0,255}) should be safe operation and still the full 320x256 area for sprite pixels will be visible.

	~~The current read/write index (which coordinate is next) can be read or reset by {{NextRegNo\|$1C}}.~~

wiki>Ped7g: extra bit of info from forums

2019-01-01T13:25:12Z

extra bit of info from forums

← Older revision		Revision as of 14:25, 1 January 2019
Line 12:		Line 12:
	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. Set it to {0,159,0,255} to cover whole pixel+border sprite area (320x256 pixels area of display) in the x-axis doubled mode.		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. Set it to {0,159,0,255} to cover whole pixel+border sprite area (320x256 pixels area of display) in the x-axis doubled mode. Although setting it larger (like {0,255,0,255}) should be safe operation and still the full 320x256 area for sprite pixels will be visible.

	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}}.

wiki>Ped7g: added example of maximum clip window in the over-border case.

2018-12-29T12:44:48Z

added example of maximum clip window in the over-border case.

← Older revision		Revision as of 13:44, 29 December 2018
Line 12:		Line 12:
	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. Set it to {0,159,0,255} to cover whole pixel+border sprite area (320x256 pixels area of display) in the x-axis doubled mode.

	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}}.

wiki>Ped7g at 12:53, 23 December 2018

2018-12-23T12:53:11Z

← Older revision		Revision as of 13:53, 23 December 2018
Line 10:		Line 10:
	# 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}}.

wiki>Ped7g: Adding details how sprite clipping works in "over border" mode.

2018-12-23T12:51:57Z

Adding details how sprite clipping works in "over border" mode.

← Older revision		Revision as of 13:51, 23 December 2018
Line 12:		Line 12:
	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}}.		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}}.

wiki>Ped7g: added info + Core 2.00.22 changes (readable now)

2018-12-22T18:45:03Z

added info + Core 2.00.22 changes (readable now)

New page

{{NextRegister
|Number=$19
|Readable=Yes
|Writable=Yes
|ShortDesc=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 {{NextRegNo|$15}}.