Scanline effects: Difference between revisions

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[[File:Sengoku2persp.png|frame|[[Sengoku 2]] changes the shrinking and the position of a scrolling sprite block in its intro to create a mirror and perspective effect.]]
[[File:Sengoku2persp.png|frame|[[Sengoku 2]] changes the shrinking and the position of a scrolling sprite block in its intro to create a mirror and perspective effect.]]
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Special tricks using the [[68k interrupts|raster line interrupt]] to distort [[sprites]] horizontally or vertically.


These effects are very CPU consuming as they can be triggered at very tight intervals during active display. Consequently, they may have to use tables of precomputed values (constants, or calculated during the VBlank) to be applied fast enough.
Scanline effects are special tricks using the [[timer interrupt]] to distort [[sprites]] by updating their coordinates or shrink values mid-screen.


[[Neo Turf Masters]] relies exclusively on this effect to render the playing field.
These effects can be very CPU consuming as they can be triggered at tight intervals during active display. Consequently, they may have to use tables of precomputed values (constants, or calculated during the VBlank) to be applied fast enough.
 
[[Neo Turf Masters]] and [[Riding Hero]] heavily rely on this effect to render the playing field.


[[Category:Code]]
[[Category:Code]]
[[Category:Video system]]
[[Category:Video system]]

Latest revision as of 19:12, 5 March 2018

File:Sengoku2persp.png
Sengoku 2 changes the shrinking and the position of a scrolling sprite block in its intro to create a mirror and perspective effect.

Scanline effects are special tricks using the timer interrupt to distort sprites by updating their coordinates or shrink values mid-screen.

These effects can be very CPU consuming as they can be triggered at tight intervals during active display. Consequently, they may have to use tables of precomputed values (constants, or calculated during the VBlank) to be applied fast enough.

Neo Turf Masters and Riding Hero heavily rely on this effect to render the playing field.