Difference between revisions of "Active sprites rendered one pixel to the right of actual location"

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{{ParentArticle|[[Tricks and glitches (first generation)]]}}
 
{{ParentArticle|[[Tricks and glitches (first generation)]]}}
  
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[[File:WDC-halfpixel.jpg|200px|thumb|right|The glitch occurring at the half-pixel level (or "Hires" mode) in [[WinUAE]] 4.0.0.]] In [[WinUAE]], the sprites for worms, projectiles, mines and in-motion gravestones are shifted to the right by one pixel, resulting in an inaccurate representation of the object's current location. Once the object has stopped moving or is no longer active, the sprite shifts back to its "real" location. This issue is still present as of WinUAE 4.0.0.
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[[File:WDC-halfpixel.jpg|200px|thumb|right|The glitch occurring at the half-pixel level (or "Hires" mode) in [[WinUAE]] 4.0.0.]] In [[WinUAE]], the sprites for worms, projectiles, mines and in-motion gravestones can be shifted to the right by one pixel, resulting in an inaccurate representation of the object's current location. Once the object has stopped moving or is no longer active, the sprite shifts back to its "real" location. This issue is still present as of WinUAE 4.0.0.
  
 
An extreme version of this glitch is also present in [[FS-UAE]], a multi-platform Amiga emulator - the entire horizontal band of the display - terrain, mountain background and all - is shifted by one pixel to the right. This is also present in the GUI, suggesting the possibility that WinUAE is not accurately displaying the [[wind]] and weapon power levels.
 
An extreme version of this glitch is also present in [[FS-UAE]], a multi-platform Amiga emulator - the entire horizontal band of the display - terrain, mountain background and all - is shifted by one pixel to the right. This is also present in the GUI, suggesting the possibility that WinUAE is not accurately displaying the [[wind]] and weapon power levels.
  
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Curiously, this glitch appears to affect sprites at the ''half-pixel'' level. The Amiga's native "Hires" mode halves the horizontal width of pixels, resulting in rectangular pixels and more horizontal detail. WormsDC uses this mode on the menus, but appears to use the Amiga's default "Lores" mode in-game. It's therefore unusual that WinUAE and FS-USE would render this error at a Hires pixel depth, unless WormsDC is doing something sneaky with the screen mode.
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This glitch can appear to affect sprites at the ''half-pixel'' level, thanks to the Amiga's two default resolutions - Lores, which renders more-or-less square pixels, and Hires, which renders pixels at half the width, allowing for more horizontal detail.
  
 
This glitch also affects the brush in [[Graffiti]] mode.
 
This glitch also affects the brush in [[Graffiti]] mode.
  
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== Possible fix ==
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== Cause and fix ==
  
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A temporary solution for this bug is to change the '''resolution''' setting on WinUAE's '''Display''' settings from "Hires (normal)" to "Lores". This resolves the issue in normal play but, as a side-effect, reduces the pixel depth of the menu interface.
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The cause of this glitch is the '''Resolution''' setting in the '''Display''' settings in WinUAE. By default, this is set to "Hires (normal)". By changing the adjoining '''Resolution autoswitch''' from "Disabled" to "Always on" (which, when done, grays out the Resolution dropdown), the setting will adjust itself during play and the pixel-shift glitch vanishes.
  
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Changing this setting to SuperHires results in a version of this glitch that occurs on the ''quarter-pixel'' level, with Worms that come to a stop appearing to "settle" into a particular position that can be off by a quarter-pixel.
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Changing the Resolution setting to SuperHires results in a variant of this glitch that occurs on the ''quarter-pixel'' level, with Worms that come to a stop appearing to "settle" into a particular position that can be off by a quarter-pixel.
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As yet, the relevant setting has not been found in FS-UAE.
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'''''TODO:''' Find out if FS-UAE has a comparable setting.''

Revision as of 06:55, 1 July 2018

The glitch occurring at the half-pixel level (or "Hires" mode) in WinUAE 4.0.0.
In WinUAE, the sprites for worms, projectiles, mines and in-motion gravestones can be shifted to the right by one pixel, resulting in an inaccurate representation of the object's current location. Once the object has stopped moving or is no longer active, the sprite shifts back to its "real" location. This issue is still present as of WinUAE 4.0.0.

An extreme version of this glitch is also present in FS-UAE, a multi-platform Amiga emulator - the entire horizontal band of the display - terrain, mountain background and all - is shifted by one pixel to the right. This is also present in the GUI, suggesting the possibility that WinUAE is not accurately displaying the wind and weapon power levels.

This glitch can appear to affect sprites at the half-pixel level, thanks to the Amiga's two default resolutions - Lores, which renders more-or-less square pixels, and Hires, which renders pixels at half the width, allowing for more horizontal detail.

This glitch also affects the brush in Graffiti mode.

Cause and fix

The cause of this glitch is the Resolution setting in the Display settings in WinUAE. By default, this is set to "Hires (normal)". By changing the adjoining Resolution autoswitch from "Disabled" to "Always on" (which, when done, grays out the Resolution dropdown), the setting will adjust itself during play and the pixel-shift glitch vanishes.

Changing the Resolution setting to SuperHires results in a variant of this glitch that occurs on the quarter-pixel level, with Worms that come to a stop appearing to "settle" into a particular position that can be off by a quarter-pixel.

As yet, the relevant setting has not been found in FS-UAE.

TODO: Find out if FS-UAE has a comparable setting.

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