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

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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 Once the object has stopped moving or is no longer active, the sprite shifts back to its "real" location.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.
 
[[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 Once the object has stopped moving or is no longer active, the sprite shifts back to its "real" location.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.
  
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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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An extreme version of this glitch is also present in [[FS-UAE]], a multi-platform Amiga emulator, causing the [[Horizontal graphics distortion|entire horizontal space aligned with an object to jiggle or sheer]].
  
 
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 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.
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This glitch also affects the brush in [[Graffiti]] mode.
 
This glitch also affects the brush in [[Graffiti]] mode.
  
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== Cause and partial fix ==
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== Cause ==
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A partial fix for this issue could be found in the '''Resolution''' toggle in the '''Display''' settings in WinUAE. By default, this is set to "Hires (normal)". By changing this to "Lores", the issue appears to resolve itself. The downside is that the main menu will be rendered at a lower resolution, and this may also affect other Amiga games, as well as Workbench.
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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 this to "Lores", the issue appears to resolve itself. The downside is that the main menu will be rendered at a lower resolution, and this may also affect other Amiga games, as well as Workbench.
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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.
 
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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The issue is no longer present in WinUAE as of version 4.1.0.
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'''''TODO:''' Find out if FS-UAE has a comparable setting.''
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Revision as of 03:59, 22 July 2020

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, causing the entire horizontal space aligned with an object to jiggle or sheer.

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

A partial fix for this issue could be found in the Resolution toggle in the Display settings in WinUAE. By default, this is set to "Hires (normal)". By changing this to "Lores", the issue appears to resolve itself. The downside is that the main menu will be rendered at a lower resolution, and this may also affect other Amiga games, as well as Workbench.

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.

The issue is no longer present in WinUAE as of version 4.1.0.

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