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Smooth horizontal scrolling is not implemented #334

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JorisVanEijden opened this issue Jun 17, 2023 · 1 comment
Open

Smooth horizontal scrolling is not implemented #334

JorisVanEijden opened this issue Jun 17, 2023 · 1 comment
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compatibility Emulator compatibility with DOS apps feature request This would be good to have hardware hardware device (can be virtual) emulation video Emulator video mode or video device related

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@JorisVanEijden
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JorisVanEijden commented Jun 17, 2023 •
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Describe the bug
VGA has a number of bit panning registers that can be used to achieve pixel-perfect smooth horizontal scrolling,.
This has not been implemented in the current renderer.

To Reproduce
Run the attached program.
balls.zip

Expected behavior
The horizontal scrolling movement should me pixel-smooth, not jump 8 pixels at a time.

Additional info
http://www.osdever.net/FreeVGA/vga/vgafx.htm#smooth
@JorisVanEijden JorisVanEijden added video Emulator video mode or video device related hardware hardware device (can be virtual) emulation labels Jun 17, 2023
@maximilien-noal maximilien-noal added feature request This would be good to have compatibility Emulator compatibility with DOS apps labels Jun 17, 2023
@maximilien-noal
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SNOOP is a nice utility to get information about our VGA card from the emulated point of view:

https://github.com/juj/crt_terminator/tree/main/DOS/SNOOP

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compatibility Emulator compatibility with DOS apps feature request This would be good to have hardware hardware device (can be virtual) emulation video Emulator video mode or video device related
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