23.Jun.2023
Amiga.org (forum)
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PED81C: Pseudo chunky screens on AGA Amigas (Update)
The Amiga's bitplane-based graphics, in which the color information for each pixel on a screen is captured as two-dimensional layers and, for scrolling, each layer (bitplane) is changed by the exact same value so that each pixel also gets the same color again, is memory-efficient but slow for individual changes and, with the advent of 3D graphics and fast memory on graphics cards, has fallen behind the chunky display of PCs and Macs.
With PED81C ("Pixel Elements Dots, 81 Colors") by Simone 'saimo' Bevilacqua there is an approach described in detail in the documentation in the archive at the title link to work on AGA Amigas with pseudo-native chunky screens without performing the known chunky-to-planar conversions when displaying 3D graphics or any other slowing down additional calculations by CPU or custom chips (Copper, Blitter) at all.
Videos at the title link demonstrate the effects made possible by the fact that chunky-like each dot on the screen is defined by its own byte in Chip RAM. Among the examples included there is also one showing how to use a PED81C display in AMOS programs.
Update: (09:22, 25.06.23, snx)
Mistake corrected regarding bitplane scrolling. (snx)
[News message: 23. Jun. 2023, 10:35] [Comments: 0]
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