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grahambates / gradient-blaster

Web-based tool to build gradient data for retro platforms using a visual editor
https://gradient-blaster.grahambates.com
MIT License
17 stars 0 forks source link

Atari ST palette data is incorrect #1

Closed evldhs closed 2 years ago

evldhs commented 2 years ago

There are 4-bit nibbles produced also in Atari ST palette mode (should be 3-bit).

How to see the bug:

  1. Launch the tool
  2. Switch to Atari ST

See datas such as : dc.w $ff0,$ff0,$ff0,$ff0,$ff4,$ff3,$ff3,$ff4 dc.w $ff3,$ff3,$ef5,$ff5,$ef4,$ef5,$ef5,$ff5 ... ST should be 0-7 only.

If the first control colour is black, it will fade with ST colours until it reaches the next control colour and then start to output 4-bit nibbles. If the end control colour is black, the last part of the fade will be correct. So it seems fades going from or to black works fine, otherwise not.

grahambates commented 2 years ago

Thanks for flagging. I'd broken this when adding the amigaOcsLace mode. Time for unit tests I think!