PTDS (formerly PED81C) - pseudo-native, no C2P chunky screens for AGA

[saimo]

Everyone can now try the last demo on their Amigas: it's available for download at https://retream.itch.io/ptds.

P.S. If you try it on a CRT, post pictures and let everybody enjoy the view, please!

[saimo]

I made this PTDS proof-of-concept program many months ago, but I couldn't bother releasing it until today.
It produces an effect of movement over a variable terrain. The terrain is rendered by means of perspective-correct texture mapping, according to a looping sequence of textures (Texequencer = Textures + Sequencer), on a triple-buffered 319x200 PDTS screen, using the RGBW color model.
Apologies for the dull textures :p

https://www.youtube.com/watch?v=jjlDSB958bQ

NOTES
* On a stock Amiga 1200, the speed alternates between 26 and 27 fps.
* On an Amiga 1200 equipped with a Blizzard 1230 IV mounting a 50 MHz 68030 and 60 ns FAST RAM, the speed alternates between 89 and 90 fps.
* YouTube's encoding degraded the quality.

Download: https://retream.itch.io/ptds

[saimo]

I have just released yet another demo (months ago I had shown a video, but I had not released the program itself):

https://www.youtube.com/watch?v=t7G2gKNQyII

The terrain is rendered by means of perspective-correct, wrap-around texture mapping. The city is rendered by means of solid bitmap zooming. The UFO is rendered by means of zero-keyed bitmap zooming. The screen uses PTDS, is 319x200 dots and employs the RGBWa color model.
On a stock Amiga 1200, the speed varies between 19 and 23 fps. On an Amiga 1200 equipped with a Blizzard 1230 IV mounting a 50 MHz 68030 and 60 ns FAST RAM, the speed varies between 67 and 80 fps. The fps fluctuations depend on the fact that the size of the UFO goes from very small (thus requiring only a few RAM accesses) to very large (requiring a lot of RAM accesses).

Download: https://retream.itch.io/ptds