Deep Dungeon Adventure - source code

Thanks for sharing!

Kudos

When I seay spin off I mean something like this
https://www.youtube.com/watch?v=cCHTVC-Ptio
(graphic is a placeholder and code has to be redone from scratch)

ARTRAG - no plans to continue the stuff from that video?

Nice demo, Arturo!

By the way: I did not know the *final* Intruder version that was included in this release.

Congratulations for publishing the source code: it is good news to all developers and beginners out there. Thank you.

like+1

ARTRAG - no, I think it just looks spectacular What is the frame rate?

Screen 5 with double buffering and differential update.
Your idea sounds interesting but it needs managing different lists to be built and stored during the pseudo raycasting.
Actually we are confident that some relevant optimization can be achieved by integrating the pseudo raycast with differential update of the screen.
Currently the things are done sequentially, so during differential plotting, it is possible to find the vdp busy in its previous command. Integrating the two tings would increase the parallelism between cpu and vdp.
Moreover the current implementation needs an intermediate buffer that has to be reset at each fame.
Integration would allow to test for differential update only the new visible area, instead of the whole 24x24 screen (like now). With small modifications to the raycasting, counting on the fact the player moves a tile at time, it possible to avoid the reset of the intermediate buffer and the buffer itself.
Add that the raycast code is from DDA with almost no changes from 2008, so some optimization can be achieved also there and I do not exclude that redesigning from scratch the whole thing integrated would allow other speed gains.

Impressive! Too bad MSX1 is discontinued, but you showed us the way

@ARTRAG.
the game not lacks fps, it lacks scroll.
applying scroll register would make better game plus 60 fps world move.

I think this view makes it relatively easy adding:
"the game makes a new 8x8 position as before, the interrupt gonna walk that line with scrollregister".
like, the scroll walks on a grid.
similar to the grid happening in your parallax scroll demo. but this time an 8x8 pixel grid.
the player as hardware sprite could be decoupled and within some window push the scroller as so many games do.

15fps... would be 4 scroll steps of 60hz scroll register.
using full 16pixels scrollregister range, would be a scroll speed of 4 pixels per frame while 60fps!?
The result somehow surprises. I guess this means the screen 5 scroll going 2 pixel per frame is blittercopy having "render rate" of 7.5 fps.

So... your game could get 60fps 2 pixels per second scroll with suddenly 50% cpu free!?
But then this would be with 16x16 grid. The render would jump 16 pixels.
As is, could try an 8x8 grid at 100% cpu.
Maybe one can go 1.5 pixel per frame (with maybe some new logic issues entering the scene when it not exactly hits an 8x8 position), would free 33% cpu.

I've found an ancient DDA version with SCC support. Just plug in slot 2 an scc chartridge
https://github.com/artrag/DDA-scc
The work on music is not complete but better to share the rom as it is than let the whole work go lost.

I publish its sources, in case someone wants to give a peek