Gameboy Development Forum
Discussion about software development for the old-school Gameboys, ranging from the "Gray brick" to Gameboy Color
(Launched in 2008)
You are not logged in.
Ads
#1 2021-02-18 02:17:25
- M2m
- Member
- Registered: 2021-02-18
- Posts: 27
Shitty 2.5D - PoC
I just started in GB dev like 2 weeks ago.
Made a 2.5D proof of concept in GBDK 2020 - with 5 walls. "Map" is at the top.
Main challenge is to get a screen redraw, which I couldn't get a decent solution so far - only one which induces heavy flickering. Not tested on real HW only BGB.
Also I didn't implement viewport clipping as of now.
Any tips for screen update appreciated. Also feel free to get the code and use it for whatever you think its helpful.
https://github.com/sttng/gb-stuff/tree/main/shitty-25D
Warning: Heavy Flicker if you test it in BGB !! Be careful if you are known to have records of photosensitive epilepsy
Offline
#2 2021-02-18 04:25:40
- toxa
- Member
- Registered: 2020-02-13
- Posts: 309
Re: Shitty 2.5D - PoC
line drawing on the game boy is a heavy task, because it has specific architecture and rather little resources. so, if you expect making doom that way - no, that won't be playable.
Offline
#3 2021-02-18 04:47:58
- M2m
- Member
- Registered: 2021-02-18
- Posts: 27
Re: Shitty 2.5D - PoC
Thanks for the reply. I'm quite surprised how far I got honestly. Without redraw (and the wireframe just 'smearing' over the screen) in this simple scene the framerate is much better then I expected. Given that I actually never developed any serious C, C++ or Assembler and that I'm also not a 3D engine expert I am pleasantly happy with the current state after 2 weeks.
My "solution" so far is effectively draw the scene 2x. One time the original and the 2nd time overwriting in white color, to clear the the scene. So basically I waste half of the framerate.
Anyway even if it will lead to nothing, I'm gonna learn something. So from that perspective I wont fail (even without a playable game) 
Offline
#4 2021-02-18 06:42:18
Re: Shitty 2.5D - PoC
Nice start but you really need switch to asm for better results / performance. Might want to check Jeff's APA Demo.
As for Doom, well... There's Tyrannosaurus Tex.
Offline
#5 2021-03-21 02:40:59
- M2m
- Member
- Registered: 2021-02-18
- Posts: 27
Re: Shitty 2.5D - PoC
Made some slight adjustments.
Can see some video here:
https://www.vrddit.com/?v=r/Gameboy/com … f_concept/
Offline
#6 2021-03-24 02:34:45
- M2m
- Member
- Registered: 2021-02-18
- Posts: 27
Re: Shitty 2.5D - PoC
Another small update. With some pseudo-clipping
https://www.vrddit.com/?v=r/Gameboy/com … itty_with/
Offline