wolfenstein 3d demo for sega genesis

**gasega68k** · 08-24-2013, 04:58 PM

This is a demo of wolfenstein for sega genesis written in asm that I've been working for about a year. Mostly is based on the source code of wolfenstein 3d for PC.

Here is a video of the demo (uploaded on aug 21, 2013):

http://youtu.be/BHtKv_cwgVk

And here is the rom:

http://www.4shared.com/rar/lr3GeFn4/...mo_wsound.html

Right now i'm working on the pushable walls, the player's hand/weapon and some other things (objects?). Very soon I will post an update of my demo.

**dr apocalipsis** · 08-24-2013, 05:10 PM

Looks promising. I wonder if you will end surpasing what Tectoy did with DukeNukem3D.

**Black_Tiger** · 08-24-2013, 05:13 PM

Looks amazing so far.

Hard to believe what some people are able to oull off in their own for fun.

**Da_Shocker** · 08-24-2013, 05:20 PM

I wanna see how it moves with sprites on screen but not a bad effort at all.

**TmEE** · 08-24-2013, 05:28 PM

**Yharnamresident** · 08-24-2013, 06:04 PM

Originally Posted by TmEE

NSFW

**kool kitty89** · 08-24-2013, 07:24 PM

There's been some dicussion on your demo here:
http://www.sega-16.com/forum/showthr...and-Raycasting

(which is what prompted me to comment in your spritesmind thread

)

Originally Posted by dr apocalipsis

Looks promising. I wonder if you will end surpasing what Tectoy did with DukeNukem3D.

I think he already has, at least in some respects. The current demo is only 247 kB, which implies it's not consuming tons of ROM space with large precalculated tables and similar memory-intensive CPU-time saving tricks.

It also seems to be fillrate bottlenecked rather than computationally bottlenecked given it runs faster in zoomed out wide open areas than closed-in ones (runs slower when against a single wall). This is more noticeable in fusion, since it jumps above 15 FPS a fair bit more often. (software rendered stuff in Fusion seems to rum closer to a 10 MHz overclock than stock MD, though not quite as fast as 12 MHz tends to run on real hardware)

And as I mentioned in the other threads, the fact this works in just 247 kB also has interesting implications for Sega CD software rendering (let alone games actually using the ASIC) working within its 512kB+256kB memory limits. (or 512kB+128kB in dual bank word RAM mode -which you can't use with the ASIC but is good for pure software rendering since you can flip banks and avoid word RAM contention between main and sub CPU)

**Bottino** · 08-24-2013, 09:19 PM

Originally Posted by dr apocalipsis

Looks promising. I wonder if you will end surpasing what Tectoy did with DukeNukem3D.

You know, i got Duke 3D when the game came out here and so far his demo already looks better. I'm really looking forward to see his progress.

**NeoVamp** · 08-24-2013, 10:26 PM

Awesome, just awesome.

I really hope the sprites won't slow down things, because this is one of those projects that just show off the power of the Genesis.

**kool kitty89** · 08-25-2013, 12:30 AM

Missed the frame counter on Tiido's screenshot above. I assume that's on a flash cart, so it seems I was a bit off with my Fusion speed comments. Fusion tops out (in select conditions) at 20 FPS as well, with 15 FPS being the minimum.

I was also wrong about the game being fillrate limited and fastest with the BG way zoomed out. It's fastest when sort of in-between, but slows down when really close to walls or far enough away to show most of a large room. (seems fastest when near the middle of a large room facing and a corner) So I assume I'm seeing both cases of fillrate and computational bottlenecks there. In any case, it never drops below 15 FPS.

Also, per the comments about using horizontal blur/blending (via scrolling) that I mentioned on Spritesmind and the Catacomb 3D thread here, here's some screenshots in fusion comparing blur. (CVBS filter should be quite similar to H-scroll blur effect)

Also note that you'd only have to blur the window, not the boarder/status display, at least if you used separate layers for that. (or just use cell scrolling on a single layer -you'd blur the boarder, but not the text/display below the window)

32x Doom also could have hidden the dithering using H-scroll like that. (they really didn't need to dither though, posterizing the palette to 15-bit RGB would have worked fine, especially since they didn't use gradient lighting -just flat/solid per-sector shading)

Oh, and another neat thing to note is that the on-screen pseudo-color count (with CVBS filter) in the render window tends to be in the mid 70s, and not too far off from the PC version. (the screencaps of the SNES version I have also range in the mid 70s)
Actual color count will never exceed 16, of course.

I kind of wonder why Carmak didn't do 1/2 res like this for the Catacomb 3D engine games . . . would be better than limited EGA color. I think EGA has hardware scrolling too, so the blending method should work. (more so for the later 2 games with status bard below rather than to the side)
Not to mention how much halving the column count would speed up rendering. (having a Doom style low detail mode in DOS Wolf 3D would have been nice too, much better than just the screen resizing -3DO Doom has the same problem, screen resizing but no low detail mode, otherwise it could run 2x as fast)

**saturndual32** · 08-25-2013, 12:46 AM

This is great!, just tried it on my flashcart.
Just a few weeks ago an impressive port of Wolfenstein 3d was shown for one of my favorite portables, the Lynx. And now this awesome port is shown for my favorite console evah. Cant be happier right now!

**TmEE** · 08-25-2013, 12:57 AM

Hscroll stuff makes the image noticably wobble, and I am quite sure many folks will get a headache from that. There's also missing rainbow banding in the simulations :P

**kool kitty89** · 08-25-2013, 01:58 AM

Originally Posted by TmEE

Hscroll stuff makes the image noticably wobble, and I am quite sure many folks will get a headache from that. There's also missing rainbow banding in the simulations :P

Rainbow banding wouldn't be there in RGB+hscroll though.

As for jiggling, wouldn't that be less noticeable in 60 Hz? (it should be about the same as the 60 Hz flicker/shimmer color faking methods, and those don't seem too bad) Mortal Kombat's FMV on the MCD uses v-scroll for the same sort of effect too.
50 Hz and H32 would probably look the worst due to the wider pixels making things jiggle more.

Hell, wouldn't the jiggling in general be similar to that of normal interlacing on a TV? (which IS noticeably, but certainly tolerable -otherwise TV couldn't have been done that way

)
And in H40 in NTSC, the pixels are actually narrower than the scanlines, so it should be even finer (less jiggly) than interlacing.
In PAL, you've got a higher vertical resolution, so the lines would still be narrower than H40 pixels . . . also probably one of the reasons 25/50Hz flicker/jiggle is tolerable in PAL. (that and I assume longer persistence phosphor in the shadow mask)

And if you were going to blend vertically, and do something PAL-specific, you could exploit the 2-line chroma accumulation in PAL to fake more colors/shades at full 50 Hz too. (some Atari 8-bit demos do that to fake 256 colors/shades, including the Wold3D style Project M -do one scanline of color/hues and another of luminance/shades and let PAL blend it for you)
That won't work in RGB, of course, or NTSC either. (. . . though you could still approximate it via v-scroll)

**NeoVamp** · 08-25-2013, 05:57 PM

Just tried the demo out on my Modded Mega Drive, it runs super smooth!
the youtube clips while awesome just don't do it justice like seeing it for real.

I also took a looksie at the Snes version, and damn I don't remember it being so blocky!
if this port can be completed then it would be the ultimate Wolf3D port on the 16 bit consoles.

**Chilly Willy** · 08-25-2013, 07:39 PM

Originally Posted by NeoVamp

Just tried the demo out on my Modded Mega Drive, it runs super smooth!
the youtube clips while awesome just don't do it justice like seeing it for real.

I like running on real hardware as often emulators don't quite capture the real thing. For example, 32X audio sounds MUCH better on real hardware than in emulators.

I also took a looksie at the Snes version, and damn I don't remember it being so blocky!

You were probably using a 13" TV like I was.

Now-a-days, we all use 24" to 56" LCD computer monitors that just happen to also accept TV inputs.

if this port can be completed then it would be the ultimate Wolf3D port on the 16 bit consoles.

I'm REALLY impressed with this so far. As Kitty said, I'd like to see this on the SegaCD.

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