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Re: Rendition Verite Thread

Posted on 2021-06-09, 09:56

I've checked that Rendition Veritè cards handle extremely bad Mode Y and Mode X video modes (testing FastDoom). More than I thought, is even worse than the Cyrix MediaGX integrated VGA core. https://www.youtube.com/watch?v=6unNuPympE4 Mode Y: 14.446 fps Mode 13h: 59.150 fps Mode VBE2 (LFB, PM): 305. …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-06-08, 23:48

Maybe you can test UniVBE 5.3 and the FDOOMVBR.EXE executable, it's the most compatible configuration for older video cards. I've tested an ATI Mach64 VT2 PCI and it works fine for me, using both UniVBE and the native VBIOS. I'll try 64vbe, maybe it's incompatible. I wish I had an ISA ATI Mach64 to …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-06-08, 21:01

Finally i've tested the Rendition Veritè V2200 on an AMD K6-2 550MHz. The result is insane. https://www.youtube.com/watch?v=6unNuPympE4 Mode Y: 14.446 fps Mode 13h: 59.150 fps (409% faster, seems to have applied VSync by hardware and locked to 60fps. FastDoom VSync option was disabled) Mode VBE2 ( …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-06-02, 16:21

Why does FastDoom have so much vsync/tearing issues in Mode13h whereas Heretic does not for example? Can this be fixed? I'll check if i'm doing different compared to Heretic and try to fix it, i'm still learning how to program video cards ^^ ... I guess some video cards optimizes internally the way …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-06-01, 17:38

Some video cards are just faster in VBE2 mode, don't know exactly why. For now it's using exactly the same code path as mode 13h (look at the latest commit in the VBE2 branch), only changes the video memory addresses (new memory address for LFB modes, and 0x40000 for banked modes) and the video mode …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-05-30, 01:59

Another crazy idea: Modern games use Dynamic resolution scaling (DRS) and Variable Rate Shading (VRS). FastDoom could have a mode where it monitors frame render times and dynamically switches between full, half and quarter resolution detail modes to keep FPS above certain number, like for example …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-05-28, 19:33

Do you have any example or implementation @BitWrangler? I haven't tested that kind of dithering implementation, I guess it's possible to implement but framerate is very variable in Doom when the cpu isn't fast enough, don't know how would that look. I'm still waiting for someone to port Doom to 16- …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-05-25, 15:52

@appiah4 What cards, configuration and ports are you using? I've tested a NEC XR385 and an Ensoniq SoundscapeDB on an Aztech card and it works without problems at port 330. BTW I'll update the readme file including all new command line options. Regardles mouse sensitivity, you can change it from in- …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-05-24, 21:54

@appiah4 it depends, some systems are faster with mode 13h and others not. Mode Y is the standard and it's valid for both slow and fast cpu's (thanks to potato and low detail modes). Also the mode 13h lacks page flipping and that causes screen tearing, problem that Mode Y doesn't have. @xcomcmdr DEH …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-05-24, 17:14

Aaaaand new release!! :D FastDoom 0.8.1 New video modes!! VGA Mode 13h (320x200 256 colors, without page flipping). Same mode as Heretic/Hexen. Only high detail mode is implemented, but it's usually faster than the original Mode Y. Recomended for fast 486 processors and upwards CGA (320x200 4 colors …

Re: Doom vs Heretic VGA performance difference

Posted on 2021-05-20, 17:17

Vanilla Doom only uses VSync when changing the VGA palette (Trident cards show garbage without this). FastDoom has this disabled, so both Mode Y and Mode 13h have VSync disabled in the comparison. I guess Doom uses Mode Y because of 386 and slow 486 processors and slow ISA VGA cards, as the Mode Y …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-05-19, 18:00

New comparison between Mode Y and Mode 13h on a slow 486 processor (Cyrix Cx486DX @33MHz, Cirrus Logic VLB video card). This result surprised me, didn't expected it. Now I understand why Heretic feels smoother than Doom on some computers. https://www.youtube.com/watch?v=InNNSd1peWk Mode Y: 16'429 …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-05-05, 07:13

And finally Hercules Graphics Card is supported. The original resolution of 320x200 is upscaled to 640x400, and then dithered using ordered dithering with a 4x4 Bayer matrix. I tried to implement a Sierra Lite dithering, but was too slow (although it looked incredible). My MCE2VGA doesn't support …

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