Falcosoft wrote on 2026-02-23, 15:39:

BTW, here is the modified version that works in both 32 and 24-bit modes regardless of the bytes per scanline value:

The attachment CRAY32_mod2.zip is no longer available

You can add your modifications to it as you like. The relevant changes are in GHX.H, GFX.C and CRAY32.C. All changes are related to the new function 'get_scanline_bytes()'.

I had some troubles with DOSBox-Staging for Linux... I don't like those snaps, flatpacks etc., but there's no deb-packages or official repository for normal install. I tried snap-package with latest DOSBox-Staging version and it gave me "Illegal instruction" error 🙁 At the end I downloaded last version, which supports win7 x64, and of course it's not the latest version of DOSBox-Staging. Is win7 x64 so obsolete?

Anyway, after the success with win7 version, I ran my C-Ray32 code with added your new function get_scanline_bytes() for latest 24-bit patch and now it works fine with most of the VESA modes. I had to change "vesa_modes=compatible" setting in DOSBox-Staging config file to "vesa_modes=all" in order to run the benchmark in 320x200 32-bit mode, but 320x200 24-bit is still a miss. All other standard resolutions up to 1024x768 (including) work fine in both 24 and 32-mode. So I can confirm, that your latest patch works fine, and that the original DOSBox and it's DOSBox-X fork are not that good in video modes emulation. So, thank you very much for the 24-bit mode C-Ray32 code fix and for pointing me to DOSBox-Staging (it really seems like ancestor of original DOSBox)!

And here is my latest variant of C-Ray32 bencmark based on Zoltan's 24-bit + 32-bit videomodes fixes:
EDIT: The newer version of C-Ray32 1.1_mod3 based on latest Zoltan's 24-bit videomodes fixes is here.

The last update of C-Ray32 benchmark.

Added some more output info after the rendering finish: screen resolution, bpp, rays per pixel, average rays per second. Also changed time format representation of rendering time to hours (if any), minutes (if any) and seconds(.milliseconds in decimal part with 3 digits precision).

Attachment for download:
EDIT: The newer version of C-Ray32 1.1_mod3 based on latest Zoltan's 24-bit videomodes fixes is here.

aVd wrote on 2026-02-27, 13:54:

The last update of C-Ray32 benchmark...

I totally forgot about the code for default scene input file "scene.txt" inherited from previous changes (it is missing in the original C-Ray32 code). It was just one line causing bug if file is missing:

1infile = fopen("SCENE.TXT", "rb");

Now this bug is properly fixed and this attachment is with updated source code and latest version executable:

Also here is attachment with my modified C-Ray16 version, which can run on XT machine with 8088 or 8086 CPU with or without FPU. The changes are too many to describe every single one of them here, but there are comments in the source code. The main functions resemble those of modified C-Ray32. I removed the strange dithering option for the rendered scene as it has no relation to benchmarking. It is compiled and linked with Borland C++ 3.1 IDE, so I can't provide all the command line switches or make-file for the compiler and linker, but it is optimized for speed: