To change reolution of this game, you need to go to the folder where the game installed.

This can be

c:\Steam\steamapps\common\Requiem Avenging Angel

depending on where you installed your game.

inside the folder there is a file named

nGlide_config.exe

double click it, and you can set graphic options for the game.

and do NOT change resolution inside the game. you should set 640x480 in the game, which is default, to keep the settings you choose on nGlide.

im using nvidia graphics card, and this guide works flawlessly for me, i dont know about ati, but it should work on ati too.

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After several trials and errors, i found out that this game works better with dgvoodoo wrapper.

download dgvoodoo from its homepage, and copy glide.dll, glide2x.dll, glide3x.dll AND DDraw.dll to the game folder, and run the game by clicking 3DFX.exe directly from the folder. i can get 1920 x 1080 resolution and 144 FPS at the same time. i just leave this short note here in case someone tries to get 144 fps.