AMNESIA '98 mod for Amnesia: The Dark Descent

AMNESIA '98 is an audio-visual mod that makes Amnesia: The Dark Descent look and sound like a PS1 game, by way of shader rewrites and map edits, as well as completely remade music and down-sampled sound effects.

Originally this was just something I was messing around with to see if I could create PS1-style rendering entirely with shaders, but I liked the results so much that I figured I'd polish it up and release it in time for Halloween (which didn't work out, but it's the thought that counts). Even managed to rope a friend into redoing all the music for me, which I hadn't initially planned on doing at all, but it makes for a much more complete package.

Currently this only supports the base game. Justine support will only take a bit of work, so that's probably coming soon. Custom stories, however, will require a stripped-down version of the mod, as certain effects require map edits to work correctly (namely vertex rounding and UV warping, which require planes to be subdivided into smaller sections), so those effects need to be lessened or stripped out to work with all custom stories.

PSX Graphics Features:

• Vertex wobble and texture warping.
• 15-bit textures and lighting, with Bayer dithering.
• 1/4 resolution downscaling.
  • This isn't exactly optimal, but was done for simplicity and convenience. Downscaling after rendering ensures that the image is always sharp and has pixel-perfect scaling, and functions correctly regardless of display resolution or aspect ratio.
• Short draw distances with fog and overly-aggressive culling.
• Normal maps? Specularity? Mipmaps? Never heard of 'em.
• Greatly reduced decals and particle systems.
• Absurdly low FOV.
• Simplified special effects.
• Lots of other small things.

PSX Audio Features:

• All music completely remade using period-appropriate synths and authentic 90s cheese.
• Sound effects resampled at lower rates.