libGMDXHook

Custom Direct3D11 replacement that intercepts GameMaker's allocation of texture atlases on the GPU and converts them from 8-bit RGBA to either BC7 or 4-bit RGBA.

Caution

This library is only recommended for use on low VRAM devices when absolutely necessary.
BC7 compression has artifacts and takes long to process, 4-bit RGBA has visible color banding.

Attributions

• BC7 Compressor: bc7enc_rdo - Copyright(c) 2020-2021 Richard Geldreich, Jr.
• Hashing Algorithm: xxHash - Copyright (c) 2012-2021 Yann Collet

How to use

• Add the gmdxh.dll file to your game folder of choice.
• Open the game executable in a hex editor like HxD.
• Locate the string d3d11.dll in the file.
• Replace the string with gmdxh.dll.
• The library should be ready! Try opening the game and observe VRAM usage.