Here is a simple bulletchip replacement patch. There are some textures in Doom that have bullet holes, chips, and blemishes baked into them. I cut them out, formatted them to work well as GZDoom decals, and that's about it. These work great in the hardware renderer, but not great in the software renderer due to how it handles the alpha channels in .png files. Blood decals featured in screenshot is from Nash's own decal pack.