Mip Maps

Mip maps

Textures with flag 8 get a chain of mip maps and are sampled with trilinear filtering, which blends between two levels. The levels are made by averaging 2 by 2 texels, so masked (flag 4) and alpha textures average their alpha as well, which is also what the original did and makes their edges soft from afar. The levels of a texture that is drawn on (TextureBuffer) are made again before the texture is next used in a scene. The levels that are stored in a block compressed DDS file are used instead of made ones. The frames of a texture (LoadAnimTexture, CreateTexture with frames) are the layers of one image and each has levels of its own, so the levels never blend frames (only a block compressed or deep picture loaded with LoadAnimTexture stays a sheet, and then they do). Flag 8 alone does not use anisotropic filtering, but a texture can be given it with a sampler (CreateSampler, SetSamplerAnisotropy and SetTextureSampler), which the originals had no way to do:

tex = LoadTexture("floor.png", 1 + 8)
sampler = CreateSampler()
SetSamplerAnisotropy sampler, 8
SetTextureSampler tex, sampler

See Samplers for the rest of the settings.