Doomsday Engine

Doomsday's Patch texture composition does not replicate the logic of the id tech 1 column/post based software renderer. In the original renderer posts are automatically enlarged to encompass the full range of a Patch column. Therefore the actual dimensions of textures in the Textures namespace aren't necessarily the same as those defined in (say) the TEXTURE1 lump, the real dimensions are only known once the texture image is composite is built.

Looking at the code it would appear we already have some logic which attempts to do this with composites bound for use on the sky dome. However, the logic there is flawed also because the logical dimensions of the texture remain the same and only the dimensions of the uploaded image are adjusted.

See the attached test WAD for a concrete example of the failure case.

Labels: Data