textureType_t

The textureType_t enum is part of the idImage class. It designates a texture as 2-dimensional, 3-dimensional, or cubic. It  can be found in .tga file headers extracted from Doom Eternal .resources files. 

Definition

enum textureType_t
{
    TT_2D = 0x0,
    TT_3D = 0x1,
    TT_CUBIC = 0x2,
};