TODO

Important Features

Camera paths (splines?)
Animations (and "native" wireframe model support (only edges, not faces; maybe even 2d))
Particle systems
Affine texture mapping (cf. fatmap.txt)
Subpixel-accuracy (cf. fatmap2.txt)

Fix ordering table (Seriously, the drawing order is broken for non-trivial .obj files)
Proper near-plane clipping
Use division LUTs for triangle-filling (integers) and for perspective divides (fixed point)
Broadphase with bounding spheres for model-instances (and option for models with fewer faces which get activated if their distance to the camera is large).
use sin_lut instead of fxSin for better accuracy maybe.
Option for pre-sorted geometry (in case the camera moves only backward/forwards etc. it would be more efficient).
Option to calculate the actual centroid of a face for sorting
Better handling of lookAt singularity (looking completely down/up)

Change model-instance draw options to be properties of the model-instances themselves (so we can have different draw styles for different model-instances and don't have to draw all instances the same)
Fix broken performance measurement (calculate proper averages etc.)
Fix ugly rasterisation bugs
Faster triangle filling (refer to fatmap.txt)
Basic .obj support
Simplify perspective calculations
Don't recalculate vertex projections for each face!
Alternative to naive polygon sorting (ordering table)
Mode switching
Backface culling winding order/normal problem
Key chording/sequences for scene switching
Handle .obj colours (.mtl) on import
Integration of 'apex audio system' for .mod support
Put models into ROM (const)