nx_depth_tri.nx

nx_depth_tri.nx -- Z-BUFFERED triangle rasterizer: the primitive that turns a flat textured quad into a real 3D scene. Barycentric depth interpolation (SAME DDA math as UV), a per-fragment DEPTH TEST against a z-buffer, so overlapping triangles resolve OCCLUSION order-independently -- the gateway from 2D blit to 3D (procgen worlds + beings render with correct visibility). Pure integer, deterministic. license_tier: ORIGINAL zbuf: i64 per pixel, SMALLER z == NEARER (init to a large "far" sentinel via depth_clear). depth_on=1 => depth-tested (order-independent). depth_on=0 => painter's (last-writer-wins) = neg-control. z0/z1/z2 = per-vertex depth (any fixed-point scale); interpolated barycentrically like UV.