EnderTheCoder 70f35d8382 render map objects: decode compiled W3DMesh art, skin and draw over terrain ...

Read the buildings and props a map places from its compiled art (the
uncompressed worldbuilder stream + embedded DDS textures):

- ra3.models: BAB asset-stream parser (lazy slices), W3DMesh + D3DHierarchy
  decode, DDS (DXT1/3/5 + uncompressed) decode, per-mesh bone remap and
  bind-pose single-joint skinning, flattened to one world-space triangle soup.
- ra3.map: parse the ObjectsList chunk into (type, x, y, z, angle).
- ra3.terrain: render3d rasterises the scene over the raymarched terrain with
  a z-buffer; gpu_terrain carries the scene for the GPU backends.
- ra3.vulkan: second pipeline + depth attachment, terrain.frag writes
  gl_FragDepth, and a small depth bias keeps ground decals from z-fighting.
- objects.fx shaders (compiled to SPIR-V), embedded like scene/terrain.

Only opaque parts are drawn: FX-light billboards (DefaultW3D.fx / BasicW3D.fx)
and damage-fill shells (BuildingsGenericDamageFill.fx) are skipped, since the
latter paint the wrecked interior (e.g. orange CBBuilding_Wood) over the shell.

Ground-decal meshes with no diffuse role and the Road templates themselves are
still not drawn.

2026-09-29 18:08:11 +08:00

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