lostcoast

Trying to rebuild the Half-Life 2 / Source 1 look in Rust on Vulkan. Mostly to learn how the old radiosity bake + RNM thing works.

what works

• vulkan instance, device, swapchain on macOS via MoltenVK
• clear color, present
• hello triangle, push constants, dynamic rendering
• textured cube, vertex / index / uniform buffers, depth, fly camera (WASD + mouse)

what doesn't yet

• glTF loader, scene graph, MSAA
• real time directional light, half-Lambert, normal mapping
• offline lightbaker (direct only)
• full radiosity bake with multi bounce indirect
• RNM lightmaps (3 textures composed by the bump normal in the shader)
• ambient cube probes for dynamic models
• HDR pipeline (fp16, compute autoexposure histogram, bloom, linear tonemap)
• env cubemaps with parallax correction
• dynamic point and spot lights, Phong + Fresnel, PCF shadow maps

run

cargo run --bin app -- --scene assets/scenes/cube.json

WASD to move, mouse to look, click to grab, escape to release.

scope

The math is the Mitchell, McTaggart, Green 2006 SIGGRAPH course notes. It will not match a HL2 screenshot exactly because the look also depends on Valve's content tuning (VRAD parameters, artist authored materials, exposure curves) which I'm not trying to reproduce.

Also not doing: BSP, MDL, VTF, VMT parsing. glTF + a small JSON sidecar for lightmap params, lights, env probes.

license

MIT or Apache 2.0.