tolelom ea8af38263 feat(renderer): add BRDF LUT generator and IBL resources
Implements CPU-based BRDF LUT generation using the split-sum IBL
approximation (Hammersley sampling, GGX importance sampling, Smith
geometry with IBL k=a²/2). Wraps the 256×256 Rgba8Unorm LUT in
IblResources for GPU upload via wgpu 28.0 API.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-24 21:19:09 +09:00
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