Wed, Apr 22, 2026

Implement normal mapping and octahedron normal encoding

• Add support for tangent space normal mapping across static and skinned meshes.
• Update vertex layouts and Assimp import flags to calculate and include tangent data.
• Implement octahedron normal encoding for G-buffer optimization, storing geometric normals in the metallic-roughness target and pixel normals in the normal target.
• Refactor material system to use bitmasks for shader settings instead of individual floats, reducing uniform overhead.
• Consolidate skinned mesh and static mesh fragment shaders to use a unified geom-fs.sc.
• Integrate shaderlib.sh for shared decoding/encoding utility functions.
• Add metallicRoughnessCombine sampler to the deferred combination pass to support new normal reconstruction logic.

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