Add normal mapping and parallax occlusion mapping for character models

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Extends the WMO normal mapping/POM system to character M2 models with
bone-skinned tangents. Auto-generates normal/height maps from diffuse
textures using luminance→height, Sobel→normals (same algorithm as WMO).

- Expand vertex buffer from M2Vertex (48B) to CharVertexGPU (56B) with
  tangent vec4 computed via Lengyel's method in setupModelBuffers()
- Tangents are bone-transformed and Gram-Schmidt orthogonalized in the
  vertex shader, output as TBN for fragment shader consumption
- Fragment shader gains POM ray marching, normal map blending, and LOD
  crossfade via dFdx/dFdy (identical to WMO shader)
- Descriptor set 1 extended with binding 2 for normal/height sampler
- Settings (enable, strength, POM quality) wired from game_screen.cpp
  to both WMO and character renderers via shared UI controls

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This commit is contained in:

Kelsi 2026-02-23 01:40:23 -08:00

parent 3c31c43ca6

commit 9eeb9ce64d

7 changed files with 420 additions and 40 deletions

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