emil28092005 fa937ecd94 feat: cubemap shadow mapping — true omnidirectional point light shadows
- VulkanShadowMap: 1024x1024x6 layer D32_SFLOAT cube image
  - CubeCompatible flag, cube view for sampling, 6 face views for rendering
  - GetFaceViewProj: 6 directions (+X, -X, +Y, -Y, +Z, -Z) with correct up vectors
- 6 shadow render passes per frame (one per cube face)
- Fragment shader: samplerCube instead of sampler2D
  - Shadow: direction from light to fragment, distance comparison
  - No more perspective frustum limitation — omnidirectional shadows
- shadow.vert: same push constant block (160B), uses lightViewProj per face
- triangle.vert: removed fragLightSpacePos (not needed for cubemap)
- Reduced shadow map size to 1024 (6x memory vs single 2048)
- Floor/Grid excluded from shadow casting
2026-06-18 20:35:01 +03:00
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