Overview

Refactors the Gaussian Splat shader system to unify format handling across all resource types, improving code organization and enabling future extensibility.

Changes

Shader chunk reorganization:

• Moved format-specific shader chunks to shader-lib/*/chunks/gsplat/vert/formats/ folder
• Consolidated formats: uncompressed, compressed, SOGS, work buffer, container
• Merged separate declaration/read chunks into single files per format (except container which needs split for user code injection)
• Added gsplatFormatVS chunk for common base declarations (splatTextureSize, splatUV)

Unified resource architecture:

• Moved GSplatFormat and textures Map from GSplatContainer to GSplatResourceBase
• All resource types now define their format with streams and shader includes
• Centralized texture binding and splatTextureSize uniform handling in base class
• Format hash used for shader caching to prevent conflicts between different formats

Simplified GSplatFormat class:

• Removed GLSL/WGSL duplication - now picks appropriate language at construction based on device
• Cleaner API: getDeclarations() and getReadCode() (single methods, not per-language)

Backward Compatibility

• Main gsplat.js shader unchanged
• Public API preserved
• Existing examples work without modification

Renaming

• all SOGS references / names / chunks are now SOG