Summary

Adds GPU-based processing capabilities for Gaussian Splat data and support for custom per-splat texture streams.

Architecture

GSplatProcessor

New class for GPU-based processing of gsplat texture data using fragment shaders. Enables operations like modifying splat properties directly on the GPU.

• Source/Destination binding: Flexible binding system supporting GSplatResource (shared textures) or GSplatComponent (instance textures)
• Shader system: User provides GLSL/WGSL process chunks; processor handles texture binding and render setup
• Blend states: Supports custom blend modes for accumulative operations

Extra Streams

GSplatFormat now supports adding custom texture streams beyond the standard splat data:

resource.format.addExtraStreams([
    { name: 'customColor', format: pc.PIXELFORMAT_RGBA8, storage: pc.GSPLAT_STREAM_INSTANCE }
]);

Stream Storage Types

• GSPLAT_STREAM_RESOURCE - Texture shared across all instances (default)
• GSPLAT_STREAM_INSTANCE - Texture created per component instance

Public API

Classes

• GSplatProcessor - GPU processing of gsplat data
  • constructor(device, source, destination, options)
  • process() - Execute the processing shader
  • setParameter(name, value) - Set shader uniforms
  • blendState - Configure output blending
  • destroy() - Clean up resources

GSplatFormat Methods

• addExtraStreams(descriptors) - Add custom texture streams

Constants

• GSPLAT_STREAM_RESOURCE
• GSPLAT_STREAM_INSTANCE

GSplatComponent Methods

• getInstanceTexture(name) - Get instance-level texture by stream name

Shader API Changes

Renamed gsplat shader functions for consistency:

Example

New gaussian-splatting/paint example demonstrates 3D painting on gsplats using the processor API.
Model supplied by Stéphane Agullo (thank you!) https://superspl.at/view?id=cdcec084