Type Alias PrepassSpecializeFn 

pub type PrepassSpecializeFn = fn(&mut World, ErasedMaterialPipelineKey, &MeshVertexBufferLayoutRef, &Arc<MaterialProperties>) -> Result<CachedRenderPipelineId, SpecializedMeshPipelineError>;

A type erased function pointer for specializing a material prepass pipeline. The implementation is expected to:

• Look up the appropriate specializer from the world
• Downcast the erased key to the concrete key type
• Call SpecializedMeshPipelines::specialize with the specializer and return the resulting pipeline id