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use glam::Vec3; use std::collections::hash_map::DefaultHasher; use std::hash::{Hash, Hasher}; use std::{mem, slice}; #[derive(Clone, Debug)] pub struct PolygonSoup { pub vertex_positions: Vec<Vec3>, pub index: PolygonSoupIndex, } #[derive(Clone, Debug)] pub enum PolygonSoupIndex { None, Indexed16(Vec<u16>), Indexed32(Vec<u32>), } impl Hash for PolygonSoup { fn hash<H: Hasher>( &self, state: &mut H, ) { fn as_raw_bytes<T>(value: &T) -> &[u8] { let p: *const T = value; let p: *const u8 = p as *const u8; unsafe { slice::from_raw_parts(p, mem::size_of::<T>()) } } for vertex in self.vertex_positions.iter() { let vertex_data = as_raw_bytes(vertex); vertex_data.hash(state); } match &self.index { PolygonSoupIndex::None => {} PolygonSoupIndex::Indexed16(indices) => indices.hash(state), PolygonSoupIndex::Indexed32(indices) => indices.hash(state), } } } impl PolygonSoup { pub fn calculate_hash(&self) -> u64 { let mut hash = DefaultHasher::new(); self.hash(&mut hash); hash.finish() } }