Initial commit

rust/forge-internal-rs/src/lib.rs

@@ -0,0 +1,154 @@
+
+use std::cell::RefCell;
+use js_sys::{Array, ArrayBuffer, Float32Array, Object, Reflect, Uint16Array, Uint32Array, Uint8Array};
+use wasm_bindgen::prelude::*;
+
+use wlg::decode12_packed;
+
+mod sort;
+use sort::{old_sort_internal, OldSortBuffers, sort_internal, SortBuffers};
+
+mod raycast;
+use raycast::{raycast_ellipsoids, raycast_spheres};
+
+const RAYCAST_BUFFER_COUNT: u32 = 65536;
+
+thread_local! {
+    static SORT_BUFFERS: RefCell<SortBuffers> = RefCell::new(SortBuffers::default());
+    static OLD_SORT_BUFFERS: RefCell<OldSortBuffers> = RefCell::new(OldSortBuffers::default());
+    static RAYCAST_BUFFER: RefCell<Vec<u32>> = RefCell::new(vec![0; RAYCAST_BUFFER_COUNT as usize * 4]);
+}
+
+#[wasm_bindgen]
+pub fn decode_wlg(bytes: ArrayBuffer, tex_width: u32, tex_height: u32) -> Object {
+    let mut bytes = Uint8Array::new(&bytes).to_vec();
+    let (_settings, packed_splats) = match decode12_packed(&mut bytes) {
+        Ok(result) => result,
+        Err(err) => {
+            wasm_bindgen::throw_str(&format!("{}", err));
+        }
+    };
+
+    let num_splats = packed_splats.0.len() / 4;
+    let max_splats = if tex_width != 0 && tex_height != 0 {            
+        let width = tex_width as usize;
+        let height = num_splats.div_ceil(width).min(tex_height as usize);
+        let depth = num_splats.div_ceil(width * height);
+        width * height * depth
+    } else {
+        num_splats
+    };
+
+    let packed = Uint32Array::new_with_length(max_splats as u32 * 4);
+    let packed_slice = packed.subarray(0, packed_splats.0.len() as u32);
+    packed_slice.copy_from(&packed_splats.0);
+
+    let result = Object::new();
+    Reflect::set(&result, &JsValue::from_str("numSplats"), &JsValue::from_f64(num_splats as f64)).unwrap();
+    Reflect::set(&result, &JsValue::from_str("packedSplats"), &JsValue::from(packed)).unwrap();
+    result
+}
+
+#[wasm_bindgen]
+pub fn old_sort_splats(
+    max_splats: u32, total_splats: u32, readback: Array, ordering: Uint32Array,
+) -> u32 {
+    let max_splats = max_splats as usize;
+    let total_splats = total_splats as usize;
+    let num_layers = readback.length() as usize;
+    let layer_size = readback.get(0).dyn_into::<Uint8Array>().unwrap().length() as usize / 4;
+
+    let active_splats = OLD_SORT_BUFFERS.with_borrow_mut(|buffers| {
+        buffers.ensure_size(max_splats);
+
+        // Copy the readback data layers into a contiguous buffer
+        let mut layer_base = 0;
+        for layer in 0..num_layers {
+            let layer_count = layer_size.min(total_splats - layer_base);
+            if layer_count > 0 {
+                let layer_buffer = readback.get(layer as u32).dyn_into::<Uint8Array>().unwrap().buffer();
+                let layer_uint32 = Uint32Array::new_with_byte_offset_and_length(&layer_buffer, 0, layer_count as u32);
+                layer_uint32.copy_to(&mut buffers.readback[layer_base..layer_base + layer_count]);
+            }
+            layer_base += layer_count;
+        }
+
+        let active_splats = match old_sort_internal(buffers, total_splats) {
+            Ok(active_splats) => active_splats,
+            Err(err) => {
+                wasm_bindgen::throw_str(&format!("{}", err));
+            }
+        };
+
+        if active_splats > 0 {
+            // Copy out ordering result
+            let subarray = &buffers.ordering[..active_splats as usize];
+            ordering.subarray(0, active_splats).copy_from(&subarray);
+        }
+        active_splats
+    });
+
+    active_splats
+}
+
+#[wasm_bindgen]
+pub fn sort_splats(
+    num_splats: u32, readback: Uint16Array, ordering: Uint32Array,
+) -> u32 {
+    let max_splats = readback.length() as usize;
+
+    let active_splats = SORT_BUFFERS.with_borrow_mut(|buffers| {
+        buffers.ensure_size(max_splats);
+        let sub_readback = readback.subarray(0, num_splats);
+        sub_readback.copy_to(&mut buffers.readback[..num_splats as usize]);
+
+        let active_splats = match sort_internal(buffers, num_splats as usize) {
+            Ok(active_splats) => active_splats,
+            Err(err) => {
+                wasm_bindgen::throw_str(&format!("{}", err));
+            }
+        };
+
+        if active_splats > 0 {
+            // Copy out ordering result
+            let subarray = &buffers.ordering[..active_splats as usize];
+            ordering.subarray(0, active_splats).copy_from(&subarray);
+        }
+        active_splats
+    });
+
+    active_splats
+}
+
+#[wasm_bindgen]
+pub fn raycast_splats(
+    origin_x: f32, origin_y: f32, origin_z: f32,
+    dir_x: f32, dir_y: f32, dir_z: f32,
+    near: f32, far: f32,
+    num_splats: u32, packed_splats: Uint32Array,
+    raycast_ellipsoid: bool,
+) -> Float32Array {
+    let mut distances = Vec::<f32>::new();
+
+    _ = RAYCAST_BUFFER.with_borrow_mut(|buffer| {
+        let mut base = 0;
+        while base < num_splats {
+            let chunk_size = RAYCAST_BUFFER_COUNT.min(num_splats - base);
+            let subarray = packed_splats.subarray(4 * base, 4 * (base + chunk_size));
+            let subbuffer = &mut buffer[0..(4 * chunk_size as usize)];
+            subarray.copy_to(subbuffer);
+
+            if raycast_ellipsoid {
+                raycast_ellipsoids(subbuffer, &mut distances, [origin_x, origin_y, origin_z], [dir_x, dir_y, dir_z], near, far);
+            } else {
+                raycast_spheres(subbuffer, &mut distances, [origin_x, origin_y, origin_z], [dir_x, dir_y, dir_z], near, far);
+            }
+
+            base += chunk_size;
+        }
+    });
+
+    let output = Float32Array::new_with_length(distances.len() as u32);
+    output.copy_from(&distances);
+    output
+}