Skip copying out segments and segments_from. Use wasm_points and wasm_ids as is

client/index.js

@@ -212,7 +212,7 @@ async function main() {
         'debug': {
             'red': false,
             'do_prepass': true,
-            'use_wasm': false,
+            'use_wasm': true,
             'limit_from': false,
             'limit_to': false,
             'render_from': 0,

client/speed.js

@@ -1,7 +1,7 @@
 async function init_wasm(state) {
     const results = await WebAssembly.instantiateStreaming(fetch('wasm/lod.wasm'));
     state.wasm.exports = results.instance.exports;
-    state.wasm.exports.memory.grow(1024);
+    state.wasm.exports.memory.grow(4096);
 }
 
 function rdp_find_max(state, zoom, coords_from, start, end) {
@@ -45,6 +45,8 @@ function rdp_find_max(state, zoom, coords_from, start, end) {
 }
 
 function do_lod_wasm(state, context) {
+    state.wasm.exports.total_free();
+
     const clipped_indices = state.wasm.exports.alloc(context.clipped_indices.size * 4); 
     const stroke_coords_from = state.wasm.exports.alloc(state.coords_from.size * 4); 
     const stroke_coords_to = state.wasm.exports.alloc(state.coords_to.size * 4); 
@@ -68,28 +70,15 @@ function do_lod_wasm(state, context) {
     );
 
     // copy result back
-    const wasm_segments = new Uint32Array(state.wasm.exports.memory.buffer, segments, segment_count);
-    const wasm_segments_from = new Uint32Array(state.wasm.exports.memory.buffer, segments_from, context.clipped_indices.size + 1);
     const wasm_points = new Float32Array(state.wasm.exports.memory.buffer, coordinates + state.coordinates.size * 4, segment_count * 2);
     const wasm_ids = new Uint32Array(state.wasm.exports.memory.buffer, coordinates + (state.coordinates.size + segment_count * 2) * 4, segment_count);
-
-    state.segments.data.set(wasm_segments);
-    state.segments.size = segment_count;
     
-    state.segments_from.data.set(wasm_segments_from);
+    context.instance_data_points.data = wasm_points;
-    state.segments_from.size = context.clipped_indices.size + 1;
-
-    tv_ensure(context.instance_data_points, segment_count * 2);
-    tv_ensure(context.instance_data_ids, segment_count);
-
-    context.instance_data_points.data.set(wasm_points);
     context.instance_data_points.size = segment_count * 2;
 
-    context.instance_data_ids.data.set(wasm_ids);
+    context.instance_data_ids.data = wasm_ids;
     context.instance_data_ids.size = segment_count;
 
-    state.wasm.exports.total_free();
-
     return segment_count;
 }