WIP

src/utils/graphics/cached-buffer-write.ts

@@ -0,0 +1,36 @@
+export interface CachedFloat32BufferWrite {
+  hasValue: boolean;
+  previous: Float32Array;
+}
+
+export const createCachedFloat32BufferWrite = (
+  length: number
+): CachedFloat32BufferWrite => ({
+  hasValue: false,
+  previous: new Float32Array(length),
+});
+
+export const writeFloat32BufferIfChanged = (
+  device: GPUDevice,
+  buffer: GPUBuffer,
+  values: Float32Array,
+  cache: CachedFloat32BufferWrite
+): boolean => {
+  if (values.length !== cache.previous.length) {
+    throw new Error('Cached buffer write length mismatch');
+  }
+
+  let hasChanged = !cache.hasValue;
+  for (let i = 0; i < values.length && !hasChanged; i++) {
+    hasChanged = !Object.is(values[i], cache.previous[i]);
+  }
+
+  if (!hasChanged) {
+    return false;
+  }
+
+  cache.previous.set(values);
+  cache.hasValue = true;
+  device.queue.writeBuffer(buffer, 0, values);
+  return true;
+};