[Init] Initial commit - NetMesh terminal manager

components/terminal/runtime/webglRendererPolicy.ts

@@ -0,0 +1,21 @@
+/**
+ * Decide whether a terminal should postpone creating its WebGL renderer until
+ * the pane is actually visible.
+ *
+ * Every terminal that loads the WebGL addon holds a live WebGL context for its
+ * whole lifetime. Batch-connecting several hosts mounts all their panes at once,
+ * so without deferral the renderer creates N WebGL contexts back-to-back on the
+ * main thread (and N contexts contend for the GPU, which is also the root of the
+ * "garbled / 花屏" corruption in #1049/#1063). A pane that mounts hidden does not
+ * need a renderer yet — it buffers output via xterm's default DOM renderer and
+ * upgrades to WebGL the moment it becomes visible.
+ *
+ * Visible panes (single connect, the active tab of a batch) keep the current
+ * behavior: WebGL is created immediately.
+ */
+export function shouldDeferWebglUntilVisible(opts: {
+  useWebGLAddon: boolean;
+  initiallyVisible: boolean;
+}): boolean {
+  return opts.useWebGLAddon && !opts.initiallyVisible;
+}