Add files

src/graphics/graphics-library/helper/enable-extension.ts

@@ -0,0 +1,39 @@
+const extensions: Map<string, any> = new Map();
+
+const printExtensions = () => {
+  const values = {};
+  for (const [k, v] of extensions.entries()) {
+    values[k] = v !== null;
+  }
+  //InfoText.modifyRecord('extensions', values);
+};
+
+export const tryEnableExtension = (
+  gl: WebGL2RenderingContext,
+  name: string
+): any | null => {
+  if (extensions.has(name)) {
+    return extensions.get(name);
+  }
+
+  let extension = null;
+  if (gl.getSupportedExtensions()!.indexOf(name) != -1) {
+    extension = gl.getExtension(name);
+  }
+
+  extensions.set(name, extension);
+
+  printExtensions();
+
+  return extension;
+};
+
+export const enableExtension = (gl: WebGL2RenderingContext, name: string): any => {
+  const extension = tryEnableExtension(gl, name);
+
+  if (extension === null) {
+    throw new Error(`Unsupported extension ${name}`);
+  }
+
+  return extension;
+};