Add frame buffers

frontend/src/scripts/drawing/graphics-library/default-frame-buffer.ts

@@ -0,0 +1,26 @@
+import { FragmentShaderOnlyProgram } from './fragment-shader-only-program';
+import { FrameBuffer } from './frame-buffer';
+
+export class DefaultFrameBuffer extends FrameBuffer {
+  constructor(
+    gl: WebGL2RenderingContext,
+    programs: Array<FragmentShaderOnlyProgram>
+  ) {
+    super(gl, programs);
+    this.frameBuffer = null;
+
+    this.setSize();
+  }
+
+  public setSize() {
+    super.setSize();
+
+    if (
+      this.gl.canvas.width !== this.size.x ||
+      this.gl.canvas.height !== this.size.y
+    ) {
+      this.gl.canvas.width = this.size.x;
+      this.gl.canvas.height = this.size.y;
+    }
+  }
+}