Step right on through

- Fix culling for meshes that occupy a significant portion of the screen
  and have their corners occluded but center visible
- We actually just need to generate one more mip level, crunching the
  entire frame down into a single pixel

common/src/backend/java/dev/engine_room/flywheel/backend/engine/indirect/DepthPyramid.java

@@ -116,7 +116,7 @@ public class DepthPyramid {
 	public static int getImageMipLevels(int width, int height) {
 		int result = 1;
 
-		while (width > 2 && height > 2) {
+		while (width > 1 && height > 1) {
 			result++;
 			width >>= 1;
 			height >>= 1;