Fix crash when window gets minimized (#332). Fixes #275

* Make sure aspect ratio is always valid

* Do not render while window has an invalid size (e.g. window is minimized)

src/main.rs

@@ -352,6 +352,11 @@ fn main2() {
         game.tick(delta);
         game.server.tick(&mut game.renderer, delta);
 
+        // Check if window is valid, it might be minimized
+        if physical_width == 0 || physical_height == 0 {
+            return;
+        }
+
         game.renderer.update_camera(physical_width, physical_height);
         game.server.world.compute_render_list(&mut game.renderer);
         game.chunk_builder.tick(&mut game.server.world, &mut game.renderer, version);
@@ -364,7 +369,6 @@ fn main2() {
         ui_container.tick(&mut game.renderer, delta, width as f64, height as f64);
         game.renderer.tick(&mut game.server.world, delta, width, height, physical_width, physical_height);
 
-
         if fps_cap > 0 && !vsync {
             let frame_time = now.elapsed();
             let sleep_interval = Duration::from_millis(1000 / fps_cap as u64);

src/render/mod.rs

@@ -259,10 +259,13 @@ impl Renderer {
             self.height = height;
             gl::viewport(0, 0, width as i32, height as i32);
 
+            let fovy = cgmath::Rad::from(cgmath::Deg(90.0_f32));
+            let aspect = (width as f32 / height as f32).max(1.0);
+
             self.perspective_matrix = cgmath::Matrix4::from(
                 cgmath::PerspectiveFov {
-                    fovy: cgmath::Rad::from(cgmath::Deg(90f32)),
-                    aspect: (width as f32 / height as f32),
+                    fovy,
+                    aspect,
                     near: 0.1f32,
                     far: 500.0f32,
                 }