Made window render below sprites

src/gpu/states.rs

@@ -108,7 +108,7 @@ impl GameBoy {
         // "https://gbdev.io/pandocs/Scrolling.html#mid-frame-behavior"
 
         // And we get the background fifo and the sprite fifo
-        let background_fifo = match self.bus[LCDC].get_bit(0) {
+        let mut background_fifo = match self.bus[LCDC].get_bit(0) {
             false => Line::new_blank(), // When LCDC.0 is 0, the background tile is white
             true => self.get_line_from_coordinates(
                 self.gpu.x.wrapping_add(self.bus[SCX]),
@@ -119,6 +119,16 @@ impl GameBoy {
 
         let mut sprite = self.get_sprite_fifo(self.gpu.x, self.gpu.y, &sprite_height);
 
+        // Window rendering
+        // `- 7` because WX is always 7 more then the actual value
+        let window_x = self.gpu.x as i32 - (self.bus[WX] as i32 - 7);
+        let window_y = self.gpu.window_ly as i32 - self.bus[WY] as i32;
+
+        // Window doesn't scroll so we don't wrap around like with the background
+        if window_x >= 0 && window_y >= 0 && self.can_render_window() {
+            background_fifo = self.get_line_from_coordinates(window_x as u8, window_y as u8, true);
+        }
+
         if let Some((sprite_fifo, sprite_data)) = &mut sprite {
             if self.gpu.rendered_sprites_on_line < 10 {
                 self.apply_palette_to_sprite(sprite_fifo, &sprite_data.palette);
@@ -133,17 +143,6 @@ impl GameBoy {
             self.draw_line(&background_fifo, self.gpu.x as usize, self.gpu.y as usize);
         }
 
-        // Window rendering
-        // `- 7` because WX is always 7 more then the actual value
-        let window_x = self.gpu.x as i32 - (self.bus[WX] as i32 - 7);
-        let window_y = self.gpu.window_ly as i32 - self.bus[WY] as i32;
-
-        // Window doesn't scroll so we don't wrap around like with the background
-        if window_x >= 0 && window_y >= 0 && self.can_render_window() {
-            let window_fifo = self.get_line_from_coordinates(window_x as u8, window_y as u8, true);
-            self.draw_line(&window_fifo, self.gpu.x as usize, self.gpu.y as usize);
-        }
-
         self.gpu.x += 8;
 
         if self.gpu.x == (DISPLAY_SIZE_X as u8) {