Implement Vertical Scrolling

src/rendering/line_rendering.rs

@@ -25,28 +25,33 @@ pub fn draw_pixels(cpu: &mut CPU, game_diplay: &mut Image, palette: &[Color; 4])
     let scy = cpu.get_lcd_scy();
     let line: u8 = cpu.get_lcd_y_coordinate();
 
-    for xtile in 0..20 {
+    let mut display_x: u32 = 0;
+    let mut line_x_pos = scx as u32 % 8;
+
+    for xtile in 0..21 {
         let tile_index = cpu.get_vram_tile_map(
             high_map,
             (((line + scy) / 8) as u16 % 0x100) * 32 + (xtile + (scx as u16 / 8)) % 32,
         );
         let line_data =
             cpu.get_vram_tile_line(high_addressing, tile_index as u16, (line + scy) % 8);
 
-        for x_pixel in 0..8 {
-            //log::info!("Drawing pixel at x: {}, y: {}, xtile: {}, line: {}, color: {}", xtile as u32 * 8 + x_pixel, line as u32, xtile, line, line_data[x_pixel as usize]);
-
-            let width = game_diplay.width();
-            let x = xtile as u32 * 8 + x_pixel;
-            let y = line as u32;
-            let image_len = game_diplay.get_image_data().len();
+        for x_pixel in (line_x_pos % 8)..8 {
+            if display_x >= game_diplay.width() as u32 {
+                break;
+            }
 
-            if (y * width as u32 + x) as usize >= image_len {
-                log::warn!("Pixel out of bounds: x: {}, y: {}", x, y);
+            if (line as usize * game_diplay.width() + display_x as usize)
+                >= game_diplay.get_image_data().len()
+            {
+                log::warn!("Pixel out of bounds: x: {}, y: {}", display_x, line);
                 continue;
             }
 
-            game_diplay.set_pixel(x, y, palette[line_data[x_pixel as usize] as usize]);
+            game_diplay.set_pixel(display_x, line as u32, palette[line_data[x_pixel as usize] as usize]);
+
+            display_x += 1;
+            line_x_pos += 1;
         }
     }
 }