Added checkerboard

rust_experiments/src/lib.rs

@@ -7,24 +7,41 @@ extern crate rlibc;
 #[no_mangle]
 pub extern fn rust_main() {
     clear();
+    checkerboard(vga_buffer::Color::Red);
 
     loop {}
 }
 
 fn clear() {
+    use vga_buffer::*;
 
-    let blank_color = vga_buffer::ColorCode::new(
-        vga_buffer::Color::White,
-        vga_buffer::Color::Black);
-    for i in 0..vga_buffer::BUFFER_WIDTH {
-        for j in 0..vga_buffer::BUFFER_HEIGHT {
-            vga_buffer::write_to_coord(i, j, b' ', blank_color);
+    let blank_color = ColorCode::new( Color::White, Color::Black);
+    for i in 0..BUFFER_WIDTH {
+        for j in 0..BUFFER_HEIGHT {
+            write_to_coord(i, j, b' ', blank_color);
+        }
+    }
+}
+
+fn checkerboard(color: vga_buffer::Color) {
+    use vga_buffer::*;
+
+    let active = ColorCode::new(color, color);
+    let blank = ColorCode::new(Color::White, Color::Black);
+    for i in 0..BUFFER_WIDTH {
+        for j in 0..BUFFER_HEIGHT {
+            if (i + j) % 2 == 0 {
+                write_to_coord(i, j, b' ', active);
+            } else {
+                write_to_coord(i, j, b' ', blank);
+            }
         }
     }
 }
 
 mod vga_buffer {
     #[repr(u8)]
+    #[derive(Clone, Copy)]
     pub enum Color {
         Black      = 0,
         Blue       = 1,