Pong

Trash

src/main.rs

@@ -13,22 +13,74 @@ fn panic_handler(_info: &PanicInfo) -> ! {
 }
 
 const OUTPUT: *mut u32 = 0x2000_0000 as *mut u32;
-// const BTNS: *mut u8 = 0x2000_0008 as *mut u8;
-
+const BTNS: *mut u8 = 0x2000_0008 as *mut u8;
 const SCREEN: *mut u32 = 0x2000_0080 as *mut u32;
 
 #[entry]
 fn main() -> ! {
-    let mut value: u32 = 1;
-    let mut offset: isize = 0;
+    let mut playerA: u8 = 1;
+    let mut playerB: u8 = 1;
+    let mut ballX: i8 = 16;
+    let mut ballY: i8 = 16;
+    let mut ballXvel: i8 = 1;
+
+    let mut vram: [u32; 32] = [0; 32];
+
+    vram[playerA as usize] |= 1 << 31;
+    vram[playerB as usize] |= 1;
+    vram[ballY as usize] |= 1 << ballX;
+
     loop {
+        let btns;
         unsafe {
-            SCREEN.offset(offset).write_volatile(value);
+            btns = BTNS.read_volatile();
+        }
+
+        // left up
+        if btns & (1 << 7) > 0 {
+            vram[playerA as usize] &= !(1 << 31);
+            playerA -= 1;
+            vram[playerA as usize] |= 1 << 31;
+        }
+        // left down
+        if btns & (1 << 5) > 0 {
+            vram[playerA as usize] &= !(1 << 31);
+            playerA += 1;
+            vram[playerA as usize] |= 1 << 31;
+        }
+
+        // right up
+        if btns & (1 << 3) > 0 {
+            vram[playerB as usize] &= !1;
+            playerB -= 1;
+            vram[playerB as usize] |= 1;
         }
-        value <<= 1;
-        offset += 1;
-        if value == 0 {
-            panic!();
+        // right down
+        if btns & (1 << 1) > 0 {
+            vram[playerB as usize] &= !1;
+            playerB += 1;
+            vram[playerB as usize] |= 1;
+        }
+
+        if ballX >= 31 {
+            ballXvel = -1;
+        } else if ballX == 0 {
+            ballXvel = 1;
+        }
+        vram[ballY as usize] &= !(1 << ballX);
+        ballX += ballXvel;
+        vram[ballY as usize] |= 1 << ballX;
+
+        draw(&vram);
+    }
+}
+
+fn draw(vram: &[u32; 32]) {
+    for row_index in 0..32 {
+        unsafe {
+            SCREEN
+                .offset(row_index)
+                .write_volatile(vram[row_index as usize]);
         }
     }
 }