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apps/color-game.mu

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+# Guess the result of mixing two colors.
+
+fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
+  var second-buffer: screen
+  var second-screen/edi: (addr screen) <- address second-buffer
+  initialize-screen second-screen, 0x80, 0x30, 1/include-pixels
+  var leftx/edx: int <- copy 0x80
+  var rightx/ebx: int <- copy 0x380
+  {
+    compare leftx, rightx
+    break-if->=
+    clear-screen second-screen
+    # interesting value: 9/blue with 0xe/yellow
+    color-field second-screen, leftx 0x40/y, 0x40/width 0x40/height, 1/blue
+    color-field second-screen, rightx 0x41/y, 0x40/width 0x40/height, 2/green
+    copy-pixels second-screen, screen
+    # on the first iteration, give everyone a chance to make their guess
+    {
+      compare leftx, 0x80
+      break-if->
+      var x/eax: byte <- read-key keyboard
+      compare x, 0
+      loop-if-=
+    }
+    leftx <- add 2
+    rightx <- subtract 2
+    loop
+  }
+}
+
+fn color-field screen: (addr screen), xmin: int, ymin: int, width: int, height: int, color: int {
+  var xmax/esi: int <- copy xmin
+  xmax <- add width
+  var ymax/edi: int <- copy ymin
+  ymax <- add height
+  var y/eax: int <- copy ymin
+  {
+    compare y, ymax
+    break-if->=
+    var x/ecx: int <- copy xmin
+    {
+      compare x, xmax
+      break-if->=
+      pixel screen, x, y, color
+      x <- add 2
+      loop
+    }
+    y <- increment
+    compare y, ymax
+    break-if->=
+    var x/ecx: int <- copy xmin
+    x <- increment
+    {
+      compare x, xmax
+      break-if->=
+      pixel screen, x, y, color
+      x <- add 2
+      loop
+    }
+    y <- increment
+    loop
+  }
+}
+
+fn linger {
+  var i/ecx: int <- copy 0
+  {
+    compare i, 0x40000000  # Kartik's Linux with -accel kvm
+#?     compare i, 0x8000000  # Kartik's Mac with -accel tcg
+    break-if->=
+    i <- increment
+    loop
+  }
+}