zigrtiow: progress indicator.

zigrtiow/src/main.zig

@@ -12,6 +12,8 @@ pub fn main() anyerror!void {
 
     var j: isize = image_height - 1;
     while (j >= 0) : (j -= 1) {
+        info("Scanlines remaining: {d}", .{j});
+
         var i: isize = 0;
         while (i < image_width) : (i += 1) {
             var r = @intToFloat(f32, i) / @intToFloat(f32, image_width - 1);