Tick agnes before drawing each screen, but no faster.

apps/agnes/src/main.zig

@@ -75,6 +75,11 @@ fn submain() !void {
     agnes.agnes_set_input(ag, &ag_input, 0);
 
     while(true) {
+        checkKeys();
+        var new_frame:bool = false;
+        _ = agnes.agnes_tick(ag, &new_frame);
+
+        if (new_frame) {
             if (!agnes.agnes_next_frame(ag)) {
                 try console.print("Next frame failed!\n", .{});
                 try console.flush();
@@ -90,10 +95,9 @@ fn submain() !void {
                 }
             }
 
-        checkKeys();
-
             uvm.render(@ptrCast(&gfxFramebuffer), WIDTH * HEIGHT * 4);
         }
+    }
 }
 
 export fn main() void {