diff -r 0b96fe6d6b5e -r 823c03733e42 src/context.c
--- a/src/context.c	Sun Aug 11 15:43:01 2024 +0200
+++ b/src/context.c	Sun Aug 11 16:11:30 2024 +0200
@@ -118,13 +118,11 @@
 }
 
 static void asc_event_window_resized(Uint32 id, Sint32 width, Sint32 height) {
-    for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {
-        if (asc_context.windows[i].id == id) {
-            asc_vec2i dimensions = (asc_vec2i) {width, height};
-            asc_context.windows[i].resized = true;
-            asc_context.windows[i].dimensions = dimensions;
-            return;
-        }
+    unsigned int i = asc_window_index(id);
+    if (i < ASC_MAX_WINDOWS) {
+        asc_vec2i dimensions = (asc_vec2i) {width, height};
+        asc_context.windows[i].resized = true;
+        asc_context.windows[i].dimensions = dimensions;
     }
 }
 
@@ -141,12 +139,19 @@
                 asc_set_flag(asc_context.flags, ASC_FLAG_QUIT);
                 break;
             case SDL_WINDOWEVENT: {
-                if (event.window.event == SDL_WINDOWEVENT_RESIZED)
+                if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
                     asc_event_window_resized(
                             event.window.windowID,
                             event.window.data1,
                             event.window.data2
                     );
+                } else if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED) {
+                    unsigned int idx = asc_window_index(event.window.windowID);
+                    asc_context.windows[idx].focused = true;
+                } else if (event.window.event == SDL_WINDOWEVENT_FOCUS_LOST) {
+                    unsigned int idx = asc_window_index(event.window.windowID);
+                    asc_context.windows[idx].focused = false;
+                }
                 break;
             }
             case SDL_MOUSEMOTION: {
@@ -156,6 +161,9 @@
                 // update absolute position
                 asc_context.input.mouse_x = event.motion.x;
                 asc_context.input.mouse_y = event.motion.y;
+                // update which window the mouse was seen in
+                asc_context.input.mouse_window =
+                        asc_window_index(event.motion.windowID);
                 break;
             }
             case SDL_KEYDOWN: