--- a/src/MacSrc/ShockBitmap.c
+++ b/src/MacSrc/ShockBitmap.c
@@ -42,11 +42,26 @@
 
     SDL_RenderClear(renderer);
 
+#ifndef __ANDROID__
+    // On Android there's exactly one OS-controlled-size surface - no
+    // desktop-style window to resize, move, or toggle fullscreen on.
+    // SDL_SetWindowSize() still "succeeds" there (Android has no
+    // SetWindowSize driver hook, so SDL's generic layer just overwrites its
+    // own cached window->w/h to the requested game resolution, e.g.
+    // 640x480, and synthesizes a resize event from that) - which desyncs
+    // SDL's own notion of the window size from the real, unchanged Android
+    // surface size (e.g. 1600x1200), and that desync is exactly what then
+    // makes both SDL's internal renderer viewport and this engine's own
+    // custom GL viewport (OpenGL.cc's opengl_resize(), driven by that same
+    // now-wrong cached size) shrink to the game's resolution instead of
+    // filling the real surface. Skip the desktop-only calls on Android
+    // entirely, leaving SDL's window-size bookkeeping untouched.
     extern bool fullscreenActive;
     SDL_SetWindowFullscreen(window, fullscreenActive ? SDL_WINDOW_FULLSCREEN_DESKTOP : 0);
 
     SDL_SetWindowSize(window, width, height);
     SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
+#endif
 
     SDL_RenderSetLogicalSize(renderer, width, height);