Disable closer zoom levels for software rendering

src/openrct2/Context.cpp

@@ -535,6 +535,8 @@ namespace OpenRCT2
                     }
                 }
             }
+
+            window_check_all_valid_zoom();
         }
 
         void DisposeDrawingEngine() final override

src/openrct2/interface/Viewport.cpp

@@ -17,6 +17,7 @@
 #include "../core/Guard.hpp"
 #include "../core/JobPool.hpp"
 #include "../drawing/Drawing.h"
+#include "../drawing/IDrawingEngine.h"
 #include "../paint/Paint.h"
 #include "../peep/Staff.h"
 #include "../ride/Ride.h"
@@ -1926,3 +1927,15 @@ void viewport_set_saved_view()
         gSavedViewRotation = get_current_rotation();
     }
 }
+
+ZoomLevel ZoomLevel::min()
+{
+    if (drawing_engine_get_type() == DRAWING_ENGINE_OPENGL)
+    {
+        return -2;
+    }
+    else
+    {
+        return 0;
+    }
+}

src/openrct2/interface/Window.cpp

@@ -1001,6 +1001,19 @@ void window_viewport_centre_tile_around_cursor(rct_window* w, int16_t map_x, int
                         centreLoc->y + rebased_y + (offset_y / w->viewport->zoom) };
 }
 
+/**
+ * For all windows with viewports, ensure they do not have a zoom level less than the minimum.
+ */
+void window_check_all_valid_zoom()
+{
+    window_visit_each([](rct_window* w) {
+        if (w->viewport != nullptr && w->viewport->zoom < ZoomLevel::min())
+        {
+            window_zoom_set(w, ZoomLevel::min(), false);
+        }
+    });
+}
+
 void window_zoom_set(rct_window* w, ZoomLevel zoomLevel, bool atCursor)
 {
     rct_viewport* v = w->viewport;

src/openrct2/interface/Window.h

@@ -724,6 +724,7 @@ void window_rotate_camera(rct_window* w, int32_t direction);
 void window_viewport_get_map_coords_by_cursor(
     rct_window* w, int16_t* map_x, int16_t* map_y, int16_t* offset_x, int16_t* offset_y);
 void window_viewport_centre_tile_around_cursor(rct_window* w, int16_t map_x, int16_t map_y, int16_t offset_x, int16_t offset_y);
+void window_check_all_valid_zoom();
 void window_zoom_set(rct_window* w, ZoomLevel zoomLevel, bool atCursor);
 void window_zoom_in(rct_window* w, bool atCursor);
 void window_zoom_out(rct_window* w, bool atCursor);

src/openrct2/interface/ZoomLevel.hpp

@@ -136,10 +136,7 @@ public:
             return lhs >> rhs._level;
     }
 
-    static constexpr ZoomLevel min()
-    {
-        return -2;
-    }
+    static ZoomLevel min();
 
     static constexpr ZoomLevel max()
     {