fix depth buffer creation

src/main.cpp

@@ -757,7 +757,7 @@ int main(int argc, char** argv)
     pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
     pfd.iPixelType = PFD_TYPE_RGBA;
     pfd.cColorBits = 32;
-    pfd.cDepthBits = 16;
+    pfd.cDepthBits = 24;
     pfd.iLayerType = PFD_MAIN_PLANE;
 
     hDC = GetDC(hWnd);