A hint that specifies which render driver to use.
direct3d |
opengl |
opengles2 |
opengles |
metal |
software |
By default the first one in the list that is available on the current platform is chosen.
The values are case-insensitive.
If the application doesn't pick a specific renderer to use, this variable specifies the name of the preferred renderer. If the preferred renderer can't be initialized, the normal default renderer is used.