The SDL backend will scale the framebuffer up, by the factor specified in the
`FBSCALE` environment variable. So run the demo as: `FBSCALE=3 ./demo` for
a 3x scale factor, or just export the `FBSCALE` env var in the shell you are
going to use for running the demo. The default scale factor is 2x.
The SDL backend will scale the framebuffer up, by the factor specified in the
`FBSCALE` environment variable. So run the demo as: `FBSCALE=3 ./demo` for
a 3x scale factor, or just export the `FBSCALE` env var in the shell you are
going to use for running the demo. The default scale factor is 2x.