This is a demo to show the impact of EXT_framebuffer_multisample_blit_scaled.

As demo, the same image of Super Mario Galaxy is rendered by dolphin-emu ( https://dolphin-emu.org )
with different internal resolutions and blitted on my screen (1600x900). There are two ways to rescale
the sampled framebuffer. The first one "resolved_blit" blits into a temporary frame buffer with the
same resolution as the internal one and blits afterwards to screen with LINEAR as filter.
The second one "scaled_blit" uses the new filter SCALED_RESOLVE_NICEST_EXT and blit to screen directly.

There are 4 runs of different internal resolutions starting from the native 640x528 up to 2560x2112.
So the native one tests heavy upscaling, 2xIR tests light upscaling, 3xIR light downscaling and 4xIR
heavy downscaling. 2.5xIR isn't in the list as this test doesn't make sense without scaling at all.

The complete test was done using mesa git-84f367e and a hd4000 gpu.