i965: Improved support for the ETC/EAC formats on Intel Gen 7 and previous GPUs

This post is about a recent contribution I’ve done to the i965 mesa driver to improve the emulation of the ETC/EAC texture formats on the Intel Gen 7 and older GPUs, as part of my work for the Igalia‘s graphics team.

Demo:

The video mostly shows the behavior of some GL calls and operations with and without the patches that improve the emulation of the ETC/EAC formats on Gen7 GPUs. The same programs run first with the previous ETC/EAC emulation (upper terminal) and then with the new one (lower terminal).

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