Enable or Add shader_framebuffer_fetch extension for dolphin on RPI4 Lakka Aarch64

First and foremost consider this:

• Only RetroArch bugs should be filed here. Not core bugs or game bugs
• This is not a forum or a help section, this is strictly developer oriented

Description

The lakka is amazing on my rpi4 and i can play some gamecube games as well. But i cant play a game "Mario Kart Double Dash" because has a darker screen (Apperar like an BlueMask) in the game. Dolphin emulator has an explanation about it because the devs of this emulator have removed some things on android versions and maybe, the same with core of dolphin in lakka instead for rpi4...

Expected behavior

the core if have "shader_framebuffer_fetch extension" that is commonly supported on GLES devices. and so, the issue is solved

(more explanation there : https://br.dolphin-emu.org/blog/2018/02/03/dolphin-progress-report-january-2018/)

Actual behavior

Actually, the game Mario Kart double dash on rpi4 is dont working well because of this bluemask (dark image) turning impossible to play tracks. If possible, can devs of lakka try to include this shader_framebuffer_fetch extension and this game and others like this can be pleyable...

Steps to reproduce the bug

1. enter in the game cube core (Dolphin) using a rpi4 instead
2. select mario kart double dash game for GC
3. set an map to run ...so, into the map, a dark BlueMask will apear turning impossible to play ...

Bisect Results

Always since have the dolphin core for rpi4 Aarch64 versions of lakka

Environment information

• OS: Lakka for rpi4 Aarch64
• Compiler: nightly builds most actual

Start at the Dolphin core's GLES path on Lakka for RPI4 Aarch64 and compare the reported shader_framebuffer_fetch behavior with the linked Dolphin explanation. Reproduce Mario Kart Double Dash using the listed steps; done means the blue mask and dark rendering are gone on affected tracks.