[Psy-X] Back buffer must be cleared right after renderer is initialized

[lukelunar]

Describe the bug Weird missing parts of the intro image

To Reproduce Steps to reproduce the behavior:

1. Start game on Linux
2. Intro of the game starts missing parts of the image
3. Problem with the borders too, on the square part of the intro the missing parts but in the sides the game seems like to use the last background of the computer to fill the widescreen
4. I'm using xserver-xorg-video-nouveau driver version 1:1.0.16-1

Expected behavior Works like the windows version, intro image ok, widescreen ok

Screenshots

Environment and game (please complete the following information):

• Game version last REDRIVER2_linux_dev and io.github.opendriver2.Redriver2.flatpak to this date
• Operating System: Linux Mint 20.2
• CPU model [Intel i3]
• GPU model [Nvidia GTS 450]

[lukelunar]

Besides that game works fine, just played take a ride so far.

[VinnyVynce]

Have you tried with the non-free drivers and do you get the same results?