[next] When starting in OpenGL and switching to Software, entering levels blackens the screen until the renderer is changed.

I've tried recording a GIF, but it turns out that GIFs don't capture this bug..

added Bug Regression Rendering OpenGL renderer Software renderer labels

changed milestone to %2.2.9

This seems to specifically happen on fullscreen mode for me, not on windowed mode.

Bisected the issue. It is introduced by !1257 (merged), although in a more powerful form, where booting into the main menu with opengl and fullscreen and switching to software will immediately result in a black screen. !1264 (merged) then changes the bug into the form it currently is in.

https://git.do.srb2.org/STJr/SRB2/blob/next/src/p_setup.c#L4139

This line appears to be related to the issue, removing it causes the issue to stop happening when testing with the steps I've been using:

1. Start SRB2 in OpenGL mode and fullscreen already enabled
2. Switch to Software mode from the video settings menu, close menus
3. devmode 1 and map 1 in console

Before removing the line, at this point the screen becomes and stays black after fading to black and showing the "Speeding off to level" message.

After removing the line, at this point the level loads normally without the screen staying black.

Of course removing that line is not a solution, since it would likely break things, but I don't have enough knowledge of the internals to suggest any full solutions at this point. I thought that this might be a helpful starting point for others looking into this.

mentioned in merge request !1440 (merged)

closed via merge request !1440 (merged)

mentioned in commit 99c773f3