Dynamic lighting flickering

[vaa44]

I noticed this bug. It seems to appear only in the Opengl renderer.
https://youtu.be/suSsk2US4gM

[emile_b]

Which level is that? How do I get to the same position? Thanks.

[vaa44]

Which level is that? How do I get to the same position? Thanks.

Hexen map27 near the entrance to the temple (the beginning of the level)

[emile_b]

Ok I got there but it didn't happen for me. Did you play all the way up to that level and does that happen anywhere else? Or just that position?
What are your PC specs?

[emile_b]

Also I don't understand why it is affected by the decals being rendered.

[vaa44]

Ok I got there but it didn't happen for me. Did you play all the way up to that level and does that happen anywhere else? Or just that position?
What are your PC specs?

In Doom, I did not notice anything similar. In Heretic on E2M2, I noticed as though the opposite effect (i.e. the decals on the walls near the torches removed the flicker). In Hexen, I have seen this more than once. In general, this effect appears near objects with lighting that are very close to the walls, such as a torch in the video.
In LzDoom3.87c and GzDoom 4.5.0, 4.6.0 this bug is not present. In GLES renderer also not.
My PC : Athlon X2 2.7GHz, GTS450 (latest available driver), DDR2 800MHz.

[emile_b]

Ok I got there but it didn't happen for me. Did you play all the way up to that level and does that happen anywhere else? Or just that position?
What are your PC specs?

In Doom, I did not notice anything similar. In Heretic on E2M2, I noticed as though the opposite effect (i.e. the decals on the walls near the torches removed the flicker). In Hexen, I have seen this more than once. In general, this effect appears near objects with lighting that are very close to the walls, such as a torch in the video.
In LzDoom3.87c and GzDoom 4.5.0, 4.6.0 this bug is not present. In GLES renderer also not.
My PC : Athlon X2 2.7GHz, GTS450 (latest available driver), DDR2 800MHz.

Ohh really sorry I was testing GLES, yes I actually DO get the same problem when using OpenGL renderer. I will check it out thanks.

[vaa44]

Ok I got there but it didn't happen for me. Did you play all the way up to that level and does that happen anywhere else? Or just that position?
What are your PC specs?

In Doom, I did not notice anything similar. In Heretic on E2M2, I noticed as though the opposite effect (i.e. the decals on the walls near the torches removed the flicker). In Hexen, I have seen this more than once. In general, this effect appears near objects with lighting that are very close to the walls, such as a torch in the video.
In LzDoom3.87c and GzDoom 4.5.0, 4.6.0 this bug is not present. In GLES renderer also not.
My PC : Athlon X2 2.7GHz, GTS450 (latest available driver), DDR2 800MHz.

Ohh really sorry I was testing GLES, yes I actually DO get the same problem when using OpenGL renderer. I will check it out thanks.

Thank you.
By the way, I managed to reproduce this bug in Doom E1M1 near the lamp.

[emile_b]

Fixed here:
https://github.com/emileb/gzdoom/commit ... 4cc574e983

Thanks for the report, was quite a serious bug.

[vaa44]

Fixed here:
https://github.com/emileb/gzdoom/commit ... 4cc574e983

Thanks for the report, was quite a serious bug.

Thank you so much for the fix!
I wish I dont understand out what to do with this code.