Strange portal rendering glitch (since maybe 4.8)

[Ichor]

I think someone reported this before, but it went nowhere due to lack of information. Anyway, here are a couple of pictures of a portal. First is from version gzdoom-4-7-1-Windows-64bit:


Second is from gzdoom-x86-g4.8pre-249-g8fe07f144:


I then upgraded to gzdoom-x86-g4.9pre-26-g3213f046c and the problem persists.

[Ichor]

Added a test map.

4.7.1


4.9pre-26

[Graf Zahl]

Looks correct for me, with both 4.8 and current Git head.

[Ichor]

The glitch does show up when I use the hardware accelerated option, but not Doom software renderer or true color sw renderer.

[Chris]

Have you tried switching between OpenGL and Vulkan? What OS and graphics card are you using?

[Blue Shadow]

From my tests (with 4.9pre-26-g3213f046c and OpenGL as the backend), this seems to manifest in the 32-bit build only. The 64-bit build works fine under all render modes.

[Graf Zahl]

In that case, case closed.
32 Bit is not supported anymore.

[Nash]

Where are these 32 bit executables even being downloaded/distributed? The main site clearly only offers a 64 bit download...

[Graf Zahl]

Self-compiled, presumably..

But let's make this clear: 32 bit isn't being tested anymore and no guarantees are given, and any 32 bit specific bug report will be closed on sight.

[Blue Shadow]

People are getting them from here

[Nash]

People are getting them from here :p

Hmm, I wonder if it's better to stop building them. I don't see the point, if the official stance on 32 bit is that it's no longer supported.

[Graf Zahl]

Yes, they should be stopped.

I think I just add a static_assert to make them fail for now.

[Blzut3]

As a reminder if you guys want a change in the build process all you need to do is drop a message my way (or a pull request). I don't read every thread on this forum, but happened to browse this one today.

[Hirogen2]

Data point: Using an -m32 build on a x64 CPU,

Code: Select all

GZDoom 4.8.1 -  - SDL version
...
CPU Vendor ID: GenuineIntel
  Name: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
  Family 6, Model 140, Stepping 1
  Features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 AVX512 F16C FMA3 BMI1 BMI2 HyperThreading
Using video driver x11
GL_VENDOR: Intel
GL_RENDERER: Mesa Intel(R) Xe Graphics (TGL GT2)
GL_VERSION: 4.6 (Core Profile) Mesa 22.1.2 (Core profile)
GL_SHADING_LANGUAGE_VERSION: 4.60

The demo portal map shows no issue for me.

[drfrag]

Most likely it's an old VS 2019 bug (or something changed in the compiler), same thing happened with mirrors and they worked when compiled with VS 2017. No longer relevant of course.