In Blur filter on Mac, only Box and Dual Filtering works

[mwdiers]

Operating System

MacOS 10.15 and higher

OBS Studio Version?

27.0 (including Release Candidates)

StreamFX Version

0.11.0a1

Expected Behavior

Change Blur type to Box Linear, Gaussian, or Gaussian Linear. Change size or sub-type. See effect change.

Current Behavior

On macOS 11.4, x64, the only Blur effect that works is the Box and Dual Filtering types. Choosing Gaussian or Gaussian Linear has no effect. Changing controls in either of those modes has no effect. Choosing Box Linear causes a black screen.

Occasionally, choosing Gaussian leaves the Box blur in place. Controls have no effect until Type is changed back to Box.

Steps to Reproduce the Bug

Add blur filter to any scene object, whether video, image, or camera.
Set blur type to anything other than Box.

OBS Studio Log

https://obsproject.com/logs/3cbMsaGhJGJX0eho

OBS Studio Crash Log

No response

Any additional Information we need to know?

This is a standard package install of OBS 27 and StreamFX 0.11a1. This problem has existed in all official macOS releases of StreamFX.

[mwdiers]

Looking at the log, this appears to be an OpenGL issue.

[Xaymar]

This is indeed an OpenGL issue, though I have no idea why. The error log does not present useful information here, so I'll be left debugging something that I can't actually see or know.

[Xaymar]

Confirmed.
I've fixed all code that just threw multiple types together implicitly to do so explicitly, which makes Shaders compile fine on OpenGL on Windows, however it does not fix the entire issue. A part of this issue exists upstream in OBS Studio, but can be worked around - although at a hefty performance cost.

[Xaymar]

Fix submitted upstream: obsproject/obs-studio#4864

In the mean time, I will add an alternative blur type based on kernel textures instead of kernel arrays. This runs worse than arrays would, however it supports a theoretically infinite size of blur - as long as your GPU doesn't die from the number of samples required.

[Xaymar]

This appears to be a bug upstream in OBS Studio!
The bug or problem you reported appears to originate from OBS Studio. Unfortunately, due to past disagreements with the OBS Project team about how the project is run, I have been asked to no longer submit bugs or fixes to OBS Studio or any of its direct projects. I will abide by this agreement, until it is lifted or other means force me to no longer abide by this agreement.