Describe the bug
Weird artifacts on most particles when playing with Complementary Reimagined, giving them a blurry look. Started occurring as soon as rain came down. Ranges from rain drops and fire to hurt particles.
Does not revert back unless restarting the game with shaders disabled or with a clear weather.

Not game breaking, but this makes it rather distracting, especially in the Nether.

To Reproduce
Steps to reproduce the behavior:

1. Install basic rendering mods (Fabric API, Sodium, Iris Shaders) in their latest versions
2. Enable Complementary Reimagined and set it to any performance profile
3. Place down a torch, campfire or any particle emitting block
4. Set the weather property to rain

latest.log, debug.log or crash report if the other 2 arent possible
latest.log

Expected behavior
Particles stay unchanged, with clean and sharp pixelated edges.

Screenshots

Mod and Minecraft version:

• Version: 1.21.1

Mods:

• Fabric API 0.115.4
• Sodium 0.6.9
• Iris Shaders 1.8.8

Shader: Complementary Shaders - Reimagined r5.4

Additional context
When the instance is running for a long time, the log usually gets flooded with render thread warnings such as this one :

[Render thread/WARN]:Shader position_tex_blur_vertical could not find uniform named ColorModulator in the specified shader program.
[Render thread/WARN]:Shader position_tex_blur_horizontal could not find uniform named ColorModulator in the specified shader program.

On an additional note, other player's GUI window appears bugged as well, getting truncated in an elliptic pattern. Unfortunately, I didn't get the opportunity to make a screenshot for this one.

The bug persists on 1.2.6. It is not advised to upgrade after 1.1.3 if playing on 1.21.1

Tried to reproduce with this setup with rain and placing particle blocks, and having my dynamic render open etc, but couldn't.

fabricloader 0.16.10
- iris 1.8.8+mc1.21.1
- java 21
- minecraft 1.21.1
- sodium 0.6.13+mc1.21.1
- watut 1.21.0-1.2.3

Using shaderpack: ComplementaryReimagined_r5.4.zip
Hardware information:
CPU: 20x 13th Gen Intel(R) Core(TM) i5-13600K
GPU: NVIDIA GeForce RTX 5070 Ti/PCIe/SSE2 (Supports OpenGL 3.2.0 NVIDIA 572.83)
OS: Windows 10 (10.0)

Also noticed you are using a Mac, I'm surprised it runs modern minecraft at all I thought apple dropped opengl support, but my info might be dated. I suspect it might be Mac related, they've been known to have weird compatibility issues.

If anyone else is able to reproduce this on a non Mac I might be able to dig into it further, but without access to a Mac myself, I probably can't do anything about this for now. Looks related to blending, something about the state isn't being setup right.

If you want to use latest watut versions for its other new features but avoid your issue, this MIGHT work, it deactivates a decent amount of the new rendering stuff but I'm not sure if it will solve it fully for you:

open config/watut-server.toml
set dynamicGuiUseOldSimpleGUIVisual to true

Thank you for your answer, and as you mentioned, I probably should have disclosed my hardware information.

I tried changing the setting as you told, but unfortunately the issue seems to lie elsewhere. I agree that, although there's not that much compatibility issues nowadays, playing on a Mac is a hassle thanks to their OS-level key binds and will migrate asap.