Godot 4 RC 2 completely gets rid of viewport lines on OpenGL.

[ghost]

Godot version

4.0 RC 2

System information

Windows 11, AMD Radeon RX 6700 XT, OpenGL

Issue description

OpenGL:

Vulkan:

Note:
All I did was switch from forward+ to compatibility at the top right.

Steps to reproduce

1: New project, rendering device = compatibility
2. See the problem?

Minimal reproduction project

rc2test.zip

[clayjohn]

I can't reproduce on my device. PopOS 22.04 intel iGPU.

This is how the MRP looks for me using the gl_compatibility renderer:

I can test on another computer as well to see if maybe this is a Windows or Radeon GPU issue

[clayjohn]

I can reproduce this on Windows 10 with an RX 6900 XT.

This appears to be a regression from #72914. Line drawing relies on unpackHalf2x16 which appears to return a totally wrong color on Radeon GPUs now