OpenGL: Point rendering not working

[Calinou]

Godot version

4.0.rc3

System information

Fedora 37, GeForce RTX 4090 (NVIDIA 525.85.05)

Issue description

Enabling Transform > Use Point Size and changing Transform > Point Size in a BaseMaterial3D has no effect when using the Compatibility rendering method, but it works when using Forward+ or Forward Mobile (Vulkan).

themoleman on the Godot Contributors Chat has hinted the following:

Just a FYI there is a bug in the compatability renderer that is preventing the gl_PointSize from being set
I ran apitrace on godot and got the following error:
warning C7050 gl_pointSize might be used before being initialized

Forward+

Point sizes of 1, 6 and 20 are used respectively. The red points on the right use a transparent textured material.

Mobile

Shadow casting appears different due to #73827.

Compatibility

Red sphere is invisible because of the transparent texture that spans the entire sphere, as opposed to individual points.

Steps to reproduce

• Create a MeshInstance3D with a SphereMesh.
• Add a BaseMaterial3D with Transform > Use Point Size enabled, then change Transform > Point Size.
• Notice this has no effect if the editor is currently running with the Compatibility rendering method.

Minimal reproduction project

test_point_rendering.zip

[the-brickster]

Im taking a look into this