Rename RenderingServer::is_low_end() to RenderingServer::is_using_gl_compatibility()

[Calinou]

This name is more explicit as for what the method actually does.

The original name dates back to Godot 3.1 when GLES2 was added alongside GLES3. There were only 2 rendering methods available in Godot 3.x, but we have 3 now.

Since this method isn't exposed to scripting, this doesn't break compatibility.

[stuartcarnie]

Much clearer – thanks!

[clayjohn]

I don't have a strong preference here, but I question whether is_gl_compatibility() is the name we should go with. The intention of that function is not just to provide a quick access to check if we are using the compatibility renderer. The purpose is to highlight that a certain feature set may not be available. It was created back when we had a GLES2 renderer. And the name was kept because we thought we might have a GLES2 renderer in Godot 4 as well.

[stuartcarnie]

And the name was kept because we thought we might have a GLES2 renderer in Godot 4 as well.

Does that mean the value returns is not binary but perhaps an enumeration? Would there be a reason to change behaviour if the back end was GLES3 vs GLES2?

[clayjohn]

And the name was kept because we thought we might have a GLES2 renderer in Godot 4 as well.

Does that mean the value returns is not binary but perhaps an enumeration? Would there be a reason to change behaviour if the back end was GLES3 vs GLES2?

Not an enumeration, no. But its supposed to encapsulate a defined feature set rather than a particular backend.

I suspect that if this has been treated as a flag for the Compatibility renderer then there will be places where it is used that wouldn't work for a potential GLES2 backend.