undefined identifier nonuniformEXT compiler error

[theblackunknown]

Hi team,

While porting our GLSL shaders to be compiled with slangc, I am running into a compiler error where nonuniformEXT is unexpected.
It is a feature offered by GL_EXT_nonuniform_qualifier that we are using in our shaders, I should expect Slang to resolve it out of the box, or if I need to tell the Slang compiler that I need this extension for things to resolve correctly ?

See below for a minimal repro case.
If you can point me to how to port it as a Slang test I would gladly contribute it if that helps.

Given the following nonuniformExt.slang file

#version 450 core

layout(location = 0) out mediump vec4 o_color;
layout(location = 0) flat in int i;
layout(set = 0, binding = 0) uniform sampler2D tex[2];

void main()
{
    o_color = texture(tex[nonuniformEXT(i)], vec2(0.25, 0.75));
}

compiling the above file using the following command line
slangc.exe -target spirv -stage fragment -entry main nonuniformExt.slang

Will produce the following errors

tests\glsl\nonuniformExt.slang(9): error 30015: undefined identifier 'nonuniformEXT'.
    o_color = texture(tex[nonuniformEXT(i)], vec2(0.25, 0.75));
                          ^~~~~~~~~~~~~
tests\glsl\nonuniformExt.slang(9): error 30014: index expression must evaluate to int.
    o_color = texture(tex[nonuniformEXT(i)], vec2(0.25, 0.75));

[jkwak-work]

This appears to be a missing feature support for GLSL.
As a workaround, you can have a following line,

#define nonuniformEXT NonUniformResourceIndex

[theblackunknown]

Thanks @jkwak-work, I have applied your suggestion and it seems to work !
Would you be able to point me at few places if I want to contribute to add this feature ?

[jkwak-work]

I have a quick PR for this issue #5695