Export Custom Shader

[fenos]

Hello, from the documentation is not very clear on how to have working exported custom shaders.

Imagine I have this simple shader that allows me to give gradient colors to my skybox:

Shader "GradientSkybox/Circular/Two Color" {
    Properties {
        _InnerColor ("Inner Color", Color) = (0.8, 0.8, 0.8, 0)
        _OuterColor ("Outer Color", Color) = (0.5, 0.5, 0.5, 0)
        [KeywordEnum(None, X, Y)] _Norm ("Normalization", Float) = 0
    }
    SubShader {
        Tags {
            "RenderType" = "Background"
            "Queue" = "Background"
            "PreviewType" = "Skybox"
        }
        Pass {
            ZWrite Off
            Cull Off

            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile _NORM_NONE _NORM_X _NORM_Y

            fixed3 _InnerColor, _OuterColor;

            struct appdata {
                float4 vertex : POSITION;
            };

            struct v2f {
                float4 vertex : SV_POSITION;
            };

            v2f vert (appdata v) {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                return o;
            }

            fixed4 frag (v2f i) : SV_TARGET {
                #if _NORM_X
                    float2 uv = (i.vertex.xy / _ScreenParams.x - _ScreenParams.xy / _ScreenParams.x * 0.5) * 2;
                #elif _NORM_Y
                    float2 uv = (i.vertex.xy / _ScreenParams.y - _ScreenParams.xy / _ScreenParams.y * 0.5) * 2;
                #else
                    float2 uv = (i.vertex.xy / _ScreenParams.xy - 0.5) * 2;
                #endif
                return fixed4(lerp(_InnerColor, _OuterColor, length(uv)), 1);
            }

            ENDCG
        }
    }
    CustomEditor "GradientSkybox.CircularTwoColorGradientSkyboxGUI"
}

How would I write this in Unity/Babylon way to have it working during export?

[MackeyK24]

You would actually have to create a GLSL version of your shader