Why is my shader considered "fixed function" ?

Unity Engine
1

I have a simple GLSL shader that I want to use on a SpriteRenderer. However, Unity tells me that “Material uses fixed function shader. It is not compatible with SpriteRenderer.”

Indeed, when I click on the shader, the Inspector says:
Vertex Shader SM2.0
Fragment Shader Fixed Function

I don’t get why my shader is considered fixed function though. It defines a custom vertex and fragment shader, so there’s nothing FF about it afaict. What am I missing?

Thanks!

Here’s the shader code for reference:

Shader "Custom/CircleShader" {
	Properties {
		_Radius ("Radius",Float) = 1
		_Center ("Center",Vector) = (0.0,0.0,0.0,1.0)
		_MainTex ("Base (RGB)", 2D) = "white" {}
	}
	SubShader {
		//Tags { "Queue" = "Transparent+1" }
		Pass {
			Blend SrcAlpha OneMinusSrcAlpha
			ZWrite Off
			GLSLPROGRAM
			
			#include "UnityCG.glslinc"
			
			uniform float _Radius;
			uniform vec4 _Center;
			varying vec4 world_pos;
			
			#ifdef VERTEX
				void main()
				{
					world_pos = _Object2World * gl_Vertex;
					gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
				}
			#endif
			
			#ifdef FRAGMENT
				void main()
				{
					vec2 p = vec2( world_pos.x, world_pos.y );
					vec2 c = vec2( _Center.x, _Center.y );
					if( distance(p,c) <= _Radius )
						gl_FragColor = vec4(1.0,0.0,0.0,1.0);
					else
						gl_FragColor = vec4(0.0,1.0,0.0,0.0);
				}
			#endif
			
			ENDGLSL
		}
	}
	FallBack "Diffuse"
}
2

Post a bug, it’s probably a parsing issue. All I can suggest at this point is to convert it to cg, which should be just as fast.

3

thanks