Shader Error: Invalid input semantic 'POSITION'

Hello all,

I am currently writing a basic vertex/fragment shader in Unity and for some reason the shader compiler is throwing this error at me:

Supposedly this is because I have a variable inside my v2f struct that has the SV_POSITION semantic - yet, many of the examples that I have seen do this and it works fine. Does anyone have any pointers as to how I can fix this? Here is my code (I hate to straight up dump what I have, but I have no idea what random thing may be causing this problem):

Code (CSharp):

1. Shader "Blink/Blink Controller" {
2.     SubShader {      
3.         Tags { "RenderType"="Transparent" "Queue"="Geometry"}
4.         // PASS 1: Write to stencil buffer, frontface culling.
5.         // Handled in CommandBuffer before Geometry Pass
6.         Pass {
7.             Cull Front
8.             ZWrite Off
9.             Stencil {
10.                 Ref 1
11.                 Comp Always
12.                 Pass Replace
13.             }
14.  
15.             CGPROGRAM
16.             #pragma vertex vert
17.             #pragma fragment frag
18.             struct appdata {
19.                 float4 vertex : SV_POSITION;
20.             };
21.             struct v2f {
22.                 float4 pos : SV_POSITION;
23.             };
24.             v2f vert(appdata v) {
25.                 v2f o;
26.                 o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
27.                 return o;
28.             }
29.             half4 frag(v2f i) : SV_Target {
30.                 return half4(1,0,0,1);
31.             }
32.             ENDCG
33.         }
34.  
35.         // PASS 2: Draw Border
36.         // Handled In Command Buffer before Transparency Pass
37.         Pass {
38.             Cull Off
39.             ZWrite Off
40.             Blend SrcAlpha OneMinusSrcAlpha
41.             Stencil {
42.                 Comp Always
43.                 Pass Keep
44.             }
45.             CGPROGRAM
46.             #pragma vertex vert
47.             #pragma fragment frag
48.             #pragma target 3.0
49.  
50.             #include "UnityCG.cginc"
51.  
52.             struct v2f {
53.                 float4 pos : SV_POSITION;
54.                 float4 projPos : TEXCOORD0;
55.             };
56.  
57.             // Camera's depth texture
58.             uniform sampler2D _CameraDepthTexture;
59.             half4 _Color;
60.             float _Fade;
61.  
62.             v2f vert(appdata_base v) {
63.                 v2f o;
64.                 o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
65.                 o.projPos = ComputeScreenPos(o.pos);
66.                 return o;
67.             }
68.  
69.             fixed4 frag(v2f i) : SV_Target  {
70.                 float2 wcoord = i.projPos.xy / i.projPos.w;
71.                 float depth = LinearEyeDepth(UNITY_SAMPLE_DEPTH(tex2D(_CameraDepthTexture, wcoord)));
72.                 float border = 1.0f - saturate((depth - i.pos.z) * _Fade);
73.                 return fixed4(_Color.rgb, border);
74.             }
75.             ENDCG
76.         }
77.     }
78.     FallBack "Diffuse"
79. }
80.  

 

Hi Guilllaume,

I tried this and got the same error. This is not entirely unexpected as the compiler complains about line 53, which is inside the second pass. Any other ideas? Thank you so much.

 

Update: It seems that this error only appears when I click the "compile and show source" button when viewing the shader in the inspector. At first, I thought this was because the shader wasn't compiling until i clicked said button. However, it seems that this is simply a Unity bug as my shader works fine.

 

Sorry to bump an old thread, but I'm having the exact same problem, except the error originates from inside unity's standard includes. When creating a windows build locally, the error is reported but the build still works. In cloud build however this error aborts the build.

In the shader inspector I can disable d3d9 variants to suppress the error but UCB doesnt seem to respect this.

(The same occurs on 5.6.0f1 which is what the project is actually created in)

full build log for UT folks:

https://developer.cloud.unity3d.com.../default-windows-desktop-64-bit/builds/4/log/

Would appreciate some help here. We would really like to use cloud build.

 

Having absolutely same issue. There are also some more shader errors popping up (after upgrade to Unity 5.5.1), but all the shaders in local build work fine. It only prevents cloud build.

#pragma target 3.5 - eliminates errors, but isn't the best solution, because it also eliminates many older devices...

 

Go to Build Setting -> Player Setting... and under Resolution and Presentation set D3D9 Fullscreen Mode to Exclusive Mode.

That fixed this issue for me with in Unity 2017.2.0f3