The simplest shader

Some one can tell me why the Simplest Vertex and Fragment program con the CG Tutorial doesn't work with Unity ?

I keep getting errors like:

- Undefined channel 'POSITION'
- 'POSITION' is not visible in the profile
- etc.

The shader i'm trying is:

Code (csharp):

1. Shader "New Shader" {
2.     Properties {
3.         _Color ("Main Color", Color) = (1,1,1,0.5)
4.         _MainTex ("Base (RGB)", 2D) = "white" {}
5.     }
6.     SubShader {
7.         Pass {
8.         CGPROGRAM
9.         // profiles arbfp1
10.         // vertex vert
11.         // fragment frag
12.        
13.         struct VOut {
14.             float4 position : POSITION;
15.             float4 color : COLOR;
16.         };
17.        
18.         struct FOut {
19.             float4 color : COLOR;
20.         };
21.        
22.         VOut vert (float2 position : POSITION)
23.         {
24.             VOut output;
25.            
26.             output.position = float4 (position, 0, 1);
27.             output.color = float4 (0, 1, 0, 1);
28.            
29.             return output;
30.         }
31.        
32.         FOut frag (float4 color : COLOR)
33.         {
34.             FOut output;
35.            
36.             output.color = color;
37.            
38.             return output;
39.         }
40.        
41.         ENDCG      
42.         }
43.     }
44. }

Thanks in advance, i will check for it tomorrow morning.

Omar Rojo

 

On quick scan, one problem is that it's missing:

Code (csharp):

1. #include "UnityCG.cginc"

before the struct VOut { line. There could be more problems, but hopefully this helps. Might want to start with the tutorials in the ShaderLab documentation instead/also.

-Jon

 

I should depend on the UnityCG library ? I don't wan't to, that is why i omitted, and i have already read an re-read the ShaderLab documentation.

I want my shaders to be 100% mine. I'll check it though.

Omar Rojo

 

Is a Unity limitation not to specify semantics for the vertex program's input ? because, according to the book, there should be semantics in CG.

I have already show the sphere with the shader without using UnityCG.cginc

Thanks both, im learning so much , expect to hear more from me

Omar Rojo

 

Yes Aras, I understand perfectly, and i can assume how it can automagically pass the data too (based on the data types and the order of the parameters can be a type), as long as it's logical.

It's just i want to learn CG as it should be according to the book, but i understand perfectly what you mean.

Omar Rojo