HLSL to Cg

I am trying to convert an small hlsl shader to Cg and use it in Unity, any help would be appreciated:

Code (CSharp):

1.  
2. texture m_MyTexture;
3. float m_XCenter;
4. float m_YCenter;
5.  
6. sampler2D samplerState = sampler_state
7.  {
8. Texture = ;
9. MinFilter = Point;
10. MagFilter = Point;
11. MipFilter = Linear;
12. AddressU = CLAMP;
13. AddressV = CLAMP;
14. };
15.  
16. struct VS_OUTPUT
17. {
18. float4 Position : POSITION;
19. float2 TexCoords : TEXCOORD0;
20. };
21.  
22. float4 multiply (VS_OUTPUT Input) : COLOR0
23. {
24.  
25. float4 colour = tex2D(samplerState, Input.TexCoords);
26.  
27. return colour;
28. }
29.  
30. technique Main
31. {
32. pass P0
33. {
34. PixelShader = compile ps_2_0 multiply();
35. }
36. }

PS: If input isn't possible to happen, it's not a problem, it's mainly so I can give it a go at converting it

 

Should that shader actually do something special..?

You can download builtin shader sources from there to see examples:
http://unity3d.com/get-unity/download/archive

 

No, I want to see the differences though in the construction

 

any help?

 

ok i managed to fix it by swapping the sampler part with the normal Properties

 

Could any body know how we do adjust for contrast or hue using CG ? thx for any help