Shader: Photoshop Overlay Effect

1. //Somehow achieves an effect similar to this:
2. //#define BlendOverlayf(base, blend) (base < 0.5 ? (2.0 * base * blend) : (1.0 - 2.0 * (1.0 - base) * (1.0 - blend)))
4. Shader "Photoshop/Overlay"
5. {
6. Properties
7. {
8. _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
9. }
11. SubShader
12. {
13. Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
14. ZWrite Off Lighting Off Cull Off Fog { Mode Off } Blend DstColor SrcColor
15. LOD 110
17. Pass
18. {
19. CGPROGRAM
20. #pragma vertex vert_vct
21. #pragma fragment frag_mult
22. #pragma fragmentoption ARB_precision_hint_fastest
23. #include "UnityCG.cginc"
25. sampler2D _MainTex;
26. float4 _MainTex_ST;
28. struct vin_vct
29. {
30. float4 vertex : POSITION;
31. float4 color : COLOR;
32. float2 texcoord : TEXCOORD0;
33. };
35. struct v2f_vct
36. {
37. float4 vertex : POSITION;
38. fixed4 color : COLOR;
39. half2 texcoord : TEXCOORD0;
40. };
42. v2f_vct vert_vct(vin_vct v)
43. {
44. v2f_vct o;
45. o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
46. o.color = v.color;
47. o.texcoord = v.texcoord;
48. return o;
49. }
51. float4 frag_mult(v2f_vct i) : COLOR
52. {
53. float4 tex = tex2D(_MainTex, i.texcoord);
55. float4 final;
56. final.rgb = i.color.rgb * tex.rgb * 2;
57. final.a = i.color.a * tex.a;
58. return lerp(float4(0.5f,0.5f,0.5f,0.5f), final, final.a);
60. }
62. ENDCG
64. }
67. }
69. }

출처 : http://answers.unity3d.com/questions/384550/shader-photoshop-overlay-effect.html