NGUI 可裁剪的灰度Shader

 1 Shader "Custom/Unlit - Transparent Colored Grayed (SoftClip)" 

 2 {

 3     Properties 

 4     {

 5         _MainTex ("Base (RGB)", 2D) = "white" {}

 6     }

 7     

 8     SubShader {

 9         LOD 200

10         

11         Tags

12         {

13             "Queue" = "Transparent"

14             "IgnoreProjector" = "True"

15             "RenderType" = "Transparent"

16         }

17         

18         pass

19         {

20             Cull Off

21             Lighting Off

22             ZWrite Off

23             

24             Offset -1, -1

25             Fog 

26             { 

27                 Mode Off 

28             }

29             ColorMask RGB

30             AlphaTest Greater .01

31             Blend SrcAlpha OneMinusSrcAlpha

32             ColorMaterial AmbientAndDiffuse

33             

34             CGPROGRAM

35             #pragma vertex vert

36             #pragma fragment frag

37             #include "UnityCG.cginc"

38             

39             sampler2D _MainTex;

40             float4 _MainTex_ST;

41             float2 _ClipSharpness = float2(20.0, 20.0);

42             

43             struct v2f

44             {

45                 float4 vertex : POSITION;

46                 float4  pos : SV_POSITION;

47                 float2  uv : TEXCOORD0;

48                 float2 worldPos : TEXCOORD1;

49             };

50             

51             v2f vert (appdata_base v)

52             {

53                 v2f o;

54                 o.pos = mul (UNITY_MATRIX_MVP, v.vertex);

55                 o.uv = v.texcoord;

56                 o.worldPos = TRANSFORM_TEX(v.vertex.xy, _MainTex);

57                 return o;

58             };

59             

60             half4 frag (v2f i) : COLOR

61             {

62                 float2 factor = (float2(1.0, 1.0) - abs(i.worldPos)) * _ClipSharpness;

63                 half4 texcol = tex2D (_MainTex, i.uv);

64                 texcol.rgb = (texcol.r + texcol.g + texcol.b) / 3;

65                 texcol.a *= clamp( min(factor.x, factor.y), 0.0, 1.0);

66                 return texcol;

67             };

68             ENDCG

69         }

70     } 

71     FallBack "Diffuse"

72 }