U3D无锯齿遮罩shader-可用于ugui
发表于2018-05-15
本篇文章分析的教程是shader实现的无锯齿遮罩，还可以套用到ugui上，具体的实现代码如下：
1、环境
unity: 5.6~2017
2、效果图
要比ugui中的mask组件的效果好很多
3、源码
// lizhihai
// 遮罩shader
Shader "Custom/CircleMask" ｛
Properties ｛
_MainTex ("MainTex", 2D) = "white" ｛｝
_MaskTex ("MaskTex", 2D) = "white" ｛｝
[HideInInspector]_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
//MASK SUPPORT ADD
_StencilComp ("Stencil Comparison", Float) = 8
_Stencil ("Stencil ID", Float) = 0
_StencilOp ("Stencil Operation", Float) = 0
_StencilWriteMask ("Stencil Write Mask", Float) = 255
_StencilReadMask ("Stencil Read Mask", Float) = 255
_ColorMask ("Color Mask", Float) = 15
//MASK SUPPORT END
｝
SubShader ｛
Tags ｛
"IgnoreProjector"="True"
"Queue"="Transparent"
"RenderType"="Transparent"
｝
//MASK SUPPORT ADD
Stencil
｛
Ref [_Stencil]
Comp [_StencilComp]
Pass [_StencilOp]
ReadMask [_StencilReadMask]
WriteMask [_StencilWriteMask]
｝
ColorMask [_ColorMask]
//MASK SUPPORT END
Pass ｛
Name "FORWARD"
Tags ｛
"LightMode"="ForwardBase"
｝
Blend SrcAlpha OneMinusSrcAlpha
ZWrite Off
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#define UNITY_PASS_FORWARDBASE
#include "UnityCG.cginc"
#pragma multi_compile_fwdbase
#pragma only_renderers d3d9 d3d11 glcore gles
#pragma target 3.0
uniform sampler2D _MainTex; uniform float4 _MainTex_ST;
uniform sampler2D _MaskTex; uniform float4 _MaskTex_ST;
struct VertexInput ｛
float4 vertex : POSITION;
float2 texcoord0 : TEXCOORD0;
｝;
struct VertexOutput ｛
float4 pos : SV_POSITION;
float2 uv0 : TEXCOORD0;
｝;
VertexOutput vert (VertexInput v) ｛
VertexOutput o = (VertexOutput)0;
o.uv0 = v.texcoord0;
o.pos = UnityObjectToClipPos( v.vertex );
return o;
｝
float4 frag(VertexOutput i) : COLOR ｛
////// Lighting:
float4 _MainTex_var = tex2D(_MainTex,TRANSFORM_TEX(i.uv0, _MainTex));
float3 finalColor = _MainTex_var.rgb;
float4 _MaskTex_var = tex2D(_MaskTex,TRANSFORM_TEX(i.uv0, _MaskTex));
return fixed4(finalColor,_MaskTex_var.a);
｝
ENDCG
｝
｝
FallBack "Diffuse"
｝