ar_tourism_flutter_unity/unity/VRProject2/Assets/Shader/RoundConor.shader

//图片圆角特效Shader
Shader "Custom/UI/RoundConor"
{
    Properties
    {
        [PerRendererData][MainTexture]
        _MainTex ("Sprite Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
 
        _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
 
        _RoundedCorner("Round",Vector)=(8,8,8,8)
        _Width("View Width", Float) = 200
        _Height("View Height", Float) = 200
        _BorderWidth("Border Width", Float) = 1
        _BorderColor("Boader Color", Color) = (1, 0, 0, 1)
    }
 
    SubShader
    {
        Tags
        {
            "Queue" = "Transparent"
            "IgnoreProjector" = "True"
            "RenderType" = "Transparent"
            "PreviewType" = "Plane"
            "CanUseSpriteAtlas" = "True"
        }
 
        Stencil
        {
            Ref[_Stencil]
            Comp[_StencilComp]
            Pass[_StencilOp]
            ReadMask[_StencilReadMask]
            WriteMask[_StencilWriteMask]
        }
 
        Cull Off
        Lighting Off
        ZWrite Off
        ZTest[unity_GUIZTestMode]
        Blend SrcAlpha OneMinusSrcAlpha
        ColorMask[_ColorMask]
 
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
 
            #include "UnityCG.cginc"
            #include "UnityUI.cginc"
 
            #pragma multi_compile __ UNITY_UI_ALPHACLIP
 
            struct appdata_t
            {
                float4 vertex : POSITION;
                float4 color : COLOR;
                float2 texcoord : TEXCOORD0;
            };
 
            struct v2f
            {
                float4 vertex : SV_POSITION;
                fixed4 color : COLOR;
                half2 texcoord :EXCOORD0;
                float4 worldPosition :TEXCOORD1;
            };
 
            float _Alpha;
 
            fixed4 _TextureSampleAdd;
            float4 _ClipRect;
 
            float4 _RoundedCorner;
            float _Width;
            float _Height;
            float _BorderWidth;
            float4 _BorderColor;
 
            float4 _MainTex_TexelSize; //纹理的大小，可能没有纹理，只有顶点颜色
            fixed4 _Color;
 
            v2f vert(appdata_t IN)
            {
                v2f OUT;
                OUT.worldPosition = IN.vertex;
                OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
 
                OUT.texcoord = IN.texcoord;
 
                OUT.color = IN.color * _Color;
                return OUT;
            }
 
            sampler2D _MainTex;
 
            fixed4 frag(v2f IN) : SV_Target
            {
                half4 color = IN.color;
                if (_MainTex_TexelSize.z > 0)
                {
                    //有纹理，则颜色从纹理读取， 并叠加顶点颜色
                    color = (tex2D(_MainTex, IN.texcoord)) * IN.color;
                }
                float width = _Width;
                float height = _Height;
 
                if (width <= 0 && _MainTex_TexelSize.z > 0)
                {
                    //如果没定义宽度，而纹理又定义了宽度，则从纹理宽度读取
                    width = _MainTex_TexelSize.z;
                }
                if (height <= 0 && _MainTex_TexelSize.w > 0)
                {
                    //同上
                    height = _MainTex_TexelSize.w;
                }
 
                float border_width = _BorderWidth;
                half4 border_color = _BorderColor;
 
                float x = IN.texcoord.x * width;
                float y = IN.texcoord.y * height;
 
 
                float arc_size = 0;
                float r = _RoundedCorner.w;
                //左下角
                if (x < r && y < r)
                {
                    arc_size = (x - r) * (x - r) + (y - r) * (y - r);
                    if (arc_size > r * r)
                    {
                        discard;
                    }
                    else if (border_width > 0 && arc_size > (r - border_width) * (r - border_width))
                    {
                        color = border_color;
                    }
                }
                r = _RoundedCorner.x;
                //左上角
                if (x < r && y > (height - r))
                {
                    arc_size = (x - r) * (x - r) + (y - (height - r)) * (y - (height - r));
                    if (arc_size > r * r)
                    {
                        discard;
                    }
                    else if (border_width > 0 && arc_size > (r - border_width) * (r - border_width))
                    {
                        color = border_color;
                    }
                }
                r = _RoundedCorner.z;
                //右下角
                if (x > (width - r) && y < r)
                {
                    arc_size = (x - (width - r)) * (x - (width - r)) + (y - r) * (y - r);
                    if (arc_size > r * r)
                    {
                        discard;
                    }
                    else if (border_width > 0 && arc_size > (r - border_width) * (r - border_width))
                    {
                        color = border_color;
                    }
                }
                r = _RoundedCorner.y;
                //右上角
                if (x > (width - r) && y > (height - r))
                {
                    arc_size = (x - (width - r)) * (x - (width - r)) + (y - (height - r)) * (y - (height - r));
                    if (arc_size > r * r)
                    {
                        discard;
                    }
                    else if (border_width > 0 && arc_size > (r - border_width) * (r - border_width))
                    {
                        color = border_color;
                    }
                }
 
                if (border_width > 0)
                {
                    //下边直线区域
                    if (x > _RoundedCorner.w && x < (width - _RoundedCorner.z) && y < border_width)
                    {
                        color = border_color;
                    }
                    //上边直线区域
                    if (x > _RoundedCorner.x && x < (width - _RoundedCorner.y) && (height - y) < border_width)
                    {
                        color = border_color;
                    }
                    //左边直线区域
                    if (y > _RoundedCorner.w && y < (height - _RoundedCorner.x) && x < border_width)
                    {
                        color = border_color;
                    }
                    //右边直线区域
                    if (y > _RoundedCorner.z && y < (height - _RoundedCorner.y) && x > (width - border_width))
                    {
                        color = border_color;
                    }
                }
 
                return color;
            }
            ENDCG
        }
    }
}