MRSupport_SupportPhone/Assets/Remote3.1/MyAtlas/Shader/mao.shader


Shader "Custom/WaterBlur" {

    Properties{

    _blurSizeXY("BlurSizeXY", Range(0,15)) = 2

    }

        SubShader{

            Tags {

                "IgnoreProjector" = "True"

                "Queue" = "Transparent"

                "RenderType" = "Transparent"

                "CanUseSpriteAtlas" = "True"

                "PreviewType" = "Plane"

            }

        //获取屏幕纹理，必须的

        GrabPass { }

        // Render the object with the texture generated above  

        Pass {

             CGPROGRAM

            #pragma debug  

            #pragma vertex vert  

            #pragma fragment frag   

            #pragma target 3.0  

             //屏幕纹理定义

             sampler2D _GrabTexture : register(s0);

             float _blurSizeXY;



             struct data {

             float4 vertex : POSITION;

             float3 normal : NORMAL;

             };

             struct v2f {

             float4 position : POSITION;

             float4 screenPos : TEXCOORD0;

             };

            v2f vert(data i) {

            v2f o;

            o.position = UnityObjectToClipPos(i.vertex);

            o.screenPos = o.position;

            return o;

            }

            //核心逻辑就是使用多次采样纹理，然后混合多次，采样的对象是屏幕纹理，实现高斯模糊

            half4 frag(v2f i) : COLOR

            {

                //模糊的原理就是错开uv来采样，实现模糊

                float2 screenPos = i.screenPos.xy / i.screenPos.w;

                float depth = _blurSizeXY * 0.0005;

                screenPos.x = (screenPos.x + 1) * 0.5;



                screenPos.y = 1 - (screenPos.y + 1) * 0.5;



                half4 sum = half4(0.0h,0.0h,0.0h,0.0h);

                sum += tex2D(_GrabTexture, float2(screenPos.x - 5.0 * depth, screenPos.y + 3.0 * depth)) * 0.025;

                sum += tex2D(_GrabTexture, float2(screenPos.x + 5.0 * depth, screenPos.y - 3.0 * depth)) * 0.025;



                sum += tex2D(_GrabTexture, float2(screenPos.x - 4.0 * depth, screenPos.y + 2.5 * depth)) * 0.05;

                sum += tex2D(_GrabTexture, float2(screenPos.x + 4.0 * depth, screenPos.y - 2.5 * depth)) * 0.05;





                sum += tex2D(_GrabTexture, float2(screenPos.x - 3.0 * depth, screenPos.y + 2.0 * depth)) * 0.09;

                sum += tex2D(_GrabTexture, float2(screenPos.x + 3.0 * depth, screenPos.y - 2.0 * depth)) * 0.09;



                sum += tex2D(_GrabTexture, float2(screenPos.x - 2.0 * depth, screenPos.y + 1.5 * depth)) * 0.12;

                sum += tex2D(_GrabTexture, float2(screenPos.x + 2.0 * depth, screenPos.y - 1.5 * depth)) * 0.12;



                sum += tex2D(_GrabTexture, float2(screenPos.x - 1.0 * depth, screenPos.y + 1.0 * depth)) * 0.15;

                sum += tex2D(_GrabTexture, float2(screenPos.x + 1.0 * depth, screenPos.y - 1.0 * depth)) * 0.15;



                sum += tex2D(_GrabTexture, screenPos - 3.0 * depth) * 0.025;

                sum += tex2D(_GrabTexture, screenPos - 2.5 * depth) * 0.05;

                sum += tex2D(_GrabTexture, screenPos - 2.0 * depth) * 0.09;

                sum += tex2D(_GrabTexture, screenPos - 1.5 * depth) * 0.12;

                sum += tex2D(_GrabTexture, screenPos - 1.0 * depth) * 0.15;

                sum += tex2D(_GrabTexture, screenPos) * 0.16;

                sum += tex2D(_GrabTexture, screenPos + 3.0 * depth) * 0.15;

                sum += tex2D(_GrabTexture, screenPos + 2.5 * depth) * 0.12;

                sum += tex2D(_GrabTexture, screenPos + 2.0 * depth) * 0.09;

                sum += tex2D(_GrabTexture, screenPos + 1.5 * depth) * 0.05;

                sum += tex2D(_GrabTexture, screenPos + 1.0 * depth) * 0.025;

                return sum / 2;

                }

                ENDCG

             }

    }

        Fallback Off

}