关于NGUI Shader 和 Draw Call的优化 & 模糊shader

序：

　　1.项目过程中不可避免的需要用到大量Shader 和 UITexture，由于Ngui对Shader支持非常糟糕，导致项目drawCall异常的高

　　2.Panel裁剪无法裁剪自定义shader内容，这部分暂不研究，后续再说

始：

　　1.本文主要解决项目中大量使用shader & UITexture 导致drawCall过高的问题（如下图），图中每个不同的图片都会导致增加一个drawCall，那么如何减少这个drawcall呢？当然只有打图集了！

步骤:

　　0. 将所有图片打包成图集，通过Texture中的偏移来显示，这样就能即使用shader又降低drawcall

1.如何获得对应的偏移数据呢？

using UnityEngine;
using System.Collections;

public class SpriteCut : MonoBehaviour
{
    private float widthRate;
    private float heightRate;
    private float xOffsetRate;
    private float yOffsetRate;
    private UISprite sprite;

    void Awake()
    {
        sprite = GetComponent<UISprite>();
        widthRate = sprite.GetAtlasSprite().width * 1.0f / sprite.atlas.spriteMaterial.mainTexture.width;
        heightRate = sprite.GetAtlasSprite().height * 1.0f / sprite.atlas.spriteMaterial.mainTexture.height;
        xOffsetRate = sprite.GetAtlasSprite().x * 1.0f / sprite.atlas.spriteMaterial.mainTexture.width;
        yOffsetRate = (sprite.atlas.spriteMaterial.mainTexture.height - (sprite.GetAtlasSprite().y + sprite.GetAtlasSprite().height)) * 1.0f / sprite.atlas.spriteMaterial.mainTexture.height;
    }

    private void Start()
    {
        Debug.Log("0 -----> " + widthRate);
        Debug.Log("1 -----> " + heightRate);
        Debug.Log("2 -----> " + xOffsetRate);
        Debug.Log("3 -----> " + yOffsetRate);
        sprite.atlas.spriteMaterial.SetFloat("_WidthRate", widthRate);
        sprite.atlas.spriteMaterial.SetFloat("_HeightRate", heightRate);
        sprite.atlas.spriteMaterial.SetFloat("_XOffset", xOffsetRate);
        sprite.atlas.spriteMaterial.SetFloat("_YOffset", yOffsetRate);
    }
}

讲上述代码挂载图集下的sprite组件上，就会自动打印偏移数据 ，再将数据填到uitexture中即可

模糊shader：

　　CG版：

Shader "Custom/BlurShader0" 
{
    Properties
    {
        _MainTex("Albedo (RGB)", 2D) = "white" {}
        _TextureSize("_TextureSize",Float) = 256
        _BlurRadiusX("_BlurRadiusX",Range(1,30)) = 5
        _BlurRadiusY("_BlurRadiusY",Range(1,30)) = 5
    }
        SubShader{
        Tags
        { 
            "Queue" = "Transparent"
            "IgnoreProjector" = "True"
            "RenderType" = "Transparent"
        }
        LOD 200

        Pass{

            Cull Off
            Lighting Off
            ZWrite Off
            Fog{ Mode Off }
            Offset -1, -1
            Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM

#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"


        sampler2D _MainTex;
    int _BlurRadiusX; int _BlurRadiusY;
    float _TextureSize;

    struct v2f {
        float4 pos : SV_POSITION;
        float2 uv : TEXCOORD0;
    };


    v2f vert(appdata_img v)
    {
        v2f o;
        o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
        o.uv = v.texcoord.xy;
        return o;
    }

    // ----- 普通模糊 --- Start ---

    float4 GetBlurColor(float2 uv)
    {

        float space = 1.0 / _TextureSize; //算出一个像素的空间
        int count = (_BlurRadiusX * 2 + 1) *(_BlurRadiusY * 2 + 1);

        //将以自己为中心，周围半径的所有颜色相加，然后除以总数，求得平均值
        float4 colorTmp = float4(0, 0, 0, 0);
        for (int x = -_BlurRadiusX; x <= _BlurRadiusX; x++)
        {
            for (int y = -_BlurRadiusY; y <= _BlurRadiusY; y++)
            {
                float4 color = tex2D(_MainTex, uv + float2(x * space, y * space));
                colorTmp += color;
            }
        }
        return colorTmp / count;
    }

    // ----- 普通模糊 --- End ---

    //// ----- 高斯模糊 --- Start ---
    //float GetGaussianDistribution(float x, float y, float rho) {
    //    float g = 1.0f / sqrt(2.0f * 3.141592654f * rho * rho);
    //    return g * exp(-(x * x + y * y) / (2 * rho * rho));
    //}

    //float4 GetGaussBlurColor(float2 uv)
    //{
    //    //算出一个像素的空间
    //    float space = 1.0 / _TextureSize;
    //    //参考正态分布曲线图，可以知道 3σ 距离以外的点，权重已经微不足道了。
    //    //反推即可知道当模糊半径为r时，取σ为 r/3 是一个比较合适的取值。
    //    float rho = (float)_BlurRadius * space / 3.0;

    //    //---权重总和
    //    float weightTotal = 0;
    //    for (int x = -_BlurRadius; x <= _BlurRadius; x++)
    //    {
    //        for (int y = -_BlurRadius; y <= _BlurRadius; y++)
    //        {
    //            weightTotal += GetGaussianDistribution(x * space, y * space, rho);
    //        }
    //    }

    //    float4 colorTmp = float4(0, 0, 0, 0);
    //    for (int x = -_BlurRadius; x <= _BlurRadius; x++)
    //    {
    //        for (int y = -_BlurRadius; y <= _BlurRadius; y++)
    //        {
    //            float weight = GetGaussianDistribution(x * space, y * space, rho) / weightTotal;

    //            float4 color = tex2D(_MainTex, uv + float2(x * space, y * space));
    //            color = color * weight;
    //            colorTmp += color;
    //        }
    //    }
    //    return colorTmp;
    //}

    // ----- 高斯模糊 --- End ---

    half4 frag(v2f i) : SV_Target
    {
        //调用普通模糊
        return GetBlurColor(i.uv);
        //调用高斯模糊  
        //return GetGaussBlurColor(i.uv);
        //return tex2D(_MainTex,i.uv);
    }
        ENDCG
    }
    }
        FallBack "Diffuse"
}

　　ShaderForge版本：

// Shader created with Shader Forge v1.26 
// Shader Forge (c) Neat Corporation / Joachim Holmer - http://www.acegikmo.com/shaderforge/
// Note: Manually altering this data may prevent you from opening it in Shader Forge
/*SF_DATA;ver:1.26;sub:START;pass:START;ps:flbk:,iptp:0,cusa:False,bamd:0,lico:1,lgpr:1,limd:0,spmd:1,trmd:0,grmd:0,uamb:True,mssp:True,bkdf:False,hqlp:False,rprd:False,enco:False,rmgx:True,rpth:0,vtps:0,hqsc:True,nrmq:1,nrsp:0,vomd:0,spxs:False,tesm:0,olmd:1,culm:0,bsrc:3,bdst:7,dpts:2,wrdp:False,dith:0,rfrpo:True,rfrpn:Refraction,coma:15,ufog:True,aust:True,igpj:True,qofs:0,qpre:3,rntp:2,fgom:False,fgoc:False,fgod:False,fgor:False,fgmd:0,fgcr:0.5,fgcg:0.5,fgcb:0.5,fgca:1,fgde:0.01,fgrn:0,fgrf:300,stcl:False,stva:128,stmr:255,stmw:255,stcp:6,stps:0,stfa:0,stfz:0,ofsf:0,ofsu:0,f2p0:False,fnsp:False,fnfb:False;n:type:ShaderForge.SFN_Final,id:3621,x:33355,y:32491,varname:node_3621,prsc:2|custl-9735-OUT,alpha-7088-OUT;n:type:ShaderForge.SFN_Tex2d,id:4388,x:31667,y:32867,ptovrint:False,ptlb:MainTex,ptin:_MainTex,varname:node_4388,prsc:2,glob:False,taghide:False,taghdr:False,tagprd:False,tagnsco:False,tagnrm:False,tex:78ce40c225472e94980ad971e903e803,ntxv:0,isnm:False|UVIN-6708-UVOUT;n:type:ShaderForge.SFN_TexCoord,id:6708,x:31299,y:32828,varname:node_6708,prsc:2,uv:0;n:type:ShaderForge.SFN_Code,id:9735,x:31557,y:32568,varname:node_9735,prsc:2,code: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,output:3,fname:Func0,638,height:297,input:1,input:0,input:0,input:0,input_1_label:uv,input_2_label:_BlurRadiusX,input_3_label:_BlurRadiusY,input_4_label:_TexSize|A-6708-UVOUT,B-9066-OUT,C-3534-OUT,D-6201-OUT;n:type:ShaderForge.SFN_Slider,id:9066,x:31372,y:32550,ptovrint:False,ptlb:BlurRadiusX,ptin:_BlurRadiusX,varname:node_9066,prsc:2,glob:False,taghide:False,taghdr:False,tagprd:False,tagnsco:False,tagnrm:False,min:0,cur:1,max:1;n:type:ShaderForge.SFN_Slider,id:3534,x:31358,y:32656,ptovrint:False,ptlb:BlurRadiusY,ptin:_BlurRadiusY,varname:_BlurRadiusX_copy,prsc:2,glob:False,taghide:False,taghdr:False,tagprd:False,tagnsco:False,tagnrm:False,min:0,cur:15,max:30;n:type:ShaderForge.SFN_ComponentMask,id:3967,x:32639,y:32731,varname:node_3967,prsc:2,cc1:3,cc2:-1,cc3:-1,cc4:-1|IN-9735-OUT;n:type:ShaderForge.SFN_Multiply,id:1393,x:32621,y:32923,varname:node_1393,prsc:2|A-4388-A,B-2522-OUT;n:type:ShaderForge.SFN_Vector1,id:2522,x:32368,y:32988,varname:node_2522,prsc:2,v1:0;n:type:ShaderForge.SFN_Add,id:7088,x:32894,y:32839,varname:node_7088,prsc:2|A-3967-OUT,B-1393-OUT;n:type:ShaderForge.SFN_ValueProperty,id:6201,x:31679,y:32771,ptovrint:False,ptlb:TexSize,ptin:_TexSize,varname:node_6201,prsc:2,glob:False,taghide:False,taghdr:False,tagprd:False,tagnsco:False,tagnrm:False,v1:1024;proporder:4388-9066-3534-6201;pass:END;sub:END;*/

Shader "Custom/BlurShader1" {
    Properties {
        _MainTex ("MainTex", 2D) = "white" {}
        _BlurRadiusX ("BlurRadiusX", Range(0, 1)) = 1
        _BlurRadiusY ("BlurRadiusY", Range(0, 30)) = 15
        _TexSize ("TexSize", Float ) = 1024
        [HideInInspector]_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
    }
    SubShader {
        Tags {
            "IgnoreProjector"="True"
            "Queue"="Transparent"
            "RenderType"="Transparent"
        }
        LOD 200
        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 multi_compile_fog
            #pragma exclude_renderers gles3 metal d3d11_9x xbox360 xboxone ps3 ps4 psp2 
            #pragma target 3.0
            uniform sampler2D _MainTex; uniform float4 _MainTex_ST;
            float4 Func0( float2 uv , float _BlurRadiusX , float _BlurRadiusY , float _TexSize ){
            float space = 1.0 / _TexSize;
            int count = (_BlurRadiusX * 2 + 1) *(_BlurRadiusY * 2 + 1);
            float4 colorTmp = float4(0, 0, 0, 0);
            for (int x = -_BlurRadiusX; x <= _BlurRadiusX; x++)
            {
            for (int y = -_BlurRadiusY; y <= _BlurRadiusY; y++)
             {
             float4 color = tex2D(_MainTex, uv + float2(x * space, y * space));
             colorTmp += color;
             }
            }
            return colorTmp / count;
            }
            
            uniform float _BlurRadiusX;
            uniform float _BlurRadiusY;
            uniform float _TexSize;
            struct VertexInput {
                float4 vertex : POSITION;
                float2 texcoord0 : TEXCOORD0;
            };
            struct VertexOutput {
                float4 pos : SV_POSITION;
                float2 uv0 : TEXCOORD0;
                UNITY_FOG_COORDS(1)
            };
            VertexOutput vert (VertexInput v) {
                VertexOutput o = (VertexOutput)0;
                o.uv0 = v.texcoord0;
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex );
                UNITY_TRANSFER_FOG(o,o.pos);
                return o;
            }
            float4 frag(VertexOutput i) : COLOR {
////// Lighting:
                float4 node_9735 = Func0( i.uv0 , _BlurRadiusX , _BlurRadiusY , _TexSize );
                float3 finalColor = node_9735.rgb;
                float4 _MainTex_var = tex2D(_MainTex,TRANSFORM_TEX(i.uv0, _MainTex));
                fixed4 finalRGBA = fixed4(finalColor,(node_9735.a+(_MainTex_var.a*0.0)));
                UNITY_APPLY_FOG(i.fogCoord, finalRGBA);
                return finalRGBA;
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
    CustomEditor "ShaderForgeMaterialInspector"
}

我先留个记录，后面整理，最近太忙了··先这样吧 ->- >

不行！！！ 打成图集模糊的时候会出现旁边的象素误入的问题，还没办法解决！！！

放弃此方法 而且裁减边太过于明显！！