关于程序员:Unity-Shader学习笔记

 在Unity5.2及以上版本中，Unity一共提供了4中UnityShader模板供咱们抉择，别离是：UnlitShader、SurfaceShader、ImageEffectShader、ComputeShader。

    SurfaceShader：会产生一个蕴含了规范光照模型的外表着色器模板，代码如下：

Shader "Custom/SurfaceShader" {

Properties {    _Color ("Color", Color) = (1,1,1,1)    _MainTex ("Albedo (RGB)", 2D) = "white" {}    _Glossiness ("Smoothness", Range(0,1)) = 0.5    _Metallic ("Metallic", Range(0,1)) = 0.0}SubShader {    Tags { "RenderType"="Opaque" }    LOD 200        CGPROGRAM    // Physically based Standard lighting model, and enable shadows on all light types    #pragma surface surf Standard fullforwardshadows    // Use shader model 3.0 target, to get nicer looking lighting    #pragma target 3.0    sampler2D _MainTex;    struct Input {        float2 uv_MainTex;    };    half _Glossiness;    half _Metallic;    fixed4 _Color;    void surf (Input IN, inout SurfaceOutputStandard o) {        // Albedo comes from a texture tinted by color        fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;        o.Albedo = c.rgb;        // Metallic and smoothness come from slider variables        o.Metallic = _Metallic;        o.Smoothness = _Glossiness;        o.Alpha = c.a;    }    ENDCG} FallBack "Diffuse"

}
Unlit Shader 会产生一个不蕴含光照（但蕴含雾效）的根本顶点/片元着色器，代码如下：

Shader "Unlit/UnlitShader"
{

Properties{    _MainTex ("Texture", 2D) = "white" {}}SubShader{    Tags { "RenderType"="Opaque" }    LOD 100    Pass    {        CGPROGRAM        #pragma vertex vert        #pragma fragment frag        // make fog work        #pragma multi_compile_fog                #include "UnityCG.cginc"        struct appdata        {            float4 vertex : POSITION;            float2 uv : TEXCOORD0;        };        struct v2f        {            float2 uv : TEXCOORD0;            UNITY_FOG_COORDS(1)            float4 vertex : SV_POSITION;        };        sampler2D _MainTex;        float4 _MainTex_ST;                v2f vert (appdata v)        {            v2f o;            o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);            o.uv = TRANSFORM_TEX(v.uv, _MainTex);            UNITY_TRANSFER_FOG(o,o.vertex);            return o;        }                fixed4 frag (v2f i) : SV_Target        {            // sample the texture            fixed4 col = tex2D(_MainTex, i.uv);            // apply fog            UNITY_APPLY_FOG(i.fogCoord, col);                            return col;        }        ENDCG    }}

}

Image Effect Shader 则为咱们实现各种屏幕后处理成果提供了一个模板，代码如下：

Shader "Hidden/ImageEffectShader"
{

Properties{    _MainTex ("Texture", 2D) = "white" {}}SubShader{    // No culling or depth    Cull Off ZWrite Off ZTest Always    Pass    {        CGPROGRAM        #pragma vertex vert        #pragma fragment frag                #include "UnityCG.cginc"        struct appdata        {            float4 vertex : POSITION;            float2 uv : TEXCOORD0;        };        struct v2f        {            float2 uv : TEXCOORD0;            float4 vertex : SV_POSITION;        };        v2f vert (appdata v)        {            v2f o;            o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);            o.uv = v.uv;            return o;        }                sampler2D _MainTex;        fixed4 frag (v2f i) : SV_Target        {            fixed4 col = tex2D(_MainTex, i.uv);            // just invert the colors            col = 1 - col;            return col;        }        ENDCG    }}

}
Compute Shader会产生一张非凡的Shader文件，这类Shader旨在利用GPU的并行性来进行一些与惯例渲染流水线无关的计算,
与失常着色器相似，Compute着色器是我的项目中的资源文件，具备* .compute文件扩展名。 它们是用DirectX 11格调的HLSL语言编写的，用最大量的#pragma编译指令来批示哪些函数要编译为计算着色器内核。