unity shader自我總結

分類

fixed shader：  shader1.0. 開關式

頂點 片段着色器 ： 2.0 功能自定義

Surface shader；以上功能的集成

流程：

頂點着色器（計算頂點顏色，燈光設置）》光柵化（頂點數據轉換爲片元的過程）》片段着色器（紋理採樣）》alpha測試》模板測試》深度測試》blend》Gbuffer》frontBuffer》顯示器

可對 頂點着色器  片段着色器 三大測試 編程

具體結構

Shader "Custom/NewSurfaceShader" //路徑
{
    Properties//公開屬性
    {
        _Color ("Color", Color) = (1,1,1,1)//color爲類型。
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0

        //name :變量名（“”//外部的公開標註 ,類型 =//默認值 Range//變化範圍 ）
    }
    SubShader//對應顯卡，符合顯卡運行才能執行
    {
	//pass 渲染一次
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM/// Unity的Cg程序預編譯命令
        // 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;

        // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
        // #pragma instancing_options assumeuniformscaling
        UNITY_INSTANCING_BUFFER_START(Props)
            // put more per-instance properties here
        UNITY_INSTANCING_BUFFER_END(Props)

        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"//所以SubShader都不合適，執行默認的
}