视频链接 Shaders 101 - Intro to Shaders

Shader入门代码
Index of /Shaders

Unity Shader中的各种tag
Unity Shader中的各种tag

Unity的着色器输入语义
向顶点程序提供顶点数据 - Unity 手册

关于Unity Shader的不同混合
Shader Blend混合效果

一个很简单的color some pixel from some data from the mesh的

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
//这是被放在一个GameObject下面，用MeshRenderer还有Quad的Mesh Filter呈现的

Shader "Unlit/basic"
{
    Properties
    {
        _MainTex("Texture", 2D) = "white" {}
        _color123("Color",Color) = (1,1,1,1)
        _SecondTex("Second Texture", 2D) = "white" {}
        _Tween("Tween", Range(0, 1)) = 0
        
    }

    SubShader
    {
        Tags
        {
            "Queue" = "Transparent"
            "PreviewType" = "Plane"
        }
        Pass
        {
            //Blend SrcAlpha OneMinusSrcAlpha

            Blend One One

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

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

            v2f vert(appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            //局部定义 define main tex in the scope of our CG programm as a sampler2d 否则shader是不会compile的
            sampler2D _MainTex;
            sampler2D _SecondTex;
            float _Tween;
            float4 _color123;

            float4 frag(v2f i) : SV_Target
            {
                //tex自己的颜色与颜色相乘再与uv的rgb值相乘
                //float4 color1 = tex2D(_MainTex,i.uv)* _color123 * float4(i.uv.x,i.uv.y,0,1);

                float4 color = tex2D(_MainTex, i.uv);
                //float4 color2 = tex2D(_SecondTex, i.uv)* _color123 * float4(i.uv.y, i.uv.x, 1, 1);
                
                //float4 color = tex2D(_MainTex, i.uv * 2) * float4 (i.uv.r, i.uv.g, 1, 1);
                //float4 color = lerp(color1, color2, _Tween);
                //float4 color = float4(i.uv.x, i.uv.y,1,1);


                //
                //灰度
                //float lum = color.r * 0.3 + color.g * 0.59 + color.b * 0.11;
                //float4 grayscale = float4(lum, lum, lum, color.a);
                //return grayscale*_color123;
                
                //使用Blend One One需要x透明通道
                return color * color.a;
            }
            ENDCG
        }
    }
}

image.png

Properties的命名，第一个是变量名，“”里的是显示名，数据格式，默认；

https://docs.unity3d.com/cn/current/Manual/SL-Properties.html