Properties property

Shader syntax is case insensitive

basic data type

how to define a property

Properties are defined in the "Properties{}" code block

 Properties{
        _Color("Main Color",Color) = (1,1,1,1)
        _Shininess("Shininess",range(0,8)) = 4
        _MainTex("MainTex",2D) = ""{}
}

The composition of an attribute

   _Color("Main Color",Color) = (1,1,1,1)

_Color : attribute name (the name used when calling this attribute in the following code block)
"Main Color" : In Unity, the name we see in the panel
Color : data type
(1,1,1,1) : the default value of the data

SubShader shader code block

There can be one or more "SubShader{}" in a Shader, but the graphics card can only select one SubShaders to execute each time it renders

The execution sequence is to process the top "SubShader{}" first. If the graphics card version does not support the first "SubShader{}" , the following "SubShader{}" will be executed sequentially.

When writing multiple "SubShader{}" , generally the first one is the most complex and has the highest requirements for the graphics card. Write "SubShader{}" that supports lower-version graphics cards in turn . The further down, the simpler the algorithm and instructions

pass channel

"Pass{}" is written in the SubShader{} code block

"Pass{}" contains a series of rendering state setting commands

Name

Use the Name command to set a name for the Pass channel, which can be accessed through a C# script

  Pass{    
              Name "ExampleNamedPass"
}

Tag

Labels are key-value pairs of data that can be assigned to channels. Unity uses predefined tags and values to determine how and when to render a given pass. You can also create your own custom channel labels with custom values and access them from C# code.

Shader "Examples/SinglePass"
{
    SubShader
    {
        Pass
        {                
              Name "ExamplePassName"
              Tags { "ExampleTagKey" = "ExampleTagValue" }

              // ShaderLab commands go here.

              // HLSL code goes here.
        }
    }
}

For example

Set shader properties
set lighting
Set texture properties
set transparency

wait

Material material

Diffuse[_Color] _color is a property defined in Properties

  Material{
                Diffuse[_Color]         //材质球颜色
                Ambient[_Ambient]       //材质球环境光
                Specular[_Specular]     //高光    搭配 Separatespecular 使用
                Shininess[_Shininess]   //高光强度
                Emission[_Emission]     //自发光
}
            Separatespecular On         //独立的镜面的高光效果 打开

Lighting

Lighting On //The lighting effect is turned on (off is turned off)

Settexture map

   Settexture[_MainTex]        //设置贴图 Settexture只能设置一张贴图
            {
                combine texture * primary double    //combine-混合    texture-贴图    primary-之前计算好的顶点光照    (double-数值翻倍,quad-数值×4)
            }
             Settexture[_SecondTex] 
            {
                constantColor[_Constant]                                //生成 constant 的颜色信息 
                combine texture * previous double , texture * constant  //previous-之前所有顶点光照贴图计算的数据     ,texture-在","添加texture,意思是使用贴图的透明通道信息    constant贴图再混合一个color属性调整透明度
            }

full code

Shader "Custom/TestShader"
{
    Properties{
        _Color("Main Color",Color) = (1,1,1,1)
        _Ambient("Ambient",Color) = (0.3,0.3,0.3,0.3)
        _Specular("Specular",Color)= (1,1,1,1)
        _Shininess("Shininess",range(0,8)) = 4
        _Emission("Emission",Color) = (1,1,1,1)
        _MainTex("MainTex",2D) = "white"{}
        _SecondTex("SecondTex",2D) = ""{}
        _Constant("ConstantColor",Color) = (1,1,1,0.3)
    }

    SubShader
    {
        Tags { "Queue"="Transparent" }          //设置渲染顺序
        Pass{
            Blend SrcAlpha OneMinusSrcAlpha     //混合透明通道
            //Color(1,0,0,1)
            //Color[_Color]

            Material{
                Diffuse[_Color]         //材质球颜色
                Ambient[_Ambient]       //材质球环境光
                Specular[_Specular]     //高光    搭配 Separatespecular 使用
                Shininess[_Shininess]   //高光强度
                Emission[_Emission]     //自发光
            }
            Lighting On                 //光照效果 打开  (off关闭)
            Separatespecular On         //独立的镜面的高光效果 打开

            Settexture[_MainTex]        //设置贴图 Settexture只能设置一张贴图
            {
                combine texture * primary double    //combine-混合    texture-贴图    primary-之前计算好的顶点光照    (double-数值翻倍,quad-数值×4)
            }
             Settexture[_SecondTex] 
            {
                constantColor[_Constant]                                //生成 constant 的颜色信息 
                combine texture * previous double , texture * constant  //previous-之前所有顶点光照贴图计算的数据     ,texture-在","添加texture,意思是使用贴图的透明通道信息    constant贴图再混合一个color属性调整透明度
            }
        }
    }
}

Fixed Function Shader