Getting started with UnityShader (3) - Unity's Shader

1 Unity Shader介绍

1.1 Unity Shader的基础：ShaderLab

1.2 Unity Shader属性块

Shader ""
{
    
	Properties
	{
    
		_Int("Int", Int) = 2
		_Float("Float", float) = 1.5
		_Range("Range", range(0.0, 2.0)) = 1.0
		_Color("Color", Color) = (1, 1, 1, 1)
		_Vector("Vector", Vector) = (1, 4, 3, 8)
		_MainTex("Texture", 2D) = "white"{
    }
		_3D("3D", 3D) = "black"{
    }
	}
}

1.3 Unity Shader SubShader

Tags

Tags可以写在SubShader的一开始（所有的Pass用）,也可以写在Pass块的内部（该Pass用）

渲染设置

同TagsThe same can also be written in Pass中或者写在Pass外面（SubShader一开始）

Pass介绍

Pass里面可以定义Pass名称
Pass里面的TagsThere can also be additional settings

还有CG语言所写的代码,Mainly vertex fragment shaders,Use the following keywords to wrap
CGPROGRAM
ENDCG

FallBack

2 SurfaceShader介绍

SurfaceShaderactually at the vertex、On the basis of the fragment shader, another layer of encapsulation is carried out,我们可以通过Show GenerateCode来查看到.（We can see the compiled vertices、Fragment shaders are very complex）

SurfaceShaderThe structure and front vertices、The structure of the fragment shader is the same.主要区别在于SubShader中.

3 UnityShader != 真正的Shader

Unity Shader实际上指的就是一个ShaderLab文件.以.shaderA file as a suffix.在Unity shader里面,我们可以做的事情远多于一个传统意义上的Shader.

在传统的shader中,我们仅可以编写特定类型的Shader,例如顶点着色器,片元着色器等.在Unity Shader中,We can include both vertex shader and fragment shader code needed in the same file.

在传统shader中,我们无法设置一些渲染设置,例如是否开启混合,深度测试等,These are set by developers themselves in additional code.而Unity shader中,We can complete these settings with a single line of specific instructions.

在传统shader中,We need to write lengthy code to set up the input and output of the shader,Be careful to deal with the positional correspondence of these inputs and outputs, etc.而在Unity shader中,We just need to declare some properties in a specific block of statements,You can easily change these properties by relying on materials.And for the data that comes with the model（如顶点,纹理坐标,法线等）,Unity Shader也提供了直接访问的方法,No developer coding is required to pass to the shader.