URP Shader constant buffer CBUFFER in Unity

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Preface

In the previous article, we got the simplest URP Shader.

• Shader URP in Unity is the simplest Shader framework (summary)

In this article, let's take a look at URP Shader's constant buffer CBUFFER.

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1. Steps to use constant buffer CBUFFER

使用步骤和BRP下的属性使用步骤几乎一致

1. Define the attributes we need to use in the attribute panel

Properties 
{
	_Color("Color",Color) = (0,0,0,0)
}

2. In Pass, you need to declare it in advance before using it.

这里声明，必须声明在 这 两个标识中间 才能发挥 常量缓冲区 的作用。

CBUFFER_START(UnityPerMaterial)
half4 _Color;
CBUFFER_END

• What do these two logos do?
  

• UnityPerMaterial represents the data in our property panel

• After this declaration, our programmable rendering pipeline can be allowed to be batched
  

• Without using a constant buffer, programmable rendering pipeline batching is not allowed.
  

3. When using, just use it directly

half4 frag(Varyings i) : SV_TARGET
{
	half4 c;
	c = _Color;
	return c;
}

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2. Benefits of using constant buffer CBUFFER

Ability to support our Shader being allowed by SRP Batcher (Programmable Rendering Pipeline Batch), thus saving rendering performance.

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3. ShaderGraph attributes and corresponding Shader functions

1. We create a color attribute

2. Use (drag it out from the properties panel and connect the output to the color input port)

3. ShaderGraph uses the constant buffer CBUFFER by default.

• Let’s compile and take a look