Pass block in ShaderLab reference

Important: The Built-In Render Pipeline is deprecated and will be made obsolete in a future release.
It remains supported, including bug fixes and maintenance, through the full Unity 6.7 LTS lifecycle.
For more information on migration, refer to Migrating from the Built-In Render Pipeline to the Universal Render Pipeline and Render pipeline feature comparison.

To define a Pass in ShaderLab, use a Pass block. This page contains information on using Pass blocks. For information on how a Shader object works, and the relationship between Shader objects, SubShaders and Passes, see Shader object fundamentals.

Inside the Pass block, you can:

Assign a name to the Pass, using a Name block. See ShaderLab: assigning a name to a Pass.
Assign key-value pairs of data to the Pass, using a Tags block. See ShaderLab: assigning tags to a Pass.
Perform operations using ShaderLab commands. See ShaderLab: using commands.
Add shader code to the Pass, using a shader code block. See ShaderLab: shader code blocks.
Specify package requirements using the PackageRequirements block. This makes Unity only run the Pass if the required packages are installed. See ShaderLab: specifying package requirements.

Render pipeline compatibility

Feature name	Universal Render Pipeline (URP)	High Definition Render Pipeline (HDRP)	Custom SRP	Built-in Render Pipeline
ShaderLab: Pass block	Yes	Yes	Yes	Yes

Syntax

Signature	Function
`Pass` `{` `<optional: name>` `<optional: tags>` `<optional: commands>` `<optional: shader code>` `}`	Defines a Pass.

Additional resources

Add a shader pass in a custom shader

Pass in ShaderLab reference

Name directive in ShaderLab reference