When a global and local shaderA program that runs on the GPU. More info
See in Glossary keyword with the same name have different states, Unity uses the isOverridable
property of a LocalKeyword
to determine whether the keyword is enabled or disabled for an individual material or compute shader. isOverridable
is true if the keyword was declared with global scope, and false
if it was declared with local scope.
isOverridable
is true
: If a global keyword with the same name exists and is enabled, Unity uses the state of the global keyword. Otherwise, Unity uses the state of the local keyword.isOverridable
is false
: Unity always uses the state of the local keyword.Therefore, to understand whether a shader keyword is enabled or disabled for an individual material or compute shader, you must examine the state of the isOverridable
property and the global and/or local keyword state.
This example demonstrates how to check whether Unity considers a keyword enabled or disabled for a material:
using UnityEngine; using UnityEngine.Rendering; public class KeywordExample : MonoBehaviour { public Material material; void Start() { CheckShaderKeywordState(); } void CheckShaderKeywordState() { // Get the instance of the Shader class that the material uses var shader = material.shader; // Get all the local keywords that affect the Shader var keywordSpace = shader.keywordSpace; // Iterate over the local keywords foreach (var localKeyword in keywordSpace.keywords) { // If the local keyword is overridable (i.e., it was declared with a global scope), // and a global keyword with the same name exists and is enabled, // then Unity uses the global keyword state if (localKeyword.isOverridable && Shader.IsKeywordEnabled(localKeyword.name)) { Debug.Log("Local keyword with name of " + localKeyword.name + " is overridden by a global keyword, and is enabled"); } // Otherwise, Unity uses the local keyword state else { var state = material.IsKeywordEnabled(localKeyword) ? "enabled" : "disabled"; Debug.Log("Local keyword with name of " + localKeyword.name + " is " + state); } } } }
To check whether a local keyword is enabled for a graphics shader, use Material.IsKeywordEnabled or Material.EnableKeyword. For a compute shader, use ComputeShader.IsKeywordEnabled, or ComputeShader.EnableKeyword.
To check whether a global keyword is enabled, use Shader.IsKeywordEnabled or Shader.EnableKeyword or ComputeShader.enabledKeywords.
To enable or disable a local shader keyword for a graphics shader, use Material.SetKeyword, Material.EnableKeyword, or Material.DisableKeyword. For a compute shader, use ComputeShader.SetKeyword, ComputeShader.EnableKeyword, or ComputeShader.DisableKeyword.
To enable or disable a global shader keyword, use Shader.SetKeyword, ComputeShader.EnableKeyword, or ComputeShader.DisableKeyword.
To enable or disable a local or global keyword with a Command Buffer, use CommandBuffer.EnableKeyword, or CommandBuffer.DisableKeyword .
Note: When you enable or disable keywords that work with shader variants, Unity uses different shader variants. Changing shader variants at runtime can impact performance. If a change in keywords requires a variant to be used for the first time, it can lead to hitches while the graphics driver prepares the shader program. This can be a particular problem for large or complex shaders, or if a global keyword state change affects multiple shaders. To avoid this, if you use keywords with shader variants, ensure that you consider keyword variants in your shader loading and prewarming strategy. For more information, see Shader loading.
In Unity, you can use shader keywords with shader variants, or you can use them with dynamic branching. You decide when you declare the keywords.
The isDynamic property of a LocalKeyword
indicates whether the keyword was declared for use with dynamic branching in the shader source file. It is true
if the keyword was declared for use with dynamic branching, and false
if it was declared for use with shader variants.
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.
When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.
More information
These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising. Some 3rd party video providers do not allow video views without targeting cookies. If you are experiencing difficulty viewing a video, you will need to set your cookie preferences for targeting to yes if you wish to view videos from these providers. Unity does not control this.
These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. These cookies do not store any personally identifiable information.