---
title: "glStencilFunc(_:_:_:)"
framework: OpenGL ES
role: symbol
role_heading: Function
platforms: [iOS 3.0+, iPadOS 3.0+, Mac Catalyst 3.0+, tvOS 9.0+]
path: "opengles/glstencilfunc(_:_:_:)"
---

# glStencilFunc(_:_:_:)

## Declaration

```swift
func glStencilFunc(_ func: GLenum, _ ref: GLint, _ mask: GLuint)
```