---
title: "glTransformFeedbackVaryings(_:_:_:_:)"
framework: OpenGL ES
role: symbol
role_heading: Function
platforms: [iOS 7.0+, iPadOS 7.0+, Mac Catalyst 7.0+, tvOS 9.0+]
path: "opengles/gltransformfeedbackvaryings(_:_:_:_:)"
---

# glTransformFeedbackVaryings(_:_:_:_:)

## Declaration

```swift
func glTransformFeedbackVaryings(_ program: GLuint, _ count: GLsizei, _ varyings: UnsafePointer<UnsafePointer<GLchar>?>!, _ bufferMode: GLenum)
```