---
name: "glutEntryFunc"
section: "3"
platform: "linux"
package: "freeglut"
version: "3.8.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/glutEntryFunc"
---

# glutEntryFunc(3)

sets the mouse enter/leave callback for the current window.

## NAME

glutEntryFunc - sets the mouse enter/leave callback for the current window.

## SYNTAX

```

```

void glutEntryFunc(void (\*func)(int state));

## ARGUMENTS

- *func*

  The new entry callback function.

## DESCRIPTION

glutEntryFunc sets the mouse enter/leave callback for the current window. The state callback parameter is either GLUT\_LEFT or GLUT\_ENTERED depending on if the mouse pointer has last left or entered the window.

Passing NULL to glutEntryFunc disables the generation of the mouse enter/leave callback.

Some window systems may not generate accurate enter/leave callbacks. X IMPLEMENTATION NOTES An X implementation of GLUT should generate accurate enter/leave callbacks.

## SEE ALSO

glutMotionFunc, glutCreateWindow

## AUTHOR

Mark J. Kilgard (mjk@nvidia.com)