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

# glutDialsFunc(3)

sets the dial & button box dials callback for the current window.

## NAME

glutDialsFunc - sets the dial & button box dials callback for the current window.

## SYNTAX

```

```

void glutDialsFunc(void (\*func)(int dial, int value));

## ARGUMENTS

- *func*

  The new dials callback function.

## DESCRIPTION

glutDialsFunc sets the dial & button box dials callback for the current window. The dial & button box dials callback for a window is called when the window has dial & button box input focus (normally, when the mouse is in the window) and the user generates dial & button box dial changes. The dial parameter will be the dial number (starting at one). The number of available dial & button box dials can be determined with glutDeviceGet(GLUT\_NUM\_DIALS). The value measures the absolute rotation in degrees. Dial values do not \`\`roll over'' with each complete rotation but continue to accumulate degrees (until the int dial value overflows).

Registering a dial & button box dials callback when a dial & button box device is not available is ineffectual and not an error. In this case, no dial & button box dials callbacks will be generated.

Passing NULL to glutDialsFunc disables the generation of dial & button box dials callbacks. When a new window is created, no dial & button box dials callback is initially registered.

## SEE ALSO

glutButtonBoxFunc, glutDeviceGet

## AUTHOR

Mark J. Kilgard (mjk@nvidia.com)