---
name: "request_scroll"
section: "3alleg4"
platform: "linux"
package: "allegro4-doc"
version: "2:4.4.3.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/request_scroll/3alleg4"
---

# request\_scroll(3alleg4)

Queues a hardware scroll request with triple buffering. Allegro game programming library.

## NAME

request\_scroll - Queues a hardware scroll request with triple buffering. Allegro game programming library.

## SYNOPSIS

**#include \<allegro.h\>**

**int request\_scroll(int x, int y);**

## DESCRIPTION

This function is used for triple buffering. It requests a hardware scroll  to the specified position, but returns immediately rather than waiting  for a retrace. The scroll will then take place during the next vertical  retrace, but you can carry on running other code in the meantime and use  the poll\_scroll() routine to detect when the flip has actually taken  place.

Triple buffering is only possible with certain drivers: you can look at the  GFX\_CAN\_TRIPLE\_BUFFER bit in the gfx\_capabilities flag to see if it will  work with the current driver.

## RETURN VALUE

This function returns zero on success, non-zero otherwise.

## SEE ALSO

**poll\_scroll**(3alleg4), **request\_video\_bitmap**(3alleg4), **gfx\_capabilities**(3alleg4), **scroll\_screen**(3alleg4)