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.TH "al_have_opengl_extension" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_have_opengl_extension - Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include <allegro5/allegro_opengl.h>

bool al_have_opengl_extension(const char *extension)
\f[R]
.fi
.SH DESCRIPTION
.PP
This function is a helper to determine whether an OpenGL extension is
available on the given display or not.
.PP
Example:
.IP
.nf
\f[C]
bool packedpixels = al_have_opengl_extension(\[dq]GL_EXT_packed_pixels\[dq]);
\f[R]
.fi
.PP
If \f[I]packedpixels\f[R] is true then you can safely use the constants
related to the packed pixels extension.
.PP
Returns true if the extension is available; false otherwise.