.\" Automatically generated by Pandoc 3.6.1
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.TH "al_lock_index_buffer" "3" "" "Allegro reference manual"
.SH NAME
al_lock_index_buffer \- Allegro 5 API
.SH SYNOPSIS
.IP
.EX
#include \f[B]<allegro5/allegro_primitives.h>\f[R]

void* al_lock_index_buffer(ALLEGRO_INDEX_BUFFER* buffer, int offset,
    int length, int flags)
.EE
.SH DESCRIPTION
Locks a index buffer so you can access its data.
Will return NULL if the parameters are invalid, if reading is requested
from a write only buffer and if the buffer is already locked.
.PP
\f[I]Parameters:\f[R]
.IP \[bu] 2
buffer \- Index buffer to lock
.IP \[bu] 2
offset \- Element index of the start of the locked range
.IP \[bu] 2
length \- How many indices to lock
.IP \[bu] 2
flags \- ALLEGRO_LOCK_READONLY, ALLEGRO_LOCK_WRITEONLY or
ALLEGRO_LOCK_READWRITE
.SH SINCE
5.1.8
.SH SEE ALSO
ALLEGRO_INDEX_BUFFER(3), al_unlock_index_buffer(3)