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al_lock_vertex_buffer(3)   Library Functions Manual   al_lock_vertex_buffer(3)

NAME
       al_lock_vertex_buffer - Allegro 5 API

SYNOPSIS
	      #include <allegro5/allegro_primitives.h>

	      void* al_lock_vertex_buffer(ALLEGRO_VERTEX_BUFFER* buffer, int offset,
		 int length, int flags)

DESCRIPTION
       Locks  a	vertex buffer so you can access	its data.  Will	return NULL if
       the parameters are invalid, if reading is requested from	a  write  only
       buffer, or if the buffer	is already locked.

       Parameters:

       • buffer	- Vertex buffer	to lock

       • offset	- Vertex index of the start of the locked range

       • length	- How many vertices to lock

       • flags	 -   ALLEGRO_LOCK_READONLY,  ALLEGRO_LOCK_WRITEONLY  or	 ALLE-
	 GRO_LOCK_READWRITE

SINCE
       5.1.3

SEE ALSO
       ALLEGRO_VERTEX_BUFFER(3), al_unlock_vertex_buffer(3)

Allegro	reference manual			      al_lock_vertex_buffer(3)

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