Record ALLEGRO_VERTEX_ELEMENT

Unit

al5primitives

Declaration

type ALLEGRO_VERTEX_ELEMENT = record

Description

A small structure describing a certain element of a vertex. E.g. the position of the vertex, or its color. These structures are used by the al_create_vertex_decl function to create the vertex declaration. For that they generally occur in an array. The last element of such an array should have the attribute field equal to 0, to signify that it is the end of the array. Here is an example code that would create a declaration describing the ALLEGRO_VERTEX structure (passing this as vertex declaration to al_draw_prim would be identical to passing Nil):

CONST
  Elements: ARRAY [0..1] OF ALLEGRO_VERTEX_ELEMENT = (
    (attribute: ALLEGRO_PRIM_POSITION,        storage: ALLEGRO_PRIM_FLOAT_3,      offset: 0),
    (attribute: ALLEGRO_PRIM_TEX_COORD_PIXEL, storage: ALLEGRO_PRIM_FLOAT_2,      offset: SIZEOF (AL_FLOAT) * 3),
    (attribute: ALLEGRO_PRIM_COLOR_ATTR,      storage: ALLEGRO_PRIM_STORAGE_NONE, offset: SIZEOF (AL_FLOAT) * 5),
    (attribute: ALLEGRO_PRIM_ATTR_NONE,       storage: ALLEGRO_PRIM_STORAGE_NONE, offset: 0)
  );
  Declaration: ALLEGRO_VERTEX_DECLptr;
BEGIN
  Declaration := al_create_vertex_decl (Elements, SIZEOF (ALLEGRO_VERTEX));

See also

al_create_vertex_decl

Creates a vertex declaration, which describes a custom vertex format.

ALLEGRO_VERTEX_DECLptr

A vertex declaration.

ALLEGRO_PRIM_ATTR

Enumerates the types of vertex attributes that a custom vertex may have.

ALLEGRO_PRIM_STORAGE

Enumerates the types of storage an attribute of a custom vertex may be stored in.

Overview

Fields

Description

Fields