---
name: "al_draw_prim"
section: "3alleg5"
platform: "linux"
package: "allegro5-doc"
version: "2:5.2.10.1+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/al_draw_prim/3alleg5"
---

# al\_draw\_prim(3alleg5)

Allegro 5 API

## NAME

al\_draw\_prim - Allegro 5 API

## SYNOPSIS

-

  ```
  #include <allegro5/allegro_primitives.h>
  int al_draw_prim(const void* vtxs, const ALLEGRO_VERTEX_DECL* decl,
     ALLEGRO_BITMAP* texture, int start, int end, int type)
  ```

## DESCRIPTION

Draws a subset of the passed vertex array.

*Parameters:*

- •

  texture - Texture to use, pass NULL to use only color shaded primitves

- •

  vtxs - Pointer to an array of vertices

- •

  decl - Pointer to a \[vertex declaration\]al\_create\_vertex\_decl(3alleg5). If set to NULL, the vertices are assumed to be of the ALLEGRO\_VERTEX(3alleg5) type

- •

  start - Start index of the subset of the vertex array to draw

- •

  end - One past the last index of the subset of the vertex array to draw

- •

  type - A member of the ALLEGRO\_PRIM\_TYPE(3alleg5) enumeration, specifying what kind of primitive to draw

*Returns:* Number of primitives drawn

For example to draw a textured triangle you could use:

-

  ```
  ALLEGRO_COLOR white = al_map_rgb_f(1, 1, 1);
  ALLEGRO_VERTEX v[] = {
     {.x = 128, .y = 0, .z = 0, .color = white, .u = 128, .v = 0},
     {.x = 0, .y = 256, .z = 0, .color = white, .u = 0, .v = 256},
     {.x = 256, .y = 256, .z = 0, .color = white, .u = 256, .v = 256}};
  al_draw_prim(v, NULL, texture, 0, 3, ALLEGRO_PRIM_TRIANGLE_LIST);
  ```

## SEE ALSO

ALLEGRO\_VERTEX(3alleg5), ALLEGRO\_PRIM\_TYPE(3alleg5), ALLEGRO\_VERTEX\_DECL(3alleg5), al\_draw\_indexed\_prim(3alleg5)