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Man Pages


Manual Reference Pages  -  AL_DRAW_PRIM (3)

NAME

al_draw_prim - Allegro 5 API

CONTENTS

Synopsis
Description
See Also

SYNOPSIS

C]
#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 buffer.

I]Parameters:]
[bu] texture - Texture to use, pass 0 to use only color shaded primitves
[bu] vtxs - Pointer to an array of vertices
[bu] decl - Pointer to a vertex declaration. If set to NULL, the vertices are assumed to be of the ALLEGRO_VERTEX type
[bu] start - Start index of the subset of the vertex buffer to draw
[bu] end - One past the last index of subset of the vertex buffer to draw
[bu] type - A member of the ALLEGRO_PRIM_TYPE(3) enumeration, specifying what kind of primitive to draw
I]Returns:] Number of primitives drawn

For example to draw a textured triangle you could use:
C]
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(3), ALLEGRO_PRIM_TYPE(3), ALLEGRO_VERTEX_DECL(3), al_draw_indexed_prim(3)

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Allegro reference manual AL_DRAW_PRIM (3)

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