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al_draw_prim(3) Library Functions Manual al_draw_prim(3) 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 prim- itves • vtxs - Pointer to an array of vertices • decl - Pointer to a [vertex declaration]al_create_vertex_decl(3). If set to NULL, the vertices are assumed to be of the ALLEGRO_VERTEX(3) 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(3) 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(3), ALLEGRO_PRIM_TYPE(3), ALLEGRO_VERTEX_DECL(3), al_draw_indexed_prim(3) Allegro reference manual al_draw_prim(3)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO
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