table of contents
al_draw_prim(3) | al_draw_prim(3) |
NAME¶
al_draw_prim - Allegro 5 API
SYNOPSIS¶
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#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:
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- texture - Texture to use, pass NULL to use only color shaded primitves
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- vtxs - Pointer to an array of vertices
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- 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
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- start - Start index of the subset of the vertex array to draw
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- end - One past the last index of the subset of the vertex array to draw
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- 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:
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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 |