So I'm trying to make a simple 3D game in Allegro5 and I'm stuck trying to make the camera class work.
Here's my loop:
1al_clear_to_color(al_map_rgb(0,0,0));
2
3p = test.create_a5_perspective_transform();
4c = test.create_a5_camera_transform();
5
6al_use_projection_transform(&p);
7al_use_transform(&c);
8al_draw_prim(&test_hmap[0], NULL, NULL, 0, test_hmap.size(), ALLEGRO_PRIM_TRIANGLE_LIST);
9
10test.handle_mouse();
11al_flip_display();
and here are the 2 functions:
1ALLEGRO_TRANSFORM LPG_CAMERA::create_a5_perspective_transform()
2{
3 double pt_width = tan(h_fov/360.0*3.14159265358979)*lpg_default_near;
4 double pt_height= pt_width / double((double)al_get_display_width(lpg_a5_display)/(double)al_get_display_height(lpg_a5_display));
5 al_identity_transform(&th_output);
6 al_perspective_transform(&th_output,
7 -pt_width, pt_width, lpg_default_near,
8 -pt_height, pt_height, lpg_render_distance);
9 return th_output;
10}
11ALLEGRO_TRANSFORM LPG_CAMERA::create_a5_camera_transform()
12{
13 al_identity_transform(&th_output);
14 al_rotate_transform_3d(&th_output, -1.0, 0.0, 0.0, deg_to_rad(y_rot)); //pitch
15 al_rotate_transform_3d(&th_output, 0.0, -1.0, 0.0, deg_to_rad(x_rot)); //yaw
16 al_translate_transform_3d(&th_output, -x, -y, -z);
17 return th_output;
18}
The camera seems tilted and the FOV very limited (I attached the program to give you an idea), so I'm clearly doing something wrong here. I can't really see what's exactly causing the problem, though.
Does anyone know what's wrong?
EDIT: I'm an idiot, I looked at the documentation and realized I was passing arguments to al_perspective_transform in the wrong order 
Also, al_rotate_transform_3d() calls needed to be swapped. The camera is working perfectly now. I can't reply or delete this thread AFAIK, so I'm leaving it here