Source file renderinit.ml

let () = Debug.print "* Loading renderinit"

(* initialisations liées aux sorties graphiques et à la boucle de rendu *)

open Tsdl
open Common
open Oplotdef

let window_open = ref false
let interrupt_request = ref false
let fullscreen = ref false
let multisampling = ref true
let gl_scale = ref 2.

(* user aliases *)
let graphics = GRAPHICS_d
and gl = GL_d
and fig = FIG_d
and xfig = XFIG_d
and eps = EPS_d
and pdf = PDF_d
and gv = GV_d
and bmp = BMP_d
and png = PNG_d
and img = IMG_d

let default_device = ref GL
let default_user_device = ref GL_d

(*** interactif: choix de la sortie graphique ***)
let set_device devname =
  default_user_device := devname;
  default_device :=
    List.assoc devname
      [
        (GRAPHICS_d, GRAPHICS);
        (GL_d, GL);
        (FIG_d, FIG);
        (XFIG_d, FIG);
        (EPS_d, FIG);
        (GV_d, FIG);
        (BMP_d, GL);
        (PNG_d, GL);
        (IMG_d, GL);
      ]

(* gestionnaires opengl autorisés *)
type gl_handler = SDL | GLUT | GTK

let default_gl = ref SDL
let set_default_gl x = default_gl := x

(* w et h comprennent les marges *)
let resize_window w h =
  let w, h =
    ( max (w - !left_margin - !right_margin) 5,
      max (h - !top_margin - !bottom_margin) 5 )
  in
  window_width := w;
  fwindow_width := float w;
  window_height := h;
  fwindow_height := float h

(* pour tourner les objets 3D indépendemment des objets 2D: *)
(* position en représentation quaternion *)
let default_position3d = (1., 0., 0., 0.)
let position3d = ref default_position3d

(* coeff multiplicatif *)
let default_zoom3d = 1.
let zoom3d = ref default_zoom3d
let mouse_x = ref 0
let mouse_y = ref 0
let frame_length = ref (1000 / 29) (* 29 FPS *)
let get_frame_length () = !frame_length
let set_frame_length x = frame_length := x
let start_time = ref 0

(* utilisé pour réguler l'affichage dans les boucles principales *)

let initial_time = ref 0

(* pour geler le temps pendant les freezes *)
let time_delay = ref 0
let counter = ref 0

(* numero de l'objet courant. On utilise deux numéros pour un objet
   axis. Ca permet de séparer le texte des axes *)

let get_depth dep : int =
  match dep with None -> max 0 (900 - !counter) | Some d -> d

let wait = Pause 0

(* s'utilise pour attendre la frappe d'une touche *)
(* revoir le fonctionnement des pauses ! *)
let resume_pause = ref false

(* used to escape from paused *)
let pause_time : int option ref = ref None
let do_not_draw = ref false

(* used to stop drawing at some point *)
(* use an exception instead ? *)

let pause_pass = ref 0

(* how many objects to bypass before pausing *)
(* redondantes variables ? *)

let pause_init () =
  pause_time := None;
  resume_pause := false;
  do_not_draw := false;
  pause_pass := 0

let default_color = blue
let default_bg_color = ref white
let clear = Clear !default_bg_color

(*inutilisé ?*)

(* la plupart du temps le système graphique se souvient de la dernière couleur
   utilisée, mais parfois on a besoin de la modifier momentanément, et donc de
   s'en souvenir *)
let current_color = ref blue
let text_color = ref red

(* fournit le triplet correspondant *)
let float_of_color c = (c.r, c.g, c.b)

(* fournit un triplet d'entiers rvb de 0 à 255 *)
let int_of_color c =
  ( int_of_float (c.r *. 255.),
    int_of_float (c.g *. 255.),
    int_of_float (c.b *. 255.) )

let rgb_of_color c =
  let r, g, b = int_of_color c in
  (r lsl 16) + (g lsl 8) + b

let opaque c =
  let r, g, b = int_of_color c in
  (r, g, b, 255)

let sdl_color (r, g, b, a) = Sdl.Color.create ~r ~g ~b ~a

(* faire un tableau array pour les 5?? couleurs *)
let fig_colors = Array.make 543 0

let init_fig_colors () =
  Array.fill fig_colors 0 543 0;
  let rec loop i l =
    match l with
    | [] -> ()
    | c :: ll ->
        fig_colors.(i) <- c;
        loop (i + 1) ll
  in
  loop 0
    [
      0x000000;
      (* black *)
      0x0000ff;
      (* blue *)
      0x00ff00;
      (* green *)
      0x00ffff;
      (* cyan *)
      0xff0000;
      (* red *)
      0xff00ff;
      (* magenta *)
      0xffff00;
      (* yellow *)
      0xffffff;
      (* white *)
      0x000090;
      0x0000b0;
      0x0000d0;
      0x87ceff;
      0x009000;
      0x00b000;
      0x00d000;
      0x009090;
      0x00b0b0;
      0x00d0d0;
      0x900000;
      0xb00000;
      0xd00000;
      0x900090;
      0xb000b0;
      0xd000d0;
      0x803000;
      0xa04000;
      0xc06000;
      0xff8080;
      0xffa0a0;
      0xffc0c0;
      0xffe0e0;
      0xffd700;
    ]

(* trouve l'indice de la première occurence d'un element dans un tableau . Sinon
   retourne -1 *)
let mem array (elem : int) =
  let l = Array.length array in
  let rec loop i =
    if i = l then -1 else if array.(i) = elem then i else loop (i + 1)
  in
  loop 0

let fig_of_color c = mem fig_colors (rgb_of_color c)
let pr = Printf.printf
let map_option f = function Some x -> Some (f x) | None -> None

(* first line of output from the shell command *)
let string_of_process command =
  let proc = Unix.open_process_in command in
  try
    let res = input_line proc in
    match Unix.close_process_in proc with
    | Unix.WEXITED 0 -> Some res
    | Unix.WEXITED e ->
        Debug.print "Command %s exited with error %u" command e;
        None
    | _ ->
        Debug.print "Command %s exited with some error" command;
        None
  with End_of_file ->
    Debug.print "Command %s has no output" command;
    None

(* try to obtain the monitor's DPI on linux systems. Does not work with multiple
   monitors *)
let get_pixel_height_from_xrandr () =
  let line =
    string_of_process
      "xrandr | grep \"connected primary\" | grep -E \"[0-9]+x[0-9]+\" -o"
  in
  try
    line
    |> map_option (fun res ->
        let i = String.index res 'x' in
        String.sub res (i + 1) (String.length res - i - 1) |> int_of_string)
  with _ ->
    Debug.print
      "get_pixel_height_from_xrandr: cannot parse output of xrandr (%s)"
      (match line with None -> "none" | Some s -> s);
    None

let get_device_height_from_xrandr () =
  let line =
    string_of_process "xrandr | awk '/connected primary/ {print $NF}'"
  in
  try
    line
    |> map_option (fun res ->
        let i = String.index res 'm' in
        String.sub res 0 i |> int_of_string)
  with _ ->
    Debug.print
      "get_device_height_from_xrandr: cannot parse output of xrandr (%s)"
      (match line with None -> "none" | Some s -> s);
    None

let get_dpi_from_xrandr () =
  match (get_device_height_from_xrandr (), get_pixel_height_from_xrandr ()) with
  | None, _ -> None
  | _, None -> None
  | Some m, Some p ->
      let dpi = float p /. (float m /. 25.4) |> int_of_float in
      Some dpi

let get_dpi_from_xdpyinfo () =
  let line =
    string_of_process "xdpyinfo | grep resolution | awk '{print $2}'"
  in
  try
    line
    |> map_option (fun res ->
        let i = String.index res 'x' in
        int_of_string (String.sub res 0 i))
  with _ ->
    Debug.print "get_dpi_from_xdpyinfo: cannot parse output of xpdyinfo (%s)"
      (match line with None -> "none" | Some s -> s);
    None

let get_dpi () =
  match (get_dpi_from_xdpyinfo (), get_dpi_from_xrandr ()) with
  | None, None -> None
  | Some dpi, None | None, Some dpi -> Some dpi
  | Some d1, Some d2 ->
      if abs (d1 - d2) > 5 then begin
        Debug.print
          "xrandr and xdpyinfo do not return the same dpi: %u != %u. Choosing \
           the smaller."
          d2 d1;
        Some (min d1 d2)
      end
      else Some d2

let init () =
  Debug.print "init";
  let default_dpi = 110 in
  let dpi =
    match get_dpi () with
    | Some x ->
        Debug.print "Detected DPI=%u\n" x;
        x
    | None ->
        Debug.print "Cannot get monitor's DPI. Using %u." default_dpi;
        default_dpi
  in
  let s = if dpi <= 110 then 1. else float dpi /. 110. in
  Debug.print "Using SCALE=%f\n" s;
  gl_scale := s;
  window_open := false;
  fullscreen := false;
  multisampling := true;
  interrupt_request := false;
  default_device := GL;
  default_user_device := GL_d;
  default_gl := SDL;
  position3d := default_position3d;
  zoom3d := default_zoom3d;
  mouse_x := 0;
  mouse_y := 0;
  frame_length := 1000 / 29;
  start_time := 0;
  initial_time := 0;
  time_delay := 0;
  counter := 0;
  default_bg_color := white;
  current_color := blue;
  pause_init ();
  reset_view3 ()

(* pas néc ? cf disp *)

let get_mouse_x () = !mouse_x
let get_mouse_y () = !mouse_y
let set_mouse_x x = mouse_x := x
let set_mouse_y y = mouse_y := y
let get_window_height () = !Oplotdef.window_height
let () = init ()