glutils.ml

   1 let traw = Raw.create_static `float ~len:8;;
   2 let vraw = Raw.create_static `float ~len:8;;
   3
   4 let filledrect2 x0 y0 x1 y1 x2 y2 x3 y3 =
   5   Raw.sets_float vraw ~pos:0 [| x0; y0; x1; y1; x2; y2; x3; y3 |];
   6   GlArray.vertex `two vraw;
   7   GlArray.draw_arrays `triangle_strip ~first:0 ~count:4;
   8 ;;
   9
  10 let filledrect1 x0 y0 x1 y1 = filledrect2 x0 y0 x0 y1 x1 y0 x1 y1;;
  11
  12 let filledrect x0 y0 x1 y1 =
  13   GlArray.disable `texture_coord;
  14   filledrect1 x0 y0 x1 y1;
  15   GlArray.enable `texture_coord;
  16 ;;
  17
  18 let linerect x0 y0 x1 y1 =
  19   GlArray.disable `texture_coord;
  20   Raw.sets_float vraw ~pos:0 [| x0; y0; x0; y1; x1; y1; x1; y0 |];
  21   GlArray.vertex `two vraw;
  22   GlArray.draw_arrays `line_loop ~first:0 ~count:4;
  23   GlArray.enable `texture_coord;
  24 ;;
  25
  26 let drawstring size x y s =
  27   Gl.enable `blend;
  28   Gl.enable `texture_2d;
  29   GlFunc.blend_func ~src:`src_alpha ~dst:`one_minus_src_alpha;
  30   ignore (Ffi.drawstr size x y s);
  31   Gl.disable `blend;
  32   Gl.disable `texture_2d;
  33 ;;
  34
  35 let drawstring1 size x y s = Ffi.drawstr size x y s;;
  36 let drawstring2 size x y fmt =
  37   Printf.kprintf (drawstring size (x+1) (y+size+1)) fmt
  38 ;;
  39
  40 let makecheckers () =
  41   (* Based on lablGL-1.04/LablGlut/examples/lablGL/checker.ml which had
  42      following to say:
  43      converted by Issac Trotts.  July 25, 2002 *)
  44   let image = GlPix.create `ubyte ~format:`luminance ~width:2 ~height:2 in
  45   Raw.sets_string (GlPix.to_raw image) ~pos:0 "\255\200\200\255";
  46   let id = GlTex.gen_texture () in
  47   GlTex.bind_texture ~target:`texture_2d id;
  48   GlPix.store (`unpack_alignment 1);
  49   GlTex.image2d image;
  50   List.iter (GlTex.parameter ~target:`texture_2d)
  51             [ `mag_filter `nearest; `min_filter `nearest ];
  52   id;
  53 ;;
  54
  55 let redisplay = ref false;;
  56 let postRedisplay who =
  57   Utils.vlog "redisplay for [%S]" who;
  58   redisplay := true;
  59 ;;