glutils.ml

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