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Shoreline Blvd., Mountain View, CA 94039-7311. * * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. *) (* font.ml * * Draws some text in a bitmapped font. Uses glBitmap() * and other pixel routines. Also demonstrates use of * display lists. *) open GL open Glu open Glut let space = Bigarray.Array1.of_array Bigarray.int8_unsigned Bigarray.c_layout [| 0x00; 0x00; 0x00; 0x00; 0x00; 0x00; 0x00; 0x00; 0x00; 0x00; 0x00; 0x00; 0x00 |] let _letters = [| [| 0x00; 0x00; 0xc3; 0xc3; 0xc3; 0xc3; 0xff; 0xc3; 0xc3; 0xc3; 0x66; 0x3c; 0x18 |]; [| 0x00; 0x00; 0xfe; 0xc7; 0xc3; 0xc3; 0xc7; 0xfe; 0xc7; 0xc3; 0xc3; 0xc7; 0xfe |]; [| 0x00; 0x00; 0x7e; 0xe7; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xe7; 0x7e |]; [| 0x00; 0x00; 0xfc; 0xce; 0xc7; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc7; 0xce; 0xfc |]; [| 0x00; 0x00; 0xff; 0xc0; 0xc0; 0xc0; 0xc0; 0xfc; 0xc0; 0xc0; 0xc0; 0xc0; 0xff |]; [| 0x00; 0x00; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xfc; 0xc0; 0xc0; 0xc0; 0xff |]; [| 0x00; 0x00; 0x7e; 0xe7; 0xc3; 0xc3; 0xcf; 0xc0; 0xc0; 0xc0; 0xc0; 0xe7; 0x7e |]; [| 0x00; 0x00; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xff; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3 |]; [| 0x00; 0x00; 0x7e; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x7e |]; [| 0x00; 0x00; 0x7c; 0xee; 0xc6; 0x06; 0x06; 0x06; 0x06; 0x06; 0x06; 0x06; 0x06 |]; [| 0x00; 0x00; 0xc3; 0xc6; 0xcc; 0xd8; 0xf0; 0xe0; 0xf0; 0xd8; 0xcc; 0xc6; 0xc3 |]; [| 0x00; 0x00; 0xff; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0 |]; [| 0x00; 0x00; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xdb; 0xff; 0xff; 0xe7; 0xc3 |]; [| 0x00; 0x00; 0xc7; 0xc7; 0xcf; 0xcf; 0xdf; 0xdb; 0xfb; 0xf3; 0xf3; 0xe3; 0xe3 |]; [| 0x00; 0x00; 0x7e; 0xe7; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xe7; 0x7e |]; [| 0x00; 0x00; 0xc0; 0xc0; 0xc0; 0xc0; 0xc0; 0xfe; 0xc7; 0xc3; 0xc3; 0xc7; 0xfe |]; [| 0x00; 0x00; 0x3f; 0x6e; 0xdf; 0xdb; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0x66; 0x3c |]; [| 0x00; 0x00; 0xc3; 0xc6; 0xcc; 0xd8; 0xf0; 0xfe; 0xc7; 0xc3; 0xc3; 0xc7; 0xfe |]; [| 0x00; 0x00; 0x7e; 0xe7; 0x03; 0x03; 0x07; 0x7e; 0xe0; 0xc0; 0xc0; 0xe7; 0x7e |]; [| 0x00; 0x00; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0xff |]; [| 0x00; 0x00; 0x7e; 0xe7; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3 |]; [| 0x00; 0x00; 0x18; 0x3c; 0x3c; 0x66; 0x66; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3 |]; [| 0x00; 0x00; 0xc3; 0xe7; 0xff; 0xff; 0xdb; 0xdb; 0xc3; 0xc3; 0xc3; 0xc3; 0xc3 |]; [| 0x00; 0x00; 0xc3; 0x66; 0x66; 0x3c; 0x3c; 0x18; 0x3c; 0x3c; 0x66; 0x66; 0xc3 |]; [| 0x00; 0x00; 0x18; 0x18; 0x18; 0x18; 0x18; 0x18; 0x3c; 0x3c; 0x66; 0x66; 0xc3 |]; [| 0x00; 0x00; 0xff; 0xc0; 0xc0; 0x60; 0x30; 0x7e; 0x0c; 0x06; 0x03; 0x03; 0xff |]; |] let letters = Array.map (Bigarray.Array1.of_array Bigarray.int8_unsigned Bigarray.c_layout) _letters let fontOffset = ref 0 let makeRasterFont() = glPixelStorei GL_UNPACK_ALIGNMENT 1; fontOffset := glGenLists 128; let j = ref(int_of_char 'A') in for i = 0 to pred 26 do glNewList (!fontOffset + !j) GL_COMPILE; glBitmap 8 13 0.0 2.0 10.0 0.0 letters.(i); glEndList(); incr j; done; glNewList (!fontOffset + (int_of_char ' ')) GL_COMPILE; glBitmap 8 13 0.0 2.0 10.0 0.0 space; glEndList(); ;; let init() = glShadeModel GL_FLAT; makeRasterFont(); ;; (* convert a string to a char array *) let explode s = Array.init (String.length s) (fun i -> s.[i]) ;; let printString ~s = glPushAttrib [Attrib.GL_LIST_BIT]; glListBase !fontOffset; let s = explode s in glCallLists (Array.map (fun s -> int_of_char s) s); glPopAttrib (); ;; (* Everything above this line could be in a library * that defines a font. To make it work, you've got * to call makeRasterFont() before you start making * calls to printString(). *) let display() = let white = (1.0, 1.0, 1.0) in glClear [GL_COLOR_BUFFER_BIT]; glColor3v white; glRasterPos2i 20 60; printString "THE QUICK BROWN FOX JUMPS"; glRasterPos2i 20 40; printString "OVER A LAZY DOG"; glFlush (); ;; let reshape ~width:w ~height:h = glViewport 0 0 w h; glMatrixMode GL_PROJECTION; glLoadIdentity(); glOrtho 0.0 (float w) 0.0 (float h) (-1.0) (1.0); glMatrixMode GL_MODELVIEW; ;; (* ARGSUSED1 *) let keyboard ~key ~x ~y = match key with | '\027' -> exit(0); | _ -> () ;; (* Main Loop * Open window with initial window size, title bar, * RGBA display mode, and handle input events. *) let () = let _ = glutInit Sys.argv in glutInitDisplayMode [GLUT_SINGLE; GLUT_RGB]; glutInitWindowSize 300 100; glutInitWindowPosition 100 100; let _ = glutCreateWindow Sys.argv.(0) in init(); glutReshapeFunc ~reshape; glutKeyboardFunc ~keyboard; glutDisplayFunc ~display; glutMainLoop(); ;;