new xfont demo
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Brian Paul
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5b37c32274
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/* $Id: xfont.c,v 1.2 1999/11/05 08:00:49 brianp Exp $ */
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/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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* Mesa 3-D graphics library
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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* Copyright (C) 1999 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* xfont.c
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* Draws some text in a bitmapped font. Uses glBitmap()
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* and other pixel routines. Also demonstrates use of
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* display lists.
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* Example of using glXUseXFont().
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* 5 November 1999
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* Brian Paul
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*/
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <GL/glx.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "glaux.h"
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GLuint base;
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void makeRasterFont(void)
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static const char *ProgramName = "xfont";
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static const char *FontName = "fixed";
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static GLuint FontBase = 0;
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static void redraw( Display *dpy, Window w )
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{
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static const char *text = "This is glXUseXFont()";
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printf("Redraw event\n");
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glClear( GL_COLOR_BUFFER_BIT );
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/* triangle */
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glColor3f( 0.2, 0.2, 1.0 );
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glBegin(GL_TRIANGLES);
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glVertex2f( 0, 0.8 );
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glVertex2f( -0.8, -0.7 );
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glVertex2f( 0.8, -0.7 );
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glEnd();
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/* text */
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glColor3f( 1, 1, 1 );
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glRasterPos2f(-0.8, 0);
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glListBase(FontBase);
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glCallLists(strlen(text), GL_UNSIGNED_BYTE, (GLubyte *) text);
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glXSwapBuffers( dpy, w );
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}
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static void resize( unsigned int width, unsigned int height )
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{
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printf("Resize event\n");
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
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}
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static void setup_font( Display *dpy )
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{
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XFontStruct *fontInfo;
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Font id;
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unsigned int first, last;
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Display *xdisplay;
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xdisplay = auxXDisplay ();
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fontInfo = XLoadQueryFont(xdisplay,
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"-adobe-helvetica-medium-r-normal--17-120-100-100-p-88-iso8859-1");
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if (fontInfo == NULL) {
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printf ("no font found\n");
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exit (0);
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fontInfo = XLoadQueryFont(dpy, FontName);
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if (!fontInfo) {
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printf("Error: font %s not found\n", FontName);
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exit(0);
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}
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id = fontInfo->fid;
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first = fontInfo->min_char_or_byte2;
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last = fontInfo->max_char_or_byte2;
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base = glGenLists((GLuint) last+1);
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if (base == 0) {
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printf ("out of display lists\n");
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exit (0);
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FontBase = glGenLists((GLuint) last + 1);
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if (!FontBase) {
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printf("Error: unable to allocate display lists\n");
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exit(0);
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}
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glXUseXFont(id, first, last-first+1, base+first);
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/* *height = fontInfo->ascent + fontInfo->descent;
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*width = fontInfo->max_bounds.width; */
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glXUseXFont(id, first, last - first + 1, FontBase + first);
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}
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void printString(char *s)
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static Window make_rgb_db_window( Display *dpy, int xpos, int ypos,
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unsigned int width, unsigned int height )
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{
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glPushAttrib (GL_LIST_BIT);
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glListBase(base);
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glCallLists(strlen(s), GL_UNSIGNED_BYTE, (GLubyte *)s);
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glPopAttrib ();
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int attrib[] = { GLX_RGBA,
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GLX_RED_SIZE, 1,
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GLX_GREEN_SIZE, 1,
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GLX_BLUE_SIZE, 1,
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GLX_DOUBLEBUFFER,
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None };
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int scrnum;
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XSetWindowAttributes attr;
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unsigned long mask;
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Window root;
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Window win;
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GLXContext ctx;
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XVisualInfo *visinfo;
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scrnum = DefaultScreen( dpy );
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root = RootWindow( dpy, scrnum );
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visinfo = glXChooseVisual( dpy, scrnum, attrib );
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if (!visinfo) {
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printf("Error: couldn't get an RGB, Double-buffered visual\n");
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exit(1);
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}
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/* window attributes */
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attr.background_pixel = 0;
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attr.border_pixel = 0;
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attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
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attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
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mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
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win = XCreateWindow( dpy, root, 0, 0, width, height,
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0, visinfo->depth, InputOutput,
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visinfo->visual, mask, &attr );
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{
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XSizeHints sizehints;
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sizehints.x = xpos;
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sizehints.y = ypos;
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sizehints.width = width;
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sizehints.height = height;
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sizehints.flags = USSize | USPosition;
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XSetNormalHints(dpy, win, &sizehints);
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XSetStandardProperties(dpy, win, ProgramName, ProgramName,
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None, (char **)NULL, 0, &sizehints);
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}
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ctx = glXCreateContext( dpy, visinfo, NULL, True );
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glXMakeCurrent( dpy, win, ctx );
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return win;
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}
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void myinit (void)
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static void event_loop( Display *dpy )
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{
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makeRasterFont ();
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glShadeModel (GL_FLAT);
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XEvent event;
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while (1) {
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XNextEvent( dpy, &event );
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switch (event.type) {
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case Expose:
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redraw( dpy, event.xany.window );
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break;
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case ConfigureNotify:
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resize( event.xconfigure.width, event.xconfigure.height );
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break;
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case KeyPress:
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exit(0);
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default:
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; /* no-op */
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}
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}
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}
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void display(void)
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int main( int argc, char *argv[] )
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{
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GLfloat white[3] = { 1.0, 1.0, 1.0 };
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int i, j;
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char teststring[33];
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Display *dpy;
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Window win;
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glClear(GL_COLOR_BUFFER_BIT);
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glColor3fv(white);
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for (i = 32; i < 127; i += 32) {
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glRasterPos2i(20, 200 - 18*(GLint) i/32);
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for (j = 0; j < 32; j++)
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teststring[j] = (char) (i+j);
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teststring[32] = 0;
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printString(teststring);
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}
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glRasterPos2i(20, 100);
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printString("The quick brown fox jumps");
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glRasterPos2i(20, 82);
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printString("over a lazy dog.");
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glFlush ();
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dpy = XOpenDisplay(NULL);
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win = make_rgb_db_window( dpy, 0, 0, 300, 300 );
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setup_font( dpy );
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glShadeModel( GL_FLAT );
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glClearColor( 0.5, 0.5, 1.0, 1.0 );
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XMapWindow( dpy, win );
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event_loop( dpy );
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return 0;
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}
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void myReshape(int w, int h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho (0.0, (GLfloat) w, 0.0, (GLfloat) h, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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/* Main Loop
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* Open window with initial window size, title bar,
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* RGBA display mode, and handle input events.
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*/
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int main(int argc, char** argv)
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{
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auxInitDisplayMode (AUX_SINGLE | AUX_RGB);
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auxInitPosition (0, 0, 500, 500);
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if (!auxInitWindow (argv[0]))
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auxQuit();
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auxReshapeFunc (myReshape);
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myinit ();
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auxMainLoop(display);
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return 0;
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}
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