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new xfont demo

tags/mesa_3_1
Brian Paul 25 years ago
parent
5b37c32274
commit
f1b45ca254
1 changed files with 172 additions and 111 deletions
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      progs/xdemos/xfont.c

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progs/xdemos/xfont.c View File

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/* $Id: xfont.c,v 1.2 1999/11/05 08:00:49 brianp Exp $ */

/*
* (c) Copyright 1993, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
* Mesa 3-D graphics library
*
* Copyright (C) 1999 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* US Government Users Restricted Rights
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/


/*
* xfont.c
* Draws some text in a bitmapped font. Uses glBitmap()
* and other pixel routines. Also demonstrates use of
* display lists.
* Example of using glXUseXFont().
* 5 November 1999
* Brian Paul
*/


#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glx.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "glaux.h"

GLuint base;

void makeRasterFont(void)
static const char *ProgramName = "xfont";

static const char *FontName = "fixed";

static GLuint FontBase = 0;



static void redraw( Display *dpy, Window w )
{
static const char *text = "This is glXUseXFont()";
printf("Redraw event\n");

glClear( GL_COLOR_BUFFER_BIT );

/* triangle */
glColor3f( 0.2, 0.2, 1.0 );
glBegin(GL_TRIANGLES);
glVertex2f( 0, 0.8 );
glVertex2f( -0.8, -0.7 );
glVertex2f( 0.8, -0.7 );
glEnd();

/* text */
glColor3f( 1, 1, 1 );
glRasterPos2f(-0.8, 0);
glListBase(FontBase);
glCallLists(strlen(text), GL_UNSIGNED_BYTE, (GLubyte *) text);

glXSwapBuffers( dpy, w );
}



static void resize( unsigned int width, unsigned int height )
{
printf("Resize event\n");
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
}



static void setup_font( Display *dpy )
{
XFontStruct *fontInfo;
Font id;
unsigned int first, last;
Display *xdisplay;

xdisplay = auxXDisplay ();
fontInfo = XLoadQueryFont(xdisplay,
"-adobe-helvetica-medium-r-normal--17-120-100-100-p-88-iso8859-1");
if (fontInfo == NULL) {
printf ("no font found\n");
exit (0);

fontInfo = XLoadQueryFont(dpy, FontName);
if (!fontInfo) {
printf("Error: font %s not found\n", FontName);
exit(0);
}

id = fontInfo->fid;
first = fontInfo->min_char_or_byte2;
last = fontInfo->max_char_or_byte2;

base = glGenLists((GLuint) last+1);
if (base == 0) {
printf ("out of display lists\n");
exit (0);
FontBase = glGenLists((GLuint) last + 1);
if (!FontBase) {
printf("Error: unable to allocate display lists\n");
exit(0);
}
glXUseXFont(id, first, last-first+1, base+first);
/* *height = fontInfo->ascent + fontInfo->descent;
*width = fontInfo->max_bounds.width; */
glXUseXFont(id, first, last - first + 1, FontBase + first);
}

void printString(char *s)
static Window make_rgb_db_window( Display *dpy, int xpos, int ypos,
unsigned int width, unsigned int height )
{
glPushAttrib (GL_LIST_BIT);
glListBase(base);
glCallLists(strlen(s), GL_UNSIGNED_BYTE, (GLubyte *)s);
glPopAttrib ();
}
int attrib[] = { GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DOUBLEBUFFER,
None };
int scrnum;
XSetWindowAttributes attr;
unsigned long mask;
Window root;
Window win;
GLXContext ctx;
XVisualInfo *visinfo;

void myinit (void)
{
makeRasterFont ();
glShadeModel (GL_FLAT);
}
scrnum = DefaultScreen( dpy );
root = RootWindow( dpy, scrnum );

void display(void)
{
GLfloat white[3] = { 1.0, 1.0, 1.0 };
int i, j;
char teststring[33];

glClear(GL_COLOR_BUFFER_BIT);
glColor3fv(white);
for (i = 32; i < 127; i += 32) {
glRasterPos2i(20, 200 - 18*(GLint) i/32);
for (j = 0; j < 32; j++)
teststring[j] = (char) (i+j);
teststring[32] = 0;
printString(teststring);
}
glRasterPos2i(20, 100);
printString("The quick brown fox jumps");
glRasterPos2i(20, 82);
printString("over a lazy dog.");
glFlush ();
visinfo = glXChooseVisual( dpy, scrnum, attrib );
if (!visinfo) {
printf("Error: couldn't get an RGB, Double-buffered visual\n");
exit(1);
}

/* window attributes */
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;

win = XCreateWindow( dpy, root, 0, 0, width, height,
0, visinfo->depth, InputOutput,
visinfo->visual, mask, &attr );

{
XSizeHints sizehints;
sizehints.x = xpos;
sizehints.y = ypos;
sizehints.width = width;
sizehints.height = height;
sizehints.flags = USSize | USPosition;
XSetNormalHints(dpy, win, &sizehints);
XSetStandardProperties(dpy, win, ProgramName, ProgramName,
None, (char **)NULL, 0, &sizehints);
}


ctx = glXCreateContext( dpy, visinfo, NULL, True );

glXMakeCurrent( dpy, win, ctx );

return win;
}

void myReshape(int w, int h)

static void event_loop( Display *dpy )
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho (0.0, (GLfloat) w, 0.0, (GLfloat) h, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
XEvent event;

while (1) {
XNextEvent( dpy, &event );

switch (event.type) {
case Expose:
redraw( dpy, event.xany.window );
break;
case ConfigureNotify:
resize( event.xconfigure.width, event.xconfigure.height );
break;
case KeyPress:
exit(0);
default:
; /* no-op */
}
}
}

/* Main Loop
* Open window with initial window size, title bar,
* RGBA display mode, and handle input events.
*/
int main(int argc, char** argv)


int main( int argc, char *argv[] )
{
auxInitDisplayMode (AUX_SINGLE | AUX_RGB);
auxInitPosition (0, 0, 500, 500);
if (!auxInitWindow (argv[0]))
auxQuit();
auxReshapeFunc (myReshape);
myinit ();
auxMainLoop(display);
return 0;
}
Display *dpy;
Window win;

dpy = XOpenDisplay(NULL);

win = make_rgb_db_window( dpy, 0, 0, 300, 300 );
setup_font( dpy );

glShadeModel( GL_FLAT );
glClearColor( 0.5, 0.5, 1.0, 1.0 );

XMapWindow( dpy, win );

event_loop( dpy );
return 0;
}

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