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/*
* 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.
*
* 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.
*/
/*
* Example of using glXUseRotatedXFontMESA().
* 24 Jan 2004
* Brian Paul
*/
#include <GL/gl.h>
#include <GL/glx.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xuserotfont.h"
static const char *ProgramName = "xfont";
static const char *FontName = "fixed";
static GLuint FontBase[4];
static void redraw( Display *dpy, Window w )
{
static const char *text = " Rotated bitmap text";
int i;
glClear( GL_COLOR_BUFFER_BIT );
/* triangle */
glColor3f( 0.2, 0.2, 1.0 );
glBegin(GL_TRIANGLES);
glVertex2f( -0.8, 0.7 );
glVertex2f( -0.8, -0.7 );
glVertex2f( 0.8, 0.0 );
glEnd();
/* marker */
glColor3f( 0, 1, 0 );
glBegin(GL_POINTS);
glVertex2f(0, 0);
glEnd();
/* text */
glColor3f( 1, 1, 1 );
for (i = 0; i < 4; i++) {
glRasterPos2f(0, 0);
glListBase(FontBase[i]);
glCallLists(strlen(text), GL_UNSIGNED_BYTE, (GLubyte *) text);
}
glXSwapBuffers( dpy, w );
}
static void resize( unsigned int width, unsigned int height )
{
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;
int i;
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;
for (i = 0; i < 4; i++) {
FontBase[i] = glGenLists((GLuint) last + 1);
if (!FontBase[i]) {
printf("Error: unable to allocate display lists\n");
exit(0);
}
glXUseRotatedXFontMESA(id, first, last - first + 1, FontBase[i] + first,
i * 90);
}
}
static Window make_rgb_db_window( Display *dpy, int xpos, int ypos,
unsigned int width, unsigned int height )
{
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;
scrnum = DefaultScreen( dpy );
root = RootWindow( dpy, scrnum );
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;
}
static void event_loop( Display *dpy )
{
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 */
}
}
}
int main( int argc, char *argv[] )
{
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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