/* * 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 glXUseXFont(). * 5 November 1999 * Brian Paul */ #include <GL/gl.h> #include <GL/glx.h> #include <stdio.h> #include <stdlib.h> #include <string.h> 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()"; 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 ) { 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; 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; FontBase = glGenLists((GLuint) last + 1); if (!FontBase) { printf("Error: unable to allocate display lists\n"); exit(0); } glXUseXFont(id, first, last - first + 1, FontBase + first); } 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; }