/* * A demonstration of using the GLX functions. This program is in the * public domain. * * Brian Paul */ #include <GL/gl.h> #include <GL/glx.h> #include <stdio.h> #include <stdlib.h> static void redraw( Display *dpy, Window w ) { printf("Redraw event\n"); glClear( GL_COLOR_BUFFER_BIT ); glColor3f( 1.0, 1.0, 0.0 ); glRectf( -0.8, -0.8, 0.8, 0.8 ); 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 Window make_rgb_db_window( Display *dpy, 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; mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask; win = XCreateWindow( dpy, root, 0, 0, width, height, 0, visinfo->depth, InputOutput, visinfo->visual, mask, &attr ); ctx = glXCreateContext( dpy, visinfo, NULL, True ); if (!ctx) { printf("Error: glXCreateContext failed\n"); exit(1); } 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; } } } int main( int argc, char *argv[] ) { Display *dpy; Window win; dpy = XOpenDisplay(NULL); win = make_rgb_db_window( dpy, 300, 300 ); glShadeModel( GL_FLAT ); glClearColor( 0.5, 0.5, 0.5, 1.0 ); XMapWindow( dpy, win ); event_loop( dpy ); return 0; }