/* $Id: xdemo.c,v 1.1 1999/08/19 00:55:43 jtg Exp $ */ /* * Very simple demo of how to use the Mesa/X11 interface instead of the * glx, tk or aux toolkits. I highly recommend using the GLX interface * instead of the X/Mesa interface, however. * * This program is in the public domain. * * Brian Paul */ /* * $Log: xdemo.c,v $ * Revision 1.1 1999/08/19 00:55:43 jtg * Initial revision * * Revision 3.0 1998/02/21 02:16:54 brianp * initial rev * */ #include #include #include #include #include #include "GL/xmesa.h" #include "GL/gl.h" static GLint Black, Red, Green, Blue; static void make_window( char *title, int color_flag ) { int x = 10, y = 10, width = 400, height = 300; Display *dpy; int scr; Window root, win; Colormap cmap; XColor xcolor; int attr_flags; XVisualInfo *visinfo; XSetWindowAttributes attr; XTextProperty tp; XSizeHints sh; XEvent e; XMesaContext context; XMesaVisual visual; XMesaBuffer buffer; /* * Do the usual X things to make a window. */ dpy = XOpenDisplay(NULL); if (!dpy) { printf("Couldn't open default display!\n"); exit(1); } scr = DefaultScreen(dpy); root = RootWindow(dpy, scr); /* alloc visinfo struct */ visinfo = (XVisualInfo *) malloc( sizeof(XVisualInfo) ); /* Get a visual and colormap */ if (color_flag) { /* Open TrueColor window */ /* if (!XMatchVisualInfo( dpy, scr, 24, TrueColor, visinfo )) { printf("Couldn't get 24-bit TrueColor visual!\n"); exit(1); } */ if (!XMatchVisualInfo( dpy, scr, 8, PseudoColor, visinfo )) { printf("Couldn't get 8-bit PseudoColor visual!\n"); exit(1); } cmap = XCreateColormap( dpy, root, visinfo->visual, AllocNone ); Black = Red = Green = Blue = 0; } else { /* Open color index window */ if (!XMatchVisualInfo( dpy, scr, 8, PseudoColor, visinfo )) { printf("Couldn't get 8-bit PseudoColor visual\n"); exit(1); } cmap = XCreateColormap( dpy, root, visinfo->visual, AllocNone ); /* Allocate colors */ xcolor.red = 0x0; xcolor.green = 0x0; xcolor.blue = 0x0; xcolor.flags = DoRed | DoGreen | DoBlue; if (!XAllocColor( dpy, cmap, &xcolor )) { printf("Couldn't allocate black!\n"); exit(1); } Black = xcolor.pixel; xcolor.red = 0xffff; xcolor.green = 0x0; xcolor.blue = 0x0; xcolor.flags = DoRed | DoGreen | DoBlue; if (!XAllocColor( dpy, cmap, &xcolor )) { printf("Couldn't allocate red!\n"); exit(1); } Red = xcolor.pixel; xcolor.red = 0x0; xcolor.green = 0xffff; xcolor.blue = 0x0; xcolor.flags = DoRed | DoGreen | DoBlue; if (!XAllocColor( dpy, cmap, &xcolor )) { printf("Couldn't allocate green!\n"); exit(1); } Green = xcolor.pixel; xcolor.red = 0x0; xcolor.green = 0x0; xcolor.blue = 0xffff; xcolor.flags = DoRed | DoGreen | DoBlue; if (!XAllocColor( dpy, cmap, &xcolor )) { printf("Couldn't allocate blue!\n"); exit(1); } Blue = xcolor.pixel; } /* set window attributes */ attr.colormap = cmap; attr.event_mask = ExposureMask | StructureNotifyMask; attr.border_pixel = BlackPixel( dpy, scr ); attr.background_pixel = BlackPixel( dpy, scr ); attr_flags = CWColormap | CWEventMask | CWBorderPixel | CWBackPixel; /* Create the window */ win = XCreateWindow( dpy, root, x,y, width, height, 0, visinfo->depth, InputOutput, visinfo->visual, attr_flags, &attr); if (!win) { printf("Couldn't open window!\n"); exit(1); } XStringListToTextProperty(&title, 1, &tp); sh.flags = USPosition | USSize; XSetWMProperties(dpy, win, &tp, &tp, 0, 0, &sh, 0, 0); XMapWindow(dpy, win); while (1) { XNextEvent( dpy, &e ); if (e.type == MapNotify && e.xmap.window == win) { break; } } /* * Now do the special Mesa/Xlib stuff! */ visual = XMesaCreateVisual( dpy, visinfo, (GLboolean) color_flag, GL_FALSE, /* alpha_flag */ GL_FALSE, /* db_flag */ GL_FALSE, /* stereo flag */ GL_FALSE, /* ximage_flag */ 0, /* depth size */ 0, /* stencil size */ 0, /* accum_size */ 0 /* level */ ); if (!visual) { printf("Couldn't create Mesa/X visual!\n"); exit(1); } /* Create a Mesa rendering context */ context = XMesaCreateContext( visual, NULL /* share_list */ ); if (!context) { printf("Couldn't create Mesa/X context!\n"); exit(1); } buffer = XMesaCreateWindowBuffer( visual, win ); if (!buffer) { printf("Couldn't create Mesa/X buffer!\n"); exit(1); } XMesaMakeCurrent( context, buffer ); /* Ready to render! */ } static void draw_cube( void ) { /* X faces */ glIndexi( Red ); glColor3f( 1.0, 0.0, 0.0 ); glBegin( GL_POLYGON ); glVertex3f( 1.0, 1.0, 1.0 ); glVertex3f( 1.0, -1.0, 1.0 ); glVertex3f( 1.0, -1.0, -1.0 ); glVertex3f( 1.0, 1.0, -1.0 ); glEnd(); glBegin( GL_POLYGON ); glVertex3f( -1.0, 1.0, 1.0 ); glVertex3f( -1.0, 1.0, -1.0 ); glVertex3f( -1.0, -1.0, -1.0 ); glVertex3f( -1.0, -1.0, 1.0 ); glEnd(); /* Y faces */ glIndexi( Green ); glColor3f( 0.0, 1.0, 0.0 ); glBegin( GL_POLYGON ); glVertex3f( 1.0, 1.0, 1.0 ); glVertex3f( 1.0, 1.0, -1.0 ); glVertex3f( -1.0, 1.0, -1.0 ); glVertex3f( -1.0, 1.0, 1.0 ); glEnd(); glBegin( GL_POLYGON ); glVertex3f( 1.0, -1.0, 1.0 ); glVertex3f( -1.0, -1.0, 1.0 ); glVertex3f( -1.0, -1.0, -1.0 ); glVertex3f( 1.0, -1.0, -1.0 ); glEnd(); /* Z faces */ glIndexi( Blue ); glColor3f( 0.0, 0.0, 1.0 ); glBegin( GL_POLYGON ); glVertex3f( 1.0, 1.0, 1.0 ); glVertex3f( -1.0, 1.0, 1.0 ); glVertex3f( -1.0, -1.0, 1.0 ); glVertex3f( 1.0, -1.0, 1.0 ); glEnd(); glBegin( GL_POLYGON ); glVertex3f( 1.0, 1.0, -1.0 ); glVertex3f( 1.0,-1.0, -1.0 ); glVertex3f( -1.0,-1.0, -1.0 ); glVertex3f( -1.0, 1.0, -1.0 ); glEnd(); } static void display_loop( void ) { GLfloat xrot, yrot, zrot; xrot = yrot = zrot = 0.0; glClearColor( 0.0, 0.0, 0.0, 0.0 ); glClearIndex( Black ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glFrustum( -1.0, 1.0, -1.0, 1.0, 1.0, 10.0 ); glTranslatef( 0.0, 0.0, -5.0 ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glCullFace( GL_BACK ); glEnable( GL_CULL_FACE ); glShadeModel( GL_FLAT ); while (1) { glClear( GL_COLOR_BUFFER_BIT ); glPushMatrix(); glRotatef( xrot, 1.0, 0.0, 0.0 ); glRotatef( yrot, 0.0, 1.0, 0.0 ); glRotatef( zrot, 0.0, 0.0, 1.0 ); draw_cube(); glPopMatrix(); glFinish(); xrot += 10.0; yrot += 7.0; zrot -= 3.0; } } int main( int argc, char *argv[] ) { int mode = 0; if (argc >= 2) { if (strcmp(argv[1],"-ci")==0) mode = 0; else if (strcmp(argv[1],"-rgb")==0) mode = 1; else { printf("Bad flag: %s\n", argv[1]); printf("Specify -ci for 8-bit color index or -rgb for RGB mode\n"); exit(1); } } else { printf("Specify -ci for 8-bit color index or -rgb for RGB mode\n"); printf("Defaulting to 8-bit color index\n"); } make_window( argv[0], mode ); display_loop(); return 0; }