Initial revision
diff --git a/progs/xdemos/xdemo.c b/progs/xdemos/xdemo.c
new file mode 100644
index 0000000..13facba
--- /dev/null
+++ b/progs/xdemos/xdemo.c
@@ -0,0 +1,347 @@
+/* $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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#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;
+}
+