Initial revision

1 files changed, 347 insertions, 0 deletions

diff --git a/progs/xdemos/xdemo.c b/progs/xdemos/xdemo.c
new file mode 100644
index 00000000000..13facba8395
--- /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;
+}
+