Initial revision
diff --git a/progs/xdemos/glxpixmap.c b/progs/xdemos/glxpixmap.c
new file mode 100644
index 0000000..e4a62c7
--- /dev/null
+++ b/progs/xdemos/glxpixmap.c
@@ -0,0 +1,160 @@
+/* $Id: glxpixmap.c,v 1.1 1999/08/19 00:55:43 jtg Exp $ */
+
+
+/*
+ * A demonstration of using the GLXPixmap functions. This program is in
+ * the public domain.
+ *
+ * Brian Paul
+ */
+
+
+/*
+ * $Id: glxpixmap.c,v 1.1 1999/08/19 00:55:43 jtg Exp $
+ */
+
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+
+static GLXContext ctx;
+static XVisualInfo *visinfo;
+static GC gc;
+
+
+
+static Window make_rgb_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,
+ None };
+ int scrnum;
+ XSetWindowAttributes attr;
+ unsigned long mask;
+ Window root;
+ Window win;
+
+ 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;
+ /* TODO: share root colormap if possible */
+ 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 );
+
+ /* make an X GC so we can do XCopyArea later */
+ gc = XCreateGC( dpy, win, 0, NULL );
+
+ ctx = glXCreateContext( dpy, visinfo, NULL, True );
+
+ return win;
+}
+
+
+static GLXPixmap make_pixmap( Display *dpy, Window win,
+ unsigned int width, unsigned int height )
+{
+ Pixmap pm;
+ GLXPixmap glxpm;
+ XWindowAttributes attr;
+
+ pm = XCreatePixmap( dpy, win, width, height, visinfo->depth );
+ XGetWindowAttributes( dpy, win, &attr );
+
+ /*
+ * IMPORTANT:
+ * Use the glXCreateGLXPixmapMESA funtion when using Mesa because
+ * Mesa needs to know the colormap associated with a pixmap in order
+ * to render correctly. This is because Mesa allows RGB rendering
+ * into any kind of visual, not just TrueColor or DirectColor.
+ */
+#ifdef GLX_MESA_pixmap_colormap
+ glxpm = glXCreateGLXPixmapMESA( dpy, visinfo, pm, attr.colormap );
+#else
+ /* This will work with Mesa too if the visual is TrueColor or DirectColor */
+ glxpm = glXCreateGLXPixmap( dpy, visinfo, pm );
+#endif
+
+ return glxpm;
+}
+
+
+
+static void event_loop( Display *dpy, GLXPixmap pm )
+{
+ XEvent event;
+
+ while (1) {
+ XNextEvent( dpy, &event );
+
+ switch (event.type) {
+ case Expose:
+ printf("Redraw\n");
+ /* copy the image from GLXPixmap to window */
+ XCopyArea( dpy, pm, event.xany.window, /* src, dest */
+ gc, 0, 0, 300, 300, /* gc, src pos, size */
+ 0, 0 ); /* dest pos */
+ break;
+ case ConfigureNotify:
+ /* nothing */
+ break;
+ }
+ }
+}
+
+
+
+int main( int argc, char *argv[] )
+{
+ Display *dpy;
+ Window win;
+ GLXPixmap pm;
+
+ dpy = XOpenDisplay(NULL);
+
+ win = make_rgb_window( dpy, 300, 300 );
+ pm = make_pixmap( dpy, win, 300, 300 );
+
+#ifdef JUNK
+ glXMakeCurrent( dpy, win, ctx ); /*to make sure ctx is properly initialized*/
+#endif
+
+ glXMakeCurrent( dpy, pm, ctx );
+
+ /* Render an image into the pixmap */
+ glShadeModel( GL_FLAT );
+ glClearColor( 0.5, 0.5, 0.5, 1.0 );
+ glClear( GL_COLOR_BUFFER_BIT );
+ glViewport( 0, 0, 300, 300 );
+ glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
+ glColor3f( 0.0, 1.0, 1.0 );
+ glRectf( -0.75, -0.75, 0.75, 0.75 );
+ glFlush();
+
+ /* when a redraw is needed we'll just copy the pixmap image to the window */
+
+ XMapWindow( dpy, win );
+
+ event_loop( dpy, pm );
+ return 0;
+}