diff --git a/defs.mak b/defs.mak
index 7c95e6a0..07220479 100644
--- a/defs.mak
+++ b/defs.mak
@@ -61,14 +61,14 @@ LIB_SPECS	       =  -L/usr/lib64 -ltk8.6 -L/usr/lib64 -ltcl8.6
 WISH_EXE	       = /usr/bin/wish
 TCL_LIB_DIR	       = /usr/lib
 MAGIC_VERSION	       = 8.2
-MAGIC_REVISION	       = 27
+MAGIC_REVISION	       = 29
 
 CC                     = gcc
 CPP                    = gcc -E
 CXX		       = g++
 
 CPPFLAGS               = -I. -I${MAGICDIR} 
-DFLAGS                 =  -DCAD_DIR=\"${LIBDIR}\" -DBIN_DIR=\"${BINDIR}\" -DTCL_DIR=\"${TCLDIR}\" -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DMAGIC_VERSION=\"8.2\" -DMAGIC_REVISION=\"27\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DSIZEOF_VOID_P=8 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_UNSIGNED_LONG_LONG=8 -DSTDC_HEADERS=1 -DHAVE_SETENV=1 -DHAVE_PUTENV=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_DIRENT_H=1 -DHAVE_LIMITS_H=1 -DHAVE_PATHS_H=1 -DHAVE_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DX11_BACKING_STORE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -DUSE_NEW_MACROS=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DCAIRO_OFFSCREEN_RENDER=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux=1 -DSYSV=1 -DISC=1 -DNDEBUG -DGCORE=\"/bin/gcore\"
+DFLAGS                 =  -DCAD_DIR=\"${LIBDIR}\" -DBIN_DIR=\"${BINDIR}\" -DTCL_DIR=\"${TCLDIR}\" -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DMAGIC_VERSION=\"8.2\" -DMAGIC_REVISION=\"29\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DSIZEOF_VOID_P=8 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_UNSIGNED_LONG_LONG=8 -DSTDC_HEADERS=1 -DHAVE_SETENV=1 -DHAVE_PUTENV=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_DIRENT_H=1 -DHAVE_LIMITS_H=1 -DHAVE_PATHS_H=1 -DHAVE_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -DUSE_NEW_MACROS=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux=1 -DSYSV=1 -DISC=1 -DNDEBUG -DGCORE=\"/bin/gcore\"
 DFLAGS		      += -DSHDLIB_EXT=\".so\"
 CFLAGS                 = -g -m64 -fPIC -Wimplicit-int -fPIC 
 
diff --git a/graphics/grOGL1.c b/graphics/grOGL1.c
index 7488372b..ec856bb2 100644
--- a/graphics/grOGL1.c
+++ b/graphics/grOGL1.c
@@ -562,7 +562,9 @@ pipehandler()
 	if (mw->w_backingStore != (ClientData)NULL)
 	{
 	    Rect surface;
+	    (*GrLockPtr)(mw, FALSE);
 	    (*GrGetBackingStorePtr)(mw, &screenRect);
+	    (*GrUnlockPtr)(mw);
 	    WindScreenToSurface(mw, &screenRect, &surface);
 	    DBWHLRedrawPrepWindow(mw, &surface);
 	    WindDrawBorder(mw, &screenRect);
diff --git a/graphics/grTCairo1.c b/graphics/grTCairo1.c
index f0311a7b..5435a1c8 100644
--- a/graphics/grTCairo1.c
+++ b/graphics/grTCairo1.c
@@ -816,7 +816,9 @@ keys_and_buttons:
 		if (mw->w_backingStore != (ClientData)NULL)
 		{
 			Rect surface;
+			(*GrLockPtr)(mw, FALSE);
 			(*GrGetBackingStorePtr)(mw, &screenRect);
+			(*GrUnlockPtr)(mw);
 			WindScreenToSurface(mw, &screenRect, &surface);
 			DBWHLRedrawPrepWindow(mw, &surface);
 			WindDrawBorder(mw, &screenRect);
diff --git a/graphics/grTOGL1.c b/graphics/grTOGL1.c
index b832d88f..2fd71302 100644
--- a/graphics/grTOGL1.c
+++ b/graphics/grTOGL1.c
@@ -299,9 +299,28 @@ GrTOGLInit ()
     grXscrn = grVisualInfo->screen;
     toglCurrent.depth = grVisualInfo->depth;
 
-    /* TRUE = Direct rendering, FALSE = Indirect rendering */
-    /* (note that direct rendering may not be able to deal with pixmaps) */
+    /* glXCreateContext() 4th argument:				*/
+    /* TRUE = Direct rendering, FALSE = Indirect rendering 	*/
+
+    /* Direct rendering may not be able to deal with pixmaps. 	*/
+    /* Normally, magic should compile with OpenGL framebuffer	*/
+    /* backing store and pbuffer offscreen rendering.  However,	*/
+    /* if X11_BACKING_STORE is selected then force indirect	*/
+    /* rendering.  This can be avoided if the backing store	*/
+    /* functions sync between OpenGL and X11;  this has not	*/
+    /* been done yet.						*/
+
+    /* The CAIRO_OFFSCREEN_RENDER compile-time option uses	*/
+    /* Cairo to do the off-screen rendering, which allows	*/
+    /* OpenGL to run in direct-rendering mode only.  To do:	*/
+    /* determine from OpenGL attributes if indirect rendering	*/
+    /* is allowed, and handle automatically.			*/
+
+#ifdef X11_BACKING_STORE  
     grXcontext = glXCreateContext(grXdpy, grVisualInfo, NULL, GL_FALSE);
+#else
+    grXcontext = glXCreateContext(grXdpy, grVisualInfo, NULL, GL_TRUE);
+#endif
 
     /* Basic GL parameters */
 
@@ -868,7 +887,9 @@ keys_and_buttons:
 		if (mw->w_backingStore != (ClientData)NULL)
 		{
 		    Rect surface;
+		    (*GrLockPtr)(mw, FALSE);
 		    (*GrGetBackingStorePtr)(mw, &screenRect);
+		    (*GrUnlockPtr)(mw);
 		    WindScreenToSurface(mw, &screenRect, &surface);
 		    DBWHLRedrawPrepWindow(mw, &surface);
 		    WindDrawBorder(mw, &screenRect);
@@ -898,8 +919,6 @@ keys_and_buttons:
 void
 toglOnScreen()
 {
-    // GrLockPtr = GrTOGLLock;
-    // GrUnlockPtr = GrTOGLUnlock;
     GrSetCMapPtr = GrTOGLSetCMap;
     GrFlushPtr = GrTOGLFlush;
 
@@ -1377,7 +1396,6 @@ void
 GrTOGLUnlock(w)
     MagWindow *w;
 {
-    GrTOGLFlush();
 
 #ifdef CAIRO_OFFSCREEN_RENDER
     /* Use Cairo graphics for off-screen rendering */
@@ -1390,6 +1408,8 @@ GrTOGLUnlock(w)
     }
 #endif
 
+    GrTOGLFlush();
+
     if ((w != GR_LOCK_SCREEN) && (w->w_flags & WIND_OFFSCREEN))
     {
 	GC grXcopyGC;
@@ -1439,7 +1459,6 @@ GrTOGLUnlock(w)
 	freeMagic(pdata);
 	XFreeGC(grXdpy, grXcopyGC);
     }
-
     grSimpleUnlock(w);
 }
 
diff --git a/graphics/grTOGL3.c b/graphics/grTOGL3.c
index 8cc8dde6..458af7f3 100644
--- a/graphics/grTOGL3.c
+++ b/graphics/grTOGL3.c
@@ -37,6 +37,11 @@ extern Display *grXdpy;
 
 GLuint  grXBases[4];
 
+typedef struct {
+   GLuint framebuffer;
+   GLuint renderbuffer;
+} RenderFrame;
+
 
 /*---------------------------------------------------------
  * grtoglDrawGrid:
@@ -241,15 +246,24 @@ GrTOGLTextSize(text, size, r)
 /* backing store contains valid data or not.				*/
 
 void
-grtoglFreeBackingStore(MagWindow *window)
+grtoglFreeBackingStore(MagWindow *w)
 {
-   window->w_backingStore = (ClientData)0;
+   RenderFrame *rf;
+
+   rf = (RenderFrame *)w->w_backingStore;
+   glDeleteFramebuffers(1, &rf->framebuffer);
+   glDeleteRenderbuffers(1, &rf->renderbuffer);
+   freeMagic(w->w_backingStore);
+   w->w_backingStore = (ClientData)0;
 }
 
 void
 grtoglCreateBackingStore(MagWindow *w)
 {
+   RenderFrame *rf;
+
    Tk_Window tkwind = (Tk_Window)w->w_grdata;
+   unsigned int width, height;
 
    /* ignore all windows other than layout */
    if (w->w_client != DBWclientID) return;
@@ -257,19 +271,33 @@ grtoglCreateBackingStore(MagWindow *w)
    /* Deferred */
    if (tkwind == NULL) return;
 
-   w->w_backingStore = (ClientData)1;
+   width = w->w_screenArea.r_xtop - w->w_screenArea.r_xbot;
+   height = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
+
+   rf = (RenderFrame *)w->w_backingStore;
+   if (rf != (ClientData)NULL) {
+	glDeleteFramebuffers(1, &rf->framebuffer);
+	glDeleteRenderbuffers(1, &rf->renderbuffer);
+   }
+   else {
+        rf = (RenderFrame *)mallocMagic(sizeof(RenderFrame));
+	w->w_backingStore = (ClientData)rf;
+   }
+
+   glGenFramebuffers(1, &rf->framebuffer);
+   glGenRenderbuffers(1, &rf->renderbuffer);
+   glBindRenderbuffer(GL_RENDERBUFFER, rf->renderbuffer);
+   glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB, width, height);
 }
 
 bool
 grtoglGetBackingStore(MagWindow *w, Rect *area)
 {
+    RenderFrame *rf;
     unsigned int width, height;
     int xbot, ybot;
     Rect r;
 
-    // GLboolean result;
-    // GLint rasterpos[4];
-
     if (w->w_backingStore == (ClientData)0) return FALSE;
 
     GEO_EXPAND(area, 1, &r);
@@ -281,22 +309,20 @@ grtoglGetBackingStore(MagWindow *w, Rect *area)
     xbot = r.r_xbot;
     ybot = r.r_ybot;
 
+    rf = (RenderFrame *)w->w_backingStore;
+
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, rf->framebuffer);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+		GL_RENDERBUFFER, rf->renderbuffer);
+
     glDrawBuffer(GL_FRONT);
-    glReadBuffer(GL_BACK);
-    glRasterPos2i((GLint)xbot, (GLint)ybot);
+    glReadBuffer(GL_COLOR_ATTACHMENT0);
 
-    /* Check for valid raster position */
-    // glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID, (GLboolean *)(&result));
-    // glGetIntegerv(GL_CURRENT_RASTER_POSITION, (GLint *)(&rasterpos[0]));
-
-    // TxPrintf("Raster valid = %d, position = %d %d %d %d\n",
-    //		(int)result, (int)rasterpos[0], (int)rasterpos[1],
-    //		(int)rasterpos[2], (int)rasterpos[3]);
-    // if (result == 0)
-    //    TxPrintf("Intended position = %d %d\n", xbot, ybot);
-
-    glDisable(GL_BLEND);
-    glCopyPixels(xbot, ybot, width, height, GL_COLOR);
+    glBlitFramebuffer(r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 
     return TRUE;
 }
@@ -305,12 +331,14 @@ grtoglGetBackingStore(MagWindow *w, Rect *area)
 bool
 grtoglScrollBackingStore(MagWindow *w, Point *shift)
 {
+    RenderFrame *rf;
+    GLuint FramebufferName, RenderbufferName;
     unsigned int width, height;
     int xorigin, yorigin, xshift, yshift;
 
     if (w->w_backingStore == (ClientData)0)
     {
-	TxPrintf("grtoglScrollBackingStore %d %d failure\n",
+	fprintf(stdout, "grtoglScrollBackingStore %d %d failure\n",
 		shift->p_x, shift->p_y);
 	return FALSE;
     }
@@ -339,13 +367,23 @@ grtoglScrollBackingStore(MagWindow *w, Point *shift)
         yshift = 0;
     }
 
-    glDrawBuffer(GL_BACK);
-    glReadBuffer(GL_BACK);
-    glRasterPos2i((GLint)xshift, (GLint)yshift);
-    glDisable(GL_BLEND);
-    glCopyPixels(xorigin, yorigin, width, height, GL_COLOR);
+    rf = (RenderFrame *)w->w_backingStore;
 
-    glDrawBuffer(GL_FRONT);
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, rf->framebuffer);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+		GL_RENDERBUFFER, rf->renderbuffer);
+
+    glBlitFramebuffer(xorigin, yorigin, xorigin + width, yorigin + height,
+		xshift, yshift, xshift + width, yshift + height,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, rf->framebuffer);
+    glBlitFramebuffer(xshift, yshift, xshift + width, yshift + height,
+		xshift, yshift, xshift + width, yshift + height,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 
     return TRUE;
 }
@@ -353,48 +391,41 @@ grtoglScrollBackingStore(MagWindow *w, Point *shift)
 void
 grtoglPutBackingStore(MagWindow *w, Rect *area)
 {
+    RenderFrame *rf;
+    GLuint FramebufferName, RenderbufferName;
     unsigned int width, height;
     int ybot, xbot;
-
-    // GLboolean result;
-    // GLint rasterpos[4];
+    Rect r;
 
     if (w->w_backingStore == (ClientData)0) return;
 
-    width = area->r_xtop - area->r_xbot;
-    height = area->r_ytop - area->r_ybot;
-
-    ybot = area->r_ybot;
-    xbot = area->r_xbot;
-
-    if (xbot < 0) {
-	width -= xbot;
-	xbot = 0;
+    if (w->w_flags & WIND_OBSCURED)
+    {
+	grtoglFreeBackingStore(w);
+	return;
     }
 
-    if (ybot < 0) {
-	height -= ybot;
-	ybot = 0;
-    }
+    GEO_EXPAND(area, 1, &r);
+    GeoClip(&r, &(w->w_screenArea));
 
+    width = r.r_xtop - r.r_xbot;
+    height = r.r_ytop - r.r_ybot;
+    ybot = r.r_ybot;
+    xbot = r.r_xbot;
+
+    rf = (RenderFrame *)w->w_backingStore;
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, rf->framebuffer);
+    glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+		GL_RENDERBUFFER, rf->renderbuffer);
+
+    glDrawBuffer(GL_COLOR_ATTACHMENT0);
     glReadBuffer(GL_FRONT);
-    glDrawBuffer(GL_BACK);
-    glRasterPos2i((GLint)xbot, (GLint)ybot);
 
-    /* Check for valid raster position */
-    // glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID, (GLboolean *)(&result));
-    // glGetIntegerv(GL_CURRENT_RASTER_POSITION, (GLint *)(&rasterpos[0]));
-
-    // TxPrintf("Raster valid = %d, position = %d %d %d %d\n",
-    //		(int)result, (int)rasterpos[0], (int)rasterpos[1],
-    //		(int)rasterpos[2], (int)rasterpos[3]);
-    // if (result == 0)
-    //    TxPrintf("Intended position = %d %d\n", xbot, ybot);
-
-    glDisable(GL_BLEND);
-    glCopyPixels(xbot, ybot, width, height, GL_COLOR);
-
-    glDrawBuffer(GL_FRONT);	/* Return to normal front rendering */
+    glBlitFramebuffer(r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 }
 
 
diff --git a/graphics/grTOGL3.c.new b/graphics/grTOGL3.c.new
new file mode 100644
index 00000000..47ec181c
--- /dev/null
+++ b/graphics/grTOGL3.c.new
@@ -0,0 +1,804 @@
+/* grTOGL3.c -
+ *
+ * Copyright 2003 Open Circuit Design, Inc., for MultiGiG Ltd.
+ *
+ * This file contains additional functions to manipulate an X window system
+ * color display.  Included here are device-dependent routines to draw and 
+ * erase text and draw a grid.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <GL/glu.h>
+
+#include "tcltk/tclmagic.h"
+#include "utils/magic.h"
+#include "utils/geometry.h"
+#include "utils/malloc.h"
+#include "windows/windows.h"
+#include "graphics/graphics.h"
+#include "graphics/graphicsInt.h"
+#include "dbwind/dbwind.h"
+#include "textio/textio.h"
+#include "utils/signals.h"
+#include "utils/utils.h"
+#include "utils/hash.h"
+#include "graphics/grTOGLInt.h"
+#include "graphics/grTkCommon.h"
+#include "database/fonts.h"
+
+extern Display *grXdpy;
+
+/* locals */
+
+GLuint  grXBases[4];
+
+
+/*---------------------------------------------------------
+ * grtoglDrawGrid:
+ *	grxDrawGrid adds a grid to the grid layer, using the current
+ *	write mask and color.
+ *
+ * Results:
+ *	TRUE is returned normally.  However, if the grid gets too small
+ *	to be useful, then nothing is drawn and FALSE is returned.
+ *
+ * Side Effects:    None.
+ *---------------------------------------------------------
+ */
+
+bool
+grtoglDrawGrid (prect, outline, clip)
+    Rect *prect;			/* A rectangle that forms the template
+			         * for the grid.  Note:  in order to maintain
+			         * precision for the grid, the rectangle
+			         * coordinates are specified in units of
+			         * screen coordinates multiplied by SUBPIXEL.
+			         */
+    int outline;		/* the outline style */
+    Rect *clip;			/* a clipping rectangle */
+{
+    int xsize, ysize;
+    int x, y;
+    int xstart, ystart;
+    int snum, low, hi, shifted;
+
+    xsize = prect->r_xtop - prect->r_xbot;
+    ysize = prect->r_ytop - prect->r_ybot;
+    if (!xsize || !ysize || GRID_TOO_SMALL(xsize, ysize))
+	return FALSE;
+    
+    xstart = prect->r_xbot % xsize;
+    while (xstart < clip->r_xbot << SUBPIXELBITS) xstart += xsize;
+    ystart = prect->r_ybot % ysize;
+    while (ystart < clip->r_ybot << SUBPIXELBITS) ystart += ysize;
+    
+    grtoglSetLineStyle(outline);
+
+    glBegin(GL_LINES);
+
+    snum = 0;
+    low = clip->r_ybot;
+    hi = clip->r_ytop;
+    for (x = xstart; x < (clip->r_xtop+1) << SUBPIXELBITS; x += xsize)
+    {
+	shifted = x >> SUBPIXELBITS;
+	glVertex2i(shifted, low);
+	glVertex2i(shifted, hi);
+	snum++;
+    }
+
+    snum = 0;
+    low = clip->r_xbot;
+    hi = clip->r_xtop;
+    for (y = ystart; y < (clip->r_ytop+1) << SUBPIXELBITS; y += ysize)
+    {
+	shifted = y >> SUBPIXELBITS;
+	glVertex2i(low, shifted);
+	glVertex2i(hi, shifted);
+	snum++;
+    }
+    glEnd();
+    return TRUE;
+}
+
+
+/*---------------------------------------------------------
+ * grtoglLoadFont
+ *	This local routine transfers the X font bitmaps
+ *	into OpenGL display lists for simple text
+ *	rendering.
+ *
+ * Results:	Success/Failure
+ *
+ * Side Effects:    None.
+ *---------------------------------------------------------
+ */
+
+bool
+grtoglLoadFont()
+{
+    Font id;
+    unsigned int i;
+
+    for (i = 0; i < 4; i++) {
+	id = Tk_FontId(grTkFonts[i]);
+
+	grXBases[i] = glGenLists(256);
+	if (grXBases[i] == 0) {
+	    TxError("Out of display lists!\n");
+	    return FALSE;
+	}
+	glXUseXFont(id, 0, 256, grXBases[i]);
+    }
+    return TRUE;
+}
+
+
+/*---------------------------------------------------------
+ * grtoglSetCharSize:
+ *	This local routine sets the character size in the display,
+ *	if necessary.
+ *
+ * Results:	None.
+ *
+ * Side Effects:    None.
+ *---------------------------------------------------------
+ */
+
+void
+grtoglSetCharSize (size)
+    int size;		/* Width of characters, in pixels (6 or 8). */
+{
+    toglCurrent.fontSize = size;
+    switch (size)
+    {
+	case GR_TEXT_DEFAULT:
+	case GR_TEXT_SMALL:
+	    toglCurrent.font = grSmallFont;
+	    break;
+	case GR_TEXT_MEDIUM:
+	    toglCurrent.font = grMediumFont;
+	    break;
+	case GR_TEXT_LARGE:
+	    toglCurrent.font = grLargeFont;
+	    break;
+	case GR_TEXT_XLARGE:
+	    toglCurrent.font = grXLargeFont;
+	    break;
+	default:
+	    TxError("%s%d\n", "grtoglSetCharSize: Unknown character size ",
+		size );
+	    break;
+    }
+}
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * GrTOGLTextSize --
+ *
+ *	Determine the size of a text string. 
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	A rectangle is filled in that is the size of the text in pixels.
+ *	The origin (0, 0) of this rectangle is located on the baseline
+ *	at the far left side of the string.
+ * ----------------------------------------------------------------------------
+ */
+
+void
+GrTOGLTextSize(text, size, r)
+    char *text;
+    int size;
+    Rect *r;
+{
+    Tk_FontMetrics overall;
+    Tk_Font font;
+    int width;
+    
+    switch (size) {
+    case GR_TEXT_DEFAULT:
+    case GR_TEXT_SMALL:
+	font = grSmallFont;
+	break;
+    case GR_TEXT_MEDIUM:
+	font = grMediumFont;
+	break;
+    case GR_TEXT_LARGE:
+	font = grLargeFont;
+	break;
+    case GR_TEXT_XLARGE:
+	font = grXLargeFont;
+	break;
+    default:
+	TxError("%s%d\n", "GrTOGLTextSize: Unknown character size ",
+		size );
+	break;
+    }
+    if (font == NULL) return;
+    Tk_GetFontMetrics(font, &overall);
+    width = Tk_TextWidth(font, text, strlen(text));
+    /* Hack alert!  Tk_TextWidth returns values too small! */
+    width = width + (width >> 4);
+    r->r_ytop = overall.ascent;
+    r->r_ybot = -overall.descent;
+    r->r_xtop = width;
+    r->r_xbot = 0;
+}
+
+static GLuint FramebufferName = 0;
+
+/* OpenGL backing store functions (now removed from the X11-based ones) */
+/* Since we always paint into the front buffer, the back buffer is	*/
+/* always available for backing store.  We need not create or destroy	*/
+/* it.	We just use the w_backingStore location to store whether the	*/
+/* backing store contains valid data or not.				*/
+
+void
+grtoglFreeBackingStore(MagWindow *window)
+{
+   GLuint RenderbufferName;
+
+   RenderbufferName = (GLuint)window->w_backingStore;
+   glDeleteRenderbuffers(1, &RenderbufferName);
+   window->w_backingStore = (ClientData)0;
+}
+
+void
+grtoglCreateBackingStore(MagWindow *w)
+{
+   GLuint RenderbufferName;
+   Tk_Window tkwind = (Tk_Window)w->w_grdata;
+   unsigned int width, height;
+
+   /* ignore all windows other than layout */
+   if (w->w_client != DBWclientID) return;
+
+   /* Deferred */
+   if (tkwind == NULL) return;
+
+   width = w->w_screenArea.r_xtop - w->w_screenArea.r_xbot;
+   height = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
+
+   /* Do this only once */
+   if (FramebufferName == 0) {
+	glGenFramebuffers(1, &FramebufferName);
+   }
+
+   RenderbufferName = (GLuint)(w->w_backingStore);
+   if (RenderbufferName != 0) {
+	glDeleteRenderbuffers(1, &RenderbufferName);
+   }
+
+   glGenRenderbuffers(1, &RenderbufferName);
+   TxPrintf("create:  Renderbuffer is %d\n", RenderbufferName);
+   glBindRenderbuffer(GL_RENDERBUFFER, RenderbufferName);
+   glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB, width, height);
+   w->w_backingStore = (ClientData)RenderbufferName;
+}
+
+bool
+grtoglGetBackingStore(MagWindow *w, Rect *area)
+{
+    GLuint RenderbufferName;
+    unsigned int width, height;
+    int xbot, ybot;
+    Rect r;
+
+    // GLboolean result;
+    // GLint rasterpos[4];
+
+    if (w->w_backingStore == (ClientData)0) return FALSE;
+
+    GEO_EXPAND(area, 1, &r);
+    GeoClip(&r, &(w->w_screenArea));
+
+    width = r.r_xtop - r.r_xbot;
+    height = r.r_ytop - r.r_ybot;
+
+    xbot = r.r_xbot;
+    ybot = r.r_ybot;
+
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, FramebufferName);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+
+    RenderbufferName = (GLuint)w->w_backingStore;
+    TxPrintf("get:  Renderbuffer is %d\n", RenderbufferName);
+    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+		GL_RENDERBUFFER, RenderbufferName);
+
+    glDrawBuffer(GL_FRONT);
+    glReadBuffer(GL_COLOR_ATTACHMENT0);
+
+    // glDrawBuffer(GL_FRONT);
+    // glReadBuffer(GL_BACK);
+    // glRasterPos2i((GLint)xbot, (GLint)ybot);
+
+    /* Check for valid raster position */
+    // glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID, (GLboolean *)(&result));
+    // glGetIntegerv(GL_CURRENT_RASTER_POSITION, (GLint *)(&rasterpos[0]));
+
+    // TxPrintf("Raster valid = %d, position = %d %d %d %d\n",
+    //		(int)result, (int)rasterpos[0], (int)rasterpos[1],
+    //		(int)rasterpos[2], (int)rasterpos[3]);
+    // if (result == 0)
+    //      TxPrintf("Intended position = %d %d\n", xbot, ybot);
+
+    // glDisable(GL_BLEND);
+    // glCopyPixels(xbot, ybot, width, height, GL_COLOR);
+
+    glBlitFramebuffer(r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+
+    return TRUE;
+}
+
+
+bool
+grtoglScrollBackingStore(MagWindow *w, Point *shift)
+{
+    GLuint RenderbufferName;
+    unsigned int width, height;
+    int xorigin, yorigin, xshift, yshift;
+
+    if (w->w_backingStore == (ClientData)0)
+    {
+	TxPrintf("grtoglScrollBackingStore %d %d failure\n",
+		shift->p_x, shift->p_y);
+	return FALSE;
+    }
+
+    width = w->w_screenArea.r_xtop - w->w_screenArea.r_xbot;
+    height = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
+    xorigin = 0;
+    yorigin = 0;
+    xshift = shift->p_x;
+    yshift = shift->p_y;
+
+    if (xshift > 0)
+        width -= xshift;
+    else if (xshift < 0)
+    {
+        width += xshift;
+        xorigin = -xshift;
+        xshift = 0;
+    }
+    if (yshift > 0)
+        height -= yshift;
+    else if (yshift < 0)
+    {
+        height += yshift;
+        yorigin = -yshift;
+        yshift = 0;
+    }
+
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, FramebufferName);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+
+    RenderbufferName = (GLuint)w->w_backingStore;
+    TxPrintf("scroll:  Renderbuffer is %d\n", RenderbufferName);
+    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+		GL_RENDERBUFFER, RenderbufferName);
+
+
+    // glDrawBuffer(GL_BACK);
+    // glReadBuffer(GL_BACK);
+    // glRasterPos2i((GLint)xshift, (GLint)yshift);
+    // glDisable(GL_BLEND);
+    // glCopyPixels(xorigin, yorigin, width, height, GL_COLOR);
+
+    glBlitFramebuffer(xorigin, yorigin, xorigin + width, yorigin + height,
+		xshift, yshift, xshift + width, yshift + height,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+
+/*
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FramebufferName);
+
+    glBlitFramebuffer(xshift, yshift, xshift + width, yshift + height,
+		xshift, yshift, xshift + width, yshift + height,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+*/
+    // glDrawBuffer(GL_FRONT);
+
+    return TRUE;
+}
+
+void
+grtoglPutBackingStore(MagWindow *w, Rect *area)
+{
+    GLuint RenderbufferName;
+    unsigned int width, height;
+    int ybot, xbot;
+    Rect r;
+
+    // GLboolean result;
+    // GLint rasterpos[4];
+
+    if (w->w_backingStore == (ClientData)0) return;
+
+    GEO_EXPAND(area, 1, &r);
+    GeoClip(&r, &(w->w_screenArea));
+
+    /*
+    width = area->r_xtop - area->r_xbot;
+    height = area->r_ytop - area->r_ybot;
+
+    ybot = area->r_ybot;
+    xbot = area->r_xbot;
+    */
+
+    width = r.r_xtop - r.r_xbot;
+    height = r.r_ytop - r.r_ybot;
+    ybot = r.r_ybot;
+    xbot = r.r_xbot;
+
+    /*
+    if (xbot < 0) {
+	width -= xbot;
+	xbot = 0;
+    }
+
+    if (ybot < 0) {
+	height -= ybot;
+	ybot = 0;
+    }
+    */
+
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FramebufferName);
+
+    RenderbufferName = (GLuint)w->w_backingStore;
+    TxPrintf("put:  Renderbuffer is %d\n", RenderbufferName);
+    glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+		GL_RENDERBUFFER, RenderbufferName);
+
+    glDrawBuffer(GL_COLOR_ATTACHMENT0);
+    glReadBuffer(GL_FRONT);
+    // glReadBuffer(GL_FRONT);
+    // glDrawBuffer(GL_BACK);
+    // glRasterPos2i((GLint)xbot, (GLint)ybot);
+
+    /* Check for valid raster position */
+    // glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID, (GLboolean *)(&result));
+    // glGetIntegerv(GL_CURRENT_RASTER_POSITION, (GLint *)(&rasterpos[0]));
+
+    // TxPrintf("Raster valid = %d, position = %d %d %d %d\n",
+    //		(int)result, (int)rasterpos[0], (int)rasterpos[1],
+    //		(int)rasterpos[2], (int)rasterpos[3]);
+    // if (result == 0)
+    //     TxPrintf("Intended position = %d %d\n", xbot, ybot);
+
+    /* This area may need to be expanded by a pixel and/or      */
+    /* expanded by GrPixelCorrect to compensate for the OpenGL  */
+    /* coordinate system.                                       */
+
+    // glDisable(GL_BLEND);
+    // glCopyPixels(xbot, ybot, width, height, GL_COLOR);
+
+    glBlitFramebuffer(r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		r.r_xbot, r.r_ybot, r.r_xtop, r.r_ytop,
+		GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+
+    // glDrawBuffer(GL_FRONT);	/* Return to normal front rendering */
+}
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * GrTOGLReadPixel --
+ *
+ *	Read one pixel from the screen.
+ *
+ * Results:
+ *	An integer containing the pixel's color.
+ *
+ * Side effects:
+ *	none.
+ *
+ * ----------------------------------------------------------------------------
+ */
+
+int
+GrTOGLReadPixel (w, x, y)
+    MagWindow *w;
+    int x,y;		/* the location of a pixel in screen coords */
+{
+    return 0;		/* OpenGL has no such function, so return 0 */
+}
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * GrTOGLBitBlt --
+ *
+ *	Copy information in bit block transfers.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	changes the screen.
+ * ----------------------------------------------------------------------------
+ */
+
+void
+GrTOGLBitBlt(r, p)
+    Rect *r;
+    Point *p;
+{
+    glCopyPixels(r->r_xbot, r->r_ybot, r->r_xtop - r->r_xbot + 1,
+		r->r_ytop - r->r_ybot + 1, GL_COLOR);
+}
+
+#ifdef VECTOR_FONTS
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Technically, there should be no self-intersecting polygons in outline
+ * fonts.  However, decomposition of bezier curves into line segments
+ * may occasionally produce one, so it needs to be handled.
+ *----------------------------------------------------------------------
+ */
+
+void
+myCombine(GLdouble coords[3], GLdouble *vertex_data[4],
+          GLfloat weight[4], GLdouble **outData, void *dataptr)
+{
+    /* This needs to be free'd at the end of gluTessEndPolygon()! */
+    GLdouble *new = (GLdouble *)mallocMagic(2 * sizeof(GLdouble));
+    new[0] = coords[0];
+    new[1] = coords[1];
+    *outData = new;
+    /* Diagnostic */
+    TxError("Intersecting polygon in char \"%c\" at %g %g!\n", 
+	*((char *)dataptr), coords[0], coords[1]);
+}
+
+/*
+ *----------------------------------------------------------------------
+ * Draw a text character
+ * This routine differs from grtoglFillPolygon() in that it uses the
+ * glu library to handle non-convex polygons as may appear in font
+ * outlines.
+ *----------------------------------------------------------------------
+ */
+
+void
+grtoglDrawCharacter(clist, tc, pixsize)
+    FontChar *clist;
+    unsigned char tc;
+    int pixsize;
+{
+    Point *tp;
+    int np, nptotal;
+    int i, j;
+    static GLUtesselator *tess = NULL;
+    static GLdouble *v = NULL;
+    static int maxnp = 0;
+    FontChar *ccur;
+
+    if (pixsize < 5) return;	/* Label too small to be useful */
+
+    if (tess == NULL)
+    {
+	tess = gluNewTess();
+	gluTessCallback(tess, GLU_TESS_BEGIN, (_GLUfuncptr)glBegin);
+	gluTessCallback(tess, GLU_TESS_VERTEX, (_GLUfuncptr)glVertex3dv);
+	gluTessCallback(tess, GLU_TESS_END, (_GLUfuncptr)glEnd);
+	gluTessCallback(tess, GLU_TESS_COMBINE_DATA, (_GLUfuncptr)myCombine);
+    }
+    // Boundary-only does not look particularly good. . .
+    gluTessProperty(tess, GLU_TESS_BOUNDARY_ONLY, GL_FALSE);
+
+    nptotal = 0;
+    for (ccur = clist; ccur != NULL; ccur = ccur->fc_next)
+	nptotal += ccur->fc_numpoints;
+
+    if (nptotal > maxnp)
+    {
+	if (v != NULL) freeMagic((char *)v);
+	maxnp = nptotal;
+	v = (GLdouble *)mallocMagic(nptotal * 3 * sizeof(GLdouble));
+    }
+
+    j = 0;
+    for (ccur = clist; ccur != NULL; ccur = ccur->fc_next)
+    {
+	tp = ccur->fc_points;
+	np = ccur->fc_numpoints;
+
+	for (i = 0; i < np; i++, j += 3) {
+	    v[j] = tp[i].p_x;
+	    v[j + 1] = tp[i].p_y;
+	    v[j + 2] = 0;
+	}
+    }
+
+    gluTessBeginPolygon(tess, (GLvoid *)(&tc));
+    j = 0;
+    for (ccur = clist; ccur != NULL; ccur = ccur->fc_next)
+    {
+	np = ccur->fc_numpoints;
+	gluTessBeginContour(tess);
+	for (i = 0; i < np; i++, j += 3) {
+	    gluTessVertex(tess, &v[j], &v[j]);
+	}
+	gluTessEndContour(tess);
+    }
+    gluTessEndPolygon(tess);
+}
+
+/*---------------------------------------------------------
+ * grtoglFontText:
+ *
+ *	This routine draws text from font vectors using the
+ *	font vector routines in DBlabel.c.  Text is clipped
+ *	to the clipping rectangle.
+ *
+ *	For speed, we should be transferring the font
+ *	vectors into OpenGL display lists!
+ *	
+ *---------------------------------------------------------
+ */
+
+void
+grtoglFontText(text, font, size, rotate, pos, clip, obscure)
+    char *text;			/* The text to be drawn */
+    int   font;			/* Font to use from fontList */
+    int   size;			/* Pixel size of the font */
+    int	  rotate;		/* Text rotation */
+    Point *pos;			/* Text base position */
+    Rect  *clip;		/* Clipping area */
+    LinkedRect *obscure;	/* List of obscuring areas */ 
+{
+    char *tptr;
+    Point *coffset;		/* vector to next character */
+    Rect *cbbox;
+    GLfloat fsize, matvals[16];
+    FontChar *clist;
+    int cheight, baseline;
+    float tmp;
+
+    /* Keep it simple for now---ignore clip and obscure */
+
+    glDisable(GL_BLEND);
+    glPushMatrix();
+    glTranslated(pos->p_x, pos->p_y, 0);
+    glRotated(rotate, 0, 0, 1);
+
+    /* Get label size */
+    cbbox = &DBFontList[font]->mf_extents;
+
+    fsize = (GLfloat)size / (GLfloat)cbbox->r_ytop;
+    glScalef(fsize, fsize, 1.0);
+
+    /* Adjust to baseline */
+    baseline = 0;
+    for (tptr = text; *tptr != '\0'; tptr++)
+    {
+	DBFontChar(font, *tptr, NULL, NULL, &cbbox);
+	if (cbbox->r_ybot < baseline)
+	    baseline = cbbox->r_ybot;
+    }
+    glTranslated(0, -baseline, 0);
+
+    for (tptr = text; *tptr != '\0'; tptr++)
+    {
+	DBFontChar(font, *tptr, &clist, &coffset, NULL);
+	grtoglDrawCharacter(clist, *tptr, size);
+	glTranslated(coffset->p_x, coffset->p_y, 0);
+    }
+    glPopMatrix();
+}
+
+#endif /* VECTOR_FONTS */
+
+/*---------------------------------------------------------
+ * grtoglPutText:
+ *      (modified on SunPutText)
+ *
+ *	This routine puts a chunk of text on the screen in the current
+ *	color, size, etc.  The caller must ensure that it fits on
+ *	the screen -- no clipping is done except to the obscuring rectangle
+ *	list and the clip rectangle.
+ *
+ * Results:	
+ *	none.
+ *
+ * Side Effects:
+ *	The text is drawn on the screen.  
+ *
+ *---------------------------------------------------------
+ */
+
+void
+grtoglPutText (text, pos, clip, obscure)
+    char *text;			/* The text to be drawn. */
+    Point *pos;			/* A point located at the leftmost point of
+				 * the baseline for this string.
+				 */
+    Rect *clip;			/* A rectangle to clip against */
+    LinkedRect *obscure;	/* A list of obscuring rectangles */
+
+{
+    Rect location;
+    Rect overlap;
+    Rect textrect;
+    LinkedRect *ob;
+    void grTOGLGeoSub();
+    int i;
+    float tscale;
+
+    GrTOGLTextSize(text, toglCurrent.fontSize, &textrect);
+
+    location.r_xbot = pos->p_x + textrect.r_xbot;
+    location.r_xtop = pos->p_x + textrect.r_xtop;
+    location.r_ybot = pos->p_y + textrect.r_ybot;
+    location.r_ytop = pos->p_y + textrect.r_ytop;
+
+    /* erase parts of the bitmap that are obscured */
+    for (ob = obscure; ob != NULL; ob = ob->r_next)
+    {
+	if (GEO_TOUCH(&ob->r_r, &location))
+	{
+	    overlap = location;
+	    GeoClip(&overlap, &ob->r_r);
+	    grTOGLGeoSub(&location, &overlap);
+	}
+    }
+ 
+    overlap = location;
+    GeoClip(&overlap, clip);
+
+    /* copy the text to the color screen */
+    if ((overlap.r_xbot < overlap.r_xtop)&&(overlap.r_ybot <= overlap.r_ytop))
+    {
+	glScissor(overlap.r_xbot, overlap.r_ybot, overlap.r_xtop - overlap.r_xbot,
+		overlap.r_ytop - overlap.r_ybot);
+	glEnable(GL_SCISSOR_TEST);
+	glDisable(GL_BLEND);
+	glRasterPos2i(pos->p_x, pos->p_y);
+	glListBase(grXBases[(toglCurrent.fontSize == GR_TEXT_DEFAULT) ?
+		GR_TEXT_SMALL : toglCurrent.fontSize]);
+	glCallLists(strlen(text), GL_UNSIGNED_BYTE, (unsigned char *)text);
+	glDisable(GL_SCISSOR_TEST);
+    }
+}
+
+
+/* grTOGLGeoSub:
+ *	return the tallest sub-rectangle of r not obscured by area
+ *	area must be within r.
+ */
+
+void
+grTOGLGeoSub(r, area)
+Rect *r;		/* Rectangle to be subtracted from. */
+Rect *area;		/* Area to be subtracted. */
+
+{
+    if (r->r_xbot == area->r_xbot) r->r_xbot = area->r_xtop;
+    else
+    if (r->r_xtop == area->r_xtop) r->r_xtop = area->r_xbot;
+    else
+    if (r->r_ybot <= area->r_ybot) r->r_ybot = area->r_ytop;
+    else
+    if (r->r_ytop == area->r_ytop) r->r_ytop = area->r_ybot;
+    else
+    r->r_xtop = area->r_xbot;
+}
diff --git a/graphics/grTOGL3.c.orig b/graphics/grTOGL3.c.orig
new file mode 100644
index 00000000..c9b388ee
--- /dev/null
+++ b/graphics/grTOGL3.c.orig
@@ -0,0 +1,723 @@
+/* grTOGL3.c -
+ *
+ * Copyright 2003 Open Circuit Design, Inc., for MultiGiG Ltd.
+ *
+ * This file contains additional functions to manipulate an X window system
+ * color display.  Included here are device-dependent routines to draw and 
+ * erase text and draw a grid.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <GL/glu.h>
+
+#include "tcltk/tclmagic.h"
+#include "utils/magic.h"
+#include "utils/geometry.h"
+#include "utils/malloc.h"
+#include "windows/windows.h"
+#include "graphics/graphics.h"
+#include "graphics/graphicsInt.h"
+#include "dbwind/dbwind.h"
+#include "textio/textio.h"
+#include "utils/signals.h"
+#include "utils/utils.h"
+#include "utils/hash.h"
+#include "graphics/grTOGLInt.h"
+#include "graphics/grTkCommon.h"
+#include "database/fonts.h"
+
+extern Display *grXdpy;
+
+/* locals */
+
+GLuint  grXBases[4];
+
+
+/*---------------------------------------------------------
+ * grtoglDrawGrid:
+ *	grxDrawGrid adds a grid to the grid layer, using the current
+ *	write mask and color.
+ *
+ * Results:
+ *	TRUE is returned normally.  However, if the grid gets too small
+ *	to be useful, then nothing is drawn and FALSE is returned.
+ *
+ * Side Effects:    None.
+ *---------------------------------------------------------
+ */
+
+bool
+grtoglDrawGrid (prect, outline, clip)
+    Rect *prect;			/* A rectangle that forms the template
+			         * for the grid.  Note:  in order to maintain
+			         * precision for the grid, the rectangle
+			         * coordinates are specified in units of
+			         * screen coordinates multiplied by SUBPIXEL.
+			         */
+    int outline;		/* the outline style */
+    Rect *clip;			/* a clipping rectangle */
+{
+    int xsize, ysize;
+    int x, y;
+    int xstart, ystart;
+    int snum, low, hi, shifted;
+
+    xsize = prect->r_xtop - prect->r_xbot;
+    ysize = prect->r_ytop - prect->r_ybot;
+    if (!xsize || !ysize || GRID_TOO_SMALL(xsize, ysize))
+	return FALSE;
+    
+    xstart = prect->r_xbot % xsize;
+    while (xstart < clip->r_xbot << SUBPIXELBITS) xstart += xsize;
+    ystart = prect->r_ybot % ysize;
+    while (ystart < clip->r_ybot << SUBPIXELBITS) ystart += ysize;
+    
+    grtoglSetLineStyle(outline);
+
+    glBegin(GL_LINES);
+
+    snum = 0;
+    low = clip->r_ybot;
+    hi = clip->r_ytop;
+    for (x = xstart; x < (clip->r_xtop+1) << SUBPIXELBITS; x += xsize)
+    {
+	shifted = x >> SUBPIXELBITS;
+	glVertex2i(shifted, low);
+	glVertex2i(shifted, hi);
+	snum++;
+    }
+
+    snum = 0;
+    low = clip->r_xbot;
+    hi = clip->r_xtop;
+    for (y = ystart; y < (clip->r_ytop+1) << SUBPIXELBITS; y += ysize)
+    {
+	shifted = y >> SUBPIXELBITS;
+	glVertex2i(low, shifted);
+	glVertex2i(hi, shifted);
+	snum++;
+    }
+    glEnd();
+    return TRUE;
+}
+
+
+/*---------------------------------------------------------
+ * grtoglLoadFont
+ *	This local routine transfers the X font bitmaps
+ *	into OpenGL display lists for simple text
+ *	rendering.
+ *
+ * Results:	Success/Failure
+ *
+ * Side Effects:    None.
+ *---------------------------------------------------------
+ */
+
+bool
+grtoglLoadFont()
+{
+    Font id;
+    unsigned int i;
+
+    for (i = 0; i < 4; i++) {
+	id = Tk_FontId(grTkFonts[i]);
+
+	grXBases[i] = glGenLists(256);
+	if (grXBases[i] == 0) {
+	    TxError("Out of display lists!\n");
+	    return FALSE;
+	}
+	glXUseXFont(id, 0, 256, grXBases[i]);
+    }
+    return TRUE;
+}
+
+
+/*---------------------------------------------------------
+ * grtoglSetCharSize:
+ *	This local routine sets the character size in the display,
+ *	if necessary.
+ *
+ * Results:	None.
+ *
+ * Side Effects:    None.
+ *---------------------------------------------------------
+ */
+
+void
+grtoglSetCharSize (size)
+    int size;		/* Width of characters, in pixels (6 or 8). */
+{
+    toglCurrent.fontSize = size;
+    switch (size)
+    {
+	case GR_TEXT_DEFAULT:
+	case GR_TEXT_SMALL:
+	    toglCurrent.font = grSmallFont;
+	    break;
+	case GR_TEXT_MEDIUM:
+	    toglCurrent.font = grMediumFont;
+	    break;
+	case GR_TEXT_LARGE:
+	    toglCurrent.font = grLargeFont;
+	    break;
+	case GR_TEXT_XLARGE:
+	    toglCurrent.font = grXLargeFont;
+	    break;
+	default:
+	    TxError("%s%d\n", "grtoglSetCharSize: Unknown character size ",
+		size );
+	    break;
+    }
+}
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * GrTOGLTextSize --
+ *
+ *	Determine the size of a text string. 
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	A rectangle is filled in that is the size of the text in pixels.
+ *	The origin (0, 0) of this rectangle is located on the baseline
+ *	at the far left side of the string.
+ * ----------------------------------------------------------------------------
+ */
+
+void
+GrTOGLTextSize(text, size, r)
+    char *text;
+    int size;
+    Rect *r;
+{
+    Tk_FontMetrics overall;
+    Tk_Font font;
+    int width;
+    
+    switch (size) {
+    case GR_TEXT_DEFAULT:
+    case GR_TEXT_SMALL:
+	font = grSmallFont;
+	break;
+    case GR_TEXT_MEDIUM:
+	font = grMediumFont;
+	break;
+    case GR_TEXT_LARGE:
+	font = grLargeFont;
+	break;
+    case GR_TEXT_XLARGE:
+	font = grXLargeFont;
+	break;
+    default:
+	TxError("%s%d\n", "GrTOGLTextSize: Unknown character size ",
+		size );
+	break;
+    }
+    if (font == NULL) return;
+    Tk_GetFontMetrics(font, &overall);
+    width = Tk_TextWidth(font, text, strlen(text));
+    /* Hack alert!  Tk_TextWidth returns values too small! */
+    width = width + (width >> 4);
+    r->r_ytop = overall.ascent;
+    r->r_ybot = -overall.descent;
+    r->r_xtop = width;
+    r->r_xbot = 0;
+}
+
+/* OpenGL backing store functions (now removed from the X11-based ones) */
+/* Since we always paint into the front buffer, the back buffer is	*/
+/* always available for backing store.  We need not create or destroy	*/
+/* it.	We just use the w_backingStore location to store whether the	*/
+/* backing store contains valid data or not.				*/
+
+void
+grtoglFreeBackingStore(MagWindow *window)
+{
+   window->w_backingStore = (ClientData)0;
+}
+
+void
+grtoglCreateBackingStore(MagWindow *w)
+{
+   Tk_Window tkwind = (Tk_Window)w->w_grdata;
+
+   /* ignore all windows other than layout */
+   if (w->w_client != DBWclientID) return;
+
+   /* Deferred */
+   if (tkwind == NULL) return;
+
+   w->w_backingStore = (ClientData)1;
+}
+
+bool
+grtoglGetBackingStore(MagWindow *w, Rect *area)
+{
+    unsigned int width, height;
+    int xbot, ybot;
+    Rect r;
+
+    // GLboolean result;
+    // GLint rasterpos[4];
+
+    if (w->w_backingStore == (ClientData)0) return FALSE;
+
+    GEO_EXPAND(area, 1, &r);
+    GeoClip(&r, &(w->w_screenArea));
+
+    width = r.r_xtop - r.r_xbot;
+    height = r.r_ytop - r.r_ybot;
+
+    xbot = r.r_xbot;
+    ybot = r.r_ybot;
+
+    glDrawBuffer(GL_FRONT);
+    glReadBuffer(GL_BACK);
+    glRasterPos2i((GLint)xbot, (GLint)ybot);
+
+    /* Check for valid raster position */
+    // glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID, (GLboolean *)(&result));
+    // glGetIntegerv(GL_CURRENT_RASTER_POSITION, (GLint *)(&rasterpos[0]));
+
+    // TxPrintf("Raster valid = %d, position = %d %d %d %d\n",
+    //		(int)result, (int)rasterpos[0], (int)rasterpos[1],
+    //		(int)rasterpos[2], (int)rasterpos[3]);
+    // if (result == 0)
+    //      TxPrintf("Intended position = %d %d\n", xbot, ybot);
+
+    glDisable(GL_BLEND);
+    glCopyPixels(xbot, ybot, width, height, GL_COLOR);
+
+    return TRUE;
+}
+
+
+bool
+grtoglScrollBackingStore(MagWindow *w, Point *shift)
+{
+    unsigned int width, height;
+    int xorigin, yorigin, xshift, yshift;
+
+    if (w->w_backingStore == (ClientData)0)
+    {
+	TxPrintf("grtoglScrollBackingStore %d %d failure\n",
+		shift->p_x, shift->p_y);
+	return FALSE;
+    }
+
+    width = w->w_screenArea.r_xtop - w->w_screenArea.r_xbot;
+    height = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
+    xorigin = 0;
+    yorigin = 0;
+    xshift = shift->p_x;
+    yshift = shift->p_y;
+
+    if (xshift > 0)
+        width -= xshift;
+    else if (xshift < 0)
+    {
+        width += xshift;
+        xorigin = -xshift;
+        xshift = 0;
+    }
+    if (yshift > 0)
+        height -= yshift;
+    else if (yshift < 0)
+    {
+        height += yshift;
+        yorigin = -yshift;
+        yshift = 0;
+    }
+
+    glDrawBuffer(GL_BACK);
+    glReadBuffer(GL_BACK);
+    glRasterPos2i((GLint)xshift, (GLint)yshift);
+    glDisable(GL_BLEND);
+    glCopyPixels(xorigin, yorigin, width, height, GL_COLOR);
+
+    glDrawBuffer(GL_FRONT);
+
+    return TRUE;
+}
+
+void
+grtoglPutBackingStore(MagWindow *w, Rect *area)
+{
+    unsigned int width, height;
+    int ybot, xbot;
+    Rect r;
+
+    // GLboolean result;
+    // GLint rasterpos[4];
+
+    if (w->w_backingStore == (ClientData)0) return;
+
+    GEO_EXPAND(area, 1, &r);
+    GeoClip(&r, &(w->w_screenArea));
+
+    /*
+    width = area->r_xtop - area->r_xbot;
+    height = area->r_ytop - area->r_ybot;
+
+    ybot = area->r_ybot;
+    xbot = area->r_xbot;
+    */
+
+    width = r.r_xtop - r.r_xbot;
+    height = r.r_ytop - r.r_ybot;
+    ybot = r.r_ybot;
+    xbot = r.r_xbot;
+
+    if (xbot < 0) {
+	width -= xbot;
+	xbot = 0;
+    }
+
+    if (ybot < 0) {
+	height -= ybot;
+	ybot = 0;
+    }
+
+    glReadBuffer(GL_FRONT);
+    glDrawBuffer(GL_BACK);
+    glRasterPos2i((GLint)xbot, (GLint)ybot);
+
+    /* Check for valid raster position */
+    // glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID, (GLboolean *)(&result));
+    // glGetIntegerv(GL_CURRENT_RASTER_POSITION, (GLint *)(&rasterpos[0]));
+
+    // TxPrintf("Raster valid = %d, position = %d %d %d %d\n",
+    //		(int)result, (int)rasterpos[0], (int)rasterpos[1],
+    //		(int)rasterpos[2], (int)rasterpos[3]);
+    // if (result == 0)
+    //     TxPrintf("Intended position = %d %d\n", xbot, ybot);
+
+    /* This area may need to be expanded by a pixel and/or      */
+    /* expanded by GrPixelCorrect to compensate for the OpenGL  */
+    /* coordinate system.                                       */
+
+    width--;
+    height--;
+
+    glDisable(GL_BLEND);
+    glCopyPixels(xbot, ybot, width, height, GL_COLOR);
+
+    glDrawBuffer(GL_FRONT);	/* Return to normal front rendering */
+}
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * GrTOGLReadPixel --
+ *
+ *	Read one pixel from the screen.
+ *
+ * Results:
+ *	An integer containing the pixel's color.
+ *
+ * Side effects:
+ *	none.
+ *
+ * ----------------------------------------------------------------------------
+ */
+
+int
+GrTOGLReadPixel (w, x, y)
+    MagWindow *w;
+    int x,y;		/* the location of a pixel in screen coords */
+{
+    return 0;		/* OpenGL has no such function, so return 0 */
+}
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * GrTOGLBitBlt --
+ *
+ *	Copy information in bit block transfers.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	changes the screen.
+ * ----------------------------------------------------------------------------
+ */
+
+void
+GrTOGLBitBlt(r, p)
+    Rect *r;
+    Point *p;
+{
+    glCopyPixels(r->r_xbot, r->r_ybot, r->r_xtop - r->r_xbot + 1,
+		r->r_ytop - r->r_ybot + 1, GL_COLOR);
+}
+
+#ifdef VECTOR_FONTS
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Technically, there should be no self-intersecting polygons in outline
+ * fonts.  However, decomposition of bezier curves into line segments
+ * may occasionally produce one, so it needs to be handled.
+ *----------------------------------------------------------------------
+ */
+
+void
+myCombine(GLdouble coords[3], GLdouble *vertex_data[4],
+          GLfloat weight[4], GLdouble **outData, void *dataptr)
+{
+    /* This needs to be free'd at the end of gluTessEndPolygon()! */
+    GLdouble *new = (GLdouble *)mallocMagic(2 * sizeof(GLdouble));
+    new[0] = coords[0];
+    new[1] = coords[1];
+    *outData = new;
+    /* Diagnostic */
+    TxError("Intersecting polygon in char \"%c\" at %g %g!\n", 
+	*((char *)dataptr), coords[0], coords[1]);
+}
+
+/*
+ *----------------------------------------------------------------------
+ * Draw a text character
+ * This routine differs from grtoglFillPolygon() in that it uses the
+ * glu library to handle non-convex polygons as may appear in font
+ * outlines.
+ *----------------------------------------------------------------------
+ */
+
+void
+grtoglDrawCharacter(clist, tc, pixsize)
+    FontChar *clist;
+    unsigned char tc;
+    int pixsize;
+{
+    Point *tp;
+    int np, nptotal;
+    int i, j;
+    static GLUtesselator *tess = NULL;
+    static GLdouble *v = NULL;
+    static int maxnp = 0;
+    FontChar *ccur;
+
+    if (pixsize < 5) return;	/* Label too small to be useful */
+
+    if (tess == NULL)
+    {
+	tess = gluNewTess();
+	gluTessCallback(tess, GLU_TESS_BEGIN, (_GLUfuncptr)glBegin);
+	gluTessCallback(tess, GLU_TESS_VERTEX, (_GLUfuncptr)glVertex3dv);
+	gluTessCallback(tess, GLU_TESS_END, (_GLUfuncptr)glEnd);
+	gluTessCallback(tess, GLU_TESS_COMBINE_DATA, (_GLUfuncptr)myCombine);
+    }
+    // Boundary-only does not look particularly good. . .
+    gluTessProperty(tess, GLU_TESS_BOUNDARY_ONLY, GL_FALSE);
+
+    nptotal = 0;
+    for (ccur = clist; ccur != NULL; ccur = ccur->fc_next)
+	nptotal += ccur->fc_numpoints;
+
+    if (nptotal > maxnp)
+    {
+	if (v != NULL) freeMagic((char *)v);
+	maxnp = nptotal;
+	v = (GLdouble *)mallocMagic(nptotal * 3 * sizeof(GLdouble));
+    }
+
+    j = 0;
+    for (ccur = clist; ccur != NULL; ccur = ccur->fc_next)
+    {
+	tp = ccur->fc_points;
+	np = ccur->fc_numpoints;
+
+	for (i = 0; i < np; i++, j += 3) {
+	    v[j] = tp[i].p_x;
+	    v[j + 1] = tp[i].p_y;
+	    v[j + 2] = 0;
+	}
+    }
+
+    gluTessBeginPolygon(tess, (GLvoid *)(&tc));
+    j = 0;
+    for (ccur = clist; ccur != NULL; ccur = ccur->fc_next)
+    {
+	np = ccur->fc_numpoints;
+	gluTessBeginContour(tess);
+	for (i = 0; i < np; i++, j += 3) {
+	    gluTessVertex(tess, &v[j], &v[j]);
+	}
+	gluTessEndContour(tess);
+    }
+    gluTessEndPolygon(tess);
+}
+
+/*---------------------------------------------------------
+ * grtoglFontText:
+ *
+ *	This routine draws text from font vectors using the
+ *	font vector routines in DBlabel.c.  Text is clipped
+ *	to the clipping rectangle.
+ *
+ *	For speed, we should be transferring the font
+ *	vectors into OpenGL display lists!
+ *	
+ *---------------------------------------------------------
+ */
+
+void
+grtoglFontText(text, font, size, rotate, pos, clip, obscure)
+    char *text;			/* The text to be drawn */
+    int   font;			/* Font to use from fontList */
+    int   size;			/* Pixel size of the font */
+    int	  rotate;		/* Text rotation */
+    Point *pos;			/* Text base position */
+    Rect  *clip;		/* Clipping area */
+    LinkedRect *obscure;	/* List of obscuring areas */ 
+{
+    char *tptr;
+    Point *coffset;		/* vector to next character */
+    Rect *cbbox;
+    GLfloat fsize, matvals[16];
+    FontChar *clist;
+    int cheight, baseline;
+    float tmp;
+
+    /* Keep it simple for now---ignore clip and obscure */
+
+    glDisable(GL_BLEND);
+    glPushMatrix();
+    glTranslated(pos->p_x, pos->p_y, 0);
+    glRotated(rotate, 0, 0, 1);
+
+    /* Get label size */
+    cbbox = &DBFontList[font]->mf_extents;
+
+    fsize = (GLfloat)size / (GLfloat)cbbox->r_ytop;
+    glScalef(fsize, fsize, 1.0);
+
+    /* Adjust to baseline */
+    baseline = 0;
+    for (tptr = text; *tptr != '\0'; tptr++)
+    {
+	DBFontChar(font, *tptr, NULL, NULL, &cbbox);
+	if (cbbox->r_ybot < baseline)
+	    baseline = cbbox->r_ybot;
+    }
+    glTranslated(0, -baseline, 0);
+
+    for (tptr = text; *tptr != '\0'; tptr++)
+    {
+	DBFontChar(font, *tptr, &clist, &coffset, NULL);
+	grtoglDrawCharacter(clist, *tptr, size);
+	glTranslated(coffset->p_x, coffset->p_y, 0);
+    }
+    glPopMatrix();
+}
+
+#endif /* VECTOR_FONTS */
+
+/*---------------------------------------------------------
+ * grtoglPutText:
+ *      (modified on SunPutText)
+ *
+ *	This routine puts a chunk of text on the screen in the current
+ *	color, size, etc.  The caller must ensure that it fits on
+ *	the screen -- no clipping is done except to the obscuring rectangle
+ *	list and the clip rectangle.
+ *
+ * Results:	
+ *	none.
+ *
+ * Side Effects:
+ *	The text is drawn on the screen.  
+ *
+ *---------------------------------------------------------
+ */
+
+void
+grtoglPutText (text, pos, clip, obscure)
+    char *text;			/* The text to be drawn. */
+    Point *pos;			/* A point located at the leftmost point of
+				 * the baseline for this string.
+				 */
+    Rect *clip;			/* A rectangle to clip against */
+    LinkedRect *obscure;	/* A list of obscuring rectangles */
+
+{
+    Rect location;
+    Rect overlap;
+    Rect textrect;
+    LinkedRect *ob;
+    void grTOGLGeoSub();
+    int i;
+    float tscale;
+
+    GrTOGLTextSize(text, toglCurrent.fontSize, &textrect);
+
+    location.r_xbot = pos->p_x + textrect.r_xbot;
+    location.r_xtop = pos->p_x + textrect.r_xtop;
+    location.r_ybot = pos->p_y + textrect.r_ybot;
+    location.r_ytop = pos->p_y + textrect.r_ytop;
+
+    /* erase parts of the bitmap that are obscured */
+    for (ob = obscure; ob != NULL; ob = ob->r_next)
+    {
+	if (GEO_TOUCH(&ob->r_r, &location))
+	{
+	    overlap = location;
+	    GeoClip(&overlap, &ob->r_r);
+	    grTOGLGeoSub(&location, &overlap);
+	}
+    }
+ 
+    overlap = location;
+    GeoClip(&overlap, clip);
+
+    /* copy the text to the color screen */
+    if ((overlap.r_xbot < overlap.r_xtop)&&(overlap.r_ybot <= overlap.r_ytop))
+    {
+	glScissor(overlap.r_xbot, overlap.r_ybot, overlap.r_xtop - overlap.r_xbot,
+		overlap.r_ytop - overlap.r_ybot);
+	glEnable(GL_SCISSOR_TEST);
+	glDisable(GL_BLEND);
+	glRasterPos2i(pos->p_x, pos->p_y);
+	glListBase(grXBases[(toglCurrent.fontSize == GR_TEXT_DEFAULT) ?
+		GR_TEXT_SMALL : toglCurrent.fontSize]);
+	glCallLists(strlen(text), GL_UNSIGNED_BYTE, (unsigned char *)text);
+	glDisable(GL_SCISSOR_TEST);
+    }
+}
+
+
+/* grTOGLGeoSub:
+ *	return the tallest sub-rectangle of r not obscured by area
+ *	area must be within r.
+ */
+
+void
+grTOGLGeoSub(r, area)
+Rect *r;		/* Rectangle to be subtracted from. */
+Rect *area;		/* Area to be subtracted. */
+
+{
+    if (r->r_xbot == area->r_xbot) r->r_xbot = area->r_xtop;
+    else
+    if (r->r_xtop == area->r_xtop) r->r_xtop = area->r_xbot;
+    else
+    if (r->r_ybot <= area->r_ybot) r->r_ybot = area->r_ytop;
+    else
+    if (r->r_ytop == area->r_ytop) r->r_ytop = area->r_ybot;
+    else
+    r->r_xtop = area->r_xbot;
+}
diff --git a/graphics/grTk1.c b/graphics/grTk1.c
index 76a595f3..3c5aa13a 100644
--- a/graphics/grTk1.c
+++ b/graphics/grTk1.c
@@ -1114,7 +1114,9 @@ keys_and_buttons:
 		if (mw->w_backingStore != (ClientData)NULL)
 		{
 		    Rect surface;
+		    (*GrLockPtr)(mw, FALSE);
 		    (*GrGetBackingStorePtr)(mw, &screenRect);
+		    (*GrUnlockPtr)(mw);
 		    WindScreenToSurface(mw, &screenRect, &surface);
 		    DBWHLRedrawPrepWindow(mw, &surface);
 		    WindDrawBorder(mw, &screenRect);
diff --git a/graphics/grX11su1.c b/graphics/grX11su1.c
index 17319799..054d2e13 100644
--- a/graphics/grX11su1.c
+++ b/graphics/grX11su1.c
@@ -841,7 +841,9 @@ grX11Stdin()
 		    if (w->w_backingStore != (ClientData)NULL)
 		    {
 			Rect surface;
+			(*GrLockPtr)(w, FALSE);
 			(*GrGetBackingStorePtr)(w, &screenRect);
+			(*GrUnlockPtr)(w);
 			WindScreenToSurface(w, &screenRect, &surface);
 			DBWHLRedrawPrepWindow(w, &surface);
 			WindDrawBorder(w, &screenRect);
diff --git a/scripts/config.log b/scripts/config.log
index 278434fe..f7a4d99e 100644
--- a/scripts/config.log
+++ b/scripts/config.log
@@ -4,7 +4,7 @@ running configure, to aid debugging if configure makes a mistake.
 It was created by configure, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
-  $ ./configure --enable-cairo-offscreen
+  $ ./configure 
 
 ## --------- ##
 ## Platform. ##
@@ -125,7 +125,7 @@ configure: failed program was:
 | #define PACKAGE_BUGREPORT ""
 | #define PACKAGE_URL ""
 | #define MAGIC_VERSION "8.2"
-| #define MAGIC_REVISION "27"
+| #define MAGIC_REVISION "29"
 | /* end confdefs.h.  */
 | #include <ac_nonexistent.h>
 configure:3474: result: gcc -E
@@ -146,7 +146,7 @@ configure: failed program was:
 | #define PACKAGE_BUGREPORT ""
 | #define PACKAGE_URL ""
 | #define MAGIC_VERSION "8.2"
-| #define MAGIC_REVISION "27"
+| #define MAGIC_REVISION "29"
 | /* end confdefs.h.  */
 | #include <ac_nonexistent.h>
 configure:3594: checking for g++
@@ -302,7 +302,7 @@ configure: failed program was:
 | #define PACKAGE_BUGREPORT ""
 | #define PACKAGE_URL ""
 | #define MAGIC_VERSION "8.2"
-| #define MAGIC_REVISION "27"
+| #define MAGIC_REVISION "29"
 | #define STDC_HEADERS 1
 | #define HAVE_SYS_TYPES_H 1
 | #define HAVE_SYS_STAT_H 1
@@ -343,7 +343,7 @@ configure: failed program was:
 | #define PACKAGE_BUGREPORT ""
 | #define PACKAGE_URL ""
 | #define MAGIC_VERSION "8.2"
-| #define MAGIC_REVISION "27"
+| #define MAGIC_REVISION "29"
 | #define STDC_HEADERS 1
 | #define HAVE_SYS_TYPES_H 1
 | #define HAVE_SYS_STAT_H 1
@@ -433,7 +433,7 @@ configure: failed program was:
 | #define PACKAGE_BUGREPORT ""
 | #define PACKAGE_URL ""
 | #define MAGIC_VERSION "8.2"
-| #define MAGIC_REVISION "27"
+| #define MAGIC_REVISION "29"
 | #define STDC_HEADERS 1
 | #define HAVE_SYS_TYPES_H 1
 | #define HAVE_SYS_STAT_H 1
@@ -506,7 +506,7 @@ configure: failed program was:
 | #define PACKAGE_BUGREPORT ""
 | #define PACKAGE_URL ""
 | #define MAGIC_VERSION "8.2"
-| #define MAGIC_REVISION "27"
+| #define MAGIC_REVISION "29"
 | #define STDC_HEADERS 1
 | #define HAVE_SYS_TYPES_H 1
 | #define HAVE_SYS_STAT_H 1
@@ -651,8 +651,8 @@ generated by GNU Autoconf 2.69.  Invocation command line was
 
 on stravinsky
 
-config.status:800: creating defs.mak
-config.status:903: WARNING:  'defs.mak.in' seems to ignore the --datarootdir setting
+config.status:799: creating defs.mak
+config.status:902: WARNING:  'defs.mak.in' seems to ignore the --datarootdir setting
 
 ## ---------------- ##
 ## Cache variables. ##
@@ -759,7 +759,7 @@ CPPFLAGS=''
 CSH='/bin/csh'
 CXX='g++'
 CXXFLAGS='-g -O2'
-DEFS='-DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DMAGIC_VERSION=\"8.2\" -DMAGIC_REVISION=\"27\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DSIZEOF_VOID_P=8 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_UNSIGNED_LONG_LONG=8 -DSTDC_HEADERS=1 -DHAVE_SETENV=1 -DHAVE_PUTENV=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_DIRENT_H=1 -DHAVE_LIMITS_H=1 -DHAVE_PATHS_H=1 -DHAVE_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DX11_BACKING_STORE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -DUSE_NEW_MACROS=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DCAIRO_OFFSCREEN_RENDER=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux=1 -DSYSV=1 -DISC=1'
+DEFS='-DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DMAGIC_VERSION=\"8.2\" -DMAGIC_REVISION=\"29\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DSIZEOF_VOID_P=8 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_UNSIGNED_LONG_LONG=8 -DSTDC_HEADERS=1 -DHAVE_SETENV=1 -DHAVE_PUTENV=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_DIRENT_H=1 -DHAVE_LIMITS_H=1 -DHAVE_PATHS_H=1 -DHAVE_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -DUSE_NEW_MACROS=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux=1 -DSYSV=1 -DISC=1'
 DEPEND_FLAG='-MM'
 ECHO_C=''
 ECHO_N='printf'
@@ -783,7 +783,7 @@ LIBS='-lcairo -lGLU -lGL '
 LIB_SPECS=' -L/usr/lib64 -ltk8.6 -L/usr/lib64 -ltcl8.6'
 LTLIBOBJS=''
 M4='/bin/m4'
-MAGIC_REVISION='27'
+MAGIC_REVISION='29'
 MAGIC_VERSION='8.2'
 MCPP='${MAGICDIR}/scripts/preproc.py'
 OA=''
@@ -884,7 +884,7 @@ unused=' readline lisp'
 #define PACKAGE_BUGREPORT ""
 #define PACKAGE_URL ""
 #define MAGIC_VERSION "8.2"
-#define MAGIC_REVISION "27"
+#define MAGIC_REVISION "29"
 #define STDC_HEADERS 1
 #define HAVE_SYS_TYPES_H 1
 #define HAVE_SYS_STAT_H 1
@@ -911,7 +911,6 @@ unused=' readline lisp'
 #define FILE_LOCKS 1
 #define CALMA_MODULE 1
 #define CIF_MODULE 1
-#define X11_BACKING_STORE 1
 #define PLOT_MODULE 1
 #define LEF_MODULE 1
 #define ROUTE_MODULE 1
@@ -920,7 +919,6 @@ unused=' readline lisp'
 #define HAVE_LIBGLU 1
 #define VECTOR_FONTS 1
 #define HAVE_LIBCAIRO 1
-#define CAIRO_OFFSCREEN_RENDER 1
 #define MAGIC_WRAPPER 1
 #define THREE_D 1
 #define linux 1
diff --git a/scripts/config.status b/scripts/config.status
index 64bf572e..7516ef4f 100755
--- a/scripts/config.status
+++ b/scripts/config.status
@@ -417,7 +417,7 @@ $config_files
 
 Report bugs to the package provider."
 
-ac_cs_config="'--enable-cairo-offscreen' 'CFLAGS=-g'"
+ac_cs_config="'CFLAGS=-g'"
 ac_cs_version="\
 config.status
 configured by ./configure, generated by GNU Autoconf 2.69,
@@ -496,7 +496,7 @@ if $ac_cs_silent; then
 fi
 
 if $ac_cs_recheck; then
-  set X /bin/sh './configure'  '--enable-cairo-offscreen' 'CFLAGS=-g' $ac_configure_extra_args --no-create --no-recursion
+  set X /bin/sh './configure'  'CFLAGS=-g' $ac_configure_extra_args --no-create --no-recursion
   shift
   $as_echo "running CONFIG_SHELL=/bin/sh $*" >&6
   CONFIG_SHELL='/bin/sh'
@@ -588,7 +588,7 @@ S["INSTALL_TARGET"]="install-tcl"
 S["ALL_TARGET"]="tcl"
 S["OA_LIBS"]=""
 S["OA"]=""
-S["MAGIC_REVISION"]="27"
+S["MAGIC_REVISION"]="29"
 S["MAGIC_VERSION"]="8.2"
 S["SCPP"]="gcc -E -x c"
 S["MCPP"]="${MAGICDIR}/scripts/preproc.py"
@@ -674,12 +674,11 @@ S["ECHO_T"]=""
 S["ECHO_N"]="-n"
 S["ECHO_C"]=""
 S["DEFS"]="-DPACKAGE_NAME=\\\"\\\" -DPACKAGE_TARNAME=\\\"\\\" -DPACKAGE_VERSION=\\\"\\\" -DPACKAGE_STRING=\\\"\\\" -DPACKAGE_BUGREPORT=\\\"\\\" -DPACKAGE_URL=\\\"\\\" -DMAGIC_VERSION="\
-"\\\"8.2\\\" -DMAGIC_REVISION=\\\"27\\\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHA"\
+"\\\"8.2\\\" -DMAGIC_REVISION=\\\"29\\\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHA"\
 "VE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DSIZEOF_VOID_P=8 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_U"\
 "NSIGNED_LONG_LONG=8 -DSTDC_HEADERS=1 -DHAVE_SETENV=1 -DHAVE_PUTENV=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_DIRENT_H=1 -DHAVE_LIMITS_H=1 -DHAVE_PATHS_H=1 -DHAVE"\
-"_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DX11_BACKING_STORE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -"\
-"DUSE_NEW_MACROS=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DCAIRO_OFFSCREEN_RENDER=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux"\
-"=1 -DSYSV=1 -DISC=1"
+"_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -DUSE_NEW_MACROS=1 -DHA"\
+"VE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux=1 -DSYSV=1 -DISC=1"
 S["mandir"]="${datarootdir}/man"
 S["localedir"]="${datarootdir}/locale"
 S["libdir"]="${exec_prefix}/lib"
diff --git a/scripts/configure b/scripts/configure
index c2363817..cd936d97 100755
--- a/scripts/configure
+++ b/scripts/configure
@@ -1408,7 +1408,7 @@ Optional Features:
   --disable-cif        disable cif package
   --disable-client-render        disable OpenGL client-side rendering
   --enable-invert-y        invert screen top to bottom in OpenGL
-  --enable-framebuffer-backing-store     enable OpenGL framebuffer backing store
+  --disable-framebuffer-backing-store     disable OpenGL framebuffer backing store
   --disable-plot	disable plot package
   --disable-lef	disable LEF package
   --disable-readline	disable readline package
@@ -6942,7 +6942,7 @@ fi
 if test "${enable_framebuffer_backing_store+set}" = set; then :
   enableval=$enable_framebuffer_backing_store;
 else
-  enable_framebuffer_backing_store=no
+  enable_framebuffer_backing_store=yes
 fi
 
 
diff --git a/scripts/configure.in b/scripts/configure.in
index 37b60534..d70e98ee 100644
--- a/scripts/configure.in
+++ b/scripts/configure.in
@@ -975,9 +975,9 @@ if test "x$enable_invert_y" = "xyes" ; then
 fi
 
 AC_ARG_ENABLE(framebuffer-backing-store,
-[  --enable-framebuffer-backing-store     enable OpenGL framebuffer backing store],
+[  --disable-framebuffer-backing-store     disable OpenGL framebuffer backing store],
 [], 
-[enable_framebuffer_backing_store=no])
+[enable_framebuffer_backing_store=yes])
 
 if test "x$enable_framebuffer_backing_store" != "xyes" ; then
   AC_DEFINE(X11_BACKING_STORE)
diff --git a/scripts/defs.mak b/scripts/defs.mak
index 7c95e6a0..07220479 100644
--- a/scripts/defs.mak
+++ b/scripts/defs.mak
@@ -61,14 +61,14 @@ LIB_SPECS	       =  -L/usr/lib64 -ltk8.6 -L/usr/lib64 -ltcl8.6
 WISH_EXE	       = /usr/bin/wish
 TCL_LIB_DIR	       = /usr/lib
 MAGIC_VERSION	       = 8.2
-MAGIC_REVISION	       = 27
+MAGIC_REVISION	       = 29
 
 CC                     = gcc
 CPP                    = gcc -E
 CXX		       = g++
 
 CPPFLAGS               = -I. -I${MAGICDIR} 
-DFLAGS                 =  -DCAD_DIR=\"${LIBDIR}\" -DBIN_DIR=\"${BINDIR}\" -DTCL_DIR=\"${TCLDIR}\" -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DMAGIC_VERSION=\"8.2\" -DMAGIC_REVISION=\"27\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DSIZEOF_VOID_P=8 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_UNSIGNED_LONG_LONG=8 -DSTDC_HEADERS=1 -DHAVE_SETENV=1 -DHAVE_PUTENV=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_DIRENT_H=1 -DHAVE_LIMITS_H=1 -DHAVE_PATHS_H=1 -DHAVE_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DX11_BACKING_STORE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -DUSE_NEW_MACROS=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DCAIRO_OFFSCREEN_RENDER=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux=1 -DSYSV=1 -DISC=1 -DNDEBUG -DGCORE=\"/bin/gcore\"
+DFLAGS                 =  -DCAD_DIR=\"${LIBDIR}\" -DBIN_DIR=\"${BINDIR}\" -DTCL_DIR=\"${TCLDIR}\" -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DMAGIC_VERSION=\"8.2\" -DMAGIC_REVISION=\"29\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DSIZEOF_VOID_P=8 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_UNSIGNED_LONG_LONG=8 -DSTDC_HEADERS=1 -DHAVE_SETENV=1 -DHAVE_PUTENV=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_DIRENT_H=1 -DHAVE_LIMITS_H=1 -DHAVE_PATHS_H=1 -DHAVE_VA_COPY=1 -DHAVE___VA_COPY=1 -DFILE_LOCKS=1 -DCALMA_MODULE=1 -DCIF_MODULE=1 -DPLOT_MODULE=1 -DLEF_MODULE=1 -DROUTE_MODULE=1 -DUSE_NEW_MACROS=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DVECTOR_FONTS=1 -DHAVE_LIBCAIRO=1 -DMAGIC_WRAPPER=1 -DTHREE_D=1 -Dlinux=1 -DSYSV=1 -DISC=1 -DNDEBUG -DGCORE=\"/bin/gcore\"
 DFLAGS		      += -DSHDLIB_EXT=\".so\"
 CFLAGS                 = -g -m64 -fPIC -Wimplicit-int -fPIC 
 
diff --git a/windows/windView.c b/windows/windView.c
index 9b98d76e..e535dcc9 100644
--- a/windows/windView.c
+++ b/windows/windView.c
@@ -492,8 +492,10 @@ WindScroll(w, surfaceOffset, screenOffset)
 	    norefresh.r_ytop += moveorigin.p_y;
 	}
 
+	GrLock(w, FALSE);
 	(*GrScrollBackingStorePtr)(w, &moveorigin);
 	(*GrGetBackingStorePtr)(w, &norefresh);
+	GrUnlock(w);
 	WindAreaChanged(w, &refresh);
 	/* Update highlights over entire screen area */
 	DBWHLRedrawPrepWindow(w, &(w->w_surfaceArea));