GLwDrawA.c

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/*
 * (c) Copyright 1993, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
 * Permission to use, copy, modify, and distribute this software for
 * any purpose and without fee is hereby granted, provided that the above
 * copyright notice appear in all copies and that both the copyright notice
 * and this permission notice appear in supporting documentation, and that
 * the name of Silicon Graphics, Inc. not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.
 *
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *
 * US Government Users Restricted Rights
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
 * clause at DFARS 252.227-7013 and/or in similar or successor
 * clauses in the FAR or the DOD or NASA FAR Supplement.
 * Unpublished-- rights reserved under the copyright laws of the
 * United States.  Contractor/manufacturer is Silicon Graphics,
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
 *
 * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
 */

/* This file has been slightly modified from the original for use with Mesa
 *     Jeroen van der Zijp (jvz@cyberia.cfdrc.com)
 */

// This file has been modified for use with ARB

#ifndef __GLX_MOTIF
#error ARB only needs the Motif flavour of this file
#endif
#define USE(x) (x)=(x)

#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
// #include <GL/glx.h>
// #include <GL/gl.h>
#ifdef __GLX_MOTIF
#include <Xm/PrimitiveP.h>
#include "GLwMDrawAP.h"
#else
#include "GLwDrawAP.h"
#endif
#include <assert.h>
#include <stdio.h>

#ifdef __GLX_MOTIF
#define GLwDrawingAreaWidget      GLwMDrawingAreaWidget
#define GLwDrawingAreaClassRec    GLwMDrawingAreaClassRec
#define glwDrawingAreaClassRec    glwMDrawingAreaClassRec
#define glwDrawingAreaWidgetClass glwMDrawingAreaWidgetClass
#define GLwDrawingAreaRec         GLwMDrawingAreaRec
#endif

#define ATTRIBLIST_SIZE 32

#define offset(field) XtOffset(GLwDrawingAreaWidget, glwDrawingArea.field)


// forward definitions
static void createColormap(GLwDrawingAreaWidget w, int offset, XrmValue *value);
static void Initialize(GLwDrawingAreaWidget req, GLwDrawingAreaWidget neww, ArgList args, Cardinal *num_args);
static void Realize(Widget w, Mask *valueMask, XSetWindowAttributes *attributes);
static void Redraw(GLwDrawingAreaWidget w, XEvent *event, Region region);
static void Resize(GLwDrawingAreaWidget glw);
static void Destroy(GLwDrawingAreaWidget glw);
static void glwInput(GLwDrawingAreaWidget glw, XEvent *event, String *params, Cardinal *numParams);



static char defaultTranslations[] =
#ifdef __GLX_MOTIF
     "<Key>osfHelp:PrimitiveHelp() \n"
#endif
    "<KeyDown>:   glwInput() \n"
    "<KeyUp>:     glwInput() \n"
    "<BtnDown>:   glwInput() \n"
    "<BtnUp>:     glwInput() \n"
    "<BtnMotion>: glwInput() ";


static XtActionsRec actions[] = {
    { (String)"glwInput", (XtActionProc)glwInput },             // key or mouse input
  };


/*
 * There is a bit of unusual handling of the resources here.
 * Because Xt insists on allocating the colormap resource when it is
 * processing the core resources (even if we redeclare the colormap
 * resource here, we need to do a little trick.  When Xt first allocates
 * the colormap, we allow it to allocate the default one, since we have
 * not yet determined the appropriate visual (which is determined from
 * resources parsed after the colormap).  We also let it allocate colors
 * in that default colormap.
 *
 * In the initialize proc we calculate the actual visual.  Then, we
 * reobtain the colormap resource using XtGetApplicationResources in
 * the initialize proc.  If requested, we also reallocate colors in
 * that colormap using the same method.
 */

static XtResource resources[] = {
  // The GLX attributes.  Add any new attributes here

    { (String)GLwNbufferSize,    (String)GLwCBufferSize,     XtRInt,     sizeof(int),     offset(bufferSize),     XtRImmediate, (XtPointer)0 },
    { (String)GLwNlevel,         (String)GLwCLevel,          XtRInt,     sizeof(int),     offset(level),          XtRImmediate, (XtPointer)0 },
    { (String)GLwNrgba,          (String)GLwCRgba,           XtRBoolean, sizeof(Boolean), offset(rgba),           XtRImmediate, (XtPointer)FALSE },
    { (String)GLwNdoublebuffer,  (String)GLwCDoublebuffer,   XtRBoolean, sizeof(Boolean), offset(doublebuffer),   XtRImmediate, (XtPointer)FALSE },
    { (String)GLwNstereo,        (String)GLwCStereo,         XtRBoolean, sizeof(Boolean), offset(stereo),         XtRImmediate, (XtPointer)FALSE },
    { (String)GLwNauxBuffers,    (String)GLwCAuxBuffers,     XtRInt,     sizeof(int),     offset(auxBuffers),     XtRImmediate, (XtPointer)0 },
    { (String)GLwNredSize,       (String)GLwCColorSize,      XtRInt,     sizeof(int),     offset(redSize),        XtRImmediate, (XtPointer)1 },
    { (String)GLwNgreenSize,     (String)GLwCColorSize,      XtRInt,     sizeof(int),     offset(greenSize),      XtRImmediate, (XtPointer)1 },
    { (String)GLwNblueSize,      (String)GLwCColorSize,      XtRInt,     sizeof(int),     offset(blueSize),       XtRImmediate, (XtPointer)1 },
    { (String)GLwNalphaSize,     (String)GLwCAlphaSize,      XtRInt,     sizeof(int),     offset(alphaSize),      XtRImmediate, (XtPointer)0 },
    { (String)GLwNdepthSize,     (String)GLwCDepthSize,      XtRInt,     sizeof(int),     offset(depthSize),      XtRImmediate, (XtPointer)0 },
    { (String)GLwNstencilSize,   (String)GLwCStencilSize,    XtRInt,     sizeof(int),     offset(stencilSize),    XtRImmediate, (XtPointer)0 },
    { (String)GLwNaccumRedSize,  (String)GLwCAccumColorSize, XtRInt,     sizeof(int),     offset(accumRedSize),   XtRImmediate, (XtPointer)0 },
    { (String)GLwNaccumGreenSize, (String)GLwCAccumColorSize, XtRInt,    sizeof(int),     offset(accumGreenSize), XtRImmediate, (XtPointer)0 },
    { (String)GLwNaccumBlueSize, (String)GLwCAccumColorSize, XtRInt,     sizeof(int),     offset(accumBlueSize),  XtRImmediate, (XtPointer)0 },
    { (String)GLwNaccumAlphaSize, (String)GLwCAccumAlphaSize, XtRInt,    sizeof(int),     offset(accumAlphaSize), XtRImmediate, (XtPointer)0 },

  // the attribute list
    { (String)GLwNattribList, (String)GLwCAttribList, XtRPointer, sizeof(int *), offset(attribList), XtRImmediate, (XtPointer) NULL },

  // the visual info
    { (String)GLwNvisualInfo, (String)GLwCVisualInfo, (String)GLwRVisualInfo, sizeof (XVisualInfo *), offset(visualInfo), XtRImmediate, (XtPointer) NULL },

  // miscellaneous resources
    { (String)GLwNinstallColormap,    (String)GLwCInstallColormap,   XtRBoolean,  sizeof(Boolean),        offset(installColormap),     XtRImmediate, (XtPointer)TRUE },
    { (String)GLwNallocateBackground, (String)GLwCAllocateColors,    XtRBoolean,  sizeof(Boolean),        offset(allocateBackground),  XtRImmediate, (XtPointer)FALSE },
    { (String)GLwNallocateOtherColors, (String)GLwCAllocateColors,   XtRBoolean,  sizeof(Boolean),        offset(allocateOtherColors), XtRImmediate, (XtPointer)FALSE },
    { (String)GLwNinstallBackground,  (String)GLwCInstallBackground, XtRBoolean,  sizeof(Boolean),        offset(installBackground),   XtRImmediate, (XtPointer)TRUE },
    { (String)GLwNginitCallback,      (String)GLwCCallback,          XtRCallback, sizeof(XtCallbackList), offset(ginitCallback),       XtRImmediate, (XtPointer)NULL },
    { (String)GLwNinputCallback,      (String)GLwCCallback,          XtRCallback, sizeof(XtCallbackList), offset(inputCallback),       XtRImmediate, (XtPointer)NULL },
    { (String)GLwNresizeCallback,     (String)GLwCCallback,          XtRCallback, sizeof(XtCallbackList), offset(resizeCallback),      XtRImmediate, (XtPointer)NULL },
    { (String)GLwNexposeCallback,     (String)GLwCCallback,          XtRCallback, sizeof(XtCallbackList), offset(exposeCallback),      XtRImmediate, (XtPointer)NULL },

  // Changes to Motif primitive resources
#ifdef __GLX_MOTIF
    { (String)XmNtraversalOn, (String)XmCTraversalOn, XmRBoolean, sizeof (Boolean), XtOffset (GLwDrawingAreaWidget, primitive.traversal_on), XmRImmediate, (XtPointer)FALSE },

  /* highlighting is normally disabled, as when Motif tries to disable
   * highlighting, it tries to reset the color back to the parent's
   * background (usually Motif blue).  Unfortunately, that is in a
   * different colormap, and doesn't work too well.
   */
    { (String)XmNhighlightOnEnter,  (String)XmCHighlightOnEnter,   XmRBoolean,             sizeof(Boolean),   XtOffset(GLwDrawingAreaWidget, primitive.highlight_on_enter),  XmRImmediate, (XtPointer)FALSE },
    { (String)XmNhighlightThickness, (String)XmCHighlightThickness, XmRHorizontalDimension, sizeof(Dimension), XtOffset(GLwDrawingAreaWidget, primitive.highlight_thickness), XmRImmediate, (XtPointer)0 },
#endif
  };


/*
** The following resources are reobtained using XtGetApplicationResources
** in the initialize proc.
*/

// The colormap
static XtResource initializeResources[] = {
  // reobtain the colormap with the new visual
  { XtNcolormap, XtCColormap, XtRColormap, sizeof(Colormap),
   XtOffset(GLwDrawingAreaWidget, core.colormap),
   XtRCallProc, (XtPointer) createColormap },
  };


// reallocate any colors we need in the new colormap

// The background is obtained only if the allocateBackground resource is TRUE
static XtResource backgroundResources[] = {
#ifdef __GLX_MOTIF
  { XmNbackground, XmCBackground, XmRPixel,
   sizeof(Pixel), XtOffset(GLwDrawingAreaWidget, core.background_pixel),
   XmRString, (XtPointer)"lightgrey" },

  { XmNbackgroundPixmap, XmCPixmap, XmRXmBackgroundPixmap,
   sizeof(Pixmap), XtOffset(GLwDrawingAreaWidget, core.background_pixmap),
   XmRImmediate, (XtPointer)XmUNSPECIFIED_PIXMAP },

#else
  { XtNbackground, XtCBackground, XtRPixel, sizeof(Pixel),
   XtOffset(GLwDrawingAreaWidget, core.background_pixel),
   XtRString, (XtPointer)"lightgrey" },

  { XtNbackgroundPixmap, XtCPixmap, XtRPixmap, sizeof(Pixmap),
   XtOffset(GLwDrawingAreaWidget, core.background_pixmap),
   XtRImmediate, (XtPointer)XtUnspecifiedPixmap },
#endif
  };



/* The other colors such as the foreground are allocated only if
 * allocateOtherColors are set.  These resources only exist in Motif.
 */
#ifdef __GLX_MOTIF
static XtResource otherColorResources[] = {
  { XmNforeground, XmCForeground, XmRPixel,
   sizeof(Pixel), XtOffset(GLwDrawingAreaWidget, primitive.foreground),
   XmRString, (XtPointer)"lighgrey" },

  { XmNhighlightColor, XmCHighlightColor, XmRPixel, sizeof(Pixel),
   XtOffset(GLwDrawingAreaWidget, primitive.highlight_color),
   XmRString, (XtPointer)"lightgrey" },

  { XmNhighlightPixmap, XmCHighlightPixmap, XmRPrimHighlightPixmap,
   sizeof(Pixmap),
   XtOffset(GLwDrawingAreaWidget, primitive.highlight_pixmap),
   XmRImmediate, (XtPointer)XmUNSPECIFIED_PIXMAP },
  };
#endif


#undef offset


GLwDrawingAreaClassRec glwDrawingAreaClassRec = {
  { // core fields
#ifdef __GLX_MOTIF
    /* superclass                */        (WidgetClass) &xmPrimitiveClassRec,
    /* class_name                */        (String)"GLwMDrawingArea",
#else // not __GLX_MOTIF
    /* superclass                */        (WidgetClass) &widgetClassRec,
    /* class_name                */        (String)"GLwDrawingArea",
#endif // __GLX_MOTIF
    /* widget_size               */        sizeof(GLwDrawingAreaRec),
    /* class_initialize          */        NULL,
    /* class_part_initialize     */        NULL,
    /* class_inited              */        FALSE,
    /* initialize                */        (XtInitProc) Initialize,
    /* initialize_hook           */        NULL,
    /* realize                   */        Realize,
    /* actions                   */        actions,
    /* num_actions               */        XtNumber(actions),
    /* resources                 */        resources,
    /* num_resources             */        XtNumber(resources),
    /* xrm_class                 */        NULLQUARK,
    /* compress_motion           */        TRUE,
    /* compress_exposure         */        TRUE,
    /* compress_enterleave       */        TRUE,
    /* visible_interest          */        TRUE,
    /* destroy                   */        (XtWidgetProc) Destroy,
    /* resize                    */        (XtWidgetProc) Resize,
    /* expose                    */        (XtExposeProc) Redraw,
    /* set_values                */        NULL,
    /* set_values_hook           */        NULL,
    /* set_values_almost         */        XtInheritSetValuesAlmost,
    /* get_values_hook           */        NULL,
    /* accept_focus              */        NULL,
    /* version                   */        XtVersion,
    /* callback_private          */        NULL,
    /* tm_table                  */        defaultTranslations,
    /* query_geometry            */        XtInheritQueryGeometry,
    /* display_accelerator       */        XtInheritDisplayAccelerator,
    /* extension                 */        NULL
  },
#ifdef __GLX_MOTIF // primitive resources (XmPrimitiveClassPart)
  {
    /* border_highlight          */        XmInheritBorderHighlight,
    /* border_unhighlight        */        XmInheritBorderUnhighlight,
    /* translations              */        XtInheritTranslations,
    /* arm_and_activate          */        NULL,
    /* get_resources             */        NULL,
    /* num get_resources         */        0,
    /* extension                 */        NULL,
  },
#endif
  { NULL },
};

WidgetClass glwDrawingAreaWidgetClass=(WidgetClass)&glwDrawingAreaClassRec;



static void error(Widget w, const char* string) {
  char buf[100];
#ifdef __GLX_MOTIF
  sprintf(buf, "GLwMDrawingArea: %s\n", string);
#else
  sprintf(buf, "GLwDrawingArea: %s\n", string);
#endif
  XtAppError(XtWidgetToApplicationContext(w), buf);
  }


static void warning(Widget w, const char* string) {
  char buf[100];
#ifdef __GLX_MOTIF
  sprintf (buf, "GLwMDraw: %s\n", string);
#else
  sprintf (buf, "GLwDraw: %s\n", string);
#endif
  XtAppWarning(XtWidgetToApplicationContext(w), buf);
  }



// Initialize the attribList based on the attributes
static void createAttribList(GLwDrawingAreaWidget w) {
  int *ptr;
  w->glwDrawingArea.attribList = (int*)XtMalloc(ATTRIBLIST_SIZE*sizeof(int));
  if (!w->glwDrawingArea.attribList) {
    error((Widget)w, "Unable to allocate attribute list");
    }
  ptr = w->glwDrawingArea.attribList;
  *ptr++ = GLX_BUFFER_SIZE;
  *ptr++ = w->glwDrawingArea.bufferSize;
  *ptr++ = GLX_LEVEL;
  *ptr++ = w->glwDrawingArea.level;
  if (w->glwDrawingArea.rgba) *ptr++ = GLX_RGBA;
  if (w->glwDrawingArea.doublebuffer) *ptr++ = GLX_DOUBLEBUFFER;
  if (w->glwDrawingArea.stereo) *ptr++ = GLX_STEREO;
  *ptr++ = GLX_AUX_BUFFERS;
  *ptr++ = w->glwDrawingArea.auxBuffers;
  *ptr++ = GLX_RED_SIZE;
  *ptr++ = w->glwDrawingArea.redSize;
  *ptr++ = GLX_GREEN_SIZE;
  *ptr++ = w->glwDrawingArea.greenSize;
  *ptr++ = GLX_BLUE_SIZE;
  *ptr++ = w->glwDrawingArea.blueSize;
  *ptr++ = GLX_ALPHA_SIZE;
  *ptr++ = w->glwDrawingArea.alphaSize;
  *ptr++ = GLX_DEPTH_SIZE;
  *ptr++ = w->glwDrawingArea.depthSize;
  *ptr++ = GLX_STENCIL_SIZE;
  *ptr++ = w->glwDrawingArea.stencilSize;
  *ptr++ = GLX_ACCUM_RED_SIZE;
  *ptr++ = w->glwDrawingArea.accumRedSize;
  *ptr++ = GLX_ACCUM_GREEN_SIZE;
  *ptr++ = w->glwDrawingArea.accumGreenSize;
  *ptr++ = GLX_ACCUM_BLUE_SIZE;
  *ptr++ = w->glwDrawingArea.accumBlueSize;
  *ptr++ = GLX_ACCUM_ALPHA_SIZE;
  *ptr++ = w->glwDrawingArea.accumAlphaSize;
  *ptr++ = None;
  assert((ptr-w->glwDrawingArea.attribList)<ATTRIBLIST_SIZE);
  }



// Initialize the visualInfo based on the attribute list
static void createVisualInfo(GLwDrawingAreaWidget w) {
  assert(w->glwDrawingArea.attribList);
  w->glwDrawingArea.visualInfo=glXChooseVisual(XtDisplay(w), XScreenNumberOfScreen(XtScreen(w)), w->glwDrawingArea.attribList);
  if (!w->glwDrawingArea.visualInfo) error((Widget)w, "requested visual not supported");
  }



/* Initialize the colormap based on the visual info.
 * This routine maintains a cache of visual-infos to colormaps.  If two
 * widgets share the same visual info, they share the same colormap.
 * This function is called by the callProc of the colormap resource entry.
 */
static void createColormap(GLwDrawingAreaWidget w, int offset, XrmValue *value) {
  static struct cmapCache { Visual *visual; Colormap cmap; } *cmapCache;
  static int cacheEntries=0;
  static int cacheMalloced=0;
  int i;

  USE(offset);

  assert(w->glwDrawingArea.visualInfo);

  // see if we can find it in the cache
  for (i=0; i<cacheEntries; i++) {
    if (cmapCache[i].visual==w->glwDrawingArea.visualInfo->visual) {
      value->addr=(XtPointer)(&cmapCache[i].cmap);
      return;
      }
    }

  // not in the cache, create a new entry
  if (cacheEntries >= cacheMalloced) {
    /* need to malloc a new one.  Since we are likely to have only a
     * few colormaps, we allocate one the first time, and double
     * each subsequent time.
     */
    if (cacheMalloced==0) {
      cacheMalloced=1;
      cmapCache=(struct cmapCache*)XtMalloc(sizeof(struct cmapCache));
      }
    else {
      cacheMalloced<<=1;
      cmapCache=(struct cmapCache*)XtRealloc((char*)cmapCache, sizeof(struct cmapCache)*cacheMalloced);
      }
    }

  cmapCache[cacheEntries].cmap=XCreateColormap(XtDisplay(w),
                                               RootWindow(XtDisplay(w),
                                               w->glwDrawingArea.visualInfo->screen),
                                               w->glwDrawingArea.visualInfo->visual,
                                               AllocNone);
  cmapCache[cacheEntries].visual=w->glwDrawingArea.visualInfo->visual;
  value->addr=(XtPointer)(&cmapCache[cacheEntries++].cmap);
  }



static void Initialize(GLwDrawingAreaWidget req, GLwDrawingAreaWidget neww, ArgList args, Cardinal *num_args) {

  // fix size
  if (req->core.width==0) neww->core.width=100;
  if (req->core.height==0) neww->core.width=100;

  // create the attribute list if needed
  neww->glwDrawingArea.myList=FALSE;
  if (neww->glwDrawingArea.attribList==NULL) {
    neww->glwDrawingArea.myList=TRUE;
    createAttribList(neww);
    }

  // Gotta have it
  assert(neww->glwDrawingArea.attribList);

  // determine the visual info if needed
  neww->glwDrawingArea.myVisual=FALSE;
  if (neww->glwDrawingArea.visualInfo==NULL) {
    neww->glwDrawingArea.myVisual=TRUE;
    createVisualInfo(neww);
    }

  // Gotta have that too
  assert(neww->glwDrawingArea.visualInfo);

  neww->core.depth=neww->glwDrawingArea.visualInfo->depth;

  // Reobtain the colormap and colors in it using XtGetApplicationResources
  XtGetApplicationResources((Widget)neww, neww, initializeResources, XtNumber(initializeResources), args, *num_args);

  // obtain the color resources if appropriate
  if (req->glwDrawingArea.allocateBackground) {
    XtGetApplicationResources((Widget)neww, neww, backgroundResources, XtNumber(backgroundResources), args, *num_args);
    }

#ifdef __GLX_MOTIF
  if (req->glwDrawingArea.allocateOtherColors) {
    XtGetApplicationResources((Widget)neww, neww, otherColorResources, XtNumber(otherColorResources), args, *num_args);
    }
#endif
  }



static void Realize(Widget w, Mask *valueMask, XSetWindowAttributes *attributes) {
  GLwDrawingAreaWidget glw=(GLwDrawingAreaWidget)w;
  GLwDrawingAreaCallbackStruct cb;
  Widget parentShell;
  Status status;
  Window windows[2], *windowsReturn, *windowList;
  int countReturn, i;

  /* if we haven't requested that the background be both installed and
   * allocated, don't install it.
   */
  if (!(glw->glwDrawingArea.installBackground && glw->glwDrawingArea.allocateBackground)) {
    *valueMask&=~CWBackPixel;
    }

  XtCreateWindow(w, (unsigned int)InputOutput, glw->glwDrawingArea.visualInfo->visual, *valueMask, attributes);

  // if appropriate, call XSetWMColormapWindows to install the colormap
  if (glw->glwDrawingArea.installColormap) {

    // Get parent shell
    for (parentShell=XtParent(w); parentShell&&!XtIsShell(parentShell); parentShell=XtParent(parentShell)) ;

    if (parentShell && XtWindow(parentShell)) {

      // check to see if there is already a property
      status=XGetWMColormapWindows(XtDisplay(parentShell), XtWindow(parentShell), &windowsReturn, &countReturn);

      // if no property, just create one
      if (!status) {
        windows[0]=XtWindow(w);
        windows[1]=XtWindow(parentShell);
        XSetWMColormapWindows(XtDisplay(parentShell), XtWindow(parentShell), windows, 2);
        }

      // there was a property, add myself to the beginning
      else {
        windowList=(Window *)XtMalloc((sizeof(Window))*(countReturn+1));
        windowList[0]=XtWindow(w);
        for (i=0; i<countReturn; i++) windowList[i+1]=windowsReturn[i];
        XSetWMColormapWindows(XtDisplay(parentShell), XtWindow(parentShell), windowList, countReturn+1);
        XtFree((char*)windowList);
        XtFree((char*)windowsReturn);
        }
      }
    else {
      warning(w, "Could not set colormap property on parent shell");
      }
    }

  // Invoke callbacks
  cb.reason=GLwCR_GINIT;
  cb.event=NULL;
  cb.width=glw->core.width;
  cb.height=glw->core.height;
  XtCallCallbackList((Widget)glw, glw->glwDrawingArea.ginitCallback, &cb);
  }



static void Redraw(GLwDrawingAreaWidget w, XEvent *event, Region region) {
    GLwDrawingAreaCallbackStruct cb;
    USE(region);
    if (!XtIsRealized((Widget)w)) return;
    cb.reason = GLwCR_EXPOSE;
    cb.event  = event;
    cb.width  = w->core.width;
    cb.height = w->core.height;
    XtCallCallbackList((Widget)w, w->glwDrawingArea.exposeCallback, &cb);
  }



static void Resize(GLwDrawingAreaWidget glw) {
  GLwDrawingAreaCallbackStruct cb;
  if (!XtIsRealized((Widget)glw)) return;
  cb.reason=GLwCR_RESIZE;
  cb.event=NULL;
  cb.width=glw->core.width;
  cb.height=glw->core.height;
  XtCallCallbackList((Widget)glw, glw->glwDrawingArea.resizeCallback, &cb);
  }



static void Destroy(GLwDrawingAreaWidget glw) {
  Window *windowsReturn;
  Widget parentShell;
  Status status;
  int countReturn;
  int i;

  if (glw->glwDrawingArea.myList && glw->glwDrawingArea.attribList) {
    XtFree((XtPointer)glw->glwDrawingArea.attribList);
    }

  if (glw->glwDrawingArea.myVisual && glw->glwDrawingArea.visualInfo) {
    XtFree((XtPointer)glw->glwDrawingArea.visualInfo);
    }

  // if my colormap was installed, remove it
  if (glw->glwDrawingArea.installColormap) {

    // Get parent shell
    for (parentShell=XtParent(glw); parentShell&&!XtIsShell(parentShell); parentShell=XtParent(parentShell)) ;

    if (parentShell && XtWindow(parentShell)) {

      // make sure there is a property
      status=XGetWMColormapWindows(XtDisplay(parentShell), XtWindow(parentShell), &windowsReturn, &countReturn);

      // if no property, just return.  If there was a property, continue
      if (status) {

        // search for a match
        for (i=0; i<countReturn; i++) {
          if (windowsReturn[i]==XtWindow(glw)) {

            // we found a match, now copy the rest down
            for (i++; i<countReturn; i++) { windowsReturn[i-1]=windowsReturn[i]; }

            XSetWMColormapWindows(XtDisplay(parentShell), XtWindow(parentShell), windowsReturn, countReturn-1);
            break;
            }
          }
        XtFree((char *)windowsReturn);
        }
      }
    }
  }



// Action routine for keyboard and mouse events
static void glwInput(GLwDrawingAreaWidget glw, XEvent *event, String *params, Cardinal *numParams) {
    GLwDrawingAreaCallbackStruct cb;
    USE(params);
    USE(numParams);
    cb.reason = GLwCR_INPUT;
    cb.event  = event;
    cb.width  = glw->core.width;
    cb.height = glw->core.height;
    XtCallCallbackList((Widget)glw, glw->glwDrawingArea.inputCallback, &cb);
}

void GLwDrawingAreaMakeCurrent(Widget w, GLXContext ctx) {
    // Make context current
    // ARB note: define it independent from __GLX_MOTIF (undefined on suse12.1)
    glXMakeCurrent(XtDisplay(w), XtWindow(w), ctx);
}

#ifdef __GLX_MOTIF

Widget GLwCreateMDrawingArea(Widget parent, char *name, ArgList arglist, Cardinal argcount) {
    // Create routine
    return XtCreateWidget(name, glwMDrawingAreaWidgetClass, parent, arglist, argcount);
}

#else

void GLwDrawingAreaSwapBuffers(Widget w) {
    // Swap buffers convenience function
    glXSwapBuffers(XtDisplay(w), XtWindow(w));
}

#endif