path: root/src/glw/GLwDrawA.c

/*
 * (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 * Unpublished-- rights reserved under the copyright laws of the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
 *
 */
#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[] = {
  {"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 */

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

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

  /* miscellaneous resources */
  {GLwNinstallColormap, GLwCInstallColormap, XtRBoolean, sizeof (Boolean),
       offset(installColormap), XtRImmediate, (XtPointer) TRUE},

  {GLwNallocateBackground, GLwCAllocateColors, XtRBoolean, sizeof (Boolean),
       offset(allocateBackground), XtRImmediate, (XtPointer) FALSE},

  {GLwNallocateOtherColors, GLwCAllocateColors, XtRBoolean, sizeof (Boolean),
       offset(allocateOtherColors), XtRImmediate, (XtPointer) FALSE},

  {GLwNinstallBackground, GLwCInstallBackground, XtRBoolean, sizeof (Boolean),
       offset(installBackground), XtRImmediate, (XtPointer) TRUE},

  {GLwNginitCallback, GLwCCallback, XtRCallback, sizeof (XtCallbackList),
       offset(ginitCallback), XtRImmediate, (XtPointer) NULL},

  {GLwNinputCallback, GLwCCallback, XtRCallback, sizeof (XtCallbackList),
       offset(inputCallback), XtRImmediate, (XtPointer) NULL},

  {GLwNresizeCallback, GLwCCallback, XtRCallback, sizeof (XtCallbackList),
       offset(resizeCallback), XtRImmediate, (XtPointer) NULL},

  {GLwNexposeCallback, GLwCCallback, XtRCallback, sizeof (XtCallbackList),
       offset(exposeCallback), XtRImmediate, (XtPointer) NULL},

  /* Changes to Motif primitive resources */
#ifdef __GLX_MOTIF
  {XmNtraversalOn, 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.
   */
  {XmNhighlightOnEnter, XmCHighlightOnEnter, XmRBoolean, sizeof (Boolean),
   XtOffset (GLwDrawingAreaWidget, primitive.highlight_on_enter),
   XmRImmediate, (XtPointer) FALSE},
  
  {XmNhighlightThickness, 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"},
   /*XmRCallProc,(XtPointer)_XmBackgroundColorDefault},*/

  {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"},
   /*XtRString,(XtPointer)"XtDefaultBackground"},*/

  {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"},
   /*XmRCallProc, (XtPointer) _XmForegroundColorDefault},*/

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

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


#undef offset


GLwDrawingAreaClassRec glwDrawingAreaClassRec = {
  { /* core fields */
#ifdef __GLX_MOTIF
    /* superclass                */        (WidgetClass) &xmPrimitiveClassRec,
    /* class_name                */        "GLwMDrawingArea",
#else /* not __GLX_MOTIF */
    /* superclass                */        (WidgetClass) &widgetClassRec,
    /* class_name                */        "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 */
  {
    /* border_highlight          */        XmInheritBorderHighlight,
    /* border_unhighlight        */        XmInheritBorderUnhighlight,
    /* translations              */        XtInheritTranslations,
    /* arm_and_activate          */        NULL,
    /* get_resources             */        NULL,
    /* num get_resources         */        0,
    /* extension                 */        NULL,                                
  }
#endif 
  };

WidgetClass glwDrawingAreaWidgetClass=(WidgetClass)&glwDrawingAreaClassRec;



static void error(Widget w,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,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){
  static XVisualInfo *visualInfo;
  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;
  register int i;
    
  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){
  register 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;
  XtCallbackList cblist;
  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;
  register 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;
  cb.reason=GLwCR_INPUT;
  cb.event=event;
  cb.width=glw->core.width;
  cb.height=glw->core.height;
  XtCallCallbackList((Widget)glw,glw->glwDrawingArea.inputCallback,&cb);
  }


#ifdef __GLX_MOTIF

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

#endif


#ifndef __GLX_MOTIF

/* Make context current */
void GLwDrawingAreaMakeCurrent(Widget w,GLXContext ctx){
  glXMakeCurrent(XtDisplay(w),XtWindow(w),ctx);
  }


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

#endif