aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/extras/Mesa/src/glw/GLwDrawA.c
blob: 30304a40801d168e94538795b138e99fae91167a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
/*
 * (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){
  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;
  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