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source: trunk/geant4/visualization/OpenGL/src/G4OpenGLSceneHandler.cc @ 746

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1	//
2	// ********************************************************************
3	// * License and Disclaimer *
4	// * *
5	// * The Geant4 software is copyright of the Copyright Holders of *
6	// * the Geant4 Collaboration. It is provided under the terms and *
7	// * conditions of the Geant4 Software License, included in the file *
8	// * LICENSE and available at http://cern.ch/geant4/license . These *
9	// * include a list of copyright holders. *
10	// * *
11	// * Neither the authors of this software system, nor their employing *
12	// * institutes,nor the agencies providing financial support for this *
13	// * work make any representation or warranty, express or implied, *
14	// * regarding this software system or assume any liability for its *
15	// * use. Please see the license in the file LICENSE and URL above *
16	// * for the full disclaimer and the limitation of liability. *
17	// * *
18	// * This code implementation is the result of the scientific and *
19	// * technical work of the GEANT4 collaboration. *
20	// * By using, copying, modifying or distributing the software (or *
21	// * any work based on the software) you agree to acknowledge its *
22	// * use in resulting scientific publications, and indicate your *
23	// * acceptance of all terms of the Geant4 Software license. *
24	// ********************************************************************
25	//
26	//
27	// $Id: G4OpenGLSceneHandler.cc,v 1.52 2008/01/04 22:07:01 allison Exp $
28	// GEANT4 tag $Name: $
29	//
30	//
31	// Andrew Walkden 27th March 1996
32	// OpenGL stored scene - creates OpenGL display lists.
33	// OpenGL immediate scene - draws immediately to buffer
34	// (saving space on server).
35
36	#ifdef G4VIS_BUILD_OPENGL_DRIVER
37
38	// Included here - problems with HP compiler if not before other includes?
39	#include "G4NURBS.hh"
40
41	// Here follows a special for Mesa, the OpenGL emulator. Does not affect
42	// other OpenGL's, as far as I'm aware. John Allison 18/9/96.
43	#define CENTERLINE_CLPP /* CenterLine C++ workaround: */
44	// Also seems to be required for HP's CC and AIX xlC, at least.
45
46	#include "G4OpenGLSceneHandler.hh"
47	#include "G4OpenGLViewer.hh"
48	#include "G4OpenGLFontBaseStore.hh"
49	#include "G4OpenGLTransform3D.hh"
50	#include "G4Point3D.hh"
51	#include "G4Normal3D.hh"
52	#include "G4Transform3D.hh"
53	#include "G4Polyline.hh"
54	#include "G4Polymarker.hh"
55	#include "G4Text.hh"
56	#include "G4Circle.hh"
57	#include "G4Square.hh"
58	#include "G4VMarker.hh"
59	#include "G4Polyhedron.hh"
60	#include "G4VisAttributes.hh"
61	#include "G4PhysicalVolumeModel.hh"
62	#include "G4VPhysicalVolume.hh"
63	#include "G4LogicalVolume.hh"
64	#include "G4VSolid.hh"
65	#include "G4Scene.hh"
66	#include "G4VisExtent.hh"
67	#include "G4AttHolder.hh"
68
69	G4OpenGLSceneHandler::G4OpenGLSceneHandler (G4VGraphicsSystem& system,
70	G4int id,
71	const G4String& name):
72	G4VSceneHandler (system, id, name),
73	fPickName(0),
74	fProcessing2D (false),
75	fProcessingPolymarker(false)
76	{}
77
78	G4OpenGLSceneHandler::~G4OpenGLSceneHandler ()
79	{
80	ClearStore ();
81	}
82
83	const GLubyte G4OpenGLSceneHandler::fStippleMaskHashed [128] = {
84	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
85	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
86	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
87	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
88	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
89	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
90	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
91	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
92	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
93	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
94	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
95	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
96	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
97	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
98	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
99	0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55
100	};
101
102	void G4OpenGLSceneHandler::ClearAndDestroyAtts()
103	{
104	std::map<GLuint, G4AttHolder*>::iterator i;
105	for (i = fPickMap.begin(); i != fPickMap.end(); ++i) delete i->second;
106	fPickMap.clear();
107	}
108
109	void G4OpenGLSceneHandler::PreAddSolid
110	(const G4Transform3D& objectTransformation,
111	const G4VisAttributes& visAttribs)
112	{
113	G4VSceneHandler::PreAddSolid (objectTransformation, visAttribs);
114	}
115
116	void G4OpenGLSceneHandler::BeginPrimitives
117	(const G4Transform3D& objectTransformation)
118	{
119	G4VSceneHandler::BeginPrimitives (objectTransformation);
120	}
121
122	void G4OpenGLSceneHandler::EndPrimitives ()
123	{
124	G4VSceneHandler::EndPrimitives ();
125	}
126
127	void G4OpenGLSceneHandler::BeginPrimitives2D
128	(const G4Transform3D& objectTransformation)
129	{
130	G4VSceneHandler::BeginPrimitives2D (objectTransformation);
131	fProcessing2D = true;
132	}
133
134	void G4OpenGLSceneHandler::EndPrimitives2D ()
135	{
136	fProcessing2D = false;
137	G4VSceneHandler::EndPrimitives2D ();
138	}
139
140	const G4Polyhedron* G4OpenGLSceneHandler::CreateSectionPolyhedron ()
141	{
142	// Clipping done in G4OpenGLViewer::SetView.
143	return 0;
144
145	// But...OpenGL no longer seems to reconstruct clipped edges, so,
146	// when the BooleanProcessor is up to it, abandon this and use
147	// generic clipping in G4VSceneHandler::CreateSectionPolyhedron...
148	// return G4VSceneHandler::CreateSectionPolyhedron();
149	}
150
151	const G4Polyhedron* G4OpenGLSceneHandler::CreateCutawayPolyhedron ()
152	{
153	// Cutaway done in G4OpenGLViewer::SetView.
154	return 0;
155
156	// But...if not, when the BooleanProcessor is up to it...
157	// return G4VSceneHandler::CreateCutawayPolyhedron();
158	}
159
160	void G4OpenGLSceneHandler::AddPrimitive (const G4Polyline& line)
161	{
162	G4int nPoints = line.size ();
163	if (nPoints <= 0) return;
164
165	// Loads G4Atts for picking...
166	if (fpViewer->GetViewParameters().IsPicking()) {
167	G4AttHolder* holder = new G4AttHolder;
168	LoadAtts(line, holder);
169	fPickMap[fPickName] = holder;
170	}
171
172	// Note: colour treated in sub-class.
173
174	if (fpViewer -> GetViewParameters ().IsMarkerNotHidden ())
175	glDisable (GL_DEPTH_TEST);
176	else {glEnable (GL_DEPTH_TEST); glDepthFunc (GL_LESS);}
177
178	glDisable (GL_LIGHTING);
179
180	// Get vis attributes - pick up defaults if none.
181	const G4VisAttributes* pVA =
182	fpViewer -> GetApplicableVisAttributes (line.GetVisAttributes ());
183
184	G4double lineWidth = GetLineWidth(pVA);
185	glLineWidth(lineWidth);
186
187	glBegin (GL_LINE_STRIP);
188	for (G4int iPoint = 0; iPoint < nPoints; iPoint++) {
189	G4double x, y, z;
190	x = line[iPoint].x();
191	y = line[iPoint].y();
192	z = line[iPoint].z();
193	glVertex3d (x, y, z);
194	}
195	glEnd ();
196	}
197
198	void G4OpenGLSceneHandler::AddPrimitive (const G4Polymarker& polymarker)
199	{
200	G4int nPoints = polymarker.size ();
201	if (nPoints <= 0) return;
202
203	fProcessingPolymarker = true;
204
205	// Loads G4Atts for picking...
206	if (fpViewer->GetViewParameters().IsPicking()) {
207	G4AttHolder* holder = new G4AttHolder;
208	LoadAtts(polymarker, holder);
209	fPickMap[fPickName] = holder;
210	}
211
212	switch (polymarker.GetMarkerType()) {
213	default:
214	case G4Polymarker::dots:
215	{
216	for (size_t iPoint = 0; iPoint < polymarker.size (); iPoint++) {
217	G4Circle dot (polymarker);
218	dot.SetPosition (polymarker[iPoint]);
219	dot.SetWorldSize (0.);
220	dot.SetScreenSize (0.1); // Very small circle.
221	G4OpenGLSceneHandler::AddPrimitive (dot);
222	}
223	}
224	break;
225	case G4Polymarker::circles:
226	{
227	for (size_t iPoint = 0; iPoint < polymarker.size (); iPoint++) {
228	G4Circle circle (polymarker);
229	circle.SetPosition (polymarker[iPoint]);
230	G4OpenGLSceneHandler::AddPrimitive (circle);
231	}
232	}
233	break;
234	case G4Polymarker::squares:
235	{
236	for (size_t iPoint = 0; iPoint < polymarker.size (); iPoint++) {
237	G4Square square (polymarker);
238	square.SetPosition (polymarker[iPoint]);
239	G4OpenGLSceneHandler::AddPrimitive (square);
240	}
241	}
242	break;
243	}
244
245	fProcessingPolymarker = false;
246	}
247
248	void G4OpenGLSceneHandler::AddPrimitive (const G4Text& text) {
249
250	// Loads G4Atts for picking...
251	if (fpViewer->GetViewParameters().IsPicking()) {
252	G4AttHolder* holder = new G4AttHolder;
253	LoadAtts(text, holder);
254	fPickMap[fPickName] = holder;
255	}
256
257	const G4Colour& c = GetTextColour (text); // Picks up default if none.
258	MarkerSizeType sizeType;
259	G4double size = GetMarkerSize (text, sizeType);
260	G4ThreeVector position (text.GetPosition ());
261	G4String textString = text.GetText();
262
263	G4int font_base = G4OpenGLFontBaseStore::GetFontBase(fpViewer,size);
264	if (font_base < 0) {
265	static G4int callCount = 0;
266	++callCount;
267	if (callCount <= 10 \|\| callCount%100 == 0) {
268	G4cout <<
269	"G4OpenGLSceneHandler::AddPrimitive (const G4Text&) call count "
270	<< callCount <<
271	"\n No fonts available."
272	"\n Called with text \""
273	<< text.GetText ()
274	<< "\"\n at " << position
275	<< ", size " << size
276	<< ", offsets " << text.GetXOffset () << ", " << text.GetYOffset ()
277	<< ", type " << G4int(sizeType)
278	<< ", colour " << c
279	<< G4endl;
280	}
281	return;
282	}
283	const char* textCString = textString.c_str();
284	glColor3d (c.GetRed (), c.GetGreen (), c.GetBlue ());
285	glDisable (GL_DEPTH_TEST);
286	glDisable (GL_LIGHTING);
287
288	glRasterPos3d(position.x(),position.y(),position.z());
289	// No action on offset or layout at present.
290	glPushAttrib(GL_LIST_BIT);
291	glListBase(font_base);
292	glCallLists(strlen(textCString), GL_UNSIGNED_BYTE, (GLubyte *)textCString);
293	glPopAttrib();
294	}
295
296	void G4OpenGLSceneHandler::AddPrimitive (const G4Circle& circle) {
297	glEnable (GL_POINT_SMOOTH);
298	AddCircleSquare (circle, G4OpenGLBitMapStore::circle);
299	}
300
301	void G4OpenGLSceneHandler::AddPrimitive (const G4Square& square) {
302	glDisable (GL_POINT_SMOOTH);
303	AddCircleSquare (square, G4OpenGLBitMapStore::square);
304	}
305
306	void G4OpenGLSceneHandler::AddCircleSquare
307	(const G4VMarker& marker,
308	G4OpenGLBitMapStore::Shape shape) {
309
310	if (!fProcessingPolymarker) { // Polymarker has already loaded atts.
311	// Loads G4Atts for picking...
312	if (fpViewer->GetViewParameters().IsPicking()) {
313	G4AttHolder* holder = new G4AttHolder;
314	LoadAtts(marker, holder);
315	fPickMap[fPickName] = holder;
316	}
317	}
318
319	// Note: colour treated in sub-class.
320
321	if (fpViewer -> GetViewParameters ().IsMarkerNotHidden ())
322	glDisable (GL_DEPTH_TEST);
323	else {glEnable (GL_DEPTH_TEST); glDepthFunc (GL_LESS);}
324
325	glDisable (GL_LIGHTING);
326
327	// Get vis attributes - pick up defaults if none.
328	const G4VisAttributes* pVA =
329	fpViewer -> GetApplicableVisAttributes (marker.GetVisAttributes ());
330
331	G4double lineWidth = GetLineWidth(pVA);
332	glLineWidth(lineWidth);
333
334	G4VMarker::FillStyle style = marker.GetFillStyle();
335
336	G4bool filled = false;
337	static G4bool hashedWarned = false;
338
339	switch (style) {
340	case G4VMarker::noFill:
341	glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
342	filled = false;
343	break;
344
345	case G4VMarker::hashed:
346	if (!hashedWarned) {
347	G4cout << "Hashed fill style in G4OpenGLSceneHandler."
348	<< "\n Not implemented. Using G4VMarker::filled."
349	<< G4endl;
350	hashedWarned = true;
351	}
352	// Maybe use
353	//glPolygonStipple (fStippleMaskHashed);
354	// Drop through to filled...
355
356	case G4VMarker::filled:
357	glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
358	filled = true;
359	break;
360
361	}
362
363	// A few useful quantities...
364	G4Point3D centre = marker.GetPosition();
365	MarkerSizeType sizeType;
366	G4double size = GetMarkerSize(marker, sizeType);
367
368	// Draw...
369	if (sizeType == world) { // Size specified in world coordinates.
370
371	DrawXYPolygon (shape, size, centre, pVA);
372
373	} else { // Size specified in screen (window) coordinates.
374
375	glRasterPos3d(centre.x(),centre.y(),centre.z());
376	const GLubyte* marker =
377	G4OpenGLBitMapStore::GetBitMap(shape, size, filled);
378	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
379	glBitmap(GLsizei(size), GLsizei(size), size/2., size/2., 0., 0., marker);
380	}
381	}
382
383	void G4OpenGLSceneHandler::DrawXYPolygon
384	(G4OpenGLBitMapStore::Shape shape,
385	G4double size,
386	const G4Point3D& centre,
387	const G4VisAttributes* pApplicableVisAtts)
388	{
389	G4int nSides;
390	G4double startPhi;
391	if (shape == G4OpenGLBitMapStore::circle) {
392	nSides = GetNoOfSides(pApplicableVisAtts);
393	startPhi = 0.;
394	} else {
395	nSides = 4;
396	startPhi = -pi / 4.;
397	}
398
399	const G4Vector3D& viewpointDirection =
400	fpViewer -> GetViewParameters().GetViewpointDirection();
401	const G4Vector3D& up = fpViewer->GetViewParameters().GetUpVector();
402	const G4double dPhi = twopi / nSides;
403	const G4double radius = size / 2.;
404	G4Vector3D start = radius * (up.cross(viewpointDirection)).unit();
405	G4double phi;
406	G4int i;
407
408	glBegin (GL_POLYGON);
409	for (i = 0, phi = startPhi; i < nSides; i++, phi += dPhi) {
410	G4Vector3D r = start; r.rotate(phi, viewpointDirection);
411	G4Vector3D p = centre + r;
412	glVertex3d (p.x(), p.y(), p.z());
413	}
414	glEnd ();
415	}
416
417	void G4OpenGLSceneHandler::AddPrimitive (const G4Scale& scale)
418	{
419	G4VSceneHandler::AddPrimitive(scale);
420	}
421
422	//Method for handling G4Polyhedron objects for drawing solids.
423	void G4OpenGLSceneHandler::AddPrimitive (const G4Polyhedron& polyhedron) {
424
425	// Assume all facets are planar convex quadrilaterals.
426	// Draw each facet individually
427
428	if (polyhedron.GetNoFacets() == 0) return;
429
430	// Loads G4Atts for picking...
431	if (fpViewer->GetViewParameters().IsPicking()) {
432	G4AttHolder* holder = new G4AttHolder;
433	LoadAtts(polyhedron, holder);
434	fPickMap[fPickName] = holder;
435	}
436
437	// Get vis attributes - pick up defaults if none.
438	const G4VisAttributes* pVA =
439	fpViewer -> GetApplicableVisAttributes (polyhedron.GetVisAttributes ());
440
441	// Get view parameters that the user can force through the vis
442	// attributes, thereby over-riding the current view parameter.
443	G4ViewParameters::DrawingStyle drawing_style = GetDrawingStyle (pVA);
444
445	//Get colour, etc...
446	G4bool transparency_enabled = true;
447	G4OpenGLViewer* pViewer = dynamic_cast<G4OpenGLViewer*>(fpViewer);
448	if (pViewer) transparency_enabled = pViewer->transparency_enabled;
449	const G4Colour& c = pVA->GetColour();
450	GLfloat materialColour [4];
451	materialColour [0] = c.GetRed ();
452	materialColour [1] = c.GetGreen ();
453	materialColour [2] = c.GetBlue ();
454	if (transparency_enabled) {
455	materialColour [3] = c.GetAlpha ();
456	} else {
457	materialColour [3] = 1.;
458	}
459
460	G4double lineWidth = GetLineWidth(pVA);
461	glLineWidth(lineWidth);
462
463	GLfloat clear_colour[4];
464	glGetFloatv (GL_COLOR_CLEAR_VALUE, clear_colour);
465
466	G4bool isAuxEdgeVisible = GetAuxEdgeVisible (pVA);
467
468	G4bool clipping = pViewer->fVP.IsSection() \|\| pViewer->fVP.IsCutaway();
469
470	switch (drawing_style) {
471	case (G4ViewParameters::hlhsr):
472	// Set up as for hidden line removal but paint polygon faces later...
473	case (G4ViewParameters::hlr):
474	glEnable (GL_STENCIL_TEST);
475	// The stencil buffer is cleared in G4OpenGLViewer::ClearView.
476	// The procedure below leaves it clear.
477	glStencilFunc (GL_ALWAYS, 0, 1);
478	glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT);
479	glEnable (GL_DEPTH_TEST);
480	glDepthFunc (GL_LEQUAL);
481	if (materialColour[3] < 1.) {
482	// Transparent...
483	glDisable (GL_CULL_FACE);
484	glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
485	} else {
486	// Opaque...
487	if (clipping) {
488	glDisable (GL_CULL_FACE);
489	glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
490	} else {
491	glEnable (GL_CULL_FACE);
492	glCullFace (GL_BACK);
493	glPolygonMode (GL_FRONT, GL_LINE);
494	}
495	}
496	glDisable (GL_LIGHTING);
497	glColor3d (c.GetRed (), c.GetGreen (), c.GetBlue ());
498	break;
499	case (G4ViewParameters::hsr):
500	glEnable (GL_DEPTH_TEST);
501	glDepthFunc (GL_LEQUAL);
502	if (materialColour[3] < 1.) {
503	// Transparent...
504	glDepthMask (0); // Make depth buffer read-only.
505	glDisable (GL_CULL_FACE);
506	glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
507	glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, materialColour);
508	} else {
509	// Opaque...
510	glDepthMask (1); // Make depth buffer writable (default).
511	if (clipping) {
512	glDisable (GL_CULL_FACE);
513	glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
514	} else {
515	glEnable (GL_CULL_FACE);
516	glCullFace (GL_BACK);
517	glPolygonMode (GL_FRONT, GL_FILL);
518	}
519	glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, materialColour);
520	}
521	if (!fProcessing2D) glEnable (GL_LIGHTING);
522	break;
523	case (G4ViewParameters::wireframe):
524	default:
525	glEnable (GL_DEPTH_TEST);
526	glDepthFunc (GL_LEQUAL); //??? was GL_ALWAYS
527	glDisable (GL_CULL_FACE);
528	glDisable (GL_LIGHTING);
529	glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
530	glColor3d (c.GetRed (), c.GetGreen (), c.GetBlue ());
531	break;
532	}
533
534	//Loop through all the facets...
535	glBegin (GL_QUADS);
536	G4bool notLastFace;
537	do {
538
539	//First, find vertices, edgeflags and normals and note "not last facet"...
540	G4Point3D vertex[4];
541	G4int edgeFlag[4];
542	G4Normal3D normals[4];
543	G4int n;
544	notLastFace = polyhedron.GetNextFacet(n, vertex, edgeFlag, normals);
545
546	//Loop through the four edges of each G4Facet...
547	G4int edgeCount = 0;
548	for(edgeCount = 0; edgeCount < n; ++edgeCount) {
549	// Check to see if edge is visible or not...
550	if (isAuxEdgeVisible) {
551	edgeFlag[edgeCount] = 1;
552	}
553	if (edgeFlag[edgeCount] > 0) {
554	glEdgeFlag (GL_TRUE);
555	} else {
556	glEdgeFlag (GL_FALSE);
557	}
558	glNormal3d (normals[edgeCount].x(),
559	normals[edgeCount].y(),
560	normals[edgeCount].z());
561	glVertex3d (vertex[edgeCount].x(),
562	vertex[edgeCount].y(),
563	vertex[edgeCount].z());
564	}
565	// HepPolyhedron produces triangles too; in that case add an extra
566	// vertex identical to first...
567	if (n == 3) {
568	edgeCount = 3;
569	normals[edgeCount] = normals[0];
570	vertex[edgeCount] = vertex[0];
571	edgeFlag[edgeCount] = -1;
572	glEdgeFlag (GL_FALSE);
573	glNormal3d (normals[edgeCount].x(),
574	normals[edgeCount].y(),
575	normals[edgeCount].z());
576	glVertex3d (vertex[edgeCount].x(),
577	vertex[edgeCount].y(),
578	vertex[edgeCount].z());
579	}
580	// Trap situation where number of edges is > 4...
581	if (n > 4) {
582	G4cerr <<
583	"G4OpenGLSceneHandler::AddPrimitive(G4Polyhedron): WARNING";
584	G4PhysicalVolumeModel* pPVModel =
585	dynamic_cast<G4PhysicalVolumeModel*>(fpModel);
586	if (pPVModel) {
587	G4VPhysicalVolume* pCurrentPV = pPVModel->GetCurrentPV();
588	G4LogicalVolume* pCurrentLV = pPVModel->GetCurrentLV();
589	G4cerr <<
590	"\n Volume " << pCurrentPV->GetName() <<
591	", Solid " << pCurrentLV->GetSolid()->GetName() <<
592	" (" << pCurrentLV->GetSolid()->GetEntityType();
593	}
594	G4cerr<<
595	"\n G4Polyhedron facet with " << n << " edges" << G4endl;
596	}
597
598	// Do it all over again (twice) for hlr...
599	if (drawing_style == G4ViewParameters::hlr \|\|
600	drawing_style == G4ViewParameters::hlhsr) {
601
602	glEnd (); // Placed here to balance glBegin above, allowing GL
603	// state changes below, then glBegin again. Avoids
604	// having glBegin/End pairs inside loop in the more
605	// usual case of no hidden line removal.
606
607	// Draw through stencil...
608	glStencilFunc (GL_EQUAL, 0, 1);
609	glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
610	if (drawing_style == G4ViewParameters::hlhsr) {
611	if (!fProcessing2D) glEnable (GL_LIGHTING);
612	}
613	glEnable (GL_DEPTH_TEST);
614	glDepthFunc (GL_LEQUAL);
615	if (materialColour[3] < 1.) {
616	// Transparent...
617	glDepthMask (0); // Make depth buffer read-only.
618	glDisable (GL_CULL_FACE);
619	glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
620	} else {
621	// Opaque...
622	glDepthMask (1); // Make depth buffer writable (default).
623	if (clipping) {
624	glDisable (GL_CULL_FACE);
625	glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
626	} else {
627	glEnable (GL_CULL_FACE);
628	glCullFace (GL_BACK);
629	glPolygonMode (GL_FRONT, GL_FILL);
630	}
631	}
632	GLfloat* painting_colour;
633	if (drawing_style == G4ViewParameters::hlr) {
634	if (materialColour[3] < 1.) {
635	// Transparent - don't paint...
636	goto end_of_drawing_through_stencil;
637	}
638	painting_colour = clear_colour;
639	} else { // drawing_style == G4ViewParameters::hlhsr
640	painting_colour = materialColour;
641	}
642	if (materialColour[3] < 1.) {
643	// Transparent...
644	glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, painting_colour);
645	} else {
646	// Opaque...
647	glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, painting_colour);
648	}
649	glColor4fv (painting_colour);
650	glBegin (GL_QUADS);
651	for (int edgeCount = 0; edgeCount < 4; ++edgeCount) {
652	if (edgeFlag[edgeCount] > 0) {
653	glEdgeFlag (GL_TRUE);
654	} else {
655	glEdgeFlag (GL_FALSE);
656	}
657	glNormal3d (normals[edgeCount].x(),
658	normals[edgeCount].y(),
659	normals[edgeCount].z());
660	glVertex3d (vertex[edgeCount].x(),
661	vertex[edgeCount].y(),
662	vertex[edgeCount].z());
663	}
664	glEnd ();
665	end_of_drawing_through_stencil:
666
667	// and once more to reset the stencil bits...
668	glStencilFunc (GL_ALWAYS, 0, 1);
669	glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT);
670	glDepthFunc (GL_LEQUAL); // to make sure line gets drawn.
671	if (materialColour[3] < 1.) {
672	// Transparent...
673	glDisable (GL_CULL_FACE);
674	glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
675	} else {
676	// Opaque...
677	if (clipping) {
678	glDisable (GL_CULL_FACE);
679	glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
680	} else {
681	glEnable (GL_CULL_FACE);
682	glCullFace (GL_BACK);
683	glPolygonMode (GL_FRONT, GL_LINE);
684	}
685	}
686	glDisable (GL_LIGHTING);
687	glColor3d (c.GetRed (), c.GetGreen (), c.GetBlue ());
688	glBegin (GL_QUADS);
689	for (int edgeCount = 0; edgeCount < 4; ++edgeCount) {
690	if (edgeFlag[edgeCount] > 0) {
691	glEdgeFlag (GL_TRUE);
692	} else {
693	glEdgeFlag (GL_FALSE);
694	}
695	glNormal3d (normals[edgeCount].x(),
696	normals[edgeCount].y(),
697	normals[edgeCount].z());
698	glVertex3d (vertex[edgeCount].x(),
699	vertex[edgeCount].y(),
700	vertex[edgeCount].z());
701	}
702	glEnd ();
703	glDepthFunc (GL_LEQUAL); // Revert for next facet.
704	glBegin (GL_QUADS); // Ready for next facet. GL
705	// says it ignores incomplete
706	// quadrilaterals, so final empty
707	// glBegin/End sequence should be OK.
708	}
709	} while (notLastFace);
710
711	glEnd ();
712	glDisable (GL_STENCIL_TEST); // Revert to default for next primitive.
713	glDepthMask (1); // Revert to default for next primitive.
714	}
715
716	//Method for handling G4NURBS objects for drawing solids.
717	//Knots and Ctrl Pnts MUST be arrays of GLfloats.
718	void G4OpenGLSceneHandler::AddPrimitive (const G4NURBS& nurb) {
719
720	// Loads G4Atts for picking...
721	if (fpViewer->GetViewParameters().IsPicking()) {
722	G4AttHolder* holder = new G4AttHolder;
723	LoadAtts(nurb, holder);
724	fPickMap[fPickName] = holder;
725	}
726
727	GLUnurbsObj *gl_nurb;
728	gl_nurb = gluNewNurbsRenderer ();
729
730	GLfloat u_knot_array, u_knot_array_ptr;
731	u_knot_array = u_knot_array_ptr = new GLfloat [nurb.GetnbrKnots(G4NURBS::U)];
732	G4NURBS::KnotsIterator u_iterator (nurb, G4NURBS::U);
733	while (u_iterator.pick (u_knot_array_ptr++));
734
735	GLfloat v_knot_array, v_knot_array_ptr;
736	v_knot_array = v_knot_array_ptr = new GLfloat [nurb.GetnbrKnots(G4NURBS::V)];
737	G4NURBS::KnotsIterator v_iterator (nurb, G4NURBS::V);
738	while (v_iterator.pick (v_knot_array_ptr++));
739
740	GLfloat ctrl_pnt_array, ctrl_pnt_array_ptr;
741	ctrl_pnt_array = ctrl_pnt_array_ptr =
742	new GLfloat [nurb.GettotalnbrCtrlPts () * G4NURBS::NofC];
743	G4NURBS::CtrlPtsCoordsIterator c_p_iterator (nurb);
744	while (c_p_iterator.pick (ctrl_pnt_array_ptr++));
745
746	// Get vis attributes - pick up defaults if none.
747	const G4VisAttributes* pVA =
748	fpViewer -> GetApplicableVisAttributes (nurb.GetVisAttributes ());
749
750	// Get view parameters that the user can force through the vis
751	// attributes, thereby over-riding the current view parameter.
752	G4ViewParameters::DrawingStyle drawing_style = GetDrawingStyle (pVA);
753	//G4bool isAuxEdgeVisible = GetAuxEdgeVisible (pVA);
754
755	//Get colour, etc..
756	const G4Colour& c = pVA -> GetColour ();
757
758	switch (drawing_style) {
759
760	case (G4ViewParameters::hlhsr):
761	// G4cout << "Hidden line removal not implememented in G4OpenGL.\n"
762	// << "Using hidden surface removal." << G4endl;
763	case (G4ViewParameters::hsr):
764	{
765	if (!fProcessing2D) glEnable (GL_LIGHTING);
766	glEnable (GL_DEPTH_TEST);
767	glEnable (GL_AUTO_NORMAL);
768	glEnable (GL_NORMALIZE);
769	gluNurbsProperty (gl_nurb, GLU_DISPLAY_MODE, GLU_FILL);
770	gluNurbsProperty (gl_nurb, GLU_SAMPLING_TOLERANCE, 50.0);
771	GLfloat materialColour [4];
772	materialColour [0] = c.GetRed ();
773	materialColour [1] = c.GetGreen ();
774	materialColour [2] = c.GetBlue ();
775	materialColour [3] = 1.0; // = c.GetAlpha () for transparency -
776	// but see complication in
777	// AddPrimitive(const G4Polyhedron&).
778	glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, materialColour);
779	break;
780	}
781	case (G4ViewParameters::hlr):
782	// G4cout << "Hidden line removal not implememented in G4OpenGL.\n"
783	// << "Using wireframe." << G4endl;
784	case (G4ViewParameters::wireframe):
785	default:
786	glDisable (GL_LIGHTING);
787	// glDisable (GL_DEPTH_TEST);
788	glEnable (GL_DEPTH_TEST);
789	glDisable (GL_AUTO_NORMAL);
790	glDisable (GL_NORMALIZE);
791	gluNurbsProperty (gl_nurb, GLU_DISPLAY_MODE, GLU_OUTLINE_POLYGON);
792	gluNurbsProperty (gl_nurb, GLU_SAMPLING_TOLERANCE, 50.0);
793	glColor3d (c.GetRed (), c.GetGreen (), c.GetBlue ());
794	break;
795	}
796
797	gluBeginSurface (gl_nurb);
798	G4int u_stride = 4;
799	G4int v_stride = nurb.GetnbrCtrlPts(G4NURBS::U) * 4;
800
801	gluNurbsSurface (gl_nurb,
802	nurb.GetnbrKnots (G4NURBS::U), (GLfloat*)u_knot_array,
803	nurb.GetnbrKnots (G4NURBS::V), (GLfloat*)v_knot_array,
804	u_stride,
805	v_stride,
806	ctrl_pnt_array,
807	nurb.GetUorder (),
808	nurb.GetVorder (),
809	GL_MAP2_VERTEX_4);
810
811	gluEndSurface (gl_nurb);
812
813	delete [] u_knot_array; // These should be allocated with smart allocators
814	delete [] v_knot_array; // to avoid memory explosion.
815	delete [] ctrl_pnt_array;
816
817	gluDeleteNurbsRenderer (gl_nurb);
818	}
819
820	void G4OpenGLSceneHandler::AddCompound(const G4VTrajectory& traj) {
821	G4VSceneHandler::AddCompound(traj); // For now.
822	}
823
824	void G4OpenGLSceneHandler::AddCompound(const G4VHit& hit) {
825	G4VSceneHandler::AddCompound(hit); // For now.
826	}
827
828	#endif

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