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source: GTP/trunk/Lib/Vis/Preprocessing/src/GlRenderer.cpp @ 1785

Revision 1785, 33.8 KB checked in by bittner, 18 years ago (diff)
merge, filter update, renderebuffer made functional
Property svn:executable set to ``*

Line
1	#include "Mesh.h"
2	#include "glInterface.h"
3	#include "OcclusionQuery.h"
4	#include "GlRenderer.h"
5	#include "ViewCellsManager.h"
6	#include "SceneGraph.h"
7	#include "Pvs.h"
8	#include "Viewcell.h"
9	#include "Beam.h"
10	#include "KdTree.h"
11	#include "Environment.h"
12	#include "Triangle3.h"
13	#include "IntersectableWrapper.h"
14	#include "BvHierarchy.h"
15	#include "KdTree.h"
16
17	//#include <Cg/cg.h>
18	//#include <Cg/cgGL.h>
19
20
21	namespace GtpVisibilityPreprocessor {
22
23
24	static bool arbQuerySupport = false;
25	static bool nvQuerySupport = false;
26
27	GLuint frontDepthMap;
28	GLuint backDepthMap;
29
30	const int depthMapSize = 512;
31
32	static void InitExtensions()
33	{
34	GLenum err = glewInit();
35
36	if (GLEW_OK != err)
37	{
38	// problem: glewInit failed, something is seriously wrong
39	cerr << "Error: " << glewGetErrorString(err) << endl;
40	exit(1);
41	}
42
43	if (GLEW_ARB_occlusion_query)
44	arbQuerySupport = true;
45
46	if (GLEW_NV_occlusion_query)
47	nvQuerySupport = true;
48
49
50	if (!arbQuerySupport && !nvQuerySupport)
51	{
52	cout << "I require the GL_ARB_occlusion_query or the GL_NV_occlusion_query OpenGL extension to work.\n";
53	exit(1);
54	}
55	}
56
57
58	GlRenderer::GlRenderer(SceneGraph *sceneGraph,
59	ViewCellsManager *viewCellsManager,
60	KdTree *tree):
61	Renderer(sceneGraph, viewCellsManager),
62	mKdTree(tree)
63	{
64	mSceneGraph->CollectObjects(&mObjects);
65
66	// mViewCellsManager->GetViewPoint(mViewPoint);
67
68	mViewPoint = mSceneGraph->GetBox().Center();
69	mViewDirection = Vector3(0,0,1);
70
71	// mViewPoint = Vector3(991.7, 187.8, -271);
72	// mViewDirection = Vector3(0.9, 0, -0.4);
73
74	// timerId = startTimer(10);
75	// debug coords for atlanta
76	// mViewPoint = Vector3(3473, 6.778, -1699);
77	// mViewDirection = Vector3(-0.2432, 0, 0.97);
78
79	mFrame = 0;
80	mWireFrame = false;
81	Environment::GetSingleton()->GetBoolValue("Preprocessor.detectEmptyViewSpace", mDetectEmptyViewSpace);
82	mSnapErrorFrames = true;
83	mSnapPrefix = "snap/";
84	mUseForcedColors = false;
85	mRenderBoxes = false;
86	// mUseGlLists = true;
87	mUseGlLists = false;
88	}
89
90	GlRenderer::~GlRenderer()
91	{
92	cerr<<"gl renderer destructor..\n";
93
94	//CLEAR_CONTAINER(sQueries);
95	CLEAR_CONTAINER(mOcclusionQueries);
96
97	cerr<<"done."<<endl;
98	}
99
100
101	void
102	GlRenderer::RenderTriangle(TriangleIntersectable *object)
103	{
104	Triangle3 &t = object->GetItem();
105	glBegin(GL_TRIANGLES);
106	glVertex3f(t.mVertices[0].x, t.mVertices[0].y, t.mVertices[0].z);
107	glVertex3f(t.mVertices[1].x, t.mVertices[1].y, t.mVertices[1].z);
108	glVertex3f(t.mVertices[2].x, t.mVertices[2].y, t.mVertices[2].z);
109	glEnd();
110	}
111
112	void
113	GlRenderer::RenderIntersectable(Intersectable *object)
114	{
115	if (object->Mailed())
116	return;
117	object->Mail();
118
119	glPushAttrib(GL_CURRENT_BIT);
120	if (mUseFalseColors)
121	SetupFalseColor(object->mId);
122
123
124	switch (object->Type()) {
125	case Intersectable::MESH_INSTANCE:
126	RenderMeshInstance((MeshInstance *)object);
127	break;
128	case Intersectable::VIEW_CELL:
129	RenderViewCell(dynamic_cast<ViewCell *>(object));
130	break;
131	case Intersectable::TRANSFORMED_MESH_INSTANCE:
132	RenderTransformedMeshInstance(dynamic_cast<TransformedMeshInstance *>(object));
133	break;
134	case Intersectable::TRIANGLE_INTERSECTABLE:
135	RenderTriangle(dynamic_cast<TriangleIntersectable *>(object));
136	break;
137	case Intersectable::BVH_INTERSECTABLE: {
138
139	BvhNode node = dynamic_cast<BvhNode >(object);
140
141	if (mRenderBoxes)
142	RenderBox(node->GetBoundingBox());
143	else
144	RenderBvhNode(node);
145	break;
146	}
147	case Intersectable::KD_INTERSECTABLE: {
148	KdNode node = (dynamic_cast<KdIntersectable >(object))->GetItem();
149
150	if (mRenderBoxes)
151	RenderBox(mKdTree->GetBox(node));
152	else
153	RenderKdNode(node);
154	break;
155	}
156
157	default:
158	cerr<<"Rendering this object not yet implemented\n";
159	break;
160	}
161
162	glPopAttrib();
163	}
164
165	void
166	GlRenderer::RenderRays(const VssRayContainer &rays)
167	{
168	VssRayContainer::const_iterator it = rays.begin(), it_end = rays.end();
169
170	glBegin(GL_LINES);
171	for (; it != it_end; ++it) {
172	VssRay ray = it;
173	float importance = log10(1e3*ray->mWeightedPvsContribution)/3.0f;
174	// cout<<"w="<<ray->mWeightedPvsContribution<<" r="<<ray->mWeightedPvsContribution;
175	glColor3f(importance, importance, importance);
176	glVertex3fv(&ray->mOrigin.x);
177	glVertex3fv(&ray->mTermination.x);
178	}
179	glEnd();
180	}
181
182
183
184	void
185	GlRenderer::RenderViewCell(ViewCell *vc)
186	{
187	if (vc->GetMesh()) {
188
189	if (!mUseFalseColors) {
190	if (vc->GetValid())
191	glColor3f(0,1,0);
192	else
193	glColor3f(0,0,1);
194	}
195
196	RenderMesh(vc->GetMesh());
197	} else {
198	// render viewcells in the subtree
199	if (!vc->IsLeaf()) {
200	ViewCellInterior vci = (ViewCellInterior ) vc;
201
202	ViewCellContainer::iterator it = vci->mChildren.begin();
203	for (; it != vci->mChildren.end(); ++it) {
204	RenderViewCell(*it);
205	}
206	} else {
207	// cerr<<"Empty viewcell mesh\n";
208	}
209	}
210	}
211
212
213	void
214	GlRenderer::RenderMeshInstance(MeshInstance *mi)
215	{
216	RenderMesh(mi->GetMesh());
217	}
218
219
220	void
221	GlRenderer::RenderTransformedMeshInstance(TransformedMeshInstance *mi)
222	{
223	// apply world transform before rendering
224	Matrix4x4 m;
225	mi->GetWorldTransform(m);
226
227	glPushMatrix();
228	/* cout << "\n";
229	for (int i = 0; i < 4; ++ i)
230	for (int j = 0; j < 4; ++ j)
231	cout << m.x[i][j] << " "; cout << "\n"*/
232
233	glMultMatrixf((float *)m.x);
234
235	/*GLfloat dummy[16];
236	glGetFloatv(GL_MODELVIEW_MATRIX, dummy);
237	for (int i = 0; i < 16; ++ i)
238	cout << dummy[i] << " ";
239	cout << endl;*/
240	RenderMesh(mi->GetMesh());
241
242	glPopMatrix();
243	}
244
245
246	void
247	GlRenderer::SetupFalseColor(const int id)
248	{
249	// swap bits of the color
250	glColor3ub(id&255, (id>>8)&255, (id>>16)&255);
251	}
252
253
254	int GlRenderer::GetId(int r, int g, int b) const
255	{
256	return r + (g << 8) + (b << 16);
257	}
258
259	void
260	GlRenderer::SetupMaterial(Material *m)
261	{
262	if (m)
263	glColor3fv(&(m->mDiffuseColor.r));
264	}
265
266	void
267	GlRenderer::RenderMesh(Mesh *mesh)
268	{
269	int i = 0;
270
271	if (!mUseFalseColors && !mUseForcedColors)
272	SetupMaterial(mesh->mMaterial);
273
274	for (i=0; i < mesh->mFaces.size(); i++) {
275	if (mWireFrame)
276	glBegin(GL_LINE_LOOP);
277	else
278	glBegin(GL_POLYGON);
279
280	Face *face = mesh->mFaces[i];
281	for (int j = 0; j < face->mVertexIndices.size(); j++) {
282	glVertex3fv(&mesh->mVertices[face->mVertexIndices[j]].x);
283	}
284	glEnd();
285	}
286	}
287
288	void
289	GlRenderer::InitGL()
290	{
291	mSphere = (GLUquadric *)gluNewQuadric();
292
293	glMatrixMode(GL_PROJECTION);
294	glLoadIdentity();
295
296	glMatrixMode(GL_MODELVIEW);
297	glLoadIdentity();
298
299	glFrontFace(GL_CCW);
300	glCullFace(GL_BACK);
301	glEnable(GL_CULL_FACE);
302	glShadeModel(GL_FLAT);
303	glEnable(GL_DEPTH_TEST);
304	glEnable(GL_CULL_FACE);
305
306	InitExtensions();
307
308	#if 0
309	GLfloat mat_ambient[] = { 0.5, 0.5, 0.5, 1.0 };
310	/* mat_specular and mat_shininess are NOT default values */
311	GLfloat mat_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
312	GLfloat mat_specular[] = { 0.3, 0.3, 0.3, 1.0 };
313	GLfloat mat_shininess[] = { 1.0 };
314
315	GLfloat light_ambient[] = { 0.2, 0.2, 0.2, 1.0 };
316	GLfloat light_diffuse[] = { 0.4, 0.4, 0.4, 1.0 };
317	GLfloat light_specular[] = { 0.3, 0.3, 0.3, 1.0 };
318
319	GLfloat lmodel_ambient[] = { 0.3, 0.3, 0.3, 1.0 };
320
321
322	// default Material
323	glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
324	glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
325	glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
326	glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
327
328	// a light
329	glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
330	glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
331	glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
332
333	glLightfv(GL_LIGHT1, GL_AMBIENT, light_ambient);
334	glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse);
335	glLightfv(GL_LIGHT1, GL_SPECULAR, light_specular);
336
337	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
338
339	glEnable(GL_LIGHTING);
340	glEnable(GL_LIGHT0);
341	glEnable(GL_LIGHT1);
342
343
344	// set position of the light
345	GLfloat infinite_light[] = { 1.0, 0.8, 1.0, 0.0 };
346	glLightfv (GL_LIGHT0, GL_POSITION, infinite_light);
347
348	// set position of the light2
349	GLfloat infinite_light2[] = { -0.3, 1.5, 1.0, 0.0 };
350	glLightfv (GL_LIGHT1, GL_POSITION, infinite_light2);
351
352	glColorMaterial( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
353	// glColorMaterial( GL_FRONT_AND_BACK, GL_SPECULAR);
354	glEnable(GL_COLOR_MATERIAL);
355
356	glShadeModel( GL_FLAT );
357
358	glDepthFunc( GL_LESS );
359	glEnable( GL_DEPTH_TEST );
360	#endif
361
362	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
363
364	glEnable( GL_NORMALIZE );
365
366	glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
367	}
368
369
370	void
371	GlRenderer::SetupProjection(const int w, const int h, const float angle)
372	{
373	glViewport(0, 0, w, h);
374	glMatrixMode(GL_PROJECTION);
375	glLoadIdentity();
376	gluPerspective(angle, 1.0, 0.1, 2.0*Magnitude(mSceneGraph->GetBox().Diagonal()));
377	glMatrixMode(GL_MODELVIEW);
378	}
379
380
381
382	void
383	GlRenderer::SetupCamera()
384	{
385	Vector3 target = mViewPoint + mViewDirection;
386
387	Vector3 up(0,1,0);
388
389	if (abs(DotProd(mViewDirection, up)) > 0.99f)
390	up = Vector3(1, 0, 0);
391
392	glLoadIdentity();
393	gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z,
394	target.x, target.y, target.z,
395	up.x, up.y, up.z);
396	}
397
398	void
399	GlRenderer::_RenderScene()
400	{
401	ObjectContainer::const_iterator oi = mObjects.begin();
402
403	for (; oi != mObjects.end(); oi++)
404	RenderIntersectable(*oi);
405	}
406
407	bool
408	GlRenderer::RenderScene()
409	{
410	Intersectable::NewMail();
411	static int glList = -1;
412	if (mUseGlLists) {
413	if (glList == -1) {
414	glList = glGenLists(1);
415	glNewList(glList, GL_COMPILE);
416	_RenderScene();
417	glEndList();
418	}
419	glCallList(glList);
420	} else
421	_RenderScene();
422
423
424	return true;
425	}
426
427
428	void
429	GlRendererBuffer::EvalQueryWithItemBuffer(
430	//RenderCostSample &sample
431	)
432	{
433	// read back the texture
434	glReadPixels(0, 0,
435	GetWidth(), GetHeight(),
436	GL_RGBA,
437	GL_UNSIGNED_BYTE,
438	mPixelBuffer);
439
440
441	unsigned int *p = mPixelBuffer;
442
443	for (int y = 0; y < GetHeight(); y++)
444	{
445	for (int x = 0; x < GetWidth(); x++, p++)
446	{
447	unsigned int id = (*p) & 0xFFFFFF;
448
449	if (id != 0xFFFFFF)
450	++ mObjects[id]->mCounter;
451	}
452	}
453	}
454
455
456
457	/****************************************************************/
458	/* GlRendererBuffer implementation */
459	/****************************************************************/
460
461
462
463	GlRendererBuffer::GlRendererBuffer(SceneGraph *sceneGraph,
464	ViewCellsManager *viewcells,
465	KdTree *tree):
466	GlRenderer(sceneGraph, viewcells, tree)
467	{
468	Environment::GetSingleton()->GetIntValue("Preprocessor.pvsRenderErrorSamples", mPvsStatFrames);
469	mPvsErrorBuffer.resize(mPvsStatFrames);
470	ClearErrorBuffer();
471
472	mPixelBuffer = NULL;
473
474	// implement width and height in subclasses
475	}
476
477
478	void
479	GlRendererBuffer::EvalQueryWithOcclusionQueries(
480	//RenderCostSample &sample
481	)
482	{
483	glDepthFunc(GL_LEQUAL);
484
485	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
486	glDepthMask(GL_FALSE);
487
488
489	// simulate detectemptyviewspace using backface culling
490	if (mDetectEmptyViewSpace)
491	{
492	glEnable(GL_CULL_FACE);
493	//cout << "culling" << endl;
494	}
495	else
496	{
497	//cout << "not culling" << endl;
498	glDisable(GL_CULL_FACE);
499	}
500
501
502	//const int numQ = 1;
503	const int numQ = (int)mOcclusionQueries.size();
504
505	//glFinish();
506	#if 0
507	//-- now issue queries for all objects
508	for (int j = 0; j < (int)mObjects.size(); ++ j)
509	{
510	mOcclusionQueries[j]->BeginQuery();
511	RenderIntersectable(mObjects[j]);
512	mOcclusionQueries[j]->EndQuery();
513
514	unsigned int pixelCount;
515
516	pixelCount = mOcclusionQueries[j]->GetQueryResult();
517	mObjects[j]->mCounter += pixelCount;
518	}
519	#else
520
521	int q = 0;
522
523	//-- now issue queries for all objects
524	for (int j = 0; j < (int)mObjects.size(); j += q)
525	{
526	for (q = 0; ((j + q) < (int)mObjects.size()) && (q < numQ); ++ q)
527	{
528	//glFinish();
529	mOcclusionQueries[q]->BeginQuery();
530
531	RenderIntersectable(mObjects[j + q]);
532
533	mOcclusionQueries[q]->EndQuery();
534	//glFinish();
535	}
536	//cout << "q: " << q << endl;
537	// collect results of the queries
538	for (int t = 0; t < q; ++ t)
539	{
540	unsigned int pixelCount;
541
542	//-- reenable other state
543	#if 0
544	bool available;
545
546	do
547	{
548	available = mOcclusionQueries[t]->ResultAvailable();
549
550	if (!available) cout << "W";
551	}
552	while (!available);
553	#endif
554
555	pixelCount = mOcclusionQueries[t]->GetQueryResult();
556
557	//if (pixelCount > 0)
558	// cout <<"o="<<j+q<<" q="<<mOcclusionQueries[q]->GetQueryId()<<" pc="<<pixelCount<<" ";
559	mObjects[j + t]->mCounter += pixelCount;
560	}
561
562	//j += q;
563	}
564	#endif
565	//glFinish();
566	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
567	glDepthMask(GL_TRUE);
568
569	glEnable(GL_CULL_FACE);
570	}
571
572
573	void
574	GlRendererBuffer::RandomViewPoint()
575	{
576	// do not use this function since it could return different viewpoints for
577	// different executions of the algorithm
578
579	// mViewCellsManager->GetViewPoint(mViewPoint);
580
581	while (1) {
582	Vector3 pVector = Vector3(halton.GetNumber(1),
583	halton.GetNumber(2),
584	halton.GetNumber(3));
585
586	mViewPoint = mViewCellsManager->GetViewSpaceBox().GetPoint(pVector);
587	ViewCell *v = mViewCellsManager->GetViewCell(mViewPoint);
588	if (v && v->GetValid())
589	break;
590	// generate a new vector
591	halton.GenerateNext();
592	}
593
594	Vector3 dVector = Vector3(2M_PIhalton.GetNumber(4),
595	M_PI*halton.GetNumber(5),
596	0.0f);
597
598	mViewDirection = Normalize(Vector3(sin(dVector.x),
599	// cos(dVector.y),
600	0.0f,
601	cos(dVector.x)));
602	halton.GenerateNext();
603	}
604
605
606	void
607	GlRenderer::RenderBox(const AxisAlignedBox3 &box)
608	{
609
610	glBegin(GL_LINE_LOOP);
611	glVertex3d(box.Min().x, box.Max().y, box.Min().z );
612	glVertex3d(box.Max().x, box.Max().y, box.Min().z );
613	glVertex3d(box.Max().x, box.Min().y, box.Min().z );
614	glVertex3d(box.Min().x, box.Min().y, box.Min().z );
615	glEnd();
616
617	glBegin(GL_LINE_LOOP);
618	glVertex3d(box.Min().x, box.Min().y, box.Max().z );
619	glVertex3d(box.Max().x, box.Min().y, box.Max().z );
620	glVertex3d(box.Max().x, box.Max().y, box.Max().z );
621	glVertex3d(box.Min().x, box.Max().y, box.Max().z );
622	glEnd();
623
624	glBegin(GL_LINE_LOOP);
625	glVertex3d(box.Max().x, box.Min().y, box.Min().z );
626	glVertex3d(box.Max().x, box.Min().y, box.Max().z );
627	glVertex3d(box.Max().x, box.Max().y, box.Max().z );
628	glVertex3d(box.Max().x, box.Max().y, box.Min().z );
629	glEnd();
630
631	glBegin(GL_LINE_LOOP);
632	glVertex3d(box.Min().x, box.Min().y, box.Min().z );
633	glVertex3d(box.Min().x, box.Min().y, box.Max().z );
634	glVertex3d(box.Min().x, box.Max().y, box.Max().z );
635	glVertex3d(box.Min().x, box.Max().y, box.Min().z );
636	glEnd();
637
638	glBegin(GL_LINE_LOOP);
639	glVertex3d(box.Min().x, box.Min().y, box.Min().z );
640	glVertex3d(box.Max().x, box.Min().y, box.Min().z );
641	glVertex3d(box.Max().x, box.Min().y, box.Max().z );
642	glVertex3d(box.Min().x, box.Min().y, box.Max().z );
643	glEnd();
644
645	glBegin(GL_LINE_LOOP);
646	glVertex3d(box.Min().x, box.Max().y, box.Min().z );
647	glVertex3d(box.Max().x, box.Max().y, box.Min().z );
648	glVertex3d(box.Max().x, box.Max().y, box.Max().z );
649	glVertex3d(box.Min().x, box.Max().y, box.Max().z );
650
651	glEnd();
652
653	}
654
655	void
656	GlRenderer::RenderBvhNode(BvhNode *node)
657	{
658	if (node->IsLeaf()) {
659	BvhLeaf leaf = (BvhLeaf ) node;
660
661	#if 0
662	if (leaf->mGlList == 0) {
663	leaf->mGlList = glGenLists(1);
664	if (leaf->mGlList != 0)
665	glNewList(leaf->mGlList, GL_COMPILE);
666
667	for (int i=0; i < leaf->mObjects.size(); i++)
668	RenderIntersectable(leaf->mObjects[i]);
669
670	if (leaf->mGlList != 0)
671	glEndList();
672	}
673
674	if (leaf->mGlList != 0)
675	glCallList(leaf->mGlList);
676	#else
677	for (int i=0; i < leaf->mObjects.size(); i++)
678	RenderIntersectable(leaf->mObjects[i]);
679	#endif
680	} else {
681	BvhInterior in = (BvhInterior )node;
682	RenderBvhNode(in->GetBack());
683	RenderBvhNode(in->GetFront());
684	}
685
686	//cout << "leaf obj " << i << endl;
687
688	}
689
690	void
691	GlRenderer::RenderKdNode(KdNode *node)
692	{
693	if (node->IsLeaf()) {
694	KdLeaf leaf = (KdLeaf ) node;
695	for (int i=0; i < leaf->mObjects.size(); i++) {
696	RenderIntersectable(leaf->mObjects[i]);
697	}
698	} else {
699	KdInterior in = (KdInterior )node;
700	RenderKdNode(in->mBack);
701	RenderKdNode(in->mFront);
702	}
703
704	}
705
706
707
708
709
710
711
712	void
713	GlRendererBuffer::EvalRenderCostSample(RenderCostSample &sample,
714	const bool useOcclusionQueries,
715	const int threshold
716	)
717	{
718	// choose a random view point
719	mViewCellsManager->GetViewPoint(mViewPoint);
720	sample.mPosition = mViewPoint;
721	//cout << "viewpoint: " << mViewPoint << endl;
722
723	// take a render cost sample by rendering a cube
724	Vector3 directions[6];
725
726	directions[0] = Vector3(1,0,0);
727	directions[1] = Vector3(0,1,0);
728	directions[2] = Vector3(0,0,1);
729	directions[3] = Vector3(-1,0,0);
730	directions[4] = Vector3(0,-1,0);
731	directions[5] = Vector3(0,0,-1);
732
733	sample.mVisibleObjects = 0;
734
735	// reset object counters
736	ObjectContainer::const_iterator it, it_end = mObjects.end();
737
738	for (it = mObjects.begin(); it != it_end; ++ it)
739	{
740	(*it)->mCounter = 0;
741	}
742
743	++ mFrame;
744
745	//glCullFace(GL_FRONT);
746	glCullFace(GL_BACK);
747	glDisable(GL_CULL_FACE);
748
749
750	// query all 6 directions for a full point sample
751	for (int i = 0; i < 6; ++ i)
752	{
753	mViewDirection = directions[i];
754	SetupCamera();
755
756	glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
757	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
758	//glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); glDepthMask(GL_TRUE);
759	glDepthFunc(GL_LESS);
760
761	mUseFalseColors = true;
762
763	// the actual scene rendering fills the depth (for occlusion queries)
764	// and the frame buffer (for item buffer)
765	RenderScene();
766
767
768	if (0)
769	{
770	char filename[256];
771	sprintf(filename, "snap/frame-%04d-%d.png", mFrame, i);
772	// QImage im = toImage();
773	// im.save(filename, "PNG");
774	}
775
776	// evaluate the sample
777	if (useOcclusionQueries)
778	{
779	EvalQueryWithOcclusionQueries();
780	}
781	else
782	{
783	EvalQueryWithItemBuffer();
784	}
785	}
786
787	// now evaluate the statistics over that sample
788	// currently only the number of visible objects is taken into account
789	sample.Reset();
790
791	for (it = mObjects.begin(); it != it_end; ++ it)
792	{
793	Intersectable obj = it;
794	if (obj->mCounter >= threshold)
795	{
796	++ sample.mVisibleObjects;
797	sample.mVisiblePixels += obj->mCounter;
798	}
799	}
800
801	//cout << "RS=" << sample.mVisibleObjects << " ";
802	}
803
804
805	GlRendererBuffer::~GlRendererBuffer()
806	{
807	#if USE_CG
808	if (sCgFragmentProgram)
809	cgDestroyProgram(sCgFragmentProgram);
810	if (sCgContext)
811	cgDestroyContext(sCgContext);
812	#endif
813	}
814
815
816	void
817	GlRendererBuffer::SampleRenderCost(const int numSamples,
818	vector<RenderCostSample> &samples,
819	const bool useOcclusionQueries,
820	const int threshold
821	)
822	{
823	MakeCurrent();
824
825	if (mPixelBuffer == NULL)
826	mPixelBuffer = new unsigned int[GetWidth()*GetHeight()];
827
828	// using 90 degree projection to capture 360 view with 6 samples
829	SetupProjection(GetHeight(), GetHeight(), 90.0f);
830
831	//samples.resize(numSamples);
832	halton.Reset();
833
834	// the number of queries queried in batch mode
835	const int numQ = 500;
836
837	//const int numQ = (int)mObjects.size();
838	if (useOcclusionQueries)
839	{
840	cout << "\ngenerating " << numQ << " queries ... ";
841	OcclusionQuery::GenQueries(mOcclusionQueries, numQ);
842	cout << "finished" << endl;
843	}
844
845	// sampling queries
846	for (int i = 0; i < numSamples; ++ i)
847	{
848	cout << ".";
849	EvalRenderCostSample(samples[i], useOcclusionQueries, threshold);
850	}
851
852	DoneCurrent();
853	}
854
855
856
857
858
859	void
860	GlRendererBuffer::ClearErrorBuffer()
861	{
862	for (int i=0; i < mPvsStatFrames; i++) {
863	mPvsErrorBuffer[i].mError = 1.0f;
864	}
865	}
866
867
868	void
869	GlRendererBuffer::EvalPvsStat()
870	{
871	mPvsStat.Reset();
872	halton.Reset();
873
874	MakeCurrent();
875
876	SetupProjection(GetWidth(), GetHeight());
877
878	cout<<"mPvsStatFrames="<<mPvsStatFrames<<endl;
879
880	for (int i=0; i < mPvsStatFrames; i++) {
881	float err;
882	// set frame id for saving the error buffer
883	mFrame = i;
884	RandomViewPoint();
885
886	// atlanta problematic frames: 325 525 691 1543
887	#if 0
888	if (mFrame != 325 &&
889	mFrame != 525 &&
890	mFrame != 691 &&
891	mFrame != 1543)
892	mPvsErrorBuffer[i] = -1;
893	else {
894	Debug<<"frame ="<<mFrame<<" vp="<<mViewPoint<<" vd="<<mViewDirection<<endl;
895	}
896	#endif
897
898	if (mPvsErrorBuffer[i].mError > 0.0f) {
899	int pvsSize;
900
901
902	float error = GetPixelError(pvsSize);
903	mPvsErrorBuffer[i].mError = error;
904	mPvsErrorBuffer[i].mPvsSize = pvsSize;
905
906	// emit UpdatePvsErrorItem(i,
907	// mPvsErrorBuffer[i]);
908
909	cout<<"("<<i<<","<<mPvsErrorBuffer[i].mError<<")";
910	// swapBuffers();
911	}
912
913	err = mPvsErrorBuffer[i].mError;
914
915	if (err >= 0.0f) {
916	if (err > mPvsStat.maxError)
917	mPvsStat.maxError = err;
918	mPvsStat.sumError += err;
919	mPvsStat.sumPvsSize += mPvsErrorBuffer[i].mPvsSize;
920
921	if (err == 0.0f)
922	mPvsStat.errorFreeFrames++;
923	mPvsStat.frames++;
924	}
925	}
926
927	glFinish();
928	DoneCurrent();
929
930	cout<<endl<<flush;
931	// mRenderingFinished.wakeAll();
932	}
933
934
935
936
937
938
939
940	void GlRendererBuffer::SampleBeamContributions(Intersectable *sourceObject,
941	Beam &beam,
942	const int desiredSamples,
943	BeamSampleStatistics &stat)
944	{
945	// TODO: should be moved out of here (not to be done every time)
946	// only back faces are interesting for the depth pass
947	glShadeModel(GL_FLAT);
948	glDisable(GL_LIGHTING);
949
950	// needed to kill the fragments for the front buffer
951	glEnable(GL_ALPHA_TEST);
952	glAlphaFunc(GL_GREATER, 0);
953
954	// assumes that the beam is constructed and contains kd-tree nodes
955	// and viewcells which it intersects
956
957
958	// Get the number of viewpoints to be sampled
959	// Now it is a sqrt but in general a wiser decision could be made.
960	// The less viewpoints the better for rendering performance, since less passes
961	// over the beam is needed.
962	// The viewpoints could actually be generated outside of the bounding box which
963	// would distribute the 'efective viewpoints' of the object surface and thus
964	// with a few viewpoints better sample the viewpoint space....
965
966	//TODO: comment in
967	//int viewPointSamples = sqrt((float)desiredSamples);
968	int viewPointSamples = max(desiredSamples / (GetWidth() * GetHeight()), 1);
969
970	// the number of direction samples per pass is given by the number of viewpoints
971	int directionalSamples = desiredSamples / viewPointSamples;
972
973	Debug << "directional samples: " << directionalSamples << endl;
974	for (int i = 0; i < viewPointSamples; ++ i)
975	{
976	Vector3 viewPoint = beam.mBox.GetRandomPoint();
977
978	// perhaps the viewpoint should be shifted back a little bit so that it always lies
979	// inside the source object
980	// 'ideally' the viewpoints would be distributed on the soureObject surface, but this
981	// would require more complicated sampling (perhaps hierarchical rejection sampling of
982	// the object surface is an option here - only the mesh faces which are inside the box
983	// are considered as candidates)
984
985	SampleViewpointContributions(sourceObject,
986	viewPoint,
987	beam,
988	directionalSamples,
989	stat);
990	}
991
992
993	// note:
994	// this routine would be called only if the number of desired samples is sufficiently
995	// large - for other rss tree cells the cpu based sampling is perhaps more efficient
996	// distributing the work between cpu and gpu would also allow us to place more sophisticated
997	// sample distributions (silhouette ones) using the cpu and the jittered once on the GPU
998	// in order that thios scheme is working well the gpu render buffer should run in a separate
999	// thread than the cpu sampler, which would not be such a big problem....
1000
1001	// disable alpha test again
1002	glDisable(GL_ALPHA_TEST);
1003	}
1004
1005
1006
1007	void GlRendererBuffer::SampleViewpointContributions(Intersectable *sourceObject,
1008	const Vector3 viewPoint,
1009	Beam &beam,
1010	const int samples,
1011	BeamSampleStatistics &stat)
1012	{
1013	// 1. setup the view port to match the desired samples
1014	glViewport(0, 0, samples, samples);
1015
1016	// 2. setup the projection matrix and view matrix to match the viewpoint + beam.mDirBox
1017	SetupProjectionForViewPoint(viewPoint, beam, sourceObject);
1018
1019
1020	// 3. reset z-buffer to 0 and render the source object for the beam
1021	// with glCullFace(Enabled) and glFrontFace(GL_CW)
1022	// save result to the front depth map
1023	// the front depth map holds ray origins
1024
1025
1026	// front depth buffer must be initialised to 0
1027	float clearDepth;
1028
1029	glGetFloatv(GL_DEPTH_CLEAR_VALUE, &clearDepth);
1030	glClearDepth(0.0f);
1031	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
1032
1033
1034	// glFrontFace(GL_CCW);
1035	glEnable(GL_CULL_FACE);
1036	glCullFace(GL_FRONT);
1037	glColorMask(0, 0, 0, 0);
1038
1039
1040	// stencil is increased where the source object is located
1041	glEnable(GL_STENCIL_TEST);
1042	glStencilFunc(GL_ALWAYS, 0x1, 0x1);
1043	glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
1044
1045
1046	#if 0
1047	static int glSourceObjList = -1;
1048	if (glSourceObjList != -1)
1049	{
1050	glSourceObjList = glGenLists(1);
1051	glNewList(glSourceObjList, GL_COMPILE);
1052
1053	RenderIntersectable(sourceObject);
1054
1055	glEndList();
1056	}
1057	glCallList(glSourceObjList);
1058
1059	#else
1060	RenderIntersectable(sourceObject);
1061
1062	#endif
1063
1064	// copy contents of the front depth buffer into depth texture
1065	glBindTexture(GL_TEXTURE_2D, frontDepthMap);
1066	glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, depthMapSize, depthMapSize);
1067
1068
1069	// reset clear function
1070	glClearDepth(clearDepth);
1071
1072
1073
1074	// 4. set up the termination depth buffer (= standard depth buffer)
1075	// only rays which have non-zero entry in the origin buffer are valid since
1076	// they realy start on the object surface (this is tagged by setting a
1077	// stencil buffer bit at step 3).
1078
1079	glStencilFunc(GL_EQUAL, 0x1, 0x1);
1080	glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
1081
1082	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
1083	glDepthMask(1);
1084
1085	glEnable(GL_DEPTH_TEST);
1086
1087	glEnable(GL_CULL_FACE);
1088	glCullFace(GL_BACK);
1089
1090	// setup front depth buffer
1091	glEnable(GL_TEXTURE_2D);
1092
1093	#if USE_CG
1094	// bind pixel shader implementing the front depth buffer functionality
1095	cgGLBindProgram(sCgFragmentProgram);
1096	cgGLEnableProfile(sCgFragmentProfile);
1097	#endif
1098
1099	// 5. render all objects inside the beam
1100	// we can use id based false color to read them back for gaining the pvs
1101
1102	glColorMask(1, 1, 1, 1);
1103
1104
1105	// if objects not stored in beam => extract objects
1106	if (beam.mFlags & !Beam::STORE_OBJECTS)
1107	{
1108	vector<KdNode *>::const_iterator it, it_end = beam.mKdNodes.end();
1109
1110	Intersectable::NewMail();
1111	for (it = beam.mKdNodes.begin(); it != it_end; ++ it)
1112	{
1113	mKdTree->CollectObjects(*it, beam.mObjects);
1114	}
1115	}
1116
1117
1118	// (objects can be compiled to a gl list now so that subsequent rendering for
1119	// this beam is fast - the same hold for step 3)
1120	// Afterwards we have two depth buffers defining the ray origin and termination
1121
1122
1123	#if 0
1124	static int glObjList = -1;
1125	if (glObjList != -1)
1126	{
1127	glObjList = glGenLists(1);
1128	glNewList(glObjList, GL_COMPILE);
1129
1130	ObjectContainer::const_iterator it, it_end = beam.mObjects.end();
1131	for (it = beam.mObjects.begin(); it != it_end; ++ it)
1132	{
1133	// render all objects except the source object
1134	if (*it != sourceObject)
1135	RenderIntersectable(*it);
1136	}
1137
1138	glEndList();
1139	}
1140
1141	glCallList(glObjList);
1142	#else
1143	ObjectContainer::const_iterator it, it_end = beam.mObjects.end();
1144	for (it = beam.mObjects.begin(); it != it_end; ++ it)
1145	{
1146	// render all objects except the source object
1147	if (*it != sourceObject)
1148	RenderIntersectable(*it);
1149	}
1150	#endif
1151
1152
1153
1154	// 6. Use occlusion queries for all viewcell meshes associated with the beam ->
1155	// a fragment passes if the corresponding stencil fragment is set and its depth is
1156	// between origin and termination buffer
1157
1158	// create new queries if necessary
1159	OcclusionQuery::GenQueries(mOcclusionQueries, (int)beam.mViewCells.size());
1160
1161	// check whether any backfacing polygon would pass the depth test?
1162	// matt: should check both back /front facing because of dual depth buffer
1163	// and danger of cutting the near plane with front facing polys.
1164
1165	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
1166	glDepthMask(GL_FALSE);
1167	glDisable(GL_CULL_FACE);
1168
1169
1170	ViewCellContainer::const_iterator vit, vit_end = beam.mViewCells.end();
1171
1172	int queryIdx = 0;
1173
1174	for (vit = beam.mViewCells.begin(); vit != vit_end; ++ vit)
1175	{
1176	mOcclusionQueries[queryIdx ++]->BeginQuery();
1177
1178	RenderIntersectable(*vit);
1179
1180	mOcclusionQueries[queryIdx]->EndQuery();
1181
1182	++ queryIdx;
1183	}
1184
1185
1186
1187	// at this point, if possible, go and do some other computation
1188
1189
1190
1191	// 7. The number of visible pixels is the number of sample rays which see the source
1192	// object from the corresponding viewcell -> remember these values for later update
1193	// of the viewcell pvs - or update immediately?
1194
1195	queryIdx = 0;
1196
1197	for (vit = beam.mViewCells.begin(); vit != vit_end; ++ vit)
1198	{
1199	// fetch queries
1200	unsigned int pixelCount = mOcclusionQueries[queryIdx ++]->GetQueryResult();
1201
1202	if (pixelCount)
1203	Debug << "view cell " << (*vit)->GetId() << " visible pixels: " << pixelCount << endl;
1204	}
1205
1206
1207	// 8. Copmpute rendering statistics
1208	// In general it is not neccessary to remember to extract all the rays cast. I hope it
1209	// would be sufficient to gain only the intergral statistics about the new contributions
1210	// and so the rss tree would actually store no new rays (only the initial ones)
1211	// the subdivision of the tree would only be driven by the statistics (the glrender could
1212	// evaluate the contribution entropy for example)
1213	// However might be an option to extract/store only those the rays which made a contribution
1214	// (new viewcell has been discovered) or relative contribution greater than a threshold ...
1215
1216	ObjectContainer pvsObj;
1217	stat.pvsSize = ComputePvs(beam.mObjects, pvsObj);
1218
1219	// to gain ray source and termination
1220	// copy contents of ray termination buffer into depth texture
1221	// and compare with ray source buffer
1222	#if 0
1223	VssRayContainer rays;
1224
1225	glBindTexture(GL_TEXTURE_2D, backDepthMap);
1226	glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, depthMapSize, depthMapSize);
1227
1228	ComputeRays(Intersectable *sourceObj, rays);
1229
1230	#endif
1231
1232
1233
1234	//-- cleanup
1235
1236
1237	// reset gl state
1238	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
1239	glDepthMask(GL_TRUE);
1240	glEnable(GL_CULL_FACE);
1241	glDisable(GL_STENCIL_TEST);
1242	#if USE_CG
1243	cgGLDisableProfile(sCgFragmentProfile);
1244	#endif
1245	glDisable(GL_TEXTURE_2D);
1246
1247	// remove objects from beam
1248	if (beam.mFlags & !Beam::STORE_OBJECTS)
1249	beam.mObjects.clear();
1250	}
1251
1252
1253	void GlRendererBuffer::SetupProjectionForViewPoint(const Vector3 &viewPoint,
1254	const Beam &beam,
1255	Intersectable *sourceObject)
1256	{
1257	float left, right, bottom, top, znear, zfar;
1258
1259	beam.ComputePerspectiveFrustum(left, right, bottom, top, znear, zfar,
1260	mSceneGraph->GetBox());
1261
1262	//Debug << left << " " << right << " " << bottom << " " << top << " " << znear << " " << zfar << endl;
1263	glMatrixMode(GL_PROJECTION);
1264	glLoadIdentity();
1265	glFrustum(left, right, bottom, top, znear, zfar);
1266	//glFrustum(-1, 1, -1, 1, 1, 20000);
1267
1268	const Vector3 center = viewPoint + beam.GetMainDirection() * (zfar - znear) * 0.3f;
1269	const Vector3 up =
1270	Normalize(CrossProd(beam.mPlanes[0].mNormal, beam.mPlanes[4].mNormal));
1271
1272	#ifdef GTP_DEBUG
1273	Debug << "view point: " << viewPoint << endl;
1274	Debug << "eye: " << center << endl;
1275	Debug << "up: " << up << endl;
1276	#endif
1277
1278	glMatrixMode(GL_MODELVIEW);
1279	glLoadIdentity();
1280	gluLookAt(viewPoint.x, viewPoint.y, viewPoint.z,
1281	center.x, center.y, center.z,
1282	up.x, up.y, up.z);
1283	}
1284
1285
1286	void GlRendererBuffer::InitGL()
1287	{
1288	MakeCurrent();
1289	GlRenderer::InitGL();
1290
1291	#if 1
1292	// initialise dual depth buffer textures
1293	glGenTextures(1, &frontDepthMap);
1294	glBindTexture(GL_TEXTURE_2D, frontDepthMap);
1295
1296	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, depthMapSize,
1297	depthMapSize, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);
1298
1299	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
1300	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
1301	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
1302	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
1303
1304	glGenTextures(1, &backDepthMap);
1305	glBindTexture(GL_TEXTURE_2D, backDepthMap);
1306
1307	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, depthMapSize,
1308	depthMapSize, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);
1309	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
1310	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
1311	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
1312	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
1313
1314
1315	#if USE_CG
1316	// cg initialization
1317	cgSetErrorCallback(handleCgError);
1318	sCgContext = cgCreateContext();
1319
1320	if (cgGLIsProfileSupported(CG_PROFILE_ARBFP1))
1321	sCgFragmentProfile = CG_PROFILE_ARBFP1;
1322	else
1323	{
1324	// try FP30
1325	if (cgGLIsProfileSupported(CG_PROFILE_FP30))
1326	sCgFragmentProfile = CG_PROFILE_FP30;
1327	else
1328	{
1329	Debug << "Neither arbfp1 or fp30 fragment profiles supported on this system" << endl;
1330	exit(1);
1331	}
1332	}
1333
1334	sCgFragmentProgram = cgCreateProgramFromFile(sCgContext,
1335	CG_SOURCE, "../src/dual_depth.cg",
1336	sCgFragmentProfile,
1337	NULL,
1338	NULL);
1339
1340	if (!cgIsProgramCompiled(sCgFragmentProgram))
1341	cgCompileProgram(sCgFragmentProgram);
1342
1343	cgGLLoadProgram(sCgFragmentProgram);
1344	cgGLBindProgram(sCgFragmentProgram);
1345
1346	Debug << "---- PROGRAM BEGIN ----\n" <<
1347	cgGetProgramString(sCgFragmentProgram, CG_COMPILED_PROGRAM) << "---- PROGRAM END ----\n";
1348
1349	#endif
1350
1351	#endif
1352	DoneCurrent();
1353	}
1354
1355
1356	void GlRendererBuffer::ComputeRays(Intersectable *sourceObj, VssRayContainer &rays)
1357	{
1358	for (int i = 0; i < depthMapSize * depthMapSize; ++ i)
1359	{
1360	//todo glGetTexImage()
1361	}
1362	}
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375	}

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