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OgreBiTerrainRenderable.cpp @ 2348

Revision 2348, 57.1 KB checked in by vizrt_christian_seidl, 17 years ago (diff)

BITerrain SceneManager?

Line
1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://www.ogre3d.org/
6
7	Copyright (c) 2000-2005 The OGRE Team
8	Also see acknowledgements in Readme.html
9
10	This program is free software; you can redistribute it and/or modify it under
11	the terms of the GNU Lesser General Public License as published by the Free Software
12	Foundation; either version 2 of the License, or (at your option) any later
13	version.
14
15	This program is distributed in the hope that it will be useful, but WITHOUT
16	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19	You should have received a copy of the GNU Lesser General Public License along with
20	this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21	Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22	http://www.gnu.org/copyleft/lesser.txt.
23	-----------------------------------------------------------------------------
24	*/
25	/***************************************************************************
26	terrainrenderable.cpp - description
27	-------------------
28	begin : Sat Oct 5 2002
29	copyright : (C) 2002 by Jon Anderson
30	email : janders@users.sf.net
31
32	Enhancements 2003 - 2004 (C) The OGRE Team
33
34	***************************************************************************/
35
36	#include "OgreBiTerrainRenderable.h"
37	#include "OgreSceneNode.h"
38	#include "OgreRenderQueue.h"
39	#include "OgreRenderOperation.h"
40	#include "OgreCamera.h"
41	#include "OgreRoot.h"
42	#include "OgreBiTerrainSceneManager.h"
43	#include "OgreLogManager.h"
44	#include "OgreStringConverter.h"
45	#include "OgreViewport.h"
46	#include "OgreException.h"
47
48	#pragma warning(disable : 4267)
49
50	namespace Ogre
51	{
52	//-----------------------------------------------------------------------
53	#define MAIN_BINDING 0
54	#define DELTA_BINDING 1
55	//-----------------------------------------------------------------------
56	//-----------------------------------------------------------------------
57	String BiTerrainRenderable::mType = "TerrainMipMap";
58	//-----------------------------------------------------------------------
59	//-----------------------------------------------------------------------
60	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
61	int BiTerrainRenderable::msCurrentRenderLevelIndex = 0;
62	#endif // GTP_VISIBILITY_MODIFIED_OGRE
63	//-----------------------------------------------------------------------
64	BiTerrainRenderable::BiTerrainRenderable(const String& name, BiTerrainSceneManager* tsm)
65	: Renderable(), MovableObject(name), mSceneManager(tsm), mTerrain(0), mDeltaBuffers(0), mPositionBuffer(0)
66	{
67	mForcedRenderLevel = -1;
68	mLastNextLevel = -1;
69
70	mMinLevelDistSqr = 0;
71
72	mInit = false;
73	mLightListDirty = true;
74	MovableObject::mCastShadows = false;
75
76	for ( int i = 0; i < 4; i++ )
77	{
78	mNeighbors[ i ] = 0;
79	}
80
81	mOptions = &(mSceneManager->getOptions());
82
83
84	}
85	//-----------------------------------------------------------------------
86	BiTerrainRenderable::~BiTerrainRenderable()
87	{
88
89	deleteGeometry();
90	}
91	//-----------------------------------------------------------------------
92	uint32 BiTerrainRenderable::getTypeFlags(void) const
93	{
94	// return world flag
95	return SceneManager::WORLD_GEOMETRY_TYPE_MASK;
96	}
97	//-----------------------------------------------------------------------
98	void BiTerrainRenderable::deleteGeometry()
99	{
100	if(mTerrain)
101	delete mTerrain;
102
103	if (mPositionBuffer)
104	delete [] mPositionBuffer;
105
106	if (mDeltaBuffers)
107	delete [] mDeltaBuffers;
108
109	if ( mMinLevelDistSqr != 0 )
110	delete [] mMinLevelDistSqr;
111	}
112	//-----------------------------------------------------------------------
113	void BiTerrainRenderable::initialise(int startx, int startz,
114	Real* pageHeightData)
115	{
116
117	if ( mOptions->maxGeoMipMapLevel != 0 )
118	{
119	uint i = ( uint ) 1 << ( mOptions->maxGeoMipMapLevel - 1 ) ;
120
121	if ( ( i + 1 ) > mOptions->tileSize )
122	{
123	printf( "Invalid maximum mipmap specifed, must be n, such that 2^(n-1)+1 < tileSize \n" );
124	return ;
125	}
126	}
127
128	deleteGeometry();
129
130	//calculate min and max heights;
131	Real min = 256000, max = 0;
132
133	mTerrain = new VertexData;
134	mTerrain->vertexStart = 0;
135	mTerrain->vertexCount = mOptions->tileSize * mOptions->tileSize;
136
137	VertexDeclaration* decl = mTerrain->vertexDeclaration;
138	VertexBufferBinding* bind = mTerrain->vertexBufferBinding;
139
140	// positions
141	size_t offset = 0;
142	decl->addElement(MAIN_BINDING, offset, VET_FLOAT3, VES_POSITION);
143	offset += VertexElement::getTypeSize(VET_FLOAT3);
144	if (mOptions->lit)
145	{
146	decl->addElement(MAIN_BINDING, offset, VET_FLOAT3, VES_NORMAL);
147	offset += VertexElement::getTypeSize(VET_FLOAT3);
148	}
149	// texture coord sets
150	decl->addElement(MAIN_BINDING, offset, VET_FLOAT2, VES_TEXTURE_COORDINATES, 0);
151	offset += VertexElement::getTypeSize(VET_FLOAT2);
152	decl->addElement(MAIN_BINDING, offset, VET_FLOAT2, VES_TEXTURE_COORDINATES, 1);
153	offset += VertexElement::getTypeSize(VET_FLOAT2);
154	if (mOptions->coloured)
155	{
156	decl->addElement(MAIN_BINDING, offset, VET_COLOUR, VES_DIFFUSE);
157	offset += VertexElement::getTypeSize(VET_COLOUR);
158	}
159
160	// Create shared vertex buffer
161	mMainBuffer =
162	HardwareBufferManager::getSingleton().createVertexBuffer(
163	decl->getVertexSize(MAIN_BINDING),
164	mTerrain->vertexCount,
165	HardwareBuffer::HBU_STATIC_WRITE_ONLY);
166	// Create system memory copy with just positions in it, for use in simple reads
167	mPositionBuffer = new float[mTerrain->vertexCount * 3];
168
169	bind->setBinding(MAIN_BINDING, mMainBuffer);
170
171	if (mOptions->lodMorph)
172	{
173	// Create additional element for delta
174	decl->addElement(DELTA_BINDING, 0, VET_FLOAT1, VES_BLEND_WEIGHTS);
175	// NB binding is not set here, it is set when deriving the LOD
176	}
177
178
179	mInit = true;
180
181	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
182	for (int i = 0; i < MAX_RENDERLEVEL_INDEX; ++i )
183	{
184	mRenderLevel[i] = 1;
185	}
186	#else
187	mRenderLevel = 1;
188	#endif // GTP_VISIBILITY_MODIFIED_OGRE
189
190	mMinLevelDistSqr = new Real[ mOptions->maxGeoMipMapLevel ];
191
192	int endx = startx + mOptions->tileSize;
193
194	int endz = startz + mOptions->tileSize;
195
196	Vector3 left, down, here;
197
198	const VertexElement* poselem = decl->findElementBySemantic(VES_POSITION);
199	const VertexElement* texelem0 = decl->findElementBySemantic(VES_TEXTURE_COORDINATES, 0);
200	const VertexElement* texelem1 = decl->findElementBySemantic(VES_TEXTURE_COORDINATES, 1);
201	float* pSysPos = mPositionBuffer;
202
203	unsigned char* pBase = static_cast<unsigned char*>(mMainBuffer->lock(HardwareBuffer::HBL_DISCARD));
204
205	for ( int j = startz; j < endz; j++ )
206	{
207	for ( int i = startx; i < endx; i++ )
208	{
209	float pPos, pTex0, *pTex1;
210	poselem->baseVertexPointerToElement(pBase, &pPos);
211	texelem0->baseVertexPointerToElement(pBase, &pTex0);
212	texelem1->baseVertexPointerToElement(pBase, &pTex1);
213
214	Real height = pageHeightData[j * mOptions->pageSize + i];
215	height = height * mOptions->scale.y; // scale height
216
217	pSysPos++ = pPos++ = ( float ) i * mOptions->scale.x; //x
218	pSysPos++ = pPos++ = height; // y
219	pSysPos++ = pPos++ = ( float ) j * mOptions->scale.z; //z
220
221	*pTex0++ = ( float ) i / ( float ) ( mOptions->pageSize - 1 );
222	*pTex0++ = ( float ) j / ( float ) ( mOptions->pageSize - 1 );
223
224	pTex1++ = ( ( float ) i / ( float ) ( mOptions->tileSize - 1 ) ) mOptions->detailTile;
225	pTex1++ = ( ( float ) j / ( float ) ( mOptions->tileSize - 1 ) ) mOptions->detailTile;
226
227	if ( height < min )
228	min = ( Real ) height;
229
230	if ( height > max )
231	max = ( Real ) height;
232
233	pBase += mMainBuffer->getVertexSize();
234	}
235	}
236
237	mMainBuffer->unlock();
238
239	mBounds.setExtents(
240	( Real ) startx * mOptions->scale.x,
241	min,
242	( Real ) startz * mOptions->scale.z,
243	( Real ) ( endx - 1 ) * mOptions->scale.x,
244	max,
245	( Real ) ( endz - 1 ) * mOptions->scale.z );
246
247
248	mCenter = Vector3( ( startx * mOptions->scale.x + (endx - 1) * mOptions->scale.x ) / 2,
249	( min + max ) / 2,
250	( startz * mOptions->scale.z + (endz - 1) * mOptions->scale.z ) / 2 );
251
252	mBoundingRadius =
253	std::max(max - min,
254	std::max((endx - 1 - startx) * mOptions->scale.x,
255	(endz - 1 - startz) * mOptions->scale.z)) / 2;
256
257	// Create delta buffer list if required to morph
258	if (mOptions->lodMorph)
259	{
260	// Create delta buffer for all except the lowest mip
261	mDeltaBuffers = new HardwareVertexBufferSharedPtr[mOptions->maxGeoMipMapLevel - 1];
262	}
263
264	Real C = _calculateCFactor();
265
266	_calculateMinLevelDist2( C );
267
268	}
269	//-----------------------------------------------------------------------
270	void BiTerrainRenderable::_getNormalAt( float x, float z, Vector3 * result )
271	{
272
273	assert(mOptions->lit && "No normals present");
274
275	Vector3 here, left, down;
276	here.x = x;
277	here.y = getHeightAt( x, z );
278	here.z = z;
279
280	left.x = x - 1;
281	left.y = getHeightAt( x - 1, z );
282	left.z = z;
283
284	down.x = x;
285	down.y = getHeightAt( x, z + 1 );
286	down.z = z + 1;
287
288	left = left - here;
289
290	down = down - here;
291
292	left.normalise();
293	down.normalise();
294
295	*result = left.crossProduct( down );
296	result -> normalise();
297
298	// result->x = - result->x;
299	// result->y = - result->y;
300	// result->z = - result->z;
301	}
302	//-----------------------------------------------------------------------
303	void BiTerrainRenderable::_calculateNormals()
304	{
305
306	Vector3 norm;
307
308	assert (mOptions->lit && "No normals present");
309
310	HardwareVertexBufferSharedPtr vbuf =
311	mTerrain->vertexBufferBinding->getBuffer(MAIN_BINDING);
312	const VertexElement* elem = mTerrain->vertexDeclaration->findElementBySemantic(VES_NORMAL);
313	unsigned char* pBase = static_cast<unsigned char*>( vbuf->lock(HardwareBuffer::HBL_DISCARD) );
314	float* pNorm;
315
316	for ( uint j = 0; j < mOptions->tileSize; j++ )
317	{
318	for ( uint i = 0; i < mOptions->tileSize; i++ )
319	{
320
321	_getNormalAt( _vertex( i, j, 0 ), _vertex( i, j, 2 ), &norm );
322
323	// printf( "Normal = %5f,%5f,%5f\n", norm.x, norm.y, norm.z );
324	elem->baseVertexPointerToElement(pBase, &pNorm);
325	*pNorm++ = norm.x;
326	*pNorm++ = norm.y;
327	*pNorm++ = norm.z;
328	pBase += vbuf->getVertexSize();
329	}
330
331	}
332	vbuf->unlock();
333	}
334	//-----------------------------------------------------------------------
335	void BiTerrainRenderable::_notifyCurrentCamera( Camera* cam )
336	{
337	MovableObject::_notifyCurrentCamera(cam);
338
339	if ( mForcedRenderLevel >= 0 )
340	{
341	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
342	mRenderLevel[msCurrentRenderLevelIndex] = mForcedRenderLevel;
343	#else
344	mRenderLevel = mForcedRenderLevel;
345	#endif // GTP_VISIBILITY_MODIFIED_OGRE
346	return ;
347	}
348
349
350	Vector3 cpos = cam -> getDerivedPosition();
351	const AxisAlignedBox& aabb = getWorldBoundingBox(true);
352	Vector3 diff(0, 0, 0);
353	diff.makeFloor(cpos - aabb.getMinimum());
354	diff.makeCeil(cpos - aabb.getMaximum());
355
356	Real L = diff.squaredLength();
357
358	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
359	mRenderLevel[msCurrentRenderLevelIndex] = -1;;
360	#else
361	mRenderLevel = -1;
362	#endif // GTP_VISIBILITY_MODIFIED_OGRE
363
364
365	for ( uint i = 0; i < mOptions->maxGeoMipMapLevel; i++ )
366	{
367	if ( mMinLevelDistSqr[ i ] > L )
368	{
369	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
370	mRenderLevel[msCurrentRenderLevelIndex] = i - 1;
371	#else
372	mRenderLevel = i - 1;
373	#endif // GTP_VISIBILITY_MODIFIED_OGRE
374	break;
375	}
376	}
377
378	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
379	if ( getRenderLevel() < 0 )
380	mRenderLevel[msCurrentRenderLevelIndex] = mOptions->maxGeoMipMapLevel - 1;
381	#else
382	if ( mRenderLevel < 0 )
383	mRenderLevel = mOptions->maxGeoMipMapLevel - 1;
384	#endif // GTP_VISIBILITY_MODIFIED_OGRE
385
386	if (mOptions->lodMorph)
387	{
388	// Get the next LOD level down
389	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
390	int nextLevel = mNextLevelDown[getRenderLevel()];
391	#else
392	int nextLevel = mNextLevelDown[mRenderLevel];
393	#endif // GTP_VISIBILITY_MODIFIED_OGRE
394	if (nextLevel == 0)
395	{
396	// No next level, so never morph
397	mLODMorphFactor = 0;
398	}
399	else
400	{
401	// Set the morph such that the morph happens in the last 0.25 of
402	// the distance range
403	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
404	Real range = mMinLevelDistSqr[nextLevel] - mMinLevelDistSqr[getRenderLevel()];
405	#else
406	Real range = mMinLevelDistSqr[nextLevel] - mMinLevelDistSqr[mRenderLevel];
407	#endif // GTP_VISIBILITY_MODIFIED_OGRE
408	if (range)
409	{
410	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
411	Real percent = (L - mMinLevelDistSqr[getRenderLevel()]) / range;
412	#else
413	Real percent = (L - mMinLevelDistSqr[mRenderLevel]) / range;
414	#endif // GTP_VISIBILITY_MODIFIED_OGRE
415	// scale result so that msLODMorphStart == 0, 1 == 1, clamp to 0 below that
416	Real rescale = 1.0f / (1.0f - mOptions->lodMorphStart);
417	mLODMorphFactor = std::max((percent - mOptions->lodMorphStart) * rescale,
418	static_cast<Real>(0.0));
419	}
420	else
421	{
422	// Identical ranges
423	mLODMorphFactor = 0.0f;
424	}
425
426	assert(mLODMorphFactor >= 0 && mLODMorphFactor <= 1);
427	}
428
429	// Bind the correct delta buffer if it has changed
430	// nextLevel - 1 since the first entry is for LOD 1 (since LOD 0 never needs it)
431	if (mLastNextLevel != nextLevel)
432	{
433	if (nextLevel > 0)
434	{
435	mTerrain->vertexBufferBinding->setBinding(DELTA_BINDING,
436	mDeltaBuffers[nextLevel - 1]);
437	}
438	else
439	{
440	// bind dummy (incase bindings checked)
441	mTerrain->vertexBufferBinding->setBinding(DELTA_BINDING,
442	mDeltaBuffers[0]);
443	}
444	}
445	mLastNextLevel = nextLevel;
446
447	}
448
449	}
450	//-----------------------------------------------------------------------
451	void BiTerrainRenderable::_updateRenderQueue( RenderQueue* queue )
452	{
453	// Notify need to calculate light list when our sending to render queue
454	mLightListDirty = true;
455
456	queue->addRenderable( this );
457	}
458	//-----------------------------------------------------------------------
459	void BiTerrainRenderable::getRenderOperation( RenderOperation& op )
460	{
461	//setup indexes for vertices and uvs...
462
463	assert( mInit && "Uninitialized" );
464
465	op.useIndexes = true;
466	op.operationType = mOptions->useTriStrips ?
467	RenderOperation::OT_TRIANGLE_STRIP : RenderOperation::OT_TRIANGLE_LIST;
468	op.vertexData = mTerrain;
469	op.indexData = getIndexData();
470
471
472	}
473	//-----------------------------------------------------------------------
474	void BiTerrainRenderable::getWorldTransforms( Matrix4* xform ) const
475	{
476	*xform = mParentNode->_getFullTransform();
477	}
478	//-----------------------------------------------------------------------
479	const Quaternion& BiTerrainRenderable::getWorldOrientation(void) const
480	{
481	return mParentNode->_getDerivedOrientation();
482	}
483	//-----------------------------------------------------------------------
484	const Vector3& BiTerrainRenderable::getWorldPosition(void) const
485	{
486	return mParentNode->_getDerivedPosition();
487	}
488	//-----------------------------------------------------------------------
489	bool BiTerrainRenderable::_checkSize( int n )
490	{
491	for ( int i = 0; i < 10; i++ )
492	{
493	if ( ( ( 1 << i ) + 1 ) == n )
494	return true;
495	}
496
497	return false;
498	}
499	//-----------------------------------------------------------------------
500	void BiTerrainRenderable::_calculateMinLevelDist2( Real C )
501	{
502	//level 0 has no delta.
503	mMinLevelDistSqr[ 0 ] = 0;
504
505	int i, j;
506
507	for ( int level = 1; level < mOptions->maxGeoMipMapLevel; level++ )
508	{
509	mMinLevelDistSqr[ level ] = 0;
510
511	int step = 1 << level;
512	// The step of the next higher LOD
513	int higherstep = step >> 1;
514
515	float* pDeltas = 0;
516	if (mOptions->lodMorph)
517	{
518	// Create a set of delta values (store at index - 1 since 0 has none)
519	mDeltaBuffers[level - 1] = createDeltaBuffer();
520	// Lock, but don't discard (we want the pre-initialised zeros)
521	pDeltas = static_cast<float*>(
522	mDeltaBuffers[level - 1]->lock(HardwareBuffer::HBL_NORMAL));
523	}
524
525	for ( j = 0; j < mOptions->tileSize - step; j += step )
526	{
527	for ( i = 0; i < mOptions->tileSize - step; i += step )
528	{
529	/* Form planes relating to the lower detail tris to be produced
530	For tri lists and even tri strip rows, they are this shape:
531	x---x
532	\| / \|
533	x---x
534	For odd tri strip rows, they are this shape:
535	x---x
536	\| \ \|
537	x---x
538	*/
539
540	Vector3 v1(_vertex( i, j, 0 ), _vertex( i, j, 1 ), _vertex( i, j, 2 ));
541	Vector3 v2(_vertex( i + step, j, 0 ), _vertex( i + step, j, 1 ), _vertex( i + step, j, 2 ));
542	Vector3 v3(_vertex( i, j + step, 0 ), _vertex( i, j + step, 1 ), _vertex( i, j + step, 2 ));
543	Vector3 v4(_vertex( i + step, j + step, 0 ), _vertex( i + step, j + step, 1 ), _vertex( i + step, j + step, 2 ));
544
545	Plane t1, t2;
546	bool backwardTri = false;
547	if (!mOptions->useTriStrips \|\| j % 2 == 0)
548	{
549	t1.redefine(v1, v3, v2);
550	t2.redefine(v2, v3, v4);
551	}
552	else
553	{
554	t1.redefine(v1, v3, v4);
555	t2.redefine(v1, v4, v2);
556	backwardTri = true;
557	}
558
559	// include the bottommost row of vertices if this is the last row
560	int zubound = (j == (mOptions->tileSize - step)? step : step - 1);
561	for ( int z = 0; z <= zubound; z++ )
562	{
563	// include the rightmost col of vertices if this is the last col
564	int xubound = (i == (mOptions->tileSize - step)? step : step - 1);
565	for ( int x = 0; x <= xubound; x++ )
566	{
567	int fulldetailx = i + x;
568	int fulldetailz = j + z;
569	if ( fulldetailx % step == 0 &&
570	fulldetailz % step == 0 )
571	{
572	// Skip, this one is a vertex at this level
573	continue;
574	}
575
576	Real zpct = (Real)z / (Real)step;
577	Real xpct = (Real)x / (Real)step;
578
579	//interpolated height
580	Vector3 actualPos(
581	_vertex( fulldetailx, fulldetailz, 0 ),
582	_vertex( fulldetailx, fulldetailz, 1 ),
583	_vertex( fulldetailx, fulldetailz, 2 ));
584	Real interp_h;
585	// Determine which tri we're on
586	if ((xpct + zpct <= 1.0f && !backwardTri) \|\|
587	(xpct + (1-zpct) <= 1.0f && backwardTri))
588	{
589	// Solve for x/z
590	interp_h =
591	(-(t1.normal.x * actualPos.x)
592	- t1.normal.z * actualPos.z
593	- t1.d) / t1.normal.y;
594	}
595	else
596	{
597	// Second tri
598	interp_h =
599	(-(t2.normal.x * actualPos.x)
600	- t2.normal.z * actualPos.z
601	- t2.d) / t2.normal.y;
602	}
603
604	Real actual_h = _vertex( fulldetailx, fulldetailz, 1 );
605	Real delta = fabs( interp_h - actual_h );
606
607	Real D2 = delta * delta * C * C;
608
609	if ( mMinLevelDistSqr[ level ] < D2 )
610	mMinLevelDistSqr[ level ] = D2;
611
612	// Should be save height difference?
613	// Don't morph along edges
614	if (mOptions->lodMorph &&
615	fulldetailx != 0 && fulldetailx != (mOptions->tileSize - 1) &&
616	fulldetailz != 0 && fulldetailz != (mOptions->tileSize - 1) )
617	{
618	// Save height difference
619	pDeltas[fulldetailx + (fulldetailz * mOptions->tileSize)] =
620	interp_h - actual_h;
621	}
622
623	}
624
625	}
626	}
627	}
628
629	// Unlock morph deltas if required
630	if (mOptions->lodMorph)
631	{
632	mDeltaBuffers[level - 1]->unlock();
633	}
634	}
635
636
637
638	// Post validate the whole set
639	for ( i = 1; i < mOptions->maxGeoMipMapLevel; i++ )
640	{
641
642	// Make sure no LOD transition within the tile
643	// This is especially a problem when using large tiles with flat areas
644	/* Hmm, this can look bad on some areas, disable for now
645	Vector3 delta(_vertex(0,0,0), mCenter.y, _vertex(0,0,2));
646	delta = delta - mCenter;
647	Real minDist = delta.squaredLength();
648	mMinLevelDistSqr[ i ] = std::max(mMinLevelDistSqr[ i ], minDist);
649	*/
650
651	//make sure the levels are increasing...
652	if ( mMinLevelDistSqr[ i ] < mMinLevelDistSqr[ i - 1 ] )
653	{
654	mMinLevelDistSqr[ i ] = mMinLevelDistSqr[ i - 1 ];
655	}
656	}
657
658	// Now reverse traverse the list setting the 'next level down'
659	Real lastDist = -1;
660	int lastIndex = 0;
661	for (i = mOptions->maxGeoMipMapLevel - 1; i >= 0; --i)
662	{
663	if (i == mOptions->maxGeoMipMapLevel - 1)
664	{
665	// Last one is always 0
666	lastIndex = i;
667	lastDist = mMinLevelDistSqr[i];
668	mNextLevelDown[i] = 0;
669	}
670	else
671	{
672	mNextLevelDown[i] = lastIndex;
673	if (mMinLevelDistSqr[i] != lastDist)
674	{
675	lastIndex = i;
676	lastDist = mMinLevelDistSqr[i];
677	}
678	}
679
680	}
681
682
683	}
684	//-----------------------------------------------------------------------
685	void BiTerrainRenderable::_adjustRenderLevel( int i )
686	{
687
688	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
689	mRenderLevel[msCurrentRenderLevelIndex] = i;
690	#else
691	mRenderLevel = i;
692	#endif // GTP_VISIBILITY_MODIFIED_OGRE
693	}
694	//-----------------------------------------------------------------------
695	Real BiTerrainRenderable::_calculateCFactor()
696	{
697	Real A, T;
698
699	if (!mOptions->primaryCamera)
700	{
701	OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND,
702	"You have not created a camera yet!",
703	"BiTerrainRenderable::_calculateCFactor");
704	}
705
706	//A = 1 / Math::Tan(Math::AngleUnitsToRadians(opts.primaryCamera->getFOVy()));
707	// Turn off detail compression at higher FOVs
708	A = 1.0f;
709
710	int vertRes = mOptions->primaryCamera->getViewport()->getActualHeight();
711
712	T = 2 * ( Real ) mOptions->maxPixelError / ( Real ) vertRes;
713
714	return A / T;
715	}
716	//-----------------------------------------------------------------------
717	float BiTerrainRenderable::getHeightAt( float x, float z )
718	{
719	Vector3 start;
720	Vector3 end;
721
722	start.x = _vertex( 0, 0, 0 );
723	start.y = _vertex( 0, 0, 1 );
724	start.z = _vertex( 0, 0, 2 );
725
726	end.x = _vertex( mOptions->tileSize - 1, mOptions->tileSize - 1, 0 );
727	end.y = _vertex( mOptions->tileSize - 1, mOptions->tileSize - 1, 1 );
728	end.z = _vertex( mOptions->tileSize - 1, mOptions->tileSize - 1, 2 );
729
730	/* Safety catch, if the point asked for is outside
731	* of this tile, it will ask the appropriate tile
732	*/
733
734	if ( x < start.x )
735	{
736	if ( mNeighbors[ WEST ] != 0 )
737	return mNeighbors[ WEST ] ->getHeightAt( x, z );
738	else
739	x = start.x;
740	}
741
742	if ( x > end.x )
743	{
744	if ( mNeighbors[ EAST ] != 0 )
745	return mNeighbors[ EAST ] ->getHeightAt( x, z );
746	else
747	x = end.x;
748	}
749
750	if ( z < start.z )
751	{
752	if ( mNeighbors[ NORTH ] != 0 )
753	return mNeighbors[ NORTH ] ->getHeightAt( x, z );
754	else
755	z = start.z;
756	}
757
758	if ( z > end.z )
759	{
760	if ( mNeighbors[ SOUTH ] != 0 )
761	return mNeighbors[ SOUTH ] ->getHeightAt( x, z );
762	else
763	z = end.z;
764	}
765
766
767
768	float x_pct = ( x - start.x ) / ( end.x - start.x );
769	float z_pct = ( z - start.z ) / ( end.z - start.z );
770
771	float x_pt = x_pct * ( float ) ( mOptions->tileSize - 1 );
772	float z_pt = z_pct * ( float ) ( mOptions->tileSize - 1 );
773
774	int x_index = ( int ) x_pt;
775	int z_index = ( int ) z_pt;
776
777	// If we got to the far right / bottom edge, move one back
778	if (x_index == mOptions->tileSize - 1)
779	{
780	--x_index;
781	x_pct = 1.0f;
782	}
783	else
784	{
785	// get remainder
786	x_pct = x_pt - x_index;
787	}
788	if (z_index == mOptions->tileSize - 1)
789	{
790	--z_index;
791	z_pct = 1.0f;
792	}
793	else
794	{
795	z_pct = z_pt - z_index;
796	}
797
798	//bilinear interpolate to find the height.
799
800	float t1 = _vertex( x_index, z_index, 1 );
801	float t2 = _vertex( x_index + 1, z_index, 1 );
802	float b1 = _vertex( x_index, z_index + 1, 1 );
803	float b2 = _vertex( x_index + 1, z_index + 1, 1 );
804
805	float midpoint = (b1 + t2) / 2.0;
806
807	if (x_pct + z_pct <= 1) {
808	b2 = midpoint + (midpoint - t1);
809	} else {
810	t1 = midpoint + (midpoint - b2);
811	}
812
813	float t = ( t1 * ( 1 - x_pct ) ) + ( t2 * ( x_pct ) );
814	float b = ( b1 * ( 1 - x_pct ) ) + ( b2 * ( x_pct ) );
815
816	float h = ( t * ( 1 - z_pct ) ) + ( b * ( z_pct ) );
817
818	return h;
819	}
820	//-----------------------------------------------------------------------
821	bool BiTerrainRenderable::intersectSegment( const Vector3 & start, const Vector3 & end, Vector3 * result )
822	{
823	Vector3 dir = end - start;
824	Vector3 ray = start;
825
826	//special case...
827	if ( dir.x == 0 && dir.z == 0 )
828	{
829	if ( ray.y <= getHeightAt( ray.x, ray.z ) )
830	{
831	if ( result != 0 )
832	* result = start;
833
834	return true;
835	}
836	}
837
838	dir.normalise();
839
840	//dir.x *= mScale.x;
841	//dir.y *= mScale.y;
842	//dir.z *= mScale.z;
843
844	const Vector3 * corners = getBoundingBox().getAllCorners();
845
846	//start with the next one...
847	ray += dir;
848
849
850	while ( ! ( ( ray.x < corners[ 0 ].x ) \|\|
851	( ray.x > corners[ 4 ].x ) \|\|
852	( ray.z < corners[ 0 ].z ) \|\|
853	( ray.z > corners[ 4 ].z ) ) )
854	{
855
856
857	float h = getHeightAt( ray.x, ray.z );
858
859	if ( ray.y <= h )
860	{
861	if ( result != 0 )
862	* result = ray;
863
864	return true;
865	}
866
867	else
868	{
869	ray += dir;
870	}
871
872	}
873
874	if ( ray.x < corners[ 0 ].x && mNeighbors[ WEST ] != 0 )
875	return mNeighbors[ WEST ] ->intersectSegment( ray, end, result );
876	else if ( ray.z < corners[ 0 ].z && mNeighbors[ NORTH ] != 0 )
877	return mNeighbors[ NORTH ] ->intersectSegment( ray, end, result );
878	else if ( ray.x > corners[ 4 ].x && mNeighbors[ EAST ] != 0 )
879	return mNeighbors[ EAST ] ->intersectSegment( ray, end, result );
880	else if ( ray.z > corners[ 4 ].z && mNeighbors[ SOUTH ] != 0 )
881	return mNeighbors[ SOUTH ] ->intersectSegment( ray, end, result );
882	else
883	{
884	if ( result != 0 )
885	* result = Vector3( -1, -1, -1 );
886
887	return false;
888	}
889	}
890	//-----------------------------------------------------------------------
891	void BiTerrainRenderable::_generateVertexLighting( const Vector3 &sun, ColourValue ambient )
892	{
893
894	Vector3 pt;
895	Vector3 normal;
896	Vector3 light;
897
898	HardwareVertexBufferSharedPtr vbuf =
899	mTerrain->vertexBufferBinding->getBuffer(MAIN_BINDING);
900	const VertexElement* elem = mTerrain->vertexDeclaration->findElementBySemantic(VES_DIFFUSE);
901	//for each point in the terrain, see if it's in the line of sight for the sun.
902	for ( size_t i = 0; i < mOptions->tileSize; i++ )
903	{
904	for ( size_t j = 0; j < mOptions->tileSize; j++ )
905	{
906	// printf( "Checking %f,%f,%f ", pt.x, pt.y, pt.z );
907	pt.x = _vertex( i, j, 0 );
908	pt.y = _vertex( i, j, 1 );
909	pt.z = _vertex( i, j, 2 );
910
911	light = sun - pt;
912
913	light.normalise();
914
915	if ( ! intersectSegment( pt, sun, 0 ) )
916	{
917	//
918	_getNormalAt( _vertex( i, j, 0 ), _vertex( i, j, 2 ), &normal );
919
920	float l = light.dotProduct( normal );
921
922	ColourValue v;
923	v.r = ambient.r + l;
924	v.g = ambient.g + l;
925	v.b = ambient.b + l;
926
927	if ( v.r > 1 ) v.r = 1;
928
929	if ( v.g > 1 ) v.g = 1;
930
931	if ( v.b > 1 ) v.b = 1;
932
933	if ( v.r < 0 ) v.r = 0;
934
935	if ( v.g < 0 ) v.g = 0;
936
937	if ( v.b < 0 ) v.b = 0;
938
939	RGBA colour;
940	Root::getSingleton().convertColourValue( v, &colour );
941	vbuf->writeData(
942	(_index( i, j ) * vbuf->getVertexSize()) + elem->getOffset(),
943	sizeof(RGBA), &colour);
944	}
945
946	else
947	{
948	RGBA colour;
949	Root::getSingleton().convertColourValue( ambient, &colour );
950
951	vbuf->writeData(
952	(_index( i, j ) * vbuf->getVertexSize()) + elem->getOffset(),
953	sizeof(RGBA), &colour);
954	}
955
956	}
957
958	}
959
960	printf( "." );
961	}
962	//-----------------------------------------------------------------------
963	Real BiTerrainRenderable::getSquaredViewDepth(const Camera* cam) const
964	{
965	Vector3 diff = mCenter - cam->getDerivedPosition();
966	// Use squared length to avoid square root
967	return diff.squaredLength();
968	}
969
970	//-----------------------------------------------------------------------
971	const LightList& BiTerrainRenderable::getLights(void) const
972	{
973	if (mLightListDirty)
974	{
975	getParentSceneNode()->getCreator()->_populateLightList(
976	mCenter, this->getBoundingRadius(), mLightList);
977	mLightListDirty = false;
978	}
979	return mLightList;
980	}
981	//-----------------------------------------------------------------------
982	IndexData* BiTerrainRenderable::getIndexData(void)
983	{
984	unsigned int stitchFlags = 0;
985	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
986	if ( mNeighbors[ EAST ] != 0 && mNeighbors[ EAST ] -> getRenderLevel() > getRenderLevel() )
987	{
988	stitchFlags \|= STITCH_EAST;
989	stitchFlags \|=
990	(mNeighbors[ EAST ] -> getRenderLevel() - getRenderLevel()) << STITCH_EAST_SHIFT;
991	}
992
993	if ( mNeighbors[ WEST ] != 0 && mNeighbors[ WEST ] -> getRenderLevel() > getRenderLevel() )
994	{
995	stitchFlags \|= STITCH_WEST;
996	stitchFlags \|=
997	(mNeighbors[ WEST ] -> getRenderLevel() - getRenderLevel()) << STITCH_WEST_SHIFT;
998	}
999
1000	if ( mNeighbors[ NORTH ] != 0 && mNeighbors[ NORTH ] -> getRenderLevel() > getRenderLevel() )
1001	{
1002	stitchFlags \|= STITCH_NORTH;
1003	stitchFlags \|=
1004	(mNeighbors[ NORTH ] -> getRenderLevel() - getRenderLevel()) << STITCH_NORTH_SHIFT;
1005	}
1006
1007	if ( mNeighbors[ SOUTH ] != 0 && mNeighbors[ SOUTH ] -> getRenderLevel() > getRenderLevel() )
1008	{
1009	stitchFlags \|= STITCH_SOUTH;
1010	stitchFlags \|=
1011	(mNeighbors[ SOUTH ] -> getRenderLevel() - getRenderLevel()) << STITCH_SOUTH_SHIFT;
1012	}
1013	#else
1014	if ( mNeighbors[ EAST ] != 0 && mNeighbors[ EAST ] -> mRenderLevel > mRenderLevel )
1015	{
1016	stitchFlags \|= STITCH_EAST;
1017	stitchFlags \|=
1018	(mNeighbors[ EAST ] -> mRenderLevel - mRenderLevel) << STITCH_EAST_SHIFT;
1019	}
1020
1021	if ( mNeighbors[ WEST ] != 0 && mNeighbors[ WEST ] -> mRenderLevel > mRenderLevel )
1022	{
1023	stitchFlags \|= STITCH_WEST;
1024	stitchFlags \|=
1025	(mNeighbors[ WEST ] -> mRenderLevel - mRenderLevel) << STITCH_WEST_SHIFT;
1026	}
1027
1028	if ( mNeighbors[ NORTH ] != 0 && mNeighbors[ NORTH ] -> mRenderLevel > mRenderLevel )
1029	{
1030	stitchFlags \|= STITCH_NORTH;
1031	stitchFlags \|=
1032	(mNeighbors[ NORTH ] -> mRenderLevel - mRenderLevel) << STITCH_NORTH_SHIFT;
1033	}
1034
1035	if ( mNeighbors[ SOUTH ] != 0 && mNeighbors[ SOUTH ] -> mRenderLevel > mRenderLevel )
1036	{
1037	stitchFlags \|= STITCH_SOUTH;
1038	stitchFlags \|=
1039	(mNeighbors[ SOUTH ] -> mRenderLevel - mRenderLevel) << STITCH_SOUTH_SHIFT;
1040	}
1041	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1042	// Check preexisting
1043	LevelArray& levelIndex = mSceneManager->_getLevelIndex();
1044	/* msz: added for v1-2-0 compatibility */
1045	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1046	IndexMap::iterator ii = levelIndex[ getRenderLevel() ]->find( stitchFlags );
1047	#else
1048	IndexMap::iterator ii = levelIndex[ mRenderLevel ]->find( stitchFlags );
1049	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1050	IndexData* indexData;
1051	/* msz: added for v1-2-0 compatibility */
1052	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1053	if ( ii == levelIndex[ getRenderLevel() ]->end())
1054	#else
1055	if ( ii == levelIndex[ mRenderLevel ]->end())
1056	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1057	{
1058	// Create
1059	if (mOptions->useTriStrips)
1060	{
1061	indexData = generateTriStripIndexes(stitchFlags);
1062	}
1063	else
1064	{
1065	indexData = generateTriListIndexes(stitchFlags);
1066	}
1067	/* msz: added for v1-2-0 compatibility */
1068	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1069	levelIndex[ getRenderLevel() ]->insert(
1070	IndexMap::value_type(stitchFlags, indexData));
1071	#else
1072	levelIndex[ mRenderLevel ]->insert(
1073	IndexMap::value_type(stitchFlags, indexData));
1074	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1075	}
1076	else
1077	{
1078	indexData = ii->second;
1079	}
1080
1081
1082	return indexData;
1083
1084
1085	}
1086	//-----------------------------------------------------------------------
1087	IndexData* BiTerrainRenderable::generateTriStripIndexes(unsigned int stitchFlags)
1088	{
1089	/* msz: added for v1-2-0 compatibility */
1090	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1091	// The step used for the current level
1092	int step = 1 << getRenderLevel();
1093	// The step used for the lower level
1094	int lowstep = 1 << (getRenderLevel() + 1);
1095	#else
1096	// The step used for the current level
1097	int step = 1 << mRenderLevel;
1098	// The step used for the lower level
1099	int lowstep = 1 << (mRenderLevel + 1);
1100	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1101
1102	int numIndexes = 0;
1103
1104	// Calculate the number of indexes required
1105	// This is the number of 'cells' at this detail level x 2
1106	// plus 3 degenerates to turn corners
1107	int numTrisAcross = (((mOptions->tileSize-1) / step) * 2) + 3;
1108	// Num indexes is number of tris + 2
1109	int new_length = numTrisAcross * ((mOptions->tileSize-1) / step) + 2;
1110	//this is the maximum for a level. It wastes a little, but shouldn't be a problem.
1111
1112	IndexData* indexData = new IndexData;
1113	indexData->indexBuffer =
1114	HardwareBufferManager::getSingleton().createIndexBuffer(
1115	HardwareIndexBuffer::IT_16BIT,
1116	new_length, HardwareBuffer::HBU_STATIC_WRITE_ONLY);//, false);
1117
1118	mSceneManager->_getIndexCache().mCache.push_back( indexData );
1119
1120	unsigned short* pIdx = static_cast<unsigned short*>(
1121	indexData->indexBuffer->lock(0,
1122	indexData->indexBuffer->getSizeInBytes(),
1123	HardwareBuffer::HBL_DISCARD));
1124
1125	// Stripified mesh
1126	for ( uint j = 0; j < mOptions->tileSize - 1; j += step )
1127	{
1128	uint i;
1129	// Forward strip
1130	// We just do the \|/ here, final \| done after
1131	for ( i = 0; i < mOptions->tileSize - 1; i += step )
1132	{
1133	int x[4], y[4];
1134	x[0] = x[1] = i;
1135	x[2] = x[3] = i + step;
1136	y[0] = y[2] = j;
1137	y[1] = y[3] = j + step;
1138
1139	if (j == 0 && (stitchFlags & STITCH_NORTH))
1140	{
1141	// North reduction means rounding x[0] and x[2]
1142	if (x[0] % lowstep != 0)
1143	{
1144	// Since we know we only drop down one level of LOD,
1145	// removing 1 step of higher LOD should return to lower
1146	x[0] -= step;
1147	}
1148	if (x[2] % lowstep != 0)
1149	{
1150	x[2] -= step;
1151	}
1152	}
1153
1154	// Never get a south tiling on a forward strip (always finish on
1155	// a backward strip)
1156
1157	if (i == 0 && (stitchFlags & STITCH_WEST))
1158	{
1159	// West reduction means rounding y[0] / y[1]
1160	if (y[0] % lowstep != 0)
1161	{
1162	y[0] -= step;
1163	}
1164	if (y[1] % lowstep != 0)
1165	{
1166	y[1] -= step;
1167	}
1168	}
1169	if (i == (mOptions->tileSize - 1 - step) && (stitchFlags & STITCH_EAST))
1170	{
1171	// East tiling means rounding y[2] & y[3]
1172	if (y[2] % lowstep != 0)
1173	{
1174	y[2] -= step;
1175	}
1176	if (y[3] % lowstep != 0)
1177	{
1178	y[3] -= step;
1179	}
1180	}
1181
1182	//triangles
1183	if (i == 0)
1184	{
1185	// Starter
1186	*pIdx++ = _index( x[0], y[0] ); numIndexes++;
1187	}
1188	*pIdx++ = _index( x[1], y[1] ); numIndexes++;
1189	*pIdx++ = _index( x[2], y[2] ); numIndexes++;
1190
1191	if (i == mOptions->tileSize - 1 - step)
1192	{
1193	// Emit extra index to finish row
1194	*pIdx++ = _index( x[3], y[3] ); numIndexes++;
1195	if (j < mOptions->tileSize - 1 - step)
1196	{
1197	// Emit this index twice more (this is to turn around without
1198	// artefacts)
1199	// ** Hmm, looks like we can drop this and it's unnoticeable
1200	//*pIdx++ = _index( x[3], y[3] ); numIndexes++;
1201	//*pIdx++ = _index( x[3], y[3] ); numIndexes++;
1202	}
1203	}
1204
1205	}
1206	// Increment row
1207	j += step;
1208	// Backward strip
1209	for ( i = mOptions->tileSize - 1; i > 0 ; i -= step )
1210	{
1211	int x[4], y[4];
1212	x[0] = x[1] = i;
1213	x[2] = x[3] = i - step;
1214	y[0] = y[2] = j;
1215	y[1] = y[3] = j + step;
1216
1217	// Never get a north tiling on a backward strip (always
1218	// start on a forward strip)
1219	if (j == (mOptions->tileSize - 1 - step) && (stitchFlags & STITCH_SOUTH))
1220	{
1221	// South reduction means rounding x[1] / x[3]
1222	if (x[1] % lowstep != 0)
1223	{
1224	x[1] -= step;
1225	}
1226	if (x[3] % lowstep != 0)
1227	{
1228	x[3] -= step;
1229	}
1230	}
1231
1232	if (i == step && (stitchFlags & STITCH_WEST))
1233	{
1234	// West tiling on backward strip is rounding of y[2] / y[3]
1235	if (y[2] % lowstep != 0)
1236	{
1237	y[2] -= step;
1238	}
1239	if (y[3] % lowstep != 0)
1240	{
1241	y[3] -= step;
1242	}
1243	}
1244	if (i == mOptions->tileSize - 1 && (stitchFlags & STITCH_EAST))
1245	{
1246	// East tiling means rounding y[0] and y[1] on backward strip
1247	if (y[0] % lowstep != 0)
1248	{
1249	y[0] -= step;
1250	}
1251	if (y[1] % lowstep != 0)
1252	{
1253	y[1] -= step;
1254	}
1255	}
1256
1257	//triangles
1258	if (i == mOptions->tileSize)
1259	{
1260	// Starter
1261	*pIdx++ = _index( x[0], y[0] ); numIndexes++;
1262	}
1263	*pIdx++ = _index( x[1], y[1] ); numIndexes++;
1264	*pIdx++ = _index( x[2], y[2] ); numIndexes++;
1265
1266	if (i == step)
1267	{
1268	// Emit extra index to finish row
1269	*pIdx++ = _index( x[3], y[3] ); numIndexes++;
1270	if (j < mOptions->tileSize - 1 - step)
1271	{
1272	// Emit this index once more (this is to turn around)
1273	*pIdx++ = _index( x[3], y[3] ); numIndexes++;
1274	}
1275	}
1276	}
1277	}
1278
1279
1280	indexData->indexBuffer->unlock();
1281	indexData->indexCount = numIndexes;
1282	indexData->indexStart = 0;
1283
1284	return indexData;
1285
1286	}
1287	//-----------------------------------------------------------------------
1288	IndexData* BiTerrainRenderable::generateTriListIndexes(unsigned int stitchFlags)
1289	{
1290
1291	int numIndexes = 0;
1292	/* msz: added for v1-2-0 compatibility */
1293	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1294	int step = 1 << getRenderLevel();
1295	#else
1296	int step = 1 << mRenderLevel;
1297	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1298	IndexData* indexData = 0;
1299
1300	int north = stitchFlags & STITCH_NORTH ? step : 0;
1301	int south = stitchFlags & STITCH_SOUTH ? step : 0;
1302	int east = stitchFlags & STITCH_EAST ? step : 0;
1303	int west = stitchFlags & STITCH_WEST ? step : 0;
1304
1305	int new_length = ( mOptions->tileSize / step ) * ( mOptions->tileSize / step ) * 2 * 2 * 2 ;
1306	//this is the maximum for a level. It wastes a little, but shouldn't be a problem.
1307
1308	indexData = new IndexData;
1309	indexData->indexBuffer =
1310	HardwareBufferManager::getSingleton().createIndexBuffer(
1311	HardwareIndexBuffer::IT_16BIT,
1312	new_length, HardwareBuffer::HBU_STATIC_WRITE_ONLY);//, false);
1313
1314	mSceneManager->_getIndexCache().mCache.push_back( indexData );
1315
1316	unsigned short* pIdx = static_cast<unsigned short*>(
1317	indexData->indexBuffer->lock(0,
1318	indexData->indexBuffer->getSizeInBytes(),
1319	HardwareBuffer::HBL_DISCARD));
1320
1321	// Do the core vertices, minus stitches
1322	for ( uint j = north; j < mOptions->tileSize - 1 - south; j += step )
1323	{
1324	for ( uint i = west; i < mOptions->tileSize - 1 - east; i += step )
1325	{
1326	//triangles
1327	*pIdx++ = _index( i, j ); numIndexes++;
1328	*pIdx++ = _index( i, j + step ); numIndexes++;
1329	*pIdx++ = _index( i + step, j ); numIndexes++;
1330
1331	*pIdx++ = _index( i, j + step ); numIndexes++;
1332	*pIdx++ = _index( i + step, j + step ); numIndexes++;
1333	*pIdx++ = _index( i + step, j ); numIndexes++;
1334	}
1335	}
1336
1337	// North stitching
1338	if ( north > 0 )
1339	{
1340	/* msz: added for v1-2-0 compatibility */
1341	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1342	numIndexes += stitchEdge(NORTH, getRenderLevel(), mNeighbors[NORTH]->getRenderLevel(),
1343	west > 0, east > 0, &pIdx);
1344	#else
1345	numIndexes += stitchEdge(NORTH, mRenderLevel, mNeighbors[NORTH]->mRenderLevel,
1346	west > 0, east > 0, &pIdx);
1347	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1348	}
1349	// East stitching
1350	if ( east > 0 )
1351	{
1352	/* msz: added for v1-2-0 compatibility */
1353	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1354	numIndexes += stitchEdge(EAST, getRenderLevel(), mNeighbors[EAST]->getRenderLevel(),
1355	north > 0, south > 0, &pIdx);
1356	#else
1357	numIndexes += stitchEdge(EAST, mRenderLevel, mNeighbors[EAST]->mRenderLevel,
1358	north > 0, south > 0, &pIdx);
1359	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1360	}
1361	// South stitching
1362	if ( south > 0 )
1363	{
1364	/* msz: added for v1-2-0 compatibility */
1365	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1366	numIndexes += stitchEdge(SOUTH, getRenderLevel(), mNeighbors[SOUTH]->getRenderLevel(),
1367	east > 0, west > 0, &pIdx);
1368	#else
1369	numIndexes += stitchEdge(SOUTH, mRenderLevel, mNeighbors[SOUTH]->mRenderLevel,
1370	east > 0, west > 0, &pIdx);
1371	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1372	}
1373	// West stitching
1374	if ( west > 0 )
1375	{
1376	/* msz: added for v1-2-0 compatibility */
1377	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1378	numIndexes += stitchEdge(WEST, getRenderLevel(), mNeighbors[WEST]->getRenderLevel(),
1379	south > 0, north > 0, &pIdx);
1380	#else
1381	numIndexes += stitchEdge(WEST, mRenderLevel, mNeighbors[WEST]->mRenderLevel,
1382	south > 0, north > 0, &pIdx);
1383	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1384	}
1385
1386
1387	indexData->indexBuffer->unlock();
1388	indexData->indexCount = numIndexes;
1389	indexData->indexStart = 0;
1390
1391	return indexData;
1392	}
1393	//-----------------------------------------------------------------------
1394	HardwareVertexBufferSharedPtr BiTerrainRenderable::createDeltaBuffer(void)
1395	{
1396	// Delta buffer is a 1D float buffer of height offsets
1397	HardwareVertexBufferSharedPtr buf =
1398	HardwareBufferManager::getSingleton().createVertexBuffer(
1399	VertexElement::getTypeSize(VET_FLOAT1),
1400	mOptions->tileSize * mOptions->tileSize,
1401	HardwareBuffer::HBU_STATIC_WRITE_ONLY);
1402	// Fill the buffer with zeros, we will only fill in delta
1403	void* pVoid = buf->lock(HardwareBuffer::HBL_DISCARD);
1404	memset(pVoid, 0, mOptions->tileSize * mOptions->tileSize * sizeof(float));
1405	buf->unlock();
1406
1407	return buf;
1408
1409	}
1410	//-----------------------------------------------------------------------
1411	void BiTerrainRenderable::_updateCustomGpuParameter(
1412	const GpuProgramParameters::AutoConstantEntry& constantEntry,
1413	GpuProgramParameters* params) const
1414	{
1415	if (constantEntry.data == MORPH_CUSTOM_PARAM_ID)
1416	{
1417	// Update morph LOD factor
1418	params->setConstant(constantEntry.index, mLODMorphFactor);
1419	}
1420	else
1421	{
1422	Renderable::_updateCustomGpuParameter(constantEntry, params);
1423	}
1424
1425	}
1426	//-----------------------------------------------------------------------
1427	int BiTerrainRenderable::stitchEdge(Neighbor neighbor, int hiLOD, int loLOD,
1428	bool omitFirstTri, bool omitLastTri, unsigned short** ppIdx)
1429	{
1430	assert(loLOD > hiLOD);
1431	/*
1432	Now do the stitching; we can stitch from any level to any level.
1433	The stitch pattern is like this for each pair of vertices in the lower LOD
1434	(excuse the poor ascii art):
1435
1436	lower LOD
1437	-----------
1438	\|\ \ 3 / /\|
1439	\|1\2 \ / 4/5\|
1440	--------*
1441	higher LOD
1442
1443	The algorithm is, for each pair of lower LOD vertices:
1444	1. Iterate over the higher LOD vertices, generating tris connected to the
1445	first lower LOD vertex, up to and including 1/2 the span of the lower LOD
1446	over the higher LOD (tris 1-2). Skip the first tri if it is on the edge
1447	of the tile and that edge is to be stitched itself.
1448	2. Generate a single tri for the middle using the 2 lower LOD vertices and
1449	the middle vertex of the higher LOD (tri 3).
1450	3. Iterate over the higher LOD vertices from 1/2 the span of the lower LOD
1451	to the end, generating tris connected to the second lower LOD vertex
1452	(tris 4-5). Skip the last tri if it is on the edge of a tile and that
1453	edge is to be stitched itself.
1454
1455	The same algorithm works for all edges of the patch; stitching is done
1456	clockwise so that the origin and steps used change, but the general
1457	approach does not.
1458	*/
1459
1460	// Get pointer to be updated
1461	unsigned short* pIdx = *ppIdx;
1462
1463	// Work out the steps ie how to increment indexes
1464	// Step from one vertex to another in the high detail version
1465	int step = 1 << hiLOD;
1466	// Step from one vertex to another in the low detail version
1467	int superstep = 1 << loLOD;
1468	// Step half way between low detail steps
1469	int halfsuperstep = superstep >> 1;
1470
1471	// Work out the starting points and sign of increments
1472	// We always work the strip clockwise
1473	int startx, starty, endx, rowstep;
1474	bool horizontal;
1475	switch(neighbor)
1476	{
1477	case NORTH:
1478	startx = starty = 0;
1479	endx = mOptions->tileSize - 1;
1480	rowstep = step;
1481	horizontal = true;
1482	break;
1483	case SOUTH:
1484	// invert x AND y direction, helps to keep same winding
1485	startx = starty = mOptions->tileSize - 1;
1486	endx = 0;
1487	rowstep = -step;
1488	step = -step;
1489	superstep = -superstep;
1490	halfsuperstep = -halfsuperstep;
1491	horizontal = true;
1492	break;
1493	case EAST:
1494	startx = 0;
1495	endx = mOptions->tileSize - 1;
1496	starty = mOptions->tileSize - 1;
1497	rowstep = -step;
1498	horizontal = false;
1499	break;
1500	case WEST:
1501	startx = mOptions->tileSize - 1;
1502	endx = 0;
1503	starty = 0;
1504	rowstep = step;
1505	step = -step;
1506	superstep = -superstep;
1507	halfsuperstep = -halfsuperstep;
1508	horizontal = false;
1509	break;
1510	};
1511
1512	int numIndexes = 0;
1513
1514	for ( int j = startx; j != endx; j += superstep )
1515	{
1516	int k;
1517	for (k = 0; k != halfsuperstep; k += step)
1518	{
1519	int jk = j + k;
1520	//skip the first bit of the corner?
1521	if ( j != startx \|\| k != 0 \|\| !omitFirstTri )
1522	{
1523	if (horizontal)
1524	{
1525	*pIdx++ = _index( j , starty ); numIndexes++;
1526	*pIdx++ = _index( jk, starty + rowstep ); numIndexes++;
1527	*pIdx++ = _index( jk + step, starty + rowstep ); numIndexes++;
1528	}
1529	else
1530	{
1531	*pIdx++ = _index( starty, j ); numIndexes++;
1532	*pIdx++ = _index( starty + rowstep, jk ); numIndexes++;
1533	*pIdx++ = _index( starty + rowstep, jk + step); numIndexes++;
1534	}
1535	}
1536	}
1537
1538	// Middle tri
1539	if (horizontal)
1540	{
1541	*pIdx++ = _index( j, starty ); numIndexes++;
1542	*pIdx++ = _index( j + halfsuperstep, starty + rowstep); numIndexes++;
1543	*pIdx++ = _index( j + superstep, starty ); numIndexes++;
1544	}
1545	else
1546	{
1547	*pIdx++ = _index( starty, j ); numIndexes++;
1548	*pIdx++ = _index( starty + rowstep, j + halfsuperstep ); numIndexes++;
1549	*pIdx++ = _index( starty, j + superstep ); numIndexes++;
1550	}
1551
1552	for (k = halfsuperstep; k != superstep; k += step)
1553	{
1554	int jk = j + k;
1555	if ( j != endx - superstep \|\| k != superstep - step \|\| !omitLastTri )
1556	{
1557	if (horizontal)
1558	{
1559	*pIdx++ = _index( j + superstep, starty ); numIndexes++;
1560	*pIdx++ = _index( jk, starty + rowstep ); numIndexes++;
1561	*pIdx++ = _index( jk + step, starty + rowstep ); numIndexes++;
1562	}
1563	else
1564	{
1565	*pIdx++ = _index( starty, j + superstep ); numIndexes++;
1566	*pIdx++ = _index( starty + rowstep, jk ); numIndexes++;
1567	*pIdx++ = _index( starty + rowstep, jk + step ); numIndexes++;
1568	}
1569	}
1570	}
1571	}
1572
1573	*ppIdx = pIdx;
1574
1575	return numIndexes;
1576
1577	}
1578
1579	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
1580	//-----------------------------------------------------------------------
1581	void BiTerrainRenderable::ResetRenderLevelIndex()
1582	{
1583	msCurrentRenderLevelIndex = 0;
1584	}
1585	//-----------------------------------------------------------------------
1586	void BiTerrainRenderable::NextRenderLevelIndex()
1587	{
1588	if ((++ msCurrentRenderLevelIndex) > MAX_RENDERLEVEL_INDEX)
1589	msCurrentRenderLevelIndex = 0;
1590	}
1591	#endif // GTP_VISIBILITY_MODIFIED_OGRE
1592
1593	} //namespace

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source: GTP/trunk/Lib/Vis/OnlineCullingCHC/OGRE/src/OgreBiTerrainRenderable.cpp @ 2348

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