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source: trunk/VUT/work/ogre_changes/OgreMain/src/OgreFrustum.cpp @ 61

Revision 61, 31.8 KB checked in by mattausch, 19 years ago (diff)

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1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://ogre.sourceforge.net/
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	#include "OgreStableHeaders.h"
26	#include "OgreFrustum.h"
27
28	#include "OgreMath.h"
29	#include "OgreMatrix3.h"
30	#include "OgreSceneNode.h"
31	#include "OgreSphere.h"
32	#include "OgreLogManager.h"
33	#include "OgreException.h"
34	#include "OgreRoot.h"
35	#include "OgreCamera.h"
36	#include "OgreHardwareBufferManager.h"
37	#include "OgreHardwareVertexBuffer.h"
38	#include "OgreHardwareIndexBuffer.h"
39	#include "OgreMaterialManager.h"
40	#include "OgreRenderSystem.h"
41
42	namespace Ogre {
43
44	String Frustum::msMovableType = "Frustum";
45	const Real Frustum::INFINITE_FAR_PLANE_ADJUST = 0.00001;
46	//-----------------------------------------------------------------------
47	Frustum::Frustum() :
48	mProjType(PT_PERSPECTIVE),
49	mFOVy(Radian(Math::PI/4.0)),
50	mFarDist(100000.0f),
51	mNearDist(100.0f),
52	mAspect(1.33333333333333f),
53	mProjMatrix(Matrix4::ZERO),
54	mViewMatrix(Matrix4::ZERO),
55	mRecalcFrustum(true),
56	mRecalcView(true),
57	mReflect(false),
58	mReflectMatrix(Matrix4::ZERO),
59	mLinkedReflectPlane(0),
60	mObliqueDepthProjection(false),
61	mLinkedObliqueProjPlane(0)
62	{
63	// Initialise vertex & index data
64	mVertexData.vertexDeclaration->addElement(0, 0, VET_FLOAT3, VES_POSITION);
65	mVertexData.vertexCount = 32;
66	mVertexData.vertexStart = 0;
67	mVertexData.vertexBufferBinding->setBinding( 0,
68	HardwareBufferManager::getSingleton().createVertexBuffer(
69	sizeof(float)*3, 32, HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY) );
70
71	// Initialise material
72	mMaterial = MaterialManager::getSingleton().getByName("BaseWhiteNoLighting");
73
74	// Alter superclass members
75	mVisible = false;
76	mParentNode = 0;
77
78	mLastLinkedReflectionPlane.normal = Vector3::ZERO;
79	mLastLinkedObliqueProjPlane.normal = Vector3::ZERO;
80
81
82	updateView();
83	}
84
85	//-----------------------------------------------------------------------
86	Frustum::~Frustum()
87	{
88	// Do nothing
89	}
90
91	//-----------------------------------------------------------------------
92	void Frustum::setFOVy(const Radian& fov)
93	{
94	mFOVy = fov;
95	invalidateFrustum();
96	}
97
98	//-----------------------------------------------------------------------
99	const Radian& Frustum::getFOVy(void) const
100	{
101	return mFOVy;
102	}
103
104
105	//-----------------------------------------------------------------------
106	void Frustum::setFarClipDistance(Real farPlane)
107	{
108	mFarDist = farPlane;
109	invalidateFrustum();
110	}
111
112	//-----------------------------------------------------------------------
113	Real Frustum::getFarClipDistance(void) const
114	{
115	return mFarDist;
116	}
117
118	//-----------------------------------------------------------------------
119	void Frustum::setNearClipDistance(Real nearPlane)
120	{
121	if (nearPlane <= 0)
122	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Near clip distance must be greater than zero.",
123	"Frustum::setNearClipDistance");
124	mNearDist = nearPlane;
125	invalidateFrustum();
126	}
127
128	//-----------------------------------------------------------------------
129	Real Frustum::getNearClipDistance(void) const
130	{
131	return mNearDist;
132	}
133
134	//-----------------------------------------------------------------------
135	const Matrix4& Frustum::getProjectionMatrix(void) const
136	{
137
138	updateFrustum();
139
140	return mProjMatrix;
141	}
142	//-----------------------------------------------------------------------
143	const Matrix4& Frustum::getStandardProjectionMatrix(void) const
144	{
145
146	updateFrustum();
147
148	return mStandardProjMatrix;
149	}
150	//-----------------------------------------------------------------------
151	const Matrix4& Frustum::getViewMatrix(void) const
152	{
153	updateView();
154
155	return mViewMatrix;
156
157	}
158
159	//-----------------------------------------------------------------------
160	const Plane& Frustum::getFrustumPlane(unsigned short plane) const
161	{
162	// Make any pending updates to the calculated frustum
163	updateView();
164
165	return mFrustumPlanes[plane];
166
167	}
168
169	//-----------------------------------------------------------------------
170	bool Frustum::isVisible(const AxisAlignedBox& bound, FrustumPlane* culledBy) const
171	{
172	// Null boxes always invisible
173	if (bound.isNull()) return false;
174
175	// Make any pending updates to the calculated frustum
176	updateView();
177
178	// Get corners of the box
179	const Vector3* pCorners = bound.getAllCorners();
180
181
182	// For each plane, see if all points are on the negative side
183	// If so, object is not visible
184	for (int plane = 0; plane < 6; ++plane)
185	{
186	// Skip far plane if infinite view frustum
187	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
188	continue;
189
190	if (mFrustumPlanes[plane].getSide(pCorners[0]) == Plane::NEGATIVE_SIDE &&
191	mFrustumPlanes[plane].getSide(pCorners[1]) == Plane::NEGATIVE_SIDE &&
192	mFrustumPlanes[plane].getSide(pCorners[2]) == Plane::NEGATIVE_SIDE &&
193	mFrustumPlanes[plane].getSide(pCorners[3]) == Plane::NEGATIVE_SIDE &&
194	mFrustumPlanes[plane].getSide(pCorners[4]) == Plane::NEGATIVE_SIDE &&
195	mFrustumPlanes[plane].getSide(pCorners[5]) == Plane::NEGATIVE_SIDE &&
196	mFrustumPlanes[plane].getSide(pCorners[6]) == Plane::NEGATIVE_SIDE &&
197	mFrustumPlanes[plane].getSide(pCorners[7]) == Plane::NEGATIVE_SIDE)
198	{
199	// ALL corners on negative side therefore out of view
200	if (culledBy)
201	*culledBy = (FrustumPlane)plane;
202	return false;
203	}
204
205	}
206
207	return true;
208	}
209
210	//-----------------------------------------------------------------------
211	bool Frustum::isVisible(const Vector3& vert, FrustumPlane* culledBy) const
212	{
213	// Make any pending updates to the calculated frustum
214	updateView();
215
216	// For each plane, see if all points are on the negative side
217	// If so, object is not visible
218	for (int plane = 0; plane < 6; ++plane)
219	{
220	// Skip far plane if infinite view frustum
221	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
222	continue;
223
224	if (mFrustumPlanes[plane].getSide(vert) == Plane::NEGATIVE_SIDE)
225	{
226	// ALL corners on negative side therefore out of view
227	if (culledBy)
228	*culledBy = (FrustumPlane)plane;
229	return false;
230	}
231
232	}
233
234	return true;
235	}
236
237	//-----------------------------------------------------------------------
238	bool Frustum::isVisible(const Sphere& sphere, FrustumPlane* culledBy) const
239	{
240	// Make any pending updates to the calculated frustum
241	updateView();
242
243	// For each plane, see if sphere is on negative side
244	// If so, object is not visible
245	for (int plane = 0; plane < 6; ++plane)
246	{
247	// Skip far plane if infinite view frustum
248	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
249	continue;
250
251	// If the distance from sphere center to plane is negative, and 'more negative'
252	// than the radius of the sphere, sphere is outside frustum
253	if (mFrustumPlanes[plane].getDistance(sphere.getCenter()) < -sphere.getRadius())
254	{
255	// ALL corners on negative side therefore out of view
256	if (culledBy)
257	*culledBy = (FrustumPlane)plane;
258	return false;
259	}
260
261	}
262
263	return true;
264	}
265	//-----------------------------------------------------------------------
266	void Frustum::updateFrustum(void) const
267	{
268	if (isFrustumOutOfDate())
269	{
270	// Common calcs
271	Radian thetaY (mFOVy * 0.5f);
272	Real tanThetaY = Math::Tan(thetaY);
273	Real tanThetaX = tanThetaY * mAspect;
274	Real vpTop = tanThetaY * mNearDist;
275	Real vpRight = tanThetaX * mNearDist;
276	Real vpBottom = -vpTop;
277	Real vpLeft = -vpRight;
278
279	RenderSystem* renderSystem = Root::getSingleton().getRenderSystem();
280	// Recalc if frustum params changed
281	if (mProjType == PT_PERSPECTIVE)
282	{
283
284	// PERSPECTIVE transform, API specific
285	renderSystem->_makeProjectionMatrix(mFOVy,
286	mAspect, mNearDist, mFarDist, mProjMatrix);
287
288	// PERSPECTIVE transform, API specific for Gpu Programs
289	renderSystem->_makeProjectionMatrix(mFOVy,
290	mAspect, mNearDist, mFarDist, mStandardProjMatrix, true);
291
292	if (mObliqueDepthProjection)
293	{
294	// Translate the plane into view space
295	Plane viewSpaceNear = mViewMatrix * mObliqueProjPlane;
296	renderSystem->_applyObliqueDepthProjection(
297	mProjMatrix, viewSpaceNear, false);
298	renderSystem->_applyObliqueDepthProjection(
299	mStandardProjMatrix, viewSpaceNear, true);
300	}
301	}
302	else if (mProjType == PT_ORTHOGRAPHIC)
303	{
304	// ORTHOGRAPHIC projection, API specific
305	Root::getSingleton().getRenderSystem()->_makeOrthoMatrix(mFOVy,
306	mAspect, mNearDist, mFarDist, mProjMatrix);
307
308	// ORTHOGRAPHIC projection, non-API specific
309	Root::getSingleton().getRenderSystem()->_makeOrthoMatrix(mFOVy,
310	mAspect, mNearDist, mFarDist, mStandardProjMatrix, true);
311
312
313	}
314
315
316	// Calculate bounding box (local)
317	// Box is from 0, down -Z, max dimensions as determined from far plane
318	// If infinite view frustum just pick a far value
319	Real farDist = (mFarDist == 0) ? 100000 : mFarDist;
320	Real farTop = tanThetaY * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
321	Real farRight = tanThetaX * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
322	Real farBottom = -farTop;
323	Real farLeft = -farRight;
324	Vector3 min(-farRight, -farTop, 0);
325	Vector3 max(farRight, farTop, -farDist);
326	mBoundingBox.setExtents(min, max);
327
328	// Calculate vertex positions (local)
329	// 0 is the origin
330	// 1, 2, 3, 4 are the points on the near plane, top left first, clockwise
331	// 5, 6, 7, 8 are the points on the far plane, top left first, clockwise
332	HardwareVertexBufferSharedPtr vbuf = mVertexData.vertexBufferBinding->getBuffer(0);
333	float* pFloat = static_cast<float*>(vbuf->lock(HardwareBuffer::HBL_DISCARD));
334
335	// near plane (remember frustum is going in -Z direction)
336	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
337	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
338
339	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
340	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
341
342	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
343	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
344
345	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
346	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
347
348	// far plane (remember frustum is going in -Z direction)
349	pFloat++ = farLeft; pFloat++ = farTop; *pFloat++ = -farDist;
350	pFloat++ = farRight; pFloat++ = farTop; *pFloat++ = -farDist;
351
352	pFloat++ = farRight; pFloat++ = farTop; *pFloat++ = -farDist;
353	pFloat++ = farRight; pFloat++ = farBottom; *pFloat++ = -farDist;
354
355	pFloat++ = farRight; pFloat++ = farBottom; *pFloat++ = -farDist;
356	pFloat++ = farLeft; pFloat++ = farBottom; *pFloat++ = -farDist;
357
358	pFloat++ = farLeft; pFloat++ = farBottom; *pFloat++ = -farDist;
359	pFloat++ = farLeft; pFloat++ = farTop; *pFloat++ = -farDist;
360
361	// Sides of the pyramid
362	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
363	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
364
365	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
366	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
367
368	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
369	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
370
371	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
372	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
373
374	// Sides of the box
375
376	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
377	pFloat++ = farLeft; pFloat++ = farTop; *pFloat++ = -farDist;
378
379	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
380	pFloat++ = farRight; pFloat++ = farTop; *pFloat++ = -farDist;
381
382	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
383	pFloat++ = farRight; pFloat++ = farBottom; *pFloat++ = -farDist;
384
385	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
386	pFloat++ = farLeft; pFloat++ = farBottom; *pFloat++ = -farDist;
387
388
389	vbuf->unlock();
390
391	mRecalcFrustum = false;
392	}
393	}
394
395	//-----------------------------------------------------------------------
396	bool Frustum::isViewOutOfDate(void) const
397	{
398	bool returnVal = false;
399	// Attached to node?
400	if (mParentNode)
401	{
402	if (!mRecalcView && mParentNode->_getDerivedOrientation() == mLastParentOrientation &&
403	mParentNode->_getDerivedPosition() == mLastParentPosition)
404	{
405	returnVal = false;
406	}
407	else
408	{
409	// Ok, we're out of date with SceneNode we're attached to
410	mLastParentOrientation = mParentNode->_getDerivedOrientation();
411	mLastParentPosition = mParentNode->_getDerivedPosition();
412	returnVal = true;
413	}
414	}
415	// Deriving reflection from linked plane?
416	if (mReflect && mLinkedReflectPlane &&
417	!(mLastLinkedReflectionPlane == mLinkedReflectPlane->_getDerivedPlane()))
418	{
419	mReflectPlane = mLinkedReflectPlane->_getDerivedPlane();
420	mReflectMatrix = Math::buildReflectionMatrix(mReflectPlane);
421	mLastLinkedReflectionPlane = mLinkedReflectPlane->_getDerivedPlane();
422	returnVal = true;
423	}
424
425	return mRecalcView \|\| returnVal;
426	}
427
428	//-----------------------------------------------------------------------
429	bool Frustum::isFrustumOutOfDate(void) const
430	{
431	// Deriving custom near plane from linked plane?
432	bool returnVal = false;
433	if (mObliqueDepthProjection)
434	{
435	// Always out of date since plane needs to be in view space
436	returnVal = true;
437	// Update derived plane
438	if (mLinkedObliqueProjPlane &&
439	!(mLastLinkedObliqueProjPlane == mLinkedObliqueProjPlane->_getDerivedPlane()))
440	{
441	mObliqueProjPlane = mLinkedObliqueProjPlane->_getDerivedPlane();
442	mLastLinkedObliqueProjPlane = mObliqueProjPlane;
443	}
444	}
445
446	return mRecalcFrustum \|\| returnVal;
447	}
448
449	//-----------------------------------------------------------------------
450	void Frustum::updateView(void) const
451	{
452	if (isViewOutOfDate())
453	{
454	// ----------------------
455	// Update the view matrix
456	// ----------------------
457
458	// View matrix is:
459	//
460	// [ Lx Uy Dz Tx ]
461	// [ Lx Uy Dz Ty ]
462	// [ Lx Uy Dz Tz ]
463	// [ 0 0 0 1 ]
464	//
465	// Where T = -(Transposed(Rot) * Pos)
466
467	// This is most efficiently done using 3x3 Matrices
468
469	// Get orientation from quaternion
470
471	Matrix3 rot;
472	const Quaternion& orientation = getOrientationForViewUpdate();
473	const Vector3& position = getPositionForViewUpdate();
474	orientation.ToRotationMatrix(rot);
475
476	// Make the translation relative to new axes
477	Matrix3 rotT = rot.Transpose();
478	Vector3 trans = -rotT * position;
479
480	// Make final matrix
481	mViewMatrix = Matrix4::IDENTITY;
482	mViewMatrix = rotT; // fills upper 3x3
483	mViewMatrix[0][3] = trans.x;
484	mViewMatrix[1][3] = trans.y;
485	mViewMatrix[2][3] = trans.z;
486
487	// Deal with reflections
488	if (mReflect)
489	{
490	mViewMatrix = mViewMatrix * mReflectMatrix;
491	}
492
493	// -------------------------
494	// Update the frustum planes
495	// -------------------------
496	updateFrustum();
497
498	Matrix4 combo = mStandardProjMatrix * mViewMatrix;
499	mFrustumPlanes[FRUSTUM_PLANE_LEFT].normal.x = combo[3][0] + combo[0][0];
500	mFrustumPlanes[FRUSTUM_PLANE_LEFT].normal.y = combo[3][1] + combo[0][1];
501	mFrustumPlanes[FRUSTUM_PLANE_LEFT].normal.z = combo[3][2] + combo[0][2];
502	mFrustumPlanes[FRUSTUM_PLANE_LEFT].d = combo[3][3] + combo[0][3];
503
504	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].normal.x = combo[3][0] - combo[0][0];
505	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].normal.y = combo[3][1] - combo[0][1];
506	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].normal.z = combo[3][2] - combo[0][2];
507	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].d = combo[3][3] - combo[0][3];
508
509	mFrustumPlanes[FRUSTUM_PLANE_TOP].normal.x = combo[3][0] - combo[1][0];
510	mFrustumPlanes[FRUSTUM_PLANE_TOP].normal.y = combo[3][1] - combo[1][1];
511	mFrustumPlanes[FRUSTUM_PLANE_TOP].normal.z = combo[3][2] - combo[1][2];
512	mFrustumPlanes[FRUSTUM_PLANE_TOP].d = combo[3][3] - combo[1][3];
513
514	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].normal.x = combo[3][0] + combo[1][0];
515	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].normal.y = combo[3][1] + combo[1][1];
516	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].normal.z = combo[3][2] + combo[1][2];
517	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].d = combo[3][3] + combo[1][3];
518
519	mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.x = combo[3][0] + combo[2][0];
520	mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.y = combo[3][1] + combo[2][1];
521	mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.z = combo[3][2] + combo[2][2];
522	mFrustumPlanes[FRUSTUM_PLANE_NEAR].d = combo[3][3] + combo[2][3];
523
524	mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.x = combo[3][0] - combo[2][0];
525	mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.y = combo[3][1] - combo[2][1];
526	mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.z = combo[3][2] - combo[2][2];
527	mFrustumPlanes[FRUSTUM_PLANE_FAR].d = combo[3][3] - combo[2][3];
528
529	// Renormalise any normals which were not unit length
530	for(int i=0; i<6; i++ )
531	{
532	float length = mFrustumPlanes[i].normal.normalise();
533	mFrustumPlanes[i].d /= length;
534	}
535
536	// Update worldspace corners
537	Matrix4 eyeToWorld = mViewMatrix.inverse();
538	// Get worldspace frustum corners
539	// Treat infinite fardist as some arbitrary far value
540	Real farDist = (mFarDist == 0)? 100000 : mFarDist;
541	Real y = Math::Tan(mFOVy * 0.5);
542	Real x = mAspect * y;
543	Real neary = y * mNearDist;
544	Real fary = y * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
545	Real nearx = x * mNearDist;
546	Real farx = x * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
547	// near
548	mWorldSpaceCorners[0] = eyeToWorld * Vector3( nearx, neary, -mNearDist);
549	mWorldSpaceCorners[1] = eyeToWorld * Vector3(-nearx, neary, -mNearDist);
550	mWorldSpaceCorners[2] = eyeToWorld * Vector3(-nearx, -neary, -mNearDist);
551	mWorldSpaceCorners[3] = eyeToWorld * Vector3( nearx, -neary, -mNearDist);
552	// far
553	mWorldSpaceCorners[4] = eyeToWorld * Vector3( farx, fary, -farDist);
554	mWorldSpaceCorners[5] = eyeToWorld * Vector3(-farx, fary, -farDist);
555	mWorldSpaceCorners[6] = eyeToWorld * Vector3(-farx, -fary, -farDist);
556	mWorldSpaceCorners[7] = eyeToWorld * Vector3( farx, -fary, -farDist);
557
558
559	mRecalcView = false;
560
561	}
562
563	}
564
565	//-----------------------------------------------------------------------
566	Real Frustum::getAspectRatio(void) const
567	{
568	return mAspect;
569	}
570
571	//-----------------------------------------------------------------------
572	void Frustum::setAspectRatio(Real r)
573	{
574	mAspect = r;
575	invalidateFrustum();
576	}
577
578	//-----------------------------------------------------------------------
579	const AxisAlignedBox& Frustum::getBoundingBox(void) const
580	{
581	return mBoundingBox;
582	}
583	//-----------------------------------------------------------------------
584	void Frustum::_updateRenderQueue(RenderQueue* queue)
585	{
586	// Add self
587	queue->addRenderable(this);
588	}
589	//-----------------------------------------------------------------------
590	const String& Frustum::getMovableType(void) const
591	{
592	return msMovableType;
593	}
594	//-----------------------------------------------------------------------
595	Real Frustum::getBoundingRadius(void) const
596	{
597	return (mFarDist == 0)? 100000 : mFarDist;
598	}
599	//-----------------------------------------------------------------------
600	const MaterialPtr& Frustum::getMaterial(void) const
601	{
602	return mMaterial;
603	}
604	//-----------------------------------------------------------------------
605	void Frustum::getRenderOperation(RenderOperation& op)
606	{
607	updateView();
608	updateFrustum();
609	op.operationType = RenderOperation::OT_LINE_LIST;
610	op.useIndexes = false;
611	op.vertexData = &mVertexData;
612	}
613	//-----------------------------------------------------------------------
614	void Frustum::getWorldTransforms(Matrix4* xform) const
615	{
616	if (mParentNode)
617	mParentNode->getWorldTransforms(xform);
618	}
619	//-----------------------------------------------------------------------
620	const Quaternion& Frustum::getWorldOrientation(void) const
621	{
622	if (mParentNode)
623	return mParentNode->_getDerivedOrientation();
624	else
625	return Quaternion::IDENTITY;
626	}
627	//-----------------------------------------------------------------------
628	const Vector3& Frustum::getWorldPosition(void) const
629	{
630	if (mParentNode)
631	return mParentNode->_getDerivedPosition();
632	else
633	return Vector3::ZERO;
634	}
635	//-----------------------------------------------------------------------
636	Real Frustum::getSquaredViewDepth(const Camera* cam) const
637	{
638	// Calc from centre
639	if (mParentNode)
640	return (cam->getDerivedPosition()
641	- mParentNode->_getDerivedPosition()).squaredLength();
642	else
643	return 0;
644	}
645	//-----------------------------------------------------------------------
646	const LightList& Frustum::getLights(void) const
647	{
648	// N/A
649	static LightList ll;
650	return ll;
651	}
652	//-----------------------------------------------------------------------
653	const String& Frustum::getName(void) const
654	{
655	// NA
656	return msMovableType;
657	}
658	//-----------------------------------------------------------------------
659	void Frustum::_notifyCurrentCamera(Camera* cam)
660	{
661	// NA
662	}
663
664	// -------------------------------------------------------------------
665	void Frustum::invalidateFrustum() const
666	{
667	mRecalcFrustum = true;
668	}
669	// -------------------------------------------------------------------
670	void Frustum::invalidateView() const
671	{
672	mRecalcView = true;
673	}
674	// -------------------------------------------------------------------
675	const Vector3* Frustum::getWorldSpaceCorners(void) const
676	{
677	updateView();
678
679	return mWorldSpaceCorners;
680	}
681	//-----------------------------------------------------------------------
682	void Frustum::setProjectionType(ProjectionType pt)
683	{
684	mProjType = pt;
685	invalidateFrustum();
686	}
687
688	//-----------------------------------------------------------------------
689	ProjectionType Frustum::getProjectionType(void) const
690	{
691	return mProjType;
692	}
693	//-----------------------------------------------------------------------
694	const Vector3& Frustum::getPositionForViewUpdate(void) const
695	{
696	return mLastParentPosition;
697	}
698	//-----------------------------------------------------------------------
699	const Quaternion& Frustum::getOrientationForViewUpdate(void) const
700	{
701	return mLastParentOrientation;
702	}
703	//-----------------------------------------------------------------------
704	void Frustum::enableReflection(const Plane& p)
705	{
706	mReflect = true;
707	mReflectPlane = p;
708	mLinkedReflectPlane = 0;
709	mReflectMatrix = Math::buildReflectionMatrix(p);
710	invalidateView();
711
712	}
713	//-----------------------------------------------------------------------
714	void Frustum::enableReflection(const MovablePlane* p)
715	{
716	mReflect = true;
717	mLinkedReflectPlane = p;
718	mReflectPlane = mLinkedReflectPlane->_getDerivedPlane();
719	mReflectMatrix = Math::buildReflectionMatrix(mReflectPlane);
720	mLastLinkedReflectionPlane = mLinkedReflectPlane->_getDerivedPlane();
721	invalidateView();
722	}
723	//-----------------------------------------------------------------------
724	void Frustum::disableReflection(void)
725	{
726	mReflect = false;
727	mLastLinkedReflectionPlane.normal = Vector3::ZERO;
728	invalidateView();
729	}
730	//---------------------------------------------------------------------
731	bool Frustum::projectSphere(const Sphere& sphere,
732	Real* left, Real* top, Real* right, Real* bottom) const
733	{
734	// initialise
735	left = bottom = -1.0f;
736	right = top = 1.0f;
737
738	// Transform light position into camera space
739	Vector3 eyeSpacePos = getViewMatrix() * sphere.getCenter();
740
741	if (eyeSpacePos.z < 0)
742	{
743	Real r = sphere.getRadius();
744	// early-exit
745	if (eyeSpacePos.squaredLength() <= r * r)
746	return false;
747
748	Vector3 screenSpacePos = getStandardProjectionMatrix() * eyeSpacePos;
749
750
751	// perspective attenuate
752	Vector3 spheresize(r, r, eyeSpacePos.z);
753	spheresize = getStandardProjectionMatrix() * spheresize;
754
755	Real possLeft = screenSpacePos.x - spheresize.x;
756	Real possRight = screenSpacePos.x + spheresize.x;
757	Real possTop = screenSpacePos.y + spheresize.y;
758	Real possBottom = screenSpacePos.y - spheresize.y;
759
760	*left = std::max(static_cast<Real>(-1.0), possLeft);
761	*right = std::min(static_cast<Real>(1.0), possRight);
762	*top = std::min(static_cast<Real>(1.0), possTop);
763	*bottom = std::max(static_cast<Real>(-1.0), possBottom);
764
765	}
766
767	return (left != -1.0f) \|\| (top != 1.0f) \|\| (right != 1.0f) \|\| (bottom != -1.0f);
768
769	}
770	//---------------------------------------------------------------------
771	void Frustum::enableCustomNearClipPlane(const MovablePlane* plane)
772	{
773	mObliqueDepthProjection = true;
774	mLinkedObliqueProjPlane = plane;
775	mObliqueProjPlane = plane->_getDerivedPlane();
776	invalidateFrustum();
777	}
778	//---------------------------------------------------------------------
779	void Frustum::enableCustomNearClipPlane(const Plane& plane)
780	{
781	mObliqueDepthProjection = true;
782	mLinkedObliqueProjPlane = 0;
783	mObliqueProjPlane = plane;
784	invalidateFrustum();
785	}
786	//---------------------------------------------------------------------
787	void Frustum::disableCustomNearClipPlane(void)
788	{
789	mObliqueDepthProjection = false;
790	mLinkedObliqueProjPlane = 0;
791	invalidateFrustum();
792	}
793	//---------------------------------------------------------------------
794
795	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
796	//-----------------------------------------------------------------------
797	//added by matt: 050405
798	bool Frustum::isVisible(const AxisAlignedBox& bound, bool &intersects, FrustumPlane* culledBy) const
799	{
800	intersects = false;
801
802	// Null boxes always invisible
803	if (bound.isNull()) return false;
804
805	// Make any pending updates to the calculated frustum
806	updateView();
807
808	// Get corners of the box
809	const Vector3* pCorners = bound.getAllCorners();
810
811	// For each plane, see if all points are on the negative side
812	// If so, object is not visible
813	for (int plane = 0; plane < 6; ++plane)
814	{
815	// Skip far plane if infinite view frustum
816	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
817	continue;
818
819	int corner = 0;
820	bool visible = false;
821
822	while((corner < 8) && (!visible \|\| ((plane == FRUSTUM_PLANE_NEAR) && !intersects)))
823	{
824	if(mFrustumPlanes[plane].getSide(pCorners[corner++]) == Plane::NEGATIVE_SIDE)
825	{
826	if(plane == FRUSTUM_PLANE_NEAR)
827	intersects = true;
828	}
829	else
830	{
831	visible = true;
832	}
833	}
834
835	if(!visible)
836	{
837	// ALL corners on negative side therefore out of view
838	if (culledBy)
839	*culledBy = (FrustumPlane)plane;
840	return false;
841	}
842	}
843
844	return true;
845	}
846	#endif // GTP_VISIBILITY_MODIFIED_OGRE
847	} // namespace Ogre

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