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source: OGRE/trunk/ogrenew/Samples/Grass/src/Grass.cpp @ 657

Revision 657, 13.5 KB checked in by mattausch, 19 years ago (diff)
added ogre dependencies and patched ogre sources

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	You may use this sample code for anything you like, it is not covered by the
11	LGPL like the rest of the engine.
12	-----------------------------------------------------------------------------
13	*/
14
15	/**
16	\file
17	Grass.cpp
18	\brief
19	Specialisation of OGRE's framework application to show the
20	use of the StaticGeometry class to create 'baked' instances of
21	many meshes, to create effects like grass efficiently.
22	**/
23
24	#include "ExampleApplication.h"
25
26	#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
27	#define WIN32_LEAN_AND_MEAN
28	#include "windows.h"
29	#endif
30
31
32	#define KEY_PRESSED(_key,_timeDelay, _macro) \
33	{ \
34	if (mInputDevice->isKeyDown(_key) && timeDelay <= 0) \
35	{ \
36	timeDelay = _timeDelay; \
37	_macro ; \
38	} \
39	}
40
41	#define GRASS_HEIGHT 300
42	#define GRASS_WIDTH 250
43	#define GRASS_MESH_NAME "grassblades"
44	#define GRASS_MATERIAL "Examples/GrassBlades"
45	#define OFFSET_PARAM 999
46
47	Light* mLight;
48	SceneNode* mLightNode = 0;
49	AnimationState* mAnimState = 0;
50	ColourValue mMinLightColour(0.5, 0.1, 0.0);
51	ColourValue mMaxLightColour(1.0, 0.6, 0.0);
52	Real mMinFlareSize = 40;
53	Real mMaxFlareSize = 80;
54	StaticGeometry* mStaticGeom;
55
56
57	/** This class 'wibbles' the light and billboard */
58	class LightWibbler : public ControllerValue<Real>
59	{
60	protected:
61	Light* mLight;
62	Billboard* mBillboard;
63	ColourValue mColourRange;
64	ColourValue mHalfColour;
65	Real mMinSize;
66	Real mSizeRange;
67	Real intensity;
68	public:
69	LightWibbler(Light* light, Billboard* billboard, const ColourValue& minColour,
70	const ColourValue& maxColour, Real minSize, Real maxSize)
71	{
72	mLight = light;
73	mBillboard = billboard;
74	mColourRange.r = (maxColour.r - minColour.r) * 0.5;
75	mColourRange.g = (maxColour.g - minColour.g) * 0.5;
76	mColourRange.b = (maxColour.b - minColour.b) * 0.5;
77	mHalfColour = minColour + mColourRange;
78	mMinSize = minSize;
79	mSizeRange = maxSize - minSize;
80	}
81
82	virtual Real getValue (void) const
83	{
84	return intensity;
85	}
86
87	virtual void setValue (Real value)
88	{
89	intensity = value;
90
91	ColourValue newColour;
92
93	// Attenuate the brightness of the light
94	newColour.r = mHalfColour.r + (mColourRange.r * intensity);
95	newColour.g = mHalfColour.g + (mColourRange.g * intensity);
96	newColour.b = mHalfColour.b + (mColourRange.b * intensity);
97
98	mLight->setDiffuseColour(newColour);
99	mBillboard->setColour(newColour);
100	// set billboard size
101	Real newSize = mMinSize + (intensity * mSizeRange);
102	mBillboard->setDimensions(newSize, newSize);
103
104	}
105	};
106
107	class GrassListener : public ExampleFrameListener
108	{
109	protected:
110	SceneManager* mSceneManager;
111	bool mShowBBs;
112	public:
113	GrassListener(RenderWindow* win, Camera* cam, SceneManager* sceneManager)
114	: ExampleFrameListener(win, cam),
115	mSceneManager(sceneManager), mShowBBs(false)
116	{
117	}
118
119
120	void waveGrass(Real timeElapsed)
121	{
122	static Real xinc = Math::PI * 0.4;
123	static Real zinc = Math::PI * 0.55;
124	static Real xpos = Math::RangeRandom(-Math::PI, Math::PI);
125	static Real zpos = Math::RangeRandom(-Math::PI, Math::PI);
126
127	xpos += xinc * timeElapsed;
128	zpos += zinc * timeElapsed;
129
130	// Update vertex program parameters by binding a value to each renderable
131	static Vector4 offset(0,0,0,0);
132
133	StaticGeometry::RegionIterator rit = mStaticGeom->getRegionIterator();
134	while (rit.hasMoreElements())
135	{
136	StaticGeometry::Region* reg = rit.getNext();
137
138	// a little randomness
139	xpos += reg->getCentre().x * 0.001;
140	zpos += reg->getCentre().z * 0.001;
141	offset.x = Math::Sin(xpos) * 0.05;
142	offset.z = Math::Sin(zpos) * 0.05;
143
144	StaticGeometry::Region::LODIterator lodit = reg->getLODIterator();
145	while (lodit.hasMoreElements())
146	{
147	StaticGeometry::LODBucket* lod = lodit.getNext();
148	StaticGeometry::LODBucket::MaterialIterator matit =
149	lod->getMaterialIterator();
150	while (matit.hasMoreElements())
151	{
152	StaticGeometry::MaterialBucket* mat = matit.getNext();
153	StaticGeometry::MaterialBucket::GeometryIterator geomit =
154	mat->getGeometryIterator();
155	while (geomit.hasMoreElements())
156	{
157	StaticGeometry::GeometryBucket* geom = geomit.getNext();
158	geom->setCustomParameter(OFFSET_PARAM, offset);
159
160	}
161	}
162	}
163	}
164
165	}
166
167	bool frameStarted(const FrameEvent& evt)
168	{
169	bool ok = ExampleFrameListener::frameStarted(evt);
170
171	static Real timeDelay = 0;
172	timeDelay -= evt.timeSinceLastFrame;
173
174	if (mAnimState)
175	mAnimState->addTime(evt.timeSinceLastFrame);
176
177	KEY_PRESSED(KC_B, 1,
178	mShowBBs = !mShowBBs;
179	mSceneManager->showBoundingBoxes(mShowBBs);
180	)
181
182	waveGrass(evt.timeSinceLastFrame);
183
184	return ok;
185	}
186
187
188
189
190	};
191
192
193
194	class Grass_Application : public ExampleApplication
195	{
196	public:
197	Grass_Application() {}
198
199	protected:
200	SceneNode *mpObjsNode; // the node wich will hold our entities
201
202	void createGrassMesh()
203	{
204	// Each grass section is 3 planes at 60 degrees to each other
205	// Normals point straight up to simulate correct lighting
206	MeshPtr msh = MeshManager::getSingleton().createManual(GRASS_MESH_NAME,
207	ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
208	SubMesh* sm = msh->createSubMesh();
209	sm->useSharedVertices = false;
210	sm->vertexData = new VertexData();
211	sm->vertexData->vertexStart = 0;
212	sm->vertexData->vertexCount = 12;
213	VertexDeclaration* dcl = sm->vertexData->vertexDeclaration;
214	size_t offset = 0;
215	dcl->addElement(0, offset, VET_FLOAT3, VES_POSITION);
216	offset += VertexElement::getTypeSize(VET_FLOAT3);
217	dcl->addElement(0, offset, VET_FLOAT3, VES_NORMAL);
218	offset += VertexElement::getTypeSize(VET_FLOAT3);
219	dcl->addElement(0, offset, VET_FLOAT2, VES_TEXTURE_COORDINATES);
220	offset += VertexElement::getTypeSize(VET_FLOAT2);
221
222	HardwareVertexBufferSharedPtr vbuf = HardwareBufferManager::getSingleton()
223	.createVertexBuffer(
224	offset, 12, HardwareBuffer::HBU_STATIC_WRITE_ONLY);
225	float* pReal = static_cast<float*>(vbuf->lock(HardwareBuffer::HBL_DISCARD));
226	Vector3 baseVec(GRASS_WIDTH/2, 0, 0);
227	Vector3 vec = baseVec;
228	Quaternion rot;
229	rot.FromAngleAxis(Degree(60), Vector3::UNIT_Y);
230	int i;
231	for (i = 0; i < 3; ++i)
232	{
233	// position
234	*pReal++ = -vec.x;
235	*pReal++ = GRASS_HEIGHT;
236	*pReal++ = -vec.z;
237	// normal
238	*pReal++ = 0;
239	*pReal++ = 1;
240	*pReal++ = 0;
241	// uv
242	*pReal++ = 0;
243	*pReal++ = 0;
244
245	// position
246	*pReal++ = vec.x;
247	*pReal++ = GRASS_HEIGHT;
248	*pReal++ = vec.z;
249	// normal
250	*pReal++ = 0;
251	*pReal++ = 1;
252	*pReal++ = 0;
253	// uv
254	*pReal++ = 1;
255	*pReal++ = 0;
256
257	// position
258	*pReal++ = -vec.x;
259	*pReal++ = 0;
260	*pReal++ = -vec.z;
261	// normal
262	*pReal++ = 0;
263	*pReal++ = 1;
264	*pReal++ = 0;
265	// uv
266	*pReal++ = 0;
267	*pReal++ = 1;
268
269	// position
270	*pReal++ = vec.x;
271	*pReal++ = 0;
272	*pReal++ = vec.z;
273	// normal
274	*pReal++ = 0;
275	*pReal++ = 1;
276	*pReal++ = 0;
277	// uv
278	*pReal++ = 1;
279	*pReal++ = 1;
280
281	vec = rot * vec;
282	}
283	vbuf->unlock();
284	sm->vertexData->vertexBufferBinding->setBinding(0, vbuf);
285	sm->indexData->indexCount = 6*3;
286	sm->indexData->indexBuffer = HardwareBufferManager::getSingleton()
287	.createIndexBuffer(HardwareIndexBuffer::IT_16BIT, 6*3,
288	HardwareBuffer::HBU_STATIC_WRITE_ONLY);
289	uint16* pI = static_cast<uint16*>(
290	sm->indexData->indexBuffer->lock(HardwareBuffer::HBL_DISCARD));
291	for (i = 0; i < 3; ++i)
292	{
293	int off = i*4;
294	*pI++ = 0 + off;
295	*pI++ = 3 + off;
296	*pI++ = 1 + off;
297
298	*pI++ = 0 + off;
299	*pI++ = 2 + off;
300	*pI++ = 3 + off;
301	}
302
303	sm->indexData->indexBuffer->unlock();
304
305	sm->setMaterialName(GRASS_MATERIAL);
306	msh->load();
307
308	}
309
310	void setupLighting()
311	{
312	// Set ambient light
313	mSceneMgr->setAmbientLight(ColourValue(0.2, 0.2, 0.2));
314	// Point light, movable, reddish
315	mLight = mSceneMgr->createLight("Light2");
316	mLight->setDiffuseColour(mMinLightColour);
317	mLight->setSpecularColour(1, 1, 1);
318	mLight->setAttenuation(8000,1,0.0005,0);
319
320	// Create light node
321	mLightNode = mSceneMgr->getRootSceneNode()->createChildSceneNode(
322	"MovingLightNode");
323	mLightNode->attachObject(mLight);
324	// create billboard set
325	BillboardSet* bbs = mSceneMgr->createBillboardSet("lightbbs", 1);
326	bbs->setMaterialName("Examples/Flare");
327	Billboard* bb = bbs->createBillboard(0,0,0,mMinLightColour);
328	// attach
329	mLightNode->attachObject(bbs);
330
331	// create controller, after this is will get updated on its own
332	ControllerFunctionRealPtr func = ControllerFunctionRealPtr(
333	new WaveformControllerFunction(Ogre::WFT_SINE, 0.0, 0.5));
334	ControllerManager& contMgr = ControllerManager::getSingleton();
335	ControllerValueRealPtr val = ControllerValueRealPtr(
336	new LightWibbler(mLight, bb, mMinLightColour, mMaxLightColour,
337	mMinFlareSize, mMaxFlareSize));
338	Controller<Real>* controller = contMgr.createController(
339	contMgr.getFrameTimeSource(), val, func);
340
341	//mLight->setPosition(Vector3(300,250,-300));
342	mLightNode->setPosition(Vector3(300,250,-300));
343
344
345	// Create a track for the light
346	Animation* anim = mSceneMgr->createAnimation("LightTrack", 20);
347	// Spline it for nice curves
348	anim->setInterpolationMode(Animation::IM_SPLINE);
349	// Create a track to animate the camera's node
350	AnimationTrack* track = anim->createTrack(0, mLightNode);
351	// Setup keyframes
352	KeyFrame* key = track->createKeyFrame(0); // A startposition
353	key->setTranslate(Vector3(300,550,-300));
354	key = track->createKeyFrame(2);//B
355	key->setTranslate(Vector3(150,600,-250));
356	key = track->createKeyFrame(4);//C
357	key->setTranslate(Vector3(-150,650,-100));
358	key = track->createKeyFrame(6);//D
359	key->setTranslate(Vector3(-400,500,-200));
360	key = track->createKeyFrame(8);//E
361	key->setTranslate(Vector3(-200,500,-400));
362	key = track->createKeyFrame(10);//F
363	key->setTranslate(Vector3(-100,450,-200));
364	key = track->createKeyFrame(12);//G
365	key->setTranslate(Vector3(-100,400,180));
366	key = track->createKeyFrame(14);//H
367	key->setTranslate(Vector3(0,250,600));
368	key = track->createKeyFrame(16);//I
369	key->setTranslate(Vector3(100,650,100));
370	key = track->createKeyFrame(18);//J
371	key->setTranslate(Vector3(250,600,0));
372	key = track->createKeyFrame(20);//K == A
373	key->setTranslate(Vector3(300,550,-300));
374	// Create a new animation state to track this
375	mAnimState = mSceneMgr->createAnimationState("LightTrack");
376	mAnimState->setEnabled(true);
377	}
378
379	void createScene(void)
380	{
381
382	mSceneMgr->setSkyBox(true, "Examples/SpaceSkyBox");
383
384	setupLighting();
385
386
387	Plane plane;
388	plane.normal = Vector3::UNIT_Y;
389	plane.d = 0;
390	MeshManager::getSingleton().createPlane("Myplane",
391	ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, plane,
392	14500,14500,10,10,true,1,50,50,Vector3::UNIT_Z);
393	Entity* pPlaneEnt = mSceneMgr->createEntity( "plane", "Myplane" );
394	pPlaneEnt->setMaterialName("Examples/GrassFloor");
395	pPlaneEnt->setCastShadows(false);
396	mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(pPlaneEnt);
397
398	Vector3 minV(-2000,0,-2000);
399	Vector3 maxV(2000,0,2000);
400
401
402	createGrassMesh();
403
404	Entity* e = mSceneMgr->createEntity("1", GRASS_MESH_NAME);
405
406	StaticGeometry* s = mSceneMgr->createStaticGeometry("bing");
407	s->setRegionDimensions(Vector3(1000,1000,1000));
408	// Set the region origin so the centre is at 0 world
409	s->setOrigin(Vector3(-500, 500, -500));
410
411	for (int x = -1950; x < 1950; x += 150)
412	{
413	for (int z = -1950; z < 1950; z += 150)
414	{
415	Vector3 pos(
416	x + Math::RangeRandom(-25, 25),
417	0,
418	z + Math::RangeRandom(-25, 25));
419	Quaternion orientation;
420	orientation.FromAngleAxis(
421	Degree(Math::RangeRandom(0, 359)),
422	Vector3::UNIT_Y);
423	Vector3 scale(
424	1, Math::RangeRandom(0.85, 1.15), 1);
425	s->addEntity(e, pos, orientation, scale);
426	}
427
428	}
429
430	s->build();
431	mStaticGeom = s;
432
433	// Put an Ogre head in the middle
434	MeshPtr m = MeshManager::getSingleton().load("ogrehead.mesh",
435	ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
436	unsigned short src, dest;
437	if (!m->suggestTangentVectorBuildParams(src, dest))
438	{
439	m->buildTangentVectors(src, dest);
440	}
441	e = mSceneMgr->createEntity("head", "ogrehead.mesh");
442	e->setMaterialName("Examples/OffsetMapping/Specular");
443	SceneNode* headNode = mSceneMgr->getRootSceneNode()->createChildSceneNode();
444	headNode->attachObject(e);
445	headNode->setScale(7,7,7);
446	headNode->setPosition(0,200,0);
447	e->setNormaliseNormals(true);
448	mCamera->move(Vector3(0,350,0));
449	}
450
451	// Create new frame listener
452	void createFrameListener(void)
453	{
454	mFrameListener= new GrassListener(mWindow, mCamera, mSceneMgr);
455	mRoot->addFrameListener(mFrameListener);
456	}
457	};
458
459	#ifdef __cplusplus
460	extern "C" {
461	#endif
462
463	#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
464	INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )
465	#else
466	int main(int argc, char **argv)
467	#endif
468	{
469	// Create application object
470	Grass_Application app;
471
472	try {
473	app.go();
474	} catch( Exception& e ) {
475	#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
476	MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK \| MB_ICONERROR \| MB_TASKMODAL);
477	#else
478	std::cerr << "An exception has occured: " << e.getFullDescription();
479	#endif
480	}
481
482	return 0;
483	}
484
485	#ifdef __cplusplus
486	}
487	#endif
488

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