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OgreMeshManager.h @ 1812

Revision 1812, 20.5 KB checked in by gumbau, 18 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://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	#ifndef __MeshManager_H__
26	#define __MeshManager_H__
27
28	#include "OgrePrerequisites.h"
29
30	#include "OgreResourceManager.h"
31	#include "OgreSingleton.h"
32	#include "OgreVector3.h"
33	#include "OgreHardwareBuffer.h"
34	#include "OgreMesh.h"
35	#include "OgrePatchMesh.h"
36
37	namespace Ogre {
38
39	/** Handles the management of mesh resources.
40	@remarks
41	This class deals with the runtime management of
42	mesh data; like other resource managers it handles
43	the creation of resources (in this case mesh data),
44	working within a fixed memory budget.
45	*/
46	class _OgreExport MeshManager: public ResourceManager, public Singleton<MeshManager>,
47	public ManualResourceLoader
48	{
49	public:
50	MeshManager();
51	~MeshManager();
52
53	/** Initialises the manager, only to be called by OGRE internally. */
54	void _initialise(void);
55
56	/** Loads a mesh from a file, making it immediately available for use.
57	@note
58	If the model has already been loaded, the existing instance
59	will be returned.
60	@remarks
61	Ogre loads model files from it's own proprietary
62	format called .mesh. This is because having a single file
63	format is better for runtime performance, and we also have
64	control over pre-processed data (such as
65	collision boxes, LOD reductions etc).
66	@param filename The name of the .mesh file
67	@param groupName The name of the resource group to assign the mesh to
68	@param vertexBufferUsage The usage flags with which the vertex buffer(s)
69	will be created
70	@param indexBufferUsage The usage flags with which the index buffer(s) created for
71	this mesh will be created with.
72	@param vertexBufferShadowed If true, the vertex buffers will be shadowed by system memory
73	copies for faster read access
74	@param indexBufferShadowed If true, the index buffers will be shadowed by system memory
75	copies for faster read access
76	@param priority The priority of this mesh in the resource system
77	*/
78	MeshPtr load( const String& filename, const String& groupName,
79	HardwareBuffer::Usage vertexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
80	HardwareBuffer::Usage indexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
81	bool vertexBufferShadowed = true, bool indexBufferShadowed = true);
82
83
84	/** Creates a new Mesh specifically for manual definition rather
85	than loading from an object file.
86	@remarks
87	Note that once you've defined your mesh, you must call Mesh::_setBounds and
88	Mesh::_setBoundingRadius in order to define the bounds of your mesh. In previous
89	versions of OGRE you could call Mesh::_updateBounds, but OGRE's support of
90	write-only vertex buffers makes this no longer appropriate.
91	@param name The name to give the new mesh
92	@param groupName The name of the resource group to assign the mesh to
93	@param loader ManualResourceLoader which will be called to load this mesh
94	when the time comes. It is recommended that you populate this field
95	in order that the mesh can be rebuilt should the need arise
96	*/
97	MeshPtr createManual( const String& name, const String& groupName,
98	ManualResourceLoader* loader = 0);
99
100	/** Creates a basic plane, by default majoring on the x/y axes facing positive Z.
101	@param
102	name The name to give the resulting mesh
103	@param
104	groupName The name of the resource group to assign the mesh to
105	@param
106	plane The orientation of the plane and distance from the origin
107	@param
108	width The width of the plane in world coordinates
109	@param
110	height The height of the plane in world coordinates
111	@param
112	xsegments The number of segements to the plane in the x direction
113	@param
114	ysegments The number of segements to the plane in the y direction
115	@param
116	normals If true, normals are created perpendicular to the plane
117	@param
118	numTexCoordSets The number of 2D texture coordinate sets created - by default the corners
119	are created to be the corner of the texture.
120	@param
121	uTile The number of times the texture should be repeated in the u direction
122	@param
123	vTile The number of times the texture should be repeated in the v direction
124	@param
125	upVector The 'Up' direction of the plane.
126	@param
127	vertexBufferUsage The usage flag with which the vertex buffer for this plane will be created
128	@param
129	indexBufferUsage The usage flag with which the index buffer for this plane will be created
130	@param
131	vertexShadowBuffer If this flag is set to true, the vertex buffer will be created
132	with a system memory shadow buffer,
133	allowing you to read it back more efficiently than if it is in hardware
134	@param
135	indexShadowBuffer If this flag is set to true, the index buffer will be
136	created with a system memory shadow buffer,
137	allowing you to read it back more efficiently than if it is in hardware
138	*/
139	MeshPtr createPlane(
140	const String& name, const String& groupName, const Plane& plane,
141	Real width, Real height,
142	int xsegments = 1, int ysegments = 1,
143	bool normals = true, int numTexCoordSets = 1,
144	Real uTile = 1.0f, Real vTile = 1.0f, const Vector3& upVector = Vector3::UNIT_Y,
145	HardwareBuffer::Usage vertexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
146	HardwareBuffer::Usage indexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
147	bool vertexShadowBuffer = true, bool indexShadowBuffer = true);
148
149
150	/** Creates a plane, which because of it's texture coordinates looks like a curved
151	surface, useful for skies in a skybox.
152	@param
153	name The name to give the resulting mesh
154	@param
155	groupName The name of the resource group to assign the mesh to
156	@param
157	plane The orientation of the plane and distance from the origin
158	@param
159	width The width of the plane in world coordinates
160	@param
161	height The height of the plane in world coordinates
162	@param
163	curvature The curvature of the plane. Good values are
164	between 2 and 65. Higher values are more curved leading to
165	a smoother effect, lower values are less curved meaning
166	more distortion at the horizons but a better distance effect.
167	@param
168	xsegments The number of segements to the plane in the x direction
169	@param
170	ysegments The number of segements to the plane in the y direction
171	@param
172	normals If true, normals are created perpendicular to the plane
173	@param
174	numTexCoordSets The number of 2D texture coordinate sets created - by default the corners
175	are created to be the corner of the texture.
176	@param
177	uTile The number of times the texture should be repeated in the u direction
178	@param
179	vTile The number of times the texture should be repeated in the v direction
180	@param
181	upVector The 'Up' direction of the plane.
182	@param
183	orientation The orientation of the overall sphere that's used to create the illusion
184	@param
185	vertexBufferUsage The usage flag with which the vertex buffer for this plane will be created
186	@param
187	indexBufferUsage The usage flag with which the index buffer for this plane will be created
188	@param
189	vertexShadowBuffer If this flag is set to true, the vertex buffer will be created
190	with a system memory shadow buffer,
191	allowing you to read it back more efficiently than if it is in hardware
192	@param
193	indexShadowBuffer If this flag is set to true, the index buffer will be
194	created with a system memory shadow buffer,
195	allowing you to read it back more efficiently than if it is in hardware
196	@param ySegmentsToKeep The number of segments from the top of the dome
197	downwards to keep. -1 keeps all of them. This can save fillrate if
198	you cannot see much of the sky lower down.
199	*/
200	MeshPtr createCurvedIllusionPlane(
201	const String& name, const String& groupName, const Plane& plane,
202	Real width, Real height, Real curvature,
203	int xsegments = 1, int ysegments = 1,
204	bool normals = true, int numTexCoordSets = 1,
205	Real uTile = 1.0f, Real vTile = 1.0f, const Vector3& upVector = Vector3::UNIT_Y,
206	const Quaternion& orientation = Quaternion::IDENTITY,
207	HardwareBuffer::Usage vertexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
208	HardwareBuffer::Usage indexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
209	bool vertexShadowBuffer = true, bool indexShadowBuffer = true,
210	int ySegmentsToKeep = -1);
211
212	/** Creates a genuinely curved plane, by default majoring on the x/y axes facing positive Z.
213	@param
214	name The name to give the resulting mesh
215	@param
216	groupName The name of the resource group to assign the mesh to
217	@param
218	plane The orientation of the plane and distance from the origin
219	@param
220	width The width of the plane in world coordinates
221	@param
222	height The height of the plane in world coordinates
223	@param
224	bow The amount of 'bow' in the curved plane. (Could also be concidered the depth.)
225	@param
226	xsegments The number of segements to the plane in the x direction
227	@param
228	ysegments The number of segements to the plane in the y direction
229	@param
230	normals If true, normals are created perpendicular to the plane
231	@param
232	numTexCoordSets The number of 2D texture coordinate sets created - by default the corners
233	are created to be the corner of the texture.
234	@param
235	uTile The number of times the texture should be repeated in the u direction
236	@param
237	vTile The number of times the texture should be repeated in the v direction
238	@param
239	upVector The 'Up' direction of the plane.
240	@param
241	vertexBufferUsage The usage flag with which the vertex buffer for this plane will be created
242	@param
243	indexBufferUsage The usage flag with which the index buffer for this plane will be created
244	@param
245	vertexShadowBuffer If this flag is set to true, the vertex buffer will be created
246	with a system memory shadow buffer,
247	allowing you to read it back more efficiently than if it is in hardware
248	@param
249	indexShadowBuffer If this flag is set to true, the index buffer will be
250	created with a system memory shadow buffer,
251	allowing you to read it back more efficiently than if it is in hardware
252	*/
253	MeshPtr createCurvedPlane(
254	const String& name, const String& groupName, const Plane& plane,
255	Real width, Real height, Real bow = 0.5f,
256	int xsegments = 1, int ysegments = 1,
257	bool normals = false, int numTexCoordSets = 1,
258	Real xTile = 1.0f, Real yTile = 1.0f, const Vector3& upVector = Vector3::UNIT_Y,
259	HardwareBuffer::Usage vertexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
260	HardwareBuffer::Usage indexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
261	bool vertexShadowBuffer = true, bool indexShadowBuffer = true);
262
263	/** Creates a Bezier patch based on an array of control vertices.
264	@param
265	name The name to give the newly created mesh.
266	@param
267	groupName The name of the resource group to assign the mesh to
268	@param
269	controlPointBuffer A pointer to a buffer containing the vertex data which defines control points
270	of the curves rather than actual vertices. Note that you are expected to provide not
271	just position information, but potentially normals and texture coordinates too. The
272	format of the buffer is defined in the VertexDeclaration parameter
273	@param
274	decaration VertexDeclaration describing the contents of the buffer.
275	Note this declaration must _only_ draw on buffer source 0!
276	@param
277	width Specifies the width of the patch in control points.
278	Note this parameter must greater than or equal to 3.
279	@param
280	height Specifies the height of the patch in control points.
281	Note this parameter must greater than or equal to 3.
282	@param
283	uMaxSubdivisionLevel,vMaxSubdivisionLevel If you want to manually set the top level of subdivision,
284	do it here, otherwise let the system decide.
285	@param
286	visibleSide Determines which side of the patch (or both) triangles are generated for.
287	@param
288	vbUsage Vertex buffer usage flags. Recommend the default since vertex buffer should be static.
289	@param
290	ibUsage Index buffer usage flags. Recommend the default since index buffer should
291	be dynamic to change levels but not readable.
292	@param
293	vbUseShadow Flag to determine if a shadow buffer is generated for the vertex buffer. See
294	HardwareBuffer for full details.
295	@param
296	ibUseShadow Flag to determine if a shadow buffer is generated for the index buffer. See
297	HardwareBuffer for full details.
298	*/
299	PatchMeshPtr createBezierPatch(
300	const String& name, const String& groupName, void* controlPointBuffer,
301	VertexDeclaration *declaration, size_t width, size_t height,
302	size_t uMaxSubdivisionLevel = PatchSurface::AUTO_LEVEL,
303	size_t vMaxSubdivisionLevel = PatchSurface::AUTO_LEVEL,
304	PatchSurface::VisibleSide visibleSide = PatchSurface::VS_FRONT,
305	HardwareBuffer::Usage vbUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
306	HardwareBuffer::Usage ibUsage = HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY,
307	bool vbUseShadow = true, bool ibUseShadow = true);
308
309	/** Tells the mesh manager that all future meshes should prepare themselves for
310	shadow volumes on loading.
311	*/
312	void setPrepareAllMeshesForShadowVolumes(bool enable);
313	/** Retrieves whether all Meshes should prepare themselves for shadow volumes. */
314	bool getPrepareAllMeshesForShadowVolumes(void);
315
316	/** Override standard Singleton retrieval.
317	@remarks
318	Why do we do this? Well, it's because the Singleton
319	implementation is in a .h file, which means it gets compiled
320	into anybody who includes it. This is needed for the
321	Singleton template to work, but we actually only want it
322	compiled into the implementation of the class based on the
323	Singleton, not all of them. If we don't change this, we get
324	link errors when trying to use the Singleton-based class from
325	an outside dll.
326	@par
327	This method just delegates to the template version anyway,
328	but the implementation stays in this single compilation unit,
329	preventing link errors.
330	*/
331	static MeshManager& getSingleton(void);
332	/** Override standard Singleton retrieval.
333	@remarks
334	Why do we do this? Well, it's because the Singleton
335	implementation is in a .h file, which means it gets compiled
336	into anybody who includes it. This is needed for the
337	Singleton template to work, but we actually only want it
338	compiled into the implementation of the class based on the
339	Singleton, not all of them. If we don't change this, we get
340	link errors when trying to use the Singleton-based class from
341	an outside dll.
342	@par
343	This method just delegates to the template version anyway,
344	but the implementation stays in this single compilation unit,
345	preventing link errors.
346	*/
347	static MeshManager* getSingletonPtr(void);
348
349	/** Gets the factor by which the bounding box of an entity is padded.
350	Default is 0.01
351	*/
352	Real getBoundsPaddingFactor(void);
353
354	/** Sets the factor by which the bounding box of an entity is padded
355	*/
356	void setBoundsPaddingFactor(Real paddingFactor);
357
358	/** @see ManualResourceLoader::loadResource */
359	void loadResource(Resource* res);
360
361	protected:
362	/// @copydoc ResourceManager::createImpl
363	Resource* createImpl(const String& name, ResourceHandle handle,
364	const String& group, bool isManual, ManualResourceLoader* loader,
365	const NameValuePairList* createParams);
366
367	/** Utility method for tesselating 2D meshes.
368	*/
369	void tesselate2DMesh(SubMesh* pSub, int meshWidth, int meshHeight,
370	bool doubleSided = false,
371	HardwareBuffer::Usage indexBufferUsage = HardwareBuffer::HBU_STATIC_WRITE_ONLY,
372	bool indexSysMem = false);
373
374	void createPrefabPlane(void);
375
376	/** Enum identifying the types of manual mesh built by this manager */
377	enum MeshBuildType
378	{
379	MBT_PLANE,
380	MBT_CURVED_ILLUSION_PLANE,
381	MBT_CURVED_PLANE
382	};
383	/** Saved parameters used to (re)build a manual mesh built by this class */
384	struct MeshBuildParams
385	{
386	MeshBuildType type;
387	Plane plane;
388	Real width;
389	Real height;
390	Real curvature;
391	int xsegments;
392	int ysegments;
393	bool normals;
394	int numTexCoordSets;
395	Real xTile;
396	Real yTile;
397	Vector3 upVector;
398	Quaternion orientation;
399	HardwareBuffer::Usage vertexBufferUsage;
400	HardwareBuffer::Usage indexBufferUsage;
401	bool vertexShadowBuffer;
402	bool indexShadowBuffer;
403	int ySegmentsToKeep;
404	};
405	/** Map from resource pointer to parameter set */
406	typedef std::map<Resource*, MeshBuildParams> MeshBuildParamsMap;
407	MeshBuildParamsMap mMeshBuildParams;
408
409	/** Utility method for manual loading a plane */
410	void loadManualPlane(Mesh* pMesh, MeshBuildParams& params);
411	/** Utility method for manual loading a curved plane */
412	void loadManualCurvedPlane(Mesh* pMesh, MeshBuildParams& params);
413	/** Utility method for manual loading a curved illusion plane */
414	void loadManualCurvedIllusionPlane(Mesh* pMesh, MeshBuildParams& params);
415
416	bool mPrepAllMeshesForShadowVolumes;
417
418	//the factor by which the bounding box of an entity is padded
419	Real mBoundsPaddingFactor;
420	};
421
422
423	} //namespace
424
425	#endif

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