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source: downloads/RenderSystems/GL/include/OgreGLHardwareBufferManager.h @ 1

Last change on this file since 1 was 1, checked in by landauf, 17 years ago
File size: 3.4 KB
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1/*
2-----------------------------------------------------------------------------
3This source file is part of OGRE
4    (Object-oriented Graphics Rendering Engine)
5For the latest info, see http://www.ogre3d.org/
6
7Copyright (c) 2000-2006 Torus Knot Software Ltd
8Also see acknowledgements in Readme.html
9
10This program is free software; you can redistribute it and/or modify it under
11the terms of the GNU Lesser General Public License as published by the Free Software
12Foundation; either version 2 of the License, or (at your option) any later
13version.
14
15This program is distributed in the hope that it will be useful, but WITHOUT
16ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19You should have received a copy of the GNU Lesser General Public License along with
20this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22http://www.gnu.org/copyleft/lesser.txt.
23
24You may alternatively use this source under the terms of a specific version of
25the OGRE Unrestricted License provided you have obtained such a license from
26Torus Knot Software Ltd.
27-----------------------------------------------------------------------------
28*/
29#ifndef __GLHARWAREBUFFERMANAGER_H__
30#define __GLHARWAREBUFFERMANAGER_H__
31
32#include "OgreGLPrerequisites.h"
33#include "OgreHardwareBufferManager.h"
34
35namespace Ogre {
36
37// Threshold at which glMapBuffer becomes more efficient than glBufferSubData (32k?)
38// non-Win32 machines are having issues with this, looks like buffer corruption
39// disable for now until we figure out where the problem lies
40#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
41#       define OGRE_GL_MAP_BUFFER_THRESHOLD (1024 * 32)
42#else
43#       define OGRE_GL_MAP_BUFFER_THRESHOLD 0
44#endif
45
46    /** Implementation of HardwareBufferManager for OpenGL. */
47    class _OgrePrivate GLHardwareBufferManager : public HardwareBufferManager
48    {
49        protected:
50                char* mScratchBufferPool;
51                OGRE_MUTEX(mScratchMutex)
52
53    public:
54        GLHardwareBufferManager();
55        ~GLHardwareBufferManager();
56        /// Creates a vertex buffer
57        HardwareVertexBufferSharedPtr createVertexBuffer(size_t vertexSize, 
58            size_t numVerts, HardwareBuffer::Usage usage, bool useShadowBuffer = false);
59        /// Create a hardware vertex buffer
60        HardwareIndexBufferSharedPtr createIndexBuffer(
61            HardwareIndexBuffer::IndexType itype, size_t numIndexes, 
62            HardwareBuffer::Usage usage, bool useShadowBuffer = false);
63
64        /// Utility function to get the correct GL usage based on HBU's
65        static GLenum getGLUsage(unsigned int usage);
66
67        /// Utility function to get the correct GL type based on VET's
68        static GLenum getGLType(unsigned int type);
69
70                /** Allocator method to allow us to use a pool of memory as a scratch
71                        area for hardware buffers. This is because glMapBuffer is incredibly
72                        inefficient, seemingly no matter what options we give it. So for the
73                        period of lock/unlock, we will instead allocate a section of a local
74                        memory pool, and use glBufferSubDataARB / glGetBufferSubDataARB
75                        instead.
76                */
77                void* allocateScratch(uint32 size);
78
79                /// @see allocateScratch
80                void deallocateScratch(void* ptr);
81    };
82
83}
84
85#endif // __GLHARWAREBUFFERMANAGER_H__
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