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OpenSceneGraph/include/osg/BufferObject
Robert Osfield 117c791a3b Added osg::BufferObject and a made a number associated to accomodate this 
new class. osg::BufferObject wraps up OpenGL pixel and array buffer objects.
Currently implementation is work in progress.
2005-02-09 10:39:45 +00:00

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSG_BUFFEROBJECT
#define OSG_BUFFEROBJECT 1
#include <osg/State>
#include <osg/buffered_value>
#ifndef GL_ARB_vertex_buffer_object
#define GL_ARB_vertex_buffer_object
// for compatibility with gl.h headers that don't support VBO,
#if defined(_WIN64)
typedef __int64 GLintptrARB;
typedef __int64 GLsizeiptrARB;
#elif defined(__ia64__) || defined(__x86_64__)
typedef long int GLintptrARB;
typedef long int GLsizeiptrARB;
#else
typedef int GLintptrARB;
typedef int GLsizeiptrARB;
#endif
#define GL_ARRAY_BUFFER_ARB 0x8892
#define GL_ELEMENT_ARRAY_BUFFER_ARB 0x8893
#define GL_PIXEL_PACK_BUFFER_ARB 0x88EB
#define GL_PIXEL_UNPACK_BUFFER_ARB 0x88EC
#define GL_ARRAY_BUFFER_BINDING_ARB 0x8894
#define GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB 0x8895
#define GL_VERTEX_ARRAY_BUFFER_BINDING_ARB 0x8896
#define GL_NORMAL_ARRAY_BUFFER_BINDING_ARB 0x8897
#define GL_COLOR_ARRAY_BUFFER_BINDING_ARB 0x8898
#define GL_INDEX_ARRAY_BUFFER_BINDING_ARB 0x8899
#define GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING_ARB 0x889A
#define GL_EDGE_FLAG_ARRAY_BUFFER_BINDING_ARB 0x889B
#define GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING_ARB 0x889C
#define GL_FOG_COORDINATE_ARRAY_BUFFER_BINDING_ARB 0x889D
#define GL_WEIGHT_ARRAY_BUFFER_BINDING_ARB 0x889E
#define GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING_ARB 0x889F
#define GL_PIXEL_PACK_BUFFER_BINDING_ARB 0x88ED
#define GL_PIXEL_UNPACK_BUFFER_BINDING_ARB 0x88EF
#define GL_STREAM_DRAW_ARB 0x88E0
#define GL_STREAM_READ_ARB 0x88E1
#define GL_STREAM_COPY_ARB 0x88E2
#define GL_STATIC_DRAW_ARB 0x88E4
#define GL_STATIC_READ_ARB 0x88E5
#define GL_STATIC_COPY_ARB 0x88E6
#define GL_DYNAMIC_DRAW_ARB 0x88E8
#define GL_DYNAMIC_READ_ARB 0x88E9
#define GL_DYNAMIC_COPY_ARB 0x88EA
#define GL_READ_ONLY_ARB 0x88B8
#define GL_WRITE_ONLY_ARB 0x88B9
#define GL_READ_WRITE_ARB 0x88BA
#define GL_BUFFER_SIZE_ARB 0x8764
#define GL_BUFFER_USAGE_ARB 0x8765
#define GL_BUFFER_ACCESS_ARB 0x88BB
#define GL_BUFFER_MAPPED_ARB 0x88BC
#define GL_BUFFER_MAP_POINTER_ARB 0x88BD
#endif
namespace osg
{
class SG_EXPORT BufferObject : public Object
{
public:
BufferObject();
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
BufferObject(const BufferObject& bo,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const BufferObject*>(obj)!=NULL; }
virtual const char* libraryName() const { return "osg"; }
virtual const char* className() const { return "BufferObject"; }
struct BufferEntry
{
BufferEntry(): dataSize(0),offset(0) {}
BufferEntry(const BufferEntry& be): modifiedCount(be.modifiedCount),dataSize(be.dataSize),offset(be.offset) {}
BufferEntry& operator = (const BufferEntry& be) { modifiedCount=be.modifiedCount; dataSize=be.dataSize; offset=be.offset; return *this; }
mutable buffered_value<unsigned int> modifiedCount;
unsigned int dataSize;
unsigned int offset;
};
inline bool isBufferObjectSupported(unsigned int contextID) const { return getExtensions(contextID,true)->isBufferObjectSupported(); }
inline GLuint& buffer(unsigned int contextID) const { return _bufferObjectList[contextID]; }
inline void bindBuffer(unsigned int contextID) const
{
Extensions* extensions = getExtensions(contextID,true);
extensions->glBindBuffer(_target,_bufferObjectList[contextID]);
}
inline void unbindBuffer(unsigned int contextID) const
{
Extensions* extensions = getExtensions(contextID,true);
extensions->glBindBuffer(_target,0);
}
virtual bool needsCompile(unsigned int contextID) const = 0;
virtual void compileBuffer(State& state) const = 0;
void releaseBuffer(State* state) const;
/** Use deleteVertexBufferObject instead of glDeleteBuffers to allow
* OpenGL buffer objects to be cached until they can be deleted
* by the OpenGL context in which they were created, specified
* by contextID.*/
static void deleteBufferObject(unsigned int contextID,GLuint globj);
/** flush all the cached display list which need to be deleted
* in the OpenGL context related to contextID.*/
void BufferObject::flushDeletedBufferObjects(unsigned int contextID,double /*currentTime*/, double& availableTime);
/** Extensions class which encapsulates the querying of extensions and
* associated function pointers, and provide convenience wrappers to
* check for the extensions or use the associated functions.*/
class SG_EXPORT Extensions : public osg::Referenced
{
public:
Extensions();
Extensions(const Extensions& rhs);
void lowestCommonDenominator(const Extensions& rhs);
void setupGLExtenions();
bool isBufferObjectSupported() const { return _glGenBuffers!=0; }
void glGenBuffers (GLsizei n, GLuint *buffers) const;
void glBindBuffer (GLenum target, GLuint buffer) const;
void glBufferData (GLenum target, GLsizeiptrARB size, const GLvoid *data, GLenum usage) const;
void glBufferSubData (GLenum target, GLintptrARB offset, GLsizeiptrARB size, const GLvoid *data) const;
void glDeleteBuffers (GLsizei n, const GLuint *buffers) const;
GLboolean glIsBuffer (GLuint buffer) const;
void glGetBufferSubData (GLenum target, GLintptrARB offset, GLsizeiptrARB size, GLvoid *data) const;
GLvoid* glMapBuffer (GLenum target, GLenum access) const;
GLboolean glUnmapBuffer (GLenum target) const;
void glGetBufferParameteriv (GLenum target, GLenum pname, GLint *params) const;
void glGetBufferPointerv (GLenum target, GLenum pname, GLvoid* *params) const;
protected:
typedef void (APIENTRY * GenBuffersProc) (GLsizei n, GLuint *buffers);
typedef void (APIENTRY * BindBufferProc) (GLenum target, GLuint buffer);
typedef void (APIENTRY * BufferDataProc) (GLenum target, GLsizeiptrARB size, const GLvoid *data, GLenum usage);
typedef void (APIENTRY * BufferSubDataProc) (GLenum target, GLintptrARB offset, GLsizeiptrARB size, const GLvoid *data);
typedef void (APIENTRY * DeleteBuffersProc) (GLsizei n, const GLuint *buffers);
typedef GLboolean (APIENTRY * IsBufferProc) (GLuint buffer);
typedef void (APIENTRY * GetBufferSubDataProc) (GLenum target, GLintptrARB offset, GLsizeiptrARB size, GLvoid *data);
typedef GLvoid* (APIENTRY * MapBufferProc) (GLenum target, GLenum access);
typedef GLboolean (APIENTRY * UnmapBufferProc) (GLenum target);
typedef void (APIENTRY * GetBufferParameterivProc) (GLenum target, GLenum pname, GLint *params);
typedef void (APIENTRY * GetBufferPointervProc) (GLenum target, GLenum pname, GLvoid* *params);
GenBuffersProc _glGenBuffers;
BindBufferProc _glBindBuffer;
BufferDataProc _glBufferData;
BufferSubDataProc _glBufferSubData;
DeleteBuffersProc _glDeleteBuffers;
IsBufferProc _glIsBuffer;
GetBufferSubDataProc _glGetBufferSubData;
MapBufferProc _glMapBuffer;
UnmapBufferProc _glUnmapBuffer;
GetBufferParameterivProc _glGetBufferParameteriv;
GetBufferPointervProc _glGetBufferPointerv;
};
/** Function to call to get the extension of a specified context.
* If the Exentsion object for that context has not yet been created
* and the 'createIfNotInitalized' flag been set to false then returns NULL.
* If 'createIfNotInitalized' is true then the Extensions object is
* automatically created. However, in this case the extension object is
* only created with the graphics context associated with ContextID..*/
static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
/** setExtensions allows users to override the extensions across graphics contexts.
* typically used when you have different extensions supported across graphics pipes
* but need to ensure that they all use the same low common denominator extensions.*/
static void setExtensions(unsigned int contextID,Extensions* extensions);
protected:
virtual ~BufferObject();
unsigned int computeRequiredTotalSize() const;
typedef osg::buffered_value<GLuint> GLObjectList;
typedef std::pair< BufferEntry, ref_ptr<Array> > BufferEntryArrayPair;
typedef std::pair< BufferEntry, ref_ptr<PrimitiveSet> > BufferEntryPrimitiveSetPair;
mutable GLObjectList _bufferObjectList;
GLenum _target;
GLenum _usage;
mutable unsigned int _totalSize;
};
class Image;
class SG_EXPORT PixelBufferObject : public BufferObject
{
public:
PixelBufferObject(osg::Image* image=0);
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
PixelBufferObject(const PixelBufferObject& pbo,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
META_Object(osg,PixelBufferObject);
typedef std::pair< BufferEntry, Image* > BufferEntryImagePair;
void setImage(osg::Image* image);
Image* getImage() { return _bufferEntryImagePair.second; }
const Image* getImage() const { return _bufferEntryImagePair.second; }
unsigned int offset() const { return _bufferEntryImagePair.first.offset; }
virtual bool needsCompile(unsigned int contextID) const;
virtual void compileBuffer(State& state) const;
protected:
virtual ~PixelBufferObject();
unsigned int computeRequiredTotalSize() const;
BufferEntryImagePair _bufferEntryImagePair;
};
}
#endif
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