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Brian Harris
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neo/renderer/BufferObject.h
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202
neo/renderer/BufferObject.h
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/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#ifndef __BUFFEROBJECT_H__
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#define __BUFFEROBJECT_H__
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/*
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================================================================================================
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Buffer Objects
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================================================================================================
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*/
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class idIndexBuffer;
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enum bufferMapType_t {
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BM_READ, // map for reading
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BM_WRITE // map for writing
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};
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// Returns all targets to virtual memory use instead of buffer object use.
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// Call this before doing any conventional buffer reads, like screenshots.
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void UnbindBufferObjects();
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/*
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================================================
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idVertexBuffer
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================================================
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*/
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class idVertexBuffer {
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public:
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idVertexBuffer();
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~idVertexBuffer();
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// Allocate or free the buffer.
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bool AllocBufferObject( const void * data, int allocSize );
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void FreeBufferObject();
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// Make this buffer a reference to another buffer.
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void Reference( const idVertexBuffer & other );
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void Reference( const idVertexBuffer & other, int refOffset, int refSize );
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// Copies data to the buffer. 'size' may be less than the originally allocated size.
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void Update( const void * data, int updateSize ) const;
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void * MapBuffer( bufferMapType_t mapType ) const;
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idDrawVert * MapVertexBuffer( bufferMapType_t mapType ) const { return static_cast< idDrawVert * >( MapBuffer( mapType ) ); }
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void UnmapBuffer() const;
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bool IsMapped() const { return ( size & MAPPED_FLAG ) != 0; }
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int GetSize() const { return ( size & ~MAPPED_FLAG ); }
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int GetAllocedSize() const { return ( ( size & ~MAPPED_FLAG ) + 15 ) & ~15; }
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void * GetAPIObject() const { return apiObject; }
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int GetOffset() const { return ( offsetInOtherBuffer & ~OWNS_BUFFER_FLAG ); }
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private:
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int size; // size in bytes
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int offsetInOtherBuffer; // offset in bytes
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void * apiObject;
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// sizeof() confuses typeinfo...
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static const int MAPPED_FLAG = 1 << ( 4 /* sizeof( int ) */ * 8 - 1 );
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static const int OWNS_BUFFER_FLAG = 1 << ( 4 /* sizeof( int ) */ * 8 - 1 );
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private:
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void ClearWithoutFreeing();
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void SetMapped() const { const_cast< int & >( size ) |= MAPPED_FLAG; }
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void SetUnmapped() const { const_cast< int & >( size ) &= ~MAPPED_FLAG; }
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bool OwnsBuffer() const { return ( ( offsetInOtherBuffer & OWNS_BUFFER_FLAG ) != 0 ); }
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DISALLOW_COPY_AND_ASSIGN( idVertexBuffer );
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};
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/*
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================================================
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idIndexBuffer
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================================================
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*/
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class idIndexBuffer {
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public:
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idIndexBuffer();
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~idIndexBuffer();
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// Allocate or free the buffer.
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bool AllocBufferObject( const void * data, int allocSize );
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void FreeBufferObject();
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// Make this buffer a reference to another buffer.
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void Reference( const idIndexBuffer & other );
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void Reference( const idIndexBuffer & other, int refOffset, int refSize );
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// Copies data to the buffer. 'size' may be less than the originally allocated size.
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void Update( const void * data, int updateSize ) const;
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void * MapBuffer( bufferMapType_t mapType ) const;
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triIndex_t * MapIndexBuffer( bufferMapType_t mapType ) const { return static_cast< triIndex_t * >( MapBuffer( mapType ) ); }
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void UnmapBuffer() const;
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bool IsMapped() const { return ( size & MAPPED_FLAG ) != 0; }
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int GetSize() const { return ( size & ~MAPPED_FLAG ); }
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int GetAllocedSize() const { return ( ( size & ~MAPPED_FLAG ) + 15 ) & ~15; }
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void * GetAPIObject() const { return apiObject; }
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int GetOffset() const { return ( offsetInOtherBuffer & ~OWNS_BUFFER_FLAG ); }
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private:
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int size; // size in bytes
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int offsetInOtherBuffer; // offset in bytes
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void * apiObject;
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// sizeof() confuses typeinfo...
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static const int MAPPED_FLAG = 1 << ( 4 /* sizeof( int ) */ * 8 - 1 );
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static const int OWNS_BUFFER_FLAG = 1 << ( 4 /* sizeof( int ) */ * 8 - 1 );
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private:
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void ClearWithoutFreeing();
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void SetMapped() const { const_cast< int & >( size ) |= MAPPED_FLAG; }
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void SetUnmapped() const { const_cast< int & >( size ) &= ~MAPPED_FLAG; }
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bool OwnsBuffer() const { return ( ( offsetInOtherBuffer & OWNS_BUFFER_FLAG ) != 0 ); }
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DISALLOW_COPY_AND_ASSIGN( idIndexBuffer );
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};
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/*
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================================================
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idJointBuffer
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IMPORTANT NOTICE: on the PC, binding to an offset in uniform buffer objects
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is limited to GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, which is 256 on current nvidia cards,
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so joint offsets, which are multiples of 48 bytes, must be in multiples of 16 = 768 bytes.
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================================================
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*/
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class idJointBuffer {
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public:
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idJointBuffer();
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~idJointBuffer();
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// Allocate or free the buffer.
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bool AllocBufferObject( const float * joints, int numAllocJoints );
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void FreeBufferObject();
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// Make this buffer a reference to another buffer.
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void Reference( const idJointBuffer & other );
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void Reference( const idJointBuffer & other, int jointRefOffset, int numRefJoints );
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// Copies data to the buffer. 'numJoints' may be less than the originally allocated size.
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void Update( const float * joints, int numUpdateJoints ) const;
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float * MapBuffer( bufferMapType_t mapType ) const;
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void UnmapBuffer() const;
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bool IsMapped() const { return ( numJoints & MAPPED_FLAG ) != 0; }
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int GetNumJoints() const { return ( numJoints & ~MAPPED_FLAG ); }
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int GetAllocedSize() const { return ( numJoints & ~MAPPED_FLAG ) * 3 * 4 * sizeof( float ); }
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void * GetAPIObject() const { return apiObject; }
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int GetOffset() const { return ( offsetInOtherBuffer & ~OWNS_BUFFER_FLAG ); }
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void Swap( idJointBuffer & other );
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private:
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int numJoints;
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int offsetInOtherBuffer; // offset in bytes
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void * apiObject;
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// sizeof() confuses typeinfo...
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static const int MAPPED_FLAG = 1 << ( 4 /* sizeof( int ) */ * 8 - 1 );
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static const int OWNS_BUFFER_FLAG = 1 << ( 4 /* sizeof( int ) */ * 8 - 1 );
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private:
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void ClearWithoutFreeing();
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void SetMapped() const { const_cast< int & >( numJoints ) |= MAPPED_FLAG; }
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void SetUnmapped() const { const_cast< int & >( numJoints ) &= ~MAPPED_FLAG; }
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bool OwnsBuffer() const { return ( ( offsetInOtherBuffer & OWNS_BUFFER_FLAG ) != 0 ); }
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DISALLOW_COPY_AND_ASSIGN( idJointBuffer );
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};
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#endif // !__BUFFEROBJECT_H__
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