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VBO_CONTAINER: Changed new[]/delete[] pairs to realloc(), possibly reducing memory fragmentation and the container shrinking time.

This commit is contained in:
Maciej Suminski 2013-06-28 10:47:41 +02:00
parent 3f1da8b2c0
commit bc8ea55092
2 changed files with 12 additions and 13 deletions
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19
common/gal/opengl/vbo_container.cpp
View File

@ -29,6 +29,7 @@
#include <gal/opengl/vbo_container.h>
#include <cstring>
#include <cstdlib>
#include <wx/log.h>
#ifdef __WXDEBUG__
#include <profile.h>
@ -42,7 +43,7 @@ VBO_CONTAINER::VBO_CONTAINER( int aSize ) :
// By default no shader is used
m_shader[0] = 0;
m_vertices = new VBO_VERTEX[aSize];
m_vertices = static_cast<VBO_VERTEX*>( malloc( aSize * sizeof( VBO_VERTEX ) ) );
// In the beginning there is only free space
m_freeChunks.insert( Chunk( aSize, 0 ) );
@ -51,7 +52,7 @@ VBO_CONTAINER::VBO_CONTAINER( int aSize ) :
VBO_CONTAINER::~VBO_CONTAINER()
{
delete[] m_vertices;
free( m_vertices );
}
@ -116,7 +117,7 @@ void VBO_CONTAINER::Add( VBO_ITEM* aVboItem, const VBO_VERTEX* aVertex, unsigned
itemSize * VBO_ITEM::VertByteSize );
// Return memory used by the previous chunk
free( it );
freeChunk( it );
itemChunkSize = newSize;
}
@ -266,7 +267,7 @@ unsigned int VBO_CONTAINER::allocate( VBO_ITEM* aVboItem, unsigned int aSize )
}
void VBO_CONTAINER::free( const ReservedChunkMap::iterator& aChunk )
void VBO_CONTAINER::freeChunk( const ReservedChunkMap::iterator& aChunk )
{
// Remove the chunk from the reserved chunks map and add to the free chunks map
int size = getChunkSize( *aChunk );
@ -289,7 +290,7 @@ bool VBO_CONTAINER::defragment( VBO_VERTEX* aTarget )
if( aTarget == NULL )
{
// No target was specified, so we have to allocate our own space
aTarget = new (std::nothrow) VBO_VERTEX[m_currentSize];
aTarget = static_cast<VBO_VERTEX*>( malloc( m_currentSize * sizeof( VBO_VERTEX ) ) );
if( aTarget == NULL )
{
wxLogError( wxT( "Run out of memory" ) );
@ -316,7 +317,7 @@ bool VBO_CONTAINER::defragment( VBO_VERTEX* aTarget )
newOffset += itemSize;
}
delete[] m_vertices;
free( m_vertices );
m_vertices = aTarget;
// Now there is only one big chunk of free memory
@ -363,15 +364,13 @@ bool VBO_CONTAINER::resizeContainer( unsigned int aNewSize )
copySize = m_currentSize;
}
VBO_VERTEX* newContainer = new (std::nothrow) VBO_VERTEX[aNewSize];
VBO_VERTEX* newContainer = static_cast<VBO_VERTEX*>( realloc( m_vertices, aNewSize * sizeof( VBO_VERTEX ) ) );
if( newContainer == NULL )
{
wxLogError( wxT( "Run out of memory" ) );
return false;
}
memcpy( newContainer, m_vertices, copySize * VBO_ITEM::VertByteSize );
delete[] m_vertices;
m_vertices = newContainer;
// Update variables
@ -391,7 +390,7 @@ bool VBO_CONTAINER::resizeContainer( unsigned int aNewSize )
{
// We found a chunk at the end of the container
m_freeChunks.erase( lastFree.base() );
// so we can merge it with the new free chunk
// so we can merge it with the new freeChunk chunk
m_freeChunks.insert( Chunk( aNewSize - m_currentSize + lastFreeSize, // size
m_currentSize - lastFreeSize ) ); // offset
}

6
include/gal/opengl/vbo_container.h
View File

@ -88,7 +88,7 @@ public:
inline void Free( VBO_ITEM* aVboItem )
{
ReservedChunkMap::iterator it = m_reservedChunks.find( aVboItem );
free( it );
freeChunk( it );
// Dynamic memory freeing, there is no point in holding
// a large amount of memory when there is no use for it
@ -294,11 +294,11 @@ private:
bool resizeContainer( unsigned int aNewSize );
/**
* Function free()
* Function freeChunk()
* Frees the space described in aChunk and returns it to the free space pool.
* @param aChunk is a space to be freed.
*/
void free( const ReservedChunkMap::iterator& aChunk );
void freeChunk( const ReservedChunkMap::iterator& aChunk );
///< How many vertices we can store in the container
unsigned int m_freeSpace;