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Fixed cached container data corruption on resize (OpenGL GAL)

This commit is contained in:
Maciej Suminski 2016-08-08 14:18:25 +02:00
parent 9f5f0ab31b
commit c6e4f67589
1 changed files with 52 additions and 68 deletions
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64
common/gal/opengl/cached_container.cpp
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@ -296,23 +296,9 @@ bool CACHED_CONTAINER::reallocate( unsigned int aSize )
return false;
}
// Look for the free space chunk of at least given size
// Find a free space chunk >= aSize
FREE_CHUNK_MAP::iterator newChunk = m_freeChunks.lower_bound( aSize );
if( newChunk == m_freeChunks.end() )
{
// In the case when there is enough space to store the vertices,
// but the free space is not continous we should defragment the container
if( !defragmentResize( m_currentSize ) )
return false;
// Update the current offset
m_chunkOffset = m_item->GetOffset();
// We can take the first free chunk, as there is only one after defragmentation
// and we can be sure that it provides enough space to store the object
newChunk = m_freeChunks.begin();
}
assert( newChunk != m_freeChunks.end() );
// Parameters of the allocated chunk
unsigned int newChunkSize = getChunkSize( *newChunk );
@ -420,7 +406,7 @@ bool CACHED_CONTAINER::defragmentResize( unsigned int aNewSize )
wxT( "Resizing & defragmenting container from %d to %d" ), m_currentSize, aNewSize );
// No shrinking if we cannot fit all the data
if( aNewSize < m_currentSize && usedSpace() > aNewSize )
if( usedSpace() > aNewSize )
return false;
#ifdef __WXDEBUG__
@ -447,21 +433,10 @@ bool CACHED_CONTAINER::defragmentResize( unsigned int aNewSize )
glBufferData( GL_ELEMENT_ARRAY_BUFFER, aNewSize * VertexSize, NULL, GL_DYNAMIC_DRAW );
checkGlError( "creating buffer during defragmentation" );
// Special case: the container is either already defragmented or filled up to its capacity,
// so we just resize it and move the current data
if( ( m_freeChunks.size() == 0 )
|| ( m_freeChunks.size() == 1 && m_freeChunks.begin()->second == usedSpace() ) )
{
assert( aNewSize != m_currentSize );
glCopyBufferSubData( GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
0, 0, usedSpace() * VertexSize );
}
else
{
int newOffset = 0;
ITEMS::iterator it, it_end;
int newOffset = 0;
// Defragmentation
for( it = m_items.begin(), it_end = m_items.end(); it != it_end; ++it )
{
VERTEX_ITEM* item = *it;
@ -478,6 +453,16 @@ bool CACHED_CONTAINER::defragmentResize( unsigned int aNewSize )
// Move to the next free space
newOffset += itemSize;
}
// Move the current item and place it at the end
if( m_item->GetSize() > 0 )
{
glCopyBufferSubData( GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
m_item->GetOffset() * VertexSize, newOffset * VertexSize,
m_item->GetSize() * VertexSize );
m_item->setOffset( newOffset );
m_chunkOffset = newOffset;
}
// Cleanup
@ -547,16 +532,7 @@ bool CACHED_CONTAINER::defragmentResizeMemcpy( unsigned int aNewSize )
newBufferMem = static_cast<VERTEX*>( glMapBuffer( GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY ) );
checkGlError( "creating buffer during defragmentation" );
// Special case: the container is either already defragmented or filled up to its capacity,
// so we just resize it and move the current data
if( ( m_freeChunks.size() == 0 )
|| ( m_freeChunks.size() == 1 && m_freeChunks.begin()->second == usedSpace() ) )
{
assert( aNewSize != m_currentSize );
memcpy( newBufferMem, m_vertices, usedSpace() * VertexSize );
}
else
{
// Defragmentation
ITEMS::iterator it, it_end;
int newOffset = 0;
@ -575,6 +551,14 @@ bool CACHED_CONTAINER::defragmentResizeMemcpy( unsigned int aNewSize )
// Move to the next free space
newOffset += itemSize;
}
// Move the current item and place it at the end
if( m_item->GetSize() > 0 )
{
memcpy( &newBufferMem[newOffset], &m_vertices[m_item->GetOffset()],
m_item->GetSize() * VertexSize );
m_item->setOffset( newOffset );
m_chunkOffset = newOffset;
}
// Cleanup