481 lines
18 KiB
C++
481 lines
18 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: See gpubufferallocator.h
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//
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// $NoKeywords: $
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//
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//===========================================================================//
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#include "gpubufferallocator.h"
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#include "dynamicvb.h"
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#include "dynamicib.h"
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// NOTE: This has to be the last file included!
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#include "tier0/memdbgon.h"
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#if defined( _X360 )
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//-----------------------------------------------------------------------------
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// globals
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//-----------------------------------------------------------------------------
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#include "utlmap.h"
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MEMALLOC_DEFINE_EXTERNAL_TRACKING( XMem_CGPUBufferPool );
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// Track non-pooled VB/IB physical allocations (used by CGPUBufferAllocator::SpewStats)
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CInterlockedInt g_NumIndividualVBPhysAllocs = 0;
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CInterlockedInt g_SizeIndividualVBPhysAllocs = 0;
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CInterlockedInt g_NumIndividualIBPhysAllocs = 0;
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CInterlockedInt g_SizeIndividualIBPhysAllocs = 0;
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//=============================================================================
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//=============================================================================
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// CGPUBufferAllocator
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//=============================================================================
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//=============================================================================
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CGPUBufferAllocator::CGPUBufferAllocator( void )
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: m_nBufferPools( 0 ),
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m_bEnabled( true )
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{
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memset( &( m_BufferPools[ 0 ] ), 0, sizeof( m_BufferPools ) );
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m_bEnabled = USE_GPU_BUFFER_ALLOCATOR && !CommandLine()->FindParm( "-no_gpu_buffer_allocator" );
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if ( m_bEnabled )
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{
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// Start with one pool (the size should be the lowest-common-denominator for all maps)
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AllocatePool( INITIAL_POOL_SIZE );
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}
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}
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CGPUBufferAllocator::~CGPUBufferAllocator( void )
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{
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for ( int i = 0; i < m_nBufferPools; i++ )
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{
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delete m_BufferPools[ i ];
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}
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}
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//-----------------------------------------------------------------------------
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// Allocate a new memory pool
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//-----------------------------------------------------------------------------
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bool CGPUBufferAllocator::AllocatePool( int nPoolSize )
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{
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if ( m_nBufferPools == MAX_POOLS )
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return false;
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m_BufferPools[ m_nBufferPools ] = new CGPUBufferPool( nPoolSize );
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if ( m_BufferPools[ m_nBufferPools ]->m_pMemory == NULL )
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{
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// Physical alloc failed! Continue without crashing, we *might* get away with it...
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ExecuteOnce( DebuggerBreakIfDebugging() );
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ExecuteNTimes( 15, Warning( "CGPUBufferAllocator::AllocatePool - physical allocation failed! Physical fragmentation is in bad shape... falling back to non-pooled VB/IB allocations. Brace for a crash :o/\n" ) );
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delete m_BufferPools[ m_nBufferPools ];
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m_BufferPools[ m_nBufferPools ] = NULL;
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return false;
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}
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m_nBufferPools++;
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return true;
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}
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//-----------------------------------------------------------------------------
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// Make a new GPUBufferHandle_t to represent a given buffer allocation
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//-----------------------------------------------------------------------------
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inline GPUBufferHandle_t CGPUBufferAllocator::MakeGPUBufferHandle( int nPoolNum, int nPoolEntry )
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{
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GPUBufferHandle_t newHandle;
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newHandle.nPoolNum = nPoolNum;
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newHandle.nPoolEntry = nPoolEntry;
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newHandle.pMemory = m_BufferPools[ nPoolNum ]->m_pMemory + m_BufferPools[ nPoolNum ]->m_PoolEntries[ nPoolEntry ].nOffset;
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return newHandle;
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}
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//-----------------------------------------------------------------------------
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// Try to allocate a block of the given size from one of our pools
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//-----------------------------------------------------------------------------
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bool CGPUBufferAllocator::AllocateBuffer( GPUBufferHandle_t *pHandle, int nBufferSize, void *pObject, bool bIsVertexBuffer )
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{
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if ( m_bEnabled && ( nBufferSize <= MAX_BUFFER_SIZE ) )
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{
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// Try to allocate at the end of one of our pools
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for ( int nPool = 0; nPool < m_nBufferPools; nPool++ )
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{
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int nPoolEntry = m_BufferPools[ nPool ]->Allocate( nBufferSize, bIsVertexBuffer, pObject );
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if ( nPoolEntry >= 0 )
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{
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// Tada.
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*pHandle = MakeGPUBufferHandle( nPool, nPoolEntry );
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return true;
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}
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if ( nPool == ( m_nBufferPools - 1 ) )
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{
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// Allocate a new pool (in which this buffer should DEFINITELY fit!)
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COMPILE_TIME_ASSERT( ADDITIONAL_POOL_SIZE >= MAX_BUFFER_SIZE );
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AllocatePool( ADDITIONAL_POOL_SIZE );
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}
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}
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}
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return false;
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}
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//-----------------------------------------------------------------------------
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// Clear the given allocation from our pools (NOTE: the memory cannot be reused until Defrag() is called)
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//-----------------------------------------------------------------------------
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void CGPUBufferAllocator::DeallocateBuffer( const GPUBufferHandle_t *pHandle )
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{
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Assert( pHandle );
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if ( pHandle )
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{
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Assert( ( pHandle->nPoolNum >= 0 ) && ( pHandle->nPoolNum < m_nBufferPools ) );
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if ( ( pHandle->nPoolNum >= 0 ) && ( pHandle->nPoolNum < m_nBufferPools ) )
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{
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m_BufferPools[ pHandle->nPoolNum ]->Deallocate( pHandle );
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}
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}
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}
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//-----------------------------------------------------------------------------
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// If appropriate, allocate this VB's memory from one of our pools
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//-----------------------------------------------------------------------------
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bool CGPUBufferAllocator::AllocateVertexBuffer( CVertexBuffer *pVertexBuffer, int nBufferSize )
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{
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AUTO_LOCK( m_mutex );
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bool bIsVertexBuffer = true;
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GPUBufferHandle_t handle;
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if ( AllocateBuffer( &handle, nBufferSize, (void *)pVertexBuffer, bIsVertexBuffer ) )
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{
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// Success - give the VB the handle to this allocation
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pVertexBuffer->SetBufferAllocationHandle( handle );
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return true;
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}
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return false;
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}
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//-----------------------------------------------------------------------------
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// Deallocate this VB's memory from our pools
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//-----------------------------------------------------------------------------
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void CGPUBufferAllocator::DeallocateVertexBuffer( CVertexBuffer *pVertexBuffer )
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{
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AUTO_LOCK( m_mutex );
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// Remove the allocation from the pool and clear the VB's handle
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DeallocateBuffer( pVertexBuffer->GetBufferAllocationHandle() );
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pVertexBuffer->SetBufferAllocationHandle( GPUBufferHandle_t() );
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}
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//-----------------------------------------------------------------------------
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// If appropriate, allocate this IB's memory from one of our pools
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//-----------------------------------------------------------------------------
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bool CGPUBufferAllocator::AllocateIndexBuffer( CIndexBuffer *pIndexBuffer, int nBufferSize )
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{
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AUTO_LOCK( m_mutex );
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bool bIsNOTVertexBuffer = false;
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GPUBufferHandle_t handle;
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if ( AllocateBuffer( &handle, nBufferSize, (void *)pIndexBuffer, bIsNOTVertexBuffer ) )
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{
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// Success - give the IB the handle to this allocation
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pIndexBuffer->SetBufferAllocationHandle( handle );
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return true;
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}
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return false;
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}
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//-----------------------------------------------------------------------------
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// Deallocate this IB's memory from our pools
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//-----------------------------------------------------------------------------
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void CGPUBufferAllocator::DeallocateIndexBuffer( CIndexBuffer *pIndexBuffer )
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{
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AUTO_LOCK( m_mutex );
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// Remove the allocation from the pool and clear the IB's handle
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DeallocateBuffer( pIndexBuffer->GetBufferAllocationHandle() );
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pIndexBuffer->SetBufferAllocationHandle( GPUBufferHandle_t() );
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}
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//-----------------------------------------------------------------------------
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// Move a buffer from one location to another (could be movement within the same pool)
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//-----------------------------------------------------------------------------
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void CGPUBufferAllocator::MoveBufferMemory( int nDstPool, int *pnDstEntry, int *pnDstOffset, CGPUBufferPool &srcPool, GPUBufferPoolEntry_t &srcEntry )
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{
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// Move the data
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CGPUBufferPool &dstPool = *m_BufferPools[ nDstPool ];
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byte *pDest = dstPool.m_pMemory + *pnDstOffset;
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byte *pSource = srcPool.m_pMemory + srcEntry.nOffset;
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if ( pDest != pSource )
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V_memmove( pDest, pSource, srcEntry.nSize );
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// Update the destination pool's allocation entry (NOTE: this could be srcEntry, so srcEntry.nOffset would change)
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dstPool.m_PoolEntries[ *pnDstEntry ] = srcEntry;
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dstPool.m_PoolEntries[ *pnDstEntry ].nOffset = *pnDstOffset;
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// Tell the VB/IB about the updated allocation
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GPUBufferHandle_t newHandle = MakeGPUBufferHandle( nDstPool, *pnDstEntry );
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if ( srcEntry.bIsVertexBuffer )
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srcEntry.pVertexBuffer->SetBufferAllocationHandle( newHandle );
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else
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srcEntry.pIndexBuffer->SetBufferAllocationHandle( newHandle );
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// Move the write address past this entry and increment the pool high water mark
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*pnDstOffset += srcEntry.nSize;
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*pnDstEntry += 1;
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dstPool.m_nBytesUsed += srcEntry.nSize;
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}
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//-----------------------------------------------------------------------------
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// Reclaim space freed by destroyed buffers and compact our pools ready for new allocations
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//-----------------------------------------------------------------------------
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void CGPUBufferAllocator::Compact( void )
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{
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// NOTE: this must only be called during map transitions, no rendering must be in flight and everything must be single-threaded!
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AUTO_LOCK( m_mutex );
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// SpewStats(); // pre-compact state
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CFastTimer timer;
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timer.Start();
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// Shuffle all pools to get rid of the empty space occupied by freed buffers.
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// We just walk the pools and entries in order, moving each buffer down within the same pool,
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// or to the end of a previous pool (if, after compaction, it now has free space).
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// Each pool should end up with contiguous, usable free space (may be zero bytes) at the end.
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int nDstPool = 0, nDstEntry = 0, nDstOffset = 0;
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for ( int nSrcPool = 0; nSrcPool < m_nBufferPools; nSrcPool++ )
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{
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CGPUBufferPool &srcPool = *m_BufferPools[ nSrcPool ];
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srcPool.m_nBytesUsed = 0; // Re-fill each pool from scratch
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int nEntriesRemainingInPool = 0;
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for ( int nSrcEntry = 0; nSrcEntry < srcPool.m_PoolEntries.Count(); nSrcEntry++ )
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{
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GPUBufferPoolEntry_t &srcEntry = srcPool.m_PoolEntries[ nSrcEntry ];
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if ( srcEntry.pVertexBuffer )
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{
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// First, try to move the buffer into one of the previous (already-compacted) pools
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bool bDone = false;
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while ( nDstPool < nSrcPool )
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{
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CGPUBufferPool &dstPool = *m_BufferPools[ nDstPool ];
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if ( ( nDstOffset + srcEntry.nSize ) <= dstPool.m_nSize )
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{
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// Add this buffer to the end of dstPool
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Assert( nDstEntry == dstPool.m_PoolEntries.Count() );
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dstPool.m_PoolEntries.AddToTail();
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MoveBufferMemory( nDstPool, &nDstEntry, &nDstOffset, srcPool, srcEntry );
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bDone = true;
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break;
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}
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else
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{
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// This pool is full, start writing into the next one
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nDstPool++;
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nDstEntry = 0;
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nDstOffset = 0;
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}
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}
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// If that fails, just shuffle the entry down within srcPool
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if ( !bDone )
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{
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Assert( nSrcPool == nDstPool );
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MoveBufferMemory( nDstPool, &nDstEntry, &nDstOffset, srcPool, srcEntry );
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nEntriesRemainingInPool++;
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}
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}
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}
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// Discard unused entries from the end of the pool (freed buffers, or buffers moved to other pools)
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srcPool.m_PoolEntries.SetCountNonDestructively( nEntriesRemainingInPool );
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}
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// Now free empty pools (keep the first (very large) one around, since fragmentation makes freeing+reallocing it a big risk)
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int nBytesFreed = 0;
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for ( int nPool = ( m_nBufferPools - 1 ); nPool > 0; nPool-- )
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{
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if ( m_BufferPools[ nPool ]->m_PoolEntries.Count() )
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break;
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nBytesFreed += m_BufferPools[ nPool ]->m_nSize;
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Assert( m_BufferPools[ nPool ]->m_nBytesUsed == 0 );
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delete m_BufferPools[ nPool ];
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m_nBufferPools--;
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}
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if ( m_nBufferPools > 1 )
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{
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// The above compaction algorithm could waste space due to large allocs causing nDstPool to increment before that pool
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// is actually full. With our current usage pattern (total in-use memory is less than INITIAL_POOL_SIZE, whenever Compact
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// is called), that doesn't matter. If that changes (i.e. the below warning fires), then the fix would be:
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// - for each pool, sort its entries by size (largest first) and try to allocate them on the end of prior (already-compacted) pools
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// - pack whatever remains in the pool down, and proceed to the next pool
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ExecuteOnce( Warning( "CGPUBufferAllocator::Compact may be wasting memory due to changed usage patterns (see code for suggested fix)." ) );
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}
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#ifdef _X360
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// Invalidate the GPU caches for all pooled memory, since stuff has moved around
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for ( int nPool = 0; nPool < m_nBufferPools; nPool++ )
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{
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Dx9Device()->InvalidateGpuCache( m_BufferPools[ nPool ]->m_pMemory, m_BufferPools[ nPool ]->m_nSize, 0 );
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}
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#endif
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timer.End();
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float compactTime = (float)timer.GetDuration().GetSeconds();
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Msg( "CGPUBufferAllocator::Compact took %.2f seconds, and freed %.1fkb\n", compactTime, ( nBytesFreed / 1024.0f ) );
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// SpewStats(); // post-compact state
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}
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//-----------------------------------------------------------------------------
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// Spew statistics about pool usage, so we can tune our constant values
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//-----------------------------------------------------------------------------
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void CGPUBufferAllocator::SpewStats( bool bBrief )
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{
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AUTO_LOCK( m_mutex );
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int nMemAllocated = 0;
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int nMemUsed = 0;
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int nOldMemWasted = 0;
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int nVBsInPools = 0;
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int nIBsInPools = 0;
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int nFreedBuffers = 0;
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int nFreedBufferMem = 0;
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for ( int i = 0; i < m_nBufferPools; i++ )
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{
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CGPUBufferPool *pool = m_BufferPools[ i ];
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nMemAllocated += pool->m_nSize;
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nMemUsed += pool->m_nBytesUsed;
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for ( int j = 0; j < pool->m_PoolEntries.Count(); j++ )
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{
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GPUBufferPoolEntry_t &poolEntry = pool->m_PoolEntries[ j ];
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if ( poolEntry.pVertexBuffer )
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{
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// Figure out how much memory we WOULD have allocated for this buffer, if we'd allocated it individually:
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nOldMemWasted += ALIGN_VALUE( poolEntry.nSize, 4096 ) - poolEntry.nSize;
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if ( poolEntry.bIsVertexBuffer ) nVBsInPools++;
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if ( !poolEntry.bIsVertexBuffer ) nIBsInPools++;
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}
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else
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{
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nFreedBuffers++;
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nFreedBufferMem += poolEntry.nSize;
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}
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}
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}
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// NOTE: 'unused' memory doesn't count memory used by freed buffers, which should be zero during gameplay. The purpose is
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// to measure wastage at the END of a pool, to help determine ideal values for ADDITIONAL_POOL_SIZE and MAX_BUFFER_SIZE.
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int nMemUnused = nMemAllocated - nMemUsed;
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const float KB = 1024.0f, MB = KB*KB;
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if ( bBrief )
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{
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ConMsg( "[GPUBUFLOG] Pools:%2d | Size:%5.1fMB | Unused:%5.1fMB | Freed:%5.1fMB | Unpooled:%5.1fMB\n",
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m_nBufferPools, nMemAllocated / MB, nMemUnused / MB, nFreedBufferMem / MB, ( g_SizeIndividualVBPhysAllocs + g_SizeIndividualIBPhysAllocs ) / MB );
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}
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else
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{
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Msg( "\nGPU Buffer Allocator stats:\n" );
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Msg( " -- %5d -- Num Pools allocated\n", m_nBufferPools );
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Msg( " -- %7.1fMB -- Memory allocated to pools\n", nMemAllocated / MB );
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Msg( " -- %7.1fkb -- Unused memory at tail-end of pools\n", nMemUnused / KB );
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Msg( " -- %7.1fkb -- Memory saved by allocating buffers from pools\n", nOldMemWasted / KB );
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Msg( " -- %5d -- Number of VBs allocated from pools\n", nVBsInPools );
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Msg( " -- %5d -- Number of IBs allocated from pools\n", nIBsInPools );
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Msg( " -- %5d -- Number of freed buffers in pools (should be zero during gameplay)\n", nFreedBuffers );
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Msg( " -- %7.1fkb -- Memory used by freed buffers in pools\n", nFreedBufferMem / KB );
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Msg( " -- %7.1fkb -- Mem allocated for NON-pooled VBs (%d VBs)\n", g_SizeIndividualVBPhysAllocs / KB, g_NumIndividualVBPhysAllocs );
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Msg( " -- %7.1fkb -- Mem allocated for NON-pooled IBs (%d IBs)\n", g_SizeIndividualIBPhysAllocs / KB, g_NumIndividualVBPhysAllocs );
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Msg( "\n" );
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}
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}
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//=============================================================================
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//=============================================================================
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// CGPUBufferPool
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//=============================================================================
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//=============================================================================
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CGPUBufferPool::CGPUBufferPool( int nSize )
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: m_PoolEntries( POOL_ENTRIES_GROW_SIZE, POOL_ENTRIES_INIT_SIZE ),
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m_nSize( 0 ),
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m_nBytesUsed( 0 )
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{
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// NOTE: write-combining (PAGE_WRITECOMBINE) is deliberately not used, since it slows down 'Compact' hugely (and doesn't noticeably benefit load times)
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m_pMemory = (byte*)XPhysicalAlloc( nSize, MAXULONG_PTR, 0, PAGE_READWRITE );
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if ( m_pMemory )
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{
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MemAlloc_RegisterExternalAllocation( XMem_CGPUBufferPool, m_pMemory, XPhysicalSize( m_pMemory ) );
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m_nSize = nSize;
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}
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}
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CGPUBufferPool::~CGPUBufferPool( void )
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{
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for ( int i = 0; i < m_PoolEntries.Count(); i++ )
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{
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if ( m_PoolEntries[ i ].pVertexBuffer )
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{
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// Buffers should be cleaned up before the CGPUBufferAllocator is shut down!
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Assert( 0 );
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Warning( "ERROR: Un-freed %s in CGPUBufferPool on shut down! (%6.1fKB\n",
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( m_PoolEntries[ i ].bIsVertexBuffer ? "VB" : "IB" ), ( m_PoolEntries[ i ].nSize / 1024.0f ) );
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break;
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}
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}
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if ( m_pMemory )
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{
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MemAlloc_RegisterExternalDeallocation( XMem_CGPUBufferPool, m_pMemory, XPhysicalSize( m_pMemory ) );
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XPhysicalFree( m_pMemory );
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m_pMemory = 0;
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}
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m_nSize = m_nBytesUsed = 0;
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}
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//-----------------------------------------------------------------------------
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// Attempt to allocate a buffer of the given size in this pool
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//-----------------------------------------------------------------------------
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int CGPUBufferPool::Allocate( int nBufferSize, bool bIsVertexBuffer, void *pObject )
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{
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// Align the buffer size
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nBufferSize = ALIGN_VALUE( nBufferSize, POOL_ENTRY_ALIGNMENT );
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// Check available space
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if ( ( m_nBytesUsed + nBufferSize ) > m_nSize )
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return -1;
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int nPoolEntry = m_PoolEntries.AddToTail();
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GPUBufferPoolEntry_t &poolEntry = m_PoolEntries[ nPoolEntry ];
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poolEntry.nOffset = m_nBytesUsed;
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poolEntry.nSize = nBufferSize;
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poolEntry.bIsVertexBuffer = bIsVertexBuffer;
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poolEntry.pVertexBuffer = (CVertexBuffer *)pObject;
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// Update 'used space' high watermark
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m_nBytesUsed += nBufferSize;
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return nPoolEntry;
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}
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//-----------------------------------------------------------------------------
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// Deallocate the given entry from this pool
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//-----------------------------------------------------------------------------
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void CGPUBufferPool::Deallocate( const GPUBufferHandle_t *pHandle )
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{
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Assert( m_PoolEntries.IsValidIndex( pHandle->nPoolEntry ) );
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if ( m_PoolEntries.IsValidIndex( pHandle->nPoolEntry ) )
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{
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Assert( m_PoolEntries[ pHandle->nPoolEntry ].pVertexBuffer );
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m_PoolEntries[ pHandle->nPoolEntry ].pVertexBuffer = NULL;
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}
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}
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#endif // _X360
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