1 files changed, 96 insertions, 0 deletions
diff --git a/tier0/mem.cpp b/tier0/mem.cpp
new file mode 100644
index 0000000..3e716d5
--- /dev/null
+++ b/tier0/mem.cpp
@@ -0,0 +1,96 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Memory allocation!
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "pch_tier0.h"
+#include "tier0/mem.h"
+#include <malloc.h>
+#include "tier0/dbg.h"
+#include "tier0/minidump.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+#ifndef STEAM
+#define PvRealloc realloc
+#define PvAlloc malloc
+#define PvExpand _expand
+#endif
+
+enum 
+{
+	MAX_STACK_DEPTH = 32
+};
+
+static uint8 *s_pBuf = NULL;
+static int s_pBufStackDepth[MAX_STACK_DEPTH];
+static int s_nBufDepth = -1;
+static int s_nBufCurSize = 0;
+static int s_nBufAllocSize = 0;
+static bool s_oomerror_called = false;
+
+void MemAllocOOMError( size_t nSize )
+{
+	if ( !s_oomerror_called )
+	{
+		s_oomerror_called = true;
+
+		MinidumpUserStreamInfoAppend( "MemAllocOOMError: %u bytes\n", (uint)nSize );
+
+		//$ TODO: Need a good error message here.
+		// A basic advice to try lowering texture settings is just most-likely to help users who are exhausting address
+		// space, but not necessarily the cause.  Ideally the engine wouldn't let you get here because of too-high settings.
+		Error( "Out of memory or address space.  Texture quality setting may be too high.\n" );
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Other DLL-exported methods for particular kinds of memory
+//-----------------------------------------------------------------------------
+void *MemAllocScratch( int nMemSize )
+{	
+	// Minimally allocate 1M scratch
+	if (s_nBufAllocSize < s_nBufCurSize + nMemSize)
+	{
+		s_nBufAllocSize = s_nBufCurSize + nMemSize;
+		if (s_nBufAllocSize < 1024 * 1024)
+		{
+			s_nBufAllocSize = 1024 * 1024;
+		}
+
+		if (s_pBuf)
+		{
+			s_pBuf = (uint8*)PvRealloc( s_pBuf, s_nBufAllocSize );
+			Assert( s_pBuf );	
+		}
+		else
+		{
+			s_pBuf = (uint8*)PvAlloc( s_nBufAllocSize );
+		}
+	}
+
+	int nBase = s_nBufCurSize;
+	s_nBufCurSize += nMemSize;
+	++s_nBufDepth;
+	Assert( s_nBufDepth < MAX_STACK_DEPTH );
+	s_pBufStackDepth[s_nBufDepth] = nMemSize;
+
+	return &s_pBuf[nBase];
+}
+
+void MemFreeScratch()
+{
+	Assert( s_nBufDepth >= 0 );
+	s_nBufCurSize -= s_pBufStackDepth[s_nBufDepth];
+	--s_nBufDepth;
+}
+
+#ifdef POSIX
+void ZeroMemory( void *mem, size_t length )
+{
+	memset( mem, 0x0, length );
+}
+#endif