1 files changed, 116 insertions, 0 deletions
diff --git a/thirdparty/bullet/src/LinearMath/btStackAlloc.h b/thirdparty/bullet/src/LinearMath/btStackAlloc.h
new file mode 100644
index 0000000000..397b084877
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+++ b/thirdparty/bullet/src/LinearMath/btStackAlloc.h
@@ -0,0 +1,116 @@
+/*
+Copyright (c) 2003-2006 Gino van den Bergen / Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+/*
+StackAlloc extracted from GJK-EPA collision solver by Nathanael Presson
+Nov.2006
+*/
+
+#ifndef BT_STACK_ALLOC
+#define BT_STACK_ALLOC
+
+#include "btScalar.h" //for btAssert
+#include "btAlignedAllocator.h"
+
+///The btBlock class is an internal structure for the btStackAlloc memory allocator.
+struct btBlock
+{
+	btBlock*			previous;
+	unsigned char*		address;
+};
+
+///The StackAlloc class provides some fast stack-based memory allocator (LIFO last-in first-out)
+class btStackAlloc
+{
+public:
+
+	btStackAlloc(unsigned int size)	{ ctor();create(size); }
+	~btStackAlloc()		{ destroy(); }
+	
+	inline void		create(unsigned int size)
+	{
+		destroy();
+		data		=  (unsigned char*) btAlignedAlloc(size,16);
+		totalsize	=	size;
+	}
+	inline void		destroy()
+	{
+		btAssert(usedsize==0);
+		//Raise(L"StackAlloc is still in use");
+
+		if(usedsize==0)
+		{
+			if(!ischild && data)		
+				btAlignedFree(data);
+
+			data				=	0;
+			usedsize			=	0;
+		}
+		
+	}
+
+	int	getAvailableMemory() const
+	{
+		return static_cast<int>(totalsize - usedsize);
+	}
+
+	unsigned char*			allocate(unsigned int size)
+	{
+		const unsigned int	nus(usedsize+size);
+		if(nus<totalsize)
+		{
+			usedsize=nus;
+			return(data+(usedsize-size));
+		}
+		btAssert(0);
+		//&& (L"Not enough memory"));
+		
+		return(0);
+	}
+	SIMD_FORCE_INLINE btBlock*		beginBlock()
+	{
+		btBlock*	pb = (btBlock*)allocate(sizeof(btBlock));
+		pb->previous	=	current;
+		pb->address		=	data+usedsize;
+		current			=	pb;
+		return(pb);
+	}
+	SIMD_FORCE_INLINE void		endBlock(btBlock* block)
+	{
+		btAssert(block==current);
+		//Raise(L"Unmatched blocks");
+		if(block==current)
+		{
+			current		=	block->previous;
+			usedsize	=	(unsigned int)((block->address-data)-sizeof(btBlock));
+		}
+	}
+
+private:
+	void		ctor()
+	{
+		data		=	0;
+		totalsize	=	0;
+		usedsize	=	0;
+		current		=	0;
+		ischild		=	false;
+	}
+	unsigned char*		data;
+	unsigned int		totalsize;
+	unsigned int		usedsize;
+	btBlock*	current;
+	bool		ischild;
+};
+
+#endif //BT_STACK_ALLOC