6 files changed, 846 insertions, 42 deletions

diff --git a/src/rw/MemoryHeap.cpp b/src/rw/MemoryHeap.cpp
new file mode 100644
index 00000000..45dd1fc2
--- /dev/null
+++ b/src/rw/MemoryHeap.cpp
@@ -0,0 +1,499 @@
+#include "common.h"
+#include "main.h"
+#include "FileMgr.h"
+#include "Timer.h"
+#include "ModelInfo.h"
+#include "Streaming.h"
+#include "FileLoader.h"
+#include "MemoryHeap.h"
+
+// TODO(MIAMI)
+
+#ifdef USE_CUSTOM_ALLOCATOR
+
+//#define MEMORYHEAP_ASSERT(cond) { if (!(cond)) { printf("ASSERT File:%s Line:%d\n", __FILE__, __LINE__); exit(1); } }
+//#define MEMORYHEAP_ASSERT_MESSAGE(cond, message) { if (!(cond)) { printf("ASSERT File:%s Line:%d:\n\t%s\n", __FILE__, __LINE__, message); exit(1); } }
+
+#define MEMORYHEAP_ASSERT(cond) assert(cond)
+#define MEMORYHEAP_ASSERT_MESSAGE(cond, message) assert(cond)
+
+// registered pointers that we keep track of
+void **gPtrList[4000];
+int32 numPtrs;
+int32 gPosnInList;
+// indices into the ptr list in here are free
+CStack<int32, 4000> m_ptrListIndexStack;
+// how much memory we've moved
+uint32 memMoved;
+
+CMemoryHeap gMainHeap;
+
+void
+CMemoryHeap::Init(uint32 total)
+{
+	MEMORYHEAP_ASSERT((total != 0xF) != 0);
+
+	m_totalMemUsed = 0;
+	m_memUsed = nil;
+	m_currentMemID = MEMID_FREE;
+	m_blocksUsed = nil;
+	m_totalBlocksUsed = 0;
+	m_unkMemId = -1;
+
+	uint8 *mem = (uint8*)malloc(total);
+	assert(((uintptr)mem & 0xF) == 0);
+	m_start = (HeapBlockDesc*)mem;
+	m_end = (HeapBlockDesc*)(mem + total - sizeof(HeapBlockDesc));
+	m_start->m_memId = MEMID_FREE;
+	m_start->m_size = total - 2*sizeof(HeapBlockDesc);
+	m_end->m_memId = MEMID_GAME;
+	m_end->m_size = 0;
+
+	m_freeList.m_last.m_size = INT_MAX;
+	m_freeList.Init();
+	m_freeList.Insert(m_start);
+
+	// TODO: figure out what these are and use sizeof
+	m_fixedSize[0].Init(0x10);
+	m_fixedSize[1].Init(0x20);
+	m_fixedSize[2].Init(0xE0);
+	m_fixedSize[3].Init(0x60);
+	m_fixedSize[4].Init(0x1C0);
+	m_fixedSize[5].Init(0x50);
+
+	m_currentMemID = MEMID_FREE;	// disable registration
+	m_memUsed = (uint32*)Malloc(NUM_MEMIDS * sizeof(uint32));
+	m_blocksUsed = (uint32*)Malloc(NUM_MEMIDS * sizeof(uint32));
+	RegisterMalloc(GetDescFromHeapPointer(m_memUsed));
+	RegisterMalloc(GetDescFromHeapPointer(m_blocksUsed));
+
+	m_currentMemID = MEMID_GAME;
+	for(int i = 0; i < NUM_MEMIDS; i++){
+		m_memUsed[i] = 0;
+		m_blocksUsed[i] = 0;
+	}
+}
+
+void
+CMemoryHeap::RegisterMalloc(HeapBlockDesc *block)
+{
+	block->m_memId = m_currentMemID;
+	if(m_currentMemID == MEMID_FREE)
+		return;
+	m_totalMemUsed += block->m_size + sizeof(HeapBlockDesc);
+	m_memUsed[m_currentMemID] += block->m_size + sizeof(HeapBlockDesc);
+	m_blocksUsed[m_currentMemID]++;
+	m_totalBlocksUsed++;
+}
+
+void
+CMemoryHeap::RegisterFree(HeapBlockDesc *block)
+{
+	if(block->m_memId == MEMID_FREE)
+		return;
+	m_totalMemUsed -= block->m_size + sizeof(HeapBlockDesc);
+	m_memUsed[block->m_memId] -= block->m_size + sizeof(HeapBlockDesc);
+	m_blocksUsed[block->m_memId]--;
+	m_totalBlocksUsed--;
+}
+
+void*
+CMemoryHeap::Malloc(uint32 size)
+{
+	static int recursion = 0;
+
+	// weird way to round up
+	if((size & 0xF) != 0)
+		size = (size&~0xF) + 0x10;
+
+	recursion++;
+
+	// See if we can allocate from one of the fixed-size lists
+	for(int i = 0; i < NUM_FIXED_MEMBLOCKS; i++){
+		CommonSize *list = &m_fixedSize[i];
+		if(m_fixedSize[i].m_size == size){
+			HeapBlockDesc *block = list->Malloc();
+			if(block){
+				RegisterMalloc(block);
+				recursion--;
+				return block->GetDataPointer();
+			}
+			break;
+		}
+	}
+
+	// now try the normal free list
+	HeapBlockDesc *next;
+	for(HeapBlockDesc *block = m_freeList.m_first.m_next;
+	    block != &m_freeList.m_last;
+	    block = next){
+		MEMORYHEAP_ASSERT(block->m_memId == MEMID_FREE);
+		MEMORYHEAP_ASSERT_MESSAGE(block >= m_start && block <= m_end, "Block outside of memory");
+
+		// make sure block has maximum size
+		uint32 initialsize = block->m_size;
+		uint32 blocksize = CombineFreeBlocks(block);
+#ifdef FIX_BUGS
+		// has to be done here because block can be moved
+		next = block->m_next;
+#endif
+		if(initialsize != blocksize){
+			block->RemoveHeapFreeBlock();
+			HeapBlockDesc *pos = block->m_prev->FindSmallestFreeBlock(block->m_size);
+			block->InsertHeapFreeBlock(pos->m_prev);
+		}
+		if(block->m_size >= size){
+			// got space to allocate from!
+			block->RemoveHeapFreeBlock();
+			FillInBlockData(block, block->GetNextConsecutive(), size);
+			recursion--;
+			return block->GetDataPointer();
+		}
+#ifndef FIX_BUGS
+		next = block->m_next;
+#endif
+	}
+
+	// oh no, we're losing, try to free some stuff
+	static bool removeCollision = false;
+	static bool removeIslands = false;
+	static bool removeBigBuildings = false;
+	size_t initialMemoryUsed = CStreaming::ms_memoryUsed;
+	CStreaming::MakeSpaceFor(0xCFE800 - CStreaming::ms_memoryUsed);
+	if (recursion > 10)
+		CGame::TidyUpMemory(true, false);
+	else if (recursion > 6)
+		CGame::TidyUpMemory(false, true);
+	if (initialMemoryUsed == CStreaming::ms_memoryUsed && recursion > 11) {
+		if (!removeCollision && !CGame::playingIntro) {
+			CModelInfo::RemoveColModelsFromOtherLevels(LEVEL_GENERIC);
+			removeCollision = true;
+		}
+		else if (!removeIslands && !CGame::playingIntro) {
+			CStreaming::RemoveIslandsNotUsed(LEVEL_INDUSTRIAL);
+			CStreaming::RemoveIslandsNotUsed(LEVEL_COMMERCIAL);
+			CStreaming::RemoveIslandsNotUsed(LEVEL_SUBURBAN);
+			removeIslands = true;
+		}
+		else if (!removeBigBuildings) {
+			CStreaming::RemoveBigBuildings(LEVEL_INDUSTRIAL);
+			CStreaming::RemoveBigBuildings(LEVEL_COMMERCIAL);
+			CStreaming::RemoveBigBuildings(LEVEL_SUBURBAN);
+		}
+		else {
+			LoadingScreen("NO MORE MEMORY", nil, nil);
+			LoadingScreen("NO MORE MEMORY", nil, nil);
+		}
+		CGame::TidyUpMemory(true, false);
+	}
+	void *mem = Malloc(size);
+	if (removeCollision) {
+		CTimer::Stop();
+		// TODO: different on PS2
+		CFileLoader::LoadCollisionFromDatFile(CCollision::ms_collisionInMemory);
+		removeCollision = false;
+		CTimer::Update();
+	}
+	if (removeBigBuildings || removeIslands) {
+		CTimer::Stop();
+		if (!CGame::playingIntro)
+			CStreaming::RequestBigBuildings(CGame::currLevel);
+		CStreaming::LoadAllRequestedModels(true);
+		removeBigBuildings = false;
+		removeIslands = false;
+		CTimer::Update();
+	}
+	recursion--;
+	return mem;
+}
+
+void*
+CMemoryHeap::Realloc(void *ptr, uint32 size)
+{
+	if(ptr == nil)
+		return Malloc(size);
+
+	// weird way to round up
+	if((size & 0xF) != 0)
+		size = (size&~0xF) + 0x10;
+
+	HeapBlockDesc *block = GetDescFromHeapPointer(ptr);
+
+#ifdef FIX_BUGS
+	// better handling of size < block->m_size
+	if(size == 0){
+		Free(ptr);
+		return nil;
+	}
+	if(block->m_size >= size){
+		// shrink allocated block
+		RegisterFree(block);
+		PushMemId(block->m_memId);
+		FillInBlockData(block, block->GetNextConsecutive(), size);
+		PopMemId();
+		return ptr;
+	}
+#else
+	// not growing. just returning here is a bit cheap though
+	if(block->m_size >= size)
+		return ptr;
+#endif
+
+	// have to grow allocated block
+	HeapBlockDesc *next = block->GetNextConsecutive();
+	MEMORYHEAP_ASSERT_MESSAGE(next >= m_start && next <= m_end, "Block outside of memory");
+	if(next->m_memId == MEMID_FREE){
+		// try to grow the current block
+		// make sure the next free block has maximum size
+		uint32 freespace = CombineFreeBlocks(next);
+		HeapBlockDesc *end = next->GetNextConsecutive();
+		MEMORYHEAP_ASSERT_MESSAGE(end >= m_start && end <= m_end, "Block outside of memory");
+		// why the sizeof here?
+		if(block->m_size + next->m_size + sizeof(HeapBlockDesc) >= size){
+			// enough space to grow
+			next->RemoveHeapFreeBlock();
+			RegisterFree(block);
+			PushMemId(block->m_memId);
+			FillInBlockData(block, next->GetNextConsecutive(), size);
+			PopMemId();
+			return ptr;
+		}
+	}
+
+	// can't grow the existing block, have to get a new one and copy
+	PushMemId(block->m_memId);
+	void *dst = Malloc(size);
+	PopMemId();
+	memcpy(dst, ptr, block->m_size);
+	Free(ptr);
+	return dst;
+}
+
+void
+CMemoryHeap::Free(void *ptr)
+{
+	HeapBlockDesc *block = GetDescFromHeapPointer(ptr);
+	MEMORYHEAP_ASSERT_MESSAGE(block->m_memId != MEMID_FREE, "MemoryHeap corrupt");
+	MEMORYHEAP_ASSERT(m_unkMemId == -1 || m_unkMemId == block->m_memId);
+
+	RegisterFree(block);
+	block->m_memId = MEMID_FREE;
+	CombineFreeBlocks(block);
+	FreeBlock(block);
+	if(block->m_ptrListIndex != -1){
+		int32 idx = block->m_ptrListIndex;
+		gPtrList[idx] = nil;
+		m_ptrListIndexStack.push(idx);
+	}
+	block->m_ptrListIndex = -1;
+}
+
+// allocate 'size' bytes from 'block'
+void
+CMemoryHeap::FillInBlockData(HeapBlockDesc *block, HeapBlockDesc *end, uint32 size)
+{
+	block->m_size = size;
+	block->m_ptrListIndex = -1;
+	HeapBlockDesc *remainder = block->GetNextConsecutive();
+	MEMORYHEAP_ASSERT(remainder <= end);
+
+	if(remainder < end-1){
+		RegisterMalloc(block);
+
+		// can fit another block in the remaining space
+		remainder->m_size = GetSizeBetweenBlocks(remainder, end);
+		remainder->m_memId = MEMID_FREE;
+		MEMORYHEAP_ASSERT(remainder->m_size != 0);
+		FreeBlock(remainder);
+	}else{
+		// fully allocate this one
+		if(remainder < end)
+			// no gaps allowed
+			block->m_size = GetSizeBetweenBlocks(block, end);
+		RegisterMalloc(block);
+	}
+}
+
+// Make sure free block has no other free blocks after it
+uint32
+CMemoryHeap::CombineFreeBlocks(HeapBlockDesc *block)
+{
+	HeapBlockDesc *next = block->GetNextConsecutive();
+	if(next->m_memId != MEMID_FREE)
+		return block->m_size;
+	// get rid of free blocks after this one and adjust size
+	for(; next->m_memId == MEMID_FREE; next = next->GetNextConsecutive())
+		next->RemoveHeapFreeBlock();
+	block->m_size = GetSizeBetweenBlocks(block, next);
+	return block->m_size;
+}
+
+// Try to move all registered memory blocks into more optimal location
+void
+CMemoryHeap::TidyHeap(void)
+{
+	for(int i = 0; i < numPtrs; i++){
+		if(gPtrList[i] == nil || *gPtrList[i] == nil)
+			continue;
+		HeapBlockDesc *newblock = WhereShouldMemoryMove(*gPtrList[i]);
+		if(newblock)
+			*gPtrList[i] = MoveHeapBlock(newblock, GetDescFromHeapPointer(*gPtrList[i]));
+	}
+}
+
+// 
+void
+CMemoryHeap::RegisterMemPointer(void *ptr)
+{
+	HeapBlockDesc *block = GetDescFromHeapPointer(*(void**)ptr);
+
+	if(block->m_ptrListIndex != -1)
+		return;		// already registered
+
+	int index;
+	if(m_ptrListIndexStack.sp > 0){
+		// re-use a previously free'd index
+		index = m_ptrListIndexStack.pop();
+	}else{
+		// have to find a new index
+		index = gPosnInList;
+
+		void **pp = gPtrList[index];
+		// we're replacing an old pointer here??
+		if(pp && *pp && *pp != (void*)0xDDDDDDDD)
+			GetDescFromHeapPointer(*pp)->m_ptrListIndex = -1;
+
+		gPosnInList++;
+		if(gPosnInList == 4000)
+			gPosnInList = 0;
+		if(numPtrs < 4000)
+			numPtrs++;
+	}
+	gPtrList[index] = (void**)ptr;
+	block->m_ptrListIndex = index;
+}
+
+void*
+CMemoryHeap::MoveMemory(void *ptr)
+{
+	HeapBlockDesc *newblock = WhereShouldMemoryMove(ptr);
+	if(newblock)
+		return MoveHeapBlock(newblock, GetDescFromHeapPointer(ptr));
+	else
+		return ptr;
+}
+
+HeapBlockDesc*
+CMemoryHeap::WhereShouldMemoryMove(void *ptr)
+{
+	HeapBlockDesc *block = GetDescFromHeapPointer(ptr);
+	MEMORYHEAP_ASSERT(block->m_memId != MEMID_FREE);
+
+	HeapBlockDesc *next = block->GetNextConsecutive();
+	if(next->m_memId != MEMID_FREE)
+		return nil;
+
+	// we want to move the block into another block
+	// such that the free space between this and the next block can be minimized
+	HeapBlockDesc *newblock = m_freeList.m_first.FindSmallestFreeBlock(block->m_size);
+	// size of free space wouldn't decrease, so return
+	if(newblock->m_size >= block->m_size + next->m_size)
+		return nil;
+	// size of free space wouldn't decrease enough
+	if(newblock->m_size >= 16 + 1.125f*block->m_size)	// what are 16 and 1.125 here? sizeof(HeapBlockDesc)?
+		return nil;
+	return newblock;
+}
+
+void*
+CMemoryHeap::MoveHeapBlock(HeapBlockDesc *dst, HeapBlockDesc *src)
+{
+	PushMemId(src->m_memId);
+	dst->RemoveHeapFreeBlock();
+	FillInBlockData(dst, dst->GetNextConsecutive(), src->m_size);
+	PopMemId();
+	memcpy(dst->GetDataPointer(), src->GetDataPointer(), src->m_size);
+	memMoved += src->m_size;
+	dst->m_ptrListIndex = src->m_ptrListIndex;
+	src->m_ptrListIndex = -1;
+	Free(src->GetDataPointer());
+	return dst->GetDataPointer();
+}
+
+uint32
+CMemoryHeap::GetMemoryUsed(int32 id)
+{
+	return m_memUsed[id];
+}
+
+uint32
+CMemoryHeap::GetBlocksUsed(int32 id)
+{
+	return m_blocksUsed[id];
+}
+
+void
+CMemoryHeap::PopMemId(void)
+{
+	assert(m_idStack.sp > 0);
+	m_currentMemID = m_idStack.pop();
+	assert(m_currentMemID != MEMID_FREE);
+}
+
+void
+CMemoryHeap::PushMemId(int32 id)
+{
+	MEMORYHEAP_ASSERT(id != MEMID_FREE);
+	assert(m_idStack.sp < 16);
+	m_idStack.push(m_currentMemID);
+	m_currentMemID = id;
+}
+
+void
+CMemoryHeap::ParseHeap(void)
+{
+	char tmp[16];
+	int fd = CFileMgr::OpenFileForWriting("heap.txt");
+	CTimer::Stop();
+
+	// CMemoryHeap::IntegrityCheck();
+
+	uint32 addrQW = 0;
+	for(HeapBlockDesc *block = m_start; block < m_end; block = block->GetNextConsecutive()){
+		char chr = '*';	// free
+		if(block->m_memId != MEMID_FREE)
+			chr = block->m_memId-1 + 'A';
+		int numQW = block->m_size>>4;
+
+		if((addrQW & 0x3F) == 0){
+			sprintf(tmp, "\n%5dK:", addrQW>>6);
+			CFileMgr::Write(fd, tmp, 8);
+		}
+		CFileMgr::Write(fd, "#", 1);	// the descriptor, has to be 16 bytes!!!!
+		addrQW++;
+
+		while(numQW--){
+			if((addrQW & 0x3F) == 0){
+				sprintf(tmp, "\n%5dK:", addrQW>>6);
+				CFileMgr::Write(fd, tmp, 8);
+			}
+			CFileMgr::Write(fd, &chr, 1);
+			addrQW++;
+		}
+	}
+
+	CTimer::Update();
+	CFileMgr::CloseFile(fd);
+}
+
+
+void
+CommonSize::Init(uint32 size)
+{
+	m_freeList.Init();
+	m_size = size;
+	m_failed = 0;
+	m_remaining = 0;
+}
+
+#endif
diff --git a/src/rw/MemoryHeap.h b/src/rw/MemoryHeap.h
new file mode 100644
index 00000000..38a8ba2b
--- /dev/null
+++ b/src/rw/MemoryHeap.h
@@ -0,0 +1,205 @@
+#pragma once
+
+// some windows shit
+#ifdef MoveMemory
+#undef MoveMemory
+#endif
+
+#ifdef USE_CUSTOM_ALLOCATOR
+#define PUSH_MEMID(id) gMainHeap.PushMemId(id)
+#define POP_MEMID() gMainHeap.PopMemId()
+#define REGISTER_MEMPTR(ptr) gMainHeap.RegisterMemPointer(ptr)
+#else
+#define PUSH_MEMID(id)
+#define POP_MEMID()
+#define REGISTER_MEMPTR(ptr)
+#endif
+
+enum {
+	MEMID_FREE,
+	// IDs from LCS:
+	MEMID_GAME = 1,	// "Game"
+	MEMID_WORLD = 2,	// "World"
+	MEMID_ANIMATION = 3,	// "Animation"
+	MEMID_POOLS = 4,	// "Pools"
+	MEMID_DEF_MODELS = 5,	// "Default Models"
+	MEMID_STREAM = 6,	// "Streaming"
+	MEMID_STREAM_MODELS = 7,	// "Streamed Models"
+	MEMID_STREAM_LODS = 8,	// "Streamed LODs"
+	MEMID_STREAM_TEXUTRES = 9,	// "Streamed Textures"
+	MEMID_STREAM_COLLISION = 10,	// "Streamed Collision"
+	MEMID_STREAM_ANIMATION = 11,	// "Streamed Animation"
+	MEMID_TEXTURES = 12,	// "Textures"
+	MEMID_COLLISION = 13,	// "Collision"
+	MEMID_PRE_ALLOC = 14,	// "PreAlloc"
+	MEMID_GAME_PROCESS = 15,	// "Game Process"
+	MEMID_SCRIPT = 16,	// "Script"
+	MEMID_CARS = 17,	// "Cars"
+	MEMID_RENDER = 18,	// "Render"
+	MEMID_PED_ATTR = 19,	// "Ped Attr"
+	NUM_MEMIDS,
+
+	NUM_FIXED_MEMBLOCKS = 6
+};
+
+template<typename T, uint32 N>
+class CStack
+{
+public:
+	T values[N];
+	uint32 sp;
+
+	CStack() : sp(0) {}
+	void push(const T& val) { values[sp++] = val; }
+	T& pop() { return values[--sp]; }
+};
+
+
+struct HeapBlockDesc
+{
+	uint32 m_size;
+	int16 m_memId;
+	int16 m_ptrListIndex;
+	HeapBlockDesc *m_next;
+	HeapBlockDesc *m_prev;
+
+	HeapBlockDesc *GetNextConsecutive(void)
+	{
+		return (HeapBlockDesc*)((uintptr)this + sizeof(HeapBlockDesc) + m_size);
+	}
+
+	void *GetDataPointer(void)
+	{
+		return (void*)((uintptr)this + sizeof(HeapBlockDesc));
+	}
+
+	void RemoveHeapFreeBlock(void)
+	{
+		m_next->m_prev = m_prev;
+		m_prev->m_next = m_next;
+	}
+
+	// after node
+	void InsertHeapFreeBlock(HeapBlockDesc *node)
+	{
+		m_next = node->m_next;
+		node->m_next->m_prev = this;
+		m_prev = node;
+		node->m_next = this;
+	}
+
+	HeapBlockDesc *FindSmallestFreeBlock(uint32 size)
+	{
+		HeapBlockDesc *b;
+		for(b = m_next; b->m_size < size; b = b->m_next);
+		return b;
+	}
+};
+
+#ifdef USE_CUSTOM_ALLOCATOR
+// TODO: figure something out for 64 bit pointers
+static_assert(sizeof(HeapBlockDesc) == 0x10, "HeapBlockDesc must have 0x10 size otherwise most of assumptions don't make sense");
+#endif
+
+struct HeapBlockList
+{
+	HeapBlockDesc m_first;
+	HeapBlockDesc m_last;
+
+	void Init(void)
+	{
+		m_first.m_next = &m_last;
+		m_last.m_prev = &m_first;
+	}
+
+	void Insert(HeapBlockDesc *node)
+	{
+		node->InsertHeapFreeBlock(&m_first);
+	}
+};
+
+struct CommonSize
+{
+	HeapBlockList m_freeList;
+	uint32 m_size;
+	uint32 m_failed;
+	uint32 m_remaining;
+
+	void Init(uint32 size);
+	void Free(HeapBlockDesc *node)
+	{
+		m_freeList.Insert(node);
+		m_remaining++;
+	}
+	HeapBlockDesc *Malloc(void)
+	{
+		if(m_freeList.m_first.m_next == &m_freeList.m_last){
+			m_failed++;
+			return nil;
+		}
+		HeapBlockDesc *block = m_freeList.m_first.m_next;
+		m_remaining--;
+		block->RemoveHeapFreeBlock();
+		block->m_ptrListIndex = -1;
+		return block;
+	}
+};
+
+class CMemoryHeap
+{
+public:
+	HeapBlockDesc *m_start;
+	HeapBlockDesc *m_end;
+	HeapBlockList m_freeList;
+	CommonSize m_fixedSize[NUM_FIXED_MEMBLOCKS];
+	uint32 m_totalMemUsed;
+	CStack<int32, 16> m_idStack;
+	uint32 m_currentMemID;
+	uint32 *m_memUsed;
+	uint32 m_totalBlocksUsed;
+	uint32 *m_blocksUsed;
+	uint32 m_unkMemId;
+
+	CMemoryHeap(void) : m_start(nil) {}
+	void Init(uint32 total);
+	void RegisterMalloc(HeapBlockDesc *block);
+	void RegisterFree(HeapBlockDesc *block);
+	void *Malloc(uint32 size);
+	void *Realloc(void *ptr, uint32 size);
+	void Free(void *ptr);
+	void FillInBlockData(HeapBlockDesc *block, HeapBlockDesc *end, uint32 size);
+	uint32 CombineFreeBlocks(HeapBlockDesc *block);
+	void *MoveMemory(void *ptr);
+	HeapBlockDesc *WhereShouldMemoryMove(void *ptr);
+	void *MoveHeapBlock(HeapBlockDesc *dst, HeapBlockDesc *src);
+	void PopMemId(void);
+	void PushMemId(int32 id);
+	void RegisterMemPointer(void *ptr);
+	void TidyHeap(void);
+	uint32 GetMemoryUsed(int32 id);
+	uint32 GetBlocksUsed(int32 id);
+	int32 GetLargestFreeBlock(void) { return m_freeList.m_last.m_prev->m_size; }
+
+	void ParseHeap(void);
+
+	HeapBlockDesc *GetDescFromHeapPointer(void *block)
+	{
+		return (HeapBlockDesc*)((uintptr)block - sizeof(HeapBlockDesc));
+	}
+	uint32 GetSizeBetweenBlocks(HeapBlockDesc *first, HeapBlockDesc *second)
+	{
+		return (uintptr)second - (uintptr)first - sizeof(HeapBlockDesc);
+	}
+	void FreeBlock(HeapBlockDesc *block){
+		for(int i = 0; i < NUM_FIXED_MEMBLOCKS; i++){
+			if(m_fixedSize[i].m_size == block->m_size){
+				m_fixedSize[i].Free(block);
+				return;
+			}
+		}
+		HeapBlockDesc *b = m_freeList.m_first.FindSmallestFreeBlock(block->m_size);
+		block->InsertHeapFreeBlock(b->m_prev);
+	}
+};
+
+extern CMemoryHeap gMainHeap;
diff --git a/src/rw/MemoryMgr.cpp b/src/rw/MemoryMgr.cpp
new file mode 100644
index 00000000..e2f6f144
--- /dev/null
+++ b/src/rw/MemoryMgr.cpp
@@ -0,0 +1,130 @@
+#include "common.h"
+#include "MemoryHeap.h"
+#include "MemoryMgr.h"
+
+
+uint8 *pMemoryTop;
+
+void
+InitMemoryMgr(void)
+{
+#ifdef USE_CUSTOM_ALLOCATOR
+#ifdef GTA_PS2
+#error "finish this"
+#else
+	// randomly allocate 128mb
+	gMainHeap.Init(128*1024*1024);
+#endif
+#endif
+}
+
+
+RwMemoryFunctions memFuncs = {
+	MemoryMgrMalloc,
+	MemoryMgrFree,
+	MemoryMgrRealloc,
+	MemoryMgrCalloc
+};
+
+#ifdef USE_CUSTOM_ALLOCATOR
+// game seems to be using heap directly here, but this is nicer
+void *operator new(size_t sz) { return MemoryMgrMalloc(sz); }
+void *operator new[](size_t sz) { return MemoryMgrMalloc(sz); }
+void operator delete(void *ptr) noexcept { MemoryMgrFree(ptr); }
+void operator delete[](void *ptr) noexcept { MemoryMgrFree(ptr); }
+#endif
+
+void*
+MemoryMgrMalloc(size_t size)
+{
+#ifdef USE_CUSTOM_ALLOCATOR
+	void *mem = gMainHeap.Malloc(size);
+#else
+	void *mem = malloc(size);
+#endif
+	if((uint8*)mem + size > pMemoryTop)
+		pMemoryTop = (uint8*)mem + size ;
+	return mem;
+}
+
+void*
+MemoryMgrRealloc(void *ptr, size_t size)
+{
+#ifdef USE_CUSTOM_ALLOCATOR
+	void *mem = gMainHeap.Realloc(ptr, size);
+#else
+	void *mem = realloc(ptr, size);
+#endif
+	if((uint8*)mem + size  > pMemoryTop)
+		pMemoryTop = (uint8*)mem + size ;
+	return mem;
+}
+
+void*
+MemoryMgrCalloc(size_t num, size_t size)
+{
+#ifdef USE_CUSTOM_ALLOCATOR
+	void *mem = gMainHeap.Malloc(num*size);
+#else
+	void *mem = calloc(num, size);
+#endif
+	if((uint8*)mem + size  > pMemoryTop)
+		pMemoryTop = (uint8*)mem + size ;
+#ifdef FIX_BUGS
+	memset(mem, 0, num*size);
+#endif
+	return mem;
+}
+
+void
+MemoryMgrFree(void *ptr)
+{
+#ifdef USE_CUSTOM_ALLOCATOR
+#ifdef FIX_BUGS
+	// i don't suppose this is handled by RW?
+	if(ptr == nil) return;
+#endif
+	gMainHeap.Free(ptr);
+#else
+	free(ptr);
+#endif
+}
+
+void *
+RwMallocAlign(RwUInt32 size, RwUInt32 align)
+{
+#ifdef FIX_BUGS
+	uintptr ptralign = align-1;
+	void *mem = (void *)MemoryMgrMalloc(size + sizeof(uintptr) + ptralign);
+
+	ASSERT(mem != nil);
+
+	void *addr = (void *)((((uintptr)mem) + sizeof(uintptr) + ptralign) & ~ptralign);
+
+	ASSERT(addr != nil);
+#else
+	void *mem = (void *)MemoryMgrMalloc(size + align);
+
+	ASSERT(mem != nil);
+
+	void *addr = (void *)((((uintptr)mem) + align) & ~(align - 1));
+
+	ASSERT(addr != nil);
+#endif
+
+	*(((void **)addr) - 1) = mem;
+
+	return addr;
+}
+
+void
+RwFreeAlign(void *mem)
+{
+	ASSERT(mem != nil);
+
+	void *addr = *(((void **)mem) - 1);
+
+	ASSERT(addr != nil);
+
+	MemoryMgrFree(addr);
+}
diff --git a/src/rw/MemoryMgr.h b/src/rw/MemoryMgr.h
new file mode 100644
index 00000000..e2962806
--- /dev/null
+++ b/src/rw/MemoryMgr.h
@@ -0,0 +1,12 @@
+#pragma once
+
+extern RwMemoryFunctions memFuncs;
+void InitMemoryMgr(void);
+
+void *MemoryMgrMalloc(size_t size);
+void *MemoryMgrRealloc(void *ptr, size_t size);
+void *MemoryMgrCalloc(size_t num, size_t size);
+void MemoryMgrFree(void *ptr);
+
+void *RwMallocAlign(RwUInt32 size, RwUInt32 align);
+void RwFreeAlign(void *mem);
diff --git a/src/rw/RwHelper.cpp b/src/rw/RwHelper.cpp
index 7d62a01c..8e41cdc9 100644
--- a/src/rw/RwHelper.cpp
+++ b/src/rw/RwHelper.cpp
@@ -63,45 +63,6 @@ void FlushObrsPrintfs()
 #endif
 }
 
-void *
-RwMallocAlign(RwUInt32 size, RwUInt32 align)
-{
-#ifdef FIX_BUGS
-	uintptr ptralign = align-1;
-	void *mem = (void *)malloc(size + sizeof(uintptr) + ptralign);
-
-	ASSERT(mem != nil);
-
-	void *addr = (void *)((((uintptr)mem) + sizeof(uintptr) + ptralign) & ~ptralign);
-
-	ASSERT(addr != nil);
-#else
-	void *mem = (void *)malloc(size + align);
-
-	ASSERT(mem != nil);
-
-	void *addr = (void *)((((uintptr)mem) + align) & ~(align - 1));
-
-	ASSERT(addr != nil);
-#endif
-
-	*(((void **)addr) - 1) = mem;
-
-	return addr;
-}
-
-void
-RwFreeAlign(void *mem)
-{
-	ASSERT(mem != nil);
-
-	void *addr = *(((void **)mem) - 1);
-
-	ASSERT(addr != nil);
-
-	free(addr);
-}
-
 void
 DefinedState(void)
 {
diff --git a/src/rw/RwHelper.h b/src/rw/RwHelper.h
index cf086e5a..9352d1fd 100644
--- a/src/rw/RwHelper.h
+++ b/src/rw/RwHelper.h
@@ -3,9 +3,6 @@
 extern bool gPS2alphaTest;
 extern bool gBackfaceCulling;
 
-void *RwMallocAlign(RwUInt32 size, RwUInt32 align);
-void RwFreeAlign(void *mem);
-
 void OpenCharsetSafe();
 void CreateDebugFont();
 void DestroyDebugFont();