diff --git a/milepost b/milepost
index f36e144..e9e9ab6 160000
--- a/milepost
+++ b/milepost
@@ -1 +1 @@
-Subproject commit f36e144bc0fed66470aff0612098dba29c552604
+Subproject commit e9e9ab68c250c597fd6b7552d97977b99b103d33
diff --git a/samples/pong/src/main.c b/samples/pong/src/main.c
index 240eebd..0e8a6d4 100644
--- a/samples/pong/src/main.c
+++ b/samples/pong/src/main.c
@@ -42,8 +42,11 @@ bool rightDown = false;
 
 g_font font;
 
+mem_arena arena;
+
 void OnInit(void)
 {
+	mem_arena_init(&arena);
 	font = g_font_create_default();
 	//log_string(str8_lit("init procedure\n"));
 }
@@ -95,6 +98,7 @@ void OnKeyUp(int key)
 
 void OnFrameRefresh(void)
 {
+	char* tmp = mem_arena_alloc(&arena, 512);
 	//log_string(str8_lit("frame procedure\n"));
 
 	f32 aspect = frameSize.x/frameSize.y;
@@ -168,4 +172,6 @@ void OnFrameRefresh(void)
 	g_fill();
 
     g_matrix_pop();
+
+    mem_arena_clear(&arena);
 }
diff --git a/sdk/orca.c b/sdk/orca.c
index 2ba3379..4c6120e 100644
--- a/sdk/orca.c
+++ b/sdk/orca.c
@@ -6,4 +6,5 @@
 *
 *****************************************************************/
 
-//#include"util/memory.c"
+#include"platform/orca_memory.c"
+#include"util/memory.c"
diff --git a/sdk/orca.h b/sdk/orca.h
index 683b4e2..a9db900 100644
--- a/sdk/orca.h
+++ b/sdk/orca.h
@@ -10,5 +10,6 @@
 
 #include"util/typedefs.h"
 #include"util/lists.h"
+#include"util/memory.h"
 
 #endif //__ORCA_H_
diff --git a/sdk/typedefs.h b/sdk/typedefs.h
deleted file mode 100644
index e0f7e10..0000000
--- a/sdk/typedefs.h
+++ /dev/null
@@ -1,69 +0,0 @@
-//*****************************************************************
-//
-//	$file: typedefs.h $
-//	$author: Martin Fouilleul $
-//	$date: 23/36/2015 $
-//	$revision: $
-//
-//*****************************************************************
-#ifndef __TYPEDEFS_H_
-#define __TYPEDEFS_H_
-
-#include<stdint.h>
-#include<float.h>	//FLT_MAX/MIN etc...
-
-#ifndef __cplusplus
-#include<stdbool.h>
-#endif //__cplusplus
-
-typedef uint8_t	 byte;
-typedef uint8_t	 u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef uint64_t u64;
-
-typedef int8_t	i8;
-typedef int16_t	i16;
-typedef int32_t	i32;
-typedef int64_t	i64;
-
-typedef float	f32;
-typedef double	f64;
-
-typedef union
-{
-	struct
-	{
-		f32 x;
-		f32 y;
-	};
-	f32 c[2];
-} vec2;
-
-typedef union
-{
-	struct
-	{
-		f32 x;
-		f32 y;
-		f32 z;
-		f32 w;
-	};
-	f32 c[4];
-} vec4;
-
-#define vec4_expand_xyz(v) (v).x, (v).y, (v).z
-
-typedef union
-{
-	struct
-	{
-		f32 x;
-		f32 y;
-		f32 w;
-		f32 h;
-	};
-	f32 c[4];
-} mp_rect;
-
-#endif //__TYPEDEFS_H_
diff --git a/src/bindgen_core_api.txt b/src/bindgen_core_api.txt
index 90a369d..6a434b3 100644
--- a/src/bindgen_core_api.txt
+++ b/src/bindgen_core_api.txt
@@ -3,4 +3,6 @@ log_int v(i)
 cosf f(f)
 sinf f(f)
 floorf f(f)
-sqrtf f(f)
\ No newline at end of file
+sqrtf f(f)
+orca_mem_grow i(I)
+orca_assert v(i)
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index d9d77f4..ee2027b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -10,13 +10,13 @@
 #include<pthread.h>
 #include<math.h>
 
-#include"wasm3.h"
-#include"m3_env.h"
-#include"m3_compile.h"
-
 #define MG_INCLUDE_GL_API
 #include"milepost.h"
 
+#include"orca_runtime.h"
+
+#include"memory_impl.c"
+
 #define LOG_SUBSYSTEM "Orca"
 
 
@@ -37,6 +37,11 @@ void mg_matrix_push_flat(float a11, float a12, float a13,
 	mg_matrix_push(m);
 }
 
+void orca_assert(bool x)
+{
+	ASSERT(x);
+}
+
 mg_font mg_font_create_default()
 {
 	//NOTE(martin): create default font
@@ -82,40 +87,10 @@ typedef struct orca_app
 	mg_surface mtlSurface;
 	mg_canvas canvas;
 
+	orca_runtime runtime;
+
 } orca_app;
 
-#define G_EVENTS(X) \
-	X(G_EVENT_START, "OnInit", "", "") \
-	X(G_EVENT_MOUSE_DOWN, "OnMouseDown", "", "i") \
-	X(G_EVENT_MOUSE_UP, "OnMouseUp", "", "i") \
-	X(G_EVENT_MOUSE_ENTER, "OnMouseEnter", "", "") \
-	X(G_EVENT_MOUSE_LEAVE, "OnMouseLeave", "", "") \
-	X(G_EVENT_MOUSE_MOVE, "OnMouseMove", "", "ffff") \
-	X(G_EVENT_MOUSE_WHEEL, "OnMouseWheel", "", "ff") \
-	X(G_EVENT_KEY_DOWN, "OnKeyDown", "", "i") \
-	X(G_EVENT_KEY_UP, "OnKeyUp", "", "i") \
-	X(G_EVENT_FRAME_REFRESH, "OnFrameRefresh", "", "") \
-	X(G_EVENT_FRAME_RESIZE, "OnFrameResize", "", "ii")
-
-typedef enum {
-	#define G_EVENT_KIND(kind, ...) kind,
-	G_EVENTS(G_EVENT_KIND)
-	G_EVENT_COUNT
-} guest_event_kind;
-
-
-typedef struct g_event_handler_desc
-{
-	str8 name;
-	str8 retTags;
-	str8 argTags;
-} g_event_handler_desc;
-
-const g_event_handler_desc G_EVENT_HANDLER_DESC[] = {
-	#define G_EVENT_HANDLER_DESC_ENTRY(kind, name, rets, args) {STR8(name), STR8(rets), STR8(args)},
-	G_EVENTS(G_EVENT_HANDLER_DESC_ENTRY)
-};
-
 char m3_type_to_tag(M3ValueType type)
 {
 	switch(type)
@@ -136,59 +111,27 @@ char m3_type_to_tag(M3ValueType type)
 	}
 }
 
-typedef struct host_memory
-{
-	char* ptr;
-	u32 reserved;
-	u32 committed;
-
-} host_memory;
-
-void host_memory_init(host_memory* memory)
+void orca_runtime_init(orca_runtime* runtime)
 {
+	memset(runtime, 0, sizeof(orca_runtime));
 	mem_base_allocator* allocator = mem_base_allocator_default();
-	memory->committed = 0;
-	memory->reserved = 4<<20;
-	memory->ptr = mem_base_reserve(allocator, memory->reserved);
+	runtime->wasmMemory.committed = 0;
+	runtime->wasmMemory.reserved = 4ULL<<30;
+	runtime->wasmMemory.ptr = mem_base_reserve(allocator, runtime->wasmMemory.reserved);
 }
 
-void* host_memory_resize_callback(void* p, unsigned long size, void* userData)
+orca_app __orcaApp;
+
+orca_runtime* orca_runtime_get()
 {
-	host_memory* memory = (host_memory*)userData;
-
-	if(memory->committed >= size)
-	{
-		return(memory->ptr);
-	}
-	else if(memory->committed < memory->reserved)
-	{
-		u32 commitSize = size - memory->committed;
-
-		mem_base_allocator* allocator = mem_base_allocator_default();
-		mem_base_commit(allocator, memory->ptr + memory->committed, commitSize);
-		memory->committed += commitSize;
-		return(memory->ptr);
-	}
-	else
-	{
-		DEBUG_ASSERT(0, "Out of memory");
-		return(0);
-	}
-}
-
-void host_memory_free_callback(void* p, void* userData)
-{
-	host_memory* memory = (host_memory*)userData;
-
-	mem_base_allocator* allocator = mem_base_allocator_default();
-	mem_base_release(allocator, memory->ptr, memory->reserved);
-	memset(memory, 0, sizeof(host_memory));
+	return(&__orcaApp.runtime);
 }
 
 void* orca_runloop(void* user)
 {
-	orca_app* app = (orca_app*)user;
-	mem_arena_init(mem_scratch());
+	orca_app* app = &__orcaApp;
+
+	orca_runtime_init(&app->runtime);
 
 	//NOTE: loads wasm module
 	const char* bundleNameCString = "module";
@@ -206,49 +149,46 @@ void* orca_runloop(void* user)
 	u64 wasmSize = ftell(file);
 	rewind(file);
 
-	u8* wasmBytes = malloc_array(u8, wasmSize);
-	fread(wasmBytes, 1, wasmSize, file);
+	app->runtime.wasmBytecode.len = wasmSize;
+	app->runtime.wasmBytecode.ptr = malloc_array(char, wasmSize);
+	fread(app->runtime.wasmBytecode.ptr, 1, app->runtime.wasmBytecode.len, file);
 	fclose(file);
 
 	u32 stackSize = 65536;
-	IM3Environment env = m3_NewEnvironment();
+	app->runtime.m3Env = m3_NewEnvironment();
 
-	host_memory hostMemory = {};
-	host_memory_init(&hostMemory);
-
-	IM3Runtime runtime = m3_NewRuntime(env, stackSize, NULL);
-	m3_RuntimeSetMemoryCallbacks(runtime, host_memory_resize_callback, host_memory_free_callback, &hostMemory);
+	app->runtime.m3Runtime = m3_NewRuntime(app->runtime.m3Env, stackSize, NULL);
+	m3_RuntimeSetMemoryCallbacks(app->runtime.m3Runtime, wasm_memory_resize_callback, wasm_memory_free_callback, &app->runtime.wasmMemory);
 	//NOTE: host memory will be freed when runtime is freed.
 
-	IM3Module module = 0;
-
 	//TODO check errors
-	m3_ParseModule(env, &module, wasmBytes, wasmSize);
-	m3_LoadModule(runtime, module);
-	m3_SetModuleName(module, bundleNameCString);
+	m3_ParseModule(app->runtime.m3Env, &app->runtime.m3Module, (u8*)app->runtime.wasmBytecode.ptr, app->runtime.wasmBytecode.len);
+	m3_LoadModule(app->runtime.m3Runtime, app->runtime.m3Module);
+	m3_SetModuleName(app->runtime.m3Module, bundleNameCString);
 
 	mem_scratch_clear();
 
 	//NOTE: bind orca APIs
-	bindgen_link_core_api(module);
-	bindgen_link_canvas_api(module);
-	bindgen_link_gles_api(module);
-	manual_link_gles_api(module);
+	bindgen_link_core_api(app->runtime.m3Module);
+	bindgen_link_canvas_api(app->runtime.m3Module);
+	bindgen_link_gles_api(app->runtime.m3Module);
+	manual_link_gles_api(app->runtime.m3Module);
 
 	//NOTE: compile
-	M3Result res = m3_CompileModule(module);
+	M3Result res = m3_CompileModule(app->runtime.m3Module);
 	if(res)
 	{
 		M3ErrorInfo errInfo = {};
-		m3_GetErrorInfo(runtime, &errInfo);
+		m3_GetErrorInfo(app->runtime.m3Runtime, &errInfo);
 
 		LOG_ERROR("wasm error: %s\n", errInfo.message);
+		return((void*)-1);
 	}
 
 	//NOTE: Find heap base
 	u32 heapBase = 0;
 	{
-		IM3Global global = m3_FindGlobal(module, "__heap_base");
+		IM3Global global = m3_FindGlobal(app->runtime.m3Module, "__heap_base");
 		if(global)
 		{
 			M3TaggedValue val;
@@ -271,15 +211,15 @@ void* orca_runloop(void* user)
 	}
 	//NOTE: align heap base on 16Bytes
 	heapBase = AlignUpOnPow2(heapBase, 16);
-	LOG_MESSAGE("mem_size = %u,  __heap_base = %u\n", m3_GetMemorySize(runtime), heapBase);
+	LOG_MESSAGE("mem_size = %u,  __heap_base = %u\n", m3_GetMemorySize(app->runtime.m3Runtime), heapBase);
 
 	//NOTE: Find and type check event handlers.
-	IM3Function eventHandlers[G_EVENT_COUNT] = {0};
+
 	for(int i=0; i<G_EVENT_COUNT; i++)
 	{
 		const g_event_handler_desc* desc = &G_EVENT_HANDLER_DESC[i];
 		IM3Function handler = 0;
-		m3_FindFunction(&handler, runtime, desc->name.ptr);
+		m3_FindFunction(&handler, app->runtime.m3Runtime, desc->name.ptr);
 
 		if(handler)
 		{
@@ -320,7 +260,7 @@ void* orca_runloop(void* user)
 
 			if(checked)
 			{
-				eventHandlers[i] = handler;
+				app->runtime.eventHandlers[i] = handler;
 			}
 			else
 			{
@@ -334,6 +274,8 @@ void* orca_runloop(void* user)
 	//NOTE: prepare GL surface
 	mg_surface_prepare(app->surface);
 
+	IM3Function* eventHandlers = app->runtime.eventHandlers;
+
 	//NOTE: call init handler
 	if(eventHandlers[G_EVENT_START])
 	{
@@ -431,18 +373,6 @@ void* orca_runloop(void* user)
 			}
 		}
 
-/*		mg_surface_prepare(app->surface);
-			glClearColor(1, 0, 1, 1);
-			glClear(GL_COLOR_BUFFER_BIT);
-
-			if(eventHandlers[G_EVENT_FRAME_REFRESH])
-			{
-				m3_Call(eventHandlers[G_EVENT_FRAME_REFRESH], 0, 0);
-			}
-
-		mg_surface_present(app->surface);
-*/
-
 		mg_canvas_prepare(app->canvas);
 
 			if(eventHandlers[G_EVENT_FRAME_REFRESH])
@@ -488,13 +418,13 @@ int main(int argc, char** argv)
 	mg_surface_swap_interval(mtlSurface, 1);
 	mg_canvas canvas = mg_canvas_create(mtlSurface);
 
-	orca_app app = {.window = window,
-	                .surface = surface,
-	                .mtlSurface = mtlSurface,
-	                .canvas = canvas};
+	__orcaApp = (orca_app){.window = window,
+	                       .surface = surface,
+	                       .mtlSurface = mtlSurface,
+	                       .canvas = canvas};
 
 	pthread_t runloopThread;
-	pthread_create(&runloopThread, 0, orca_runloop, &app);
+	pthread_create(&runloopThread, 0, orca_runloop, 0);
 
 	while(!mp_should_quit())
 	{
diff --git a/src/memory_impl.c b/src/memory_impl.c
new file mode 100644
index 0000000..c940b9d
--- /dev/null
+++ b/src/memory_impl.c
@@ -0,0 +1,59 @@
+/************************************************************//**
+*
+*	@file: memory_impl.c
+*	@author: Martin Fouilleul
+*	@date: 17/04/2023
+*
+*****************************************************************/
+
+#include"orca_runtime.h"
+
+void* wasm_memory_resize_callback(void* p, unsigned long size, void* userData)
+{
+	wasm_memory* memory = (wasm_memory*)userData;
+
+	if(memory->committed >= size)
+	{
+		return(memory->ptr);
+	}
+	else if(memory->committed < memory->reserved)
+	{
+		u32 commitSize = size - memory->committed;
+
+		mem_base_allocator* allocator = mem_base_allocator_default();
+		mem_base_commit(allocator, memory->ptr + memory->committed, commitSize);
+		memory->committed += commitSize;
+		return(memory->ptr);
+	}
+	else
+	{
+		DEBUG_ASSERT(0, "Out of memory");
+		return(0);
+	}
+}
+
+void wasm_memory_free_callback(void* p, void* userData)
+{
+	wasm_memory* memory = (wasm_memory*)userData;
+
+	mem_base_allocator* allocator = mem_base_allocator_default();
+	mem_base_release(allocator, memory->ptr, memory->reserved);
+	memset(memory, 0, sizeof(wasm_memory));
+}
+
+extern u32 orca_mem_grow(u64 size)
+{
+	orca_runtime* runtime = orca_runtime_get();
+	wasm_memory* memory = &runtime->wasmMemory;
+
+	size = AlignUpOnPow2(size, d_m3MemPageSize);
+	u64 totalSize = size + m3_GetMemorySize(runtime->m3Runtime);
+
+	u32 addr = memory->committed;
+
+	//NOTE: call resize memory, which will call our custom resize callback... this is a bit involved because
+	//      wasm3 doesn't allow resizing the memory directly
+	M3Result res = ResizeMemory(runtime->m3Runtime, totalSize/d_m3MemPageSize);
+
+	return(addr);
+}
diff --git a/src/orca_runtime.h b/src/orca_runtime.h
new file mode 100644
index 0000000..def757d
--- /dev/null
+++ b/src/orca_runtime.h
@@ -0,0 +1,72 @@
+/************************************************************//**
+*
+*	@file: orca_runtime.h
+*	@author: Martin Fouilleul
+*	@date: 17/04/2023
+*
+*****************************************************************/
+#ifndef __ORCA_RUNTIME_H_
+#define __ORCA_RUNTIME_H_
+
+#include"wasm3.h"
+#include"m3_env.h"
+#include"m3_compile.h"
+
+#define G_EVENTS(X) \
+	X(G_EVENT_START, "OnInit", "", "") \
+	X(G_EVENT_MOUSE_DOWN, "OnMouseDown", "", "i") \
+	X(G_EVENT_MOUSE_UP, "OnMouseUp", "", "i") \
+	X(G_EVENT_MOUSE_ENTER, "OnMouseEnter", "", "") \
+	X(G_EVENT_MOUSE_LEAVE, "OnMouseLeave", "", "") \
+	X(G_EVENT_MOUSE_MOVE, "OnMouseMove", "", "ffff") \
+	X(G_EVENT_MOUSE_WHEEL, "OnMouseWheel", "", "ff") \
+	X(G_EVENT_KEY_DOWN, "OnKeyDown", "", "i") \
+	X(G_EVENT_KEY_UP, "OnKeyUp", "", "i") \
+	X(G_EVENT_FRAME_REFRESH, "OnFrameRefresh", "", "") \
+	X(G_EVENT_FRAME_RESIZE, "OnFrameResize", "", "ii")
+
+typedef enum {
+	#define G_EVENT_KIND(kind, ...) kind,
+	G_EVENTS(G_EVENT_KIND)
+	G_EVENT_COUNT
+} guest_event_kind;
+
+
+typedef struct g_event_handler_desc
+{
+	str8 name;
+	str8 retTags;
+	str8 argTags;
+} g_event_handler_desc;
+
+const g_event_handler_desc G_EVENT_HANDLER_DESC[] = {
+	#define G_EVENT_HANDLER_DESC_ENTRY(kind, name, rets, args) {STR8(name), STR8(rets), STR8(args)},
+	G_EVENTS(G_EVENT_HANDLER_DESC_ENTRY)
+};
+
+typedef struct wasm_memory
+{
+	char* ptr;
+	u64 reserved;
+	u64 committed;
+
+} wasm_memory;
+
+typedef struct orca_runtime
+{
+	str8 wasmBytecode;
+	wasm_memory wasmMemory;
+
+	// wasm3 data
+	IM3Environment m3Env;
+	IM3Runtime m3Runtime;
+	IM3Module m3Module;
+	IM3Function eventHandlers[G_EVENT_COUNT];
+
+} orca_runtime;
+
+
+orca_runtime* orca_runtime_get();
+
+
+#endif //__ORCA_RUNTIME_H_