diff --git a/source/tools/atlas/AtlasUI/AtlasUI.vcproj b/source/tools/atlas/AtlasUI/AtlasUI.vcproj
index 2e052c6290..28bef702f2 100644
--- a/source/tools/atlas/AtlasUI/AtlasUI.vcproj
+++ b/source/tools/atlas/AtlasUI/AtlasUI.vcproj
@@ -281,6 +281,16 @@
 						RelativePath=".\CustomControls\FileHistory\FileHistory.h">
 					</File>
 				</Filter>
+				<Filter
+					Name="HighResTimer"
+					Filter="">
+					<File
+						RelativePath=".\CustomControls\HighResTimer\HighResTimer.cpp">
+					</File>
+					<File
+						RelativePath=".\CustomControls\HighResTimer\HighResTimer.h">
+					</File>
+				</Filter>
 			</Filter>
 			<Filter
 				Name="Misc"
diff --git a/source/tools/atlas/AtlasUI/CustomControls/HighResTimer/HighResTimer.cpp b/source/tools/atlas/AtlasUI/CustomControls/HighResTimer/HighResTimer.cpp
new file mode 100644
index 0000000000..fc257f1d4a
--- /dev/null
+++ b/source/tools/atlas/AtlasUI/CustomControls/HighResTimer/HighResTimer.cpp
@@ -0,0 +1,31 @@
+#include "stdafx.h"
+
+#include "HighResTimer.h"
+
+// TODO: Portability and general betterness. (But it's good enough for now.)
+
+HighResTimer::HighResTimer()
+{
+	LARGE_INTEGER freq;
+	BOOL ok = QueryPerformanceFrequency(&freq);
+	if (! ok)
+	{
+		wxLogError(_("QPF failed!"));
+	}
+	else
+	{
+		m_TickLength = freq.QuadPart;
+	}
+}
+
+double HighResTimer::GetTime()
+{
+	LARGE_INTEGER count;
+	BOOL ok = QueryPerformanceCounter(&count);
+	if (! ok)
+	{
+		wxLogError(_("QPC failed!"));
+		return 0.0;
+	}
+	return (double)count.QuadPart / (double)m_TickLength.GetValue();
+}
diff --git a/source/tools/atlas/AtlasUI/CustomControls/HighResTimer/HighResTimer.h b/source/tools/atlas/AtlasUI/CustomControls/HighResTimer/HighResTimer.h
new file mode 100644
index 0000000000..bea824f18f
--- /dev/null
+++ b/source/tools/atlas/AtlasUI/CustomControls/HighResTimer/HighResTimer.h
@@ -0,0 +1,9 @@
+class HighResTimer
+{
+public:
+	HighResTimer();
+	double GetTime(); // in seconds, relative to some arbitrary time
+
+private:
+	wxLongLong m_TickLength;
+};
diff --git a/source/tools/atlas/AtlasUI/Misc/DLLInterface.h b/source/tools/atlas/AtlasUI/Misc/DLLInterface.h
index da67073858..587e732fd9 100644
--- a/source/tools/atlas/AtlasUI/Misc/DLLInterface.h
+++ b/source/tools/atlas/AtlasUI/Misc/DLLInterface.h
@@ -4,3 +4,8 @@ namespace AtlasMessage { class MessageHandler; }
 
 ATLASDLLIMPEXP void Atlas_SetMessageHandler(AtlasMessage::MessageHandler*);
 ATLASDLLIMPEXP void Atlas_StartWindow(wchar_t* type);
+
+ATLASDLLIMPEXP void Atlas_GLSetCurrent(void* context);
+ATLASDLLIMPEXP void Atlas_GLSwapBuffers(void* context);
+
+ATLASDLLIMPEXP void Atlas_NotifyEndOfFrame();
diff --git a/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.cpp b/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.cpp
index 9ff8bb3cdc..a5a5920374 100644
--- a/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.cpp
+++ b/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.cpp
@@ -4,6 +4,7 @@
 
 #include "wx/glcanvas.h"
 #include "CustomControls/SnapSplitterWindow/SnapSplitterWindow.h"
+#include "CustomControls/HighResTimer/HighResTimer.h"
 
 #include "GameInterface/MessagePasser.h"
 #include "GameInterface/Messages.h"
@@ -14,6 +15,8 @@
 
 //#define UI_ONLY
 
+static HighResTimer g_Timer;
+
 //////////////////////////////////////////////////////////////////////////
 
 // TODO: move into another file
@@ -100,17 +103,40 @@ private:
 	DECLARE_EVENT_TABLE();
 };
 BEGIN_EVENT_TABLE(Canvas, wxGLCanvas)
-	EVT_SIZE(Canvas::OnResize)
-	EVT_KEY_DOWN(Canvas::OnKeyDown)
-	EVT_KEY_UP(Canvas::OnKeyUp)
+	EVT_SIZE      (Canvas::OnResize)
+	EVT_KEY_DOWN  (Canvas::OnKeyDown)
+	EVT_KEY_UP    (Canvas::OnKeyUp)
 	
-	EVT_LEFT_DOWN(Canvas::OnMouse)
-	EVT_LEFT_UP  (Canvas::OnMouse)
-	EVT_MOTION   (Canvas::OnMouse)
+	EVT_LEFT_DOWN (Canvas::OnMouse)
+	EVT_LEFT_UP   (Canvas::OnMouse)
+	EVT_RIGHT_DOWN(Canvas::OnMouse)
+	EVT_RIGHT_UP  (Canvas::OnMouse)
+	EVT_MOTION    (Canvas::OnMouse)
 END_EVENT_TABLE()
 
+// GL functions exported from DLL, and called by game (in a separate
+// thread to the standard wx one)
+ATLASDLLIMPEXP void Atlas_GLSetCurrent(void* context)
+{
+	((wxGLContext*)context)->SetCurrent();
+}
+
+ATLASDLLIMPEXP void Atlas_GLSwapBuffers(void* context)
+{
+	((wxGLContext*)context)->SwapBuffers();
+}
+
+
 //////////////////////////////////////////////////////////////////////////
 
+
+volatile bool g_FrameHasEnded;
+// Called from game thread
+ATLASDLLIMPEXP void Atlas_NotifyEndOfFrame()
+{
+	g_FrameHasEnded = true;
+}
+
 enum
 {
 	ID_Quit = 1,
@@ -133,6 +159,8 @@ BEGIN_EVENT_TABLE(ScenarioEditor, wxFrame)
 	EVT_MENU(wxID_REDO, ScenarioEditor::OnRedo)
 
 	EVT_MENU(ID_Wireframe, ScenarioEditor::OnWireframe)
+
+	EVT_IDLE(ScenarioEditor::OnIdle)
 END_EVENT_TABLE()
 
 
@@ -213,7 +241,7 @@ ScenarioEditor::ScenarioEditor(wxWindow* parent)
 	// Send setup messages to game engine:
 
 #ifndef UI_ONLY
-	ADD_COMMAND(SetContext(canvas->GetHDC(), canvas->GetContext()->GetGLRC()));
+	ADD_COMMAND(SetContext(canvas->GetContext()));
 
 	ADD_COMMAND(CommandString("init"));
 
@@ -225,8 +253,9 @@ ScenarioEditor::ScenarioEditor(wxWindow* parent)
 	// XXX
 	USE_TOOL(AlterElevation);
 
+	// Set up a timer to make sure tool-updates happen even when there's no idle time
 	m_Timer.SetOwner(this);
-	m_Timer.Start(50);
+	m_Timer.Start(20);
 }
 
 
@@ -244,13 +273,26 @@ void ScenarioEditor::OnClose(wxCloseEvent&)
 }
 
 
+static void UpdateTool()
+{
+	// Don't keep posting events if the game can't keep up
+	if (g_FrameHasEnded)
+	{
+		g_FrameHasEnded = false; // (threadiness doesn't matter here)
+		// TODO: Smoother timing stuff?
+		static double last = g_Timer.GetTime();
+		double time = g_Timer.GetTime();
+		g_CurrentTool->OnTick(time-last);
+		last = time;
+	}
+}
 void ScenarioEditor::OnTimer(wxTimerEvent&)
 {
-	// TODO: Improve timer stuff - smoother, etc
-	static wxLongLong last = wxGetLocalTimeMillis();
-	wxLongLong time = wxGetLocalTimeMillis();
-	g_CurrentTool->OnTick((time-last).ToLong());
-	last = time;
+	UpdateTool();
+}
+void ScenarioEditor::OnIdle(wxIdleEvent&)
+{
+	UpdateTool();
 }
 
 void ScenarioEditor::OnQuit(wxCommandEvent&)
diff --git a/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.h b/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.h
index 6f9ef0a527..57436c9cad 100644
--- a/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.h
+++ b/source/tools/atlas/AtlasUI/ScenarioEditor/ScenarioEditor.h
@@ -9,6 +9,7 @@ public:
 	ScenarioEditor(wxWindow* parent);
 	void OnClose(wxCloseEvent& event);
 	void OnTimer(wxTimerEvent& event);
+	void OnIdle(wxIdleEvent& event);
 	
 	void OnQuit(wxCommandEvent& event);
 	void OnUndo(wxCommandEvent& event);
diff --git a/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/AlterElevation.cpp b/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/AlterElevation.cpp
index bf3d3f9f0a..c79704f727 100644
--- a/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/AlterElevation.cpp
+++ b/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/AlterElevation.cpp
@@ -10,7 +10,7 @@ class AlterElevation : public ITool
 {
 public:
 	AlterElevation()
-		: m_IsActive(false)
+		: m_Direction(0)
 	{
 	}
 
@@ -19,13 +19,19 @@ public:
 		if (evt.LeftDown())
 		{
 			ScenarioEditor::GetCommandProc().FinaliseLastCommand();
-			m_IsActive = true;
+			m_Direction = +1;
 			m_Pos = Position(evt.GetPosition());
 		}
-		else if (evt.LeftUp())
+		else if (evt.RightDown())
 		{
 			ScenarioEditor::GetCommandProc().FinaliseLastCommand();
-			m_IsActive = false;
+			m_Direction = -1;
+			m_Pos = Position(evt.GetPosition());
+		}
+		else if (evt.LeftUp() || evt.RightUp())
+		{
+			ScenarioEditor::GetCommandProc().FinaliseLastCommand();
+			m_Direction = 0;
 		}
 		else if (evt.Dragging())
 		{
@@ -44,15 +50,18 @@ public:
 
 	void OnTick(float dt)
 	{
-		if (m_IsActive)
+		if (m_Direction)
 		{
-			ADD_WORLDCOMMAND(AlterElevation, (m_Pos, dt*4.096f));
+			// TODO: If the mouse hasn't been moved in this stroke, use the
+			// same tile position as last time (else it's annoying when digging
+			// deep holes or building tall hills.)
+			ADD_WORLDCOMMAND(AlterElevation, (m_Pos, dt*4096.f*m_Direction));
 		}
 	}
 
 private:
 
-	bool m_IsActive;
+	int m_Direction; // +1 = raise, -1 = lower, 0 = inactive
 	Position m_Pos;
 };
 
diff --git a/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/Common/Tools.h b/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/Common/Tools.h
index 440ebb1f5c..dbe5c2d67a 100644
--- a/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/Common/Tools.h
+++ b/source/tools/atlas/AtlasUI/ScenarioEditor/Tools/Common/Tools.h
@@ -14,7 +14,7 @@ public:
 
 	virtual void OnMouse(wxMouseEvent& evt) = 0;
 	virtual void OnKey(wxKeyEvent& evt, int dir) = 0;
-	virtual void OnTick(float dt) = 0;
+	virtual void OnTick(float dt) = 0; // dt in seconds
 
 	virtual ~ITool() {};
 };
diff --git a/source/tools/atlas/GameInterface/GameLoop.cpp b/source/tools/atlas/GameInterface/GameLoop.cpp
index 7db7b67a0f..9b5837c0b7 100644
--- a/source/tools/atlas/GameInterface/GameLoop.cpp
+++ b/source/tools/atlas/GameInterface/GameLoop.cpp
@@ -13,23 +13,17 @@
 #include "lib/timer.h"
 #include "ps/CLogger.h"
 
-#include <assert.h>
-
 using namespace AtlasMessage;
 
 extern void Render_();
 
-#define __declspec(spec_)
-#define __stdcall
-
-extern "C" { __declspec(dllimport) int __stdcall SwapBuffers(void*); }
-	// HACK (and not exactly portable)
-	//
-	// (Er, actually that's what most of this file is. Oh well.)
-
 // Loaded from DLL:
 void (*Atlas_StartWindow)(wchar_t* type);
 void (*Atlas_SetMessagePasser)(MessagePasser<mCommand>*, MessagePasser<mInput>*);
+void (*Atlas_GLSetCurrent)(void* context);
+void (*Atlas_GLSwapBuffers)(void* context);
+void (*Atlas_NotifyEndOfFrame)();
+
 
 static MessagePasserImpl<mCommand> msgPasser_Command;
 static MessagePasserImpl<mInput>   msgPasser_Input;
@@ -49,11 +43,14 @@ static void* LaunchWindow(void*)
 
 bool BeginAtlas(int argc, char* argv[], void* dll) 
 {
-	*(void**)&Atlas_StartWindow = dlsym(dll, "Atlas_StartWindow");
-	*(void**)&Atlas_SetMessagePasser = dlsym(dll, "Atlas_SetMessagePasser");
-
-	if (!Atlas_StartWindow || !Atlas_SetMessagePasser)
-		return false;
+	// Load required symbols from the DLL
+#define GET(x) *(void**)&x = dlsym(dll, #x); if (! x) return false;
+	GET(Atlas_StartWindow);
+	GET(Atlas_SetMessagePasser);
+	GET(Atlas_GLSetCurrent);
+	GET(Atlas_GLSwapBuffers);
+	GET(Atlas_NotifyEndOfFrame);
+#undef GET
 
 	// Pass our message handler to Atlas
 	Atlas_SetMessagePasser(&msgPasser_Command, &msgPasser_Input);
@@ -66,7 +63,9 @@ bool BeginAtlas(int argc, char* argv[], void* dll)
 	state.argv = argv;
 	state.running = true;
 	state.rendering = false;
-	state.currentDC = NULL;
+	state.glContext = NULL;
+
+	double last_activity = get_time();
 
 	while (state.running)
 	{
@@ -82,18 +81,18 @@ bool BeginAtlas(int argc, char* argv[], void* dll)
 			static double last_time = time;
 			const float length = (float)(time-last_time);
 			last_time = time;
-			assert(length >= 0.0f);
+			debug_assert(length >= 0.0f);
 			// TODO: filter out big jumps, e.g. when having done a lot of slow
 			// processing in the last frame
 			state.frameLength = length;
 		}
 
+		// Process the input that was received in the past
 		if (g_Input.ProcessInput(&state))
 			recent_activity = true;
 
 		//////////////////////////////////////////////////////////////////////////
 		
-		// if (!(in interactive-tool mode))
 		{
 			mCommand* msg;
 			while ((msg = msgPasser_Command.Retrieve()) != NULL)
@@ -164,18 +163,36 @@ bool BeginAtlas(int argc, char* argv[], void* dll)
 		{
 			Render_();
 			glFinish();
-#if OS_WIN
-			SwapBuffers((void*)state.currentDC);
-#endif
+			Atlas_GLSwapBuffers((void*)state.glContext);
 		}
 
-		// Be nice to the processor if we're not doing anything useful, but
-		// nice to the user if we are
-		if (! recent_activity)
-			SDL_Delay(100);
+		Atlas_NotifyEndOfFrame();
+
+		double time = get_time();
+		if (recent_activity)
+			last_activity = time;
+
+		// Be nice to the processor (by sleeping) if we're not doing anything
+		// useful, but nice to the user (by just yielding to other threads) if we are
+		
+		if (time - last_activity > 0.5) // if there was no recent activity...
+		{
+			double sleepUntil = time + 0.5; // only redraw at 2fps
+			while (time < sleepUntil)
+			{
+				// To minimise latency when the user starts doing stuff, only
+				// sleep for a short while, then check if anything's happened,
+				// then go back to sleep
+				SDL_Delay(50);
+				if (!msgPasser_Input.IsEmpty() || !msgPasser_Command.IsEmpty())
+					break;
+				time = get_time();
+			}
+		}
 		else
+		{
 			SDL_Delay(0);
-		// Probable TODO: allow interruption of sleep by incoming messages
+		}
 	}
 
 	// TODO: delete all remaining messages, to avoid memory leak warnings
diff --git a/source/tools/atlas/GameInterface/GameLoop.h b/source/tools/atlas/GameInterface/GameLoop.h
index 43c34bbf17..9e681ea0e7 100644
--- a/source/tools/atlas/GameInterface/GameLoop.h
+++ b/source/tools/atlas/GameInterface/GameLoop.h
@@ -1,13 +1,15 @@
 #ifndef GAMELOOP_H__
 #define GAMELOOP_H__
 
+extern void (*Atlas_GLSetCurrent)(void* context);
+
 struct GameLoopState
 {
 	int argc;
 	char** argv;
 	bool running;
 	bool rendering;
-	const void* currentDC;
+	const void* glContext;
 	float frameLength; // smoothed to avoid large jumps
 
 	struct
diff --git a/source/tools/atlas/GameInterface/Handlers/Elevation.cpp b/source/tools/atlas/GameInterface/Handlers/Elevation.cpp
index d9d05f3a39..2572af4da7 100644
--- a/source/tools/atlas/GameInterface/Handlers/Elevation.cpp
+++ b/source/tools/atlas/GameInterface/Handlers/Elevation.cpp
@@ -9,6 +9,7 @@
 
 namespace AtlasMessage {
 
+
 BEGIN_COMMAND(AlterElevation)
 
 	// TODO: much more efficient version of this, and without the memory leaks
@@ -25,7 +26,8 @@ BEGIN_COMMAND(AlterElevation)
 		delete NewTerrain;
 	}
 
-	void Do() {
+	void Do()
+	{
 
 		CTerrain* terrain = g_Game->GetWorld()->GetTerrain();
 
@@ -33,16 +35,29 @@ BEGIN_COMMAND(AlterElevation)
 		OldTerrain = new u16[verts];
 		memcpy(OldTerrain, terrain->GetHeightMap(), verts*sizeof(u16));
 
+		int amount = (int)d->amount;
+//		debug_printf("%d\n", amount);
+
+		// If the thing's being updated very fast, 'amount' is often very
+		// small (even zero) so the integer truncation is significant
+		static float roundingError = 0.0;
+		roundingError += d->amount - (float)amount;
+		if (roundingError >= 1.f)
+		{
+			amount += (int)roundingError;
+			roundingError -= (float)(int)roundingError;
+		}
+
 		CVector3D vec;
 		d->pos.GetWorldSpace(vec);
 		uint32_t x, z;
 		terrain->CalcFromPosition(vec, x, z);
-		terrain->RaiseVertex(x, z, (int)d->amount);
+		terrain->RaiseVertex(x, z, amount);
 		terrain->MakeDirty(x, z, x, z);
-
 	}
 
-	void Undo() {
+	void Undo()
+	{
 		CTerrain* terrain = g_Game->GetWorld()->GetTerrain();
 		if (! NewTerrain)
 		{
@@ -53,12 +68,14 @@ BEGIN_COMMAND(AlterElevation)
 		terrain->SetHeightMap(OldTerrain); // CTerrain duplicates the data
 	}
 
-	void Redo() {
+	void Redo()
+	{
 		CTerrain* terrain = g_Game->GetWorld()->GetTerrain();
 		terrain->SetHeightMap(NewTerrain); // CTerrain duplicates the data
 	}
 
-	void MergeWithSelf(cAlterElevation* prev) {
+	void MergeWithSelf(cAlterElevation* prev)
+	{
 		std::swap(prev->NewTerrain, NewTerrain);
 	}
 
diff --git a/source/tools/atlas/GameInterface/Handlers/GraphicsSetup.cpp b/source/tools/atlas/GameInterface/Handlers/GraphicsSetup.cpp
index 835970aec7..8025b4a11e 100644
--- a/source/tools/atlas/GameInterface/Handlers/GraphicsSetup.cpp
+++ b/source/tools/atlas/GameInterface/Handlers/GraphicsSetup.cpp
@@ -82,10 +82,8 @@ REGISTER(CommandString_render_disable);
 void fSetContext(IMessage* msg)
 {
 	mSetContext* cmd = static_cast<mSetContext*>(msg);
-#if OS_WIN
-	wglMakeCurrent((HDC)cmd->hdc, (HGLRC)cmd->hglrc);
-	g_GameLoop->currentDC = cmd->hdc;
-#endif
+	g_GameLoop->glContext = cmd->context;
+	Atlas_GLSetCurrent((void*)g_GameLoop->glContext);
 }
 REGISTER(SetContext);
 
diff --git a/source/tools/atlas/GameInterface/Handlers/MessageHandler.h b/source/tools/atlas/GameInterface/Handlers/MessageHandler.h
index 95a9626bb4..e3fcaddcb8 100644
--- a/source/tools/atlas/GameInterface/Handlers/MessageHandler.h
+++ b/source/tools/atlas/GameInterface/Handlers/MessageHandler.h
@@ -15,6 +15,7 @@ extern msgHandlers& GetMsgHandlers();
 #define CAT1(a,b) a##b
 #define CAT2(a,b) CAT1(a,b)
 
+// TODO quite urgently: Fix this, because it's broken and not very helpful anyway
 #define REGISTER(t) namespace CAT2(hndlr_, __LINE__) { struct init { init() { \
 	bool notAlreadyRegisted = GetMsgHandlers().insert(std::pair<std::string, msgHandler>(#t, &f##t)).second; \
 	assert(notAlreadyRegisted); \
diff --git a/source/tools/atlas/GameInterface/InputProcessor.cpp b/source/tools/atlas/GameInterface/InputProcessor.cpp
index ad57533242..8e0d1732d4 100644
--- a/source/tools/atlas/GameInterface/InputProcessor.cpp
+++ b/source/tools/atlas/GameInterface/InputProcessor.cpp
@@ -5,8 +5,6 @@
 #include "ps/Game.h"
 #include "graphics/Camera.h"
 
-#include <assert.h>
-
 bool InputProcessor::ProcessInput(GameLoopState* state)
 {
 	if (! g_Game)
@@ -24,13 +22,6 @@ bool InputProcessor::ProcessInput(GameLoopState* state)
 	else
 		forwards.Normalize();
 
-	float l;
-	l = forwards.GetLength();
-	assert(fabsf(l - 1.f) < 0.0001f);
-	l = leftwards.GetLength();
-	assert(fabsf(l - 1.f) < 0.0001f);
-
-
 	bool moved = false;
 
 	if (state->input.scrollSpeed[0] != 0.0f)
diff --git a/source/tools/atlas/GameInterface/MessagePasser.h b/source/tools/atlas/GameInterface/MessagePasser.h
index 0b3e436fc3..71dfc7324a 100644
--- a/source/tools/atlas/GameInterface/MessagePasser.h
+++ b/source/tools/atlas/GameInterface/MessagePasser.h
@@ -9,9 +9,6 @@ template <typename T> class MessagePasser
 public:
 	virtual void Add(T*)=0;
 	virtual T* Retrieve()=0;
-	
-	virtual void Query(T&)=0;
-	virtual void QueryDone()=0;
 };
 
 struct mCommand;
@@ -24,13 +21,4 @@ extern MessagePasser<mInput>*   g_MessagePasser_Input;
 
 }
 
-
-/*
-
-atlas->game command ("initialise now", "render now")
-atlas->game->atlas query ("what is at position (x,y)?")
-game->atlas notification ("game ended")  ??
-
-*/
-
 #endif // MESSAGEPASSER_H__
diff --git a/source/tools/atlas/GameInterface/MessagePasserImpl.cpp b/source/tools/atlas/GameInterface/MessagePasserImpl.cpp
index e9e9453c6f..0f51327857 100644
--- a/source/tools/atlas/GameInterface/MessagePasserImpl.cpp
+++ b/source/tools/atlas/GameInterface/MessagePasserImpl.cpp
@@ -49,12 +49,12 @@ template <typename T> T* MessagePasserImpl<T>::Retrieve()
 	return msg;
 }
 
-template <typename T> void MessagePasserImpl<T>::Query(T&)
-{
-}
-
-template <typename T> void MessagePasserImpl<T>::QueryDone()
+template <typename T> bool MessagePasserImpl<T>::IsEmpty()
 {
+	m_Mutex.Lock();
+	bool empty = m_Queue.empty();
+	m_Mutex.Unlock();
+	return empty;
 }
 
 MessagePasser<mCommand>* g_MessagePasser_Command = NULL;
diff --git a/source/tools/atlas/GameInterface/MessagePasserImpl.h b/source/tools/atlas/GameInterface/MessagePasserImpl.h
index 407ac7f8ec..70496838a2 100644
--- a/source/tools/atlas/GameInterface/MessagePasserImpl.h
+++ b/source/tools/atlas/GameInterface/MessagePasserImpl.h
@@ -8,9 +8,7 @@ template <typename T> class MessagePasserImpl : public AtlasMessage::MessagePass
 public:
 	virtual void Add(T* msg);
 	virtual T* Retrieve();
-
-	virtual void Query(T&);
-	virtual void QueryDone();
+	virtual bool IsEmpty();
 
 private:
 	CMutex m_Mutex;
diff --git a/source/tools/atlas/GameInterface/Messages.h b/source/tools/atlas/GameInterface/Messages.h
index 2fd4ef2d33..4dd55c9dad 100644
--- a/source/tools/atlas/GameInterface/Messages.h
+++ b/source/tools/atlas/GameInterface/Messages.h
@@ -90,9 +90,8 @@ COMMAND(CommandString)
 //////////////////////////////////////////////////////////////////////////
 
 COMMAND(SetContext)
-	mSetContext(void* /* HDC */ hdc_, void* /* HGLRC */ hglrc_) : hdc(hdc_), hglrc(hglrc_) {};
-	const void* hdc;
-	const void* hglrc;
+	mSetContext(void* /* wxGLContext */ context_) : context(context_) {};
+	const void* context;
 };
 
 COMMAND(ResizeScreen)