#include "precompiled.h"

#include "GameView.h"

#include "graphics/Camera.h"
#include "graphics/HFTracer.h"
#include "graphics/LightEnv.h"
#include "graphics/Model.h"
#include "graphics/ObjectManager.h"
#include "graphics/Patch.h"
#include "graphics/Terrain.h"
#include "graphics/TextureManager.h"
#include "graphics/Unit.h"
#include "graphics/UnitManager.h"
#include "lib/input.h"
#include "lib/lib.h"
#include "lib/timer.h"
#include "maths/Bound.h"
#include "maths/MathUtil.h"
#include "maths/Matrix3D.h"
#include "maths/Quaternion.h"
#include "ps/ConfigDB.h"
#include "ps/Game.h"
#include "ps/Globals.h"
#include "ps/Hotkey.h"
#include "ps/Interact.h"
#include "ps/Loader.h"
#include "ps/LoaderThunks.h"
#include "ps/Profile.h"
#include "ps/Pyrogenesis.h"
#include "renderer/Renderer.h"
#include "renderer/Renderer.h"
#include "renderer/SkyManager.h"
#include "renderer/WaterManager.h"
#include "simulation/Entity.h"
#include "simulation/EntityOrders.h"
#include "simulation/LOSManager.h"
#include "simulation/Projectile.h"

float g_MaxZoomHeight=350.0f;	//note:  Max terrain height is this minus YMinOffset
float g_YMinOffset=15.0f;


extern int g_xres, g_yres;

static CVector3D cameraBookmarks[10];
static bool bookmarkInUse[10] = { false, false, false, false, false, false, false, false, false, false };
static i8 currentBookmark = -1;

const float CGameView::defaultFOV = DEGTORAD(20.f);
const float CGameView::defaultNear = 1.f;
const float CGameView::defaultFar = 5000.f;

CGameView::CGameView(CGame *pGame):
	m_pGame(pGame),
	m_pWorld(pGame->GetWorld()),
	m_ViewCamera(),
	m_CullCamera(),
	m_LockCullCamera(false),
	m_ViewScrollSpeed(60),
	m_ViewRotateSensitivity(0.002f),
	m_ViewRotateSensitivityKeyboard(1.0f),
	m_ViewRotateAboutTargetSensitivity(0.010f),
	m_ViewRotateAboutTargetSensitivityKeyboard(2.0f),
	m_ViewDragSensitivity(0.5f),
	m_ViewZoomSensitivityWheel(16.0f),
	m_ViewZoomSensitivity(256.0f),
	m_ViewZoomSmoothness(0.02f),
	m_ViewSnapSmoothness(0.02f),
	m_CameraDelta(),
	m_CameraPivot(),
	m_ZoomDelta(0)
{
	SViewPort vp;
	vp.m_X=0;
	vp.m_Y=0;
	vp.m_Width=g_xres;
	vp.m_Height=g_yres;
	m_ViewCamera.SetViewPort(&vp);

	m_ViewCamera.SetProjection (defaultNear, defaultFar, defaultFOV);
	m_ViewCamera.m_Orientation.SetXRotation(DEGTORAD(30));
	m_ViewCamera.m_Orientation.RotateY(DEGTORAD(0));
	m_ViewCamera.m_Orientation.Translate (100, 150, -100);
	m_CullCamera = m_ViewCamera;
	g_Renderer.SetCamera(m_ViewCamera, m_CullCamera);

	m_UnitView=NULL;
	m_UnitAttach=NULL;

	ONCE( ScriptingInit(); );
}

CGameView::~CGameView()
{
	UnloadResources();
}

void CGameView::ScriptingInit()
{
	AddMethod<bool, &CGameView::JSI_StartCustomSelection>("startCustomSelection", 0);
	AddMethod<bool, &CGameView::JSI_EndCustomSelection>("endCustomSelection", 0);
	AddProperty(L"lockCullCamera", &CGameView::m_LockCullCamera);

	CJSObject<CGameView>::ScriptingInit("GameView");
}

int CGameView::Initialize(CGameAttributes* UNUSED(pAttribs))
{
	CFG_GET_SYS_VAL( "view.scroll.speed", Float, m_ViewScrollSpeed );
	CFG_GET_SYS_VAL( "view.rotate.speed", Float, m_ViewRotateSensitivity );
	CFG_GET_SYS_VAL( "view.rotate.keyboard.speed", Float, m_ViewRotateSensitivityKeyboard );
	CFG_GET_SYS_VAL( "view.rotate.abouttarget.speed", Float, m_ViewRotateAboutTargetSensitivity );
	CFG_GET_SYS_VAL( "view.rotate.keyboard.abouttarget.speed", Float, m_ViewRotateAboutTargetSensitivityKeyboard );
	CFG_GET_SYS_VAL( "view.drag.speed", Float, m_ViewDragSensitivity );
	CFG_GET_SYS_VAL( "view.zoom.speed", Float, m_ViewZoomSensitivity );
	CFG_GET_SYS_VAL( "view.zoom.wheel.speed", Float, m_ViewZoomSensitivityWheel );
	CFG_GET_SYS_VAL( "view.zoom.smoothness", Float, m_ViewZoomSmoothness );
	CFG_GET_SYS_VAL( "view.snap.smoothness", Float, m_ViewSnapSmoothness );

	if( ( m_ViewZoomSmoothness < 0.0f ) || ( m_ViewZoomSmoothness > 1.0f ) )
		m_ViewZoomSmoothness = 0.02f;
	if( ( m_ViewSnapSmoothness < 0.0f ) || ( m_ViewSnapSmoothness > 1.0f ) )
		m_ViewSnapSmoothness = 0.02f;

	return 0;
}








void CGameView::RegisterInit(CGameAttributes *pAttribs)
{
	// CGameView init
	RegMemFun1(this, &CGameView::Initialize, pAttribs, L"CGameView init", 1);

	// previously done by CGameView::InitResources
	RegMemFun(g_TexMan.GetSingletonPtr(), &CTextureManager::LoadTerrainTextures, L"LoadTerrainTextures", 60);
	RegMemFun(g_ObjMan.GetSingletonPtr(), &CObjectManager::LoadObjects, L"LoadObjects", 1);
	RegMemFun(g_Renderer.GetSingletonPtr(), &CRenderer::LoadAlphaMaps, L"LoadAlphaMaps", 5);
	RegMemFun(g_Renderer.GetSingletonPtr()->GetWaterManager(), &WaterManager::LoadWaterTextures, L"LoadWaterTextures", 80);
	RegMemFun(g_Renderer.GetSingletonPtr()->GetSkyManager(), &SkyManager::LoadSkyTextures, L"LoadSkyTextures", 15);
}


void CGameView::Render()
{
	if (m_LockCullCamera == false)
		m_CullCamera = m_ViewCamera;
	g_Renderer.SetCamera(m_ViewCamera, m_CullCamera);

	CheckLightEnv();

	MICROLOG(L"render terrain");
	PROFILE_START( "render terrain" );
	RenderTerrain(m_pWorld->GetTerrain());
	PROFILE_END( "render terrain" );
	MICROLOG(L"render models");
	PROFILE_START( "render models" );
	RenderModels(m_pWorld->GetUnitManager(), m_pWorld->GetProjectileManager());
	PROFILE_END( "render models" );
}

void CGameView::RenderTerrain(CTerrain *pTerrain)
{
	CFrustum frustum = m_CullCamera.GetFrustum();
	u32 patchesPerSide=pTerrain->GetPatchesPerSide();
	for (uint j=0; j<patchesPerSide; j++) {
		for (uint i=0; i<patchesPerSide; i++) {
			CPatch* patch=pTerrain->GetPatch(i,j);

			// If the patch is underwater, calculate a bounding box that also contains the water plane
			CBound bounds = patch->GetBounds();
			float waterHeight = g_Renderer.GetWaterManager()->m_WaterHeight + 0.001f;
			if(bounds[1].Y < waterHeight) {
				bounds[1].Y = waterHeight;
			}
			
			if (frustum.IsBoxVisible (CVector3D(0,0,0), bounds)) {
				g_Renderer.Submit(patch);
			}
		}
	}
}

void CGameView::RenderModels(CUnitManager *pUnitMan, CProjectileManager *pProjectileMan)
{
	CFrustum frustum = m_CullCamera.GetFrustum();
	CLOSManager* losMgr = m_pWorld->GetLOSManager();

	const std::vector<CUnit*>& units=pUnitMan->GetUnits();
	for (uint i=0;i<units.size();++i)
	{
		CEntity* ent = units[i]->GetEntity();
		if( ent && !ent->m_visible )
			continue;

		int status = losMgr->GetUnitStatus(units[i], g_Game->GetLocalPlayer());
		CModel* model = units[i]->GetModel();

		model->ValidatePosition();

		if (frustum.IsBoxVisible(CVector3D(0,0,0), model->GetBounds())
			&& status != UNIT_HIDDEN)
		{
			if(units[i] != g_BuildingPlacer.m_actor)
			{
				CColor color;
				if(status == UNIT_VISIBLE)
				{
					color = CColor(1.0f, 1.0f, 1.0f, 1.0f);
				}
				else	// status == UNIT_REMEMBERED
				{
					color = CColor(0.7f, 0.7f, 0.7f, 1.0f);
				}
				model->SetShadingColor(color);
			}

			PROFILE( "submit models" );
			SubmitModelRecursive(model);
		}
	}

	const std::vector<CProjectile*>& projectiles=pProjectileMan->GetProjectiles();
	for (uint i=0;i<projectiles.size();++i)
	{
		CModel* model = projectiles[i]->GetModel();

		model->ValidatePosition();

		const CBound& bound = model->GetBounds();
		CVector3D centre;
		bound.GetCentre(centre);

		if (frustum.IsBoxVisible(CVector3D(0,0,0), bound)
			&& losMgr->GetStatus(centre.X, centre.Z, g_Game->GetLocalPlayer()) & LOS_VISIBLE)
		{
			PROFILE( "submit projectiles" );
			SubmitModelRecursive(projectiles[i]->GetModel());
		}
	}
}


//locks the camera in place
void CGameView::CameraLock(CVector3D Trans, bool smooth)
{
	CTerrain* pTerrain = m_pWorld->GetTerrain();
	float height=pTerrain->getExactGroundLevel(
			m_ViewCamera.m_Orientation._14 + Trans.X, m_ViewCamera.m_Orientation._34 + Trans.Z) +
			g_YMinOffset;
	//is requested position within limits?
	if (m_ViewCamera.m_Orientation._24 + Trans.Y <= g_MaxZoomHeight)
	{
		if( m_ViewCamera.m_Orientation._24 + Trans.Y >= height)
		{
			m_ViewCamera.m_Orientation.Translate(Trans);
		}
		else if (m_ViewCamera.m_Orientation._24 + Trans.Y < height && smooth == true)
		{
			m_ViewCamera.m_Orientation.Translate(Trans);
			m_ViewCamera.m_Orientation._24=height;
		}


	}
}

void CGameView::CameraLock(float x, float y, float z, bool smooth)
{
	CTerrain* pTerrain = m_pWorld->GetTerrain();
	float height = pTerrain->getExactGroundLevel(
			m_ViewCamera.m_Orientation._14 + x, m_ViewCamera.m_Orientation._34 + z) +
			g_YMinOffset;
	//is requested position within limits?
	if (m_ViewCamera.m_Orientation._24 + y <= g_MaxZoomHeight)
	{
		if( m_ViewCamera.m_Orientation._24 + y >= height)
		{
			m_ViewCamera.m_Orientation.Translate(x, y, z);
		}
		else if (m_ViewCamera.m_Orientation._24 + y < height && smooth == true)
		{
			m_ViewCamera.m_Orientation.Translate(x, y, z);
			m_ViewCamera.m_Orientation._24=height;
		}
	}
}


void CGameView::SubmitModelRecursive(CModel* model)
{
	g_Renderer.Submit(model);

	const std::vector<CModel::Prop>& props=model->GetProps();
	for (uint i=0;i<props.size();i++) {
		SubmitModelRecursive(props[i].m_Model);
	}
}

void CGameView::RenderNoCull()
{
	CUnitManager *pUnitMan=m_pWorld->GetUnitManager();
	CTerrain *pTerrain=m_pWorld->GetTerrain();

	if (m_LockCullCamera == false)
		m_CullCamera = m_ViewCamera;
	g_Renderer.SetCamera(m_ViewCamera, m_CullCamera);

	CheckLightEnv();

	uint i,j;
	const std::vector<CUnit*>& units=pUnitMan->GetUnits();
	for (i=0;i<units.size();++i) {
		SubmitModelRecursive(units[i]->GetModel());
	}

	u32 patchesPerSide=pTerrain->GetPatchesPerSide();
	for (j=0; j<patchesPerSide; j++) {
		for (i=0; i<patchesPerSide; i++) {
			CPatch* patch=pTerrain->GetPatch(i,j);
			g_Renderer.Submit(patch);
		}
	}
}

static void MarkUpdateColorRecursive(CModel* model)
{
	model->SetDirty(RENDERDATA_UPDATE_COLOR);

	const std::vector<CModel::Prop>& props = model->GetProps();
	for(uint i = 0; i < props.size(); ++i) {
		MarkUpdateColorRecursive(props[i].m_Model);
	}
}

void CGameView::CheckLightEnv()
{
	if (m_cachedLightEnv == g_LightEnv)
		return;

	m_cachedLightEnv = g_LightEnv;
	CTerrain* pTerrain = m_pWorld->GetTerrain();

	if (!pTerrain)
		return;

	PROFILE("update light env");
	pTerrain->MakeDirty(RENDERDATA_UPDATE_COLOR);

	const std::vector<CUnit*>& units = m_pWorld->GetUnitManager()->GetUnits();
	for(size_t i = 0; i < units.size(); ++i) {
		MarkUpdateColorRecursive(units[i]->GetModel());
	}
}


void CGameView::UnloadResources()
{
	g_ObjMan.UnloadObjects();
	g_TexMan.UnloadTerrainTextures();
	g_Renderer.UnloadAlphaMaps();
	g_Renderer.GetWaterManager()->UnloadWaterTextures();
}


void CGameView::ResetCamera()
{
	// quick hack to return camera home, for screenshots (after alt+tabbing)
	m_ViewCamera.SetProjection (1, 5000, DEGTORAD(20));
	m_ViewCamera.m_Orientation.SetXRotation(DEGTORAD(30));
	m_ViewCamera.m_Orientation.RotateY(DEGTORAD(-45));
	m_ViewCamera.m_Orientation.Translate (100, 150, -100);
}

void CGameView::ResetCameraOrientation()
{

	CVector3D origin = m_ViewCamera.m_Orientation.GetTranslation();
	CVector3D dir = m_ViewCamera.m_Orientation.GetIn();

	CVector3D target = origin + dir * ( ( 50.0f - origin.Y ) / dir.Y );

	target -= CVector3D( -22.474480f, 50.0f, 22.474480f );

	m_ViewCamera.SetProjection (1, 5000, DEGTORAD(20));
	m_ViewCamera.m_Orientation.SetXRotation(DEGTORAD(30));
	m_ViewCamera.m_Orientation.RotateY(DEGTORAD(-45));

	target += CVector3D( 100.0f, 150.0f, -100.0f );

	m_ViewCamera.m_Orientation.Translate( target );
}

void CGameView::RotateAboutTarget()
{
	m_CameraPivot = m_ViewCamera.GetWorldCoordinates();
}

void CGameView::Update(float DeltaTime)
{
	if (!g_app_has_focus)
		return;

	if (m_UnitView)
	{
		m_ViewCamera.m_Orientation.SetYRotation(m_UnitView->m_orientation.Y);
		m_ViewCamera.m_Orientation.Translate(m_UnitViewProp->GetTransform().GetTranslation());
		m_ViewCamera.UpdateFrustum();
		return;
	}

	if (m_UnitAttach)
	{
		CVector3D ToMove = m_UnitAttach->m_position - m_ViewCamera.GetFocus();
		m_ViewCamera.m_Orientation._14 += ToMove.X;
		m_ViewCamera.m_Orientation._34 += ToMove.Z;
		m_ViewCamera.UpdateFrustum();
		return;
	}

	if (m_TrackManager.IsActive())
	{
		if (m_TrackManager.IsPlaying())
		{
			if(!m_TrackManager.Update(DeltaTime))
				ResetCamera();
		}
		return;
	}

	float delta = powf( m_ViewSnapSmoothness, DeltaTime );
	m_ViewCamera.m_Orientation.Translate( m_CameraDelta * ( 1.0f - delta ) );
	m_CameraDelta *= delta;


	// This could be rewritten much more reliably, so it doesn't e.g. accidentally tilt
	// the camera, assuming we know exactly what limits the camera should have.


	// Calculate mouse movement
	static int mouse_last_x = 0;
	static int mouse_last_y = 0;
	int mouse_dx = g_mouse_x - mouse_last_x;
	int mouse_dy = g_mouse_y - mouse_last_y;
	mouse_last_x = g_mouse_x;
	mouse_last_y = g_mouse_y;

	// Miscellaneous vectors
	CVector3D forwards = m_ViewCamera.m_Orientation.GetIn();
	CVector3D rightwards = m_ViewCamera.m_Orientation.GetLeft() * -1.0f; // upwards.Cross(forwards);
	CVector3D upwards( 0.0f, 1.0f, 0.0f );
	// rightwards.Normalize();

	CVector3D forwards_horizontal = forwards;
	forwards_horizontal.Y = 0.0f;
	forwards_horizontal.Normalize();

	if( hotkeys[HOTKEY_CAMERA_ROTATE] || hotkeys[HOTKEY_CAMERA_ROTATE_KEYBOARD] )
	{
		// Ctrl + middle-drag or left-and-right-drag to rotate view

		// Untranslate the camera, so it rotates around the correct point
		CVector3D position = m_ViewCamera.m_Orientation.GetTranslation();
		m_ViewCamera.m_Orientation.Translate(position*-1);

		// Sideways rotation

		float rightways = 0.0f;
		if( hotkeys[HOTKEY_CAMERA_ROTATE] )
			rightways = (float)mouse_dx * m_ViewRotateSensitivity;
		if( hotkeys[HOTKEY_CAMERA_ROTATE_KEYBOARD] )
		{
			if( hotkeys[HOTKEY_CAMERA_LEFT] )
				rightways -= m_ViewRotateSensitivityKeyboard * DeltaTime;
			if( hotkeys[HOTKEY_CAMERA_RIGHT] )
				rightways += m_ViewRotateSensitivityKeyboard * DeltaTime;
		}

		m_ViewCamera.m_Orientation.RotateY( rightways );

		// Up/down rotation

		float upways = 0.0f;
		if( hotkeys[HOTKEY_CAMERA_ROTATE] )
			upways = (float)mouse_dy * m_ViewRotateSensitivity;
		if( hotkeys[HOTKEY_CAMERA_ROTATE_KEYBOARD] )
		{
			if( hotkeys[HOTKEY_CAMERA_UP] )
				upways -= m_ViewRotateSensitivityKeyboard * DeltaTime;
			if( hotkeys[HOTKEY_CAMERA_DOWN] )
				upways += m_ViewRotateSensitivityKeyboard * DeltaTime;
		}

		CQuaternion temp;
		temp.FromAxisAngle(rightwards, upways);

		m_ViewCamera.m_Orientation.Rotate(temp);

		// Retranslate back to the right position
		m_ViewCamera.m_Orientation.Translate(position);

	}
	else if( hotkeys[HOTKEY_CAMERA_ROTATE_ABOUT_TARGET] )
	{
		CVector3D origin = m_ViewCamera.m_Orientation.GetTranslation();
		CVector3D delta = origin - m_CameraPivot;

		CQuaternion rotateH, rotateV; CMatrix3D rotateM;

		// Sideways rotation

		float rightways = (float)mouse_dx * m_ViewRotateAboutTargetSensitivity;

		rotateH.FromAxisAngle( upwards, rightways );

		// Up/down rotation

		float upways = (float)mouse_dy * m_ViewRotateAboutTargetSensitivity;
		rotateV.FromAxisAngle( rightwards, upways );

		rotateH *= rotateV;
		rotateH.ToMatrix( rotateM );

		delta = rotateM.Rotate( delta );

		// Lock the inclination to a rather arbitrary values (for the sake of graphical decency)

		float scan = sqrt( delta.X * delta.X + delta.Z * delta.Z ) / delta.Y;
		if( ( scan >= 0.5f ) )
		{
			// Move the camera to the origin (in preparation for rotation )
			m_ViewCamera.m_Orientation.Translate( origin * -1.0f );

			m_ViewCamera.m_Orientation.Rotate( rotateH );

			// Move the camera back to where it belongs
			m_ViewCamera.m_Orientation.Translate( m_CameraPivot + delta );
		}

	}
	else if( hotkeys[HOTKEY_CAMERA_ROTATE_ABOUT_TARGET_KEYBOARD] )
	{
		// Split up because the keyboard controls use the centre of the screen, not the mouse position.
		CVector3D origin = m_ViewCamera.m_Orientation.GetTranslation();
		CVector3D pivot = m_ViewCamera.GetFocus();
		CVector3D delta = origin - pivot;

		CQuaternion rotateH, rotateV; CMatrix3D rotateM;

		// Sideways rotation

		float rightways = 0.0f;
		if( hotkeys[HOTKEY_CAMERA_LEFT] )
			rightways -= m_ViewRotateAboutTargetSensitivityKeyboard * DeltaTime;
		if( hotkeys[HOTKEY_CAMERA_RIGHT] )
			rightways += m_ViewRotateAboutTargetSensitivityKeyboard * DeltaTime;

		rotateH.FromAxisAngle( upwards, rightways );

		// Up/down rotation

		float upways = 0.0f;
		if( hotkeys[HOTKEY_CAMERA_UP] )
			upways -= m_ViewRotateAboutTargetSensitivityKeyboard * DeltaTime;
		if( hotkeys[HOTKEY_CAMERA_DOWN] )
			upways += m_ViewRotateAboutTargetSensitivityKeyboard * DeltaTime;

		rotateV.FromAxisAngle( rightwards, upways );

		rotateH *= rotateV;
		rotateH.ToMatrix( rotateM );

		delta = rotateM.Rotate( delta );

		// Lock the inclination to a rather arbitrary values (for the sake of graphical decency)

		float scan = sqrt( delta.X * delta.X + delta.Z * delta.Z ) / delta.Y;
		if( ( scan >= 0.5f ) )
		{
			// Move the camera to the origin (in preparation for rotation )
			m_ViewCamera.m_Orientation.Translate( origin * -1.0f );

			m_ViewCamera.m_Orientation.Rotate( rotateH );

			// Move the camera back to where it belongs
			m_ViewCamera.m_Orientation.Translate( pivot + delta );
		}

	}
	else if( hotkeys[HOTKEY_CAMERA_PAN] )
	{
		// Middle-drag to pan
		//keep camera in bounds
			CameraLock(rightwards * (m_ViewDragSensitivity * mouse_dx));
			CameraLock(forwards_horizontal * (-m_ViewDragSensitivity * mouse_dy));
	}

	// Mouse movement
	if( !hotkeys[HOTKEY_CAMERA_ROTATE] && !hotkeys[HOTKEY_CAMERA_ROTATE_ABOUT_TARGET] )
	{
		if (g_mouse_x >= g_xres-2 && g_mouse_x < g_xres)
			CameraLock(rightwards * (m_ViewScrollSpeed * DeltaTime));
		else if (g_mouse_x <= 3 && g_mouse_x >= 0)
			CameraLock(-rightwards * (m_ViewScrollSpeed * DeltaTime));

		if (g_mouse_y >= g_yres-2 && g_mouse_y < g_yres)
			CameraLock(-forwards_horizontal * (m_ViewScrollSpeed * DeltaTime));
		else if (g_mouse_y <= 3 && g_mouse_y >= 0)
			CameraLock(forwards_horizontal * (m_ViewScrollSpeed * DeltaTime));

	}

	// Keyboard movement (added to mouse movement, so you can go faster if you want)

	if( hotkeys[HOTKEY_CAMERA_PAN_KEYBOARD] )
	{
		if( hotkeys[HOTKEY_CAMERA_RIGHT] )
			CameraLock(rightwards * (m_ViewScrollSpeed * DeltaTime));
		if( hotkeys[HOTKEY_CAMERA_LEFT] )
			CameraLock(-rightwards * (m_ViewScrollSpeed * DeltaTime));

		if( hotkeys[HOTKEY_CAMERA_DOWN] )
			CameraLock(-forwards_horizontal * (m_ViewScrollSpeed * DeltaTime));
		if( hotkeys[HOTKEY_CAMERA_UP] )
			CameraLock(forwards_horizontal * (m_ViewScrollSpeed * DeltaTime));

	}

	// Smoothed zooming (move a certain percentage towards the desired zoom distance every frame)
	// Note that scroll wheel zooming is event-based and handled in game_view_handler

	if( hotkeys[HOTKEY_CAMERA_ZOOM_IN] )
		m_ZoomDelta += m_ViewZoomSensitivity*DeltaTime;
	else if( hotkeys[HOTKEY_CAMERA_ZOOM_OUT] )
		m_ZoomDelta -= m_ViewZoomSensitivity*DeltaTime;

	if (fabsf(m_ZoomDelta) > 0.1f) // use a fairly high limit to avoid nasty flickering when zooming
	{
		float zoom_proportion = powf(m_ViewZoomSmoothness, DeltaTime);
		CameraLock(forwards * (m_ZoomDelta * (1.0f-zoom_proportion)), false);
		m_ZoomDelta *= zoom_proportion;
	}

	m_ViewCamera.UpdateFrustum ();
}

void CGameView::ToUnitView(CEntity* target, CModel* prop)
{
	if( !target )
	{
		//prevent previous zooming
		m_ZoomDelta = 0.0f;
		ResetCamera();
		SetCameraTarget( m_UnitView->m_position );
	}
	m_UnitView = target;
	m_UnitViewProp = prop;

}
void CGameView::PushCameraTarget( const CVector3D& target )
{
	// Save the current position
	m_CameraTargets.push_back( m_ViewCamera.m_Orientation.GetTranslation() );
	// And set the camera
	SetCameraTarget( target );
}

void CGameView::SetCameraTarget( const CVector3D& target )
{
	// Maintain the same orientation and level of zoom, if we can
	// (do this by working out the point the camera is looking at, saving
	//  the difference between that position and the camera point, and restoring
	//  that difference to our new target)

	CVector3D CurrentTarget = m_ViewCamera.GetFocus();
	m_CameraDelta = target - CurrentTarget;
}

void CGameView::PopCameraTarget()
{
	m_CameraDelta = m_CameraTargets.back() - m_ViewCamera.m_Orientation.GetTranslation();
	m_CameraTargets.pop_back();
}

InReaction game_view_handler(const SDL_Event* ev)
{
	// put any events that must be processed even if inactive here

	if(!g_app_has_focus || !g_Game)
		return IN_PASS;

	CGameView *pView=g_Game->GetView();

	return pView->HandleEvent(ev);
}

InReaction CGameView::HandleEvent(const SDL_Event* ev)
{
	switch(ev->type)
	{

	case SDL_HOTKEYDOWN:
		switch(ev->user.code)
		{
		case HOTKEY_WIREFRAME:
			if (g_Renderer.GetModelRenderMode() == SOLID)
			{
				g_Renderer.SetTerrainRenderMode(EDGED_FACES);
				g_Renderer.SetModelRenderMode(EDGED_FACES);
			}
			else if (g_Renderer.GetModelRenderMode() == EDGED_FACES)
			{
				g_Renderer.SetTerrainRenderMode(WIREFRAME);
				g_Renderer.SetModelRenderMode(WIREFRAME);
			}
			else
			{
				g_Renderer.SetTerrainRenderMode(SOLID);
				g_Renderer.SetModelRenderMode(SOLID);
			}
			return( IN_HANDLED );

		case HOTKEY_CAMERA_RESET_ORIGIN:
			ResetCamera();
			return( IN_HANDLED );

		case HOTKEY_CAMERA_RESET:
			ResetCameraOrientation();
			return( IN_HANDLED );

		case HOTKEY_CAMERA_ROTATE_ABOUT_TARGET:
			RotateAboutTarget();
			return( IN_HANDLED );

		// Mouse wheel must be treated using events instead of polling,
		// because SDL auto-generates a sequence of mousedown/mouseup events
		// and we never get to see the "down" state inside Update().
		case HOTKEY_CAMERA_ZOOM_WHEEL_IN:
			m_ZoomDelta += m_ViewZoomSensitivityWheel;
			return( IN_HANDLED );

		case HOTKEY_CAMERA_ZOOM_WHEEL_OUT:
			m_ZoomDelta -= m_ViewZoomSensitivityWheel;
			return( IN_HANDLED );

		default:

			if( ( ev->user.code >= HOTKEY_CAMERA_BOOKMARK_0 ) && ( ev->user.code <= HOTKEY_CAMERA_BOOKMARK_9 ) )
			{
				// The above test limits it to 10 bookmarks, so don't worry about overflowing
				i8 id = (i8)( ev->user.code - HOTKEY_CAMERA_BOOKMARK_0 );

				if( hotkeys[HOTKEY_CAMERA_BOOKMARK_SAVE] )
				{
					// Attempt to track the ground we're looking at
					cameraBookmarks[id] = GetCamera()->GetFocus();
					bookmarkInUse[id] = true;
				}
				else if( hotkeys[HOTKEY_CAMERA_BOOKMARK_SNAP] )
				{
					if( bookmarkInUse[id] && ( currentBookmark == -1 ) )
					{
						PushCameraTarget( cameraBookmarks[id] );
						currentBookmark = id;
					}
				}
				else
				{
					if( bookmarkInUse[id] )
						SetCameraTarget( cameraBookmarks[id] );
				}
				return( IN_HANDLED );
			}
		}
	case SDL_HOTKEYUP:
		switch( ev->user.code )
		{
			case HOTKEY_CAMERA_BOOKMARK_SNAP:
				if( currentBookmark != -1 )
					PopCameraTarget();
				currentBookmark = -1;
				break;

			default:
				return( IN_PASS );
		}
		return( IN_HANDLED );
	}

	return IN_PASS;
}

bool CGameView::JSI_StartCustomSelection(
	JSContext* UNUSED(context), uint UNUSED(argc), jsval* UNUSED(argv))
{
	StartCustomSelection();
	return true;
}

bool CGameView::JSI_EndCustomSelection(
	JSContext* UNUSED(context), uint UNUSED(argc), jsval* UNUSED(argv))
{
	ResetInteraction();
	return true;
}