text: /*
     Copyright (C) 1999-2006 Id Software, Inc. and contributors.
     For a list of contributors, see the accompanying CONTRIBUTORS file.
  
     This file is part of GtkRadiant.
  
     GtkRadiant is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
  
     GtkRadiant is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with GtkRadiant; if not, write to the Free Software
     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   */
  
  //
  // Camera Window
  //
  // Leonardo Zide (leo@lokigames.com)
  //
  
  #include "camwindow.h"
  
  #include "debugging/debugging.h"
  
  #include "iscenegraph.h"
  #include "irender.h"
  #include "igl.h"
  #include "icamera.h"
  #include "cullable.h"
  #include "renderable.h"
  #include "preferencesystem.h"
  
  #include "signal/signal.h"
  #include "container/array.h"
  #include "scenelib.h"
  #include "render.h"
  #include "cmdlib.h"
  #include "math/frustum.h"
  
  #include "gtkutil/widget.h"
  #include "gtkutil/button.h"
  #include "gtkutil/toolbar.h"
  #include "gtkutil/glwidget.h"
  #include "gtkutil/xorrectangle.h"
  #include "gtkmisc.h"
  #include "selection.h"
  #include "mainframe.h"
  #include "preferences.h"
  #include "commands.h"
  #include "xywindow.h"
  #include "windowobservers.h"
  #include "renderstate.h"
  
  #include "timer.h"
  
  Signal0 g_cameraMoved_callbacks;
  
  void AddCameraMovedCallback( const SignalHandler& handler ){
  	g_cameraMoved_callbacks.connectLast( handler );
  }
  
  void CameraMovedNotify(){
  	g_cameraMoved_callbacks();
  }
  
  
  struct camwindow_globals_private_t
  {
  	int m_nMoveSpeed;
  	bool m_bCamLinkSpeed;
  	int m_nAngleSpeed;
  	bool m_bCamInverseMouse;
  	bool m_bCamDiscrete;
  	bool m_bCubicClipping;
  	bool m_showStats;
  
  	camwindow_globals_private_t() :
  		m_nMoveSpeed( 100 ),
  		m_bCamLinkSpeed( true ),
  		m_nAngleSpeed( 3 ),
  		m_bCamInverseMouse( false ),
  		m_bCamDiscrete( true ),
  		m_bCubicClipping( true ),
  		m_showStats( true )
  	{
  	}
  
  };
  
  camwindow_globals_private_t g_camwindow_globals_private;
  
  
  const Matrix4 g_opengl2radiant(
  	0, 0,-1, 0,
  	-1, 0, 0, 0,
  	0, 1, 0, 0,
  	0, 0, 0, 1
  	);
  
  const Matrix4 g_radiant2opengl(
  	0,-1, 0, 0,
  	0, 0, 1, 0,
  	-1, 0, 0, 0,
  	0, 0, 0, 1
  	);
  
  struct camera_t;
  void Camera_mouseMove( camera_t& camera, int x, int y );
  
  enum camera_draw_mode
  {
  	cd_wire,
  	cd_solid,
  	cd_texture,
  	cd_lighting
  };
  
  struct camera_t
  {
  	int width, height;
  
  	bool timing;
  
  	Vector3 origin;
  	Vector3 angles;
  
  	Vector3 color; // background
  
  	Vector3 forward, right; // move matrix (TTimo: used to have up but it was not updated)
  	Vector3 vup, vpn, vright; // view matrix (taken from the modelview matrix)
  
  	Matrix4 projection;
  	Matrix4 modelview;
  
  	bool m_strafe; // true when in strafemode toggled by the ctrl-key
  	bool m_strafe_forward; // true when in strafemode by ctrl-key and shift is pressed for forward strafing
  
  	unsigned int movementflags; // movement flags
  	Timer m_keycontrol_timer;
  	guint m_keymove_handler;
  
  
  	float fieldOfView;
  
  	DeferredMotionDelta m_mouseMove;
  
  	static void motionDelta( int x, int y, void* data ){
  		Camera_mouseMove( *reinterpret_cast<camera_t*>( data ), x, y );
  	}
  
  	View* m_view;
  	Callback m_update;
  
  	static camera_draw_mode draw_mode;
  
  	camera_t( View * view, const Callback &update )
  		: width( 0 ),
  		height( 0 ),
  		timing( false ),
  		origin( 0, 0, 0 ),
  		angles( 0, 0, 0 ),
  		color( 0, 0, 0 ),
  		movementflags( 0 ),
  		m_keymove_handler( 0 ),
  		fieldOfView( 90.0f ),
  		m_mouseMove( motionDelta, this ),
  		m_view( view ),
  		m_update( update )
  	{
  	}
  };
  
  camera_draw_mode camera_t::draw_mode = cd_texture;
  
  inline Matrix4 projection_for_camera( float near_z, float far_z, float fieldOfView, int width, int height ){
  	const float half_width = static_cast<float>( near_z * tan( degrees_to_radians( fieldOfView * 0.5 ) ) );
  	const float half_height = half_width * ( static_cast<float>( height ) / static_cast<float>( width ) );
  
  	return matrix4_frustum(
  		-half_width,
  		half_width,
  		-half_height,
  		half_height,
  		near_z,
  		far_z
  		);
  }
  
  float Camera_getFarClipPlane( camera_t& camera ){
  	return ( g_camwindow_globals_private.m_bCubicClipping ) ? pow( 2.0, ( g_camwindow_globals.m_nCubicScale + 7 ) / 2.0 ) : 32768.0f;
  }
  
  void Camera_updateProjection( camera_t& camera ){
  	float farClip = Camera_getFarClipPlane( camera );
  	camera.projection = projection_for_camera( farClip / 4096.0f, farClip, camera.fieldOfView, camera.width, camera.height );
  
  	camera.m_view->Construct( camera.projection, camera.modelview, camera.width, camera.height );
  }
  
  void Camera_updateVectors( camera_t& camera ){
  	for ( int i = 0 ; i < 3 ; i++ )
  	{
  		camera.vright[i] = camera.modelview[( i << 2 ) + 0];
  		camera.vup[i] = camera.modelview[( i << 2 ) + 1];
  		camera.vpn[i] = camera.modelview[( i << 2 ) + 2];
  	}
  }
  
  void Camera_updateModelview( camera_t& camera ){
  	camera.modelview = g_matrix4_identity;
  
  	// roll, pitch, yaw
  	Vector3 radiant_eulerXYZ( 0, -camera.angles[CAMERA_PITCH], camera.angles[CAMERA_YAW] );
  
  	matrix4_translate_by_vec3( camera.modelview, camera.origin );
  	matrix4_rotate_by_euler_xyz_degrees( camera.modelview, radiant_eulerXYZ );
  	matrix4_multiply_by_matrix4( camera.modelview, g_radiant2opengl );
  	matrix4_affine_invert( camera.modelview );
  
  	Camera_updateVectors( camera );
  
  	camera.m_view->Construct( camera.projection, camera.modelview, camera.width, camera.height );
  }
  
  
  void Camera_Move_updateAxes( camera_t& camera ){
  	double ya = degrees_to_radians( camera.angles[CAMERA_YAW] );
  
  	// the movement matrix is kept 2d
  	camera.forward[0] = static_cast<float>( cos( ya ) );
  	camera.forward[1] = static_cast<float>( sin( ya ) );
  	camera.forward[2] = 0;
  	camera.right[0] = camera.forward[1];
  	camera.right[1] = -camera.forward[0];
  }
  
  void Camera_Freemove_updateAxes( camera_t& camera ){
  	camera.right = camera.vright;
  	camera.forward = vector3_negated( camera.vpn );
  }
  
  const Vector3& Camera_getOrigin( camera_t& camera ){
  	return camera.origin;
  }
  
  void Camera_setOrigin( camera_t& camera, const Vector3& origin ){
  	camera.origin = origin;
  	Camera_updateModelview( camera );
  	camera.m_update();
  	CameraMovedNotify();
  }
  
  const Vector3& Camera_getAngles( camera_t& camera ){
  	return camera.angles;
  }
  
  void Camera_setAngles( camera_t& camera, const Vector3& angles ){
  	camera.angles = angles;
  	Camera_updateModelview( camera );
  	camera.m_update();
  	CameraMovedNotify();
  }
  
  
  void Camera_FreeMove( camera_t& camera, int dx, int dy ){
  	// free strafe mode, toggled by the ctrl key with optional shift for forward movement
  	if ( camera.m_strafe ) {
  		float strafespeed = 0.65f;
  
  		if ( g_camwindow_globals_private.m_bCamLinkSpeed ) {
  			strafespeed = (float)g_camwindow_globals_private.m_nMoveSpeed / 100;
  		}
  
  		camera.origin -= camera.vright * strafespeed * dx;
  		if ( camera.m_strafe_forward ) {
  			camera.origin += camera.vpn * strafespeed * dy;
  		}
  		else{
  			camera.origin += camera.vup * strafespeed * dy;
  		}
  	}
  	else // free rotation
  	{
  		const float dtime = 0.1f;
  
  		if ( g_camwindow_globals_private.m_bCamInverseMouse ) {
  			camera.angles[CAMERA_PITCH] -= dy * dtime * g_camwindow_globals_private.m_nAngleSpeed;
  		}
  		else{
  			camera.angles[CAMERA_PITCH] += dy * dtime * g_camwindow_globals_private.m_nAngleSpeed;
  		}
  
  		camera.angles[CAMERA_YAW] += dx * dtime * g_camwindow_globals_private.m_nAngleSpeed;
  
  		if ( camera.angles[CAMERA_PITCH] > 90 ) {
  			camera.angles[CAMERA_PITCH] = 90;
  		}
  		else if ( camera.angles[CAMERA_PITCH] < -90 ) {
  			camera.angles[CAMERA_PITCH] = -90;
  		}
  
  		if ( camera.angles[CAMERA_YAW] >= 360 ) {
  			camera.angles[CAMERA_YAW] -= 360;
  		}
  		else if ( camera.angles[CAMERA_YAW] <= 0 ) {
  			camera.angles[CAMERA_YAW] += 360;
  		}
  	}
  
  	Camera_updateModelview( camera );
  	Camera_Freemove_updateAxes( camera );
  }
  
  void Cam_MouseControl( camera_t& camera, int x, int y ){
  	int xl, xh;
  	int yl, yh;
  	float xf, yf;
  
  	xf = (float)( x - camera.width / 2 ) / ( camera.width / 2 );
  	yf = (float)( y - camera.height / 2 ) / ( camera.height / 2 );
  
  	xl = camera.width / 3;
  	xh = xl * 2;
  	yl = camera.height / 3;
  	yh = yl * 2;
  
  	xf *= 1.0f - fabsf( yf );
  	if ( xf < 0 ) {
  		xf += 0.1f;
  		if ( xf > 0 ) {
  			xf = 0;
  		}
  	}
  	else
  	{
  		xf -= 0.1f;
  		if ( xf < 0 ) {
  			xf = 0;
  		}
  	}
  
  	vector3_add( camera.origin, vector3_scaled( camera.forward, yf * 0.1f * g_camwindow_globals_private.m_nMoveSpeed ) );
  	camera.angles[CAMERA_YAW] += xf * -0.1f * g_camwindow_globals_private.m_nAngleSpeed;
  
  	Camera_updateModelview( camera );
  }
  
  void Camera_mouseMove( camera_t& camera, int x, int y ){
  	//globalOutputStream() << "mousemove... ";
  	Camera_FreeMove( camera, -x, -y );
  	camera.m_update();
  	CameraMovedNotify();
  }
  
  //const unsigned int MOVE_NONE = 0;
  const unsigned int MOVE_FORWARD = 1 << 0;
  const unsigned int MOVE_BACK = 1 << 1;
  const unsigned int MOVE_ROTRIGHT = 1 << 2;
  const unsigned int MOVE_ROTLEFT = 1 << 3;
  const unsigned int MOVE_STRAFERIGHT = 1 << 4;
  const unsigned int MOVE_STRAFELEFT = 1 << 5;
  const unsigned int MOVE_UP = 1 << 6;
  const unsigned int MOVE_DOWN = 1 << 7;
  const unsigned int MOVE_PITCHUP = 1 << 8;
  const unsigned int MOVE_PITCHDOWN = 1 << 9;
  const unsigned int MOVE_ALL = MOVE_FORWARD | MOVE_BACK | MOVE_ROTRIGHT | MOVE_ROTLEFT | MOVE_STRAFERIGHT | MOVE_STRAFELEFT | MOVE_UP | MOVE_DOWN | MOVE_PITCHUP | MOVE_PITCHDOWN;
  
  void Cam_KeyControl( camera_t& camera, float dtime ){
  	// Update angles
  	if ( camera.movementflags & MOVE_ROTLEFT ) {
  		camera.angles[CAMERA_YAW] += 15 * dtime * g_camwindow_globals_private.m_nAngleSpeed;
  	}
  	if ( camera.movementflags & MOVE_ROTRIGHT ) {
  		camera.angles[CAMERA_YAW] -= 15 * dtime * g_camwindow_globals_private.m_nAngleSpeed;
  	}
  	if ( camera.movementflags & MOVE_PITCHUP ) {
  		camera.angles[CAMERA_PITCH] += 15 * dtime * g_camwindow_globals_private.m_nAngleSpeed;
  		if ( camera.angles[CAMERA_PITCH] > 90 ) {
  			camera.angles[CAMERA_PITCH] = 90;
  		}
  	}
  	if ( camera.movementflags & MOVE_PITCHDOWN ) {
  		camera.angles[CAMERA_PITCH] -= 15 * dtime * g_camwindow_globals_private.m_nAngleSpeed;
  		if ( camera.angles[CAMERA_PITCH] < -90 ) {
  			camera.angles[CAMERA_PITCH] = -90;
  		}
  	}
  
  	Camera_updateModelview( camera );
  	Camera_Freemove_updateAxes( camera );
  
  	// Update position
  	if ( camera.movementflags & MOVE_FORWARD ) {
  		vector3_add( camera.origin, vector3_scaled( camera.forward, dtime * g_camwindow_globals_private.m_nMoveSpeed ) );
  	}
  	if ( camera.movementflags & MOVE_BACK ) {
  		vector3_add( camera.origin, vector3_scaled( camera.forward, -dtime * g_camwindow_globals_private.m_nMoveSpeed ) );
  	}
  	if ( camera.movementflags & MOVE_STRAFELEFT ) {
  		vector3_add( camera.origin, vector3_scaled( camera.right, -dtime * g_camwindow_globals_private.m_nMoveSpeed ) );
  	}
  	if ( camera.movementflags & MOVE_STRAFERIGHT ) {
  		vector3_add( camera.origin, vector3_scaled( camera.right, dtime * g_camwindow_globals_private.m_nMoveSpeed ) );
  	}
  	if ( camera.movementflags & MOVE_UP ) {
  		vector3_add( camera.origin, vector3_scaled( g_vector3_axis_z, dtime * g_camwindow_globals_private.m_nMoveSpeed ) );
  	}
  	if ( camera.movementflags & MOVE_DOWN ) {
  		vector3_add( camera.origin, vector3_scaled( g_vector3_axis_z, -dtime * g_camwindow_globals_private.m_nMoveSpeed ) );
  	}
  
  	Camera_updateModelview( camera );
  }
  
  void Camera_keyMove( camera_t& camera ){
  	camera.m_mouseMove.flush();
  
  	//globalOutputStream() << "keymove... ";
  	float time_seconds = camera.m_keycontrol_timer.elapsed_msec() / static_cast<float>( msec_per_sec );
  	camera.m_keycontrol_timer.start();
  	if ( time_seconds > 0.05f ) {
  		time_seconds = 0.05f; // 20fps
  	}
  	Cam_KeyControl( camera, time_seconds * 5.0f );
  
  	camera.m_update();
  	CameraMovedNotify();
  }
  
  gboolean camera_keymove( gpointer data ){
  	Camera_keyMove( *reinterpret_cast<camera_t*>( data ) );
  	return TRUE;
  }
  
  void Camera_setMovementFlags( camera_t& camera, unsigned int mask ){
  	if ( ( ~camera.movementflags & mask ) != 0 && camera.movementflags == 0 ) {
  		camera.m_keymove_handler = g_idle_add( camera_keymove, &camera );
  	}
  	camera.movementflags |= mask;
  }
  void Camera_clearMovementFlags( camera_t& camera, unsigned int mask ){
  	if ( ( camera.movementflags & ~mask ) == 0 && camera.movementflags != 0 ) {
  		g_source_remove( camera.m_keymove_handler );
  		camera.m_keymove_handler = 0;
  	}
  	camera.movementflags &= ~mask;
  }
  
  void Camera_MoveForward_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_FORWARD );
  }
  void Camera_MoveForward_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_FORWARD );
  }
  void Camera_MoveBack_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_BACK );
  }
  void Camera_MoveBack_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_BACK );
  }
  
  void Camera_MoveLeft_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_STRAFELEFT );
  }
  void Camera_MoveLeft_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_STRAFELEFT );
  }
  void Camera_MoveRight_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_STRAFERIGHT );
  }
  void Camera_MoveRight_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_STRAFERIGHT );
  }
  
  void Camera_MoveUp_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_UP );
  }
  void Camera_MoveUp_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_UP );
  }
  void Camera_MoveDown_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_DOWN );
  }
  void Camera_MoveDown_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_DOWN );
  }
  
  void Camera_RotateLeft_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_ROTLEFT );
  }
  void Camera_RotateLeft_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_ROTLEFT );
  }
  void Camera_RotateRight_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_ROTRIGHT );
  }
  void Camera_RotateRight_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_ROTRIGHT );
  }
  
  void Camera_PitchUp_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_PITCHUP );
  }
  void Camera_PitchUp_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_PITCHUP );
  }
  void Camera_PitchDown_KeyDown( camera_t& camera ){
  	Camera_setMovementFlags( camera, MOVE_PITCHDOWN );
  }
  void Camera_PitchDown_KeyUp( camera_t& camera ){
  	Camera_clearMovementFlags( camera, MOVE_PITCHDOWN );
  }
  
  
  typedef ReferenceCaller<camera_t, &Camera_MoveForward_KeyDown> FreeMoveCameraMoveForwardKeyDownCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveForward_KeyUp> FreeMoveCameraMoveForwardKeyUpCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveBack_KeyDown> FreeMoveCameraMoveBackKeyDownCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveBack_KeyUp> FreeMoveCameraMoveBackKeyUpCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveLeft_KeyDown> FreeMoveCameraMoveLeftKeyDownCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveLeft_KeyUp> FreeMoveCameraMoveLeftKeyUpCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveRight_KeyDown> FreeMoveCameraMoveRightKeyDownCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveRight_KeyUp> FreeMoveCameraMoveRightKeyUpCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveUp_KeyDown> FreeMoveCameraMoveUpKeyDownCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveUp_KeyUp> FreeMoveCameraMoveUpKeyUpCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveDown_KeyDown> FreeMoveCameraMoveDownKeyDownCaller;
  typedef ReferenceCaller<camera_t, &Camera_MoveDown_KeyUp> FreeMoveCameraMoveDownKeyUpCaller;
  
  
  #define SPEED_MOVE 32
  #define SPEED_TURN 22.5
  #define MIN_CAM_SPEED 10
  #define MAX_CAM_SPEED 610
  #define CAM_SPEED_STEP 50
  
  void Camera_MoveForward_Discrete( camera_t& camera ){
  	Camera_Move_updateAxes( camera );
  	Camera_setOrigin( camera, vector3_added( Camera_getOrigin( camera ), vector3_scaled( camera.forward, SPEED_MOVE ) ) );
  }
  void Camera_MoveBack_Discrete( camera_t& camera ){
  	Camera_Move_updateAxes( camera );
  	Camera_setOrigin( camera, vector3_added( Camera_getOrigin( camera ), vector3_scaled( camera.forward, -SPEED_MOVE ) ) );
  }
  
  void Camera_MoveUp_Discrete( camera_t& camera ){
  	Vector3 origin( Camera_getOrigin(camera) );
  	origin[2] += SPEED_MOVE;
  	Camera_setOrigin( camera, origin );
  }
  void Camera_MoveDown_Discrete( camera_t& camera ){
  	Vector3 origin( Camera_getOrigin(camera) );
  	origin[2] -= SPEED_MOVE;
  	Camera_setOrigin( camera, origin );
  }
  
  void Camera_MoveLeft_Discrete( camera_t& camera ){
  	Camera_Move_updateAxes( camera );
  	Camera_setOrigin( camera, vector3_added( Camera_getOrigin( camera ), vector3_scaled( camera.right, -SPEED_MOVE ) ) );
  }
  void Camera_MoveRight_Discrete( camera_t& camera ){
  	Camera_Move_updateAxes( camera );
  	Camera_setOrigin( camera, vector3_added( Camera_getOrigin( camera ), vector3_scaled( camera.right, SPEED_MOVE ) ) );
  }
  
  void Camera_RotateLeft_Discrete( camera_t& camera ){
  	Vector3 angles( Camera_getAngles(camera) );
  	angles[CAMERA_YAW] += SPEED_TURN;
  	Camera_setAngles( camera, angles );
  }
  void Camera_RotateRight_Discrete( camera_t& camera ){
  	Vector3 angles( Camera_getAngles(camera) );
  	angles[CAMERA_YAW] -= SPEED_TURN;
  	Camera_setAngles( camera, angles );
  }
  
  void Camera_PitchUp_Discrete( camera_t& camera ){
  	Vector3 angles( Camera_getAngles(camera) );
  	angles[CAMERA_PITCH] += SPEED_TURN;
  	if ( angles[CAMERA_PITCH] > 90 ) {
  		angles[CAMERA_PITCH] = 90;
  	}
  	Camera_setAngles( camera, angles );
  }
  void Camera_PitchDown_Discrete( camera_t& camera ){
  	Vector3 angles( Camera_getAngles(camera) );
  	angles[CAMERA_PITCH] -= SPEED_TURN;
  	if ( angles[CAMERA_PITCH] < -90 ) {
  		angles[CAMERA_PITCH] = -90;
  	}
  	Camera_setAngles( camera, angles );
  }
  
  
  class RadiantCameraView : public CameraView
  {
  	camera_t& m_camera;
  	View* m_view;
  	Callback m_update;
  public:
  	RadiantCameraView( camera_t & camera, View * view, const Callback &update ) : m_camera( camera ), m_view( view ), m_update( update )
  	{
  	}
  	void update(){
  		m_view->Construct( m_camera.projection, m_camera.modelview, m_camera.width, m_camera.height );
  		m_update();
  	}
  	void setModelview( const Matrix4& modelview ){
  		m_camera.modelview = modelview;
  		matrix4_multiply_by_matrix4( m_camera.modelview, g_radiant2opengl );
  		matrix4_affine_invert( m_camera.modelview );
  		Camera_updateVectors( m_camera );
  		update();
  	}
  	void setFieldOfView( float fieldOfView ){
  		float farClip = Camera_getFarClipPlane( m_camera );
  		m_camera.projection = projection_for_camera( farClip / 4096.0f, farClip, fieldOfView, m_camera.width, m_camera.height );
  		update();
  	}
  };
  
  
  void Camera_motionDelta( int x, int y, unsigned int state, void* data ){
  	camera_t* cam = reinterpret_cast<camera_t*>( data );
  
  	cam->m_mouseMove.motion_delta( x, y, state );
  	cam->m_strafe = ( state & GDK_CONTROL_MASK ) != 0;
  
  	if ( cam->m_strafe ) {
  		cam->m_strafe_forward = ( state & GDK_SHIFT_MASK ) != 0;
  	}
  	else{
  		cam->m_strafe_forward = false;
  	}
  }
  
  class CamWnd
  {
  	View m_view;
  	camera_t m_Camera;
  	RadiantCameraView m_cameraview;
  #if 0
  	int m_PositionDragCursorX;
  	int m_PositionDragCursorY;
  #endif
  
  	guint m_freemove_handle_focusout;
  
  	static Shader* m_state_select1;
  	static Shader* m_state_select2;
  
  	FreezePointer m_freezePointer;
  
  public:
  	GtkWidget* m_gl_widget;
  	GtkWindow* m_parent;
  
  	SelectionSystemWindowObserver* m_window_observer;
  	XORRectangle m_XORRectangle;
  
  	DeferredDraw m_deferredDraw;
  	DeferredMotion m_deferred_motion;
  
  	guint m_selection_button_press_handler;
  	guint m_selection_button_release_handler;
  	guint m_selection_motion_handler;
  
  	guint m_freelook_button_press_handler;
  
  	guint m_sizeHandler;
  	guint m_exposeHandler;
  
  	CamWnd();
  	~CamWnd();
  
  	bool m_drawing;
  	void queue_draw(){
  		//ASSERT_MESSAGE(!m_drawing, "CamWnd::queue_draw(): called while draw is already in progress");
  		if ( m_drawing ) {
  			return;
  		}
  		//globalOutputStream() << "queue... ";
  		m_deferredDraw.draw();
  	}
  	void draw();
  
  	static void captureStates(){
  		m_state_select1 = GlobalShaderCache().capture( "$CAM_HIGHLIGHT" );
  		m_state_select2 = GlobalShaderCache().capture( "$CAM_OVERLAY" );
  	}
  	static void releaseStates(){
  		GlobalShaderCache().release( "$CAM_HIGHLIGHT" );
  		GlobalShaderCache().release( "$CAM_OVERLAY" );
  	}
  
  	camera_t& getCamera(){
  		return m_Camera;
  	};
  
  	void BenchMark();
  	void Cam_ChangeFloor( bool up );
  
  	void DisableFreeMove();
  	void EnableFreeMove();
  	bool m_bFreeMove;
  
  	CameraView& getCameraView(){
  		return m_cameraview;
  	}
  
  private:
  	void Cam_Draw();
  };
  
  typedef MemberCaller<CamWnd, &CamWnd::queue_draw> CamWndQueueDraw;
  
  Shader* CamWnd::m_state_select1 = 0;
  Shader* CamWnd::m_state_select2 = 0;
  
  CamWnd* NewCamWnd(){
  	return new CamWnd;
  }
  void DeleteCamWnd( CamWnd* camwnd ){
  	delete camwnd;
  }
  
  void CamWnd_constructStatic(){
  	CamWnd::captureStates();
  }
  
  void CamWnd_destroyStatic(){
  	CamWnd::releaseStates();
  }
  
  static CamWnd* g_camwnd = 0;
  
  void GlobalCamera_setCamWnd( CamWnd& camwnd ){
  	g_camwnd = &camwnd;
  }
  
  
  GtkWidget* CamWnd_getWidget( CamWnd& camwnd ){
  	return camwnd.m_gl_widget;
  }
  
  GtkWindow* CamWnd_getParent( CamWnd& camwnd ){
  	return camwnd.m_parent;
  }
  
  ToggleShown g_camera_shown( true );
  
  void CamWnd_setParent( CamWnd& camwnd, GtkWindow* parent ){
  	camwnd.m_parent = parent;
  	g_camera_shown.connect( GTK_WIDGET( camwnd.m_parent ) );
  }
  
  void CamWnd_Update( CamWnd& camwnd ){
  	camwnd.queue_draw();
  }
  
  
  
  camwindow_globals_t g_camwindow_globals;
  
  const Vector3& Camera_getOrigin( CamWnd& camwnd ){
  	return Camera_getOrigin( camwnd.getCamera() );
  }
  
  void Camera_setOrigin( CamWnd& camwnd, const Vector3& origin ){
  	Camera_setOrigin( camwnd.getCamera(), origin );
  }
  
  const Vector3& Camera_getAngles( CamWnd& camwnd ){
  	return Camera_getAngles( camwnd.getCamera() );
  }
  
  void Camera_setAngles( CamWnd& camwnd, const Vector3& angles ){
  	Camera_setAngles( camwnd.getCamera(), angles );
  }
  
  
  // =============================================================================
  // CamWnd class
  
  gboolean enable_freelook_button_press( GtkWidget* widget, GdkEventButton* event, CamWnd* camwnd ){
  	if ( event->type == GDK_BUTTON_PRESS && event->button == 3 ) {
  		camwnd->EnableFreeMove();
  		return TRUE;
  	}
  	return FALSE;
  }
  
  gboolean disable_freelook_button_press( GtkWidget* widget, GdkEventButton* event, CamWnd* camwnd ){
  	if ( event->type == GDK_BUTTON_PRESS && event->button == 3 ) {
  		camwnd->DisableFreeMove();
  		return TRUE;
  	}
  	return FALSE;
  }
  
  #if 0
  gboolean mousecontrol_button_press( GtkWidget* widget, GdkEventButton* event, CamWnd* camwnd ){
  	if ( event->type == GDK_BUTTON_PRESS && event->button == 3 ) {
  		Cam_MouseControl( camwnd->getCamera(), event->x, widget->allocation.height - 1 - event->y );
  	}
  	return FALSE;
  }
  #endif
  
  void camwnd_update_xor_rectangle( CamWnd& self, rect_t area ){
  	if ( GTK_WIDGET_VISIBLE( self.m_gl_widget ) ) {
  		self.m_XORRectangle.set( rectangle_from_area( area.min, area.max, self.getCamera().width, self.getCamera().height ) );
  	}
  }
  
  
  gboolean selection_button_press( GtkWidget* widget, GdkEventButton* event, WindowObserver* observer ){
  	if ( event->type == GDK_BUTTON_PRESS ) {
  		observer->onMouseDown( WindowVector_forDouble( event->x, event->y ), button_for_button( event->button ), modifiers_for_state( event->state ) );
  	}
  	return FALSE;
  }
  
  gboolean selection_button_release( GtkWidget* widget, GdkEventButton* event, WindowObserver* observer ){
  	if ( event->type == GDK_BUTTON_RELEASE ) {
  		observer->onMouseUp( WindowVector_forDouble( event->x, event->y ), button_for_button( event->button ), modifiers_for_state( event->state ) );
  	}
  	return FALSE;
  }
  
  void selection_motion( gdouble x, gdouble y, guint state, void* data ){
  	//globalOutputStream() << "motion... ";
  	reinterpret_cast<WindowObserver*>( data )->onMouseMotion( WindowVector_forDouble( x, y ), modifiers_for_state( state ) );
  }
  
  inline WindowVector windowvector_for_widget_centre( GtkWidget* widget ){
  	return WindowVector( static_cast<float>( widget->allocation.width / 2 ), static_cast<float>( widget->allocation.height / 2 ) );
  }
  
  gboolean selection_button_press_freemove( GtkWidget* widget, GdkEventButton* event, WindowObserver* observer ){
  	if ( event->type == GDK_BUTTON_PRESS ) {
  		observer->onMouseDown( windowvector_for_widget_centre( widget ), button_for_button( event->button ), modifiers_for_state( event->state ) );
  	}
  	return FALSE;
  }
  
  gboolean selection_button_release_freemove( GtkWidget* widget, GdkEventButton* event, WindowObserver* observer ){
  	if ( event->type == GDK_BUTTON_RELEASE ) {
  		observer->onMouseUp( windowvector_for_widget_centre( widget ), button_for_button( event->button ), modifiers_for_state( event->state ) );
  	}
  	return FALSE;
  }
  
  gboolean selection_motion_freemove( GtkWidget *widget, GdkEventMotion *event, WindowObserver* observer ){
  	observer->onMouseMotion( windowvector_for_widget_centre( widget ), modifiers_for_state( event->state ) );
  	return FALSE;
  }
  
  gboolean wheelmove_scroll( GtkWidget* widget, GdkEventScroll* event, CamWnd* camwnd ){
  	if ( event->direction == GDK_SCROLL_UP ) {
  		Camera_Freemove_updateAxes( camwnd->getCamera() );
  		Camera_setOrigin( *camwnd, vector3_added( Camera_getOrigin( *camwnd ), vector3_scaled( camwnd->getCamera().forward, static_cast<float>( g_camwindow_globals_private.m_nMoveSpeed ) ) ) );
  	}
  	else if ( event->direction == GDK_SCROLL_DOWN ) {
  		Camera_Freemove_updateAxes( camwnd->getCamera() );
  		Camera_setOrigin( *camwnd, vector3_added( Camera_getOrigin( *camwnd ), vector3_scaled( camwnd->getCamera().forward, -static_cast<float>( g_camwindow_globals_private.m_nMoveSpeed ) ) ) );
  	}
  
  	return FALSE;
  }
  
  gboolean camera_size_allocate( GtkWidget* widget, GtkAllocation* allocation, CamWnd* camwnd ){
  	camwnd->getCamera().width = allocation->width;
  	camwnd->getCamera().height = allocation->height;
  	Camera_updateProjection( camwnd->getCamera() );
  	camwnd->m_window_observer->onSizeChanged( camwnd->getCamera().width, camwnd->getCamera().height );
  	camwnd->queue_draw();
  	return FALSE;
  }
  
  gboolean camera_expose( GtkWidget* widget, GdkEventExpose* event, gpointer data ){
  	reinterpret_cast<CamWnd*>( data )->draw();
  	return FALSE;
  }
  
  void KeyEvent_connect( const char* name ){
  	const KeyEvent& keyEvent = GlobalKeyEvents_find( name );
  	keydown_accelerators_add( keyEvent.m_accelerator, keyEvent.m_keyDown );
  	keyup_accelerators_add( keyEvent.m_accelerator, keyEvent.m_keyUp );
  }
  
  void KeyEvent_disconnect( const char* name ){
  	const KeyEvent& keyEvent = GlobalKeyEvents_find( name );
  	keydown_accelerators_remove( keyEvent.m_accelerator );
  	keyup_accelerators_remove( keyEvent.m_accelerator );
  }
  
  void CamWnd_registerCommands( CamWnd& camwnd ){
  	GlobalKeyEvents_insert( "CameraForward", Accelerator( GDK_Up ),
  							ReferenceCaller<camera_t, Camera_MoveForward_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_MoveForward_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraBack", Accelerator( GDK_Down ),
  							ReferenceCaller<camera_t, Camera_MoveBack_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_MoveBack_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraLeft", Accelerator( GDK_Left ),
  							ReferenceCaller<camera_t, Camera_RotateLeft_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_RotateLeft_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraRight", Accelerator( GDK_Right ),
  							ReferenceCaller<camera_t, Camera_RotateRight_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_RotateRight_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraStrafeRight", Accelerator( GDK_period ),
  							ReferenceCaller<camera_t, Camera_MoveRight_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_MoveRight_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraStrafeLeft", Accelerator( GDK_comma ),
  							ReferenceCaller<camera_t, Camera_MoveLeft_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_MoveLeft_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraUp", Accelerator( 'D' ),
  							ReferenceCaller<camera_t, Camera_MoveUp_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_MoveUp_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraDown", Accelerator( 'C' ),
  							ReferenceCaller<camera_t, Camera_MoveDown_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_MoveDown_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraAngleDown", Accelerator( 'A' ),
  							ReferenceCaller<camera_t, Camera_PitchDown_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_PitchDown_KeyUp>( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraAngleUp", Accelerator( 'Z' ),
  							ReferenceCaller<camera_t, Camera_PitchUp_KeyDown>( camwnd.getCamera() ),
  							ReferenceCaller<camera_t, Camera_PitchUp_KeyUp>( camwnd.getCamera() )
  							);
  
  	GlobalKeyEvents_insert( "CameraFreeMoveForward", Accelerator( GDK_Up ),
  							FreeMoveCameraMoveForwardKeyDownCaller( camwnd.getCamera() ),
  							FreeMoveCameraMoveForwardKeyUpCaller( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraFreeMoveBack", Accelerator( GDK_Down ),
  							FreeMoveCameraMoveBackKeyDownCaller( camwnd.getCamera() ),
  							FreeMoveCameraMoveBackKeyUpCaller( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraFreeMoveLeft", Accelerator( GDK_Left ),
  							FreeMoveCameraMoveLeftKeyDownCaller( camwnd.getCamera() ),
  							FreeMoveCameraMoveLeftKeyUpCaller( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraFreeMoveRight", Accelerator( GDK_Right ),
  							FreeMoveCameraMoveRightKeyDownCaller( camwnd.getCamera() ),
  							FreeMoveCameraMoveRightKeyUpCaller( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraFreeMoveUp", Accelerator( 'D' ),
  							FreeMoveCameraMoveUpKeyDownCaller( camwnd.getCamera() ),
  							FreeMoveCameraMoveUpKeyUpCaller( camwnd.getCamera() )
  							);
  	GlobalKeyEvents_insert( "CameraFreeMoveDown", Accelerator( 'C' ),
  							FreeMoveCameraMoveDownKeyDownCaller( camwnd.getCamera() ),
  							FreeMoveCameraMoveDownKeyUpCaller( camwnd.getCamera() )
  							);
  
  	GlobalCommands_insert( "CameraForward", ReferenceCaller<camera_t, Camera_MoveForward_Discrete>( camwnd.getCamera() ), Accelerator( GDK_Up ) );
  	GlobalCommands_insert( "CameraBack", ReferenceCaller<camera_t, Camera_MoveBack_Discrete>( camwnd.getCamera() ), Accelerator( GDK_Down ) );
  	GlobalCommands_insert( "CameraLeft", ReferenceCaller<camera_t, Camera_RotateLeft_Discrete>( camwnd.getCamera() ), Accelerator( GDK_Left ) );
  	GlobalCommands_insert( "CameraRight", ReferenceCaller<camera_t, Camera_RotateRight_Discrete>( camwnd.getCamera() ), Accelerator( GDK_Right ) );
  	GlobalCommands_insert( "CameraStrafeRight", ReferenceCaller<camera_t, Camera_MoveRight_Discrete>( camwnd.getCamera() ), Accelerator( GDK_period ) );
  	GlobalCommands_insert( "CameraStrafeLeft", ReferenceCaller<camera_t, Camera_MoveLeft_Discrete>( camwnd.getCamera() ), Accelerator( GDK_comma ) );
  
  	GlobalCommands_insert( "CameraUp", ReferenceCaller<camera_t, Camera_MoveUp_Discrete>( camwnd.getCamera() ), Accelerator( 'D' ) );
  	GlobalCommands_insert( "CameraDown", ReferenceCaller<camera_t, Camera_MoveDown_Discrete>( camwnd.getCamera() ), Accelerator( 'C' ) );
  	GlobalCommands_insert( "CameraAngleUp", ReferenceCaller<camera_t, Camera_PitchUp_Discrete>( camwnd.getCamera() ), Accelerator( 'A' ) );
  	GlobalCommands_insert( "CameraAngleDown", ReferenceCaller<camera_t, Camera_PitchDown_Discrete>( camwnd.getCamera() ), Accelerator( 'Z' ) );
  }
  
  void CamWnd_Move_Enable( CamWnd& camwnd ){
  	KeyEvent_connect( "CameraForward" );
  	KeyEvent_connect( "CameraBack" );
  	KeyEvent_connect( "CameraLeft" );
  	KeyEvent_connect( "CameraRight" );
  	KeyEvent_connect( "CameraStrafeRight" );
  	KeyEvent_connect( "CameraStrafeLeft" );
  	KeyEvent_connect( "CameraUp" );
  	KeyEvent_connect( "CameraDown" );
  	KeyEvent_connect( "CameraAngleUp" );
  	KeyEvent_connect( "CameraAngleDown" );
  }
  
  void CamWnd_Move_Disable( CamWnd& camwnd ){
  	KeyEvent_disconnect( "CameraForward" );
  	KeyEvent_disconnect( "CameraBack" );
  	KeyEvent_disconnect( "CameraLeft" );
  	KeyEvent_disconnect( "CameraRight" );
  	KeyEvent_disconnect( "CameraStrafeRight" );
  	KeyEvent_disconnect( "CameraStrafeLeft" );
  	KeyEvent_disconnect( "CameraUp" );
  	KeyEvent_disconnect( "CameraDown" );
  	KeyEvent_disconnect( "CameraAngleUp" );
  	KeyEvent_disconnect( "CameraAngleDown" );
  }
  
  void CamWnd_Move_Discrete_Enable( CamWnd& camwnd ){
  	command_connect_accelerator( "CameraForward" );
  	command_connect_accelerator( "CameraBack" );
  	command_connect_accelerator( "CameraLeft" );
  	command_connect_accelerator( "CameraRight" );
  	command_connect_accelerator( "CameraStrafeRight" );
  	command_connect_accelerator( "CameraStrafeLeft" );
  	command_connect_accelerator( "CameraUp" );
  	command_connect_accelerator( "CameraDown" );
  	command_connect_accelerator( "CameraAngleUp" );
  	command_connect_accelerator( "CameraAngleDown" );
  }
  
  void CamWnd_Move_Discrete_Disable( CamWnd& camwnd ){
  	command_disconnect_accelerator( "CameraForward" );
  	command_disconnect_accelerator( "CameraBack" );
  	command_disconnect_accelerator( "CameraLeft" );
  	command_disconnect_accelerator( "CameraRight" );
  	command_disconnect_accelerator( "CameraStrafeRight" );
  	command_disconnect_accelerator( "CameraStrafeLeft" );
  	command_disconnect_accelerator( "CameraUp" );
  	command_disconnect_accelerator( "CameraDown" );
  	command_disconnect_accelerator( "CameraAngleUp" );
  	command_disconnect_accelerator( "CameraAngleDown" );
  }
  
  void CamWnd_Move_Discrete_Import( CamWnd& camwnd, bool value ){
  	if ( g_camwindow_globals_private.m_bCamDiscrete ) {
  		CamWnd_Move_Discrete_Disable( camwnd );
  	}
  	else
  	{
  		CamWnd_Move_Disable( camwnd );
  	}
  
  	g_camwindow_globals_private.m_bCamDiscrete = value;
  
  	if ( g_camwindow_globals_private.m_bCamDiscrete ) {
  		CamWnd_Move_Discrete_Enable( camwnd );
  	}
  	else
  	{
  		CamWnd_Move_Enable( camwnd );
  	}
  }
  
  void CamWnd_Move_Discrete_Import( bool value ){
  	if ( g_camwnd != 0 ) {
  		CamWnd_Move_Discrete_Import( *g_camwnd, value );
  	}
  	else
  	{
  		g_camwindow_globals_private.m_bCamDiscrete = value;
  	}
  }
  
  
  
  void CamWnd_Add_Handlers_Move( CamWnd& camwnd ){
  	camwnd.m_selection_button_press_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "button_press_event", G_CALLBACK( selection_button_press ), camwnd.m_window_observer );
  	camwnd.m_selection_button_release_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "button_release_event", G_CALLBACK( selection_button_release ), camwnd.m_window_observer );
  	camwnd.m_selection_motion_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "motion_notify_event", G_CALLBACK( DeferredMotion::gtk_motion ), &camwnd.m_deferred_motion );
  
  	camwnd.m_freelook_button_press_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "button_press_event", G_CALLBACK( enable_freelook_button_press ), &camwnd );
  
  	if ( g_camwindow_globals_private.m_bCamDiscrete ) {
  		CamWnd_Move_Discrete_Enable( camwnd );
  	}
  	else
  	{
  		CamWnd_Move_Enable( camwnd );
  	}
  }
  
  void CamWnd_Remove_Handlers_Move( CamWnd& camwnd ){
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_selection_button_press_handler );
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_selection_button_release_handler );
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_selection_motion_handler );
  
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_freelook_button_press_handler );
  
  	if ( g_camwindow_globals_private.m_bCamDiscrete ) {
  		CamWnd_Move_Discrete_Disable( camwnd );
  	}
  	else
  	{
  		CamWnd_Move_Disable( camwnd );
  	}
  }
  
  void CamWnd_Add_Handlers_FreeMove( CamWnd& camwnd ){
  	camwnd.m_selection_button_press_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "button_press_event", G_CALLBACK( selection_button_press_freemove ), camwnd.m_window_observer );
  	camwnd.m_selection_button_release_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "button_release_event", G_CALLBACK( selection_button_release_freemove ), camwnd.m_window_observer );
  	camwnd.m_selection_motion_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "motion_notify_event", G_CALLBACK( selection_motion_freemove ), camwnd.m_window_observer );
  
  	camwnd.m_freelook_button_press_handler = g_signal_connect( G_OBJECT( camwnd.m_gl_widget ), "button_press_event", G_CALLBACK( disable_freelook_button_press ), &camwnd );
  
  	KeyEvent_connect( "CameraFreeMoveForward" );
  	KeyEvent_connect( "CameraFreeMoveBack" );
  	KeyEvent_connect( "CameraFreeMoveLeft" );
  	KeyEvent_connect( "CameraFreeMoveRight" );
  	KeyEvent_connect( "CameraFreeMoveUp" );
  	KeyEvent_connect( "CameraFreeMoveDown" );
  }
  
  void CamWnd_Remove_Handlers_FreeMove( CamWnd& camwnd ){
  	KeyEvent_disconnect( "CameraFreeMoveForward" );
  	KeyEvent_disconnect( "CameraFreeMoveBack" );
  	KeyEvent_disconnect( "CameraFreeMoveLeft" );
  	KeyEvent_disconnect( "CameraFreeMoveRight" );
  	KeyEvent_disconnect( "CameraFreeMoveUp" );
  	KeyEvent_disconnect( "CameraFreeMoveDown" );
  
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_selection_button_press_handler );
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_selection_button_release_handler );
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_selection_motion_handler );
  
  	g_signal_handler_disconnect( G_OBJECT( camwnd.m_gl_widget ), camwnd.m_freelook_button_press_handler );
  }
  
  CamWnd::CamWnd() :
  	m_view( true ),
  	m_Camera( &m_view, CamWndQueueDraw( *this ) ),
  	m_cameraview( m_Camera, &m_view, ReferenceCaller<CamWnd, CamWnd_Update>( *this ) ),
  	m_gl_widget( glwidget_new( TRUE ) ),
  	m_window_observer( NewWindowObserver() ),
  	m_XORRectangle( m_gl_widget ),
  	m_deferredDraw( WidgetQueueDrawCaller( *m_gl_widget ) ),
  	m_deferred_motion( selection_motion, m_window_observer ),
  	m_selection_button_press_handler( 0 ),
  	m_selection_button_release_handler( 0 ),
  	m_selection_motion_handler( 0 ),
  	m_freelook_button_press_handler( 0 ),
  	m_drawing( false ){
  	m_bFreeMove = false;
  
  	GlobalWindowObservers_add( m_window_observer );
  	GlobalWindowObservers_connectWidget( m_gl_widget );
  
  	m_window_observer->setRectangleDrawCallback( ReferenceCaller1<CamWnd, rect_t, camwnd_update_xor_rectangle>( *this ) );
  	m_window_observer->setView( m_view );
  
  	gtk_widget_ref( m_gl_widget );
  
  	gtk_widget_set_events( m_gl_widget, GDK_DESTROY | GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_SCROLL_MASK );
  	GTK_WIDGET_SET_FLAGS( m_gl_widget, GTK_CAN_FOCUS );
  
  	m_sizeHandler = g_signal_connect( G_OBJECT( m_gl_widget ), "size_allocate", G_CALLBACK( camera_size_allocate ), this );
  	m_exposeHandler = g_signal_connect( G_OBJECT( m_gl_widget ), "expose_event", G_CALLBACK( camera_expose ), this );
  
  	Map_addValidCallback( g_map, DeferredDrawOnMapValidChangedCaller( m_deferredDraw ) );
  
  	CamWnd_registerCommands( *this );
  
  	CamWnd_Add_Handlers_Move( *this );
  
  	g_signal_connect( G_OBJECT( m_gl_widget ), "scroll_event", G_CALLBACK( wheelmove_scroll ), this );
  
  	AddSceneChangeCallback( ReferenceCaller<CamWnd, CamWnd_Update>( *this ) );
  
  	PressedButtons_connect( g_pressedButtons, m_gl_widget );
  }
  
  CamWnd::~CamWnd(){
  	if ( m_bFreeMove ) {
  		DisableFreeMove();
  	}
  
  	CamWnd_Remove_Handlers_Move( *this );
  
  	g_signal_handler_disconnect( G_OBJECT( m_gl_widget ), m_sizeHandler );
  	g_signal_handler_disconnect( G_OBJECT( m_gl_widget ), m_exposeHandler );
  
  	gtk_widget_unref( m_gl_widget );
  
  	m_window_observer->release();
  }
  
  class FloorHeightWalker : public scene::Graph::Walker
  {
  	float m_current;
  	float& m_bestUp;
  	float& m_bestDown;
  public:
  	FloorHeightWalker( float current, float& bestUp, float& bestDown ) :
  		m_current( current ), m_bestUp( bestUp ), m_bestDown( bestDown )
  	{
  		bestUp = g_MaxWorldCoord;
  		bestDown = -g_MaxWorldCoord;
  	}
  	bool pre( const scene::Path& path, scene::Instance& instance ) const {
  		if ( path.top().get().visible()
  			 && Node_isBrush( path.top() ) ) { // this node is a floor
  			const AABB& aabb = instance.worldAABB();
  			float floorHeight = aabb.origin.z() + aabb.extents.z();
  			if ( floorHeight > m_current && floorHeight < m_bestUp ) {
  				m_bestUp = floorHeight;
  			}
  			if ( floorHeight < m_current && floorHeight > m_bestDown ) {
  				m_bestDown = floorHeight;
  			}
  		}
  		return true;
  	}
  };
  
  void CamWnd::Cam_ChangeFloor( bool up ){
  	float current = m_Camera.origin[2] - 48;
  	float bestUp;
  	float bestDown;
  	GlobalSceneGraph().traverse( FloorHeightWalker( current, bestUp, bestDown ) );
  
  	if ( up && bestUp != g_MaxWorldCoord ) {
  		current = bestUp;
  	}
  	if ( !up && bestDown != -g_MaxWorldCoord ) {
  		current = bestDown;
  	}
  
  	m_Camera.origin[2] = current + 48;
  	Camera_updateModelview( getCamera() );
  	CamWnd_Update( *this );
  	CameraMovedNotify();
  }
  
  
  #if 0
  
  // button_press
  Sys_GetCursorPos( &m_PositionDragCursorX, &m_PositionDragCursorY );
  
  // motion
  if ( ( m_bFreeMove && ( buttons == ( RAD_CONTROL | RAD_SHIFT ) ) )
  	 || ( !m_bFreeMove && ( buttons == ( RAD_RBUTTON | RAD_CONTROL ) ) ) ) {
  	Cam_PositionDrag();
  	CamWnd_Update( camwnd );
  	CameraMovedNotify();
  	return;
  }
  
  void CamWnd::Cam_PositionDrag(){
  	int x, y;
  
  	Sys_GetCursorPos( GTK_WINDOW( m_gl_widget ), &x, &y );
  	if ( x != m_PositionDragCursorX || y != m_PositionDragCursorY ) {
  		x -= m_PositionDragCursorX;
  		vector3_add( m_Camera.origin, vector3_scaled( m_Camera.vright, x ) );
  		y -= m_PositionDragCursorY;
  		m_Camera.origin[2] -= y;
  		Camera_updateModelview();
  		CamWnd_Update( camwnd );
  		CameraMovedNotify();
  
  		Sys_SetCursorPos( GTK_WINDOW( m_parent ), m_PositionDragCursorX, m_PositionDragCursorY );
  	}
  }
  #endif
  
  
  // NOTE TTimo if there's an OS-level focus out of the application
  //   then we can release the camera cursor grab
  static gboolean camwindow_freemove_focusout( GtkWidget* widget, GdkEventFocus* event, gpointer data ){
  	reinterpret_cast<CamWnd*>( data )->DisableFreeMove();
  	return FALSE;
  }
  
  void CamWnd::EnableFreeMove(){
  	//globalOutputStream() << "EnableFreeMove\n";
  
  	ASSERT_MESSAGE( !m_bFreeMove, "EnableFreeMove: free-move was already enabled" );
  	m_bFreeMove = true;
  	Camera_clearMovementFlags( getCamera(), MOVE_ALL );
  
  	CamWnd_Remove_Handlers_Move( *this );
  	CamWnd_Add_Handlers_FreeMove( *this );
  
  	gtk_window_set_focus( m_parent, m_gl_widget );
  	m_freemove_handle_focusout = g_signal_connect( G_OBJECT( m_gl_widget ), "focus_out_event", G_CALLBACK( camwindow_freemove_focusout ), this );
  	m_freezePointer.freeze_pointer( m_parent, Camera_motionDelta, &m_Camera );
  
  	CamWnd_Update( *this );
  }
  
  void CamWnd::DisableFreeMove(){
  	//globalOutputStream() << "DisableFreeMove\n";
  
  	ASSERT_MESSAGE( m_bFreeMove, "DisableFreeMove: free-move was not enabled" );
  	m_bFreeMove = false;
  	Camera_clearMovementFlags( getCamera(), MOVE_ALL );
  
  	CamWnd_Remove_Handlers_FreeMove( *this );
  	CamWnd_Add_Handlers_Move( *this );
  
  	m_freezePointer.unfreeze_pointer( m_parent );
  	g_signal_handler_disconnect( G_OBJECT( m_gl_widget ), m_freemove_handle_focusout );
  
  	CamWnd_Update( *this );
  }
  
  
  #include "renderer.h"
  
  class CamRenderer : public Renderer
  {
  	struct state_type
  	{
  		state_type() : m_highlight( 0 ), m_state( 0 ), m_lights( 0 )
  		{
  		}
  		unsigned int m_highlight;
  		Shader* m_state;
  		const LightList* m_lights;
  	};
  
  	std::vector<state_type> m_state_stack;
  	RenderStateFlags m_globalstate;
  	Shader* m_state_select0;
  	Shader* m_state_select1;
  	const Vector3& m_viewer;
  
  public:
  	CamRenderer( RenderStateFlags globalstate, Shader * select0, Shader * select1, const Vector3 &viewer ) :
  		m_globalstate( globalstate ),
  		m_state_select0( select0 ),
  		m_state_select1( select1 ),
  		m_viewer( viewer )
  	{
  		ASSERT_NOTNULL( select0 );
  		ASSERT_NOTNULL( select1 );
  		m_state_stack.push_back( state_type() );
  	}
  
  	void SetState( Shader* state, EStyle style ){
  		ASSERT_NOTNULL( state );
  		if ( style == eFullMaterials ) {
  			m_state_stack.back().m_state = state;
  		}
  	}
  	const EStyle getStyle() const {
  		return eFullMaterials;
  	}
  	void PushState(){
  		m_state_stack.push_back( m_state_stack.back() );
  	}
  	void PopState(){
  		ASSERT_MESSAGE( !m_state_stack.empty(), "popping empty stack" );
  		m_state_stack.pop_back();
  	}
  	void Highlight( EHighlightMode mode, bool bEnable = true ){
  		( bEnable )
  		? m_state_stack.back().m_highlight |= mode
  											  : m_state_stack.back().m_highlight &= ~mode;
  	}
  	void setLights( const LightList& lights ){
  		m_state_stack.back().m_lights = &lights;
  	}
  	void addRenderable( const OpenGLRenderable& renderable, const Matrix4& world ){
  		if ( m_state_stack.back().m_highlight & ePrimitive ) {
  			m_state_select0->addRenderable( renderable, world, m_state_stack.back().m_lights );
  		}
  		if ( m_state_stack.back().m_highlight & eFace ) {
  			m_state_select1->addRenderable( renderable, world, m_state_stack.back().m_lights );
  		}
  
  		m_state_stack.back().m_state->addRenderable( renderable, world, m_state_stack.back().m_lights );
  	}
  
  	void render( const Matrix4& modelview, const Matrix4& projection ){
  		GlobalShaderCache().render( m_globalstate, modelview, projection, m_viewer );
  	}
  };
  
  /*
     ==============
     Cam_Draw
     ==============
   */
  
  void ShowStatsToggle(){
  	g_camwindow_globals_private.m_showStats ^= 1;
  }
  typedef FreeCaller<ShowStatsToggle> ShowStatsToggleCaller;
  
  void ShowStatsExport( const BoolImportCallback& importer ){
  	importer( g_camwindow_globals_private.m_showStats );
  }
  typedef FreeCaller1<const BoolImportCallback&, ShowStatsExport> ShowStatsExportCaller;
  
  ShowStatsExportCaller g_show_stats_caller;
  BoolExportCallback g_show_stats_callback( g_show_stats_caller );
  ToggleItem g_show_stats( g_show_stats_callback );
  
  void CamWnd::Cam_Draw(){
  	glViewport( 0, 0, m_Camera.width, m_Camera.height );
  #if 0
  	GLint viewprt[4];
  	glGetIntegerv( GL_VIEWPORT, viewprt );
  #endif
  
  	// enable depth buffer writes
  	glDepthMask( GL_TRUE );
  
  	Vector3 clearColour( 0, 0, 0 );
  	if ( m_Camera.draw_mode != cd_lighting ) {
  		clearColour = g_camwindow_globals.color_cameraback;
  	}
  
  	glClearColor( clearColour[0], clearColour[1], clearColour[2], 0 );
  	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  
  	extern void Renderer_ResetStats();
  	Renderer_ResetStats();
  	extern void Cull_ResetStats();
  	Cull_ResetStats();
  
  	glMatrixMode( GL_PROJECTION );
  	glLoadMatrixf( reinterpret_cast<const float*>( &m_Camera.projection ) );
  
  	glMatrixMode( GL_MODELVIEW );
  	glLoadMatrixf( reinterpret_cast<const float*>( &m_Camera.modelview ) );
  
  
  	// one directional light source directly behind the viewer
  	{
  		GLfloat inverse_cam_dir[4], ambient[4], diffuse[4]; //, material[4];
  
  		ambient[0] = ambient[1] = ambient[2] = 0.4f;
  		ambient[3] = 1.0f;
  		diffuse[0] = diffuse[1] = diffuse[2] = 0.4f;
  		diffuse[3] = 1.0f;
  		//material[0] = material[1] = material[2] = 0.8f;
  		//material[3] = 1.0f;
  
  		inverse_cam_dir[0] = m_Camera.vpn[0];
  		inverse_cam_dir[1] = m_Camera.vpn[1];
  		inverse_cam_dir[2] = m_Camera.vpn[2];
  		inverse_cam_dir[3] = 0;
  
  		glLightfv( GL_LIGHT0, GL_POSITION, inverse_cam_dir );
  
  		glLightfv( GL_LIGHT0, GL_AMBIENT, ambient );
  		glLightfv( GL_LIGHT0, GL_DIFFUSE, diffuse );
  
  		glEnable( GL_LIGHT0 );
  	}
  
  
  	unsigned int globalstate = RENDER_DEPTHTEST | RENDER_COLOURWRITE | RENDER_DEPTHWRITE | RENDER_ALPHATEST | RENDER_BLEND | RENDER_CULLFACE | RENDER_COLOURARRAY | RENDER_OFFSETLINE | RENDER_POLYGONSMOOTH | RENDER_LINESMOOTH | RENDER_FOG | RENDER_COLOURCHANGE;
  	switch ( m_Camera.draw_mode )
  	{
  	case cd_wire:
  		break;
  	case cd_solid:
  		globalstate |= RENDER_FILL
  					   | RENDER_LIGHTING
  					   | RENDER_SMOOTH
  					   | RENDER_SCALED;
  		break;
  	case cd_texture:
  		globalstate |= RENDER_FILL
  					   | RENDER_LIGHTING
  					   | RENDER_TEXTURE
  					   | RENDER_SMOOTH
  					   | RENDER_SCALED;
  		break;
  	case cd_lighting:
  		globalstate |= RENDER_FILL
  					   | RENDER_LIGHTING
  					   | RENDER_TEXTURE
  					   | RENDER_SMOOTH
  					   | RENDER_SCALED
  					   | RENDER_BUMP
  					   | RENDER_PROGRAM;
  		break;
  	default:
  		globalstate = 0;
  		break;
  	}
  
  	if ( !g_xywindow_globals.m_bNoStipple ) {
  		globalstate |= RENDER_LINESTIPPLE | RENDER_POLYGONSTIPPLE;
  	}
  
  	{
  		CamRenderer renderer( globalstate, m_state_select2, m_state_select1, m_view.getViewer() );
  
  		Scene_Render( renderer, m_view );
  
  		renderer.render( m_Camera.modelview, m_Camera.projection );
  	}
  
  	// prepare for 2d stuff
  	glColor4f( 1, 1, 1, 1 );
  	glDisable( GL_BLEND );
  	glMatrixMode( GL_PROJECTION );
  	glLoadIdentity();
  	glOrtho( 0, (float)m_Camera.width, 0, (float)m_Camera.height, -100, 100 );
  	glScalef( 1, -1, 1 );
  	glTranslatef( 0, -(float)m_Camera.height, 0 );
  	glMatrixMode( GL_MODELVIEW );
  	glLoadIdentity();
  
  	if ( GlobalOpenGL().GL_1_3() ) {
  		glClientActiveTexture( GL_TEXTURE0 );
  		glActiveTexture( GL_TEXTURE0 );
  	}
  
  	glDisableClientState( GL_TEXTURE_COORD_ARRAY );
  	glDisableClientState( GL_NORMAL_ARRAY );
  	glDisableClientState( GL_COLOR_ARRAY );
  
  	glDisable( GL_TEXTURE_2D );
  	glDisable( GL_LIGHTING );
  	glDisable( GL_COLOR_MATERIAL );
  	glDisable( GL_DEPTH_TEST );
  	glColor3f( 1.f, 1.f, 1.f );
  	glLineWidth( 1 );
  
  	// draw the crosshair
  	if ( m_bFreeMove ) {
  		glBegin( GL_LINES );
  		glVertex2f( (float)m_Camera.width / 2.f, (float)m_Camera.height / 2.f + 6 );
  		glVertex2f( (float)m_Camera.width / 2.f, (float)m_Camera.height / 2.f + 2 );
  		glVertex2f( (float)m_Camera.width / 2.f, (float)m_Camera.height / 2.f - 6 );
  		glVertex2f( (float)m_Camera.width / 2.f, (float)m_Camera.height / 2.f - 2 );
  		glVertex2f( (float)m_Camera.width / 2.f + 6, (float)m_Camera.height / 2.f );
  		glVertex2f( (float)m_Camera.width / 2.f + 2, (float)m_Camera.height / 2.f );
  		glVertex2f( (float)m_Camera.width / 2.f - 6, (float)m_Camera.height / 2.f );
  		glVertex2f( (float)m_Camera.width / 2.f - 2, (float)m_Camera.height / 2.f );
  		glEnd();
  	}
  
  	if ( g_camwindow_globals_private.m_showStats ) {
  		glRasterPos3f( 1.0f, static_cast<float>( m_Camera.height ) - 1.0f, 0.0f );
  		extern const char* Renderer_GetStats();
  		GlobalOpenGL().drawString( Renderer_GetStats() );
  
  		glRasterPos3f( 1.0f, static_cast<float>( m_Camera.height ) - 11.0f, 0.0f );
  		extern const char* Cull_GetStats();
  		GlobalOpenGL().drawString( Cull_GetStats() );
  	}
  
  	// bind back to the default texture so that we don't have problems
  	// elsewhere using/modifying texture maps between contexts
  	glBindTexture( GL_TEXTURE_2D, 0 );
  }
  
  void CamWnd::draw(){
  	m_drawing = true;
  
  	//globalOutputStream() << "draw...\n";
  	if ( glwidget_make_current( m_gl_widget ) != FALSE ) {
  		if ( Map_Valid( g_map ) && ScreenUpdates_Enabled() ) {
  			GlobalOpenGL_debugAssertNoErrors();
  			Cam_Draw();
  			GlobalOpenGL_debugAssertNoErrors();
  			//qglFinish();
  
  			m_XORRectangle.set( rectangle_t() );
  		}
  
  		glwidget_swap_buffers( m_gl_widget );
  	}
  
  	m_drawing = false;
  }
  
  void CamWnd::BenchMark(){
  	double dStart = Sys_DoubleTime();
  	for ( int i = 0 ; i < 100 ; i++ )
  	{
  		Vector3 angles;
  		angles[CAMERA_ROLL] = 0;
  		angles[CAMERA_PITCH] = 0;
  		angles[CAMERA_YAW] = static_cast<float>( i * ( 360.0 / 100.0 ) );
  		Camera_setAngles( *this, angles );
  	}
  	double dEnd = Sys_DoubleTime();
  	globalOutputStream() << FloatFormat( dEnd - dStart, 5, 2 ), " seconds\n";
  }
  
  
  void fill_view_camera_menu( GtkMenu* menu ){
  	create_check_menu_item_with_mnemonic( menu, "Camera View", "ToggleCamera" );
  }
  
  void GlobalCamera_ResetAngles(){
  	CamWnd& camwnd = *g_camwnd;
  	Vector3 angles;
  	angles[CAMERA_ROLL] = angles[CAMERA_PITCH] = 0;
  	angles[CAMERA_YAW] = static_cast<float>( 22.5 * floor( ( Camera_getAngles( camwnd )[CAMERA_YAW] + 11 ) / 22.5 ) );
  	Camera_setAngles( camwnd, angles );
  }
  
  void Camera_ChangeFloorUp(){
  	CamWnd& camwnd = *g_camwnd;
  	camwnd.Cam_ChangeFloor( true );
  }
  
  void Camera_ChangeFloorDown(){
  	CamWnd& camwnd = *g_camwnd;
  	camwnd.Cam_ChangeFloor( false );
  }
  
  void Camera_CubeIn(){
  	CamWnd& camwnd = *g_camwnd;
  	g_camwindow_globals.m_nCubicScale--;
  	if ( g_camwindow_globals.m_nCubicScale < 1 ) {
  		g_camwindow_globals.m_nCubicScale = 1;
  	}
  	Camera_updateProjection( camwnd.getCamera() );
  	CamWnd_Update( camwnd );
  	g_pParentWnd->SetGridStatus();
  }
  
  void Camera_CubeOut(){
  	CamWnd& camwnd = *g_camwnd;
  	g_camwindow_globals.m_nCubicScale++;
  	if ( g_camwindow_globals.m_nCubicScale > 23 ) {
  		g_camwindow_globals.m_nCubicScale = 23;
  	}
  	Camera_updateProjection( camwnd.getCamera() );
  	CamWnd_Update( camwnd );
  	g_pParentWnd->SetGridStatus();
  }
  
  bool Camera_GetFarClip(){
  	return g_camwindow_globals_private.m_bCubicClipping;
  }
  
  BoolExportCaller g_getfarclip_caller( g_camwindow_globals_private.m_bCubicClipping );
  ToggleItem g_getfarclip_item( g_getfarclip_caller );
  
  void Camera_SetFarClip( bool value ){
  	CamWnd& camwnd = *g_camwnd;
  	g_camwindow_globals_private.m_bCubicClipping = value;
  	g_getfarclip_item.update();
  	Camera_updateProjection( camwnd.getCamera() );
  	CamWnd_Update( camwnd );
  }
  
  void Camera_ToggleFarClip(){
  	Camera_SetFarClip( !Camera_GetFarClip() );
  }
  
  
  void CamWnd_constructToolbar( GtkToolbar* toolbar ){
  	toolbar_append_toggle_button( toolbar, "Cubic clip the camera view (\\)", "view_cubicclipping.bmp", "ToggleCubicClip" );
  }
  
  void CamWnd_registerShortcuts(){
  	toggle_add_accelerator( "ToggleCubicClip" );
  
  	if ( g_pGameDescription->mGameType == "doom3" || g_pGameDescription->mGameType == "xreal" ) {
  		command_connect_accelerator( "TogglePreview" );
  	}
  
  	command_connect_accelerator( "CameraSpeedInc" );
  	command_connect_accelerator( "CameraSpeedDec" );
  }
  
  
  void GlobalCamera_Benchmark(){
  	CamWnd& camwnd = *g_camwnd;
  	camwnd.BenchMark();
  }
  
  void GlobalCamera_Update(){
  	CamWnd& camwnd = *g_camwnd;
  	CamWnd_Update( camwnd );
  }
  
  camera_draw_mode CamWnd_GetMode(){
  	return camera_t::draw_mode;
  }
  void CamWnd_SetMode( camera_draw_mode mode ){
  	ShaderCache_setBumpEnabled( mode == cd_lighting );
  	camera_t::draw_mode = mode;
  	if ( g_camwnd != 0 ) {
  		CamWnd_Update( *g_camwnd );
  	}
  }
  
  void CamWnd_TogglePreview( void ){
  	// gametype must be doom3 for this function to work
  	// if the gametype is not doom3 something is wrong with the
  	// global command list or somebody else calls this function.
  	ASSERT_MESSAGE( g_pGameDescription->mGameType == "doom3" || g_pGameDescription->mGameType == "xreal", "CamWnd_TogglePreview called although mGameType is not doom3 compatible" );
  
  	// switch between textured and lighting mode
  	CamWnd_SetMode( ( CamWnd_GetMode() == cd_lighting ) ? cd_texture : cd_lighting );
  }
  
  
  CameraModel* g_camera_model = 0;
  
  void CamWnd_LookThroughCamera( CamWnd& camwnd ){
  	if ( g_camera_model != 0 ) {
  		CamWnd_Add_Handlers_Move( camwnd );
  		g_camera_model->setCameraView( 0, Callback() );
  		g_camera_model = 0;
  		Camera_updateModelview( camwnd.getCamera() );
  		Camera_updateProjection( camwnd.getCamera() );
  		CamWnd_Update( camwnd );
  	}
  }
  
  inline CameraModel* Instance_getCameraModel( scene::Instance& instance ){
  	return InstanceTypeCast<CameraModel>::cast( instance );
  }
  
  void CamWnd_LookThroughSelected( CamWnd& camwnd ){
  	if ( g_camera_model != 0 ) {
  		CamWnd_LookThroughCamera( camwnd );
  	}
  
  	if ( GlobalSelectionSystem().countSelected() != 0 ) {
  		scene::Instance& instance = GlobalSelectionSystem().ultimateSelected();
  		CameraModel* cameraModel = Instance_getCameraModel( instance );
  		if ( cameraModel != 0 ) {
  			CamWnd_Remove_Handlers_Move( camwnd );
  			g_camera_model = cameraModel;
  			g_camera_model->setCameraView( &camwnd.getCameraView(), ReferenceCaller<CamWnd, CamWnd_LookThroughCamera>( camwnd ) );
  		}
  	}
  }
  
  void GlobalCamera_LookThroughSelected(){
  	CamWnd_LookThroughSelected( *g_camwnd );
  }
  
  void GlobalCamera_LookThroughCamera(){
  	CamWnd_LookThroughCamera( *g_camwnd );
  }
  
  
  void RenderModeImport( int value ){
  	switch ( value )
  	{
  	case 0:
  		CamWnd_SetMode( cd_wire );
  		break;
  	case 1:
  		CamWnd_SetMode( cd_solid );
  		break;
  	case 2:
  		CamWnd_SetMode( cd_texture );
  		break;
  	case 3:
  		CamWnd_SetMode( cd_lighting );
  		break;
  	default:
  		CamWnd_SetMode( cd_texture );
  	}
  }
  typedef FreeCaller1<int, RenderModeImport> RenderModeImportCaller;
  
  void RenderModeExport( const IntImportCallback& importer ){
  	switch ( CamWnd_GetMode() )
  	{
  	case cd_wire:
  		importer( 0 );
  		break;
  	case cd_solid:
  		importer( 1 );
  		break;
  	case cd_texture:
  		importer( 2 );
  		break;
  	case cd_lighting:
  		importer( 3 );
  		break;
  	}
  }
  typedef FreeCaller1<const IntImportCallback&, RenderModeExport> RenderModeExportCaller;
  
  void Camera_constructPreferences( PreferencesPage& page ){
  	page.appendSlider( "Movement Speed", g_camwindow_globals_private.m_nMoveSpeed, TRUE, 0, 0, 100, MIN_CAM_SPEED, MAX_CAM_SPEED, 1, 10 );
  	page.appendCheckBox( "", "Link strafe speed to movement speed", g_camwindow_globals_private.m_bCamLinkSpeed );
  	page.appendSlider( "Rotation Speed", g_camwindow_globals_private.m_nAngleSpeed, TRUE, 0, 0, 3, 1, 180, 1, 10 );
  	page.appendCheckBox( "", "Invert mouse vertical axis", g_camwindow_globals_private.m_bCamInverseMouse );
  	page.appendCheckBox(
  		"", "Discrete movement",
  		FreeCaller1<bool, CamWnd_Move_Discrete_Import>(),
  		BoolExportCaller( g_camwindow_globals_private.m_bCamDiscrete )
  		);
  	page.appendCheckBox(
  		"", "Enable far-clip plane",
  		FreeCaller1<bool, Camera_SetFarClip>(),
  		BoolExportCaller( g_camwindow_globals_private.m_bCubicClipping )
  		);
  
  	if ( g_pGameDescription->mGameType == "doom3" || g_pGameDescription->mGameType == "xreal" ) {
  		const char* render_mode[] = { "Wireframe", "Flatshade", "Textured", "Lighting" };
  
  		page.appendCombo(
  			"Render Mode",
  			STRING_ARRAY_RANGE( render_mode ),
  			IntImportCallback( RenderModeImportCaller() ),
  			IntExportCallback( RenderModeExportCaller() )
  			);
  	}
  	else
  	{
  		const char* render_mode[] = { "Wireframe", "Flatshade", "Textured" };
  
  		page.appendCombo(
  			"Render Mode",
  			STRING_ARRAY_RANGE( render_mode ),
  			IntImportCallback( RenderModeImportCaller() ),
  			IntExportCallback( RenderModeExportCaller() )
  			);
  	}
  }
  void Camera_constructPage( PreferenceGroup& group ){
  	PreferencesPage page( group.createPage( "Camera", "Camera View Preferences" ) );
  	Camera_constructPreferences( page );
  }
  void Camera_registerPreferencesPage(){
  	PreferencesDialog_addSettingsPage( FreeCaller1<PreferenceGroup&, Camera_constructPage>() );
  }
  
  #include "preferencesystem.h"
  #include "stringio.h"
  #include "dialog.h"
  
  typedef FreeCaller1<bool, CamWnd_Move_Discrete_Import> CamWndMoveDiscreteImportCaller;
  
  void CameraSpeed_increase(){
  	if ( g_camwindow_globals_private.m_nMoveSpeed <= ( MAX_CAM_SPEED - CAM_SPEED_STEP - 10 ) ) {
  		g_camwindow_globals_private.m_nMoveSpeed += CAM_SPEED_STEP;
  	}
  	else {
  		g_camwindow_globals_private.m_nMoveSpeed = MAX_CAM_SPEED - 10;
  	}
  }
  
  void CameraSpeed_decrease(){
  	if ( g_camwindow_globals_private.m_nMoveSpeed >= ( MIN_CAM_SPEED + CAM_SPEED_STEP ) ) {
  		g_camwindow_globals_private.m_nMoveSpeed -= CAM_SPEED_STEP;
  	}
  	else {
  		g_camwindow_globals_private.m_nMoveSpeed = MIN_CAM_SPEED;
  	}
  }
  
  /// \brief Initialisation for things that have the same lifespan as this module.
  void CamWnd_Construct(){
  	GlobalCommands_insert( "CenterView", FreeCaller<GlobalCamera_ResetAngles>(), Accelerator( GDK_End ) );
  
  	GlobalToggles_insert( "ToggleCubicClip", FreeCaller<Camera_ToggleFarClip>(), ToggleItem::AddCallbackCaller( g_getfarclip_item ), Accelerator( '\\', (GdkModifierType)GDK_CONTROL_MASK ) );
  	GlobalCommands_insert( "CubicClipZoomIn", FreeCaller<Camera_CubeIn>(), Accelerator( '[', (GdkModifierType)GDK_CONTROL_MASK ) );
  	GlobalCommands_insert( "CubicClipZoomOut", FreeCaller<Camera_CubeOut>(), Accelerator( ']', (GdkModifierType)GDK_CONTROL_MASK ) );
  
  	GlobalCommands_insert( "UpFloor", FreeCaller<Camera_ChangeFloorUp>(), Accelerator( GDK_Prior ) );
  	GlobalCommands_insert( "DownFloor", FreeCaller<Camera_ChangeFloorDown>(), Accelerator( GDK_Next ) );
  
  	GlobalToggles_insert( "ToggleCamera", ToggleShown::ToggleCaller( g_camera_shown ), ToggleItem::AddCallbackCaller( g_camera_shown.m_item ), Accelerator( 'C', (GdkModifierType)( GDK_SHIFT_MASK | GDK_CONTROL_MASK ) ) );
  	GlobalCommands_insert( "LookThroughSelected", FreeCaller<GlobalCamera_LookThroughSelected>() );
  	GlobalCommands_insert( "LookThroughCamera", FreeCaller<GlobalCamera_LookThroughCamera>() );
  
  	if ( g_pGameDescription->mGameType == "doom3" || g_pGameDescription->mGameType == "xreal" ) {
  		GlobalCommands_insert( "TogglePreview", FreeCaller<CamWnd_TogglePreview>(), Accelerator( GDK_F3 ) );
  	}
  
  	GlobalCommands_insert( "CameraSpeedInc", FreeCaller<CameraSpeed_increase>(), Accelerator( GDK_KP_Add, (GdkModifierType)GDK_SHIFT_MASK ) );
  	GlobalCommands_insert( "CameraSpeedDec", FreeCaller<CameraSpeed_decrease>(), Accelerator( GDK_KP_Subtract, (GdkModifierType)GDK_SHIFT_MASK ) );
  
  	GlobalShortcuts_insert( "CameraForward", Accelerator( GDK_Up ) );
  	GlobalShortcuts_insert( "CameraBack", Accelerator( GDK_Down ) );
  	GlobalShortcuts_insert( "CameraLeft", Accelerator( GDK_Left ) );
  	GlobalShortcuts_insert( "CameraRight", Accelerator( GDK_Right ) );
  	GlobalShortcuts_insert( "CameraStrafeRight", Accelerator( GDK_period ) );
  	GlobalShortcuts_insert( "CameraStrafeLeft", Accelerator( GDK_comma ) );
  
  	GlobalShortcuts_insert( "CameraUp", Accelerator( 'D' ) );
  	GlobalShortcuts_insert( "CameraDown", Accelerator( 'C' ) );
  	GlobalShortcuts_insert( "CameraAngleUp", Accelerator( 'A' ) );
  	GlobalShortcuts_insert( "CameraAngleDown", Accelerator( 'Z' ) );
  
  	GlobalShortcuts_insert( "CameraFreeMoveForward", Accelerator( GDK_Up ) );
  	GlobalShortcuts_insert( "CameraFreeMoveBack", Accelerator( GDK_Down ) );
  	GlobalShortcuts_insert( "CameraFreeMoveLeft", Accelerator( GDK_Left ) );
  	GlobalShortcuts_insert( "CameraFreeMoveRight", Accelerator( GDK_Right ) );
  
  	GlobalToggles_insert( "ShowStats", ShowStatsToggleCaller(), ToggleItem::AddCallbackCaller( g_show_stats ) );
  
  	GlobalPreferenceSystem().registerPreference( "ShowStats", BoolImportStringCaller( g_camwindow_globals_private.m_showStats ), BoolExportStringCaller( g_camwindow_globals_private.m_showStats ) );
  	GlobalPreferenceSystem().registerPreference( "MoveSpeed", IntImportStringCaller( g_camwindow_globals_private.m_nMoveSpeed ), IntExportStringCaller( g_camwindow_globals_private.m_nMoveSpeed ) );
  	GlobalPreferenceSystem().registerPreference( "CamLinkSpeed", BoolImportStringCaller( g_camwindow_globals_private.m_bCamLinkSpeed ), BoolExportStringCaller( g_camwindow_globals_private.m_bCamLinkSpeed ) );
  	GlobalPreferenceSystem().registerPreference( "AngleSpeed", IntImportStringCaller( g_camwindow_globals_private.m_nAngleSpeed ), IntExportStringCaller( g_camwindow_globals_private.m_nAngleSpeed ) );
  	GlobalPreferenceSystem().registerPreference( "CamInverseMouse", BoolImportStringCaller( g_camwindow_globals_private.m_bCamInverseMouse ), BoolExportStringCaller( g_camwindow_globals_private.m_bCamInverseMouse ) );
  	GlobalPreferenceSystem().registerPreference( "CamDiscrete", makeBoolStringImportCallback( CamWndMoveDiscreteImportCaller() ), BoolExportStringCaller( g_camwindow_globals_private.m_bCamDiscrete ) );
  	GlobalPreferenceSystem().registerPreference( "CubicClipping", BoolImportStringCaller( g_camwindow_globals_private.m_bCubicClipping ), BoolExportStringCaller( g_camwindow_globals_private.m_bCubicClipping ) );
  	GlobalPreferenceSystem().registerPreference( "CubicScale", IntImportStringCaller( g_camwindow_globals.m_nCubicScale ), IntExportStringCaller( g_camwindow_globals.m_nCubicScale ) );
  	GlobalPreferenceSystem().registerPreference( "SI_Colors4", Vector3ImportStringCaller( g_camwindow_globals.color_cameraback ), Vector3ExportStringCaller( g_camwindow_globals.color_cameraback ) );
  	GlobalPreferenceSystem().registerPreference( "SI_Colors12", Vector3ImportStringCaller( g_camwindow_globals.color_selbrushes3d ), Vector3ExportStringCaller( g_camwindow_globals.color_selbrushes3d ) );
  	GlobalPreferenceSystem().registerPreference( "CameraRenderMode", makeIntStringImportCallback( RenderModeImportCaller() ), makeIntStringExportCallback( RenderModeExportCaller() ) );
  
  	CamWnd_constructStatic();
  
  	Camera_registerPreferencesPage();
  }
  void CamWnd_Destroy(){
  	CamWnd_destroyStatic();
  }
  