Fix rendering glitches when far from the center of the map

1 files changed, 14 insertions, 2 deletions

diff --git a/src/camera.cpp b/src/camera.cpp
index 937ba38af..783ae84c4 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -36,6 +36,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "profiler.h"
 #include "util/numeric.h"
 #include "util/mathconstants.h"
+#include "constants.h"
+
+#define CAMERA_OFFSET_STEP 200
 
 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
 		IGameDef *gamedef):
@@ -53,6 +56,7 @@ Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
 
 	m_camera_position(0,0,0),
 	m_camera_direction(0,0,0),
+	m_camera_offset(0,0,0),
 
 	m_aspect(1.0),
 	m_fov_x(1.0),
@@ -348,11 +352,19 @@ void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 	v3f abs_cam_up;
 	m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 
+	// Update offset if too far away from the center of the map
+	m_camera_offset.X += CAMERA_OFFSET_STEP*
+			(((s16)(m_camera_position.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
+	m_camera_offset.Y += CAMERA_OFFSET_STEP*
+			(((s16)(m_camera_position.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
+	m_camera_offset.Z += CAMERA_OFFSET_STEP*
+			(((s16)(m_camera_position.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
+	
 	// Set camera node transformation
-	m_cameranode->setPosition(m_camera_position);
+	m_cameranode->setPosition(m_camera_position-intToFloat(m_camera_offset, BS));
 	m_cameranode->setUpVector(abs_cam_up);
 	// *100.0 helps in large map coordinates
-	m_cameranode->setTarget(m_camera_position + 100 * m_camera_direction);
+	m_cameranode->setTarget(m_camera_position-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 
 	// Get FOV setting
 	f32 fov_degrees = g_settings->getFloat("fov");