Apply camera changes provided by Jesse Smith to have v0.6 camera option.

Feel free to fix any C++ style issues, this saves you fighting with patch or
can be undone quickly by reverting this single commit.


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@7739 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/config/user_config.hpp

@@ -360,6 +360,9 @@ namespace UserConfigParams
             PARAM_DEFAULT(  IntUserConfigParam(0, "reverse_look_threshold", 
             "If the kart is driving backwards faster than this value,\n"
             "switch automatically to reverse camera (set to 0 to disable).") );
+    PARAM_PREFIX IntUserConfigParam         m_camera_style
+            PARAM_DEFAULT( IntUserConfigParam(1, "camera_style", "Camera Style") );
+
     
     PARAM_PREFIX StringUserConfigParam      m_item_style
             PARAM_DEFAULT(  StringUserConfigParam("items", "item_style", "Name of the .items file to use.") );

src/graphics/camera.cpp

@@ -62,6 +62,13 @@ Camera::Camera(int camera_index, const Kart* kart)
     m_position_speed = 8.0f;
     m_target_speed   = 10.0f;
     m_rotation_range = 0.4f;
+    // TODO: Make this per user too if the one above goes that way.
+    switch(UserConfigParams::m_camera_style)
+    {
+        case 1: m_camera_style = CS_CLASSIC; break;
+        case 0:
+        default: m_camera_style = CS_MODERN; break;
+    }
     reset();
 }   // Camera
 
@@ -339,8 +346,36 @@ void Camera::update(float dt)
     {
     case CM_NORMAL:
         {
-            computeNormalCameraPosition(&wanted_position, &wanted_target);
-            smoothMoveCamera(dt, wanted_position, wanted_target);
+            switch (m_camera_style)
+            {
+            // 0.7 flexible link
+            case CS_MODERN:
+                {
+                   computeNormalCameraPosition(&wanted_position, &wanted_target);
+                   smoothMoveCamera(dt, wanted_position, wanted_target);
+                   break;
+                }
+
+            // More like the 0.6 STK way
+            case CS_CLASSIC:
+                {
+                  // wanted_target.setY(wanted_target.getY()+ 0.75f);
+                  wanted_target.setY(wanted_target.getY()+ 0.30f);
+                  float angle_around = m_kart->getHeading();
+                  float angle_up     = m_kart->getKartProperties()->getCameraBackwardUpAngle()
+                                     - m_kart->getPitch() ;
+                  angle_around += 3.14;   // face forward
+                  wanted_position.setX( sin(angle_around));
+                  wanted_position.setY( sin(angle_up)    );
+                  wanted_position.setZ( cos(angle_around));
+                  wanted_position *= m_distance * 1.5f;
+                  wanted_position += wanted_target;
+                  smoothMoveCamera(dt, wanted_position, wanted_target);
+                  m_camera->setPosition(wanted_position.toIrrVector());
+                  m_camera->setTarget(wanted_target.toIrrVector());
+                  break;
+                }
+            }
             break;
         }
     case CM_FALLING:

src/graphics/camera.hpp

@@ -51,6 +51,11 @@ public:
         CM_FALLING
     };
 
+    enum Style {
+        CS_MODERN,  //!< Flexible link between kart and camera
+        CS_CLASSIC, //!< Fixed position style, like STK v0.6
+    };
+
 private:
     /** The camera scene node. */
     scene::ICameraSceneNode *m_camera;
@@ -97,6 +102,10 @@ private:
 
     /** Velocity of the target of the camera, only used for end camera. */
     core::vector3df m_target_velocity;
+
+    /* Whether we should use the pre-0.7 camera style or the
+     * modern style. Should default to modern. */
+    Style           m_camera_style;
     
     /** A class that stores information about the different end cameras
      *  which can be specified in the scene.xml file. */

src/main.cpp

@@ -247,6 +247,7 @@ void cmdLineHelp (char* invocation)
     "       --gfx=n            Play other graphical effects like impact stars dance,\n"
     "                           water animations or explosions (Enable: 1, Disable: 0).\n"
     "       --weather=n        Show weather effects like rain or snow (0 or 1 as --gfx).\n"
+    "       --camera-style=n   Flexible (0) or hard like v0.6 (1) kart-camera link.\n"
     // should not be used by unaware users:u
     // "  --profile            Enable automatic driven profile mode for 20 seconds.\n"
     // "  --profile=n          Enable automatic driven profile mode for n seconds.\n"
@@ -489,6 +490,11 @@ int handleCmdLine(int argc, char **argv)
         {
             UserConfigParams::m_show_steering_animations = n;
         }
+
+        else if ( sscanf(argv[i], "--camera-style=%d", &n) )
+        {
+            UserConfigParams::m_camera_style = n;
+        }
         else if( (!strcmp(argv[i], "--kart") && i+1<argc ))
         {
             const KartProperties *prop = kart_properties_manager->getKart(argv[i+1]);