From 2860414a0cad57673093401d2f1dcbb564c72707 Mon Sep 17 00:00:00 2001
From: ikework <ikework@178a84e3-b1eb-0310-8ba1-8eac791a3b58>
Date: Fri, 21 Sep 2007 19:17:48 +0000
Subject: [PATCH] replay:

* interpolation between sampled frames
* restart game works with replay

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@1254 178a84e3-b1eb-0310-8ba1-8eac791a3b58
---
 src/replay_buffers.cpp |  2 +-
 src/replay_player.cpp  | 50 ++++++++++++++++++++++++++++++++++--------
 src/replay_player.hpp  |  4 ++--
 src/world.cpp          | 15 +++++++++++--
 4 files changed, 57 insertions(+), 14 deletions(-)

diff --git a/src/replay_buffers.cpp b/src/replay_buffers.cpp
index f714123c0..e58f981b1 100644
--- a/src/replay_buffers.cpp
+++ b/src/replay_buffers.cpp
@@ -43,7 +43,7 @@ ReplayBuffers::getNewFrame()
     // make sure initialization was called properly
     assert( m_BufferFrame.getNumberObjectsUsed() == m_BufferKartState.getNumberArraysUsed() );
 
-    if( !isHealthy() ) return false;
+    if( !isHealthy() ) return NULL;
 
     ReplayFrame* frame = m_BufferFrame.getNewObject();
     if( !frame ) return NULL;
diff --git a/src/replay_player.cpp b/src/replay_player.cpp
index 1b94bee5a..a325f4e29 100644
--- a/src/replay_player.cpp
+++ b/src/replay_player.cpp
@@ -95,13 +95,13 @@ bool ReplayPlayer::loadReplayHumanReadable( FILE *fd )
     if( !m_ReplayBuffers.loadReplayHumanReadable( fd, number_karts ) ) return false;
 
     m_current_frame_index = 0;
-    updateObjects();
 
     return true;
 }
 
 void ReplayPlayer::showReplayAt( float abs_time )
 {
+    assert( m_ReplayBuffers.getNumberFrames() );
     assert( m_current_frame_index > -1 );
     assert( (size_t)m_current_frame_index < m_ReplayBuffers.getNumberFrames() );
 
@@ -120,17 +120,49 @@ void ReplayPlayer::showReplayAt( float abs_time )
         ++m_current_frame_index;
     }
 
-    updateObjects();
-}
+    frame = m_ReplayBuffers.getFrameAt( m_current_frame_index );
 
-void ReplayPlayer::updateObjects()
-{
-    ReplayFrame const* frame = m_ReplayBuffers.getFrameAt( m_current_frame_index );
-
-    for( size_t k = 0; k < m_Karts.size(); ++k )
+    // interpolate, if we are not at the end
+    if( (m_current_frame_index + 1) < (int)m_ReplayBuffers.getNumberFrames() )
     {
-        m_Karts[ k ].setPosition( frame->p_kart_states[ k ].position );
+        ReplayFrame const* frame_next = m_ReplayBuffers.getFrameAt( m_current_frame_index+1 );
+
+        sgVec3 tmp_v3;
+        float scale;
+        sgCoord pos;
+
+        // calc interpolations for all objects
+        for( size_t k = 0; k < m_Karts.size(); ++k )
+        {
+            // calc distance between next and current frame-position
+            sgCopyVec3( pos.xyz, frame->p_kart_states[k].position.xyz ) ;
+            sgCopyVec3( tmp_v3, frame_next->p_kart_states[k].position.xyz ) ;
+            sgSubVec3( tmp_v3, pos.xyz );
+
+            // calc scale factor based on time between frames
+            assert( frame_next->time > frame->time );
+            assert( frame_next->time != frame->time );
+            scale = (abs_time - frame->time) / (frame_next->time - frame->time);
+            sgScaleVec3( tmp_v3, scale );
+
+            // add interpolated vector
+            sgAddVec3( pos.xyz, tmp_v3 );
+
+            // no orientation-interpolation for starters
+            sgCopyVec3( pos.hpr, frame->p_kart_states[k].position.hpr );
+
+            m_Karts[ k ].setPosition( pos );
+        }
     }
+    else
+    {
+        // replay finished, leave them at last known position
+        for( size_t k = 0; k < m_Karts.size(); ++k )
+        {
+            m_Karts[ k ].setPosition( frame->p_kart_states[ k ].position );
+        }
+    }
+
 }
 
 
diff --git a/src/replay_player.hpp b/src/replay_player.hpp
index e753e04eb..1586ec728 100644
--- a/src/replay_player.hpp
+++ b/src/replay_player.hpp
@@ -70,10 +70,10 @@ public:
 
     bool            loadReplayHumanReadable( FILE *fd );
 
+    // calc state of replay-objects at given time
     void            showReplayAt( float abs_time );
 
-private:
-    void            updateObjects();
+    void            reset()                         { m_current_frame_index = 0; }
 
 private:
     typedef std::vector<ReplayKart>    ReplayKarts;
diff --git a/src/world.cpp b/src/world.cpp
index 8afc449e0..3e1617366 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -213,7 +213,7 @@ World::World(const RaceSetup& raceSetup_) : m_race_setup(raceSetup_)
 		delete m_p_replay_player;
 		m_p_replay_player = NULL;
 	}
-	if( m_p_replay_player ) m_p_replay_player->showReplayAt( m_clock );
+	if( m_p_replay_player ) m_p_replay_player->showReplayAt( 0.0 );
 #endif
 }
 
@@ -419,7 +419,7 @@ void World::update(float delta)
 //-----------------------------------------------------------------------------
 void World::pushReplayFrameData()
 {
-	// we dpnt record the startphase ..
+	// we dont record the startphase ..
 	assert( m_phase != START_PHASE );
 
     ReplayFrame *pFrame = m_replay_recorder.getNewFrame();
@@ -890,6 +890,17 @@ void World::restartRace()
     herring_manager->reset();
     projectile_manager->cleanup();
     race_manager->reset();
+
+#ifdef HAVE_GHOST_REPLAY
+    m_replay_recorder.destroy();
+    m_replay_recorder.initRecorder( m_race_setup.getNumKarts() );
+
+	if( m_p_replay_player ) 
+    {
+        m_p_replay_player->reset();
+        m_p_replay_player->showReplayAt( 0.0 );
+    }
+#endif
 }
 
 //-----------------------------------------------------------------------------