From daa311cd7f423a2303740a7373a4ace11e5c0628 Mon Sep 17 00:00:00 2001
From: JSaurusRex <jessetonckens@gmail.com>
Date: Wed, 6 Dec 2023 17:32:06 +0100
Subject: [PATCH] ghosts support added (not fully tested)

---
 src/game/client/components/ghost.cpp | 39 +++++++++++++++++++++++++---
 src/game/client/components/ghost.h   |  4 ++-
 2 files changed, 39 insertions(+), 4 deletions(-)

diff --git a/src/game/client/components/ghost.cpp b/src/game/client/components/ghost.cpp
index d15fa52a22b..c790108e72e 100644
--- a/src/game/client/components/ghost.cpp
+++ b/src/game/client/components/ghost.cpp
@@ -153,6 +153,7 @@ void CGhost::AddInfos(const CNetObj_Character *pChar, const CNetObj_DDNetCharact
 		GhostRecorder()->Start(m_aTmpFilename, Client()->GetCurrentMap(), Client()->GetCurrentMapSha256(), m_CurGhost.m_aPlayer);
 
 		GhostRecorder()->WriteData(GHOSTDATA_TYPE_START_TICK, &m_CurGhost.m_StartTick, sizeof(int));
+		GhostRecorder()->WriteData(GHOSTDATA_TYPE_TICKRATE, &m_CurGhost.m_Tickrate, sizeof(int));
 		GhostRecorder()->WriteData(GHOSTDATA_TYPE_SKIN, &m_CurGhost.m_Skin, sizeof(CGhostSkin));
 		for(int i = 0; i < NumTicks; i++)
 			GhostRecorder()->WriteData(GHOSTDATA_TYPE_CHARACTER, m_CurGhost.m_Path.Get(i), sizeof(CGhostCharacter));
@@ -321,8 +322,11 @@ void CGhost::OnRender()
 	{
 		if(Ghost.Empty())
 			continue;
+		
+		float speedDiff = Client()->GameTickSpeed() / (float)Ghost.m_Tickrate;
 
-		int GhostTick = Ghost.m_StartTick + PlaybackTick;
+		int GhostTick = Ghost.m_StartTick + floor(PlaybackTick / speedDiff);
+		int GhostTickUnscaled = Ghost.m_StartTick*speedDiff + PlaybackTick;
 		while(Ghost.m_PlaybackPos >= 0 && Ghost.m_Path.Get(Ghost.m_PlaybackPos)->m_Tick < GhostTick)
 		{
 			if(Ghost.m_PlaybackPos < Ghost.m_Path.Size() - 1)
@@ -346,9 +350,9 @@ void CGhost::OnRender()
 		int TickDiff = Player.m_Tick - Prev.m_Tick;
 		float IntraTick = 0.f;
 		if(TickDiff > 0)
-			IntraTick = (GhostTick - Prev.m_Tick - 1 + Client()->PredIntraGameTick(g_Config.m_ClDummy)) / TickDiff;
+			IntraTick = (GhostTickUnscaled - Prev.m_Tick*speedDiff - speedDiff + Client()->PredIntraGameTick(g_Config.m_ClDummy)) / (TickDiff*speedDiff);
 
-		Player.m_AttackTick += Client()->GameTick(g_Config.m_ClDummy) - GhostTick;
+		Player.m_AttackTick += Client()->GameTick(g_Config.m_ClDummy) - GhostTickUnscaled;
 
 		CTeeRenderInfo *pRenderInfo = &Ghost.m_RenderInfo;
 		CTeeRenderInfo GhostNinjaRenderInfo;
@@ -377,6 +381,25 @@ void CGhost::OnRender()
 			}
 		}
 
+		//convert positions
+		if(Ghost.m_Tickrate <= SERVER_TICK_SPEED && Client()->GameTickSpeed() > SERVER_TICK_SPEED)
+		{
+			Prev.m_X *= 4;
+			Prev.m_Y *= 4;
+
+			Player.m_X *= 4;
+			Player.m_Y *= 4;
+		}
+
+		if(Ghost.m_Tickrate > SERVER_TICK_SPEED && Client()->GameTickSpeed() <= SERVER_TICK_SPEED)
+		{
+			Prev.m_X /= 4;
+			Prev.m_Y /= 4;
+
+			Player.m_X /= 4;
+			Player.m_Y /= 4;
+		}
+
 		m_pClient->m_Players.RenderHook(&Prev, &Player, pRenderInfo, -2, IntraTick);
 		m_pClient->m_Players.RenderHookCollLine(&Prev, &Player, -2, IntraTick);
 		m_pClient->m_Players.RenderPlayer(&Prev, &Player, pRenderInfo, -2, IntraTick);
@@ -414,6 +437,7 @@ void CGhost::StartRecord(int Tick)
 	m_Recording = true;
 	m_CurGhost.Reset();
 	m_CurGhost.m_StartTick = Tick;
+	m_CurGhost.m_Tickrate = Client()->GameTickSpeed();
 
 	const CGameClient::CClientData *pData = &m_pClient->m_aClients[m_pClient->m_Snap.m_LocalClientID];
 	str_copy(m_CurGhost.m_aPlayer, Client()->PlayerName());
@@ -538,6 +562,11 @@ int CGhost::Load(const char *pFilename)
 			if(!GhostLoader()->ReadData(Type, &pGhost->m_StartTick, sizeof(int)))
 				Error = true;
 		}
+		else if(Type == GHOSTDATA_TYPE_TICKRATE)
+		{
+			if(!GhostLoader()->ReadData(Type, &pGhost->m_Tickrate, sizeof(int)))
+				Error = true;
+		}
 	}
 
 	GhostLoader()->Close();
@@ -562,6 +591,9 @@ int CGhost::Load(const char *pFilename)
 	if(pGhost->m_StartTick == -1)
 		pGhost->m_StartTick = pGhost->m_Path.Get(0)->m_Tick;
 
+	if(pGhost->m_Tickrate <= 0)
+		pGhost->m_Tickrate = SERVER_TICK_SPEED;
+
 	if(!FoundSkin)
 		GetGhostSkin(&pGhost->m_Skin, "default", 0, 0, 0);
 	InitRenderInfos(pGhost);
@@ -593,6 +625,7 @@ void CGhost::SaveGhost(CMenus::CGhostItem *pItem)
 	GhostRecorder()->Start(pItem->m_aFilename, Client()->GetCurrentMap(), Client()->GetCurrentMapSha256(), pItem->m_aPlayer);
 
 	GhostRecorder()->WriteData(GHOSTDATA_TYPE_START_TICK, &pGhost->m_StartTick, sizeof(int));
+	GhostRecorder()->WriteData(GHOSTDATA_TYPE_TICKRATE, &pGhost->m_Tickrate, sizeof(int));
 	GhostRecorder()->WriteData(GHOSTDATA_TYPE_SKIN, &pGhost->m_Skin, sizeof(CGhostSkin));
 	for(int i = 0; i < NumTicks; i++)
 		GhostRecorder()->WriteData(GHOSTDATA_TYPE_CHARACTER, pGhost->m_Path.Get(i), sizeof(CGhostCharacter));
diff --git a/src/game/client/components/ghost.h b/src/game/client/components/ghost.h
index 9a6d3867791..f9daf6fc66d 100644
--- a/src/game/client/components/ghost.h
+++ b/src/game/client/components/ghost.h
@@ -16,7 +16,8 @@ enum
 	GHOSTDATA_TYPE_SKIN = 0,
 	GHOSTDATA_TYPE_CHARACTER_NO_TICK,
 	GHOSTDATA_TYPE_CHARACTER,
-	GHOSTDATA_TYPE_START_TICK
+	GHOSTDATA_TYPE_START_TICK,
+	GHOSTDATA_TYPE_TICKRATE
 };
 
 struct CGhostSkin
@@ -91,6 +92,7 @@ class CGhost : public CComponent
 		CGhostSkin m_Skin;
 		CGhostPath m_Path;
 		int m_StartTick;
+		int m_Tickrate;
 		char m_aPlayer[MAX_NAME_LENGTH];
 		int m_PlaybackPos;