From c6db72ff9c26450987ddbafdd5a3b573e17439e2 Mon Sep 17 00:00:00 2001
From: tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>
Date: Tue, 13 May 2008 18:29:58 +0000
Subject: TRelativeTimer added. A replace for the buggy TimeSkip/SkipTime
 stuff. It works like a simple stopwatch.

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@1085 b956fd51-792f-4845-bead-9b4dfca2ff2c
---
 Game/Code/Classes/UTime.pas | 78 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 68 insertions(+), 10 deletions(-)

(limited to 'Game/Code/Classes/UTime.pas')

diff --git a/Game/Code/Classes/UTime.pas b/Game/Code/Classes/UTime.pas
index bd03754d..2acca35c 100644
--- a/Game/Code/Classes/UTime.pas
+++ b/Game/Code/Classes/UTime.pas
@@ -10,8 +10,22 @@ interface
 
 type
   TTime = class
-    constructor Create;
-    function    GetTime: real;
+    public
+      constructor Create;
+      function GetTime(): real;
+  end;
+
+  TRelativeTimer = class
+    private
+      AbsoluteTime: int64;      // system-clock reference time for calculation of CurrentTime
+      RelativeTimeOffset: real;
+      Paused: boolean;
+    public
+      constructor Create;
+      procedure Pause();
+      procedure Resume();
+      function GetTime(): real;
+      procedure SetTime(Time: real);
   end;
 
 procedure CountSkipTimeSet;
@@ -20,7 +34,8 @@ procedure CountMidTime;
 
 var
   USTime      : TTime;
-  
+  VideoBGTimer: TRelativeTimer;
+
   TimeNew     : int64;
   TimeOld     : int64;
   TimeSkip    : real;
@@ -46,12 +61,6 @@ http://www.gamedev.net/community/forums/topic.asp?topic_id=466145&whichpage=1%EE
 *)
 
 
-constructor TTime.Create;
-begin
-  inherited;
-  CountSkipTimeSet;
-end;
-
 procedure CountSkipTimeSet;
 begin
   TimeNew     := SDL_GetTicks();
@@ -70,9 +79,58 @@ begin
   TimeMid     := (TimeMidTemp - TimeNew) / cSDLCorrectionRatio;
 end;
 
+{**
+ * TTime
+ **}
+
+constructor TTime.Create;
+begin
+  inherited;
+  CountSkipTimeSet;
+end;
+
 function TTime.GetTime: real;
 begin
-  Result      := SDL_GetTicks() / cSDLCorrectionRatio;
+  Result := SDL_GetTicks() / cSDLCorrectionRatio;
 end;
 
+{**
+ * TRelativeTimer
+ **}
+
+constructor TRelativeTimer.Create;
+begin
+  inherited;
+  RelativeTimeOffset := 0;
+  AbsoluteTime := SDL_GetTicks();
+  Paused := false;
+end;
+
+procedure TRelativeTimer.Pause();
+begin
+  RelativeTimeOffset := GetTime();
+  Paused := true;
+end;
+
+procedure TRelativeTimer.Resume();
+begin
+  AbsoluteTime := SDL_GetTicks();
+  Paused := false;
+end;
+
+function TRelativeTimer.GetTime: real;
+begin
+  if Paused then
+    Result := RelativeTimeOffset
+  else
+    Result := RelativeTimeOffset + (SDL_GetTicks() - AbsoluteTime) / cSDLCorrectionRatio;
+end;
+
+procedure TRelativeTimer.SetTime(Time: real);
+begin
+  RelativeTimeOffset := Time;
+  AbsoluteTime := SDL_GetTicks();
+end;
+
+
 end.
-- 
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