added actor rendering interpolation; fixed vsync on startup

[d2df-sdl.git] / src / game / g_phys.pas

diff --git a/src/game/g_phys.pas b/src/game/g_phys.pas
index 9d93a5b560ec059d0dc6e5d984103f66acf88d57..af569ea1e1784185f70f13aa5ae47f0ef955fa1d 100644 (file)
--- a/src/game/g_phys.pas
+++ b/src/game/g_phys.pas
@@ -31,6 +31,9 @@ type
     // this is purely visual change, it won't affect anything else
     slopeUpLeft: Integer; // left to go
     slopeFramesLeft: Integer; // frames left to go
+    // for frame interpolation
+    oldX, oldY: Integer;
+    procedure lerp(t: Single; out fX, fY: Integer);
   end;
 
 const
@@ -82,6 +85,11 @@ uses
 const
   SmoothSlopeFrames = 4;
 
+procedure TObj.lerp(t: Single; out fX, fY: Integer);
+begin
+  fX := nlerp(oldX, X, t);
+  fY := nlerp(oldY, Y, t);
+end;
 
 function g_Obj_StayOnStep(Obj: PObj): Boolean; inline;
 begin