Interpolate bringing up and down quit/pause/teleporter screen

Now it's really, really smooth. Except for like the last frame when it
goes down, which I sometimes didn't notice (but maybe it didn't happen
every time due to being lucky on the delta timesteps or something,
whatevs.)

desktop_version/src/Graphics.cpp

@@ -84,6 +84,7 @@ void Graphics::init()
     crewframe = 0;
     crewframedelay = 4;
     menuoffset = 0;
+    oldmenuoffset = 0;
     resumegamemode = false;
 
     //Fading stuff
@@ -2609,6 +2610,7 @@ void Graphics::menuoffrender()
 
 
 
+	int usethisoffset = lerp(oldmenuoffset, menuoffset);
 	if(flipmode)
 	{
 		//	flipmatrix.translate(0, menuoffset);
@@ -2620,7 +2622,7 @@ void Graphics::menuoffrender()
 		BlitSurfaceStandard(tempbufferFlipped, NULL, backBuffer, NULL);
 		SDL_FreeSurface(tempbufferFlipped);
 		SDL_Rect offsetRect;
-		setRect (offsetRect, 0, menuoffset, backBuffer->w ,backBuffer->h);
+		setRect (offsetRect, 0, usethisoffset, backBuffer->w ,backBuffer->h);
 		SDL_Surface* temp = FlipSurfaceVerticle(menubuffer);
 		BlitSurfaceStandard(temp,NULL,backBuffer,&offsetRect);
 		SDL_FreeSurface(temp);
@@ -2631,7 +2633,7 @@ void Graphics::menuoffrender()
 		BlitSurfaceStandard(tempBuffer, NULL, backBuffer, NULL);
 
 		SDL_Rect offsetRect;
-		setRect (offsetRect, 0, menuoffset, backBuffer->w ,backBuffer->h);
+		setRect (offsetRect, 0, usethisoffset, backBuffer->w ,backBuffer->h);
 		BlitSurfaceStandard(menubuffer,NULL,backBuffer,&offsetRect);
 	}
 

desktop_version/src/Graphics.h

@@ -255,6 +255,7 @@ public:
 	bool backgrounddrawn, foregrounddrawn;
 
 	int menuoffset;
+	int oldmenuoffset;
 	bool resumegamemode;
 
 	SDL_Rect warprect;

desktop_version/src/Input.cpp

@@ -1625,7 +1625,12 @@ void gameinput()
                                 //Alright, normal teleporting
                                 game.gamestate = TELEPORTERMODE;
                                 graphics.menuoffset = 240; //actually this should count the roomname
-                                if (map.extrarow) graphics.menuoffset -= 10;
+                                graphics.oldmenuoffset = 240;
+                                if (map.extrarow)
+                                {
+                                    graphics.menuoffset -= 10;
+                                    graphics.oldmenuoffset -= 10;
+                                }
 
                                 BlitSurfaceStandard(graphics.menubuffer,NULL,graphics.backBuffer, NULL);
 
@@ -1681,7 +1686,12 @@ void gameinput()
                         game.menupage = 20; // The Map Page
                         BlitSurfaceStandard(graphics.menubuffer,NULL,graphics.backBuffer, NULL);
                         graphics.menuoffset = 240; //actually this should count the roomname
-                        if (map.extrarow) graphics.menuoffset -= 10;
+                        graphics.oldmenuoffset = 240;
+                        if (map.extrarow)
+                        {
+                            graphics.menuoffset -= 10;
+                            graphics.oldmenuoffset -= 10;
+                        }
                     }
                     else if (game.intimetrial && graphics.fademode==0)
                     {
@@ -1705,7 +1715,12 @@ void gameinput()
                         game.menupage = 0; // The Map Page
                         BlitSurfaceStandard(graphics.menubuffer,NULL,graphics.backBuffer, NULL);
                         graphics.menuoffset = 240; //actually this should count the roomname
-                        if (map.extrarow) graphics.menuoffset -= 10;
+                        graphics.oldmenuoffset = 240;
+                        if (map.extrarow)
+                        {
+                            graphics.menuoffset -= 10;
+                            graphics.oldmenuoffset -= 10;
+                        }
                     }
                 }
 
@@ -1720,7 +1735,12 @@ void gameinput()
 
                     BlitSurfaceStandard(graphics.menubuffer,NULL,graphics.backBuffer, NULL);
                     graphics.menuoffset = 240; //actually this should count the roomname
-                    if (map.extrarow) graphics.menuoffset -= 10;
+                    graphics.oldmenuoffset = 240;
+                    if (map.extrarow)
+                    {
+                        graphics.menuoffset -= 10;
+                        graphics.oldmenuoffset -= 10;
+                    }
                 }
 
                 if (key.keymap[SDLK_r] && game.deathseq<=0)// && map.custommode) //Have fun glitchrunners!

desktop_version/src/Logic.cpp

@@ -40,6 +40,7 @@ void maplogic()
     help.updateglow();
     graphics.updatetextboxes();
 
+    graphics.oldmenuoffset = graphics.menuoffset;
     if (graphics.resumegamemode)
     {
         graphics.menuoffset += 25;

desktop_version/src/Script.cpp

@@ -1277,7 +1277,12 @@ void scriptclass::run()
 					//TODO this draw the teleporter screen. This is a problem. :(
 					game.gamestate = TELEPORTERMODE;
 					graphics.menuoffset = 240; //actually this should count the roomname
-					if (map.extrarow) graphics.menuoffset -= 10;
+					graphics.oldmenuoffset = 240;
+					if (map.extrarow)
+					{
+						graphics.menuoffset -= 10;
+						graphics.oldmenuoffset -= 10;
+					}
 
 					graphics.resumegamemode = false;