Merge drawtowerbackgroundsolo() into drawtowerbackground()

It's less code being copied and pasted, especially since for my
over-30-FPS patch I would have to make a separate function for each if
both of them were still there, but if they're unified into one then I
will only have to make one more function.

And since map.scrolldir is now used outside of GAMEMODE, we'll need to
reset it in hardreset() and when exiting playtesting.

desktop_version/src/Graphics.cpp

@@ -2201,43 +2201,6 @@ void Graphics::drawtowerspikes()
     }
 }
 
-void Graphics::drawtowerbackgroundsolo()
-{
-    if (map.bypos < 0)
-    {
-        map.bypos += 120 * 8;
-    }
-
-    int temp = 0;
-
-    if (map.tdrawback)
-    {
-        //Draw the whole thing; needed for every colour cycle!
-        for (int j = 0; j < 31; j++)
-        {
-            for (int  i = 0; i < 40; i++)
-            {
-                temp = map.tower.backat(i, j, map.bypos);
-                drawtowertile3(i * 8, (j * 8) - (map.bypos % 8), temp, map.colstate);
-            }
-        }
-        SDL_BlitSurface(towerbuffer,NULL, backBuffer,NULL);
-        map.tdrawback = false;
-    }
-    else
-    {
-        //just update the bottom
-        ScrollSurface(towerbuffer,0, -map.bscroll);
-        for (int i = 0; i < 40; i++)
-        {
-            temp = map.tower.backat(i, 0, map.bypos);
-            drawtowertile3(i * 8, -(map.bypos % 8), temp, map.colstate);
-        }
-
-        SDL_BlitSurface(towerbuffer, NULL, backBuffer,NULL);
-    }
-}
-
 void Graphics::drawtowerbackground()
 {
     int temp;
@@ -2248,7 +2211,7 @@ void Graphics::drawtowerbackground()
     {
         int off = map.scrolldir == 0 ? 0 : map.bscroll;
         //Draw the whole thing; needed for every colour cycle!
-        for (j = 0; j < 30; j++)
+        for (int j = 0; j < 31; j++)
         {
             for (int i = 0; i < 40; i++)
             {
@@ -2265,14 +2228,17 @@ void Graphics::drawtowerbackground()
     {
         //just update the bottom
         ScrollSurface(towerbuffer, 0, -map.bscroll);
-        for (int i = 0; i < 40; i++)
+        if (map.scrolldir == 0)
         {
-            if (map.scrolldir == 0)
+            for (int i = 0; i < 40; i++)
             {
                 temp = map.tower.backat(i, 0, map.bypos);
                 drawtowertile3(i * 8, -(map.bypos % 8), temp, map.colstate);
             }
-            else
+        }
+        else
+        {
+            for (int i = 0; i < 40; i++)
             {
                 temp = map.tower.backat(i, 29, map.bypos);
                 drawtowertile3(i * 8, 29*8 - (map.bypos % 8) - map.bscroll, temp, map.colstate);

desktop_version/src/Graphics.h

@@ -185,8 +185,6 @@ public:
 
 	bool onscreen(int t);
 
-	void drawtowerbackgroundsolo();
-
 
 	void menuoffrender();
 

desktop_version/src/Input.cpp

@@ -1556,6 +1556,7 @@ void gameinput()
                        ed.level[i+(j*ed.maxwidth)].warpdir=ed.kludgewarpdir[i+(j*ed.maxwidth)];
                     }
                 }
+                map.scrolldir = 0;
             }
         }
     }

desktop_version/src/Render.cpp

@@ -1069,7 +1069,7 @@ void titlerender()
     }
     else
     {
-        if(!game.colourblindmode) graphics.drawtowerbackgroundsolo();
+        if(!game.colourblindmode) graphics.drawtowerbackground();
 
         tr = map.r - (help.glow / 4) - int(fRandom() * 4);
         tg = map.g - (help.glow / 4) - int(fRandom() * 4);
@@ -1131,7 +1131,7 @@ void gamecompleterender()
 {
     FillRect(graphics.backBuffer, 0x000000);
 
-    if(!game.colourblindmode) graphics.drawtowerbackgroundsolo();
+    if(!game.colourblindmode) graphics.drawtowerbackground();
 
     tr = map.r - (help.glow / 4) - fRandom() * 4;
     tg = map.g - (help.glow / 4) - fRandom() * 4;

desktop_version/src/Script.cpp

@@ -3532,6 +3532,7 @@ void scriptclass::hardreset()
 	map.towermode=false;
 	map.cameraseekframe = 0;
 	map.resumedelay = 0;
+	map.scrolldir = 0;
 	map.customshowmm=true;
 
 	for (j = 0; j < 20; j++)

desktop_version/src/editor.cpp

@@ -3010,7 +3010,7 @@ void editorrender()
     {
         if(!game.colourblindmode)
         {
-            graphics.drawtowerbackgroundsolo();
+            graphics.drawtowerbackground();
         }
         else
         {