Add VSync graphics option, off by default

This is if you want delta-timesteps to go as quickly as possible. Also
it seems like on Windows this only has an effect in exclusive fullscreen
mode.

desktop_version/src/Game.cpp

@@ -4753,6 +4753,11 @@ void Game::loadstats()
             over30mode = atoi(pText);
         }
 
+        if (pKey == "vsync")
+        {
+            graphics.vsync = atoi(pText);
+        }
+
         if (pKey == "notextoutline")
         {
             graphics.notextoutline = atoi(pText);
@@ -5002,6 +5007,10 @@ void Game::savestats()
     msg->LinkEndChild(doc.NewText(help.String((int) over30mode).c_str()));
     dataNode->LinkEndChild(msg);
 
+    msg = doc.NewElement("vsync");
+    msg->LinkEndChild(doc.NewText(help.String((int) graphics.vsync).c_str()));
+    dataNode->LinkEndChild(msg);
+
     for (size_t i = 0; i < controllerButton_flip.size(); i += 1)
     {
         msg = doc.NewElement("flipButton");
@@ -7075,9 +7084,10 @@ void Game::createmenu( enum Menu::MenuName t, bool samemenu/*= false*/ )
         option("toggle analogue");
         option("toggle mouse");
         option("toggle fps");
+        option("toggle vsync");
         option("return");
-        menuxoff = -50;
-        menuyoff = 8;
+        menuxoff = -85;
+        menuyoff = 0;
         break;
     case Menu::ed_settings:
         option("change description");

desktop_version/src/Graphics.cpp

@@ -139,6 +139,8 @@ void Graphics::init()
     col_tb = 0;
 
     kludgeswnlinewidth = false;
+
+    vsync = false;
 }
 
 int Graphics::font_idx(uint32_t ch) {
@@ -3100,3 +3102,8 @@ Uint32 Graphics::crewcolourreal(int t)
 	}
 	return col_crewcyan;
 }
+
+void Graphics::processVsync()
+{
+	SDL_SetHintWithPriority(SDL_HINT_RENDER_VSYNC, vsync ? "1" : "0", SDL_HINT_OVERRIDE);
+}

desktop_version/src/Graphics.h

@@ -324,6 +324,9 @@ public:
 	bool kludgeswnlinewidth;
 
 	Uint32 crewcolourreal(int t);
+
+	bool vsync;
+	void processVsync();
 };
 
 extern Graphics graphics;

desktop_version/src/Input.cpp

@@ -364,6 +364,13 @@ void menuactionpress()
             game.over30mode = !game.over30mode;
             game.savestats();
             break;
+        case 6:
+            //toggle vsync
+            music.playef(11);
+            graphics.vsync = !graphics.vsync;
+            graphics.processVsync();
+            game.savestats();
+            break;
         default:
             //back
             music.playef(11);

desktop_version/src/Render.cpp

@@ -176,6 +176,18 @@ void menurender()
                 graphics.Print(-1, 95, "Current mode: Over 30 FPS", tr, tg, tb, true);
             }
             break;
+        case 6:
+            graphics.bigprint(-1, 30, "Toggle VSync", tr, tg, tb, true);
+            graphics.Print(-1, 65, "Turn VSync on or off.", tr, tg, tb, true);
+
+            if (!graphics.vsync)
+            {
+                graphics.Print(-1, 95, "Current mode: VSYNC OFF", tr/2, tg/2, tb/2, true);
+            }
+            else
+            {
+                graphics.Print(-1, 95, "Current mode: VSYNC ON", tr, tg, tb, true);
+            }
         }
         break;
     case Menu::credits:

desktop_version/src/main.cpp

@@ -105,8 +105,6 @@ int main(int argc, char *argv[])
         }
     }
 
-    SDL_SetHintWithPriority(SDL_HINT_RENDER_VSYNC, "1", SDL_HINT_OVERRIDE);
-
     if(!FILESYSTEM_init(argv[0], baseDir, assetsPath))
     {
         return 1;
@@ -208,6 +206,8 @@ int main(int argc, char *argv[])
 
     //Moved screensetting init here from main menu V2.1
     game.loadstats();
+    graphics.processVsync();
+
     if (game.skipfakeload)
         game.gamestate = TITLEMODE;
     if(game.usingmmmmmm==0) music.usingmmmmmm=false;