make construction lazy loaded as well

src/include/construct.h

@@ -135,7 +135,7 @@ public:
 	}
 	~CConstruction();
 	void Clean();
-	void Load();
+	void Load(bool force = false);
 
 public:
 	std::string Ident;   /// construction identifier

src/stratagus/construct.cpp

@@ -85,7 +85,7 @@ void CConstruction::Clean()
 	this->ShadowFile.Height = 0;
 }
 
-void CConstruction::Load()
+void CConstruction::Load(bool force)
 {
 	if (this->Ident.empty()) {
 		return;
@@ -94,6 +94,11 @@ void CConstruction::Load()
 
 	this->Width = this->File.Width;
 	this->Height = this->File.Height;
+#ifdef DYNAMIC_LOAD
+	if (!force) {
+		return;
+	}
+#endif
 	if (!file.empty()) {
 		ShowLoadProgress(_("Construction %s"), file.c_str());
 		this->Sprite = CPlayerColorGraphic::New(file, this->Width, this->Height);

src/unit/unit_draw.cpp

@@ -882,9 +882,14 @@ static void DrawConstruction(const int player, const CConstructionFrame *cframe,
 {
 	PixelPos pos = screenPos;
 	if (cframe->File == ConstructionFileConstruction) {
-		const CConstruction &construction = *type.Construction;
+		CConstruction &construction = *type.Construction;
 		pos.x -= construction.Width / 2;
 		pos.y -= construction.Height / 2;
+#ifdef DYNAMIC_LOAD
+		if (!construction.Sprite) {
+			construction.Load(true);
+		}
+#endif
 		if (frame < 0) {
 			construction.Sprite->DrawPlayerColorFrameClipX(player, -frame - 1, pos.x, pos.y);
 		} else {