CGuiWidgetDrawParms: Make constexpr constructible

We can allow this structure to be constructed in a constexpr context.

This also allows us to remove the cpp file, given it's no longer
necessary.

Runtime/GuiSys/CGuiWidgetDrawParms.cpp

@@ -1,5 +0,0 @@
-#include "Runtime/GuiSys/CGuiWidgetDrawParms.hpp"
-
-namespace urde {
-const CGuiWidgetDrawParms CGuiWidgetDrawParms::Default = {};
-}

Runtime/GuiSys/CGuiWidgetDrawParms.hpp

@@ -8,10 +8,11 @@ struct CGuiWidgetDrawParms {
   float x0_alphaMod = 1.f;
   zeus::CVector3f x4_cameraOffset;
 
-  CGuiWidgetDrawParms() = default;
-  CGuiWidgetDrawParms(float alphaMod, const zeus::CVector3f& cameraOff)
+  constexpr CGuiWidgetDrawParms() = default;
+  constexpr CGuiWidgetDrawParms(float alphaMod, const zeus::CVector3f& cameraOff)
   : x0_alphaMod(alphaMod), x4_cameraOffset(cameraOff) {}
-  static const CGuiWidgetDrawParms Default;
+
+  static constexpr CGuiWidgetDrawParms Default() { return {}; }
 };
 
 } // namespace urde

Runtime/GuiSys/CHudDecoInterface.cpp

@@ -324,7 +324,7 @@ void CHudDecoInterfaceScan::Update(float dt, const CStateManager& stateMgr) {
 void CHudDecoInterfaceScan::Draw() {
   x18_scanDisplay.Draw();
   if (x10_loadedScanHudFlat) {
-    x10_loadedScanHudFlat->Draw(CGuiWidgetDrawParms::Default);
+    x10_loadedScanHudFlat->Draw(CGuiWidgetDrawParms::Default());
   }
 }
 

Runtime/GuiSys/CMakeLists.txt

@@ -17,7 +17,7 @@ set(GUISYS_SOURCES
     CGuiTextPane.hpp CGuiTextPane.cpp
     CGuiTextSupport.hpp CGuiTextSupport.cpp
     CGuiWidget.hpp CGuiWidget.cpp
-    CGuiWidgetDrawParms.hpp CGuiWidgetDrawParms.cpp
+    CGuiWidgetDrawParms.hpp
     CSplashScreen.hpp CSplashScreen.cpp
     CGuiCompoundWidget.hpp CGuiCompoundWidget.cpp
     CSaveableState.hpp CSaveableState.cpp