New CUIProgressBar mode: from center to edges

For example, you can create loading screen like in SoC/CS with this
feature

src/xrGame/ui/UIProgressBar.cpp

@@ -39,16 +39,26 @@ void CUIProgressBar::UpdateProgressBar()
 
     float fCurrentLength = m_ProgressPos.x * progressbar_unit;
 
-    if (m_orient_mode == om_horz || m_orient_mode == om_back)
+    switch (m_orient_mode)
     {
+    case om_horz:
+    case om_back:
+    case om_fromcenter:
         m_CurrentLength = GetWidth() * fCurrentLength;
-    }
-    else if (m_orient_mode == om_vert || m_orient_mode == om_down)
-    {
+        break;
+
+    case om_vert:
+    case om_down:
+    case om_vfromcenter:
         m_CurrentLength = GetHeight() * fCurrentLength;
-    }
-    else
-    {
+        break;
+
+    case om_tocenter:
+    case om_vtocenter:
+        R_ASSERT2(false, "to_center mode is not implemented.");
+        break;
+
+    default:
         m_CurrentLength = 0.0f;
     }
 
@@ -116,10 +126,21 @@ void CUIProgressBar::Draw()
     case om_vert: progress_rect.set(0, GetHeight() - m_CurrentLength, GetWidth(), GetHeight()); break;
     case om_back: progress_rect.set(GetWidth() - m_CurrentLength * 1.01f, 0, GetWidth(), GetHeight()); break;
     case om_down: progress_rect.set(0, 0, GetWidth(), m_CurrentLength); break;
-    // XXX: Implement two-way progress bar
-    case om_twoway: R_ASSERT2(false, "two_way mode is not implemented."); break;
-    case om_vtwoway: R_ASSERT2(false, "vert_two_way mode is not implemented."); break;
-    case om_tocenter: R_ASSERT2(false, "from_edges_to_center mode is not implemented."); break;
+    case om_fromcenter: 
+    {
+        const float center = GetWidth() / 2.f;
+        progress_rect.set(center - m_CurrentLength, 0, center + m_CurrentLength, GetHeight());
+        break;
+    }
+    case om_vfromcenter:
+    {
+        const float center = GetHeight() / 2.f;
+        progress_rect.set(0, center - m_CurrentLength, GetWidth(), center + m_CurrentLength);
+        break;
+    }
+    // XXX: Implement to_center mode
+    case om_tocenter:
+    case om_vtocenter: R_ASSERT2(false, "to_center mode is not implemented."); break;
     default: NODEFAULT; break;
     }
 

src/xrGame/ui/UIProgressBar.h

@@ -16,9 +16,10 @@ class CUIProgressBar : public CUIWindow
         om_vert = 1,
         om_back = 2,
         om_down = 3,
-        om_twoway = 4,
-        om_vtwoway = 5,
+        om_fromcenter = 4,
+        om_vfromcenter = 5,
         om_tocenter = 6,
+        om_vtocenter = 7,
         om_count
     } m_orient_mode;
 

src/xrGame/ui/UIXmlInit.cpp

@@ -559,18 +559,22 @@ bool CUIXmlInit::InitProgressBar(CUIXml& xml_doc, LPCSTR path, int index, CUIPro
     {
         mode = CUIProgressBar::om_down;
     }
-    else if (xr_stricmp(mode_str, "two_way") == 0)
+    else if (xr_stricmp(mode_str, "from_center") == 0)
     {
-        mode = CUIProgressBar::om_twoway;
+        mode = CUIProgressBar::om_fromcenter;
     }
-    else if (xr_stricmp(mode_str, "vert_two_way") == 0)
+    else if (xr_stricmp(mode_str, "vert_from_center") == 0)
     {
-        mode = CUIProgressBar::om_vtwoway;
+        mode = CUIProgressBar::om_vfromcenter;
     }
     else if (xr_stricmp(mode_str, "to_center") == 0)
     {
         mode = CUIProgressBar::om_tocenter;
     }
+    else if (xr_stricmp(mode_str, "vert_to_center") == 0)
+    {
+        mode = CUIProgressBar::om_vtocenter;
+    }
 
     pWnd->InitProgressBar(pos, size, mode);