From f330060c9e237b5d1c8c67b437270fd5879f8766 Mon Sep 17 00:00:00 2001
From: skyjake <skyjake@users.sf.net>
Date: Sat, 18 May 2013 17:22:21 +0300
Subject: [PATCH] Client|GuiRootWidget: 2D projection matrix utility, widget
 deinit

---
 .../client/include/ui/widgets/guirootwidget.h    |  6 ++++++
 doomsday/client/src/ui/widgets/guirootwidget.cpp | 16 +++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/doomsday/client/include/ui/widgets/guirootwidget.h b/doomsday/client/include/ui/widgets/guirootwidget.h
index 8d2a06101e..eb0cb42af7 100644
--- a/doomsday/client/include/ui/widgets/guirootwidget.h
+++ b/doomsday/client/include/ui/widgets/guirootwidget.h
@@ -22,6 +22,7 @@
 #include <de/RootWidget>
 #include <de/AtlasTexture>
 #include <de/GLShaderBank>
+#include <de/Matrix>
 
 class ClientWindow;
 
@@ -49,6 +50,11 @@ class GuiRootWidget : public de::RootWidget
     de::AtlasTexture &atlas();
     de::GLShaderBank &shaders();
 
+    /**
+     * Returns the default projection for 2D graphics.
+     */
+    de::Matrix4f projMatrix2D() const;
+
     // Events.
     void update();
 
diff --git a/doomsday/client/src/ui/widgets/guirootwidget.cpp b/doomsday/client/src/ui/widgets/guirootwidget.cpp
index 57284ae469..3ebbf4001b 100644
--- a/doomsday/client/src/ui/widgets/guirootwidget.cpp
+++ b/doomsday/client/src/ui/widgets/guirootwidget.cpp
@@ -35,6 +35,14 @@ DENG2_PIMPL(GuiRootWidget)
           window(win),
           atlas(0)
     {}
+
+    ~Instance()
+    {
+        // Tell all widgets to release their resource allocations. The base
+        // class destructor will destroy all widgets, but this class governs
+        // shared GL resources, so we'll ask the widgets to do this now.
+        self.notifyTree(&Widget::deinitialize);
+    }
 };
 
 GuiRootWidget::GuiRootWidget(ClientWindow *window)
@@ -58,7 +66,7 @@ AtlasTexture &GuiRootWidget::atlas()
     {
         d->atlas.reset(AtlasTexture::newWithRowAllocator(
                            Atlas::BackingStore | Atlas::AllowDefragment,
-                           GLTexture::maximumSize()));
+                           GLTexture::maximumSize().min(GLTexture::Size(4096, 4096))));
     }
     return *d->atlas;
 }
@@ -68,6 +76,12 @@ GLShaderBank &GuiRootWidget::shaders()
     return ClientApp::glShaderBank();
 }
 
+Matrix4f GuiRootWidget::projMatrix2D() const
+{
+    RootWidget::Size const size = viewSize();
+    return Matrix4f::ortho(0, size.x, 0, size.y);
+}
+
 void GuiRootWidget::update()
 {
     // Allow GL operations.