From 57b9eafa0fd2d4d073a3fee9176f24b4cd98de52 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Sat, 7 Nov 2015 17:45:22 +0100
Subject: [PATCH] osgMyGUI: implement AdditiveLayer

---
 apps/openmw/mwgui/windowmanagerimp.cpp     |  2 ++
 components/myguiplatform/additivelayer.cpp | 33 ++++++++++++++++++++++
 components/myguiplatform/additivelayer.hpp | 33 ++++++++++++++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 components/myguiplatform/additivelayer.cpp
 create mode 100644 components/myguiplatform/additivelayer.hpp

diff --git a/apps/openmw/mwgui/windowmanagerimp.cpp b/apps/openmw/mwgui/windowmanagerimp.cpp
index 6f2e7755d..fdf26d949 100644
--- a/apps/openmw/mwgui/windowmanagerimp.cpp
+++ b/apps/openmw/mwgui/windowmanagerimp.cpp
@@ -34,6 +34,7 @@
 
 #include <components/myguiplatform/myguiplatform.hpp>
 #include <components/myguiplatform/myguirendermanager.hpp>
+#include <components/myguiplatform/additivelayer.hpp>
 
 #include <components/vfs/manager.hpp>
 
@@ -216,6 +217,7 @@ namespace MWGui
         MyGUI::FactoryManager::getInstance().registerFactory<MWGui::Widgets::MWScrollBar>("Widget");
         MyGUI::FactoryManager::getInstance().registerFactory<VideoWidget>("Widget");
         MyGUI::FactoryManager::getInstance().registerFactory<BackgroundImage>("Widget");
+        MyGUI::FactoryManager::getInstance().registerFactory<osgMyGUI::AdditiveLayer>("Layer");
         BookPage::registerMyGUIComponents ();
         ItemView::registerComponents();
         ItemWidget::registerComponents();
diff --git a/components/myguiplatform/additivelayer.cpp b/components/myguiplatform/additivelayer.cpp
new file mode 100644
index 000000000..aa2ef08b3
--- /dev/null
+++ b/components/myguiplatform/additivelayer.cpp
@@ -0,0 +1,33 @@
+#include "additivelayer.hpp"
+
+#include <osg/BlendFunc>
+#include <osg/StateSet>
+
+#include "myguirendermanager.hpp"
+
+namespace osgMyGUI
+{
+
+    AdditiveLayer::AdditiveLayer()
+    {
+        mStateSet = new osg::StateSet;
+        mStateSet->setAttributeAndModes(new osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::ONE));
+    }
+
+    AdditiveLayer::~AdditiveLayer()
+    {
+        // defined in .cpp file since we can't delete incomplete types
+    }
+
+    void AdditiveLayer::renderToTarget(MyGUI::IRenderTarget *_target, bool _update)
+    {
+        RenderManager& renderManager = static_cast<RenderManager&>(MyGUI::RenderManager::getInstance());
+
+        renderManager.setInjectState(mStateSet.get());
+
+        MyGUI::OverlappedLayer::renderToTarget(_target, _update);
+
+        renderManager.setInjectState(NULL);
+    }
+
+}
diff --git a/components/myguiplatform/additivelayer.hpp b/components/myguiplatform/additivelayer.hpp
new file mode 100644
index 000000000..f3d47bc82
--- /dev/null
+++ b/components/myguiplatform/additivelayer.hpp
@@ -0,0 +1,33 @@
+#ifndef OPENMW_COMPONENTS_MYGUIPLATFORM_ADDITIVELAYER
+#define OPENMW_COMPONENTS_MYGUIPLATFORM_ADDITIVELAYER
+
+#include <MyGUI_OverlappedLayer.h>
+
+#include <osg/ref_ptr>
+
+namespace osg
+{
+    class StateSet;
+}
+
+namespace osgMyGUI
+{
+
+    /// @brief A Layer rendering with additive blend mode.
+    class AdditiveLayer : public MyGUI::OverlappedLayer
+    {
+    public:
+        MYGUI_RTTI_DERIVED( AdditiveLayer )
+
+        AdditiveLayer();
+        ~AdditiveLayer();
+
+        virtual void renderToTarget(MyGUI::IRenderTarget* _target, bool _update);
+
+    private:
+        osg::ref_ptr<osg::StateSet> mStateSet;
+    };
+
+}
+
+#endif