ogre2_imgui_manager.h

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#pragma once
 
#include "components/3rdparty/imgui/imgui.h"
#include <OGRE/OgrePrerequisites.h>
 
#include <OGRE/OgreRenderQueueListener.h>
#include <OGRE/OgreSingleton.h>
#include <OGRE/OgreTextureGpu.h>
#include <OGRE/OgreResourceGroupManager.h>
#include <OGRE/OgreRenderable.h>
#include <OGRE/OgreRenderOperation.h>
 
namespace OgreBites
{
    struct InputListener;
}
 
namespace Ogre
{
    class SceneManager;
 
    class ImguiManager : public RenderQueueListener, public Singleton<ImguiManager>
    {
    public:
        static void createSingleton();
 
        ImguiManager();
        ~ImguiManager();
 
        ImFont* addFont(const String& name, const String& group OGRE_RESOURCE_GROUP_INIT);
 
        virtual void init(Ogre::SceneManager* mgr);
 
        virtual void newFrame(float deltaTime, const Ogre::Rect& windowRect);
 
        //inherited from RenderQueueListener
        virtual void renderQueueEnded(uint8 queueGroupId, const String& invocation, bool& repeatThisInvocation);
 
        OgreBites::InputListener* getInputListener();
 
        static ImguiManager& getSingleton(void);
        static ImguiManager* getSingletonPtr(void);
 
    protected:
 
        class ImGUIRenderable : public Renderable
        {
        protected:
            void initImGUIRenderable(void);
 
        public:
            ImGUIRenderable();
            ~ImGUIRenderable();
 
            void updateVertexData(const ImVector<ImDrawVert>& vtxBuf, const ImVector<ImDrawIdx>& idxBuf);
            Real getSquaredViewDepth(const Camera* cam) const { (void)cam; return 0; }
 
            virtual const MaterialPtr& getMaterial(void) const { return mMaterial; }
            virtual void getWorldTransforms(Matrix4* xform) const { *xform = mXform; }
            virtual void getRenderOperation(RenderOperation& op) { op = mRenderOp; }
            virtual const LightList& getLights(void) const;
 
            MaterialPtr              mMaterial;
            Matrix4                  mXform;
            RenderOperation          mRenderOp;
 
        };
 
        void createFontTexture();
        void createMaterial();
 
        SceneManager* mSceneMgr;
 
        ImGUIRenderable             mRenderable;
        TexturePtr                  mFontTex;
 
        bool                        mFrameEnded;
 
        typedef std::vector<ImWchar> CodePointRange;
        std::vector<CodePointRange> mCodePointRanges;
    };
}