OgreImGuiOverlay.h

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// This file is part of the OGRE project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at https://www.ogre3d.org/licensing.
 
#pragma once
 
#include <OgreOverlay.h>
 
#include <imgui.h>
 
namespace Ogre
{
class ImGuiOverlay : public Overlay
{
public:
    ImGuiOverlay();
    ~ImGuiOverlay();
 
    ImFont* addFont(const String& name, const String& group OGRE_RESOURCE_GROUP_INIT, float size_scale = 1.f);
 
    void rebuildFontTexture();
 
    static void NewFrame(const FrameEvent& evt);
 
    void _findVisibleObjects(Camera* cam, RenderQueue* queue, Viewport* vp);
 
    void initialise(); // RIGSOFRODS: Private and non-virtual in OGRE... how does it even work?
 
private:
 
    typedef std::vector<ImWchar> CodePointRange;
    std::vector<CodePointRange> mCodePointRanges;
 
    class ImGUIRenderable : public Ogre::Renderable
    {
    public:
        ImGUIRenderable();
        ~ImGUIRenderable();
 
        void initialise();
 
        void updateVertexData(const ImVector<ImDrawVert>& vtxBuf, const ImVector<ImDrawIdx>& idxBuf);
 
        bool preRender(SceneManager* sm, RenderSystem* rsys);
 
        virtual void getWorldTransforms(Matrix4* xform) const { *xform = mXform; }
        virtual void getRenderOperation(RenderOperation& op) { op = mRenderOp; }
 
        const LightList& getLights(void) const;
 
        void createMaterial();
        void createFontTexture();
 
        const MaterialPtr& getMaterial() const { return mMaterial; }
 
        Real getSquaredViewDepth(const Camera*) const { return 0; }
 
        void _update();
 
        bool mConvertToBGR;
 
        Matrix4 mXform;
        RenderOperation mRenderOp;
        TexturePtr mFontTex;
        MaterialPtr mMaterial;
    };
 
    ImGUIRenderable mRenderable;
};
} // namespace Ogre