#ifndef OPENMW_MWRENDER_UTIL_H
#define OPENMW_MWRENDER_UTIL_H

#include <osg/NodeCallback>
#include <osg/Camera>
#include <osg/ref_ptr>
#include <string>

namespace osg
{
    class Node;
    class Texture2D;
}

namespace Resource
{
    class ResourceSystem;
}

namespace MWRender
{
    // Overrides the texture of nodes in the mesh that had the same NiTexturingProperty as the first NiTexturingProperty of the .NIF file's root node,
    // if it had a NiTexturingProperty. Used for applying "particle textures" to magic effects.
    void overrideFirstRootTexture(const std::string &texture, Resource::ResourceSystem *resourceSystem, osg::ref_ptr<osg::Node> node);

    void overrideTexture(const std::string& texture, Resource::ResourceSystem* resourceSystem, osg::ref_ptr<osg::Node> node);

    // Node callback to entirely skip the traversal.
    class NoTraverseCallback : public osg::NodeCallback
    {
    public:
        void operator()(osg::Node* node, osg::NodeVisitor* nv) override
        {
            // no traverse()
        }
    };

    /// Draw callback for RTT that can be used to regenerate mipmaps
    /// either as a predraw before use or a postdraw after RTT.
    class MipmapCallback : public osg::Camera::DrawCallback
    {
    public:
        MipmapCallback(osg::Texture2D* texture)
            : mTexture(texture)
        {}

        ~MipmapCallback();

        void operator()(osg::RenderInfo& info) const override;

    private:

        osg::ref_ptr<osg::Texture2D> mTexture;
    };
}

#endif