renderer.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 GtkRadiant is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined(INCLUDED_RENDERER_H)
#define INCLUDED_RENDERER_H

#include "irender.h"
#include "renderable.h"
#include "iselection.h"
#include "cullable.h"
#include "scenelib.h"
#include "math/frustum.h"
#include <vector>

inline Cullable* Instance_getCullable (scene::Instance& instance)
{
    return InstanceTypeCast<Cullable>::cast(instance);
}

inline Renderable* Instance_getRenderable (scene::Instance& instance)
{
    return InstanceTypeCast<Renderable>::cast(instance);
}

inline VolumeIntersectionValue Cullable_testVisible (scene::Instance& instance, const VolumeTest& volume,
        VolumeIntersectionValue parentVisible)
{
    if (parentVisible == c_volumePartial) {
        Cullable* cullable = Instance_getCullable(instance);
        if (cullable != 0) {
            return cullable->intersectVolume(volume, instance.localToWorld());
        }
    }
    return parentVisible;
}

template<typename _Walker>
class CullingWalker
{
        const VolumeTest& m_volume;
        const _Walker& m_walker;
    public:
        CullingWalker (const VolumeTest& volume, const _Walker& walker) :
            m_volume(volume), m_walker(walker)
        {
        }
        bool pre (const scene::Path& path, scene::Instance& instance, VolumeIntersectionValue parentVisible) const
        {
            VolumeIntersectionValue visible = Cullable_testVisible(instance, m_volume, parentVisible);
            if (visible != c_volumeOutside) {
                return m_walker.pre(path, instance);
            }
            return true;
        }
        void post (const scene::Path& path, scene::Instance& instance, VolumeIntersectionValue parentVisible) const
        {
            return m_walker.post(path, instance);
        }
};

template<typename Walker_>
class ForEachVisible: public scene::Graph::Walker
{
        const VolumeTest& m_volume;
        const Walker_& m_walker;
        mutable std::vector<VolumeIntersectionValue> m_state;
    public:
        ForEachVisible (const VolumeTest& volume, const Walker_& walker) :
            m_volume(volume), m_walker(walker)
        {
            m_state.push_back(c_volumePartial);
        }
        bool pre (const scene::Path& path, scene::Instance& instance) const
        {
            VolumeIntersectionValue visible = (path.top().get().visible()) ? m_state.back() : c_volumeOutside;

            if (visible == c_volumePartial) {
                visible = m_volume.TestAABB(instance.worldAABB());
            }

            m_state.push_back(visible);

            if (visible == c_volumeOutside) {
                return false;
            } else {
                return m_walker.pre(path, instance, m_state.back());
            }
        }
        void post (const scene::Path& path, scene::Instance& instance) const
        {
            if (m_state.back() != c_volumeOutside) {
                m_walker.post(path, instance, m_state.back());
            }

            m_state.pop_back();
        }
};

template<typename Functor>
inline void Scene_forEachVisible (scene::Graph& graph, const VolumeTest& volume, const Functor& functor)
{
    graph.traverse(ForEachVisible<CullingWalker<Functor> > (volume, CullingWalker<Functor> (volume, functor)));
}

class RenderHighlighted
{
        Renderer& m_renderer;
        const VolumeTest& m_volume;
    public:
        RenderHighlighted (Renderer& renderer, const VolumeTest& volume) :
            m_renderer(renderer), m_volume(volume)
        {
        }
        void render (const Renderable& renderable) const
        {
            switch (m_renderer.getStyle()) {
            case Renderer::eFullMaterials:
                renderable.renderSolid(m_renderer, m_volume);
                break;
            case Renderer::eWireframeOnly:
                renderable.renderWireframe(m_renderer, m_volume);
                break;
            }
        }
        typedef ConstMemberCaller1<RenderHighlighted, const Renderable&, &RenderHighlighted::render> RenderCaller;

        bool pre (const scene::Path& path, scene::Instance& instance, VolumeIntersectionValue parentVisible) const
        {
            m_renderer.PushState();

            if (Cullable_testVisible(instance, m_volume, parentVisible) != c_volumeOutside) {
                Renderable* renderable = Instance_getRenderable(instance);
                if (renderable) {
                    renderable->viewChanged();
                }

                Selectable* selectable = Instance_getSelectable(instance);
                if (selectable != 0 && selectable->isSelected()) {
                    if (GlobalSelectionSystem().Mode() != SelectionSystem::eComponent) {
                        m_renderer.Highlight(Renderer::eFace);
                    } else if (renderable) {
                        renderable->renderComponents(m_renderer, m_volume);
                    }
                    m_renderer.Highlight(Renderer::ePrimitive);
                }

                if (renderable) {
                    render(*renderable);
                }
            }

            return true;
        }
        void post (const scene::Path& path, scene::Instance& instance, VolumeIntersectionValue parentVisible) const
        {
            m_renderer.PopState();
        }
};

inline void Scene_Render (Renderer& renderer, const VolumeTest& volume)
{
    GlobalSceneGraph().traverse(ForEachVisible<RenderHighlighted> (volume, RenderHighlighted(renderer, volume)));
    GlobalShaderCache().forEachRenderable(RenderHighlighted::RenderCaller(RenderHighlighted(renderer, volume)));
}

#endif