worldspawn/src/renderer.h

/*
   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 ConstMemberCaller<RenderHighlighted, void (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