// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#include "COctreeSceneNode.h"
#include "Octree.h"
#include "ISceneManager.h"
#include "IVideoDriver.h"
#include "ICameraSceneNode.h"
#include "IMeshCache.h"
#include "IAnimatedMesh.h"
#include "IMaterialRenderer.h"
#include "os.h"
#include "CShadowVolumeSceneNode.h"

namespace irr
{
namespace scene
{


//! constructor
COctreeSceneNode::COctreeSceneNode(ISceneNode* parent, ISceneManager* mgr,
					 s32 id, s32 minimalPolysPerNode)
	: IMeshSceneNode(parent, mgr, id), StdOctree(0), LightMapOctree(0),
	TangentsOctree(0), VertexType((video::E_VERTEX_TYPE)-1),
	MinimalPolysPerNode(minimalPolysPerNode), Mesh(0), Shadow(0),
	UseVBOs(OCTREE_USE_HARDWARE), UseVisibilityAndVBOs(OCTREE_USE_VISIBILITY),
	BoxBased(OCTREE_BOX_BASED)
{
#ifdef _DEBUG
	setDebugName("COctreeSceneNode");
#endif
}


//! destructor
COctreeSceneNode::~COctreeSceneNode()
{
	if (Shadow)
		Shadow->drop();
	deleteTree();
}


void COctreeSceneNode::OnRegisterSceneNode()
{
	if (IsVisible)
	{
		// because this node supports rendering of mixed mode meshes consisting of
		// transparent and solid material at the same time, we need to go through all
		// materials, check of what type they are and register this node for the right
		// render pass according to that.

		video::IVideoDriver* driver = SceneManager->getVideoDriver();

		PassCount = 0;
		u32 transparentCount = 0;
		u32 solidCount = 0;

		// count transparent and solid materials in this scene node
		for (u32 i=0; i<Materials.size(); ++i)
		{
			const video::IMaterialRenderer* const rnd =
				driver->getMaterialRenderer(Materials[i].MaterialType);

			if (rnd && rnd->isTransparent())
				++transparentCount;
			else
				++solidCount;

			if (solidCount && transparentCount)
				break;
		}

		// register according to material types counted

		if (solidCount)
			SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);

		if (transparentCount)
			SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);

		ISceneNode::OnRegisterSceneNode();
	}
}


//! renders the node.
void COctreeSceneNode::render()
{
	video::IVideoDriver* driver = SceneManager->getVideoDriver();

	if (VertexType == -1 || !driver)
		return;

	ICameraSceneNode* camera = SceneManager->getActiveCamera();
	if (!camera)
		return;

	bool isTransparentPass =
		SceneManager->getSceneNodeRenderPass() == scene::ESNRP_TRANSPARENT;
	++PassCount;

	driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);

	if (Shadow)
		Shadow->updateShadowVolumes();

	SViewFrustum frust = *camera->getViewFrustum();

	//transform the frustum to the current absolute transformation
	if ( !AbsoluteTransformation.isIdentity() )
	{
		core::matrix4 invTrans(AbsoluteTransformation, core::matrix4::EM4CONST_INVERSE);
		frust.transform(invTrans);
	}

	const core::aabbox3d<float> &box = frust.getBoundingBox();

	switch (VertexType)
	{
	case video::EVT_STANDARD:
		{
			if (BoxBased)
				StdOctree->calculatePolys(box);
			else
				StdOctree->calculatePolys(frust);

			const Octree<video::S3DVertex>::SIndexData* d = StdOctree->getIndexData();

			for (u32 i=0; i<Materials.size(); ++i)
			{
				if ( 0 == d[i].CurrentSize )
					continue;

				const video::IMaterialRenderer* const rnd = driver->getMaterialRenderer(Materials[i].MaterialType);
				const bool transparent = (rnd && rnd->isTransparent());

				// only render transparent buffer if this is the transparent render pass
				// and solid only in solid pass
				if (transparent == isTransparentPass)
				{
					driver->setMaterial(Materials[i]);
					driver->drawIndexedTriangleList(
						&StdMeshes[i].Vertices[0], StdMeshes[i].Vertices.size(),
						d[i].Indices, d[i].CurrentSize / 3);
				}
			}

			// for debug purposes only
			if (DebugDataVisible && !Materials.empty() && PassCount==1)
			{
				const core::aabbox3df& box = frust.getBoundingBox();
				core::array< const core::aabbox3d<f32>* > boxes;
				video::SMaterial m;
				m.Lighting = false;
				driver->setMaterial(m);
				if ( DebugDataVisible & scene::EDS_BBOX_BUFFERS )
				{
					StdOctree->getBoundingBoxes(box, boxes);
					for (u32 b=0; b!=boxes.size(); ++b)
						driver->draw3DBox(*boxes[b]);
				}

				if ( DebugDataVisible & scene::EDS_BBOX )
					driver->draw3DBox(Box,video::SColor(0,255,0,0));
			}
		}
		break;
	case video::EVT_2TCOORDS:
		{
			if (BoxBased)
				LightMapOctree->calculatePolys(box);
			else
				LightMapOctree->calculatePolys(frust);

			const Octree<video::S3DVertex2TCoords>::SIndexData* d = LightMapOctree->getIndexData();

			for (u32 i=0; i<Materials.size(); ++i)
			{
				if ( 0 == d[i].CurrentSize )
					continue;

				const video::IMaterialRenderer* const rnd = driver->getMaterialRenderer(Materials[i].MaterialType);
				const bool transparent = (rnd && rnd->isTransparent());

				// only render transparent buffer if this is the transparent render pass
				// and solid only in solid pass
				if (transparent == isTransparentPass)
				{
					driver->setMaterial(Materials[i]);
					if (UseVBOs)
					{
						if (UseVisibilityAndVBOs)
						{
							u16* oldPointer = LightMapMeshes[i].Indices.pointer();
							const u32 oldSize = LightMapMeshes[i].Indices.size();
							LightMapMeshes[i].Indices.set_free_when_destroyed(false);
							LightMapMeshes[i].Indices.set_pointer(d[i].Indices, d[i].CurrentSize, false, false);
							LightMapMeshes[i].setDirty(scene::EBT_INDEX);
							driver->drawMeshBuffer ( &LightMapMeshes[i] );
							LightMapMeshes[i].Indices.set_pointer(oldPointer, oldSize);
							LightMapMeshes[i].setDirty(scene::EBT_INDEX);
						}
						else
							driver->drawMeshBuffer ( &LightMapMeshes[i] );
					}
					else
						driver->drawIndexedTriangleList(
							&LightMapMeshes[i].Vertices[0],
							LightMapMeshes[i].Vertices.size(),
							d[i].Indices, d[i].CurrentSize / 3);
				}
			}

			// for debug purposes only
			if (DebugDataVisible && !Materials.empty() && PassCount==1)
			{
				const core::aabbox3d<float> &box = frust.getBoundingBox();
				core::array< const core::aabbox3d<f32>* > boxes;
				video::SMaterial m;
				m.Lighting = false;
				driver->setMaterial(m);
				if ( DebugDataVisible & scene::EDS_BBOX_BUFFERS )
				{
					LightMapOctree->getBoundingBoxes(box, boxes);
					for (u32 b=0; b<boxes.size(); ++b)
						driver->draw3DBox(*boxes[b]);
				}

				if ( DebugDataVisible & scene::EDS_BBOX )
					driver->draw3DBox(Box,video::SColor(0,255,0,0));
			}
		}
		break;
	case video::EVT_TANGENTS:
		{
			if (BoxBased)
				TangentsOctree->calculatePolys(box);
			else
				TangentsOctree->calculatePolys(frust);

			const Octree<video::S3DVertexTangents>::SIndexData* d =  TangentsOctree->getIndexData();

			for (u32 i=0; i<Materials.size(); ++i)
			{
				if ( 0 == d[i].CurrentSize )
					continue;

				const video::IMaterialRenderer* const rnd = driver->getMaterialRenderer(Materials[i].MaterialType);
				const bool transparent = (rnd && rnd->isTransparent());

				// only render transparent buffer if this is the transparent render pass
				// and solid only in solid pass
				if (transparent == isTransparentPass)
				{
					driver->setMaterial(Materials[i]);
					driver->drawIndexedTriangleList(
						&TangentsMeshes[i].Vertices[0], TangentsMeshes[i].Vertices.size(),
						d[i].Indices, d[i].CurrentSize / 3);
				}
			}

			// for debug purposes only
			if (DebugDataVisible && !Materials.empty() && PassCount==1)
			{
				const core::aabbox3d<float> &box = frust.getBoundingBox();
				core::array< const core::aabbox3d<f32>* > boxes;
				video::SMaterial m;
				m.Lighting = false;
				driver->setMaterial(m);
				if ( DebugDataVisible & scene::EDS_BBOX_BUFFERS )
				{
					TangentsOctree->getBoundingBoxes(box, boxes);
					for (u32 b=0; b<boxes.size(); ++b)
						driver->draw3DBox(*boxes[b]);
				}

				if ( DebugDataVisible & scene::EDS_BBOX )
					driver->draw3DBox(Box,video::SColor(0,255,0,0));
			}
		}
		break;
	}
}


//! Removes a child from this scene node.
//! Implemented here, to be able to remove the shadow properly, if there is one,
//! or to remove attached childs.
bool COctreeSceneNode::removeChild(ISceneNode* child)
{
	if (child && Shadow == child)
	{
		Shadow->drop();
		Shadow = 0;
	}

	return ISceneNode::removeChild(child);
}


//! Creates shadow volume scene node as child of this node
//! and returns a pointer to it.
IShadowVolumeSceneNode* COctreeSceneNode::addShadowVolumeSceneNode(
		const IMesh* shadowMesh, s32 id, bool zfailmethod, f32 infinity)
{
	if (!SceneManager->getVideoDriver()->queryFeature(video::EVDF_STENCIL_BUFFER))
		return 0;

	if (!shadowMesh)
		shadowMesh = Mesh; // if null is given, use the mesh of node

	if (Shadow)
		Shadow->drop();

	Shadow = new CShadowVolumeSceneNode(shadowMesh, this, SceneManager, id,  zfailmethod, infinity);
	return Shadow;
}


//! returns the axis aligned bounding box of this node
const core::aabbox3d<f32>& COctreeSceneNode::getBoundingBox() const
{
	return Box;
}


//! creates the tree
/* This method has a lot of duplication and overhead. Moreover, the tangents mesh conversion does not really work. I think we need a a proper mesh implementation for octrees, which handle all vertex types internally. Converting all structures to just one vertex type is always problematic.
Thanks to Auria for fixing major parts of this method. */
bool COctreeSceneNode::createTree(IMesh* mesh)
{
	if (!mesh)
		return false;

	MeshName = SceneManager->getMeshCache()->getMeshName(mesh);

    mesh->grab();
	deleteTree();

	Mesh = mesh;

	const u32 beginTime = os::Timer::getRealTime();

	u32 nodeCount = 0;
	u32 polyCount = 0;
	u32 i;

	Box = mesh->getBoundingBox();

	if (mesh->getMeshBufferCount())
	{
		// check for "larger" buffer types
		VertexType = video::EVT_STANDARD;
		u32 meshReserve = 0;
		for (i=0; i<mesh->getMeshBufferCount(); ++i)
		{
			const IMeshBuffer* b = mesh->getMeshBuffer(i);
			if (b->getVertexCount() && b->getIndexCount())
			{
				++meshReserve;
				if (b->getVertexType() == video::EVT_2TCOORDS)
					VertexType = video::EVT_2TCOORDS;
				else if (b->getVertexType() == video::EVT_TANGENTS)
					VertexType = video::EVT_TANGENTS;
			}
		}
		Materials.reallocate(Materials.size()+meshReserve);

		switch(VertexType)
		{
		case video::EVT_STANDARD:
			{
				StdMeshes.reallocate(StdMeshes.size() + meshReserve);
				for (i=0; i<mesh->getMeshBufferCount(); ++i)
				{
					IMeshBuffer* b = mesh->getMeshBuffer(i);

					if (b->getVertexCount() && b->getIndexCount())
					{
						Materials.push_back(b->getMaterial());

						StdMeshes.push_back(Octree<video::S3DVertex>::SMeshChunk());
						Octree<video::S3DVertex>::SMeshChunk &nchunk = StdMeshes.getLast();
						nchunk.MaterialId = Materials.size() - 1;

						u32 v;
						nchunk.Vertices.reallocate(b->getVertexCount());
						switch (b->getVertexType())
						{
						case video::EVT_STANDARD:
							for (v=0; v<b->getVertexCount(); ++v)
								nchunk.Vertices.push_back(((video::S3DVertex*)b->getVertices())[v]);
							break;
						case video::EVT_2TCOORDS:
							for (v=0; v<b->getVertexCount(); ++v)
								nchunk.Vertices.push_back(((video::S3DVertex2TCoords*)b->getVertices())[v]);
							break;
						case video::EVT_TANGENTS:
							for (v=0; v<b->getVertexCount(); ++v)
								nchunk.Vertices.push_back(((video::S3DVertexTangents*)b->getVertices())[v]);
							break;
						}

						polyCount += b->getIndexCount();

						nchunk.Indices.reallocate(b->getIndexCount());
						for (v=0; v<b->getIndexCount(); ++v)
							nchunk.Indices.push_back(b->getIndices()[v]);
					}
				}

				StdOctree = new Octree<video::S3DVertex>(StdMeshes, MinimalPolysPerNode);
				nodeCount = StdOctree->getNodeCount();
			}
			break;
		case video::EVT_2TCOORDS:
			{
				LightMapMeshes.reallocate(LightMapMeshes.size() + meshReserve);

				for ( i=0; i < mesh->getMeshBufferCount(); ++i)
				{
					IMeshBuffer* b = mesh->getMeshBuffer(i);

					if (b->getVertexCount() && b->getIndexCount())
					{
						Materials.push_back(b->getMaterial());
						LightMapMeshes.push_back(Octree<video::S3DVertex2TCoords>::SMeshChunk());
						Octree<video::S3DVertex2TCoords>::SMeshChunk& nchunk = LightMapMeshes.getLast();
						nchunk.MaterialId = Materials.size() - 1;

						if (UseVisibilityAndVBOs)
						{
							nchunk.setHardwareMappingHint(scene::EHM_STATIC, scene::EBT_VERTEX);
							nchunk.setHardwareMappingHint(scene::EHM_DYNAMIC, scene::EBT_INDEX);
						}
						else
							nchunk.setHardwareMappingHint(scene::EHM_STATIC);

						u32 v;
						nchunk.Vertices.reallocate(b->getVertexCount());
						switch (b->getVertexType())
						{
						case video::EVT_STANDARD:
							for (v=0; v<b->getVertexCount(); ++v)
								nchunk.Vertices.push_back(((video::S3DVertex*)b->getVertices())[v]);
							break;
						case video::EVT_2TCOORDS:
							for (v=0; v<b->getVertexCount(); ++v)
								nchunk.Vertices.push_back(((video::S3DVertex2TCoords*)b->getVertices())[v]);
							break;
						case video::EVT_TANGENTS:
							for (v=0; v<b->getVertexCount(); ++v)
								nchunk.Vertices.push_back(((video::S3DVertexTangents*)b->getVertices())[v]);
							break;
						}

						polyCount += b->getIndexCount();
						nchunk.Indices.reallocate(b->getIndexCount());
						for (v=0; v<b->getIndexCount(); ++v)
							nchunk.Indices.push_back(b->getIndices()[v]);
					}
				}

				LightMapOctree = new Octree<video::S3DVertex2TCoords>(LightMapMeshes, MinimalPolysPerNode);
				nodeCount = LightMapOctree->getNodeCount();
			}
			break;
		case video::EVT_TANGENTS:
			{
				TangentsMeshes.reallocate(TangentsMeshes.size() + meshReserve);

				for (u32 i=0; i<mesh->getMeshBufferCount(); ++i)
				{
					IMeshBuffer* b = mesh->getMeshBuffer(i);

					if (b->getVertexCount() && b->getIndexCount())
					{
						Materials.push_back(b->getMaterial());
						TangentsMeshes.push_back(Octree<video::S3DVertexTangents>::SMeshChunk());
						Octree<video::S3DVertexTangents>::SMeshChunk& nchunk = TangentsMeshes.getLast();
						nchunk.MaterialId = Materials.size() - 1;

						u32 v;
						nchunk.Vertices.reallocate(b->getVertexCount());
						switch (b->getVertexType())
						{
						case video::EVT_STANDARD:
							for (v=0; v<b->getVertexCount(); ++v)
							{
								const video::S3DVertex& tmpV = ((video::S3DVertex*)b->getVertices())[v];
								nchunk.Vertices.push_back(video::S3DVertexTangents(tmpV.Pos, tmpV.Color, tmpV.TCoords));
							}
							break;
						case video::EVT_2TCOORDS:
							for (v=0; v<b->getVertexCount(); ++v)
							{
								const video::S3DVertex2TCoords& tmpV = ((video::S3DVertex2TCoords*)b->getVertices())[v];
								nchunk.Vertices.push_back(video::S3DVertexTangents(tmpV.Pos, tmpV.Color, tmpV.TCoords));
							}
							break;
						case video::EVT_TANGENTS:
							for (v=0; v<b->getVertexCount(); ++v)
								nchunk.Vertices.push_back(((video::S3DVertexTangents*)b->getVertices())[v]);
							break;
						}

						polyCount += b->getIndexCount();
						nchunk.Indices.reallocate(b->getIndexCount());
						for (v=0; v<b->getIndexCount(); ++v)
							nchunk.Indices.push_back(b->getIndices()[v]);
					}
				}

				TangentsOctree = new Octree<video::S3DVertexTangents>(TangentsMeshes, MinimalPolysPerNode);
				nodeCount = TangentsOctree->getNodeCount();
			}
			break;
		}
	}

	const u32 endTime = os::Timer::getRealTime();
	c8 tmp[255];
	sprintf(tmp, "Needed %ums to create Octree SceneNode.(%u nodes, %u polys)",
		endTime - beginTime, nodeCount, polyCount/3);
	os::Printer::log(tmp, ELL_INFORMATION);

	return true;
}


//! returns the material based on the zero based index i. To get the amount
//! of materials used by this scene node, use getMaterialCount().
//! This function is needed for inserting the node into the scene hirachy on a
//! optimal position for minimizing renderstate changes, but can also be used
//! to directly modify the material of a scene node.
video::SMaterial& COctreeSceneNode::getMaterial(u32 i)
{
	if ( i >= Materials.size() )
		return ISceneNode::getMaterial(i);

	return Materials[i];
}


//! returns amount of materials used by this scene node.
u32 COctreeSceneNode::getMaterialCount() const
{
	return Materials.size();
}


//! Writes attributes of the scene node.
void COctreeSceneNode::serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options) const
{
	ISceneNode::serializeAttributes(out, options);

	out->addInt("MinimalPolysPerNode", MinimalPolysPerNode);
	out->addString("Mesh", MeshName.c_str());
}


//! Reads attributes of the scene node.
void COctreeSceneNode::deserializeAttributes(io::IAttributes* in, io::SAttributeReadWriteOptions* options)
{
	const s32 oldMinimal = MinimalPolysPerNode;

	MinimalPolysPerNode = in->getAttributeAsInt("MinimalPolysPerNode");
	io::path newMeshStr = in->getAttributeAsString("Mesh");

	IMesh* newMesh = 0;

	if (newMeshStr == "")
		newMeshStr = MeshName;

	IAnimatedMesh* newAnimatedMesh = SceneManager->getMesh(newMeshStr.c_str());

	if (newAnimatedMesh)
		newMesh = newAnimatedMesh->getMesh(0);

	if (newMesh && ((MeshName != newMeshStr) || (MinimalPolysPerNode != oldMinimal)))
	{
		// recalculate tree
		createTree(newMesh);
	}

	ISceneNode::deserializeAttributes(in, options);
}


void COctreeSceneNode::deleteTree()
{
	delete StdOctree;
	StdOctree = 0;
	StdMeshes.clear();

	delete LightMapOctree;
	LightMapOctree = 0;
	LightMapMeshes.clear();

	delete TangentsOctree;
	TangentsOctree = 0;
	TangentsMeshes.clear();

	Materials.clear();

	if(Mesh)
		Mesh->drop();
}

void COctreeSceneNode::setMesh(IMesh* mesh)
{
	createTree(mesh);
}

IMesh* COctreeSceneNode::getMesh(void)
{
	return Mesh;
}

void COctreeSceneNode::setReadOnlyMaterials(bool readonly)
{
	// Do nothing
}

bool COctreeSceneNode::isReadOnlyMaterials() const
{
	return false;
}


} // end namespace scene
} // end namespace irr