dynamicmesh.cpp

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/*
        Scalable Building Simulator - Dynamic Mesh
        The Skyscraper Project - Version 2.0
        Copyright (C)2004-2024 Ryan Thoryk
        https://www.skyscrapersim.net
        https://sourceforge.net/projects/skyscraper/
        Contact - ryan@skyscrapersim.net
 
        This program 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.
 
        This program 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 this program; if not, write to the Free Software
        Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
 
#include <OgreSceneManager.h>
#include <OgreSubMesh.h>
#include <OgreMeshManager.h>
#include <OgreMesh.h>
#include <OgreEntity.h>
#include <OgreCamera.h>
#include "globals.h"
#include "sbs.h"
#include "mesh.h"
#include "wall.h"
#include "polymesh.h"
#include "polygon.h"
#include "triangle.h"
#include "texture.h"
#include "scenenode.h"
#include "profiler.h"
#include "dynamicmesh.h"
 
//this file includes function implementations of the low-level SBS geometry and mesh code
 
namespace SBS {
 
DynamicMesh::DynamicMesh(Object* parent, SceneNode *node, const std::string &name, Real max_render_distance, bool dynamic_buffers) : ObjectBase(parent)
{
        //creates a new Dynamic Mesh object, which manages multiple sets of geometry data for efficiency.
        //A MeshObject is a client of this object, which submits it's geometry data to be handled automatically
 
        //if "dynamic_buffers" is true, a MeshObject's geometry can be part of a larger combined mesh, yet still be movable
        //and rotated independently like a regular mesh, by using dynamic (writable) render buffers, becoming a virtual mesh
 
        SetName(name);
        this->node = node;
        render_distance = max_render_distance;
        file_model = false;
        prepared = false;
        this->dynamic_buffers = dynamic_buffers;
        force_combine = false;
        auto_combine = sbs->GetConfigBool("Skyscraper.SBS.DynamicMesh.AutoCombine", true);
        sbs->RegisterDynamicMesh(this);
}
 
DynamicMesh::~DynamicMesh()
{
        for (size_t i = 0; i < meshes.size(); i++)
        {
                meshes[i]->parent_deleting = true;
                delete meshes[i];
        }
        meshes.clear();
 
        if (sbs->FastDelete == false)
                sbs->UnregisterDynamicMesh(this);
}
 
bool DynamicMesh::LoadFromFile(const std::string &filename, const std::string &path)
{
        if (meshes.empty() == false)
                return false;
 
        Mesh* mesh = new Mesh(this, "", node, render_distance, filename, "", path);
 
        //if load failed
        if (!mesh->MeshWrapper)
        {
                delete mesh;
                return false;
        }
 
        meshes.emplace_back(mesh);
        file_model = true;
        return true;
}
 
bool DynamicMesh::LoadFromMesh(const std::string &meshname)
{
        if (meshes.empty() == false)
                return false;
 
        Mesh* mesh = new Mesh(this, "", node, render_distance, "", meshname);
 
        //if load failed
        if (!mesh->MeshWrapper)
        {
                delete mesh;
                return false;
        }
 
        meshes.emplace_back(mesh);
        file_model = true;
        return true;
}
 
void DynamicMesh::Enabled(bool value, MeshObject *client)
{
        if (client == 0 || meshes.size() == 1)
        {
                //manage client enabled status
                if (client != 0)
                {
                        int index = GetClientIndex(client);
                        if (index >= 0)
                                client_enable[index] = value;
 
                        //don't disable mesh if another client has it enabled
                        if (value == false && (int)client_enable.size() > 1)
                        {
                                for (size_t i = 0; i < client_enable.size(); i++)
                                {
                                        if (i == index)
                                                continue;
 
                                        if (client_enable[i] == true)
                                                return;
                                }
                        }
                }
 
                //enable all meshes if no client specified
                for (size_t i = 0; i < meshes.size(); i++)
                        meshes[i]->Enabled(value);
        }
        else if (meshes.size() > 1)
        {
                //enable a per-client mesh if specified
 
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        meshes[index]->Enabled(value);
        }
}
 
bool DynamicMesh::ChangeTexture(const std::string &old_texture, const std::string &new_texture, MeshObject *client)
{
        if (client == 0 || meshes.size() == 1)
        {
                bool result = true;
                for (size_t i = 0; i < meshes.size(); i++)
                {
                        bool change = meshes[i]->ChangeTexture(old_texture, new_texture);
                        if (change == false)
                                result = false;
                }
                return result;
        }
        else if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        return meshes[index]->ChangeTexture(old_texture, new_texture);
        }
        return false;
}
 
void DynamicMesh::EnableDebugView(bool value, MeshObject *client)
{
        if (client == 0 || meshes.size() == 1)
        {
                for (size_t i = 0; i < meshes.size(); i++)
                        meshes[i]->EnableDebugView(value);
        }
        else if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        meshes[index]->EnableDebugView(value);
        }
}
 
bool DynamicMesh::IsVisible(MeshObject *client)
{
        if (meshes.empty() == true)
                return false;
 
        if (client == 0 || meshes.size() == 1)
                return meshes[0]->IsVisible();
        else if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        return meshes[index]->IsVisible();
        }
        return false;
}
 
bool DynamicMesh::IsVisible(Ogre::Camera *camera, MeshObject *client)
{
        if (meshes.empty() == true)
                return false;
 
        if (client == 0 || meshes.size() == 1)
                return IsVisible(camera, 0);
        else if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        return IsVisible(camera, index);
        }
        return false;
}
 
bool DynamicMesh::IsVisible(Ogre::Camera *camera, int mesh_index)
{
        if (meshes.empty() == true)
                return false;
 
        if (mesh_index < 0 || mesh_index >= (int)meshes.size())
                return false;
 
        return meshes[mesh_index]->IsVisible(camera);
}
 
void DynamicMesh::Prepare(MeshObject *client)
{
        SBS_PROFILE("DynamicMesh::Prepare");
 
        if (file_model == true || prepared == true)
                return;
 
        if (clients.empty() == true)
                return;
 
        //determine if meshes should be combined or separated
        if (meshes.empty() == true)
        {
                int meshes_to_create = 0;
 
                if (clients.size() > 1)
                {
                        int total = GetMaterialCount();
                        int separate_total = 0;
 
                        int limit = 3; //compare against 3 client meshes totaled together
 
                        for (size_t i = 0; i < clients.size(); i++)
                        {
                                if (i == limit)
                                        break;
 
                                //separate_total += clients[i]->GetPolyMesh()->GetSubmeshCount();
                                separate_total += 1;
                        }
 
                        bool combined = false;
 
                        //if combined submesh/material count is less than three separate meshes
                        if (((total < separate_total || total <= 10) && auto_combine == true) || force_combine == true)
                        {
                                meshes_to_create = 1; //create a single combined mesh for all clients
                                combined = true;
                        }
                        else
                        {
                                meshes_to_create = (int)clients.size(); //create separate meshes for each client
                                dynamic_buffers = false; //don't use dynamic buffers if keeping separate
                        }
 
                        std::string status;
                        if (combined == true)
                        {
                                if (force_combine == false)
                                        status = "using combined";
                                else
                                        status = "using force combined";
                        }
                        else
                                status = "using separate";
 
                        //print optimization report
                        //if (sbs->Verbose)
                                Report(this->GetName() + ": Combined: " + ToString(total) + "  - Separate (3): " + ToString(separate_total) + " - " + status);
                }
                else
                        meshes_to_create = 1;
 
                //create mesh objects
                for (int i = 0; i < meshes_to_create; i++)
                {
                        Mesh *mesh = 0;
 
                        if (meshes_to_create == 1)
                                mesh = new Mesh(this, GetName(), node, render_distance);
                        else
                                mesh = new Mesh(this, clients[i]->GetName(), clients[i]->GetSceneNode(), render_distance);
 
                        meshes.emplace_back(mesh);
                }
        }
 
        if (client == 0 || meshes.size() == 1)
        {
                for (size_t i = 0; i < meshes.size(); i++)
                {
                        meshes[i]->prepared = false;
                        if (meshes.size() > 1)
                                meshes[i]->Prepare(true, (int)i);
                        else
                                meshes[i]->Prepare();
                }
        }
        else if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        meshes[index]->Prepare(true, index);
        }
 
        prepared = true;
}
 
void DynamicMesh::AddClient(MeshObject *mesh)
{
        //add a client mesh object to this dynamic mesh
 
        clients.emplace_back(mesh);
        client_enable.emplace_back(true);
}
 
void DynamicMesh::RemoveClient(MeshObject *mesh)
{
        //remove a client mesh from this dynamic mesh
 
        for (size_t i = 0; i < clients.size(); i++)
        {
                if (clients[i] == mesh)
                {
                        clients.erase(clients.begin() + i);
                        client_enable.erase(client_enable.begin() + i);
                        return;
                }
        }
}
 
MeshObject* DynamicMesh::GetClient(int number)
{
        if (number < 0 || number >= (int)clients.size())
                return 0;
 
        return clients[number];
}
 
int DynamicMesh::GetClientIndex(MeshObject *client)
{
        if (!client)
                return -1;
 
        for (size_t i = 0; i < clients.size(); i++)
        {
                if (clients[i] == client)
                        return (int)i;
        }
        return -1;
}
 
void DynamicMesh::NeedsUpdate(MeshObject *client)
{
        if (prepared == false)
                return;
 
        if (client == 0 || meshes.size() == 1)
                prepared = false;
        else if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0 && index < (int)meshes.size())
                {
                        meshes[index]->prepared = false;
                        prepared = false;
                }
        }
 
        Prepare(client);
}
 
int DynamicMesh::GetMaterials(std::vector<std::string> &materials, int client)
{
        //calculate the total number of materials used by all clients
 
        int start = 0;
        int end = (int)clients.size() - 1;
 
        if (client >= 0)
        {
                start = client;
                end = client;
        }
 
        //for each client
        for (int i = start; i <= end; i++)
        {
                for (size_t j = 0; j < clients[i]->Walls.size(); j++)
                {
                        if (!clients[i]->Walls[j])
                                continue;
 
                        for (size_t k = 0; k < clients[i]->Walls[j]->GetPolygonCount(); k++)
                        {
                                if (!clients[i]->Walls[j]->GetPolygon(k))
                                        continue;
 
                                std::string material = clients[i]->Walls[j]->GetPolygon(k)->material;
 
                                //find material in current list
                                bool found = false;
                                for (size_t k = 0; k < materials.size(); k++)
                                {
                                        if (materials[k] == material)
                                        {
                                                found = true;
                                                break;
                                        }
                                }
 
                                if (found == false)
                                        materials.emplace_back(material);
                        }
                }
        }
 
        return (int)materials.size();
}
 
int DynamicMesh::GetMaterialCount(int client)
{
        //calculate the number of materials needed for all clients or a specific client
 
        std::vector<std::string> materials;
        int total = GetMaterials(materials, client);
        return total;
}
 
unsigned int DynamicMesh::GetVertexCount(const std::string &material, int client)
{
        //calculate combined vertex count for all clients
 
        int start = 0;
        int end = (int)clients.size() - 1;
 
        if (client >= 0)
        {
                start = client;
                end = client;
        }
 
        unsigned int total = 0;
 
        for (int i = start; i <= end; i++)
        {
                if (material != "")
                {
                        for (size_t j = 0; j < clients[i]->Walls.size(); j++)
                        {
                                if (!clients[i]->Walls[j])
                                        continue;
 
                                for (int k = 0; k < clients[i]->Walls[j]->GetPolygonCount(); k++)
                                {
                                        Polygon *poly = clients[i]->Walls[j]->GetPolygon(k);
 
                                        if (!poly)
                                                continue;
 
                                        if (poly->material == material)
                                        {
                                                for (size_t l = 0; l < poly->geometry.size(); l++)
                                                {
                                                                total += poly->geometry[l].size();
                                                }
                                        }
                                }
                        }
                }
                else
                        total += clients[i]->GetVertexCount();
        }
 
        return total;
}
 
unsigned int DynamicMesh::GetTriangleCount(const std::string &material, int &client_count, int client)
{
        //calculate combined triangle count for all clients
 
        int start = 0;
        int end = (int)clients.size() - 1;
 
        if (client >= 0)
        {
                start = client;
                end = client;
        }
 
        unsigned int total = 0;
        client_count = 0;
 
        for (int i = start; i <= end; i++)
        {
                total += clients[i]->GetTriangleCount(material, false);
                client_count += 1;
        }
 
        return total;
}
 
unsigned int DynamicMesh::GetIndexOffset(MeshObject *client)
{
        //get vertex index offset of specific client mesh
        //if multiple geometry sets are combined together, each set has a starting index number
 
        unsigned int index = 0;
 
        //return value if using separate meshes
        if (meshes.size() > 1)
                return index;
 
        for (size_t i = 0; i < clients.size(); i++)
        {
                //if found, return current index value
                if (clients[i] == client)
                        return index;
 
                //if not found, increment by client's vertex count
                index += clients[i]->GetVertexCount();
        }
 
        return index;
}
 
void DynamicMesh::UpdateVertices(MeshObject *client, const std::string &material, Polygon *polygon, bool single)
{
        int client_index = GetClientIndex(client);
 
        if (client_index == -1 || meshes.empty())
                return;
 
        if (meshes.size() == 1)
                meshes[0]->UpdateVertices(client_index, material, polygon, single);
        else
                meshes[client_index]->UpdateVertices(client_index, material, polygon, single);
}
 
void DynamicMesh::DetachClient(MeshObject *client)
{
        if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        meshes[index]->Detach();
        }
}
 
int DynamicMesh::GetSubMeshCount(int mesh_index)
{
        if (meshes.empty() == true)
                return -1;
 
        if (mesh_index < 0 || mesh_index >= (int)meshes.size())
                return -1;
 
        return meshes[mesh_index]->GetSubMeshCount();
}
 
std::string DynamicMesh::GetMeshName(int mesh_index)
{
        if (meshes.empty() == true)
                return "";
 
        if (mesh_index < 0 || mesh_index >= (int)meshes.size())
                return "";
 
        return meshes[mesh_index]->name;
}
 
Ogre::AxisAlignedBox DynamicMesh::GetBounds(MeshObject *client)
{
        if (meshes.empty() == true)
                return Ogre::AxisAlignedBox::BOX_NULL;
 
        if (client == 0 || meshes.size() == 1)
                return meshes[0]->MeshWrapper->getBounds();
        else if (meshes.size() > 1)
        {
                int index = GetClientIndex(client);
 
                if (index >= 0)
                        return meshes[index]->MeshWrapper->getBounds();
        }
        return Ogre::AxisAlignedBox::BOX_NULL;
}
 
void DynamicMesh::EnableShadows(bool value)
{
        //enable shadows
 
        for (size_t i = 0; i < meshes.size(); i++)
                meshes[i]->EnableShadows(value);
}
 
void DynamicMesh::SetMaterial(const std::string& material)
{
        //set material on all meshes
 
        for (size_t i = 0; i < meshes.size(); i++)
                meshes[i]->SetMaterial(material);
}
 
DynamicMesh::Mesh::Mesh(DynamicMesh *parent, const std::string &name, SceneNode *node, Real max_render_distance, const std::string &filename, const std::string &meshname, const std::string &path)
{
        Parent = parent;
        sbs = Parent->GetRoot();
        this->node = node;
        enabled = false;
        prepared = false;
        Movable = 0;
        auto_shadows = true;
        parent_deleting = false;
 
        if (!node)
        {
                sbs->ReportError("DynamicMesh: Error creating mesh " + meshname + "\n");
                return;
        }
 
        if (filename == "")
        {
                this->name = name;
 
                //create mesh
                if (meshname == "")
                        MeshWrapper = Ogre::MeshManager::getSingleton().createManual(node->GetNameBase() + name, Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
                else
                {
                        //get true parent SBS object
                        Object *object = parent->GetParent()->GetParent()->GetParent();
 
                        //get loaded mesh
                        MeshWrapper = Ogre::MeshManager::getSingleton().getByName(object->GetNameBase() + meshname);
 
                        if (!MeshWrapper)
                        {
                                sbs->ReportError("DynamicMesh: Error loading mesh " + meshname + "\n");
                                return;
                        }
 
                }
        }
        else
        {
                this->name = filename;
 
                //load model
                try
                {
                        MeshWrapper = Ogre::MeshManager::getSingleton().load(filename, path);
                }
                catch (Ogre::Exception &e)
                {
                        sbs->ReportError("DynamicMesh: Error loading model " + filename + "\n" + e.getDescription());
                        MeshWrapper = 0;
                        return;
                }
        }
 
        //create and enable movable
        Movable = sbs->mSceneManager->createEntity(node->GetNameBase() + name, MeshWrapper);
        Enabled(true);
 
        //set maximum render distance
        Movable->setRenderingDistance(sbs->ToRemote(max_render_distance));
}
 
DynamicMesh::Mesh::~Mesh()
{
        Detach();
 
        for (size_t i = 0; i < client_entries.size(); i++)
        {
                delete client_entries[i].bounds;
        }
        client_entries.clear();
 
        try
        {
                if (MeshWrapper)
                {
                        if (Ogre::MeshManager::getSingleton().getByHandle(MeshWrapper->getHandle()))
                                Ogre::MeshManager::getSingleton().remove(MeshWrapper->getHandle());
                }
        }
        catch (Ogre::Exception &e)
        {
                sbs->ReportError("DynamicMesh: Error unloading mesh: " + e.getDescription());
        }
        MeshWrapper = 0;
}
 
void DynamicMesh::Mesh::Enabled(bool value)
{
        //attach or detach from scenegraph
 
        if (enabled == value || !node)
                return;
 
        if (value == false)
                node->DetachObject(Movable);
        else
                node->AttachObject(Movable);
 
        if (auto_shadows == true)
                Movable->setCastShadows(value);
 
        enabled = value;
}
 
bool DynamicMesh::Mesh::ChangeTexture(const std::string &old_texture, const std::string &new_texture)
{
        //change a texture on this mesh
 
        //if multiple clients are referencing the matching submesh,
        //re-prepare mesh to move client's triangles into the proper new submesh,
        //to prevent changing (and interfering with) other clients' textures
 
        SBS_PROFILE("DynamicMesh::Mesh::ChangeTexture");
 
        //get new material
        Ogre::MaterialPtr newmat = sbs->GetTextureManager()->GetMaterialByName(new_texture, "General");
 
        if (!newmat.get())
                return sbs->ReportError("ChangeTexture: Invalid texture '" + new_texture + "'");
 
        int submesh = FindMatchingSubMesh(old_texture);
 
        if (submesh == -1)
                return false;
 
        /*bool reprepare = false;
 
        if (Submeshes[submesh].clients > 1)
                reprepare = true; //re-prepare if breaking out of shared mesh
        else
        {
                int existing = FindMatchingSubMesh(new_texture);
 
                if (existing > -1)
                        reprepare = true; //re-prepare if integrating into an existing shared mesh
        }
 
        if (reprepare == true)
        {
                //re-prepare mesh
                prepared = false;
                Prepare(false);
                return true;
        }*/
 
        //set material if valid
        Submeshes[submesh].object->setMaterialName(ToString(sbs->InstanceNumber) + ":" + new_texture);
 
        //apply changes (refresh mesh state)
        MeshWrapper->_dirtyState();
 
        return true;
}
 
int DynamicMesh::Mesh::FindMatchingSubMesh(const std::string &material)
{
        //find a submesh with a matching material
        //returns array index
 
        std::string full_name = ToString(sbs->InstanceNumber) + ":" + material;
 
        for (size_t i = 0; i < Submeshes.size(); i++)
        {
                if (Submeshes[i].object->getMaterialName() == full_name)
                        return (int)i;
        }
        return -1;
}
 
DynamicMesh::Mesh::Submesh* DynamicMesh::Mesh::CreateSubMesh(const std::string &material)
{
        if (!node)
                return 0;
 
        int index = (int)Submeshes.size();
 
        //create and add submesh
        Submesh submesh;
        submesh.object = MeshWrapper->createSubMesh(node->GetFullName() + ":" + ToString(GetSubMeshCount()));
        submesh.object->useSharedVertices = true;
        submesh.clients = 0;
 
        //bind material
        submesh.object->setMaterialName(ToString(sbs->InstanceNumber) + ":" + material);
        submesh.material = material;
 
        Submeshes.emplace_back(submesh);
        return &Submeshes[index];
}
 
void DynamicMesh::Mesh::DeleteSubMesh(int client, int index)
{
        //delete a submesh
        //if no index is provided, delete any empty submeshes
 
        if (index == -1)
        {
                for (size_t i = 0; i < Submeshes.size(); i++)
                {
                        bool used = false;
 
                        if (client == -1)
                        {
                                for (int j = 0; j < Parent->GetClientCount(); j++)
                                {
                                        for (size_t k = 0; k < Parent->GetClient(j)->Walls.size(); k++)
                                        {
                                                if (!Parent->GetClient(j)->Walls[k])
                                                        continue;
 
                                                for (int l = 0; l < Parent->GetClient(j)->Walls[k]->GetPolygonCount(); l++)
                                                {
                                                        Polygon *poly = Parent->GetClient(j)->Walls[k]->GetPolygon(l);
                                                        if (!poly)
                                                                continue;
 
                                                        if (poly->material == Submeshes[i].material)
                                                        {
                                                                used = true;
                                                                break;
                                                        }
                                                }
                                        }
                                }
                        }
                        else
                        {
                                if (!Parent->GetClient(client))
                                        return;
 
                                for (size_t k = 0; k < Parent->GetClient(client)->Walls.size(); k++)
                                {
                                        if (!Parent->GetClient(client)->Walls[k])
                                                continue;
 
                                        for (int l = 0; l < Parent->GetClient(client)->Walls[k]->GetPolygonCount(); l++)
                                        {
                                                Polygon *poly = Parent->GetClient(client)->Walls[k]->GetPolygon(l);
                                                if (!poly)
                                                        continue;
 
                                                if (poly->material == Submeshes[i].material)
                                                {
                                                        used = true;
                                                        break;
                                                }
                                        }
                                }
                        }
 
                        if (used == false)
                        {
                                MeshWrapper->destroySubMesh((unsigned short)i);
                                Submeshes.erase(Submeshes.begin() + i);
                                i--;
                        }
                }
        }
        else if (index >= 0 && index < (int)Submeshes.size())
        {
                MeshWrapper->destroySubMesh(index);
                Submeshes.erase(Submeshes.begin() + index);
        }
}
 
void DynamicMesh::Mesh::Prepare(bool process_vertices, int client)
{
        //prepare mesh object
 
        //this function collects stored geometry and triangle data from all associated client meshes,
        //uses those to build GPU vertex and index render buffers, and prepares the dynamic mesh for rendering
        //geometry arrays must be populated correctly before this function is called
 
        //all submeshes share mesh vertex data, but triangle indices are stored in each submesh
        //each submesh represents a portion of the mesh that uses the same material
 
        SBS_PROFILE("DynamicMesh::Mesh::Prepare");
 
        if (prepared == true || !node)
                return;
 
        unsigned int vertex_count = Parent->GetVertexCount("", client);
 
        std::vector<std::string> materials;
        int submesh_count = Parent->GetMaterials(materials, client);
 
        //clear vertex data and exit if there's no associated submesh or geometry data
        if (submesh_count == 0 || vertex_count == 0)
        {
                if (MeshWrapper->sharedVertexData)
                        delete MeshWrapper->sharedVertexData;
                MeshWrapper->sharedVertexData = new Ogre::VertexData();
 
                //delete any existing submeshes
                for (size_t i = 0; i < Submeshes.size(); i++)
                {
                        DeleteSubMesh(-1, (int)i);
                }
 
                return;
        }
 
        //if removing existing submeshes, use existing submesh count
        if (submesh_count < (int)Submeshes.size())
                submesh_count = (int)Submeshes.size();
 
        int start = 0;
        int end = Parent->GetClientCount() - 1;
 
        if (client > -1)
        {
                start = client;
                end = client;
        }
 
        size_t previous_count = 0;
 
        if (process_vertices == true)
        {
                //set up vertex buffer
                if (MeshWrapper->sharedVertexData)
                {
                        previous_count = MeshWrapper->sharedVertexData->vertexCount;
                        delete MeshWrapper->sharedVertexData;
                }
                Ogre::VertexData* data = new Ogre::VertexData();
                MeshWrapper->sharedVertexData = data;
                data->vertexCount = vertex_count;
                Ogre::VertexDeclaration* decl = data->vertexDeclaration;
 
                //set up vertex data elements
                size_t offset = 0;
                decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION); //vertices
                offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
                decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_NORMAL); //normals
                offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
                decl->addElement(0, offset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES); //texels
 
                //set up vertex data arrays
                float *mVertexElements = new float[vertex_count * 8];
 
                //populate array with vertex geometry from each client mesh
                unsigned int loc = 0;
                unsigned int vindex = 0;
 
                //clear vertex offset, counts, and bounds tables
                for (size_t i = 0; i < client_entries.size(); i++)
                {
                        delete client_entries[i].bounds;
                }
                client_entries.clear();
 
                for (int num = start; num <= end; num++)
                {
                        MeshObject *mesh = Parent->GetClient(num);
                        Ogre::AxisAlignedBox client_box;
                        Real radius = 0;
 
                        ClientEntry entry;
 
                        //add current client's vertex index to offset table
                        entry.vertex_offset = vindex;
 
                        //get mesh's offset of associated scene node
                        Vector3 offset = sbs->ToRemote(mesh->GetPosition() - node->GetPosition());
 
                        //fill array with mesh's geometry data, from each wall
                        for (size_t index = 0; index < mesh->Walls.size(); index++)
                        {
                                if (!mesh->Walls[index])
                                        continue;
 
                                for (size_t i = 0; i < mesh->Walls[index]->GetPolygonCount(); i++)
                                {
                                        Polygon *poly = mesh->Walls[index]->GetPolygon(i);
 
                                        if (!poly)
                                                continue;
 
                                        for (size_t j = 0; j < poly->geometry.size(); j++)
                                        {
                                                for (size_t k = 0; k < poly->geometry[j].size(); k++)
                                                {
                                                        Polygon::Geometry &element = poly->geometry[j][k];
 
                                                        //make mesh's vertex relative to this scene node
                                                        Vector3 vertex;
                                                        if (client == -1)
                                                        {
                                                                Vector3 raw_vertex = mesh->GetOrientation() * element.vertex; //add mesh's rotation
                                                                vertex = (node->GetOrientation().Inverse() * raw_vertex) + offset; //remove node's rotation and add mesh offset
                                                        }
                                                        else
                                                                vertex = element.vertex;
 
                                                        //add elements to array
                                                        mVertexElements[loc] = (float)vertex.x;
                                                        mVertexElements[loc + 1] = (float)vertex.y;
                                                        mVertexElements[loc + 2] = (float)vertex.z;
                                                        mVertexElements[loc + 3] = (float)element.normal.x;
                                                        mVertexElements[loc + 4] = (float)element.normal.y;
                                                        mVertexElements[loc + 5] = (float)element.normal.z;
                                                        mVertexElements[loc + 6] = (float)element.texel.x;
                                                        mVertexElements[loc + 7] = (float)element.texel.y;
                                                        client_box.merge(vertex);
                                                        radius = std::max(radius, vertex.length());
                                                        loc += 8;
                                                }
                                        }
                                }
                        }
 
                        //store client bounding box and radius
                        entry.bounds = new Ogre::AxisAlignedBox(client_box);
                        entry.radius = radius;
 
                        //add client vertex count to list
                        entry.vertex_count = mesh->GetVertexCount();
                        vindex += entry.vertex_count;
 
                        //store client information
                        client_entries.emplace_back(entry);
                }
 
                //create vertex hardware buffer
                Ogre::HardwareVertexBufferSharedPtr vbuffer;
                if (Parent->UseDynamicBuffers() == false)
                        vbuffer = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(decl->getVertexSize(0), vertex_count, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
                else
                        vbuffer = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(decl->getVertexSize(0), vertex_count, Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY);
 
                vbuffer->writeData(0, vbuffer->getSizeInBytes(), mVertexElements, true);
                delete [] mVertexElements;
 
                //bind vertex data to mesh
                data->vertexBufferBinding->setBinding(0, vbuffer);
        }
 
        //process index arrays for each submesh
        for (int index = 0; index < submesh_count; index++)
        {
                std::string material;
                if (index < (int)materials.size())
                        material = materials[index];
                else
                        material = "";
 
                Submesh *submesh;
                int client_count;
                unsigned int triangle_count = 0;
 
                if (material != "")
                        triangle_count = Parent->GetTriangleCount(material, client_count, client);
 
                //get submesh index
                int match = FindMatchingSubMesh(material);
 
                //skip if no triangles found
                if (triangle_count == 0)
                {
                        //delete submesh if needed
                        DeleteSubMesh(client, -1);
                        continue;
                }
 
                //if a match is not found, create a new submesh
                if (match == -1)
                        submesh = CreateSubMesh(material);
                else
                        submesh = &Submeshes[match];
 
                if (!submesh)
                        continue;
 
                //skip this submesh, if old and new client counts are the same, and vertices weren't processed
                if (client_count == submesh->clients && process_vertices == false)
                        continue;
 
                //reset submesh's client reference count
                submesh->clients = 0;
 
                //set up index data array
                unsigned int isize = triangle_count * 3;
                Ogre::HardwareIndexBufferSharedPtr ibuffer;
 
                //if the number of vertices is greater than what can fit in a 16-bit index, use 32-bit indexes instead
                if (vertex_count > 65536)
                {
                        //set up a 32-bit index buffer
                        unsigned int *mIndices = new unsigned int[isize];
 
                        //create array of triangle indices
                        unsigned int loc = 0;
 
                        //for each client, get triangles for a matching client submesh
                        for (int num = start; num <= end; num++)
                        {
                                MeshObject *mesh = Parent->GetClient(num);
 
                                int poly_index = 0;
 
                                for (size_t i = 0; i < mesh->Walls.size(); i++)
                                {
                                        if (!mesh->Walls[i])
                                                continue;
 
                                        for (size_t j = 0; j < mesh->Walls[i]->GetPolygonCount(); j++)
                                        {
                                                Polygon *poly = mesh->Walls[i]->GetPolygon(j);
 
                                                if (!poly)
                                                        continue;
 
                                                if (poly->material == material)
                                                {
                                                        //get index offset of mesh
                                                        unsigned int offset = Parent->GetIndexOffset(mesh);
 
                                                        //add mesh's triangles to array and adjust for offset
                                                        for (size_t k = 0; k < poly->triangles.size(); k++)
                                                        {
                                                                Triangle &tri = poly->triangles[k];
                                                                mIndices[loc] = poly_index + tri.a + offset;
                                                                mIndices[loc + 1] = poly_index + tri.b + offset;
                                                                mIndices[loc + 2] = poly_index + tri.c + offset;
                                                                loc += 3;
                                                        }
 
                                                        //increment submesh's client reference count
                                                        submesh->clients += 1;
                                                }
 
                                                poly_index += poly->vertex_count;
                                        }
                                }
                        }
 
                        //create index hardware buffer
                        ibuffer = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(Ogre::HardwareIndexBuffer::IT_32BIT, isize, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
 
                        //write data to index buffer
                        ibuffer->writeData(0, ibuffer->getSizeInBytes(), mIndices, true);
                        delete [] mIndices;
                }
                else
                {
                        //set up a 16-bit index buffer
                        unsigned short *mIndices = new unsigned short[isize];
 
                        //create array of triangle indices
                        unsigned int loc = 0;
 
                        //for each client, get triangles for a matching client submesh
                        for (int num = start; num <= end; num++)
                        {
                                MeshObject *mesh = Parent->GetClient(num);
 
                                int poly_index = 0;
 
                                for (size_t i = 0; i < mesh->Walls.size(); i++)
                                {
                                        if (!mesh->Walls[i])
                                                continue;
 
                                        for (size_t j = 0; j < mesh->Walls[i]->GetPolygonCount(); j++)
                                        {
                                                Polygon *poly = mesh->Walls[i]->GetPolygon(j);
 
                                                if (!poly)
                                                        continue;
 
                                                if (poly->material == material)
                                                {
                                                        //get index offset of mesh
                                                        unsigned int offset = Parent->GetIndexOffset(mesh);
 
                                                        //add mesh's triangles to array and adjust for offset
                                                        for (size_t k = 0; k < poly->triangles.size(); k++)
                                                        {
                                                                Triangle &tri = poly->triangles[k];
                                                                mIndices[loc] = poly_index + tri.a + offset;
                                                                mIndices[loc + 1] = poly_index + tri.b + offset;
                                                                mIndices[loc + 2] = poly_index + tri.c + offset;
                                                                loc += 3;
                                                        }
 
                                                        //increment submesh's client reference count
                                                        submesh->clients += 1;
                                                }
 
                                                poly_index += poly->vertex_count;
                                        }
                                }
                        }
 
                        //create index hardware buffer
                        ibuffer = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(Ogre::HardwareIndexBuffer::IT_16BIT, isize, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
 
                        //write data to index buffer
                        ibuffer->writeData(0, ibuffer->getSizeInBytes(), mIndices, true);
                        delete [] mIndices;
                }
 
                //delete any old index data
                if (submesh->object->indexData)
                {
                        delete submesh->object->indexData;
                        submesh->object->indexData = new Ogre::IndexData();
                }
 
                //bind index data to submesh
                submesh->object->indexData->indexCount = isize;
                submesh->object->indexData->indexBuffer = ibuffer;
                submesh->object->indexData->indexStart = 0;
        }
 
        //mark ogre mesh as dirty to update changes
        MeshWrapper->_dirtyState();
 
        if (process_vertices == true)
        {
                UpdateBoundingBox();
 
                MeshWrapper->load();
 
                //if a mesh was attached and was empty, it needs to be reattached to be visible
                if (previous_count == 0 && enabled == true)
                {
                        Enabled(false);
                        Enabled(true);
                }
        }
 
        prepared = true;
}
 
void DynamicMesh::Mesh::EnableDebugView(bool value)
{
        //enable or disable debug view of mesh
        Movable->setDebugDisplayEnabled(value);
}
 
bool DynamicMesh::Mesh::IsVisible()
{
        //returns true if this mesh is currently visible (enabled, and within the rendering distance)
        return Movable->isVisible();
}
 
bool DynamicMesh::Mesh::IsVisible(Ogre::Camera *camera)
{
        //returns if this mesh is visible in the provided camera's view frustum or not
 
        if (enabled == false || !camera)
                return false;
 
        //if beyond the max render distance
        if (IsVisible() == false)
                return false;
 
        if (GetSubMeshCount() == 0)
                return false;
 
        Ogre::AxisAlignedBox Bounds = MeshWrapper->getBounds();
        if (Bounds.isNull())
                return false;
 
        Vector3 min = Bounds.getMinimum();
        Vector3 max = Bounds.getMaximum();
        Vector3 pos = sbs->ToRemote(node->GetPosition());
        Ogre::AxisAlignedBox global_box (pos + min, pos + max);
 
        return camera->isVisible(global_box);
}
 
void DynamicMesh::Mesh::UpdateVertices(int client, const std::string &material, Polygon *polygon, bool single)
{
        //update/write all vertices (or a single vertex) to the render buffer, if a dynamic mesh
 
        SBS_PROFILE("DynamicMesh::Mesh::UpdateVertices");
 
        if (Parent->UseDynamicBuffers() == false || !node)
                return;
 
        if (prepared == false)
                return;
 
        if (!Parent->GetClient(client))
                return;
 
        bool combined = true;
        if (Parent->GetMeshCount() > 1)
                combined = false;
 
        //get client's offset from offset table
        unsigned int loc = 0;
        if (combined == true)
                loc = client_entries[client].vertex_offset;
 
        MeshObject *mesh = Parent->GetClient(client);
 
        //get mesh's offset of associated scene node
        Vector3 offset = sbs->ToRemote(mesh->GetPosition() - node->GetPosition());
 
        unsigned int vertex_count = mesh->GetVertexCount();
 
        //exit if client mesh is empty or if no walls have been defined
        if (vertex_count == 0 || mesh->Walls.size() == 0)
                return;
 
        //set up vertex data arrays
        float *mVertexElements;
        if (single == true)
                mVertexElements = new float[8];
        else
                mVertexElements = new float[vertex_count * 8];
 
        if (single == false)
        {
                unsigned int count;
 
                if (combined == true)
                        count = client_entries[client].vertex_count;
                else
                        count = client_entries[0].vertex_count;
 
                if (count != vertex_count)
                {
                        delete [] mVertexElements;
                        return; //make sure vertex count is the same
                }
        }
 
        Ogre::AxisAlignedBox box;
 
        //fill array with vertex's data
        unsigned int pos = 0;
        unsigned int add = 0;
 
        for (size_t i = 0; i < mesh->Walls.size(); i++)
        {
                if (!mesh->Walls[i])
                        continue;
 
                //skip empty walls
                if (mesh->Walls[i]->GetPolygonCount() == 0)
                        continue;
 
                for (size_t j = 0; j < mesh->Walls[i]->GetPolygonCount(); j++)
                {
                        Polygon *poly = mesh->Walls[i]->GetPolygon(j);
 
                        if (single == true)
                        {
                                //match material
                                if (poly->material != material)
                                        continue;
 
                                if (poly != polygon)
                                        continue;
                        }
 
                        for (size_t k = 0; k < poly->geometry.size(); k++)
                        {
                                for (size_t l = 0; l < poly->geometry[k].size(); l++)
                                {
                                        Polygon::Geometry &element = poly->geometry[k][l];
 
                                        //make mesh's vertex relative to this scene node
                                        Vector3 raw_vertex = mesh->GetOrientation() * element.vertex; //add mesh's rotation
                                        Vector3 vertex2 = (node->GetOrientation().Inverse() * raw_vertex) + offset; //remove node's rotation and add mesh offset
 
                                        //add elements to array
                                        mVertexElements[pos] = (float)vertex2.x;
                                        mVertexElements[pos + 1] = (float)vertex2.y;
                                        mVertexElements[pos + 2] = (float)vertex2.z;
                                        mVertexElements[pos + 3] = (float)element.normal.x;
                                        mVertexElements[pos + 4] = (float)element.normal.y;
                                        mVertexElements[pos + 5] = (float)element.normal.z;
                                        mVertexElements[pos + 6] = (float)element.texel.x;
                                        mVertexElements[pos + 7] = (float)element.texel.y;
                                        box.merge(vertex2);
                                        pos += 8;
                                        add += 1;
                                }
                        }
                }
        }
 
        //store updated bounding box
        if (combined == true)
                *client_entries[client].bounds = box;
        else
                *client_entries[0].bounds = box;
 
        //get vertex data
        Ogre::VertexData* data = MeshWrapper->sharedVertexData;
 
        //get vertex buffer and size
        Ogre::HardwareVertexBufferSharedPtr vbuffer = data->vertexBufferBinding->getBuffer(0);
        size_t vsize = data->vertexDeclaration->getVertexSize(0);
 
        /*
        //lock vertex buffer for writing
        float *vdata = static_cast<float*>(vbuffer->lock(vsize * loc, vsize * add, Ogre::HardwareBuffer::HBL_NORMAL));
 
        //write elements
        for (int i = 0; i < add; i++)
        {
                vdata[i] = mVertexElements[i];
        }
 
        //unlock vertex buffer
        vbuffer->unlock();
        */
 
        //write data to buffer
        vbuffer->writeData(vsize * loc, vsize * add, mVertexElements, false);
 
        delete [] mVertexElements;
 
        //update mesh bounding box
        UpdateBoundingBox();
}
 
void DynamicMesh::Mesh::Detach()
{
        //detach entity and scene node from this mesh object
 
        if (Movable)
        {
                if (parent_deleting == false)
                        node->DetachObject(Movable);
                sbs->mSceneManager->destroyEntity(Movable);
        }
        Movable = 0;
        node = 0;
}
 
int DynamicMesh::Mesh::GetSubMeshCount()
{
        return MeshWrapper->getNumSubMeshes();
}
 
void DynamicMesh::Mesh::UpdateBoundingBox()
{
        //set mesh's bounding box
 
        if (client_entries.empty() == true)
                return;
 
        if (Parent->GetMeshCount() == 1)
        {
                Ogre::AxisAlignedBox box;
                Real radius = 0;
 
                if (Parent->GetClientCount() != (int)client_entries.size())
                        return;
 
                for (int i = 0; i < Parent->GetClientCount(); i++)
                {
                        box.merge(*client_entries[i].bounds);
                        radius = std::max(radius, client_entries[i].radius);
                }
 
                MeshWrapper->_setBounds(box);
                MeshWrapper->_setBoundingSphereRadius(radius);
        }
        else if (Parent->GetMeshCount() > 1)
        {
                MeshWrapper->_setBounds(*client_entries[0].bounds);
                MeshWrapper->_setBoundingSphereRadius(client_entries[0].radius);
        }
}
 
void DynamicMesh::Mesh::EnableShadows(bool value)
{
        //enable shadows, overriding automatic setting
 
        auto_shadows = false;
        Movable->setCastShadows(value);
}
 
void DynamicMesh::Mesh::SetMaterial(const std::string& material)
{
        //set material of this mesh
 
        Ogre::MaterialPtr mat = sbs->GetTextureManager()->GetMaterialByName(material);
 
        if (mat)
                Movable->setMaterial(mat);
        else
        {
                //set to default material if the specified one is not found
                mat = sbs->GetTextureManager()->GetMaterialByName("Default");
                Movable->setMaterial(mat);
        }
}
 
}