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Copy pathLevelLoader.cpp
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513 lines (450 loc) · 14.1 KB
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// ----------------------------------------------------------------
// From Game Programming in C++ by Sanjay Madhav
// Copyright (C) 2017 Sanjay Madhav. All rights reserved.
//
// Released under the BSD License
// See LICENSE in root directory for full details.
// ----------------------------------------------------------------
#include "LevelLoader.h"
#include <fstream>
#include <vector>
#include <SDL/SDL.h>
#include "Game.h"
#include "Renderer.h"
#include "Actor.h"
#include "BallActor.h"
#include "FollowActor.h"
#include "PlaneActor.h"
#include "TargetActor.h"
#include "Component.h"
#include "AudioComponent.h"
#include "BallMove.h"
#include "BoxComponent.h"
#include "CameraComponent.h"
#include "FollowCamera.h"
#include "MeshComponent.h"
#include "MoveComponent.h"
#include "SkeletalMeshComponent.h"
#include "SpriteComponent.h"
#include "MirrorCamera.h"
#include "PointLightComponent.h"
#include "TargetComponent.h"
#include <rapidjson/stringbuffer.h>
#include <rapidjson/prettywriter.h>
const int LevelVersion = 1;
// Declare map of actors to spawn functions
std::unordered_map<std::string, ActorFunc> LevelLoader::sActorFactoryMap
{
{ "Actor", &Actor::Create<Actor> },
{ "BallActor", &Actor::Create<BallActor> },
{ "FollowActor", &Actor::Create<FollowActor> },
{ "PlaneActor", &Actor::Create<PlaneActor> },
{ "TargetActor", &Actor::Create<TargetActor> },
};
std::unordered_map<std::string, std::pair<int, ComponentFunc>> LevelLoader::sComponentFactoryMap
{
{ "AudioComponent", { Component::TAudioComponent, &Component::Create<AudioComponent>} },
{ "BallMove", { Component::TBallMove, &Component::Create<BallMove> } },
{ "BoxComponent", { Component::TBoxComponent, &Component::Create<BoxComponent> } },
{ "CameraComponent", { Component::TCameraComponent, &Component::Create<CameraComponent> } },
{ "FollowCamera", { Component::TFollowCamera, &Component::Create<FollowCamera> } },
{ "MeshComponent", { Component::TMeshComponent, &Component::Create<MeshComponent> } },
{ "MoveComponent", { Component::TMoveComponent, &Component::Create<MoveComponent> } },
{ "SkeletalMeshComponent", { Component::TSkeletalMeshComponent, &Component::Create<SkeletalMeshComponent> } },
{ "SpriteComponent", { Component::TSpriteComponent, &Component::Create<SpriteComponent> } },
{ "MirrorCamera", { Component::TMirrorCamera, &Component::Create<MirrorCamera> } },
{ "PointLightComponent", { Component::TPointLightComponent, &Component::Create<PointLightComponent> }},
{ "TargetComponent",{ Component::TTargetComponent, &Component::Create<TargetComponent> } },
};
bool LevelLoader::LoadLevel(Game* game, const std::string& fileName)
{
rapidjson::Document doc;
if (!LoadJSON(fileName, doc))
{
SDL_Log("Failed to load level %s", fileName.c_str());
return false;
}
int version = 0;
if (!JsonHelper::GetInt(doc, "version", version) ||
version != LevelVersion)
{
SDL_Log("Incorrect level file version for %s", fileName.c_str());
return false;
}
// Handle any global properties
const rapidjson::Value& globals = doc["globalProperties"];
if (globals.IsObject())
{
LoadGlobalProperties(game, globals);
}
// Handle any actors
const rapidjson::Value& actors = doc["actors"];
if (actors.IsArray())
{
LoadActors(game, actors);
}
return true;
}
bool LevelLoader::LoadJSON(const std::string& fileName, rapidjson::Document& outDoc)
{
// Load the file from disk into an ifstream in binary mode,
// loaded with stream buffer at the end (ate)
std::ifstream file(fileName, std::ios::in | std::ios::binary | std::ios::ate);
if (!file.is_open())
{
SDL_Log("File %s not found", fileName.c_str());
return false;
}
// Get the current position in stream buffer, which is size of file
std::ifstream::pos_type fileSize = file.tellg();
// Seek back to start of file
file.seekg(0, std::ios::beg);
// Create a vector of size + 1 (for null terminator)
std::vector<char> bytes(static_cast<size_t>(fileSize) + 1);
// Read in bytes into vector
file.read(bytes.data(), static_cast<size_t>(fileSize));
// Load raw data into RapidJSON document
outDoc.Parse(bytes.data());
if (!outDoc.IsObject())
{
SDL_Log("File %s is not valid JSON", fileName.c_str());
return false;
}
return true;
}
void LevelLoader::SaveLevel(Game* game, const std::string& fileName)
{
// Create the document and root object
rapidjson::Document doc;
doc.SetObject();
// Write the version
JsonHelper::AddInt(doc.GetAllocator(), doc, "version", LevelVersion);
// Globals
rapidjson::Value globals(rapidjson::kObjectType);
SaveGlobalProperties(doc.GetAllocator(), game, globals);
doc.AddMember("globalProperties", globals, doc.GetAllocator());
// Actors
rapidjson::Value actors(rapidjson::kArrayType);
SaveActors(doc.GetAllocator(), game, actors);
doc.AddMember("actors", actors, doc.GetAllocator());
// Save JSON to string buffer
rapidjson::StringBuffer buffer;
// Use PrettyWriter for pretty output (otherwise use Writer)
rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(buffer);
doc.Accept(writer);
const char* output = buffer.GetString();
// Write output to file
std::ofstream outFile(fileName);
if (outFile.is_open())
{
outFile << output;
}
}
void LevelLoader::LoadGlobalProperties(Game* game, const rapidjson::Value& inObject)
{
// Get ambient light
Vector3 ambient;
if (JsonHelper::GetVector3(inObject, "ambientLight", ambient))
{
game->GetRenderer()->SetAmbientLight(ambient);
}
// Get directional light
const rapidjson::Value& dirObj = inObject["directionalLight"];
if (dirObj.IsObject())
{
DirectionalLight& light = game->GetRenderer()->GetDirectionalLight();
// Set direction/color, if they exist
JsonHelper::GetVector3(dirObj, "direction", light.mDirection);
JsonHelper::GetVector3(dirObj, "color", light.mDiffuseColor);
}
}
void LevelLoader::LoadActors(Game* game, const rapidjson::Value& inArray)
{
// Loop through array of actors
for (rapidjson::SizeType i = 0; i < inArray.Size(); i++)
{
const rapidjson::Value& actorObj = inArray[i];
if (actorObj.IsObject())
{
// Get the type
std::string type;
if (JsonHelper::GetString(actorObj, "type", type))
{
// Is this type in the map?
auto iter = sActorFactoryMap.find(type);
if (iter != sActorFactoryMap.end())
{
// Construct with function stored in map
Actor* actor = iter->second(game, actorObj["properties"]);
// Get the actor's components
if (actorObj.HasMember("components"))
{
const rapidjson::Value& components = actorObj["components"];
if (components.IsArray())
{
LoadComponents(actor, components);
}
}
}
else
{
SDL_Log("Unknown actor type %s", type.c_str());
}
}
}
}
}
void LevelLoader::LoadComponents(Actor* actor, const rapidjson::Value& inArray)
{
// Loop through array of components
for (rapidjson::SizeType i = 0; i < inArray.Size(); i++)
{
const rapidjson::Value& compObj = inArray[i];
if (compObj.IsObject())
{
// Get the type
std::string type;
if (JsonHelper::GetString(compObj, "type", type))
{
auto iter = sComponentFactoryMap.find(type);
if (iter != sComponentFactoryMap.end())
{
// Get the typeid of component
Component::TypeID tid = static_cast<Component::TypeID>(iter->second.first);
// Does the actor already have a component of this type?
Component* comp = actor->GetComponentOfType(tid);
if (comp == nullptr)
{
// It's a new component, call function from map
comp = iter->second.second(actor, compObj["properties"]);
}
else
{
// It already exists, just load properties
comp->LoadProperties(compObj["properties"]);
}
}
else
{
SDL_Log("Unknown component type %s", type.c_str());
}
}
}
}
}
void LevelLoader::SaveGlobalProperties(rapidjson::Document::AllocatorType& alloc,
Game* game, rapidjson::Value& inObject)
{
// Ambient light
JsonHelper::AddVector3(alloc, inObject, "ambientLight",
game->GetRenderer()->GetAmbientLight());
// Directional light
DirectionalLight& dirLight = game->GetRenderer()->GetDirectionalLight();
rapidjson::Value dirObj(rapidjson::kObjectType);
JsonHelper::AddVector3(alloc, dirObj, "direction", dirLight.mDirection);
JsonHelper::AddVector3(alloc, dirObj, "color", dirLight.mDiffuseColor);
inObject.AddMember("directionalLight", dirObj, alloc);
}
void LevelLoader::SaveActors(rapidjson::Document::AllocatorType& alloc,
Game* game, rapidjson::Value& inArray)
{
const auto& actors = game->GetActors();
for (const Actor* actor : actors)
{
// Make a JSON object
rapidjson::Value obj(rapidjson::kObjectType);
// Add type
JsonHelper::AddString(alloc, obj, "type", Actor::TypeNames[actor->GetType()]);
// Make object for properties
rapidjson::Value props(rapidjson::kObjectType);
// Save properties
actor->SaveProperties(alloc, props);
// Add the properties member
obj.AddMember("properties", props, alloc);
// Save components
rapidjson::Value components(rapidjson::kArrayType);
SaveComponents(alloc, actor, components);
obj.AddMember("components", components, alloc);
// Add actor to inArray
inArray.PushBack(obj, alloc);
}
}
void LevelLoader::SaveComponents(rapidjson::Document::AllocatorType& alloc,
const Actor* actor, rapidjson::Value& inArray)
{
const auto& components = actor->GetComponents();
for (const Component* comp : components)
{
// Make a JSON object
rapidjson::Value obj(rapidjson::kObjectType);
// Add type
JsonHelper::AddString(alloc, obj, "type", Component::TypeNames[comp->GetType()]);
// Make an object for properties
rapidjson::Value props(rapidjson::kObjectType);
// Save rest of properties
comp->SaveProperties(alloc, props);
// Add the member
obj.AddMember("properties", props, alloc);
// Add component to array
inArray.PushBack(obj, alloc);
}
}
bool JsonHelper::GetInt(const rapidjson::Value& inObject, const char* inProperty, int& outInt)
{
// Check if this property exists
auto itr = inObject.FindMember(inProperty);
if (itr == inObject.MemberEnd())
{
return false;
}
// Get the value type, and check it's an integer
auto& property = itr->value;
if (!property.IsInt())
{
return false;
}
// We have the property
outInt = property.GetInt();
return true;
}
bool JsonHelper::GetFloat(const rapidjson::Value& inObject, const char* inProperty, float& outFloat)
{
auto itr = inObject.FindMember(inProperty);
if (itr == inObject.MemberEnd())
{
return false;
}
auto& property = itr->value;
if (!property.IsDouble())
{
return false;
}
outFloat = property.GetDouble();
return true;
}
bool JsonHelper::GetString(const rapidjson::Value& inObject, const char* inProperty, std::string& outStr)
{
auto itr = inObject.FindMember(inProperty);
if (itr == inObject.MemberEnd())
{
return false;
}
auto& property = itr->value;
if (!property.IsString())
{
return false;
}
outStr = property.GetString();
return true;
}
bool JsonHelper::GetBool(const rapidjson::Value& inObject, const char* inProperty, bool& outBool)
{
auto itr = inObject.FindMember(inProperty);
if (itr == inObject.MemberEnd())
{
return false;
}
auto& property = itr->value;
if (!property.IsBool())
{
return false;
}
outBool = property.GetBool();
return true;
}
bool JsonHelper::GetVector3(const rapidjson::Value& inObject, const char* inProperty, Vector3& outVector)
{
auto itr = inObject.FindMember(inProperty);
if (itr == inObject.MemberEnd())
{
return false;
}
auto& property = itr->value;
if (!property.IsArray() || property.Size() != 3)
{
return false;
}
for (rapidjson::SizeType i = 0; i < 3; i++)
{
if (!property[i].IsDouble())
{
return false;
}
}
outVector.x = property[0].GetDouble();
outVector.y = property[1].GetDouble();
outVector.z = property[2].GetDouble();
return true;
}
bool JsonHelper::GetQuaternion(const rapidjson::Value& inObject, const char* inProperty, Quaternion& outQuat)
{
auto itr = inObject.FindMember(inProperty);
if (itr == inObject.MemberEnd())
{
return false;
}
auto& property = itr->value;
for (rapidjson::SizeType i = 0; i < 4; i++)
{
if (!property[i].IsDouble())
{
return false;
}
}
outQuat.x = property[0].GetDouble();
outQuat.y = property[1].GetDouble();
outQuat.z = property[2].GetDouble();
outQuat.w = property[3].GetDouble();
return true;
}
void JsonHelper::AddInt(rapidjson::Document::AllocatorType& alloc,
rapidjson::Value& inObject, const char* name, int value)
{
rapidjson::Value v(value);
inObject.AddMember(rapidjson::StringRef(name), v, alloc);
}
void JsonHelper::AddFloat(rapidjson::Document::AllocatorType& alloc,
rapidjson::Value& inObject, const char* name, float value)
{
rapidjson::Value v(value);
inObject.AddMember(rapidjson::StringRef(name), v, alloc);
}
void JsonHelper::AddString(rapidjson::Document::AllocatorType& alloc,
rapidjson::Value& inObject, const char* name, const std::string& value)
{
rapidjson::Value v;
v.SetString(value.c_str(), static_cast<rapidjson::SizeType>(value.length()),
alloc);
inObject.AddMember(rapidjson::StringRef(name), v, alloc);
}
void JsonHelper::AddBool(rapidjson::Document::AllocatorType& alloc,
rapidjson::Value& inObject, const char* name, bool value)
{
rapidjson::Value v(value);
inObject.AddMember(rapidjson::StringRef(name), v, alloc);
}
void JsonHelper::AddVector3(rapidjson::Document::AllocatorType& alloc,
rapidjson::Value& inObject, const char* name, const Vector3& value)
{
// Create an array
rapidjson::Value v(rapidjson::kArrayType);
// Push back elements
v.PushBack(rapidjson::Value(value.x).Move(), alloc);
v.PushBack(rapidjson::Value(value.y).Move(), alloc);
v.PushBack(rapidjson::Value(value.z).Move(), alloc);
// Add array to inObject
inObject.AddMember(rapidjson::StringRef(name), v, alloc);
}
void JsonHelper::AddQuaternion(rapidjson::Document::AllocatorType& alloc,
rapidjson::Value& inObject, const char* name, const Quaternion& value)
{
// Create an array
rapidjson::Value v(rapidjson::kArrayType);
// Push back elements
v.PushBack(rapidjson::Value(value.x).Move(), alloc);
v.PushBack(rapidjson::Value(value.y).Move(), alloc);
v.PushBack(rapidjson::Value(value.z).Move(), alloc);
v.PushBack(rapidjson::Value(value.w).Move(), alloc);
// Add array to inObject
inObject.AddMember(rapidjson::StringRef(name), v, alloc);
}
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