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Copy pathGame.cpp
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511 lines (465 loc) · 9.05 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 "Game.h"
#include <algorithm>
#include "Renderer.h"
#include "AudioSystem.h"
#include "PhysWorld.h"
#include "Actor.h"
#include "UIScreen.h"
#include "HUD.h"
#include "MeshComponent.h"
#include "FollowActor.h"
#include "PlaneActor.h"
#include "TargetActor.h"
#include "BallActor.h"
#include "PauseMenu.h"
#include <SDL/SDL.h>
#include <SDL/SDL_ttf.h>
#include "Font.h"
#include <rapidjson/document.h>
#include "Skeleton.h"
#include "Animation.h"
#include "PointLightComponent.h"
#include "LevelLoader.h"
Game::Game()
:mRenderer(nullptr)
,mAudioSystem(nullptr)
,mPhysWorld(nullptr)
,mGameState(EGameplay)
,mUpdatingActors(false)
{
}
bool Game::Initialize()
{
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO) != 0)
{
SDL_Log("Unable to initialize SDL: %s", SDL_GetError());
return false;
}
// Create the renderer
mRenderer = new Renderer(this);
if (!mRenderer->Initialize(1024.0f, 768.0f))
{
SDL_Log("Failed to initialize renderer");
delete mRenderer;
mRenderer = nullptr;
return false;
}
// Create the audio system
mAudioSystem = new AudioSystem(this);
if (!mAudioSystem->Initialize())
{
SDL_Log("Failed to initialize audio system");
mAudioSystem->Shutdown();
delete mAudioSystem;
mAudioSystem = nullptr;
return false;
}
// Create the physics world
mPhysWorld = new PhysWorld(this);
// Initialize SDL_ttf
if (TTF_Init() != 0)
{
SDL_Log("Failed to initialize SDL_ttf");
return false;
}
LoadData();
mTicksCount = SDL_GetTicks();
return true;
}
void Game::RunLoop()
{
while (mGameState != EQuit)
{
ProcessInput();
UpdateGame();
GenerateOutput();
}
}
void Game::ProcessInput()
{
SDL_Event event;
while (SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
mGameState = EQuit;
break;
// This fires when a key's initially pressed
case SDL_KEYDOWN:
if (!event.key.repeat)
{
if (mGameState == EGameplay)
{
HandleKeyPress(event.key.keysym.sym);
}
else if (!mUIStack.empty())
{
mUIStack.back()->
HandleKeyPress(event.key.keysym.sym);
}
}
break;
case SDL_MOUSEBUTTONDOWN:
if (mGameState == EGameplay)
{
HandleKeyPress(event.button.button);
}
else if (!mUIStack.empty())
{
mUIStack.back()->
HandleKeyPress(event.button.button);
}
break;
default:
break;
}
}
const Uint8* state = SDL_GetKeyboardState(NULL);
if (mGameState == EGameplay)
{
for (auto actor : mActors)
{
if (actor->GetState() == Actor::EActive)
{
actor->ProcessInput(state);
}
}
}
else if (!mUIStack.empty())
{
mUIStack.back()->ProcessInput(state);
}
}
void Game::HandleKeyPress(int key)
{
switch (key)
{
case SDLK_ESCAPE:
// Create pause menu
new PauseMenu(this);
break;
case '-':
{
// Reduce master volume
float volume = mAudioSystem->GetBusVolume("bus:/");
volume = Math::Max(0.0f, volume - 0.1f);
mAudioSystem->SetBusVolume("bus:/", volume);
break;
}
case '=':
{
// Increase master volume
float volume = mAudioSystem->GetBusVolume("bus:/");
volume = Math::Min(1.0f, volume + 0.1f);
mAudioSystem->SetBusVolume("bus:/", volume);
break;
}
case '1':
{
// Load English text
LoadText("Assets/English.gptext");
break;
}
case '2':
{
// Load Russian text
LoadText("Assets/Russian.gptext");
break;
}
case 'r':
{
// Save level
LevelLoader::SaveLevel(this, "Assets/Saved.gplevel");
break;
}
case SDL_BUTTON_LEFT:
{
break;
}
default:
break;
}
}
void Game::UpdateGame()
{
// Compute delta time
// Wait until 16ms has elapsed since last frame
while (!SDL_TICKS_PASSED(SDL_GetTicks(), mTicksCount + 16))
;
float deltaTime = (SDL_GetTicks() - mTicksCount) / 1000.0f;
if (deltaTime > 0.05f)
{
deltaTime = 0.05f;
}
mTicksCount = SDL_GetTicks();
if (mGameState == EGameplay)
{
// Update all actors
mUpdatingActors = true;
for (auto actor : mActors)
{
actor->Update(deltaTime);
}
mUpdatingActors = false;
// Move any pending actors to mActors
for (auto pending : mPendingActors)
{
pending->ComputeWorldTransform();
mActors.emplace_back(pending);
}
mPendingActors.clear();
// Add any dead actors to a temp vector
std::vector<Actor*> deadActors;
for (auto actor : mActors)
{
if (actor->GetState() == Actor::EDead)
{
deadActors.emplace_back(actor);
}
}
// Delete dead actors (which removes them from mActors)
for (auto actor : deadActors)
{
delete actor;
}
}
// Update audio system
mAudioSystem->Update(deltaTime);
// Update UI screens
for (auto ui : mUIStack)
{
if (ui->GetState() == UIScreen::EActive)
{
ui->Update(deltaTime);
}
}
// Delete any UIScreens that are closed
auto iter = mUIStack.begin();
while (iter != mUIStack.end())
{
if ((*iter)->GetState() == UIScreen::EClosing)
{
delete *iter;
iter = mUIStack.erase(iter);
}
else
{
++iter;
}
}
}
void Game::GenerateOutput()
{
mRenderer->Draw();
}
void Game::LoadData()
{
// Load English text
LoadText("Assets/English.gptext");
// Create HUD
mHUD = new HUD(this);
// Load the level from file
LevelLoader::LoadLevel(this, "Assets/Level3.gplevel");
// Start music
mMusicEvent = mAudioSystem->PlayEvent("event:/Music");
// Enable relative mouse mode for camera look
SDL_SetRelativeMouseMode(SDL_TRUE);
// Make an initial call to get relative to clear out
SDL_GetRelativeMouseState(nullptr, nullptr);
}
void Game::UnloadData()
{
// Delete actors
// Because ~Actor calls RemoveActor, have to use a different style loop
while (!mActors.empty())
{
delete mActors.back();
}
// Clear the UI stack
while (!mUIStack.empty())
{
delete mUIStack.back();
mUIStack.pop_back();
}
if (mRenderer)
{
mRenderer->UnloadData();
}
// Unload fonts
for (auto f : mFonts)
{
f.second->Unload();
delete f.second;
}
// Unload skeletons
for (auto s : mSkeletons)
{
delete s.second;
}
// Unload animations
for (auto a : mAnims)
{
delete a.second;
}
}
void Game::Shutdown()
{
UnloadData();
TTF_Quit();
delete mPhysWorld;
if (mRenderer)
{
mRenderer->Shutdown();
}
if (mAudioSystem)
{
mAudioSystem->Shutdown();
}
SDL_Quit();
}
void Game::AddActor(Actor* actor)
{
// If we're updating actors, need to add to pending
if (mUpdatingActors)
{
mPendingActors.emplace_back(actor);
}
else
{
mActors.emplace_back(actor);
}
}
void Game::RemoveActor(Actor* actor)
{
// Is it in pending actors?
auto iter = std::find(mPendingActors.begin(), mPendingActors.end(), actor);
if (iter != mPendingActors.end())
{
// Swap to end of vector and pop off (avoid erase copies)
std::iter_swap(iter, mPendingActors.end() - 1);
mPendingActors.pop_back();
}
// Is it in actors?
iter = std::find(mActors.begin(), mActors.end(), actor);
if (iter != mActors.end())
{
// Swap to end of vector and pop off (avoid erase copies)
std::iter_swap(iter, mActors.end() - 1);
mActors.pop_back();
}
}
void Game::PushUI(UIScreen* screen)
{
mUIStack.emplace_back(screen);
}
Font* Game::GetFont(const std::string& fileName)
{
auto iter = mFonts.find(fileName);
if (iter != mFonts.end())
{
return iter->second;
}
else
{
Font* font = new Font(this);
if (font->Load(fileName))
{
mFonts.emplace(fileName, font);
}
else
{
font->Unload();
delete font;
font = nullptr;
}
return font;
}
}
void Game::LoadText(const std::string& fileName)
{
// Clear the existing map, if already loaded
mText.clear();
rapidjson::Document doc;
if (!LevelLoader::LoadJSON(fileName, doc))
{
SDL_Log("Failed to load text file %s", fileName.c_str());
return;
}
// Parse the text map
const rapidjson::Value& actions = doc["TextMap"];
for (rapidjson::Value::ConstMemberIterator itr = actions.MemberBegin();
itr != actions.MemberEnd(); ++itr)
{
if (itr->name.IsString() && itr->value.IsString())
{
mText.emplace(itr->name.GetString(),
itr->value.GetString());
}
}
}
const std::string& Game::GetText(const std::string& key)
{
static std::string errorMsg("**KEY NOT FOUND**");
// Find this text in the map, if it exists
auto iter = mText.find(key);
if (iter != mText.end())
{
return iter->second;
}
else
{
return errorMsg;
}
}
Skeleton* Game::GetSkeleton(const std::string& fileName)
{
auto iter = mSkeletons.find(fileName);
if (iter != mSkeletons.end())
{
return iter->second;
}
else
{
Skeleton* sk = new Skeleton();
if (sk->Load(fileName))
{
mSkeletons.emplace(fileName, sk);
}
else
{
delete sk;
sk = nullptr;
}
return sk;
}
}
Animation* Game::GetAnimation(const std::string& fileName)
{
auto iter = mAnims.find(fileName);
if (iter != mAnims.end())
{
return iter->second;
}
else
{
Animation* anim = new Animation();
if (anim->Load(fileName))
{
mAnims.emplace(fileName, anim);
}
else
{
delete anim;
anim = nullptr;
}
return anim;
}
}