SQCSimulator2023/SQCSim2021/engine.cpp

#include "engine.h"

Engine::Engine() {}

Engine::~Engine() {
	m_world.CleanUpWorld(m_renderCount, true);
	for (int x = 0; x < WORLD_SIZE_X; ++x)
		for (int y = 0; y < WORLD_SIZE_Y; ++y)
			if (m_world.GetChunks().Get(x, y))
				m_world.GetChunks().Get(x, y)->~Chunk();
}

void Engine::Init() {
	GLenum glewErr = glewInit();
	if (glewErr != GLEW_OK) {
		std::cerr << " ERREUR GLEW : " << glewGetErrorString(glewErr) << std::endl;
		abort();
	}

	//glDisable(GL_FRAMEBUFFER_SRGB);
	//glEnable(GL_DEPTH_TEST);
	//glEnable(GL_STENCIL_TEST);
	//glEnable(GL_POINT_SMOOTH);
	//glEnable(GL_BLEND);
	glEnable(GL_CULL_FACE);
	glEnable(GL_TEXTURE_2D);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	gluPerspective(45.0f, (float)Width() / (float)Height(), 0.1f, VIEW_DISTANCE);
	glShadeModel(GL_SMOOTH);

	//glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	//glDisable(GL_BLEND);
	//glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	//glBlendEquation(GL_FUNC_SUBTRACT);
	// 
	// Objet de skybox avec sa propre texture et son propre shader!
	m_skybox.Init(0.2f);

	// Objet de musique!
	m_audio.ToggleMusicState();

	// Array pour les balles.
	for (int x = 0; x < MAX_BULLETS; ++x)
		m_bullets[x] = nullptr;

	uint64_t seed = 12345;
	std::string playname = "John Test";
	const char srvaddr[] = "127.0.0.1";
	if (NETWORK_TEST) { // Test connexion r<>seau.
		sockaddr_in addr;
		addr.sin_family = AF_INET;
		addr.sin_port = htons(SRV_PORT);
		addr.sin_addr.s_addr = inet_addr(srvaddr);
		
		if (!m_conn->Init(addr)) {
			if (m_conn->Connect(playname)) {
				// setup jeu en r<>seau.
				seed = m_conn->getSeed();
				std::cout << "ID re<72>u du serveur: " << std::to_string(m_conn->getId()) << "!" << std::endl;
			}
			else std::cout << "Erreur de connexion." << std::endl;
		}
		else std::cout << "Erreur de cr<63>ation de socket." << std::endl;
	}

	m_world.SetSeed(seed);

	// Init Chunks
	m_world.GetChunks().Reset(nullptr);

	// Gestion de souris.
	CenterMouse();
	HideCursor();
}

void Engine::DeInit() {}

void Engine::LoadResource() {
	LoadTexture(m_skybox.GetTexture(), TEXTURE_PATH "skybox.png", true);
	LoadTexture(m_textureCrosshair, TEXTURE_PATH "cross.bmp", true);
	LoadTexture(m_textureFont, TEXTURE_PATH "font.bmp", true);
	LoadTexture(m_textureGun, TEXTURE_PATH "gun01.png", false);

	TextureAtlas::TextureIndex texDirtIndex = m_textureAtlas.AddTexture(TEXTURE_PATH "metal3.png");
	TextureAtlas::TextureIndex texIceIndex = m_textureAtlas.AddTexture(TEXTURE_PATH "metal2.png");
	TextureAtlas::TextureIndex texGrassIndex = m_textureAtlas.AddTexture(TEXTURE_PATH "grass.png");
	TextureAtlas::TextureIndex texMetalIndex = m_textureAtlas.AddTexture(TEXTURE_PATH "dirt.png");

	if (!m_textureAtlas.Generate(TEXTURE_SIZE, false)) {
		std::cout << " Unable to generate texture atlas ..." << std::endl;
		abort();
	}

	float u, v, s;
	m_textureAtlas.TextureIndexToCoord(texDirtIndex, u, v, s, s);
	m_blockinfo[BTYPE_DIRT] = new BlockInfo(BTYPE_DIRT, "Dirt", u, v, s, 1);
	m_textureAtlas.TextureIndexToCoord(texGrassIndex, u, v, s, s);
	m_blockinfo[BTYPE_GRASS] = new BlockInfo(BTYPE_GRASS, "Grass", u, v, s, 1);
	m_textureAtlas.TextureIndexToCoord(texMetalIndex, u, v, s, s);
	m_blockinfo[BTYPE_METAL] = new BlockInfo(BTYPE_METAL, "Metal", u, v, s, 1);
	m_textureAtlas.TextureIndexToCoord(texIceIndex, u, v, s, s);
	m_blockinfo[BTYPE_ICE] = new BlockInfo(BTYPE_ICE, "Ice", u, v, s, 1);

	std::cout << " Loading and compiling shaders ..." << std::endl;
	if (!m_shader01.Load(SHADER_PATH "shader01.vert", SHADER_PATH "shader01.frag", true)) {
		std::cout << " Failed to load shader " << std::endl;
		exit(1);
	}

	if (!m_skybox.GetShader().Load(SHADER_PATH "skybox.vert", SHADER_PATH "skybox.frag", true)) {
		std::cout << " Failed to load shader " << std::endl;
		exit(1);
	}
}

void Engine::UnloadResource() {}

void Engine::DisplayCrosshair() {
	m_textureCrosshair.Bind();
	static const int crossSize = 32;
	glLoadIdentity();
	glTranslated(Width() / 2 - crossSize / 2, Height() / 2 - crossSize / 2, 0);
	glBegin(GL_QUADS);
		glTexCoord2f(0, 0);
		glVertex2i(0, 0);
		glTexCoord2f(1, 0);
		glVertex2i(crossSize, 0);
		glTexCoord2f(1, 1);
		glVertex2i(crossSize, crossSize);
		glTexCoord2f(0, 1);
		glVertex2i(0, crossSize);
	glEnd();
}

void Engine::DisplayCurrentItem() {
}

void Engine::DisplayHud() {
	glBindTexture(GL_TEXTURE_2D, 0);
	glLoadIdentity();
	glDisable(GL_BLEND);

	// Barre HP
	float fBarWidth = Width() / 4;
	float fBarHeight = Height() / 25;
	float fPosX = Width() / 20;
	float fPosY = Height() - (Height() - (fBarHeight * 4));
	float playerHp = m_player.GetHP();
	float facteurOmbrage = m_displayInfo ? 0.5f : 1.0f;

	// Arri<72>re-plan (Barre HP)
	glColor3f(1.0f * facteurOmbrage, 1.0f * facteurOmbrage, 1.0f * facteurOmbrage);
	glBegin(GL_QUADS);
		glVertex2f(fPosX, fPosY - fBarHeight);				// Bas-Gauche
		glVertex2f(fPosX + fBarWidth, fPosY - fBarHeight);  // Bas-Droite
		glVertex2f(fPosX + fBarWidth, fPosY);				// Haut-Droite
		glVertex2f(fPosX, fPosY);							// Haut-Gauche
	glEnd();

	//TODO: Associer avec m<>chanique de vie du joueur

	// Barre HP
	glColor3f(0.0f * facteurOmbrage, 1.0f * facteurOmbrage, 0.0f * facteurOmbrage);
	glBegin(GL_QUADS);
		glVertex2f(fPosX, fPosY - fBarHeight);							// Bas-Gauche
		glVertex2f(fPosX + fBarWidth * playerHp, fPosY - fBarHeight);	// Bas-Droite
		glVertex2f(fPosX + fBarWidth * playerHp, fPosY);				// Haut-Droite
		glVertex2f(fPosX, fPosY);										// Haut-Gauche
	glEnd();

	// Barre <20>quip
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glColor3f(1.0f * facteurOmbrage, 1.0f * facteurOmbrage, 1.0f * facteurOmbrage);
	m_textureGun.Bind();

	float margin = Width() * 0.05;
	float itemWidth = Width() * 0.33;
	float itemHeight = itemWidth / 2.208;
	float startX = Width() - itemWidth - margin;
	float startY = margin;

	glTranslated(startX, startY, 0);

	glBegin(GL_QUADS);
	glTexCoord2f(1, 0); glVertex2i(0, 0);
	glTexCoord2f(0, 0); glVertex2i(itemWidth, 0);
	glTexCoord2f(0, 1); glVertex2i(itemWidth, itemHeight);
	glTexCoord2f(1, 1); glVertex2i(0, itemHeight);
	glEnd();

	glDisable(GL_BLEND);

	// Username
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE);

	glColor3f(1.0f, 1.0f, 1.0f);
	float scale = GetScale();
	m_textureFont.Bind();
	std::ostringstream ss;
	ss << m_player.GetUsername();
	PrintText(fPosX, fPosY, scale, ss.str());
}

void Engine::DisplayInfo(float elapsedTime, BlockType bloc) {
	// Bind de la texture pour le font
	m_textureFont.Bind();
	std::ostringstream ss;

	float scale = GetScale();
	unsigned int x = Width() / 25;

	ss << " Fps : " << GetFps(elapsedTime);
	PrintText(x, Height() - (Height() / 19.2), scale, ss.str());
	ss.str("");
	ss << " Rendered Chunks : " << m_renderCount;
	PrintText(x, Height() - (Height() / 13.7), scale, ss.str());
	ss.str("");
	ss << " To-Be-Deleted Chunks : " << m_world.GettbDeleted();
	PrintText(x, Height() - (Height() / 10.7), scale, ss.str());
	ss.str("");
	ss << " Velocity  : " << m_player.GetVelocity(); // IMPORTANT : on utilise l <20> operateur << pour afficher la position
	PrintText(x, Height() / 48, scale, ss.str());
	ss.str("");
	ss << " Direction : " << m_player.GetDirection();
	PrintText(x, Height() / 24, scale, ss.str());
	ss.str("");
	ss << " Position  : " << m_player.GetPosition();
	PrintText(x, Height() / 16, scale, ss.str());
	ss.str("");
	ss << " Block  : ";

	if (bloc == BTYPE_LAST)
		ss << "Weapon.";
	else ss << (int)bloc;

	PrintText(x, Height() / 12, scale, ss.str());
}

void Engine::DrawHud(float elapsedTime, BlockType bloc) {
	// Setter le blend function, tout ce qui sera noir sera transparent
	glDisable(GL_STENCIL_TEST);
	glDisable(GL_DEPTH_TEST);

	glBlendFunc(GL_SRC_ALPHA, GL_ONE);
	glBlendEquation(GL_FUNC_ADD);

	glMatrixMode(GL_PROJECTION);
	glPushMatrix();

	glLoadIdentity();
	glOrtho(0, Width(), 0, Height(), -1, 1);

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();


	if (m_displayInfo) {
		DisplayInfo(elapsedTime, bloc);
	}

	if (m_displayHud) {
		DisplayHud();
	}

	if (m_displayCrosshair) {
		DisplayCrosshair();
	}

	// Reset du blend function
	glBlendFunc(GL_CONSTANT_COLOR, GL_ONE_MINUS_CONSTANT_COLOR);
	glBlendEquation(GL_FUNC_SUBTRACT);

	glEnable(GL_STENCIL_TEST);
	glEnable(GL_DEPTH_TEST);

	glMatrixMode(GL_PROJECTION);
	glPopMatrix();

	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
}

void Engine::PrintText(float x, float y, float scale, const std::string& t) {
	glLoadIdentity();
	glTranslated(x, y, 0);

	for (unsigned int i = 0; i < t.length(); ++i) {
		float left = (float)((t[i] - 32) % 16) / 16.f;
		float top = (float)((t[i] - 32) / 16) / 16.f;
		top += .5f;

		glBegin(GL_QUADS);
			glTexCoord2f(left, 1.f - top - .0625f);			 glVertex2f(0, 0);
			glTexCoord2f(left + .0625f, 1.f - top - .0625f); glVertex2f(12 * scale, 0);
			glTexCoord2f(left + .0625f, 1.f - top);			 glVertex2f(12 * scale, 12 * scale);
			glTexCoord2f(left, 1.f - top);					 glVertex2f(0, 12 * scale);
		glEnd();

		glTranslated(8 * scale, 0, 0);
	}
}

float Engine::GetScale() const {
	float widthRatio = Width() / BASE_WIDTH;
	float heightRatio = Height() / BASE_HEIGHT;

	return (widthRatio + heightRatio) / 2.0f;
}

int Engine::GetFps(float elapsedTime) const { return 1 / elapsedTime; }

void Engine::Render(float elapsedTime) {
	//static float gameTime = elapsedTime;
	static float pollTime = 0;
	static float bulletTime = 0;
	static BlockType bloc = 1;

	if (elapsedTime > 0.1f) return;

	//gameTime += elapsedTime;
	pollTime += elapsedTime;

	Transformation all;
	Transformation skybox;
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

	// Transformations initiales
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	if (bulletTime > 0.f) bulletTime -= elapsedTime;
	if (bulletTime < 0.f) bulletTime = 0.f;

	if (pollTime >= .005f) {
		m_player.ApplyPhysics(m_player.GetInput(m_keyW, m_keyS, m_keyA, m_keyD, m_keySpace, (bloc == BTYPE_LAST && bulletTime <= 0.f && m_mouseL), elapsedTime), &m_world, elapsedTime, &m_audio);
		m_audio.Update3DAudio(m_player.GetPOV(), m_player.GetDirection(), m_player.GetVelocity()); // Ajustement du positionnement 3D avec les coordonn<6E>es du joueur et
		// son vecteur de v<>locit<69> (pour l'effet Doppler)
		pollTime = 0;
	}

	m_player.ApplyTransformation(all);

	m_player.ApplyTransformation(skybox, false); // Version d'ApplyTransformation qui ne tient compte que de la rotation 
	// (donc l'objet ne bouge pas relativement au joueur, ce qui est pratique pour une skybox!).

	if (m_mouseWU) bloc++;
	else if (m_mouseWD) bloc--;
	if (bloc == BTYPE_LAST + 1) bloc = BTYPE_AIR + 1;
	else if (bloc == BTYPE_AIR) bloc = BTYPE_LAST; // La selection de BTYPE_LAST <20>quipe l'arme.
	m_mouseWU = m_mouseWD = false;

	if (m_mouseL) {
		if (bloc != BTYPE_LAST)
			m_world.ChangeBlockAtCursor(bloc, m_player, m_block);
		else if (bulletTime <= 0.f) {
			for (int x = 0; x < MAX_BULLETS; ++x)  // Ajouter une balle dans l'array (aussi connu sous le nom de "faire pow pow").
				if (!m_bullets[x]) {
					m_bullets[x] = new Bullet(m_player);
					break;
				}
				else if (x == MAX_BULLETS - 1) { // S'il y a pas d'espace dans l'array, prendre la place de la premi<6D>re balle de l'array.
					m_bullets[0]->~Bullet();
					m_bullets[0] = new Bullet(m_player);
				}
			bulletTime = .1f;
			m_audio.Create3DAudioObj(m_powpow, AUDIO_PATH "windowsaccount.wav", m_player.GetPOV(), m_player.GetDirection() * 10, .5f);
			if (m_flash) { // Coupe le rendering et affiche un frame blanc, pour simuler un flash.
				glClearColor(.8f, .8f, .8f, 1.f);
				glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
				glClearColor(0.f, 0.f, 0.f, 1.f);
				return;
			}
		}
	}
	else if (m_mouseR)
		m_world.ChangeBlockAtCursor(BTYPE_AIR, m_player, m_block);

	for (int x = 0; x < MAX_BULLETS; ++x) // Array de bullets en jeu.
		if (m_bullets[x])
			if (m_bullets[x]->Update(&m_world, all, elapsedTime)) {
				m_bullets[x]->~Bullet();
				m_bullets[x] = nullptr;
			}

	m_world.Update(m_renderCount, m_bullets, m_player, all, m_shader01, m_textureAtlas, m_blockinfo);

	if (m_isSkybox) m_skybox.Render(skybox);

	DrawHud(elapsedTime, bloc);
	
	static bool fell = false;
	if (m_player.GetPosition().y < 1.7f && !fell) {
		m_audio.Create3DAudioObj(m_scream, AUDIO_PATH "scream.wav", m_player.GetPOV(), m_player.GetVelocity(), 1.f);
		fell = true;
	}
	else if (m_player.GetPosition().y < -20.f) {
		m_player = Player(Vector3f(.5f, CHUNK_SIZE_Y + 1.8f, .5f)); // Respawn si le bonho- joueur tombe en bas du monde.
		fell = false;
	}
}

void Engine::KeyPressEvent(unsigned char key) {
	switch (key) {
	case 0: // A - Gauche
		if (!m_keyA) {
			m_keyA = true;
		}
		break;
	case 3: // D - Droite
		if (!m_keyD) {
			m_keyD = true;
		}
		break;
	case 18: // S - Reculer
		if (!m_keyS) {
			m_keyS = true;
		}
		break;
	case 22: // W - Avancer
		if (!m_keyW) {
			m_keyW = true;
		}
		break;
	case 36: // ESC - Quitter
		Stop();
		break;
	case 57: // Space - Sauter
		if (!m_keySpace) {
			m_keySpace = true;
		}
		break;
	case 94: // F10 - Plein <20>cran
		IsFullscreen() ? SetFullscreen(false) : SetFullscreen(true);
		//SetFullscreen(!IsFullscreen());
		break;
	case 2: // C - Ignorer
		break;
	case 5: // F - Ignorer
		break;
	case 12: // M - Ignorer
		break;
	case 7: // H - Ignorer
		break;
	case 8: // I - Ignorer
		break;
	case 17: // R - Ignorer
		break;
	case 24: // Y - Ignorer
		break;
	case 255: // Fn - Ignorer
		break;
	default:
		std::cout << "Unhandled key: " << (int)key << std::endl;
	}
}

void Engine::KeyReleaseEvent(unsigned char key) {
	switch (key) {
	case 0: // A - Stop gauche
		m_keyA = false;
		break;
	case 2: // C - Toggle crosshair
		m_displayCrosshair = !m_displayCrosshair;
		std::cout << "DISPLAY CROSSHAIR " << (m_displayCrosshair ? "enabled" : "disabled") << std::endl;
		break;
	case 3: // D - Stop droite
		m_keyD = false;
		break;
	case 5: // F - Toggle flash
		m_flash = !m_flash;
		break;
	case 7: // H - Toggle HUD
		m_displayHud = !m_displayHud;
		std::cout << "DISPLAY HUD " << (m_displayHud ? "enabled" : "disabled") << std::endl;
		break;
	case 8: // I - Toggle render data
		m_displayInfo = !m_displayInfo;
		std::cout << "DISPLAY INFO " << (m_displayInfo ? "enabled" : "disabled") << std::endl;
		break;
	case 12: // M - Toggle music
		m_audio.ToggleMusicState();
		break;
	case 17: // R - Toggle skybox
		m_isSkybox = !m_isSkybox;
		break;
	case 18: // S - Stop reculer
		m_keyS = false;
		break;
	case 22: // W - Stop avancer
		m_keyW = false;
		break;
	case 24: // Y - Wireframe
		m_wireframe = !m_wireframe;
		if (m_wireframe)
			glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
		else
			glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
		break;
	case 57: // Espace - Stop sauter
		m_keySpace = false;
		break;
	}
}

void Engine::MouseMoveEvent(int x, int y) {
	m_player.TurnLeftRight(x - (Width() / 2));
	m_player.TurnTopBottom(y - (Height() / 2));

	// Centrer la souris seulement si elle n'est pas d<>j<EFBFBD> centr<74>e
	// Il est n<>cessaire de faire la v<>rification pour <20>viter de tomber
	// dans une boucle infinie o<> l'appel <20> CenterMouse g<>n<EFBFBD>re un
	// MouseMoveEvent, qui rapelle CenterMouse qui rapelle un autre
	// MouseMoveEvent, etc
	if (x == (Width() / 2) && y == (Height() / 2))
		return;

	CenterMouse();
}

void Engine::MousePressEvent(const MOUSE_BUTTON& button, int x, int y) {
	switch (button) {
	case MOUSE_BUTTON_LEFT:
		m_mouseL = true;
		break;
	case MOUSE_BUTTON_RIGHT:
		m_mouseR = true;
		break;
	case MOUSE_BUTTON_MIDDLE:
		m_mouseC = true;
		break;
	case MOUSE_BUTTON_WHEEL_UP:
		m_mouseWU = true;
		break;
	case MOUSE_BUTTON_WHEEL_DOWN:
		m_mouseWD = true;
		break;
	case MOUSE_BUTTON_NONE: break;
	}
}

void Engine::MouseReleaseEvent(const MOUSE_BUTTON& button, int x, int y) {
	switch (button) {
	case MOUSE_BUTTON_LEFT:
		m_mouseL = false;
		m_block = false;
		break;
	case MOUSE_BUTTON_RIGHT:
		m_mouseR = false;
		m_block = false;
		break;
	case MOUSE_BUTTON_MIDDLE:
		m_mouseC = false;
		break;
	case MOUSE_BUTTON_WHEEL_UP:
		m_mouseWU = false;
		break;
	case MOUSE_BUTTON_WHEEL_DOWN:
		m_mouseWD = false;
		break;
	case MOUSE_BUTTON_NONE: break;
	}
}

bool Engine::LoadTexture(Texture& texture, const std::string& filename, bool useMipmaps, bool stopOnError) {
	texture.Load(filename, useMipmaps);
	if (!texture.IsValid()) {
		std::cerr << "Unable to load texture (" << filename << ")" << std::endl;
		if (stopOnError)
			Stop();

		return false;
	}

	return true;
}