/*******************************************************************
** This code is part of Breakout.
**
** Breakout is free software: you can redistribute it and/or modify
** it under the terms of the CC BY 4.0 license as published by
** Creative Commons, either version 4 of the License, or (at your
** option) any later version.
******************************************************************/
#include "game.h"
#include "resource_manager.h"
#include "sprite_renderer.h"
#include "game_object.h"
#include "ball_object.h"
#include "particle_generator.h"
// Game-related State data
SpriteRenderer *Renderer;
GameObject *Player;
BallObject *Ball;
ParticleGenerator *Particles;
Game::Game(GLuint width, GLuint height)
: State(GAME_ACTIVE), Keys(), Width(width), Height(height)
{
}
Game::~Game()
{
delete Renderer;
delete Player;
delete Ball;
delete Particles;
}
void Game::Init()
{
// Load shaders
ResourceManager::LoadShader("shaders/sprite.vs", "shaders/sprite.frag", nullptr, "sprite");
ResourceManager::LoadShader("shaders/particle.vs", "shaders/particle.frag", nullptr, "particle");
// Configure shaders
glm::mat4 projection = glm::ortho(0.0f, static_cast<GLfloat>(this->Width), static_cast<GLfloat>(this->Height), 0.0f, -1.0f, 1.0f);
ResourceManager::GetShader("sprite").Use().SetInteger("sprite", 0);
ResourceManager::GetShader("sprite").SetMatrix4("projection", projection);
ResourceManager::GetShader("particle").Use().SetInteger("sprite", 0);
ResourceManager::GetShader("particle").SetMatrix4("projection", projection);
// Load textures
ResourceManager::LoadTexture("textures/background.jpg", GL_FALSE, "background");
ResourceManager::LoadTexture("textures/awesomeface.png", GL_TRUE, "face");
ResourceManager::LoadTexture("textures/block.png", GL_FALSE, "block");
ResourceManager::LoadTexture("textures/block_solid.png", GL_FALSE, "block_solid");
ResourceManager::LoadTexture("textures/paddle.png", GL_TRUE, "paddle");
ResourceManager::LoadTexture("textures/particle.png", GL_TRUE, "particle");
// Set render-specific controls
Renderer = new SpriteRenderer(ResourceManager::GetShader("sprite"));
Particles = new ParticleGenerator(ResourceManager::GetShader("particle"), ResourceManager::GetTexture("particle"), 500);
// Load levels
GameLevel one; one.Load("levels/one.lvl", this->Width, this->Height * 0.5);
GameLevel two; two.Load("levels/two.lvl", this->Width, this->Height * 0.5);
GameLevel three; three.Load("levels/three.lvl", this->Width, this->Height * 0.5);
GameLevel four; four.Load("levels/four.lvl", this->Width, this->Height * 0.5);
this->Levels.push_back(one);
this->Levels.push_back(two);
this->Levels.push_back(three);
this->Levels.push_back(four);
this->Level = 0;
// Configure game objects
glm::vec2 playerPos = glm::vec2(this->Width / 2 - PLAYER_SIZE.x / 2, this->Height - PLAYER_SIZE.y);
Player = new GameObject(playerPos, PLAYER_SIZE, ResourceManager::GetTexture("paddle"));
glm::vec2 ballPos = playerPos + glm::vec2(PLAYER_SIZE.x / 2 - BALL_RADIUS, -BALL_RADIUS * 2);
Ball = new BallObject(ballPos, BALL_RADIUS, INITIAL_BALL_VELOCITY, ResourceManager::GetTexture("face"));
}
void Game::Update(GLfloat dt)
{
// Update objects
Ball->Move(dt, this->Width);
// Check for collisions
this->DoCollisions(dt);
// Update particles
Particles->Update(dt, *Ball, 2, glm::vec2(Ball->Radius / 2));
// Check loss condition
if (Ball->Position.y >= this->Height) // Did ball reach bottom edge?
{
this->ResetLevel();
this->ResetPlayer();
}
}
void Game::ProcessInput(GLfloat dt)
{
if (this->State == GAME_ACTIVE)
{
GLfloat velocity = PLAYER_VELOCITY * dt;
// Move playerboard
if (this->Keys[GLFW_KEY_A])
{
if (Player->Position.x >= 0)
{
Player->Position.x -= velocity;
if (Ball->Stuck)
Ball->Position.x -= velocity;
}
}
if (this->Keys[GLFW_KEY_D])
{
if (Player->Position.x <= this->Width - Player->Size.x)
{
Player->Position.x += velocity;
if (Ball->Stuck)
Ball->Position.x += velocity;
}
}
if (this->Keys[GLFW_KEY_SPACE])
Ball->Stuck = false;
}
}
void Game::Render()
{
if (this->State == GAME_ACTIVE)
{
// Draw background
Renderer->DrawSprite(ResourceManager::GetTexture("background"), glm::vec2(0, 0), glm::vec2(this->Width, this->Height), 0.0f);
// Draw level
this->Levels[this->Level].Draw(*Renderer);
// Draw player
Player->Draw(*Renderer);
// Draw particles
Particles->Draw();
// Draw ball
Ball->Draw(*Renderer);
}
}
void Game::ResetLevel()
{
if (this->Level == 0)this->Levels[0].Load("levels/one.lvl", this->Width, this->Height * 0.5f);
else if (this->Level == 1)
this->Levels[1].Load("levels/two.lvl", this->Width, this->Height * 0.5f);
else if (this->Level == 2)
this->Levels[2].Load("levels/three.lvl", this->Width, this->Height * 0.5f);
else if (this->Level == 3)
this->Levels[3].Load("levels/four.lvl", this->Width, this->Height * 0.5f);
}
void Game::ResetPlayer()
{
// Reset player/ball stats
Player->Size = PLAYER_SIZE;
Player->Position = glm::vec2(this->Width / 2 - PLAYER_SIZE.x / 2, this->Height - PLAYER_SIZE.y);
Ball->Reset(Player->Position + glm::vec2(PLAYER_SIZE.x / 2 - BALL_RADIUS, -(BALL_RADIUS * 2)), INITIAL_BALL_VELOCITY);
}
// Collision detection
GLboolean CheckCollision(GameObject &one, GameObject &two);
Collision CheckCollision(BallObject &one, GameObject &two);
Direction VectorDirection(glm::vec2 closest);
void Game::DoCollisions()
{
for (GameObject &box : this->Levels[this->Level].Bricks)
{
if (!box.Destroyed)
{
Collision collision = CheckCollision(*Ball, box);
if (std::get<0>(collision)) // If collision is true
{
// Destroy block if not solid
if (!box.IsSolid)
box.Destroyed = GL_TRUE;
// Collision resolution
Direction dir = std::get<1>(collision);
glm::vec2 diff_vector = std::get<2>(collision);
if (dir == LEFT || dir == RIGHT) // Horizontal collision
{
Ball->Velocity.x = -Ball->Velocity.x; // Reverse horizontal velocity
// Relocate
GLfloat penetration = Ball->Radius - std::abs(diff_vector.x);
if (dir == LEFT)
Ball->Position.x += penetration; // Move ball to right
else
Ball->Position.x -= penetration; // Move ball to left;
}
else // Vertical collision
{
Ball->Velocity.y = -Ball->Velocity.y; // Reverse vertical velocity
// Relocate
GLfloat penetration = Ball->Radius - std::abs(diff_vector.y);
if (dir == UP)
Ball->Position.y -= penetration; // Move ball bback up
else
Ball->Position.y += penetration; // Move ball back down
}
}
}
}
// Also check collisions for player pad (unless stuck)
Collision result = CheckCollision(*Ball, *Player);
if (!Ball->Stuck && std::get<0>(result))
{
// Check where it hit the board, and change velocity based on where it hit the board
GLfloat centerBoard = Player->Position.x + Player->Size.x / 2;
GLfloat distance = (Ball->Position.x + Ball->Radius) - centerBoard;
GLfloat percentage = distance / (Player->Size.x / 2);
// Then move accordingly
GLfloat strength = 2.0f;
glm::vec2 oldVelocity = Ball->Velocity;
Ball->Velocity.x = INITIAL_BALL_VELOCITY.x * percentage * strength;
//Ball->Velocity.y = -Ball->Velocity.y;
Ball->Velocity = glm::normalize(Ball->Velocity) * glm::length(oldVelocity); // Keep speed consistent over both axes (multiply by length of old velocity, so total strength is not changed)
// Fix sticky paddle
Ball->Velocity.y = -1 * abs(Ball->Velocity.y);
}
}
GLboolean CheckCollision(GameObject &one, GameObject &two) // AABB - AABB collision
{
// Collision x-axis?
bool collisionX = one.Position.x + one.Size.x >= two.Position.x &&
two.Position.x + two.Size.x >= one.Position.x;
// Collision y-axis?
bool collisionY = one.Position.y + one.Size.y >= two.Position.y &&
two.Position.y + two.Size.y >= one.Position.y;
// Collision only if on both axes
return collisionX && collisionY;
}
Collision CheckCollision(BallObject &one, GameObject &two) // AABB - Circle collision
{
// Get center point circle first
glm::vec2 center(one.Position + one.Radius);
// Calculate AABB info (center, half-extents)
glm::vec2 aabb_half_extents(two.Size.x / 2, two.Size.y / 2);
glm::vec2 aabb_center(two.Position.x + aabb_half_extents.x, two.Position.y + aabb_half_extents.y);
// Get difference vector between both centers
glm::vec2 difference = center - aabb_center;
glm::vec2 clamped = glm::clamp(difference, -aabb_half_extents, aabb_half_extents);
// Now that we know the the clamped values, add this to AABB_center and we get the value of box closest to circle
glm::vec2 closest = aabb_center + clamped;
// Now retrieve vector between center circle and closest point AABB and check if length < radius
difference = closest - center;
if (glm::length(difference) < one.Radius) // not <= since in that case a collision also occurs when object one exactly touches object two, which they are at the end of each collision resolution stage.
return std::make_tuple(GL_TRUE, VectorDirection(difference), difference);
else
return std::make_tuple(GL_FALSE, UP, glm::vec2(0, 0));
}
// Calculates which direction a vector is facing (N,E,S or W)
Direction VectorDirection(glm::vec2 target)
{
glm::vec2 compass[] = {
glm::vec2(0.0f, 1.0f), // up
glm::vec2(1.0f, 0.0f), // right
glm::vec2(0.0f, -1.0f), // down
glm::vec2(-1.0f, 0.0f) // left
};
GLfloat max = 0.0f;
GLuint best_match = -1;
for (GLuint i = 0; i < 4; i++)
{
GLfloat dot_product = glm::dot(glm::normalize(target), compass[i]);
if (dot_product > max)
{
max = dot_product;
best_match = i;
}
}
return (Direction)best_match;
}
HI