Collisions

src/game.cpp

@@ -16,6 +16,37 @@ const float BALL_RADIUS = 12.5f;
 
 BallObject* ball;
 
+// AABB with AABB collision detection
+bool CheckCollisions(GameObject& one, GameObject& two)
+{
+    // Collision on the X-Axis
+    bool CollisionX = one.Position.x + one.Size.x >= two.Position.x &&
+        two.Position.x + two.Size.x >= one.Position.x;
+    // Colision on the y-Axis
+    bool CollisionY = one.Position.y + one.Size.y >= two.Position.y &&
+        two.Position.y + two.Size.y >= one.Position.y;
+    
+    return CollisionX && CollisionY;
+}
+
+// AABB with circle collision detection
+bool CheckCollisions(BallObject& one, GameObject& two)
+{
+    // Calculate the closest point on two's border to the center point of one
+    glm::vec2 center (one.Position + one.Radius);
+    glm::vec2 aabb_half_extents(two.Size.x /2.0f, two.Size.y / 2.0f);
+    glm::vec2 aabb_center(two.Position.x + aabb_half_extents.x, two.Position.y + aabb_half_extents.y );
+
+    glm::vec2 difference = center - aabb_center;
+    glm::vec2 clamped = glm::clamp(difference, -aabb_half_extents, aabb_half_extents);
+    
+    glm::vec2 closest = aabb_center + clamped;
+
+    // Calculate the distance and check if it is less then two's radius
+    difference = closest - center;
+    return glm::length(difference) < one.Radius;
+}
+
 
 
 Game::~Game()
@@ -69,6 +100,24 @@ void Game::Init()
 }
 
 
+void Game::DoCollisions()
+{
+    for(GameObject& box: this->Levels[this->Level].Bricks)
+    {
+        if(!box.Destroyed)
+        {
+            if(CheckCollisions(*ball, box))
+            {
+                if(!box.IsSolid)
+                {
+                    box.Destroyed = true;
+                }
+            }
+        }
+    }
+}
+
+
 void Game::ProcessInput(float dt)
 {
     if(this->State == GAME_ACTIVE)
@@ -107,6 +156,7 @@ void Game::ProcessInput(float dt)
 void Game::Update(float dt)
 {
     ball->Move(dt, this->Width);
+    this->DoCollisions();
 }
 
 void Game::Render()

src/game.h

@@ -35,6 +35,7 @@ class Game {
         void ProcessInput(float dt);
         void Update(float dt);
         void Render();
+        void DoCollisions();
 };