1 files changed, 117 insertions, 0 deletions
diff --git a/bullet.c b/bullet.c
new file mode 100644
index 0000000..7885862
--- /dev/null
+++ b/bullet.c
@@ -0,0 +1,117 @@
+#include "game.h"
+#include <time.h>
+
+static const float BULLET_SPEED = 600.0f;
+
+static void destroy_bullet(unsigned char index)
+{
+  struct Bullet *b =  game->bullets[index];
+  
+  free(b);
+  game->bullets[index] = NULL;
+
+  game->bullets_left ++;
+}
+
+static void bullet_on_collision(struct Entity *this, struct Entity *other)
+{
+  int i, j;
+  // check if it is the enemy player
+  // TODO: Ask if this is good practice
+  struct Bullet *b = (struct Bullet *)this - offsetof(struct Bullet, entity); 
+  
+  if((void *)b->owner == (void *)other)
+    return;
+
+  if(!this->collidable && !other->collidable)
+    return;
+  
+  for(i = 0; i < game->num_entities; i ++)
+    {
+      if(game->entities[i] == this)
+	{
+	  for(j = i; j < game->num_entities - 1; j ++)
+	    game->entities[j] = game->entities[j + 1];
+	  //game->entities[i] = NULL;
+	}
+    }
+  game->num_entities --;
+  destroy_bullet(b->index);
+}
+
+void shoot_bullet(struct Player *owner)
+{
+  int i, j;
+  float speed, angle;
+  struct Bullet *b;
+  struct Gun *g = &owner->guns[owner->current_gun];
+  
+  if(game->bullets_left < g->projectiles_per_shot
+     || !g->ready || !g->bullets || owner->reloading)
+    return;
+
+  for(i = 0; i < g->projectiles_per_shot; i ++)
+    {
+      b = malloc( sizeof(struct Bullet) );
+      b->owner = owner;
+      b->entity.on_collision = bullet_on_collision;
+      b->entity.collidable = false;
+      b->entity.use_src_rect = false;
+      b->entity.texture = game->bullet_texture;
+      b->entity.x = owner->entity.x;
+      b->entity.y = owner->entity.y + 10;
+      b->entity.w = BULLET_WIDTH;
+      b->entity.h = BULLET_WIDTH;
+      b->damage = g->damage;
+      b->entity.name = "bullet";
+      angle = g->angle * ((float)rand() / (float)RAND_MAX) - g->angle / 2.0f;
+      speed = (owner->entity.mirror ? -BULLET_SPEED : BULLET_SPEED);
+  
+      b->entity.dx = speed;
+      b->entity.dy = SDL_sinf(angle) * 100.0f;
+
+      for(j = 0; j < MAX_BULLETS; j ++)
+	{
+	  if(!game->bullets[j])
+	    {
+	      game->bullets[j] = b;
+	      b->index = j;
+	      break;
+	    }
+	}
+
+      game->bullets_left --;
+    }
+  
+  g->bullets --;
+  g->ready = false;
+  g->cooldown_elapsed = 0.0f;
+
+  Mix_PlayChannel(-1, g->sound_effect, 0);
+}
+
+void update_bullets(void)
+{
+  int i;
+  struct Bullet *b;
+  
+  for(i = 0; i < MAX_BULLETS; i ++)
+    {
+      b = game->bullets[i];
+      
+      if(b)
+	{
+	  b->entity.x += b->entity.dx * game->frame_time;
+	  b->entity.y += b->entity.dy * game->frame_time;
+
+	  if(b->entity.x > (float)game->width || b->entity.x < 0.0f
+	     || b->entity.y > (float)game->height || b->entity.y < 0.0f)
+	    {
+	      destroy_bullet(b->index);
+	      continue;
+	    }
+
+	  game->entities[game->num_entities ++] = &b->entity;
+	}
+    }
+}