colliders.h

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#pragma once
 
#include <SDL.h>
#include <stdbool.h>
 
#define MAX_COLLISIONS_PER_CHECK 20
#define MAX_COLLIDABLES 1024
 
// Collision layers as bitmasks for efficient checking
typedef enum {
    COLLISION_LAYER_NONE                = 0,        // 00000000
    COLLISION_LAYER_PLAYER              = 1 << 0,   // 00000001
    COLLISION_LAYER_ENVIRONMENT         = 1 << 1,   // 00000010
    COLLISION_LAYER_ENEMY               = 1 << 2,   // 00000100
    COLLISION_LAYER_TRIGGER             = 1 << 3,   // 00001000
    COLLISION_LAYER_ENEMY_PROJECTILE    = 1 << 4,   // 00010000
    COLLISION_LAYER_PLAYER_PROJECTILE   = 1 << 5,   // 00100000
} CollisionLayer;
 
typedef struct Collider {
    SDL_Rect hitbox; 
    CollisionLayer layer; 
    CollisionLayer collidesWith; 
    void* owner; 
    bool active; 
} Collider;
 
extern Collider* ColliderList[MAX_COLLIDABLES];
extern int ColliderCount;
 
typedef struct ColliderCheckResult {
    Collider* objects[MAX_COLLISIONS_PER_CHECK]; 
    int count; 
} ColliderCheckResult;
 
 
void Collider_Start();
 
void Collider_Register(Collider* collidable, void* owner);
 
bool Collider_Check(Collider* collidableObject, ColliderCheckResult* result);
 
void Collider_Reset(Collider* collider);