dumb_physics.h

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#ifndef __DUMB_PHYSICS__H
#define __DUMB_PHYSICS__H

#include "entity.h"

/** Defines the Preset Physics values */
typedef enum
{
        PHYSICS_NULL                    = 0,
        PHYSICS_BASE_FRICTION   = 1,    /**< An enum constant representing the physics base friction option */
        PHYSICS_BASE_SPEED_X    = 5,    /**< An enum constant representing the physics base speed in x direction */
        PHYSICS_BASE_SPEED_Y    = 10,   /**< An enum constant representing the physics base speed in y direction */
        PHYSICS_MAX_SPEED               = 16,   /**< An enum constant representing the physics maximum speed  */
        PHYSICS_MAX
}physics_laws_t;

//typedef struct physics_s physics_t;

//struct physics_s
//{
//      int dummy_var;
//};

/**
 * Executes physics.
 * RunTime O( n(n+1)/2 )
 * Applies velocity, acceleration, gravity, and friction.
 * Limits velocity, acceleration, and sets bounds.
 * 
 * @author      Anthony Rios
 * @date        3/20/2016
 */
void RunPhysics(); 

/**
 * Check collision between entities. (AABB)
 *
 * @param [in,out]      self    If non-null, the class instance that this method operates on.
 * @param [in,out]      other   If non-null, the other.
 *
 * @return      An int 1 if colliding, 0 if not.
 *
 * @author      Anthony Rios
 * @date        3/20/2016
 */
int CheckCollision(entity_t *self, entity_t *other);

/**
 * Executes the collision operation.
 * Place self farthest x or y away from other, vice versa.
 * And negative the velocity to half of orginal collision vel, for bounce back.
 *
 * @param [in,out]      self    If non-null, the class instance that this method operates on.
 * @param [in,out]      other   If non-null, the other.
 *
 * @author      Anthony Rios
 * @date        3/20/2016
 */
void DoCollision(entity_t *self, entity_t *other);

/**
 * Applies the speed limit to vector a, defined by physics max speed.
 *
 * @param [in,out]      a       If non-null, the vec2_t to process.
 *
 * @author      Anthony Rios
 * @date        3/29/2016
 */
void ApplySpeedLimit(vec2_t *a);

/**
 * Applies the bounds to specified ent, defined by the screen dimensions.
 *
 * @param [in,out]      ent     If non-null, the ent.
 *
 * @author      Anthony Rios
 * @date        3/29/2016
 */
void ApplyBounds(entity_t * ent);

/**
 * Applies the friction to vector a, for the nonzero values.
 * Uses Physics_base_friction for friction coefficient.
 *
 * @param [in,out]      a       If non-null, the vec2_t to process.
 *
 * @author      Anthony Rios
 * @date        3/29/2016
 */
void ApplyFriction(vec2_t *a);


#endif