physics.h File Reference

#include "body.h"
#include "body_list.h"
#include "collision.h"
#include "gapi.h"
#include "position.h"
#include "system.h"
#include <math.h>

Go to the source code of this file.

Functions
void	gm_collision_resolve (gmCollision *collision)
	Resolves a collision between two bodies by applying appropriate forces and corrections.
void	gm_system_update_body_dt (gmSystem *sys, gmBody *body, double dt)
	Updates a single body in the system by integrating its position and velocity over time.
void	gm_body_update_dt (gmBody *body, double dt)
	Updates a single body by integrating its position and velocity over time.
void	gm_body_update (gmBody *body)
	Updates a single body by integrating its position and velocity over time.
gmCollision *	gm_collision_detect (gmBody *, gmBody *)
	Detects collision between two bodies.
void	gm_system_update_dt (gmSystem *sys, double unit, double dt)
	Updates the physics system with collision detection at specified time intervals.
int	gm_system_get_collision (gmCollision *collision, gmSystem *sys, gmBody *a, gmBody *b)
	Gets the collision information for two specific bodies in a system.
double	gm_collision_penetration_normals (gmBody *a, gmBody *b, double *normal_x, double *normal_y)
	Calculates the penetration depth and normal vector for a collision between two bodies.
double	gm_collision_penetration (gmBody *a, gmBody *b)
	Calculates the penetration depth for a collision between two bodies.

Variables
double	gm_system_frame_time = 0.001
	Default time step for physics system frame updates.

Function Documentation

gm_body_update()

void gm_body_update

(

gmBody *

body

)

Updates a single body by integrating its position and velocity over time.

Parameters

body	Pointer to the body to update.

gm_body_update_dt()

void gm_body_update_dt	(	gmBody *	body,
		double	dt )

Updates a single body by integrating its position and velocity over time.

Parameters

body	Pointer to the body to update.
dt	The time step for the update.

gm_collision_detect()

gmCollision * gm_collision_detect	(	gmBody *	a,
		gmBody *	b )

Detects collision between two bodies.

Parameters

a	Pointer to the first body.
b	Pointer to the second body.

Returns

A pointer to a gmCollision structure if collision occurs, NULL otherwise.

gm_collision_penetration()

double gm_collision_penetration	(	gmBody *	a,
		gmBody *	b )

Calculates the penetration depth for a collision between two bodies.

Parameters

a	Pointer to the first body.
b	Pointer to the second body.

Returns

The penetration depth between the bodies.

gm_collision_penetration_normals()

double gm_collision_penetration_normals	(	gmBody *	a,
		gmBody *	b,
		double *	normal_x,
		double *	normal_y )

Calculates the penetration depth and normal vector for a collision between two bodies.

Parameters

a	Pointer to the first body.
b	Pointer to the second body.
normal_x	Pointer to store the x component of the collision normal (can be NULL).
normal_y	Pointer to store the y component of the collision normal (can be NULL).

Returns

The penetration depth between the bodies.

gm_collision_resolve()

void gm_collision_resolve

(

gmCollision *

coll

)

Resolves a collision between two bodies by applying appropriate forces and corrections.

Resolves a collision by adjusting positions and velocities of colliding bodies.

Parameters

collision	Pointer to the collision to resolve.
coll	Pointer to the collision to resolve.

gm_system_get_collision()

int gm_system_get_collision	(	gmCollision *	collision,
		gmSystem *	sys,
		gmBody *	a,
		gmBody *	b )

Gets the collision information for two specific bodies in a system.

Parameters

collision	Pointer to the collision where to copy the result, or NULL.
sys	Pointer to the system to search in.
a	Pointer to the first body.
b	Pointer to the second body.

Returns

1 if it found a collision else 0.

gm_system_update_body_dt()

void gm_system_update_body_dt	(	gmSystem *	sys,
		gmBody *	body,
		double	dt )

Updates a single body in the system by integrating its position and velocity over time.

Parameters

sys	Pointer to the system containing the body (can be NULL).
body	Pointer to the body to update.
dt	The time step for the update.

gm_system_update_dt()

void gm_system_update_dt	(	gmSystem *	sys,
		double	unit,
		double	dt )

Updates the physics system with collision detection at specified time intervals.

Parameters

sys	Pointer to the system to update.
unit	The time unit for sub-step calculations.
dt	The total time step to simulate.

Variable Documentation

gm_system_frame_time

double gm_system_frame_time = 0.001

Default time step for physics system frame updates.