math/ease.h

#include <modkit/math/ease.h>39 functions · 1 enums · 1 typedefs · 1 macros

Easing functions and interpolation helpers.

Standard Robert Penner easing set (https://easings.net), plus scalar/vector lerp and remap helpers. All functions take a normalized time t in [0,1] and return an eased value (typically in [0,1], though back/elastic overshoot). Header-only, like math/mat4.h. Use directly:

Functions

mk_clampffunction

float mk_clampf(float v, float lo, float hi)

Clamp v to [lo,hi].

Parameter	Type	Description
v	float	Value for v.
lo	float	Value for lo.
hi	float	Value for hi.

Returns The resulting value.

mk_easefunction

float mk_ease(mk_ease_type type, float t)

Evaluate an easing function selected at runtime.

Parameter	Type	Description
type	mk_ease_type	Value for type.
t	float	Value for t.

Returns The resulting value.

mk_ease_back_infunction

float mk_ease_back_in(float t)

Perform the ease back in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_back_inoutfunction

float mk_ease_back_inout(float t)

Perform the ease back inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_back_outfunction

float mk_ease_back_out(float t)

Perform the ease back out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_bounce_infunction

float mk_ease_bounce_in(float t)

Perform the ease bounce in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_bounce_inoutfunction

float mk_ease_bounce_inout(float t)

Perform the ease bounce inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_bounce_outfunction

float mk_ease_bounce_out(float t)

Perform the ease bounce out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_circ_infunction

float mk_ease_circ_in(float t)

Perform the ease circ in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_circ_inoutfunction

float mk_ease_circ_inout(float t)

Perform the ease circ inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_circ_outfunction

float mk_ease_circ_out(float t)

Perform the ease circ out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_cubic_infunction

float mk_ease_cubic_in(float t)

Perform the ease cubic in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_cubic_inoutfunction

float mk_ease_cubic_inout(float t)

Perform the ease cubic inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_cubic_outfunction

float mk_ease_cubic_out(float t)

Perform the ease cubic out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_elastic_infunction

float mk_ease_elastic_in(float t)

Perform the ease elastic in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_elastic_inoutfunction

float mk_ease_elastic_inout(float t)

Perform the ease elastic inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_elastic_outfunction

float mk_ease_elastic_out(float t)

Perform the ease elastic out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_expo_infunction

float mk_ease_expo_in(float t)

Perform the ease expo in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_expo_inoutfunction

float mk_ease_expo_inout(float t)

Perform the ease expo inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_expo_outfunction

float mk_ease_expo_out(float t)

Perform the ease expo out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_linearfunction

float mk_ease_linear(float t)

Perform the ease linear operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quad_infunction

float mk_ease_quad_in(float t)

Perform the ease quad in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quad_inoutfunction

float mk_ease_quad_inout(float t)

Perform the ease quad inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quad_outfunction

float mk_ease_quad_out(float t)

Perform the ease quad out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quart_infunction

float mk_ease_quart_in(float t)

Perform the ease quart in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quart_inoutfunction

float mk_ease_quart_inout(float t)

Perform the ease quart inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quart_outfunction

float mk_ease_quart_out(float t)

Perform the ease quart out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quint_infunction

float mk_ease_quint_in(float t)

Perform the ease quint in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quint_inoutfunction

float mk_ease_quint_inout(float t)

Perform the ease quint inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_quint_outfunction

float mk_ease_quint_out(float t)

Perform the ease quint out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_sine_infunction

float mk_ease_sine_in(float t)

Perform the ease sine in operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_sine_inoutfunction

float mk_ease_sine_inout(float t)

Perform the ease sine inout operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_ease_sine_outfunction

float mk_ease_sine_out(float t)

Perform the ease sine out operation.

Parameter	Type	Description
t	float	Value for t.

Returns The resulting value.

mk_lerpfunction

float mk_lerp(float a, float b, float t)

Linear interpolation between a and b by t.

Parameter	Type	Description
a	float	Value for a.
b	float	Value for b.
t	float	Value for t.

Returns The resulting value.

mk_quat_slerpfunction

mk_quat mk_quat_slerp(mk_quat a, mk_quat b, float t)

Spherical lerp between unit quaternions (thin cglm wrap).

Parameter	Type	Description
a	mk_quat	Value for a.
b	mk_quat	Value for b.
t	float	Value for t.

Returns The resulting value.

mk_remapfunction

float mk_remap(float v, float in_lo, float in_hi, float out_lo, float out_hi)

Remap v from [in_lo,in_hi] onto [out_lo,out_hi].

Parameter	Type	Description
v	float	Value for v.
in_lo	float	Value for in lo.
in_hi	float	Value for in hi.
out_lo	float	Receives the lo.
out_hi	float	Receives the hi.

Returns The resulting value.

mk_unlerpfunction

float mk_unlerp(float a, float b, float v)

Inverse lerp: where v sits in [a,b] as a 0..1 fraction.

Parameter	Type	Description
a	float	Value for a.
b	float	Value for b.
v	float	Value for v.

Returns The resulting value.

mk_vec2_lerpfunction

mk_vec2 mk_vec2_lerp(mk_vec2 a, mk_vec2 b, float t)

Component-wise lerp of two vec2.

Parameter	Type	Description
a	mk_vec2	Value for a.
b	mk_vec2	Value for b.
t	float	Value for t.

Returns The resulting value.

mk_vec3_lerpfunction

mk_vec3 mk_vec3_lerp(mk_vec3 a, mk_vec3 b, float t)

Component-wise lerp of two vec3.

Parameter	Type	Description
a	mk_vec3	Value for a.
b	mk_vec3	Value for b.
t	float	Value for t.

Returns The resulting value.

Enums

mk_ease_typeenum

Values for ease type.

Value	Description
MK_EASE_LINEAR	Selects linear.
MK_EASE_QUAD_IN	Quadratic acceleration.
MK_EASE_QUAD_OUT	Quadratic deceleration.
MK_EASE_QUAD_INOUT	Quadratic acceleration then deceleration.
MK_EASE_CUBIC_IN	Cubic acceleration.
MK_EASE_CUBIC_OUT	Cubic deceleration.
MK_EASE_CUBIC_INOUT	Cubic acceleration then deceleration.
MK_EASE_QUART_IN	Quartic acceleration.
MK_EASE_QUART_OUT	Quartic deceleration.
MK_EASE_QUART_INOUT	Quartic acceleration then deceleration.
MK_EASE_QUINT_IN	Quintic acceleration.
MK_EASE_QUINT_OUT	Quintic deceleration.
MK_EASE_QUINT_INOUT	Quintic acceleration then deceleration.
MK_EASE_SINE_IN	Sinusoidal acceleration.
MK_EASE_SINE_OUT	Sinusoidal deceleration.
MK_EASE_SINE_INOUT	Sinusoidal acceleration then deceleration.
MK_EASE_EXPO_IN	Exponential acceleration.
MK_EASE_EXPO_OUT	Exponential deceleration.
MK_EASE_EXPO_INOUT	Exponential acceleration then deceleration.
MK_EASE_CIRC_IN	Circular acceleration.
MK_EASE_CIRC_OUT	Circular deceleration.
MK_EASE_CIRC_INOUT	Circular acceleration then deceleration.
MK_EASE_BACK_IN	Backtracking acceleration with overshoot.
MK_EASE_BACK_OUT	Backtracking deceleration with overshoot.
MK_EASE_BACK_INOUT	Backtracking acceleration and deceleration.
MK_EASE_ELASTIC_IN	Elastic acceleration with oscillation.
MK_EASE_ELASTIC_OUT	Elastic deceleration with oscillation.
MK_EASE_ELASTIC_INOUT	Elastic acceleration and deceleration.
MK_EASE_BOUNCE_IN	Bouncing acceleration.
MK_EASE_BOUNCE_OUT	Bouncing deceleration.
MK_EASE_BOUNCE_INOUT	Bouncing acceleration and deceleration.
MK_EASE_COUNT	Number of easing functions.

Typedefs

mk_ease_typetypedef

typedef enum mk_ease_type mk_ease_type

Values for ease type.

Macros

MK_PIdefine

MK_PI

Constant for pi.