Fx.h File Reference

Motion maths and the screen shake: easing, integer sine, randomness. More...

#include <stdint.h>

Go to the source code of this file.

Namespaces
namespace	fx
	Effects: motion maths, the screen shake, and (chgame/Sizzle.h) particles, banners and floating texts.

Enumerations
enum	fx::Ease : uint8_t {   fx::LINEAR ,   fx::OUT_CUBIC ,   fx::OUT_BACK ,   fx::IN_OUT ,   fx::OUT_BOUNCE }
	Easing curves for ease(). More...

Functions
int	fx::easeCurve (const int16_t *curve, int t, int n)
	Ease through a curve table.
int	fx::ease (Ease e, int t, int n)
	Ease: progress through a curve.
int	fx::bounce (int t, int n)
	The OUT_BOUNCE curve.
int	fx::isin (int a)
	Integer sine.
int	fx::icos (int a)
	Integer cosine.
uint32_t	fx::rnd ()
	A random number for presentation (xorshift32).
int	fx::rndRange (int lo, int hi)
	A random number in a range, for presentation.
void	fx::reseed ()
	Restart rnd() from its fixed seed.
void	fx::shake (uint8_t frames, uint8_t amplitude)
	Start a screen shake.
bool	fx::shaking ()
	Whether a shake is running.
void	fx::applyShake (int y0, int y1, int fill=-1)
	Shake the finished framebuffer: call after drawing, before the flush.
void	fx::shakeTick ()
	Count the shake down one tick: once per logic tick.
void	fx::shakeStop ()
	Stop the shake at once.

Variables
const int16_t	fx::EASE_CUBIC [17]
	The curves' tables (17 points, 0..256), for easeCurve().

Detailed Description

Motion maths and the screen shake: easing, integer sine, randomness.

Integer maths only: soft-float trig once cost a demo on this chip 8.5 KB of flash and half its frame rate.

A game's own effects (its particle kinds, banners, floating texts) live in the same namespace in the game's code, built from these (see chgame/Sizzle.h).