dsys2
annotate src/dsys_impl.h @ 0:34d90cd9ef9b
starting a new demosystem
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 20 Aug 2011 07:48:16 +0300 |
| parents | |
| children | 1705e550bd91 |
| rev | line source |
|---|---|
| nuclear@0 | 1 #ifndef DSYS_IMPL_H_ |
| nuclear@0 | 2 #define DSYS_IMPL_H_ |
| nuclear@0 | 3 |
| nuclear@0 | 4 #include "dsys2.h" |
| nuclear@0 | 5 |
| nuclear@0 | 6 static float eval_step(struct dsys_event *ev, demotime_t t); |
| nuclear@0 | 7 static float eval_lerp(struct dsys_event *ev, demotime_t t); |
| nuclear@0 | 8 static float eval_sigmoid(struct dsys_event *ev, demotime_t t); |
| nuclear@0 | 9 |
| nuclear@0 | 10 |
| nuclear@0 | 11 struct dsys_demo { |
| nuclear@0 | 12 demotime_t srctime; |
| nuclear@0 | 13 |
| nuclear@0 | 14 struct dsys_event *ev; |
| nuclear@0 | 15 int num_ev; |
| nuclear@0 | 16 }; |
| nuclear@0 | 17 |
| nuclear@0 | 18 struct callback { |
| nuclear@0 | 19 void (*func)(struct dsys_event*, void*); |
| nuclear@0 | 20 void *cls; |
| nuclear@0 | 21 |
| nuclear@0 | 22 struct callback *next; |
| nuclear@0 | 23 }; |
| nuclear@0 | 24 |
| nuclear@0 | 25 |
| nuclear@0 | 26 struct dsys_event { |
| nuclear@0 | 27 enum dsys_evtype type; |
| nuclear@0 | 28 |
| nuclear@0 | 29 demotime_t t0, t1; |
| nuclear@0 | 30 float val; |
| nuclear@0 | 31 |
| nuclear@0 | 32 float (*eval_func)(struct dsys_event*); |
| nuclear@0 | 33 |
| nuclear@0 | 34 struct callback *cblist; |
| nuclear@0 | 35 }; |
| nuclear@0 | 36 |
| nuclear@0 | 37 |
| nuclear@0 | 38 static float eval_step(struct dsys_event *ev, demotime_t t) |
| nuclear@0 | 39 { |
| nuclear@0 | 40 return t >= ev->t1 ? 1.0 : 0.0; |
| nuclear@0 | 41 } |
| nuclear@0 | 42 |
| nuclear@0 | 43 static float eval_lerp(struct dsys_event *ev, demotime_t t) |
| nuclear@0 | 44 { |
| nuclear@0 | 45 return (t - ev->t0) / (ev->t1 - ev->t0); |
| nuclear@0 | 46 } |
| nuclear@0 | 47 |
| nuclear@0 | 48 static float eval_sigmoid(struct dsys_event *ev, demotime_t t) |
| nuclear@0 | 49 { |
| nuclear@0 | 50 t = eval_lerp(ev, t); |
| nuclear@0 | 51 return 1.0 - (cos(t * M_PI) * 0.5 + 0.5); |
| nuclear@0 | 52 } |
| nuclear@0 | 53 |
| nuclear@0 | 54 #endif /* DSYS_IMPL_H_ */ |