void ckb_start(ckb_runctx* context, int state){
if(state == 0){
// Stop animation
phase = -1.;
return;
}
// Start animation
phase = 0.;
ckb_key* keys = context->keys;
unsigned count = context->keycount;
// Randomize starting colors and pick a random target
newtarget(current, count);
// Over the course of the animation, the keys fade between the current pattern and the target pattern
newtarget(target, count);
// Set all keys to current
for(unsigned i = 0; i < count; i++){
ckb_key* key = keys + i;
if(fadein)
current[i].a = 0;
key->a = current[i].a;
key->r = current[i].r;
key->g = current[i].g;
key->b = current[i].b;
}
}
void ckb_start(ckb_runctx* context){
phase = 0.;
ckb_key* keys = context->keys;
unsigned count = context->keycount;
newtarget(current, count);
newtarget(target, count);
// Set all keys to current
for(unsigned i = 0; i < count; i++){
ckb_key* key = keys + i;
if(fadein)
current[i].a = 0;
key->a = current[i].a;
key->r = current[i].r;
key->g = current[i].g;
key->b = current[i].b;
}
}
void ckb_time(ckb_runctx* context, double delta){
if(phase < 0.)
return;
// Advance animation
phase += delta;
if(phase > 1.){
// If the animation is complete, pick a new target pattern and start again
phase -= 1.;
rgb* temp = target;
target = current;
current = temp;
newtarget(target, context->keycount);
}
}
int ckb_frame(ckb_runctx* context, double delta){
if(phase < 0.)
// Generate an initial state if it hasn't been done yet
ckb_start(context);
ckb_key* keys = context->keys;
unsigned count = context->keycount;
phase += delta;
if(phase >= 1.){
phase -= 1.;
rgb* temp = target;
target = current;
current = temp;
newtarget(target, count);
}
for(unsigned i = 0; i < count; i++){
ckb_key* key = keys + i;
key->a = round(current[i].a * (1. - phase) + target[i].a * phase);
key->r = round(current[i].r * (1. - phase) + target[i].r * phase);
key->g = round(current[i].g * (1. - phase) + target[i].g * phase);
key->b = round(current[i].b * (1. - phase) + target[i].b * phase);
}
return 0;
}
