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/*
* crossfade.c
*
* Copyright © 2019 Thomas White <taw@bitwiz.me.uk>
*
* This file is part of NanoLight.
*
* NanoLight is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <glib.h>
#include "lightctx.h"
static void fade(float start, float target, float frac, float *result)
{
float val = start + (target - start)*frac;
/* HTP merge */
if ( val > *result ) *result = val;
}
void calculate_fades(struct lightctx *nl)
{
int i;
float now = g_get_monotonic_time()/1e6; /* seconds */
for ( i=0; i<nl->n_fades; i++ ) {
int j;
struct fade *f = &nl->fades[i];
float st = f->start_time/1e6;
float frac;
if ( !f->active ) continue;
frac = ((now-st)-f->delay)/f->fade;
if ( frac > 1.0 ) {
frac = 1.0;
f->active = 0;
}
if ( frac < 0.0 ) frac = 0.0;
for ( j=0; i<f->n_fixtures; i++ ) {
struct fade_fix *fix = &f->fixtures[j];
if ( fix->attrs & INTENSITY ) {
fade(fix->start.intensity, fix->target.intensity, frac, &fix->fix->v.intensity);
}
if ( fix->attrs & COLOUR ) {
fade(fix->start.cyan, fix->target.cyan, frac, &fix->fix->v.cyan);
fade(fix->start.magenta, fix->target.magenta, frac, &fix->fix->v.magenta);
fade(fix->start.yellow, fix->target.yellow, frac, &fix->fix->v.yellow);
fade(fix->start.red, fix->target.red, frac, &fix->fix->v.red);
fade(fix->start.green, fix->target.green, frac, &fix->fix->v.green);
fade(fix->start.blue, fix->target.blue, frac, &fix->fix->v.blue);
}
if ( fix->attrs & PANTILT ) {
fade(fix->start.pan, fix->target.pan, frac, &fix->fix->v.pan);
fade(fix->start.tilt, fix->target.tilt, frac, &fix->fix->v.tilt);
}
}
}
}
void test_fade(struct lightctx *nl)
{
struct fade *f;
nl->fades = malloc(sizeof(struct fade));
f = &nl->fades[0];
f->fixtures = malloc(64*sizeof(struct fade_fix));
f->n_fixtures = 0;
f->fixtures[0].fix = &nl->fixtures[0];
f->fixtures[0].attrs = INTENSITY;
f->fixtures[0].target.intensity = 1.0;
f->n_fixtures = 1;
f->fade = 1.0;
f->delay = 1.0;
/* Start the fade */
f->fixtures[0].start = nl->fixtures[0].v;
f->start_time = g_get_monotonic_time();
f->active = 1;
nl->n_fades = 1;
}
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