1 files changed, 108 insertions, 0 deletions
diff --git a/src/crossfade.c b/src/crossfade.c
new file mode 100644
index 0000000..296bee2
--- /dev/null
+++ b/src/crossfade.c
@@ -0,0 +1,108 @@
+/*
+ * 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;
+}
+