From 6969eb14314ab89a100394a5f6f327e53258cc95 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Fri, 14 Jun 2019 23:49:28 +0200
Subject: Move DMX universe number into fixture

---
 src/nanolight.c | 11 ++++++-----
 src/nanolight.h |  1 +
 src/scanout.c   | 10 +++++++++-
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/src/nanolight.c b/src/nanolight.c
index 46f6efc..9b3c699 100644
--- a/src/nanolight.c
+++ b/src/nanolight.c
@@ -238,7 +238,7 @@ static gboolean draw_sig(GtkWidget *widget, cairo_t *cr, struct nanolight *nl)
 
 
 static struct fixture *create_fixture(struct nanolight *nl, struct fixture_class *cls,
-                                      const char *label, int base_addr)
+                                      const char *label, int universe, int base_addr)
 {
 	struct fixture *fix;
 	int i;
@@ -253,6 +253,7 @@ static struct fixture *create_fixture(struct nanolight *nl, struct fixture_class
 
 	fix = &nl->fixtures[nl->n_fixtures++];
 	fix->label = strdup(label);
+	fix->universe = universe;
 	fix->base_addr = base_addr;
 	fix->cls = cls;
 	fix->attr_vals = calloc(cls->n_attrs, sizeof(int));
@@ -626,10 +627,10 @@ int main(int argc, char *argv[])
 	nl.sel_attr = ATT_TILT;
 	nl.dragging = 0;
 
-	create_fixture(&nl, &cls, "mh1", 1);
-	create_fixture(&nl, &cls, "mh2", 52);
-	create_fixture(&nl, &cls, "mh3", 103);
-	create_fixture(&nl, &cls, "mh4", 154);
+	create_fixture(&nl, &cls, "mh1", 0, 1);
+	create_fixture(&nl, &cls, "mh2", 0, 52);
+	create_fixture(&nl, &cls, "mh3", 0, 103);
+	create_fixture(&nl, &cls, "mh4", 0, 154);
 
 	/* Set up output */
 	g_timeout_add(100, scanout_cb, &nl);
diff --git a/src/nanolight.h b/src/nanolight.h
index 1e0a0fd..046ea38 100644
--- a/src/nanolight.h
+++ b/src/nanolight.h
@@ -58,6 +58,7 @@ struct fixture_class
 struct fixture
 {
 	char *label;
+	int universe;
 	int base_addr;
 	struct fixture_class *cls;
 	int *attr_vals;
diff --git a/src/scanout.c b/src/scanout.c
index 49c6b6b..a12094f 100644
--- a/src/scanout.c
+++ b/src/scanout.c
@@ -34,6 +34,7 @@ int scanout_all(struct nanolight *nl)
 	int i;
 	int dmx[512];
 	char str[8200];
+	signed int universe = -1;
 
 	/* Start from zero */
 	for ( i=0; i<512; i++ ) dmx[i] = 0;
@@ -45,6 +46,11 @@ int scanout_all(struct nanolight *nl)
 		for ( j=0; j<fix->cls->n_attrs; j++ ) {
 			/* Minus one to convert DMX address to indexing in 'dmx' array */
 			int pos = fix->base_addr + fix->cls->attrs[j].addr_offset - 1;
+			if ( universe < 0 ) universe = fix->universe;
+			if ( fix->universe != universe ) {
+				fprintf(stderr, "Sorry, only one universe for now!\n");
+				abort();
+			}
 			if ( fix->cls->attrs[j].props & ATTR_16BIT ) {
 				dmx[pos] = (fix->attr_vals[j] & 0xff00) >> 8;
 				dmx[pos+1] = fix->attr_vals[j] & 0xff;
@@ -54,8 +60,10 @@ int scanout_all(struct nanolight *nl)
 		}
 	}
 
+	if ( universe == -1 ) return 0;  /* Nothing to do! */
+
 	/* Loop over DMX channels and prepare request */
-	strcpy(str, "u=1&d=");
+	snprintf(str, 16, "u=%i&d=", universe);
 	for ( i=0; i<512; i++ ) {
 		char tmp[6];
 		snprintf(tmp, 5, "%i,", dmx[i]);
-- 
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