From 2cc20dd211db43e31620661e674b20a0cb687a9b Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Sun, 30 Jun 2019 18:40:30 +0200
Subject: Tweak scaling between floating point and DMX values

We want 0.5 (or 0.0 for -1..+1 attributes) to mean 128 exactly
---
 src/scanout.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/scanout.c b/src/scanout.c
index 8a8b2d0..57a03da 100644
--- a/src/scanout.c
+++ b/src/scanout.c
@@ -34,11 +34,14 @@ static void set_val(int *dmx, int base_addr, int attr_offset, float value, int s
 	int pos = base_addr + attr_offset - 1;
 
 	if ( sixteenbit ) {
-		int val = value * 65535;
+		int val = value * 65536;
+		if ( val >= 65536 ) val = 65535;
 		dmx[pos] = (val & 0xff00) >> 8;
 		dmx[pos+1] = val & 0xff;
 	} else {
-		dmx[pos] = value * 255;
+		int val = value * 255;
+		if ( val >= 255 ) val = 255;
+		dmx[pos] = value * 256;
 	}
 }
 
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