X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Feffects%2Fcolorcurve.cpp;h=9e242d1984007c2c5ea8565f3533630f323f8065;hp=130fa8df2a45f6b7be2fe711186273a8da26a5b1;hb=55e3f2d494d939280a4ea48676fd17ca2342b457;hpb=18449fc11c620be7b3115f28a5edfb57eb5985ef

diff --git a/source/effects/colorcurve.cpp b/source/effects/colorcurve.cpp
index 130fa8df..9e242d19 100644
--- a/source/effects/colorcurve.cpp
+++ b/source/effects/colorcurve.cpp
@@ -34,6 +34,7 @@ void ColorCurve::set_brightness_response(float b)
 {
 	if(b<=0 || b>1)
 		throw invalid_argument("ColorCurve::set_brightness_response");
+	// Calculate an offset value to obtain a derivative of 1 at zero intensity.
 	float t = (b<1 ? pow(b, 1/(1-b)) : 0.0f);
 	shdata.uniform("brightness_response", b, t, pow(t, b));
 }