From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Thu, 5 Jul 2018 19:13:29 +0000 (+0200)
Subject: Fix normalization in the Sobel calculation.
X-Git-Tag: 1.8.0~76^2~245
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=eb879cde156d29caedd25092362c168b45dc2c0a;p=nageru

Fix normalization in the Sobel calculation.
---

diff --git a/sobel.frag b/sobel.frag
index 9feab1e..c4dabd5 100644
--- a/sobel.frag
+++ b/sobel.frag
@@ -47,4 +47,8 @@ void main()
 
 	gradients.x = (top_right + 2.0f * right + bottom_right) - (top_left + 2.0f * left + bottom_left);
 	gradients.y = (top_left + 2.0 * top + top_right) - (bottom_left + 2.0f * bottom + bottom_right);
+
+	// Normalize so that we have a normalized unit of intensity levels per pixel.
+	gradients.x *= 0.125;
+	gradients.y *= 0.125;
 }