first commit

tb/shader/EntityLink.fragsh

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+#version 120
+
+/*
+ Copyright (C) 2010-2017 Kristian Duske
+ 
+ This file is part of TrenchBroom.
+ 
+ TrenchBroom 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.
+ 
+ TrenchBroom 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 TrenchBroom. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+uniform float MaxDistance;
+uniform float Alpha;
+
+varying float distanceFromCamera;
+varying vec4 color;
+
+void main() {
+    float scale = (1.0 - clamp(distanceFromCamera / MaxDistance * 0.2 + 0.25, 0.0, 1.0));// * 0.35 + 0.65);
+    gl_FragColor = vec4(color.rgb, color.a * scale * Alpha);
+}