first commit

tb/shader/MiniMapEdge.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 vec4 Color;
+
+uniform vec3 BoundsMin;
+uniform vec3 BoundsMax;
+
+varying vec4 vertexWorldPosition;
+
+void main() {
+    gl_FragColor = Color;
+    if (any(lessThan(vertexWorldPosition.xyz, BoundsMin)) ||
+        any(greaterThan(vertexWorldPosition.xyz, BoundsMax)))
+        gl_FragColor.a = 0.05;
+}