first commit

tb/shader/Triangle.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 bool ApplyTinting;
+uniform vec4 TintColor;
+
+varying vec4 vertexColor;
+varying vec3 modelNormal;
+varying vec3 viewVector;
+
+void main() {
+    gl_FragColor = vertexColor;
+    
+    if (ApplyTinting) {
+        gl_FragColor = vec4(gl_FragColor.rgb * TintColor.rgb * TintColor.a, gl_FragColor.a);
+        gl_FragColor = clamp(2.0 * gl_FragColor, 0.0, 1.0);
+    }
+
+    // angular dimming ( can be controlled with dimStrength )
+    float dimStrength = 0.5;
+    float angleDim = dot(normalize(viewVector), normalize(modelNormal)) * dimStrength + (1.0 - dimStrength);
+    
+    gl_FragColor.rgb *= angleDim;
+}