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tb/shader/Compass.vertsh

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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 vec3 CameraPosition;
+uniform vec3 LightDirection;
+uniform vec4 LightDiffuse;
+uniform vec4 LightSpecular;
+uniform vec4 MaterialDiffuse;
+uniform vec4 MaterialAmbient;
+uniform vec4 MaterialSpecular;
+uniform float MaterialShininess;
+uniform vec4 GlobalAmbient;
+
+void main(void) {
+	gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex;
+    
+    vec3 normal = normalize(gl_NormalMatrix * gl_Normal);
+    float NdotL = max(dot(normal, LightDirection), 0.0); // cosine of normal and light direction
+
+    vec4 diffuse = NdotL * LightDiffuse * MaterialDiffuse;
+    vec4 ambient = GlobalAmbient * MaterialAmbient;
+
+    vec3 eyeVector = normalize(CameraPosition - gl_Vertex.xyz);
+    vec3 halfVector = normalize(eyeVector - LightDirection);
+    float NdotHV = max(-dot(normal, halfVector), 0.0);
+    vec4 specular = MaterialSpecular * LightSpecular * pow(NdotHV, MaterialShininess);
+
+	gl_FrontColor = vec4((diffuse + ambient + specular).xyz, 1.0);
+}