Add missing shader file

src/opengl/vertex.glsl

+// =====================================================================
+// This file is part of SWE_CUDA (see file SWE_Block.cu for details).
+// 
+// Copyright (C) 2010,2011 Tobias Schnabel
+// 
+// SWE_CUDA is free software: you can redristribute 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.
+//
+// SWE_CUDA 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 SWE_CUDA.  If not, see <http://www.gnu.org/licenses/>.
+// =====================================================================
+
+varying vec3 N;
+varying vec3 V;
+varying vec4 ambient;
+
+/* Shading of water surfaces with fresnel effect */
+
+void main()
+{	
+	// Compute properties of the light source
+	ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;
+	ambient += gl_LightModel.ambient * gl_FrontMaterial.ambient;
+	
+	// Transform our normal into eye space
+	N = normalize(gl_NormalMatrix * gl_Normal);
+	
+	// Calculate vector from vertex to the eye, 
+	// which resides at (0,0,0)
+	V = -vec3(gl_ModelViewMatrix*gl_Vertex);
+	
+	// Compute vertex position via internal transform function
+	gl_Position = ftransform();
+} 
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