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/*
** Copyright (c) 2012 The Khronos Group Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and/or associated documentation files (the
** "Materials"), to deal in the Materials without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Materials, and to
** permit persons to whom the Materials are furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be included
** in all copies or substantial portions of the Materials.
**
** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
*/
attribute vec4 gtf_Vertex;
attribute vec3 gtf_Normal;
attribute mat4 myAttrib4m;
uniform mat3 gtf_NormalMatrix;
varying float lightIntensity;
varying vec3 Position;
uniform vec3 LightPosition;
uniform mat4 gtf_ModelViewMatrix;
uniform mat4 gtf_ModelViewProjectionMatrix;
const float specularContribution = 0.7;
const float diffuseContribution = (1.0 - specularContribution);
void main(void) {
vec4 pos = gtf_ModelViewMatrix * gtf_Vertex;
Position = vec3(gtf_Vertex);
vec3 tnorm = normalize(gtf_NormalMatrix * gtf_Normal);
vec3 lightVec = normalize(LightPosition - vec3(pos));
vec3 reflectVec = reflect(lightVec, tnorm);
vec3 viewVec = normalize(vec3(pos));
float f = myAttrib4m[0][0];
float spec = clamp(dot(reflectVec, viewVec), f, 1.0);
//float spec = clamp(dot(reflectVec, viewVec), myAttribute1, myAttribute2);
spec = spec * spec;
spec = spec * spec;
spec = spec * spec;
spec = spec * spec;
lightIntensity = diffuseContribution * dot(lightVec, tnorm) +
specularContribution * spec;
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
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