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/*

Copyright (c) 2019 The Khronos Group Inc.

Use of this source code is governed by an MIT-style license that can be

found in the LICENSE.txt file.

*/

attribute vec3 gtf_Normal;

attribute vec4 gtf_Vertex;

uniform mat3 gtf_NormalMatrix;

uniform mat4 gtf_ModelViewMatrix;

uniform mat4 gtf_ModelViewProjectionMatrix;

varying float lightIntensity;

varying vec3  Position;

uniform vec3  LightPosition;

uniform vec3  NotActiveOne;

attribute float myAttribute1;

attribute float myAttribute2;

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 spec = clamp(dot(reflectVec, viewVec), 0.0, 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;