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/usr/share/glmark2/shaders/ideas-logo.vert is in glmark2-data 2014.03+git20150611.fa71af2d-0ubuntu4.

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uniform mat4 projection;
uniform mat4 modelview;
uniform mat3 normalMatrix;
varying vec3 vertex_normal;
varying vec4 vertex_position;
varying vec3 eye_direction;
attribute vec3 vertex;
attribute vec3 normal;

vec3 unitvec(vec4 v1, vec4 v2)
{
    if (v1.w == 0.0 && v2.w == 0.0)
        return vec3(v2 - v1);
    if (v1.w == 0.0)
        return vec3(-v1);
    if (v2.w == 0.0)
        return vec3(v2);
    return v2.xyz/v2.w - v1.xyz/v1.w;
}

void main()
{
    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
    gl_Position = projection * modelview * curVertex;
    vertex_normal = normalMatrix * normal;
    vertex_position = modelview * curVertex;
    eye_direction = normalize(unitvec(vertex_position, vec4(0.0, 0.0, 0.0, 1.0)));
}