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/usr/share/glmark2/shaders/light-basic-texgen.vert is in glmark2-data 2014.03+git20150611.fa71af2d-0ubuntu4.

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attribute vec3 position;
attribute vec3 normal;

uniform mat4 ModelViewProjectionMatrix;
uniform mat4 NormalMatrix;
uniform vec3 CenterPoint;

varying vec4 Color;
varying vec2 TextureCoord;

void main(void)
{
    // Transform the normal to eye coordinates
    vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));

    // The LightSourcePosition is actually its direction for directional light
    vec3 L = normalize(LightSourcePosition.xyz);

    // Multiply the diffuse value by the vertex color (which is fixed in this case)
    // to get the actual color that we will use to draw this vertex with
    float diffuse = max(dot(N, L), 0.0);
    Color = vec4(diffuse * MaterialDiffuse.rgb, MaterialDiffuse.a);

    // Compute the texture coordinate and as a varying
    vec3 vnorm = normalize(position - CenterPoint);
    TextureCoord = asin(vnorm.xy) / PI + 0.5;

    // Transform the position to clip coordinates
    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
}