[require]
GLSL >= 4.50

[fragment shader]
#version 430

uniform float x[8];
in float data[8];

out vec4 c;

void main()
{
    int i = 0;
    bool after_first = false;
    float t = 3.14;

    while (true) {
	if (after_first)
	    i++;

	after_first = true;

	if (i > 8)
	    break;

	t += data[i] * x[i];
    }

    c = vec4(t);
}

[vertex shader]
#version 450

in vec4 a;
in vec4 b;
in vec4 piglit_vertex;

out float data[8];

void main()
{
    gl_Position = piglit_vertex;

    data[0] = a.x;
    data[1] = a.y;
    data[2] = a.z;
    data[3] = a.w;
    data[4] = b.x;
    data[5] = b.y;
    data[6] = b.z;
    data[7] = b.w;
}