[require]
GLSL >= 4.50

[vertex shader]
layout(location=0) in vec4 vertex;
out vec4 value;

void main()
{
	value = vertex;

        // causes problems on haswell!
        float mod = 10.0 - (0.01 * value.y) / 10.0;
        if (mod < 0.0) mod = 0.0;
        float speed = 0.01 + mod;

        value.y -= speed;
        if (value.y <= 0.0) value.y += 10.0;
}


[geometry shader]
layout(triangles) in;
layout(triangle_strip) out;
layout(max_vertices = 1) out;

in vec4 value[];
out vec4 pos;

out vec4 fc;

void main()
{
	pos = value[0];
	fc = value[0];
	EmitVertex();
	EndPrimitive();
}

[fragment shader]
in vec4 fc;
out vec4 piglit_fragcolor;

void main()
{
    piglit_fragcolor = fc;
}

[test]
clear
draw rect -1 -1 2 2
probe all rgba 0.0 0.0 0.0 0.0