[require]
GLSL >= 1.20

[vertex shader]
void main()
{
	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}

[fragment shader]
void main()
{
    const vec3 v = vec3(7.0, 22.0, 20.0);
    const vec3 r = smoothstep(14.0, 22.0, v);
    gl_FragColor = vec4(r, 1.0);
}

[test]
draw rect -1 -1 2 2
probe all rgb 0.0 1.0 0.84375