[require]
GLSL >= 1.20

[vertex shader file]
glsl-mvp.vert

[fragment shader]
#version 120
void main()
{
   const vec3 signs = sign(vec3(0.0, -42.9, 55.7));
   const float one = float(signs.x == signs.y + signs.z);
   gl_FragColor = vec4(0.0, one, 0.0, one);
}

[test]
clear color 0.0 0.0 0.0 0.0
clear
ortho
draw rect 10 10 10 10
probe rgb 15 15 0.0 1.0 0.0