[require]
GLSL >= 1.10

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

[fragment shader]
vec4 func(inout vec3 a)
{
	return vec4(a, 0.0);
}

void main()
{
   vec3 green = vec3(0.0, 1.0, 0.0);

   gl_FragColor = func(green);
}

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