[require]
GLSL >= 1.10

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

[fragment shader]

void scale(vec4 in_color, float fact, out vec4 out_color)
{
	fact = fact;

	out_color = fact * in_color;
}

void main(void)
{
	vec4 color = vec4(0.0, 1.0, 0.0, 0.0);
	vec4 out_color;

	scale(color, 1.0, out_color);

	gl_FragColor = out_color;
}

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