#version 150

precision highp float;

in  vec4 ex_Color;
in  vec2 UV;

out vec4 out_Color;

uniform vec4 ambient;
uniform vec4 diffuse;
uniform vec4 specular;
uniform float shininess;
uniform bool monoMode = true;

uniform sampler2D texUnit0;
uniform sampler2D texUnit1;
uniform sampler2D texUnit2;
uniform sampler2D texUnit3;

void main(void)
{
    vec4 tc0 = texture(texUnit0,UV);
	vec4 tc1 = texture(texUnit1,UV);

	if (monoMode) {
		if(tc0.r > 0)
			out_Color = diffuse * vec4(1.0, 1.0, 1.0, tc0.r);
		else
			out_Color = ambient;
	}
	else {
		if (tc0.a > 0)
			out_Color = diffuse * tc0;
		else
			out_Color = ambient;
	}
}