#version 330

in vec2 fragTexCoord;
in vec4 fragColor;

uniform sampler2D texture0;
uniform sampler2D textureNormal;

uniform vec3 lightDir;
uniform vec4 lightColor;
uniform vec4 ambientColor;
uniform vec3 falloff = vec3(0.01, 2.4, 20);

out vec4 finalColor;

void main() {
	float d = length(lightDir);
	vec3 n = normalize(texture(textureNormal, fragTexCoord).xyz);
	vec3 l = normalize(lightDir);
	
	vec3 diffuse = lightColor.rgb * lightColor.a * max(dot(n, l), 0.0);
	vec3 ambient = ambientColor.rgb * ambientColor.a;
	float attenuation = 1.0 / (falloff.x + falloff.y * d + falloff.z * d * d);
	vec3 intensity = ambient + diffuse * attenuation;

	vec3 final = diffuse.rgb * intensity;

	finalColor = vec4(final, texture(texture0, fragTexCoord).a * 0.93);
}