// default.frag

#version 330 core
#define MAX_LIGHTS 16

in vec3 vFragPos;
in vec3 vNormal;
in vec2 vUv;
out vec4 outColor;

uniform sampler2D uTexture;
uniform vec4 uColor;

uniform vec3 light_positions[MAX_LIGHTS];
uniform vec3 light_colors[MAX_LIGHTS];
uniform float light_intensities[MAX_LIGHTS];
uniform int num_lights;

void main() {
    vec3 norm = normalize(vNormal);
    vec3 lighting = vec3(0.1);
    for (int i = 0; i < num_lights; ++i) {
        vec3 toLight = light_positions[i] - vFragPos;
        float dist = length(toLight);
        vec3 lightDir = normalize(toLight);
        float diff = max(dot(norm, lightDir), 0.0);
        float attenuation = light_intensities[i] / (dist * dist + 1.0);
        lighting += light_colors[i] * diff * attenuation;
    }
    vec4 tex = texture(uTexture, vUv);
    //outColor = vec4(lighting, 1.0);
    outColor = vec4((tex.rgb * uColor.rgb) * lighting, tex.a * uColor.a);
}