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#version 330 core
in VS_OUT {
vec3 position;
vec3 normal;
vec2 tex_coords;
} vs_out;
layout(location = 0) out vec4 frag_color;
layout(location = 1) out vec4 bright_color;
struct light_t {
vec3 position;
vec3 color;
};
uniform light_t lights[3];
uniform sampler2D diffuse_texture;
uniform vec3 view_pos;
const int light_count = 3;
void main(void)
{
vec3 color = texture(diffuse_texture, vs_out.tex_coords).rgb;
vec3 ambient = 0.01 * color;
vec3 lighting = vec3(0.0);
vec3 view_dir = normalize(view_pos - vs_out.position);
for (int i = 0; i < light_count; i++) {
vec3 light_dir = normalize(lights[i].position - vs_out.position);
float diff = max(dot(light_dir, vs_out.normal), 0.0);
vec3 result = lights[i].color * diff * color;
float distance = length(vs_out.position - lights[i].position);
result *= 1.0 / (distance * distance);
lighting += result;
}
vec3 result = ambient + lighting;
float brightness = dot(result, vec3(0.2126, 0.7152, 0.0722));
if (brightness > 1.0) {
bright_color = vec4(result, 1.0);
} else {
bright_color = vec4(0.0, 0.0, 0.0, 1.0);
}
frag_color = vec4(result, 1.0);
}
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