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#version 330 core
in VS_OUT {
vec3 frag_pos;
vec3 normal;
vec2 tex_coords;
} fs_in;
out vec4 frag_color;
uniform sampler2D texture0;
uniform vec3 light_pos;
uniform vec3 view_pos;
uniform bool blinn;
void main(void)
{
vec3 light_dir = normalize(light_pos-fs_in.frag_pos);
vec3 view_dir = normalize(view_pos-fs_in.frag_pos);
vec3 normal = normalize(fs_in.normal);
vec3 texture_color = texture(texture0, fs_in.tex_coords).rgb;
float diff = max(dot(normal, light_dir), 0.0);
float spec = 0.0;
if (blinn) {
vec3 halfway_dir = normalize(light_dir+view_dir);
spec = pow(max(dot(normal, halfway_dir), 0.0), 16.0);
} else {
vec3 reflect_dir = reflect(-light_dir, normal);
spec = pow(max(dot(view_dir, reflect_dir), 0.0), 8.0);
}
vec3 ambient = 0.05*texture_color;
vec3 diffuse = diff*texture_color;
vec3 specular = vec3(0.3)*spec;
frag_color = vec4(ambient+diffuse+specular, 1.0);
}
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