Make the material shaders physically based

shaders/mat_normalmap.frag

@@ -48,6 +48,7 @@ void main()
 	vec3 fragnormal = normalize(f_tbn * normalize(normal.xyz));
 	float reflectivity = param[1].z * texture(normalmap, f_coord).a;
 	float specularity = (tex_color.r + tex_color.g + tex_color.b) * 0.5;
+	legacy_gloss();
 
 	fragcolor = apply_lights(fragcolor, fragnormal, tex_color.rgb, reflectivity, specularity, shadow_tone);