uniform vec3 diffuse;
uniform float opacity;

#include common
#include color_pars_fragment
#include map_pars_fragment
#include alphamap_pars_fragment
#include lightmap_pars_fragment
#include envmap_pars_fragment
#include fog_pars_fragment
#include shadowmap_pars_fragment
#include specularmap_pars_fragment
#include logdepthbuf_pars_fragment

void main() {
  vec3 outgoingLight = vec3( 0.0 );  // outgoing light does not have an alpha, the surface does
  vec4 diffuseColor = vec4( diffuse, opacity );

  #include logdepthbuf_fragment
  #include map_fragment
  #include color_fragment
  #include alphamap_fragment
  #include alphatest_fragment
  #include specularmap_fragment

  outgoingLight = diffuseColor.rgb; // simple shader

  #include lightmap_fragment    // TODO: Light map on an otherwise unlit surface doesn't make sense.
  #include envmap_fragment
  #include shadowmap_fragment    // TODO: Shadows on an otherwise unlit surface doesn't make sense.

  #include linear_to_gamma_fragment

  #include fog_fragment

  fragColor = vec4( outgoingLight, diffuseColor.a );  // TODO, this should be pre-multiplied to allow for bright highlights on very transparent objects
}