three.js/src/renderers/shaders/ShaderLib/meshbasic_frag.glsl

uniform vec3 diffuse;
uniform float opacity;

#ifndef FLAT_SHADED

	varying vec3 vNormal;

#endif

#include <common>
#include <color_pars_fragment>
#include <uv_pars_fragment>
#include <uv2_pars_fragment>
#include <map_pars_fragment>
#include <alphamap_pars_fragment>
#include <aomap_pars_fragment>
#include <envmap_pars_fragment>
#include <fog_pars_fragment>
#include <specularmap_pars_fragment>
#include <logdepthbuf_pars_fragment>

void main() {

	vec4 diffuseColor = vec4( diffuse, opacity );

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

	ReflectedLight reflectedLight;
	reflectedLight.directDiffuse = vec3( 0.0 );
	reflectedLight.directSpecular = vec3( 0.0 );
	reflectedLight.indirectDiffuse = diffuseColor.rgb;
	reflectedLight.indirectSpecular = vec3( 0.0 );

	#include <aomap_fragment>

	vec3 outgoingLight = reflectedLight.indirectDiffuse;

	#include <envmap_fragment>

	gl_FragColor = linearToOutputTexel( vec4( outgoingLight, diffuseColor.a ) );

	#include <fog_fragment>
	#include <premultiply_alpha_fragment>

}