node_modules/three/src/renderers/shaders/ShaderLib/background_frag.glsl.js

export default /* glsl */`
uniform sampler2D t2D;

varying vec2 vUv;

void main() {

	vec4 texColor = texture2D( t2D, vUv );

	gl_FragColor = mapTexelToLinear( texColor );

	#include <tonemapping_fragment>
	#include <encodings_fragment>

}
`;