build/postprocessing.esm.js
function integrateEffect(prefix, effect, shaderParts, blendModes, defines, uniforms, attributes) {

	const functionRegExp = /(?:\w+\s+(\w+)\([\w\s,]*\)\s*{[^}]+})/g;
	const varyingRegExp = /(?:varying\s+\w+\s+(\w*))/g;

	const blendMode = effect.blendMode;
	const shaders = new Map([
		["fragment", effect.fragmentShader],
		["vertex", effect.vertexShader]
	]);

	const mainImageExists = (shaders.get("fragment") !== undefined && shaders.get("fragment").indexOf("mainImage") >= 0);
	const mainUvExists = (shaders.get("fragment") !== undefined && shaders.get("fragment").indexOf("mainUv") >= 0);

	let varyings = [], names = [];
	let transformedUv = false;
	let readDepth = false;

	if(shaders.get("fragment") === undefined) {

		console.error("Missing fragment shader", effect);

	} else if(mainUvExists && (attributes & EffectAttribute.CONVOLUTION) !== 0) {

		console.error("Effects that transform UV coordinates are incompatible with convolution effects", effect);

	} else if(!mainImageExists && !mainUvExists) {

		console.error("The fragment shader contains neither a mainImage nor a mainUv function", effect);

	} else {

		if(mainUvExists) {

			shaderParts.set(Section.FRAGMENT_MAIN_UV, shaderParts.get(Section.FRAGMENT_MAIN_UV) +
				"\t" + prefix + "MainUv(UV);\n");

			transformedUv = true;

		}

		if(shaders.get("vertex") !== null && shaders.get("vertex").indexOf("mainSupport") >= 0) {

			shaderParts.set(Section.VERTEX_MAIN_SUPPORT, shaderParts.get(Section.VERTEX_MAIN_SUPPORT) +
				"\t" + prefix + "MainSupport();\n");

			varyings = varyings.concat(findSubstrings(varyingRegExp, shaders.get("vertex")));
			names = names.concat(varyings).concat(findSubstrings(functionRegExp, shaders.get("vertex")));

		}

		names = names.concat(findSubstrings(functionRegExp, shaders.get("fragment")))
			.concat(Array.from(effect.uniforms.keys()))
			.concat(Array.from(effect.defines.keys()));

		// Store prefixed uniforms and macros.
		effect.uniforms.forEach((value, key) => uniforms.set(prefix + key.charAt(0).toUpperCase() + key.slice(1), value));
		effect.defines.forEach((value, key) => defines.set(prefix + key.charAt(0).toUpperCase() + key.slice(1), value));

		// Prefix varyings, functions, uniforms and macros.
		prefixSubstrings(prefix, names, defines);
		prefixSubstrings(prefix, names, shaders);

		// Collect unique blend modes.
		blendModes.set(blendMode.blendFunction, blendMode);

		if(mainImageExists) {

			let string = prefix + "MainImage(color0, UV, ";

			// The effect may sample depth in a different shader.
			if((attributes & EffectAttribute.DEPTH) !== 0 && shaders.get("fragment").indexOf("depth") >= 0) {

				string += "depth, ";
				readDepth = true;

			}

			string += "color1);\n\t";

			// Include the blend opacity uniform of this effect.
			const blendOpacity = prefix + "BlendOpacity";
			uniforms.set(blendOpacity, blendMode.opacity);

			// Blend the result of this effect with the input color.
			string += "color0 = blend" + blendMode.blendFunction +
				"(color0, color1, " + blendOpacity + ");\n\n\t";

			shaderParts.set(Section.FRAGMENT_MAIN_IMAGE,
				shaderParts.get(Section.FRAGMENT_MAIN_IMAGE) + string);

			shaderParts.set(Section.FRAGMENT_HEAD, shaderParts.get(Section.FRAGMENT_HEAD) +
				"uniform float " + blendOpacity + ";\n\n");

		}

		// Include the modified code in the final shader.
		shaderParts.set(Section.FRAGMENT_HEAD, shaderParts.get(Section.FRAGMENT_HEAD) +
			shaders.get("fragment") + "\n");

		if(shaders.get("vertex") !== null) {

			shaderParts.set(Section.VERTEX_HEAD, shaderParts.get(Section.VERTEX_HEAD) +
				shaders.get("vertex") + "\n");

		}

	}

	return { varyings, transformedUv, readDepth };

}
function integrateEffect(prefix, effect, shaderParts, blendModes, defines, uniforms, attributes) {

	const functionRegExp = /(?:\w+\s+(\w+)\([\w\s,]*\)\s*{[^}]+})/g;
	const varyingRegExp = /(?:varying\s+\w+\s+(\w*))/g;

	const blendMode = effect.blendMode;
	const shaders = new Map([
		["fragment", effect.fragmentShader],
		["vertex", effect.vertexShader]
	]);

	const mainImageExists = (shaders.get("fragment") !== undefined && shaders.get("fragment").indexOf("mainImage") >= 0);
	const mainUvExists = (shaders.get("fragment") !== undefined && shaders.get("fragment").indexOf("mainUv") >= 0);

	let varyings = [], names = [];
	let transformedUv = false;
	let readDepth = false;

	if(shaders.get("fragment") === undefined) {

		console.error("Missing fragment shader", effect);

	} else if(mainUvExists && (attributes & EffectAttribute.CONVOLUTION) !== 0) {

		console.error("Effects that transform UV coordinates are incompatible with convolution effects", effect);

	} else if(!mainImageExists && !mainUvExists) {

		console.error("The fragment shader contains neither a mainImage nor a mainUv function", effect);

	} else {

		if(mainUvExists) {

			shaderParts.set(Section.FRAGMENT_MAIN_UV, shaderParts.get(Section.FRAGMENT_MAIN_UV) +
				"\t" + prefix + "MainUv(UV);\n");

			transformedUv = true;

		}

		if(shaders.get("vertex") !== null && shaders.get("vertex").indexOf("mainSupport") >= 0) {

			shaderParts.set(Section.VERTEX_MAIN_SUPPORT, shaderParts.get(Section.VERTEX_MAIN_SUPPORT) +
				"\t" + prefix + "MainSupport();\n");

			varyings = varyings.concat(findSubstrings(varyingRegExp, shaders.get("vertex")));
			names = names.concat(varyings).concat(findSubstrings(functionRegExp, shaders.get("vertex")));

		}

		names = names.concat(findSubstrings(functionRegExp, shaders.get("fragment")))
			.concat(Array.from(effect.uniforms.keys()))
			.concat(Array.from(effect.defines.keys()));

		// Store prefixed uniforms and macros.
		effect.uniforms.forEach((value, key) => uniforms.set(prefix + key.charAt(0).toUpperCase() + key.slice(1), value));
		effect.defines.forEach((value, key) => defines.set(prefix + key.charAt(0).toUpperCase() + key.slice(1), value));

		// Prefix varyings, functions, uniforms and macros.
		prefixSubstrings(prefix, names, defines);
		prefixSubstrings(prefix, names, shaders);

		// Collect unique blend modes.
		blendModes.set(blendMode.blendFunction, blendMode);

		if(mainImageExists) {

			let string = prefix + "MainImage(color0, UV, ";

			// The effect may sample depth in a different shader.
			if((attributes & EffectAttribute.DEPTH) !== 0 && shaders.get("fragment").indexOf("depth") >= 0) {

				string += "depth, ";
				readDepth = true;

			}

			string += "color1);\n\t";

			// Include the blend opacity uniform of this effect.
			const blendOpacity = prefix + "BlendOpacity";
			uniforms.set(blendOpacity, blendMode.opacity);

			// Blend the result of this effect with the input color.
			string += "color0 = blend" + blendMode.blendFunction +
				"(color0, color1, " + blendOpacity + ");\n\n\t";

			shaderParts.set(Section.FRAGMENT_MAIN_IMAGE,
				shaderParts.get(Section.FRAGMENT_MAIN_IMAGE) + string);

			shaderParts.set(Section.FRAGMENT_HEAD, shaderParts.get(Section.FRAGMENT_HEAD) +
				"uniform float " + blendOpacity + ";\n\n");

		}

		// Include the modified code in the final shader.
		shaderParts.set(Section.FRAGMENT_HEAD, shaderParts.get(Section.FRAGMENT_HEAD) +
			shaders.get("fragment") + "\n");

		if(shaders.get("vertex") !== null) {

			shaderParts.set(Section.VERTEX_HEAD, shaderParts.get(Section.VERTEX_HEAD) +
				shaders.get("vertex") + "\n");

		}

	}

	return { varyings, transformedUv, readDepth };

}
Integrates the given effect.

@private
@param {String} prefix - A prefix.
@param {Effect} effect - An effect.
@param {Map<String, String>} shaderParts - The shader parts.
@param {Map<BlendFunction, BlendMode>} blendModes - The blend modes.
@param {Map<String, String>} defines - The macro definitions.
@param {Map<String, Uniform>} uniforms - The uniforms.
@param {EffectAttribute} attributes - The global, collective attributes.
@return {Object} The results.
@property {String[]} varyings - The varyings used by the given effect.
@property {Boolean} transformedUv - Indicates whether the effect transforms UV coordinates in the fragment shader.
@property {Boolean} readDepth - Indicates whether the effect actually uses depth in the fragment shader.