<!-- NEW4 — TEST 4 · THE QUILT · part 365 -->
}

}

function getShaderErrors( gl, shader, type ) {

	const status = gl.getShaderParameter( shader, gl.COMPILE_STATUS );

	const shaderInfoLog = gl.getShaderInfoLog( shader ) || '';
	const errors = shaderInfoLog.trim();

	if ( status && errors === '' ) return '';

	const errorMatches = /ERROR: 0:(\d+)/.exec( errors );
	if ( errorMatches ) {

		// --enable-privileged-webgl-extension
		// log( '**' + type + '**', gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( shader ) );

		const errorLine = parseInt( errorMatches[ 1 ] );
		return type.toUpperCase() + '\n\n' + errors + '\n\n' + handleSource( gl.getShaderSource( shader ), errorLine );

	} else {

		return errors;

	}

}

function getTexelEncodingFunction( functionName, colorSpace ) {

	const components = getEncodingComponents( colorSpace );

	return [

		`vec4 ${functionName}( vec4 value ) {`,

		`	return ${components[ 1 ]}( vec4( value.rgb * ${components[ 0 ]}, value.a ) );`,

		'}',

	].join( '\n' );

}

const toneMappingFunctions = {
	[ LinearToneMapping ]: 'Linear',
	[ ReinhardToneMapping ]: 'Reinhard',
	[ CineonToneMapping ]: 'Cineon',
	[ ACESFilmicToneMapping ]: 'ACESFilmic',
	[ AgXToneMapping ]: 'AgX',
	[ NeutralToneMapping ]: 'Neutral',
	[ CustomToneMapping ]: 'Custom'
};

function getToneMappingFunction( functionName, toneMapping ) {

	const toneMappingName = toneMappingFunctions[ toneMapping ];

	if ( toneMappingName === undefined ) {

		warn( 'WebGLProgram: Unsupported toneMapping:', toneMapping );
		return 'vec3 ' + functionName + '( vec3 color ) { return LinearToneMapping( color ); }';

	}

	return 'vec3 ' + functionName + '( vec3 color ) { return ' + toneMappingName + 'ToneMapping( color ); }';

}

const _v0 = /*@__PURE__*/ new Vector3();

function getLuminanceFunction() {

	ColorManagement.getLuminanceCoefficients( _v0 );

	const r = _v0.x.toFixed( 4 );
	const g = _v0.y.toFixed( 4 );
	const b = _v0.z.toFixed( 4 );

	return [

		'float luminance( const in vec3 rgb ) {',

		`	const vec3 weights = vec3( ${ r }, ${ g }, ${ b } );`,

		'	return dot( weights, rgb );',

		'}'

	].join( '\n' );

}

function generateVertexExtensions( parameters ) {

	const chunks = [
		parameters.extensionClipCullDistance ? '#extension GL_ANGLE_clip_cull_distance : require' : '',
		parameters.extensionMultiDraw ? '#extension GL_ANGLE_multi_draw : require' : '',
	];

	return chunks.filter( filterEmptyLine ).join( '\n' );

}

function generateDefines( defines ) {

	const chunks = [];

	for ( const name in defines ) {

		const value = defines[ name ];

		if ( value === false ) continue;

		chunks.push( '#define ' + name + ' ' + value );

	}

	return chunks.join( '\n' );

}

function fetchAttributeLocations( gl, program ) {

	const attributes = {};

	const n = gl.getProgramParameter( program, gl.ACTIVE_ATTRIBUTES );

	for ( let i = 0; i < n; i ++ ) {

		const info = gl.getActiveAttrib( program, i );
		const name = info.name;

		let locationSize = 1;
		if ( info.type === gl.FLOAT_MAT2 ) locationSize = 2;
		if ( info.type === gl.FLOAT_MAT3 ) locationSize = 3;
		if ( info.type === gl.FLOAT_MAT4 ) locationSize = 4;

		// log( 'WebGLProgram: ACTIVE VERTEX ATTRIBUTE:', name, i );

		attributes[ name ] = {
			type: info.type,
			location: gl.getAttribLocation( program, name ),
			locationSize: locationSize
		};

	}

	return attributes;

}

function filterEmptyLine( string ) {

	return string !== '';

}

function replaceLightNums( string, parameters ) {

	const numSpotLightCoords = parameters.numSpotLightShadows + parameters.numSpotLightMaps - parameters.numSpotLightShadowsWithMaps;

	return string
		.replace( /NUM_SUN_LIGHTS/g, parameters.numSunLights )
		.replace( /NUM_DIR_LIGHTS/g, parameters.numDirLights )
		.replace( /NUM_SPOT_LIGHTS/g, parameters.numSpotLights )
		.replace( /NUM_SPOT_LIGHT_MAPS/g, parameters.numSpotLightMaps )
		.replace( /NUM_SPOT_LIGHT_COORDS/g, numSpotLightCoords )
		.replace( /NUM_RECT_AREA_LIGHTS/g, parameters.numRectAreaLights )
		.replace( /NUM_POINT_LIGHTS/g, parameters.numPointLights )
		.replace( /NUM_HEMI_LIGHTS/g, parameters.numHemiLights )
		.replace( /NUM_SUN_LIGHT_SHADOWS/g, parameters.numSunLightShadows )
		.replace( /NUM_DIR_LIGHT_SHADOWS/g, parameters.numDirLightShadows )
		.replace( /NUM_SPOT_LIGHT_SHADOWS_WITH_MAPS/g, parameters.numSpotLightShadowsWithMaps )
		.replace( /NUM_SPOT_LIGHT_SHADOWS/g, parameters.numSpotLightShadows )
		.replace( /NUM_POINT_LIGHT_SHADOWS/g, parameters.numPointLightShadows );

}

function replaceClippingPlaneNums( string, parameters ) {

	return string
		.replace( /NUM_CLIPPING_PLANES/g, parameters.numClippingPlanes )
		.replace( /UNION_CLIPPING_PLANES/g, ( parameters.numClippingPlanes - parameters.numClipIntersection ) );

}

// Resolve Includes

const includePattern = /^[ \t]*#include +<([\w\d./]+)>/gm;

function resolveIncludes( string ) {

	return string.replace( includePattern, includeReplacer );

}

const shaderChunkMap = new Map();

funct