<!-- NEW7 — TEST 7 · THE WOVEN CITY · part 361 -->
y in values
 *
 *
 * Methods of the top-level container (textures factorizations):
 *
 * .setValue( gl, name, value, textures )
 *
 * 		sets uniform with  name 'name' to 'value'
 *
 * .setOptional( gl, obj, prop )
 *
 * 		like .set for an optional property of the object
 *
 */


const emptyTexture = /*@__PURE__*/ new Texture();

const emptyShadowTexture = /*@__PURE__*/ new DepthTexture( 1, 1 );

const emptyArrayTexture = /*@__PURE__*/ new DataArrayTexture();
const empty3dTexture = /*@__PURE__*/ new Data3DTexture();
const emptyCubeTexture = /*@__PURE__*/ new CubeTexture();

// --- Utilities ---

// Array Caches (provide typed arrays for temporary by size)

const arrayCacheF32 = [];
const arrayCacheI32 = [];

// Float32Array caches used for uploading Matrix uniforms

const mat4array = new Float32Array( 16 );
const mat3array = new Float32Array( 9 );
const mat2array = new Float32Array( 4 );

// Flattening for arrays of vectors and matrices

function flatten( array, nBlocks, blockSize ) {

	const firstElem = array[ 0 ];

	if ( firstElem <= 0 || firstElem > 0 ) return array;
	// unoptimized: ! isNaN( firstElem )
	// see http://jacksondunstan.com/articles/983

	const n = nBlocks * blockSize;
	let r = arrayCacheF32[ n ];

	if ( r === undefined ) {

		r = new Float32Array( n );
		arrayCacheF32[ n ] = r;

	}

	if ( nBlocks !== 0 ) {

		firstElem.toArray( r, 0 );

		for ( let i = 1, offset = 0; i !== nBlocks; ++ i ) {

			offset += blockSize;
			array[ i ].toArray( r, offset );

		}

	}

	return r;

}

function arraysEqual( a, b ) {

	if ( a.length !== b.length ) return false;

	for ( let i = 0, l = a.length; i < l; i ++ ) {

		if ( a[ i ] !== b[ i ] ) return false;

	}

	return true;

}

function copyArray( a, b ) {

	for ( let i = 0, l = b.length; i < l; i ++ ) {

		a[ i ] = b[ i ];

	}

}

// Texture unit allocation

function allocTexUnits( textures, n ) {

	let r = arrayCacheI32[ n ];

	if ( r === undefined ) {

		r = new Int32Array( n );
		arrayCacheI32[ n ] = r;

	}

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

		r[ i ] = textures.allocateTextureUnit();

	}

	return r;

}

// --- Setters ---

// Note: Defining these methods externally, because they come in a bunch
// and this way their names minify.

// Single scalar

function setValueV1f( gl, v ) {

	const cache = this.cache;

	if ( cache[ 0 ] === v ) return;

	gl.uniform1f( this.addr, v );

	cache[ 0 ] = v;

}

// Single float vector (from flat array or THREE.VectorN)

function setValueV2f( gl, v ) {

	const cache = this.cache;

	if ( v.x !== undefined ) {

		if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y ) {

			gl.uniform2f( this.addr, v.x, v.y );

			cache[ 0 ] = v.x;
			cache[ 1 ] = v.y;

		}

	} else {

		if ( arraysEqual( cache, v ) ) return;

		gl.uniform2fv( this.addr, v );

		copyArray( cache, v );

	}

}

function setValueV3f( gl, v ) {

	const cache = this.cache;

	if ( v.x !== undefined ) {

		if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z ) {

			gl.uniform3f( this.addr, v.x, v.y, v.z );

			cache[ 0 ] = v.x;
			cache[ 1 ] = v.y;
			cache[ 2 ] = v.z;

		}

	} else if ( v.r !== undefined ) {

		if ( cache[ 0 ] !== v.r || cache[ 1 ] !== v.g || cache[ 2 ] !== v.b ) {

			gl.uniform3f( this.addr, v.r, v.g, v.b );

			cache[ 0 ] = v.r;
			cache[ 1 ] = v.g;
			cache[ 2 ] = v.b;

		}

	} else {

		if ( arraysEqual( cache, v ) ) return;

		gl.uniform3fv( this.addr, v );

		copyArray( cache, v );

	}

}

function setValueV4f( gl, v ) {

	const cache = this.cache;

	if ( v.x !== undefined ) {

		if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z || cache[ 3 ] !== v.w ) {

			gl.uniform4f( this.addr, v.x, v.y, v.z, v.w );

			cache[ 0 ] = v.x;
			cache[ 1 ] = v.y;
			cache[ 2 ] = v.z;
			cache[ 3 ] = v.w;

		}

	} else {

		if ( arraysEqual( cache, v ) ) return;

		gl.uniform4fv( this.addr, v );

		copyArray( cache, v );

	}

}

// Single matrix (from flat array or THREE.MatrixN)

function setValueM2( gl, v ) {

	const cache = this.cache;
	const elements = v.elements;

	if ( elements === undefined ) {

		if ( arraysEqual( cache, v ) ) return;

		gl.uniformMatrix2fv( this.addr, false, v );

		copyArray( cache, v );

	} else {

		if ( arraysEqual( cache, elements ) ) return;

		mat2array.set( elements );

		gl.uniformMatrix2fv( this.addr, false, mat2array );

		copyArray( cache, elements );

	}

}

function setValueM3( gl, v ) {

	const cache = this.cache;
	const elements = v.elements;

	if ( elements === undefined ) {

		if ( arraysEqual( cache, v ) ) return;

		gl.uniformMatrix3fv( this.addr, false, v );

		copyArray( cache, v );

	} else {

		if ( arraysEqual( cache, elements ) ) return;

		mat3array.set( elements );

		gl.uniformMatrix3fv( this.addr, false, mat3array );

		copyArray( cache, elements );

	}

}

function setValueM4( gl, v ) {

	const cache = this.cache;
	const elements = v.elements;

	if ( elements === undefined ) {

		if ( arraysEqual( cache, v ) ) return;