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56 lines
1.6 KiB
56 lines
1.6 KiB
import Node from '../core/Node.js';
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import ConstNode from '../core/ConstNode.js';
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import UVNode from '../accessors/UVNode.js';
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import MathNode from '../math/MathNode.js';
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import OperatorNode from '../math/OperatorNode.js';
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import SplitNode from '../utils/SplitNode.js';
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import JoinNode from '../utils/JoinNode.js';
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class SpriteSheetUVNode extends Node {
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constructor( countNode, uvNode = new UVNode(), frameNode = new ConstNode( 0 ) ) {
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super( 'vec2' );
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this.countNode = countNode;
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this.uvNode = uvNode;
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this.frameNode = frameNode;
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}
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construct() {
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const { frameNode, uvNode, countNode } = this;
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const one = new ConstNode( 1 );
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const width = new SplitNode( countNode, 'x' );
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const height = new SplitNode( countNode, 'y' );
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const total = new OperatorNode( '*', width, height );
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const roundFrame = new MathNode( MathNode.FLOOR, new MathNode( MathNode.MOD, frameNode, total ) );
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const frameNum = new OperatorNode( '+', roundFrame, one );
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const cell = new MathNode( MathNode.MOD, roundFrame, width );
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const row = new MathNode( MathNode.CEIL, new OperatorNode( '/', frameNum, width ) );
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const rowInv = new OperatorNode( '-', height, row );
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const scale = new OperatorNode( '/', one, countNode );
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const uvFrameOffset = new JoinNode( [
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new OperatorNode( '*', cell, new SplitNode( scale, 'x' ) ),
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new OperatorNode( '*', rowInv, new SplitNode( scale, 'y' ) )
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] );
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const uvScale = new OperatorNode( '*', uvNode, scale );
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const uvFrame = new OperatorNode( '+', uvScale, uvFrameOffset );
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return uvFrame;
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}
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}
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export default SpriteSheetUVNode;
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