95 lines
2.6 KiB
JavaScript
95 lines
2.6 KiB
JavaScript
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import Node, { addNodeClass } from '../core/Node.js';
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import { varyingProperty } from '../core/PropertyNode.js';
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import { instancedBufferAttribute, instancedDynamicBufferAttribute } from './BufferAttributeNode.js';
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import { normalLocal } from './NormalNode.js';
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import { positionLocal } from './PositionNode.js';
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import { nodeProxy, vec3, mat3, mat4 } from '../shadernode/ShaderNode.js';
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import { DynamicDrawUsage, InstancedInterleavedBuffer, InstancedBufferAttribute } from 'three';
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class InstanceNode extends Node {
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constructor( instanceMesh ) {
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super( 'void' );
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this.instanceMesh = instanceMesh;
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this.instanceMatrixNode = null;
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this.instanceColorNode = null;
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}
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setup( /*builder*/ ) {
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let instanceMatrixNode = this.instanceMatrixNode;
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const instanceMesh = this.instanceMesh;
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if ( instanceMatrixNode === null ) {
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const instanceAttribute = instanceMesh.instanceMatrix;
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const buffer = new InstancedInterleavedBuffer( instanceAttribute.array, 16, 1 );
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const bufferFn = instanceAttribute.usage === DynamicDrawUsage ? instancedDynamicBufferAttribute : instancedBufferAttribute;
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const instanceBuffers = [
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// F.Signature -> bufferAttribute( array, type, stride, offset )
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bufferFn( buffer, 'vec4', 16, 0 ),
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bufferFn( buffer, 'vec4', 16, 4 ),
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bufferFn( buffer, 'vec4', 16, 8 ),
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bufferFn( buffer, 'vec4', 16, 12 )
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];
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instanceMatrixNode = mat4( ...instanceBuffers );
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this.instanceMatrixNode = instanceMatrixNode;
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}
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const instanceColorAttribute = instanceMesh.instanceColor;
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if ( instanceColorAttribute && this.instanceColorNode === null ) {
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const buffer = new InstancedBufferAttribute( instanceColorAttribute.array, 3 );
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const bufferFn = instanceColorAttribute.usage === DynamicDrawUsage ? instancedDynamicBufferAttribute : instancedBufferAttribute;
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this.instanceColorNode = vec3( bufferFn( buffer, 'vec3', 3, 0 ) );
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}
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// POSITION
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const instancePosition = instanceMatrixNode.mul( positionLocal ).xyz;
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// NORMAL
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const m = mat3( instanceMatrixNode[ 0 ].xyz, instanceMatrixNode[ 1 ].xyz, instanceMatrixNode[ 2 ].xyz );
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const transformedNormal = normalLocal.div( vec3( m[ 0 ].dot( m[ 0 ] ), m[ 1 ].dot( m[ 1 ] ), m[ 2 ].dot( m[ 2 ] ) ) );
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const instanceNormal = m.mul( transformedNormal ).xyz;
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// ASSIGNS
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positionLocal.assign( instancePosition );
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normalLocal.assign( instanceNormal );
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// COLOR
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if ( this.instanceColorNode !== null ) {
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varyingProperty( 'vec3', 'vInstanceColor' ).assign( this.instanceColorNode );
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}
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}
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}
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export default InstanceNode;
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export const instance = nodeProxy( InstanceNode );
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addNodeClass( 'InstanceNode', InstanceNode );
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