@spearwolf/twopoint5d/lib/vertex-objects/initializeInstancedAttributes.js

a library to create 2.5d realtime graphics and pixelart with three.js

import { BufferGeometry, InstancedBufferAttribute, InstancedInterleavedBuffer, InterleavedBufferAttribute } from 'three';
import { toDrawUsage } from './toDrawUsage.js';
export function initializeInstancedAttributes(geometry, pool, buffers, bufferSerials) {
    const { descriptor } = pool;
    const meshPerAttribute = descriptor.meshCount;
    for (const buffer of pool.buffer.buffers.values()) {
        const attributes = pool.buffer.bufferNameAttributes.get(buffer.bufferName);
        if (attributes.length > 1) {
            const interleavedBuffer = new InstancedInterleavedBuffer(buffer.typedArray, buffer.itemSize, meshPerAttribute);
            interleavedBuffer.setUsage(toDrawUsage(buffer.usageType));
            buffers.set(buffer.bufferName, interleavedBuffer);
            bufferSerials.set(buffer.bufferName, buffer.serial);
            for (const bufAttr of attributes) {
                const attrDesc = descriptor.attributes.get(bufAttr.attributeName);
                const attr = new InterleavedBufferAttribute(interleavedBuffer, attrDesc.size, bufAttr.offset, attrDesc.normalizedData);
                attr.name = bufAttr.attributeName;
                geometry.setAttribute(attrDesc.name, attr);
            }
        }
        else {
            const bufAttr = attributes[0];
            const attrDesc = descriptor.attributes.get(bufAttr.attributeName);
            const attr = new InstancedBufferAttribute(buffer.typedArray, buffer.itemSize, attrDesc.normalizedData, meshPerAttribute);
            attr.setUsage(toDrawUsage(buffer.usageType));
            attr.name = bufAttr.attributeName;
            buffers.set(buffer.bufferName, attr);
            bufferSerials.set(buffer.bufferName, buffer.serial);
            geometry.setAttribute(attrDesc.name, attr);
        }
    }
}
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