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

Create 2.5D realtime graphics and pixelart with WebGL and three.js

import { voBuffer, voIndex } from './constants.js';
import { createTypedArray } from './createTypedArray.js';
const makeAttributeGetter = (bufferName, instanceOffset, attrOffset) => {
    return function getAttribute() {
        const idx = this[voIndex] * instanceOffset + attrOffset;
        const buf = this[voBuffer].buffers.get(bufferName);
        return buf.typedArray[idx];
    };
};
const makeAttributeSetter = (bufferName, instanceOffset, attrOffset) => {
    return function setAttribute(value) {
        const idx = this[voIndex] * instanceOffset + attrOffset;
        const buf = this[voBuffer].buffers.get(bufferName);
        buf.typedArray[idx] = value;
    };
};
const makeAttributeValuesGetter = (bufferName, bufferItemSize, vertexCount, attrOffset, attrSize) => {
    return function getAttributeValues() {
        const idx = this[voIndex] * vertexCount * bufferItemSize + attrOffset;
        const buf = this[voBuffer].buffers.get(bufferName);
        const source = buf.typedArray;
        const target = createTypedArray(buf.dataType, vertexCount * attrSize);
        for (let i = 0; i < vertexCount; i++) {
            if (attrSize === 1) {
                target[i] = source[idx + i * bufferItemSize];
            }
            else {
                target.set(source.subarray(idx + i * bufferItemSize, idx + i * bufferItemSize + attrSize), i * attrSize);
            }
        }
        return target;
    };
};
const makeAttributeValueSetter = (bufferName, bufferItemSize, vertexCount, attrOffset, attrSize) => {
    return function setAttributeValues(...values) {
        const source = values.length === 1 && Array.isArray(values[0]) ? values[0] : values;
        const idx = this[voIndex] * vertexCount * bufferItemSize + attrOffset;
        const target = this[voBuffer].buffers.get(bufferName).typedArray;
        for (let i = 0; i < vertexCount; i++) {
            if (attrSize === 1) {
                target[idx + i * bufferItemSize] = source[i];
            }
            else {
                target.set(Array.prototype.slice.call(source, i * attrSize, i * attrSize + attrSize), idx + i * bufferItemSize);
            }
        }
    };
};
export function createVertexObjectPrototype(voBuffer) {
    const { descriptor } = voBuffer;
    const { methods } = descriptor;
    const entries = descriptor.attributeNames.flatMap((attrName) => {
        const attr = descriptor.getAttribute(attrName);
        const bufAttr = voBuffer.bufferAttributes.get(attrName);
        const buf = voBuffer.buffers.get(bufAttr.bufferName);
        const methods = [];
        if (descriptor.vertexCount === 1 && attr.size === 1) {
            methods.push([
                attrName,
                {
                    enumerable: true,
                    get: makeAttributeGetter(bufAttr.bufferName, buf.itemSize, bufAttr.offset),
                    set: makeAttributeSetter(bufAttr.bufferName, buf.itemSize, bufAttr.offset),
                },
            ]);
        }
        else {
            methods.push([
                attr.getterName,
                {
                    enumerable: true,
                    value: makeAttributeValuesGetter(bufAttr.bufferName, buf.itemSize, descriptor.vertexCount, bufAttr.offset, attr.size),
                },
            ]);
            methods.push([
                attr.setterName,
                {
                    enumerable: true,
                    value: makeAttributeValueSetter(bufAttr.bufferName, buf.itemSize, descriptor.vertexCount, bufAttr.offset, attr.size),
                },
            ]);
        }
        if (attr.hasComponents) {
            attr.components.forEach((component, componentIndex) => {
                for (let vertexIndex = 0; vertexIndex < descriptor.vertexCount; vertexIndex++) {
                    const instanceOffset = descriptor.vertexCount * buf.itemSize;
                    const attrOffset = vertexIndex * buf.itemSize + bufAttr.offset + componentIndex;
                    if (descriptor.vertexCount > 1 || component !== attr.name) {
                        methods.push([
                            `${component}${descriptor.vertexCount === 1 ? '' : vertexIndex}`,
                            {
                                enumerable: true,
                                get: makeAttributeGetter(bufAttr.bufferName, instanceOffset, attrOffset),
                                set: makeAttributeSetter(bufAttr.bufferName, instanceOffset, attrOffset),
                            },
                        ]);
                    }
                }
            });
        }
        return methods;
    });
    if (methods) {
        entries.push(...Object.entries(methods)
            .filter(([, val]) => typeof val === 'function')
            .map(([key, value]) => [key, { value }]));
    }
    const props = Object.fromEntries(entries);
    return Object.create(descriptor.basePrototype ?? Object.prototype, props);
}
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