cocos-engine/platforms/native/engine/jsb-scene.js

/****************************************************************************
 Copyright (c) 2021 Xiamen Yaji Software Co., Ltd.

 https://www.cocos.com/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated engine source code (the "Software"), a limited,
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 Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// __fastMQ__, __fastMQInfo__ are created in engine-native\cocos\bindings\manual\jsb_scene_manual_ext.cpp
const NULL_PTR = BigInt(0);
// @ts-check
const isLittleEndian = new Uint8Array(new Uint32Array([0x12345678]).buffer)[0] === 0x78;
let refMap = []; // prevent arguments from GC
const dataViews = [];

function getDataView (idx) {
    if (!dataViews[idx]) {
        dataViews[idx] = new DataView(__fastMQ__[idx]);
    }
    return dataViews[idx];
}

function beginTrans (fn, minBytes) {
    let dataView = getDataView(__fastMQInfo__[0]);
    let startPos = dataView.getUint32(0, isLittleEndian);
    let commands = dataView.getUint32(4, isLittleEndian);

    if (__fastMQInfo__[0] === 0 && commands === 0) {
        // reset all reference at begining
        refMap.length = 0;
    }

    if (dataView.byteLength <= startPos + minBytes + 12) {
        // allocation new ArrayBuffer, same size as __fastMQ__[0]
        if (!__fastMQ__[__fastMQInfo__[0] + 1]) {
            const buffer = new ArrayBuffer(dataView.byteLength);
            __fastMQ__.push(buffer);
            if (__fastMQInfo__[0] + 1 > 5) {
                console.warn(`Too many pending commands in __fastMQ__, forget to flush?`);
            }
        }
        __fastMQInfo__[0] += 1;
        dataView = getDataView(__fastMQInfo__[0]);
        startPos = 8;
        commands = 0;
    }

    let offset = 4;         // reserved for block total length
    dataView.setBigUint64(startPos + offset, fn, isLittleEndian);
    offset += 8;
    return {
        writeUint32: (value) => {
            dataView.setUint32(startPos + offset, value, isLittleEndian);
            offset += 4;
        },
        writeBigUint64: (value) => {
            dataView.setBigUint64(startPos + offset, value, isLittleEndian);
            offset += 8;
        },
        commit: () => {
            dataView.setUint32(startPos + 0, offset, isLittleEndian);   // fn length
            dataView.setUint32(0, startPos + offset, isLittleEndian);   // update offset
            dataView.setUint32(4, commands + 1, isLittleEndian);        // update cnt
            __fastMQInfo__[1] += 1;
        },
        writePointer (e) {
            if (e) {
                dataView.setBigUint64(startPos + offset, e.__native_ptr__, isLittleEndian);
                if (refMap.indexOf(e) < 0) {
                     refMap.push(e);
                }
            } else {
                dataView.setBigUint64(startPos + offset, NULL_PTR, isLittleEndian);
            }
            offset += 8;
        },
    };
}

// DrawBatch2D
const DRAW_BATCH_FN_TABLE = ns.DrawBatch2D.fnTable;
Object.defineProperty(ns.DrawBatch2D.prototype, 'visFlags', {
    set (v) {
        const trans = beginTrans(DRAW_BATCH_FN_TABLE.visFlags, 12);
        trans.writePointer(this);
        trans.writeUint32(v);
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

Object.defineProperty(ns.DrawBatch2D.prototype, 'descriptorSet', {
    set (v) {
        const trans = beginTrans(DRAW_BATCH_FN_TABLE.descriptorSet, 16);
        trans.writePointer(this);
        trans.writePointer(v);
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

Object.defineProperty(ns.DrawBatch2D.prototype, 'inputAssembler', {
    set (v) {
        const trans = beginTrans(DRAW_BATCH_FN_TABLE.inputAssembler, 16);
        trans.writePointer(this);
        trans.writePointer(v);
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

Object.defineProperty(ns.DrawBatch2D.prototype, 'passes', {
    set (passes) {
        if (!passes) return;

        const trans = beginTrans(DRAW_BATCH_FN_TABLE.passes, 8 + 4 + passes.length * 8);
        trans.writePointer(this);
        trans.writeUint32(passes.length); // arg
        for (const p of passes) {
            trans.writePointer(p);
        }
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

Object.defineProperty(ns.DrawBatch2D.prototype, 'shaders', {
    set (shaders) {
        if (!shaders) return;
        const trans = beginTrans(DRAW_BATCH_FN_TABLE.shaders, 8 + 4 + shaders.length * 8);
        trans.writePointer(this);
        trans.writeUint32(shaders.length); // arg
        for (const p of shaders) {
            trans.writePointer(p);
        }
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

// Pass
const PASS_FN_TABLE = ns.Pass.fnTable;
Object.defineProperty(ns.Pass.prototype, 'blendState', {
    set (v) {
        const trans = beginTrans(PASS_FN_TABLE.blendState, 16);
        trans.writePointer(this);
        trans.writePointer(v);
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

Object.defineProperty(ns.Pass.prototype, 'depthStencilState', {
    set (v) {
        const trans = beginTrans(PASS_FN_TABLE.depthStencilState, 16);
        trans.writePointer(this);
        trans.writePointer(v);
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

Object.defineProperty(ns.Pass.prototype, 'rasterizerState', {
    set (v) {
        const trans = beginTrans(PASS_FN_TABLE.rasterizerState, 16);
        trans.writePointer(this);
        trans.writePointer(v);
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});

Object.defineProperty(ns.Pass.prototype, 'descriptorSet', {
    set (v) {
        const trans = beginTrans(PASS_FN_TABLE.descriptorSet, 16);
        trans.writePointer(this);
        trans.writePointer(v);
        trans.commit();
    },
    enumerable: true,
    configurable: true,
});