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camera.js
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camera.js
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"use strict";
const { EventEmitter } = require("events");
const Jimp = require("jimp");
class Camera extends EventEmitter {
/**
* These represent the possible buttons that can be sent to the server.
*/
static Buttons = {
NONE: 0,
FORWARD: 2,
BACKWARD: 4,
LEFT: 8,
RIGHT: 16,
JUMP: 32,
DUCK: 64,
SPRINT: 128,
USE: 256,
FIRE_PRIMARY: 1024,
FIRE_SECONDARY: 2048,
RELOAD: 8192,
FIRE_THIRD: 134217728,
}
/**
* These represent the possible control flags that can be sent to the server.
* For example, Static CCTV cameras will not support movement.
*/
static ControlFlags = {
NONE: 0,
MOVEMENT: 1,
MOUSE: 2,
SPRINT_AND_DUCK: 4,
FIRE: 8,
RELOAD: 16,
CROSSHAIR: 32,
}
/**
* @param rustplus An existing RustPlus instance
* @param identifier Camera Identifier, such as OILRIG1 (or custom name)
*
* Events emitted by the Camera class instance
* - subscribing: When we are subscribing to the Camera.
* - subscribed: When we are subscribed to the Camera.
* - unsubscribing: When we are unsubscribing from the Camera.
* - unsubscribed: When we are unsubscribed from the Camera.
* - render: When a camera frame has been rendered. A png image buffer will be provided.
*/
constructor(rustplus, identifier) {
super();
this.rustplus = rustplus;
this.identifier = identifier;
this.isSubscribed = false;
this.cameraRays = [];
this.cameraSubscribeInfo = null;
this.subscribeInterval = null;
// listen to camera message broadcasts
this.rustplus.on('message', async (message) => {
await this._onMessage(message);
});
// unsubscribe when rustplus is disconnected (to prevent hanging due to intervals still running)
this.rustplus.on('disconnected', async () => {
if(this.isSubscribed){
await this.unsubscribe();
}
});
}
async _onMessage(message) {
// do nothing if not subscribed
if(!this.isSubscribed){
return;
}
if(message.broadcast && message.broadcast.cameraRays){
await this._onCameraRays(message.broadcast.cameraRays);
}
}
async _onCameraRays(cameraRays) {
// do nothing if not subscribed
if(!this.isSubscribed){
return;
}
// add new camera rays to cache
this.cameraRays.push(cameraRays);
// wait until we have enough camera rays to render an image
if(this.cameraRays.length > 10){
// remove first oldest rayData
this.cameraRays.shift();
// render to png
const frame = await this._renderCameraFrame(this.cameraRays, this.cameraSubscribeInfo.width, this.cameraSubscribeInfo.height);
// fire callback
await this._onRender(frame);
}
}
async _onRender(image) {
// do nothing if not subscribed
if(!this.isSubscribed){
return;
}
this.emit('render', image);
}
/**
* Render a camera frame to a PNG image buffer
* @param frames the frame data to render. This will be an array of camera rays from the server.
* @param width the width of the frame
* @param height the height of the frame
*/
async _renderCameraFrame(frames, width, height) {
// First we populate the samplePositionBuffer with the positions of each sample
const samplePositionBuffer = new Int16Array(width * height * 2);
for (let w = 0, _ = 0; _ < height; _++)
for (let g = 0; g < width; g++) {
samplePositionBuffer[w] = g;
samplePositionBuffer[++w] = _;
w++;
}
for (let B = new IndexGenerator(1337), R = width * height - 1; R >= 1; R--) {
let C = 2 * R,
I = 2 * B.nextInt(R + 1),
P = samplePositionBuffer[C],
k = samplePositionBuffer[C + 1],
A = samplePositionBuffer[I],
F = samplePositionBuffer[I + 1];
samplePositionBuffer[I] = P;
samplePositionBuffer[I + 1] = k;
samplePositionBuffer[C] = A;
samplePositionBuffer[C + 1] = F;
}
// Create the output buffer
const output = new Array(width * height);
// Loop through each frame
for (let frame of frames) {
// Reset some look back and pointer variables
let sampleOffset = 2 * frame.sampleOffset;
let dataPointer = 0;
let rayLookback = new Array(64);
for (let r = 0; r < 64; r++) rayLookback[r] = [0, 0, 0];
const rayData = frame.rayData;
// Loop through the ray data
while (true) {
if (dataPointer >= rayData.length - 1)
break;
// Get the first byte and set some variables
let t, r, i, n = rayData[dataPointer++];
// Ray Decoding Logic
if (255 === n) {
let l = rayData[dataPointer++],
o = rayData[dataPointer++],
s = rayData[dataPointer++],
u = (3 * (((t = (l << 2) | (o >> 6)) / 128) | 0) + 5 * (((r = 63 & o) / 16) | 0) + 7 * (i = s)) & 63,
f = rayLookback[u];
f[0] = t;
f[1] = r;
f[2] = i;
} else {
let c = 192 & n;
if (0 === c) {
let h = 63 & n, y = rayLookback[h];
t = y[0];
r = y[1];
i = y[2];
} else if (64 === c) {
let p = 63 & n,
v = rayLookback[p],
b = v[0],
w = v[1],
_ = v[2],
g = rayData[dataPointer++];
t = b + ((g >> 3) - 15);
r = w + ((7 & g) - 3);
i = _;
} else if (128 === c) {
let R = 63 & n,
C = rayLookback[R],
I = C[0],
P = C[1],
k = C[2];
t = I + (rayData[dataPointer++] - 127);
r = P;
i = k;
} else {
let A = rayData[dataPointer++],
F = rayData[dataPointer++],
D = (3 * (((t = (A << 2) | (F >> 6)) / 128) | 0) + 5 * (((r = 63 & F) / 16) | 0) + 7 * (i = 63 & n)) & 63,
E = rayLookback[D];
E[0] = t;
E[1] = r;
E[2] = i;
}
}
sampleOffset %= 2 * width * height;
const index = samplePositionBuffer[sampleOffset++] + samplePositionBuffer[sampleOffset++] * width;
output[index] = [t / 1023, r / 63, i];
}
}
const colours = [
[0.5, 0.5, 0.5], [0.8, 0.7, 0.7], [0.3, 0.7, 1], [0.6, 0.6, 0.6],
[0.7, 0.7, 0.7], [0.8, 0.6, 0.4], [1, 0.4, 0.4], [1, 0.1, 0.1],
];
const image = new Jimp(width, height);
for (let i = 0; i < output.length; i++) {
let ray = output[i];
if (!ray) {
continue;
}
let distance = ray[0]
let alignment = ray[1]
let material = ray[2]
let target_colour;
if (distance === 1 && alignment === 0 && material === 0) {
target_colour = [208, 230, 252];
} else {
let colour = colours[material];
target_colour = [(alignment * colour[0] * 255), (alignment * colour[1] * 255), (alignment * colour[2] * 255)]
}
let x = i % width;
let y = height - 1 - Math.floor(i / width);
image.setPixelColor(Jimp.rgbaToInt(target_colour[0], target_colour[1], target_colour[2], 255), x, y);
}
// return png buffer
return image.getBufferAsync(Jimp.MIME_PNG);
}
async _subscribe() {
// subscribe to camera
const response = await this.rustplus.sendRequestAsync({
cameraSubscribe: {
cameraId: this.identifier,
},
});
// update camera subscribe info
this.cameraSubscribeInfo = response.cameraSubscribeInfo;
this.isSubscribed = true;
}
async subscribe() {
this.emit('subscribing');
// subscribe to camera
await this._subscribe();
this.emit('subscribed');
// automatically resubscribe to the camera every 10 seconds
this.subscribeInterval = setInterval(async () => {
if(this.isSubscribed){
await this._subscribe();
}
}, 10_000);
}
async unsubscribe() {
this.emit('unsubscribing');
this.isSubscribed = false;
// stop automatically resubscribing
clearInterval(this.subscribeInterval);
// release memory
this.cameraRays = [];
this.cameraSubscribeInfo = null;
this.subscribeInterval = null;
// unsubscribe from camera on server (if connected)
if(this.rustplus.isConnected()){
try {
await this.rustplus.sendRequestAsync({
cameraUnsubscribe: {
},
});
} catch (error) {
// ignore errors unsubscribing from camera
}
}
this.emit('unsubscribed');
}
/**
* Sends camera movement to the server (mouse movement)
* @param buttons The buttons that are currently pressed
* @param x The x delta of the mouse movement
* @param y The y delta of the mouse movement
*/
async move(buttons, x, y) {
return await this.rustplus.sendRequestAsync({
cameraInput: {
buttons: buttons,
mouseDelta: {
x: x,
y: y,
}
},
});
}
/**
* Zooms a PTZ camera in by 1 level.
* PTZ cameras have 4 zoom levels.
* If the PTZ camera is already at max zoom (level 4), it zooms out as far as it can (level 1).
*/
async zoom() {
// press left mouse button to zoom in
await this.move(Camera.Buttons.FIRE_PRIMARY, 0, 0);
// release all mouse buttons
await this.move(Camera.Buttons.NONE, 0, 0);
}
/**
* Shoots a PTZ controllable Auto Turret.
*/
async shoot() {
// press left mouse button to shoot
await this.move(Camera.Buttons.FIRE_PRIMARY, 0, 0);
// release all mouse buttons
await this.move(Camera.Buttons.NONE, 0, 0);
}
/**
* Reloads a PTZ controllable Auto Turret
*/
async reload() {
// press reload button to reload turret
await this.move(Camera.Buttons.RELOAD, 0, 0);
// release all mouse buttons
await this.move(Camera.Buttons.NONE, 0, 0);
}
/**
* Check if camera is an auto turret
* @returns {boolean}
*/
isAutoTurret() {
const crosshairControlFlag = Camera.ControlFlags.CROSSHAIR;
return (this.cameraSubscribeInfo?.controlFlags & crosshairControlFlag) === crosshairControlFlag;
}
}
class IndexGenerator {
constructor(e) {
this.state = 0 | e;
this.nextState();
}
nextInt(e) {
let t = ((this.nextState() * (0 | e)) / 4294967295) | 0;
if (t < 0) t = e + t - 1;
return 0 | t;
}
nextState() {
let e = this.state, t = e;
e = ((e = ((e = (e ^ ((e << 13) | 0)) | 0) ^ ((e >>> 17) | 0)) | 0) ^ ((e << 5) | 0)) | 0;
this.state = e;
return t >= 0 ? t : 4294967295 + t - 1;
}
}
module.exports = Camera;