73 lines
2.8 KiB
TypeScript
73 lines
2.8 KiB
TypeScript
import Endian from '/endian';
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import {MIN_WIDTH, MIN_HEIGHT, PACKET_ID_HELLO, PACKET_ID_SEND_FRAME, PACKET_ID_KEY_DOWN} from '/constants';
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function concatU8Array(array1: Uint8Array, array2: Uint8Array) {
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const final_array = new Uint8Array(array1.length + array2.length);
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final_array.set(array1);
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final_array.set(array2, array1.length);
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return final_array;
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}
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export function sendHello(websocket: WebSocket, rom_array: Uint8Array, savestate_array: Uint8Array) {
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console.log('Sending hello.');
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const length_rom = BigInt(rom_array.length);
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const length_savestate = BigInt(savestate_array.length);
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const raw_data =
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concatU8Array(
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concatU8Array(
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concatU8Array(Endian.u64ToByteArrayBigEndian(length_rom), rom_array),
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Endian.u64ToByteArrayBigEndian(length_savestate)
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),
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savestate_array
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);
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sendPacket(websocket, PACKET_ID_HELLO, raw_data);
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}
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export function sendKeyDown(websocket: WebSocket, isDown: boolean, key: number) {
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console.log('Sending keyDown.');
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console.log(PACKET_ID_KEY_DOWN);
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const isDownArray = new Uint8Array(1);
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isDownArray[0] = isDown ? 1: 0;
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const rawData = concatU8Array(isDownArray, Endian.u32ToByteArrayBigEndian(key));
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console.log(rawData.length);
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sendPacket(websocket, PACKET_ID_KEY_DOWN, rawData);
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}
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export function sendPacket(websocket: WebSocket, id: bigint, raw_data: Uint8Array) {
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const packet_u8 = concatU8Array(
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concatU8Array(Endian.u64ToByteArrayBigEndian(id), Endian.u64ToByteArrayBigEndian(BigInt(raw_data.length))),
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raw_data
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);
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const packet_buffer = packet_u8.buffer;
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console.log('Sending packet');
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websocket.send(packet_buffer);
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}
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export function handleSendFrame(raw_data: Uint8Array, canvas: HTMLCanvasElement, ctx: CanvasRenderingContext2D, printingFrame: boolean, setPrintingFrame: (c: boolean) => void) {
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if (printingFrame) {
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return;
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}
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setPrintingFrame(true);
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let data: Uint8Array | null = raw_data;
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const stride = Endian.byteArrayToU32BigEndian(data.slice(0, 4));
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data = data.slice(4, data.length);
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const output_buffer_size = Endian.byteArrayToU64BigEndian(data.slice(0, 8));
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data = data.slice(8, data.length);
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const img_data = ctx.createImageData(MIN_WIDTH, MIN_HEIGHT);
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const img_data_u8 = new Uint8Array(img_data.data.buffer);
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for (let i = 0; i<data.length; i++) {
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if (i % 4 == 3) {
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img_data_u8[i] = 255;
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continue;
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}
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img_data_u8[i] = data[i];
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}
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data = null;
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createImageBitmap(img_data).then((bitmap) => drawBitmap(bitmap, canvas, ctx, printingFrame));
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}
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function drawBitmap(bitmap: ImageBitmap, canvas: HTMLCanvasElement, ctx: CanvasRenderingContext2D, printingFrame: boolean) {
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ctx.drawImage(bitmap, 0, 0, canvas.width, canvas.height);
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printingFrame = false;
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}
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