246 lines
8.0 KiB
JavaScript
246 lines
8.0 KiB
JavaScript
import React from 'react';
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import CenterElement from '/components/center-element';
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import FormSelectFiles from '/components/form-select-files';
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import CanvasGBAEmulator from '/components/canvas-gba-emulator';
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import Endian from '/endian';
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import {MIN_WIDTH, MIN_HEIGHT, PACKET_ID_HELLO, PACKET_ID_SEND_FRAME} from '/constants';
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function handleClickStartEmulationButton({e, inputRom, inputSaveState, setHiddenFormSelectFiles, canvas}) {
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const ctx = canvas.getContext('2d')
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e.preventDefault();
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if (inputRom.files.length == 0) {
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alert('There is no rom still');
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return;
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}
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if (inputSaveState.files.length == 0) {
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alert('There is no savestate still');
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return;
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}
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const rom_file = inputRom.files[0];
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const savestate_file = inputSaveState.files[0];
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rom_file.arrayBuffer().then((rom_buffer) => {
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savestate_file.arrayBuffer().then((savestate_buffer) => {
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const rom_array = new Uint8Array(rom_buffer);
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const savestate_array = new Uint8Array(savestate_buffer);
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const websocket = new WebSocket(`ws://localhost:3000/ws`);
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websocket.binaryType = 'arraybuffer';
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websocket.onclose = (message) => console.log('CLOSE', message);
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websocket.onopen = () => {
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setHiddenFormSelectFiles(c => false);
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console.log('Opened websocket.');
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sendHello(websocket, rom_array, savestate_array);
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};
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websocket.addEventListener('message', (event) => onWebSocketPacket(event, canvas, ctx));
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});
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});
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}
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function concatU8Array(array1, array2) {
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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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function u64ToByteArrayBigEndian(input_number) {
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const buffer = new ArrayBuffer(8);
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const buffer8 = new Uint8Array(buffer);
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const buffer64 = new BigUint64Array(buffer);
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buffer64[0] = input_number;
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if (Endian.isLittleEndian()) {
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buffer8.reverse();
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}
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return buffer8;
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}
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function sendPacket(websocket, id, raw_data) {
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const packet_u8 = concatU8Array(
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concatU8Array(u64ToByteArrayBigEndian(id), 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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function sendHello(websocket, rom_array, savestate_array) {
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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(u64ToByteArrayBigEndian(length_rom), rom_array),
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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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function onWebSocketPacket(event, canvas, ctx) {
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const buffer = event.data;
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let packet_u8 = new Uint8Array(buffer);
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const id = byteArrayToU64BigEndian(packet_u8.slice(0, 8));
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packet_u8 = packet_u8.slice(8, packet_u8.length);
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const size = byteArrayToU64BigEndian(packet_u8.slice(0, 8));
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const raw_data = packet_u8.slice(8, packet_u8.length);
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packet_u8 = null;
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switch (id) {
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case PACKET_ID_SEND_FRAME:
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handleSendFrame(raw_data, canvas, ctx);
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break;
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default:
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console.log(`Received unknown packet ${id}`);
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}
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}
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let printing_frame = false;
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function handleSendFrame(raw_data, canvas, ctx) {
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if (printing_frame) {
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return;
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}
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printing_frame = true;
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let data = raw_data;
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const stride = byteArrayToU32BigEndian(data.slice(0, 4));
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data = data.slice(4, data.length);
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const output_buffer_size = byteArrayToU32BigEndian(data.slice(0, 8));
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data = data.slice(8, data.length);
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console.log(data.length / 4 / MIN_WIDTH);
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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));
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}
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function byteArrayToU32BigEndian(input_array) {
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if (Endian.isLittleEndian()) {
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input_array = input_array.reverse();
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}
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const buffer = input_array.buffer;
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const output_u32_array = new Uint32Array(buffer);
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return output_u32_array[0];
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}
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function byteArrayToU64BigEndian(input_array) {
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if (Endian.isLittleEndian()) {
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input_array = input_array.reverse();
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}
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const buffer = input_array.buffer;
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const output_u64_array = new BigUint64Array(buffer);
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return output_u64_array[0];
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}
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function drawBitmap(bitmap, canvas, ctx) {
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ctx.drawImage(bitmap, 0, 0, canvas.width, canvas.height);
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printing_frame = false;
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}
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export default function Page() {
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const screenDimensions = useScreenDimensions();
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const emulatorDimensions = calculateSizeEmulator(screenDimensions);
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const canvasRef = React.useRef(null);
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function resizeCanvas(node) {
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const canvas = canvasRef.current;
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if (canvas) {
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canvas.width = emulatorDimensions.width;
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canvas.height = emulatorDimensions.height;
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const ctx = canvas.getContext('2d')
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fillBlack(canvas, ctx);
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}
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};
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const [hiddenFormSelectFiles, setHiddenFormSelectFiles] = React.useState(false);
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React.useEffect(resizeCanvas, [emulatorDimensions]);
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const refInputRom = React.useRef(null);
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const refInputSaveState = React.useRef(null);
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const onStartEmulation = (e) => {
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handleClickStartEmulationButton({
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e: e,
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setHiddenFormSelectFiles: setHiddenFormSelectFiles,
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inputRom: refInputRom.current,
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inputSaveState: refInputSaveState.current,
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canvas: canvasRef.current,
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});
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};
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return (
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<div>
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<CenterElement>
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<h2>msGBA Online Emulator for GBA.</h2>
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</CenterElement>
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<CenterElement>
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<CanvasGBAEmulator canvasRef={canvasRef}/>
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</CenterElement>
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<CenterElement hidden={hiddenFormSelectFiles}>
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<FormSelectFiles refInputRom={refInputRom}
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refInputSaveState={refInputSaveState}
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onStartEmulation={onStartEmulation}/>
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</CenterElement>
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</div>
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);
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}
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function getScreenDimensions() {
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return {
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width: document.body.clientWidth,
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height: document.body.clientHeight
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};
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}
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function useScreenDimensions() {
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const [screenDimensions, setScreenDimensions] = React.useState(getScreenDimensions());
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React.useEffect(() => {
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function onResize() {
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setScreenDimensions(getScreenDimensions());
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}
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window.addEventListener("resize", onResize);
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return () => {
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window.removeEventListener("resize", onResize);
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}
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}, []);
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return screenDimensions;
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}
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function fillBlack(canvas, ctx) {
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ctx.beginPath();
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ctx.rect(0, 0, canvas.width, canvas.height);
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ctx.fillStyle = 'black';
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ctx.fill();
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}
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function calculateSizeEmulator(screenDimensions) {
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const width = screenDimensions.width;
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const height = screenDimensions.height * 0.75;
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const emulatorDimensions = {};
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if (width < MIN_WIDTH || height < MIN_HEIGHT) {
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return {
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width: MIN_WIDTH,
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height: MIN_HEIGHT,
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};
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}
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const ratioWidth = Math.floor(width / MIN_WIDTH);
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const ratioHeight = Math.floor(height / MIN_HEIGHT);
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if (ratioWidth < ratioHeight) {
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emulatorDimensions.width = MIN_WIDTH * ratioWidth;
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emulatorDimensions.height = MIN_HEIGHT * ratioWidth;
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} else {
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emulatorDimensions.height = MIN_HEIGHT * ratioHeight;
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emulatorDimensions.width = MIN_WIDTH * ratioHeight;
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}
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return emulatorDimensions;
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}
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