171 lines
6.8 KiB
Plaintext
171 lines
6.8 KiB
Plaintext
<!DOCTYPE html>
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<html>
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<head>
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<style>
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body {
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min-height: 100vh;
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}
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.center-content {
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display: flex;
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justify-content: center;
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}
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form label, form input {
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display: block;
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}
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</style>
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</head>
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<body>
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<div class="center-content">
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<h2>msGBA Emulator Online for GBA.</h2>
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</div>
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<div class="center-content">
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<canvas id="emulator" width="240" height="160">
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</canvas>
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</div>
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<div class="center-content" id="form-select-files">
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<form>
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<label for="rom">
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Rom file
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<input type="file" id="rom" name="rom"/>
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</label
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<label for="savestate">
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Savestate (A ss file from mgba...)
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<input type="file" id="savestate" name="savestate"/>
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</label>
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<input type="button" value="Start emulation" id="start-emulation-button">
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</form>
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</div>
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<script>
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"use strict";
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const MIN_WIDTH = 240;
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const MIN_HEIGHT = 160;
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const canvas = document.querySelector('#emulator');
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const ctx = canvas.getContext('2d');
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const emulator_dimensions = { width: MIN_WIDTH, height: MIN_HEIGHT };
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const start_emulation_button = document.querySelector('#start-emulation-button');
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const rom_file_selector = document.querySelector('#rom');
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const savestate_file_selector = document.querySelector('#savestate');
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const PACKET_ID_HELLO = 0n;
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// Send is sent from server, so it is get here but whatever, it is the bad naming of the protocol.
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const PACKET_ID_SEND_FRAME = 1n;
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let websocket = null;
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let is_little_endian = true;
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(()=>{
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let buf = new ArrayBuffer(4);
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let buf8 = new Uint8ClampedArray(buf);
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let data = new Uint32Array(buf);
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data[0] = 0xdeadbeef;
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if(buf8[0] === 0xde){
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is_little_endian = false;
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}
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})();
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console.log((is_little_endian ? 'Little endian' : 'Big endian') + " Detected");
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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 (is_little_endian) {
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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 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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start_emulation_button.addEventListener('click', () => {
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if (rom_file_selector.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 (savestate_file_selector.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 = rom_file_selector.files[0];
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const savestate_file = savestate_file_selector.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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websocket = new WebSocket(`ws://${location.host}/ws`);
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websocket.addEventListener('open', () => {
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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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});
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});
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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 sendPacket(websocket, id, raw_data) {
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const packet_u8 = concatU8Array(
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concatU8Array(u64ToByteArrayBigEndian(BigInt(id)), u64ToByteArrayBigEndian(BigInt(raw_data.length))),
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raw_data
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);
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const packet_blob = packet_u8.buffer;
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console.log('Sending packet');
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websocket.send(packet_blob);
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}
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function resizeEmulator(canvas) {
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const width = document.body.clientWidth;
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const height = document.body.clientHeight;
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if (width < MIN_WIDTH || height < MIN_HEIGHT) {
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alert('Size too small.');
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return;
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}
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const ratio_width = Math.floor(width / MIN_WIDTH);
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const ratio_height = Math.floor(height / MIN_HEIGHT);
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if (ratio_width < ratio_height) {
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emulator_dimensions.width = MIN_WIDTH * ratio_width;
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emulator_dimensions.height = MIN_HEIGHT * ratio_width;
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} else {
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emulator_dimensions.height = MIN_HEIGHT * ratio_height;
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emulator_dimensions.width = MIN_WIDTH * ratio_height;
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}
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canvas.width = emulator_dimensions.width;
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canvas.height = emulator_dimensions.height;
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fillBlack(ctx);
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}
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function fillBlack(ctx) {
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ctx.beginPath();
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ctx.rect(0, 0, emulator_dimensions.width, emulator_dimensions.height);
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ctx.fillStyle = 'black';
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ctx.fill();
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}
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function connectWebsocket(rom, savestate) {
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}
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window.addEventListener('resize', () => {
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resizeEmulator(canvas);
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});
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resizeEmulator(canvas);
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</script>
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</body>
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</html>
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