 <!DOCTYPE html>
<html lang="en">
    <head>
        <title>GBA Rocks</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
    </head>
    <body>
        <!-- Screen of the GBA.js -->
        <canvas id="screen" width="480" height="320"></canvas>

        <!-- Start Controls -->
        <div id="controls">
			<!-- Start App controls -->
			<h4>App Controls</h4>
			<div id="preload">
				<button id="select"> Select ROM file </button>
				<input id="loader" type="file" accept=".gba" />
				<button id="select-savegame-btn">Upload Savegame</button>
				<input id="saveloader" type="file" />
			</div>
			<!-- End App controls -->
			<br>
			<!-- Start ingame controls -->
			<h4>In-game controls</h4>
			<div id="ingame" class="hidden">
				<button id="pause">Pause game</button>
				<button id="reset-btn">Reset</button>
				<button id="download-savegame">Download Savegame File</button>

				<div id="sound">
					<p>Audio enabled</p>
					<input type="checkbox" id="audio-enabled-checkbox" checked="checked" />
					<p>Change sound level</p>
					<input id="volume-level-slider" type="range" min="0" max="1" value="1" step="any" />
				</div>
			</div>
			<!-- End ingame controls -->
		</div>
		<!-- End Controls -->
		 

	<script src="js/util.js"></script>
	<script src="js/core.js"></script>
	<script src="js/arm.js"></script>
	<script src="js/thumb.js"></script>
	<script src="js/mmu.js"></script>
	<script src="js/io.js"></script>
	<script src="js/audio.js"></script>
	<script src="js/video.js"></script>
	<script src="js/video/proxy.js"></script>
	<script src="js/video/software.js"></script>
	<script src="js/irq.js"></script>
	<script src="js/keypad.js"></script>
	<script src="js/sio.js"></script>
	<script src="js/savedata.js"></script>
	<script src="js/gpio.js"></script>
	<script src="js/gba.js"></script>
	<!-- 
		This file is optional as it only is a function to load the ROM 
		But the function loadRom needs to exist !
	-->
	<script src="resources/xhr.js"></script>


	<!-- Start APP Scripts -->
	<script>
		var gba;
		var runCommands = [];

		// Setup the emulator
		try {
			gba = new GameBoyAdvance();
			gba.keypad.eatInput = true;

			gba.setLogger(function (level, error) {
				console.error(error);
				
				gba.pause();
				
				var screen = document.getElementById('screen');
				
				if (screen.getAttribute('class') == 'dead') {
					console.log('We appear to have crashed multiple times without reseting.');
					return;
				}


				// Show error image in the emulator screen
				// The image can be retrieven from the repository
				var crash = document.createElement('img');
				crash.setAttribute('id', 'crash');
				crash.setAttribute('src', 'resources/crash.png');
				screen.parentElement.insertBefore(crash, screen);
				screen.setAttribute('class', 'dead');
			});
		} catch (exception) {
			gba = null;
		}

		// Initialize emulator once the browser loads
		window.onload = function () {
			if (gba && FileReader) {
				var canvas = document.getElementById('screen');
				gba.setCanvas(canvas);

				gba.logLevel = gba.LOG_ERROR;

				// Load the BIOS file of GBA (change the path according to yours)
				loadRom('resources/bios.bin', function (bios) {
					gba.setBios(bios);
				});

				if (!gba.audio.context) {
					// Remove the sound box if sound isn't available
					var soundbox = document.getElementById('sound');
					soundbox.parentElement.removeChild(soundbox);
				}

			} else {
				var dead = document.getElementById('controls');
				dead.parentElement.removeChild(dead);
			}
		}

		function fadeOut(id, nextId, kill) {
			var e = document.getElementById(id);
			var e2 = document.getElementById(nextId);
			if (!e) {
				return;
			}

			var removeSelf = function () {
				if (kill) {
					e.parentElement.removeChild(e);
				} else {
					e.setAttribute('class', 'dead');
					e.removeEventListener('webkitTransitionEnd', removeSelf);
					e.removeEventListener('oTransitionEnd', removeSelf);
					e.removeEventListener('transitionend', removeSelf);
				}
				if (e2) {
					e2.setAttribute('class', 'hidden');
					setTimeout(function () {
						e2.removeAttribute('class');
					}, 0);
				}
			}

			e.addEventListener('webkitTransitionEnd', removeSelf, false);
			e.addEventListener('oTransitionEnd', removeSelf, false);
			e.addEventListener('transitionend', removeSelf, false);
			e.setAttribute('class', 'hidden');
		}

		/**
		 * Starts the emulator with the given ROM file
		 * 
		 * @param file 
		 */
		function run(file) {
			var dead = document.getElementById('loader');

			dead.value = '';
			
			var load = document.getElementById('select');
			load.textContent = 'Loading...';
			load.removeAttribute('onclick');
			
			var pause = document.getElementById('pause');
			pause.textContent = "PAUSE";
			
			gba.loadRomFromFile(file, function (result) {
				if (result) {
					for (var i = 0; i < runCommands.length; ++i) {
						runCommands[i]();
					}

					runCommands = [];
					fadeOut('preload', 'ingame');
					fadeOut('instructions', null, true);
					gba.runStable();
				} else {
					load.textContent = 'FAILED';

					setTimeout(function () {
						load.textContent = 'SELECT';
						
						load.onclick = function () {
							document.getElementById('loader').click();
						};

					}, 3000);
				}
			});
		}

		/**
		 * Resets the emulator
		 * 
		 */
		function reset() {
			gba.pause();
			gba.reset();

			var load = document.getElementById('select');
			
			load.textContent = 'SELECT';

			var crash = document.getElementById('crash');

			if (crash) {
				var context = gba.targetCanvas.getContext('2d');
				context.clearRect(0, 0, 480, 320);
				gba.video.drawCallback();
				crash.parentElement.removeChild(crash);
				var canvas = document.getElementById('screen');
				canvas.removeAttribute('class');
			} else {
				lcdFade(gba.context, gba.targetCanvas.getContext('2d'), gba.video.drawCallback);
			}

			load.onclick = function () {
				document.getElementById('loader').click();
			};

			fadeOut('ingame', 'preload');

			// Clear the ROM
			gba.rom = null;
		}

		/**
		 * Stores the savefile data in the emulator.
		 * 
		 * @param file 
		 */
		function uploadSavedataPending(file) {
			runCommands.push(function () { 
				gba.loadSavedataFromFile(file) 
			});
		}

		/**
		 * Toggles the state of the game
		 */
		function togglePause() {
			var e = document.getElementById('pause');

			if (gba.paused) {
				gba.runStable();
				e.textContent = "PAUSE";
			} else {
				gba.pause();
				e.textContent = "UNPAUSE";
			}
		}

		/**
		 * From a canvas context, creates an LCD animation that fades the content away.
		 * 
		 * @param context 
		 * @param target 
		 * @param callback 
		 */
		function lcdFade(context, target, callback) {
			var i = 0;

			var drawInterval = setInterval(function () {
				i++;

				var pixelData = context.getImageData(0, 0, 240, 160);

				for (var y = 0; y < 160; ++y) {
					for (var x = 0; x < 240; ++x) {
						var xDiff = Math.abs(x - 120);
						var yDiff = Math.abs(y - 80) * 0.8;
						var xFactor = (120 - i - xDiff) / 120;
						var yFactor = (80 - i - ((y & 1) * 10) - yDiff + Math.pow(xDiff, 1 / 2)) / 80;
						pixelData.data[(x + y * 240) * 4 + 3] *= Math.pow(xFactor, 1 / 3) * Math.pow(yFactor, 1 / 2);
					}
				}
				
				context.putImageData(pixelData, 0, 0);

				target.clearRect(0, 0, 480, 320);

				if (i > 40) {
					clearInterval(drawInterval);
				} else {
					callback();
				}
			}, 50);
		}

		/**
		 * Set the volume of the emulator.
		 * 
		 * @param value 
		 */
		function setVolume(value) {
			gba.audio.masterVolume = Math.pow(2, value) - 1;
		}
	</script>
	<!-- End APP Scripts -->

	<!-- Start Events Scripts -->
	<script>
		// If clicked, simulate click on the File Select input to load a ROM
		document.getElementById("select").addEventListener("click", function(){
			document.getElementById("loader").click();
		}, false);
		
		// Run the emulator with the loaded ROM
		document.getElementById("loader").addEventListener("change", function(){
			var ROM = this.files[0];
 			run(ROM);
		}, false);

		// If clicked, simulate click on the File Select Input to load the savegame file
		document.getElementById("select-savegame-btn").addEventListener("click", function(){
			document.getElementById('saveloader').click();
		}, false);

		// Load the savegame to the emulator
		document.getElementById("saveloader").addEventListener("change", function(){
			var SAVEGAME = this.files[0];
			uploadSavedataPending(SAVEGAME);
		}, false); 

		// Pause/Resume game
		document.getElementById("pause").addEventListener("click", function(){
			 togglePause();
		}, false);
		
		// Reset game
		document.getElementById("reset-btn").addEventListener("click", function(){
			 reset();
		}, false);

		// Download the savegamefile
		document.getElementById("download-savegame").addEventListener("click", function(){
			 gba.downloadSavedata();
		}, false);
		
		// Mute/Unmute emulator
		document.getElementById("audio-enabled-checkbox").addEventListener("change", function(){
			gba.audio.masterEnable = this.checked;
		}, false);

		// Handle volume level slider
		document.getElementById("volume-level-slider").addEventListener("change", function(){
			var volumeLevel = this.value;
			setVolume(volumeLevel);
		}, false);
		document.getElementById("volume-level-slider").addEventListener("input", function(){
			var volumeLevel = this.value;
			setVolume(volumeLevel);
		}, false); 

		// In order to pause/resume the game when the user changes the website tab in the browser
		// add the 2 following listeners to the window !
		// 
		// This feature is problematic/tricky to handle, so you can make it better if you need to
		window.onblur = function () {
			if(gba.hasRom()){
				var e = document.getElementById('pause');

				if (!gba.paused) {
					gba.pause();
					e.textContent = "UNPAUSE";

					console.log("Window Focused: the game has been paused");
				}
			}
		};

		window.onfocus = function () {
			if(gba.hasRom()){
				var e = document.getElementById('pause');

				if (gba.paused) {
					gba.runStable();
					e.textContent = "PAUSE";

					console.log("Window Focused: the game has been resumed");
				}
			}
		};
	</script>
	<!-- End Events Scripts -->
</body>
</html>

created 1 year ago

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