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gbsplayer.html
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gbsplayer.html
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<title>Gameboy Thingy</title>
<head>
<script src="amebo.js"></script>
<script src="iosJSnode.js"></script>
<style>
.gbsPlayer {
background-image: url("gbs/bg.svg");
width: 300px;
height: 30px;
position: relative;
font-family: "Trebuchet MS", sans-serif;
font-size: 16px;
font-weight: bold;
}
.gbsPlay {
width: 18px;
height: 18px;
margin: 6px;
}
.gbsPause {
width: 18px;
height: 18px;
margin: 6px;
}
.gbsMarqueeContain {
width: 170px;
height: 30px;
display: inline-block;
overflow: hidden;
}
.gbsLeftBut {
width: 16px;
height: 16px;
margin-top: 7px;
vertical-align: top;
}
.gbsSelected {
width: 64px;
height: 26px;
margin-top: 4px;
display: inline-block;
color: #009388;
text-align: center;
vertical-align: top;
}
.gbsRightBut {
width: 16px;
height: 16px;
margin-top: 7px;
vertical-align: top;
}
.gbsMarqueeScroll {
height: 26px;
top: 4px;
position: relative;
white-space: nowrap;
width: auto;
max-width: 1000px;
display: inline-block;
padding-left: 8px;
padding-right: 8px;
color: #B90546
}
.gbsMarqueeTitle {
color: #5254A5;
}
.gbsMarqueeAuthor {
color: #79AD36;
}
.gbsMarqueeCopyright {
color: #DDB10A;
}
.gbsFadeover {
position: absolute;
margin-left: -170px;
}
#templates {
display: none;
}
</style>
</head>
<body onload="gbs = new gbsPlayer('crystal.gbs', null); document.getElementById('targetDiv').appendChild(gbs.element)">
<div id="templates">
<div class="gbsPlayer" id="playerTemplate">
<img src="gbs/play.svg" class="gbsPlay"><img src="gbs/pause.svg" class="gbsPause" style="display: none;"><div class="gbsMarqueeContain">
<div class="gbsMarqueeScroll"><span class="gbsMarqueeTitle">Pokemon Crystal</span> - <span class="gbsMarqueeAuthor">J. Masuda, M. Aoki, G. Ichinose</span> - <span class="gbsMarqueeCopyright">2000 Nintendo</span></div>
</div><img src="gbs/fadeover.svg" class="gbsFadeover"></img><img src="gbs/lefta.svg" class="gbsLeftBut"><div class="gbsSelected">24/100</div><img src="gbs/righta.svg" class="gbsRightBut">
</div>
</div>
<div id="targetDiv"></div>
<br>
ROM File:
<input type="file" id="file"></input>
<script>
function loadROMfileReader(evt) {
var file = evt.target.files[0];
var reader = new FileReader();
reader.onload = (function(theFile) {
return function(e) {
gbs.loadGBS(e.target.result);
};
})(file);
reader.readAsArrayBuffer(file);
}
document.getElementById("file").addEventListener('change', loadROMfileReader, false);
window.gbsPlayer = function(file, canvas, insertTarget) {
var gameboy = new gb(null, canvas, null);
this.gameboy = gameboy;
var version, numSongs, firstSong, loadAddr, initAddr, playAddr, stackP, timerM, timerC, useTimer, playerDOM, myOBJ, current = 0, marqueePercent=0;
var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
window.requestAnimationFrame = requestAnimationFrame;
this.title = "Not loaded";
this.author = "";
this.copyright = "";
this.numSongs = 0;
this.element = null; //add this somewhere on the page
myOBJ = this;
initDOM();
function initDOM() {
playerDOM = document.getElementById("playerTemplate").cloneNode(true);
myOBJ.element = playerDOM;
console.log(this.element);
playerDOM.getElementsByClassName("gbsLeftBut")[0].onclick = prevTrack;
playerDOM.getElementsByClassName("gbsRightBut")[0].onclick = nextTrack;
playerDOM.getElementsByClassName("gbsPlay")[0].onclick = cyclePause;
playerDOM.getElementsByClassName("gbsPause")[0].onclick = cyclePause;
updateMeta();
marqueeUpdate();
}
function cyclePause() {
gameboy.paused = !gameboy.paused;
updateSong();
}
function nextTrack() {
if (current+1<numSongs) {
myOBJ.chooseTrack(current+1);
updateSong();
}
}
function prevTrack() {
if (current>0) {
myOBJ.chooseTrack(current-1);
updateSong();
}
}
function marqueeUpdate() {
marqueePercent += 0.005;
var marquee = playerDOM.getElementsByClassName("gbsMarqueeScroll")[0];
var scrollWidth = -Math.max(0, marquee.clientWidth-170);
marquee.style.left = (scrollWidth*((1-Math.cos(marqueePercent))/2))+"px";
if (requestAnimationFrame != null) requestAnimationFrame(marqueeUpdate);
else setTimeout(marqueeUpdate, 16);
}
function updateMeta() {
playerDOM.getElementsByClassName("gbsMarqueeTitle")[0].innerText = myOBJ.title;
playerDOM.getElementsByClassName("gbsMarqueeAuthor")[0].innerText = myOBJ.author;
playerDOM.getElementsByClassName("gbsMarqueeCopyright")[0].innerText = myOBJ.copyright;
}
function updateSong() {
playerDOM.getElementsByClassName("gbsSelected")[0].innerText = (current+firstSong)+"/"+(numSongs);
playerDOM.getElementsByClassName("gbsLeftBut")[0].style.opacity = (current == 0)?0.33:1;
playerDOM.getElementsByClassName("gbsRightBut")[0].style.opacity = (current >= numSongs-1)?0.33:1;
playerDOM.getElementsByClassName("gbsPlay")[0].style.display = (gameboy.paused)?"inline":"none";
playerDOM.getElementsByClassName("gbsPause")[0].style.display = (gameboy.paused)?"none":"inline";
}
this.loadGBSurl = function(url) {
var xhr = new XMLHttpRequest();
xhr.open("POST", url);
xhr.responseType = "arraybuffer";
var parent = this;
xhr.onload = function() {
if (xhr.status != 200) return;
parent.loadGBS(xhr.response);
}
xhr.send();
}
this.loadGBS = function(data) {
var view = new DataView(data);
version = view.getUint8(3);
numSongs = view.getUint8(4);
firstSong = view.getUint8(5);
loadAddr = view.getUint16(6, true);
initAddr = view.getUint16(8, true);
playAddr = view.getUint16(10, true);
stackP = view.getUint16(12, true);
timerM = view.getUint8(14);
timerC = view.getUint8(15);
this.title = readString(view, 16, 32);
this.author = readString(view, 48, 32);
this.copyright = readString(view, 80, 32);
this.numSongs = 0;
updateMeta();
useTimer = (timerC & 4)>0;
gameboy.loadROMBuffer(data); //loads file, inits gb... We need a special mbc and full control though!
load();
init(17);
}
if (file != null) this.loadGBSurl(file);
function readString(view, off, length) {
var string = "";
for (var i=0; i<length; i++) {
var value = view.getUint8(off++);
if (value == 0) return string;
string += String.fromCharCode(value);
}
return string;
}
function init(num) {
current = num;
gameboy.scopeEval('registers = new Uint8Array(['+num+', 0, 0, 0, 0, 0, 0]);');
gameboy.scopeEval('RAM = new Uint8Array((CGB)?0x8000:0x2000);');
callGBFunction(initAddr);
updateSong();
}
function callGBFunction(addr) {
gameboy.scopeEval('StackPush(PC);');
gameboy.scopeEval('PC = '+(addr)+';');
}
function load() {
gameboy.scopeEval('CGB = true; reset(true); biosActive = false; CRAM = new Uint8Array(0x4000);');
gameboy.scopeEval('MBC = {type: 6, hardware: ["RAM"]}; this.MBC = MBC; MBC.ROMbank = 1; MBCReadHandler = MBCReadHandlers[6]; MBCWriteHandler = MBCWriteHandlers[6];');
gameboy.RSToff = loadAddr;
gameboy.MBC.lowData = new Array(0x400);
gameboy.MBC.lowData[0] = 0x76; //HALT
gameboy.MBC.lowData[1] = 0xFB; //EI
gameboy.MBC.lowData[2] = 0xC3; //jump back to halt
gameboy.MBC.lowData[0x40] = 0xC3; //jump to play address on vbl
gameboy.MBC.lowData[0x41] = playAddr&255;
gameboy.MBC.lowData[0x42] = playAddr>>8;
gameboy.MBC.lowData[0x50] = 0xC3; //same for timer
gameboy.MBC.lowData[0x51] = playAddr&255;
gameboy.MBC.lowData[0x52] = playAddr>>8;
//might want to have more substantial player code in future.
gameboy.scopeEval('MemWrite(0xFF06, '+timerM+');'); //write timer modulo
gameboy.scopeEval('MemWrite(0xFF07, '+(timerC&7)+');'); //write timer control
gameboy.scopeEval('MemWrite(0xFF26, 255);'); //sound on
gameboy.scopeEval('MemWrite(0xFF24, 255);'); //volume default to max
gameboy.scopeEval('SP = '+stackP)
gameboy.scopeEval('MBC.offset = '+loadAddr);
gameboy.scopeEval('PC = 0; EI();');
if (timerC&128) gameboy.scopeEval('MemWrite(0xFF4D, 1); STOP();');
gameboy.scopeEval("IORAM[0x40] |= 0x80");
if (useTimer) {
gameboy.scopeEval('MemWrite(0xFFFF, 4);'); //enable timer interrupt
} else {
gameboy.scopeEval('MemWrite(0xFFFF, 1);'); //enable vbl interrupt
}
}
this.chooseTrack = function(track) {
load(); //do this to flush memory
init(track);
}
}
</script>
</body>