mirror of https://github.com/jasonm76/GSjs.git
131 lines
3.3 KiB
JavaScript
131 lines
3.3 KiB
JavaScript
// A cross-browser requestAnimationFrame
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// See https://hacks.mozilla.org/2011/08/animating-with-javascript-from-setinterval-to-requestanimationframe/
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var requestAnimFrame = (function(){
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return window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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window.oRequestAnimationFrame ||
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window.msRequestAnimationFrame ||
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function(callback){
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window.setTimeout(callback, 1000 / 60);
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};
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})();
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var mem64k = new DebugMemController();
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var cpu = Cpu(mem64k);
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var dis = new Disassembler(mem64k);
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var mon = new Monitor(cpu);
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var intervalId; // id for interval timer
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var print_flag = true;
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var old_irq_pin;
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var old_nmi_pin;
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var statusElem;
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// The main game loop
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var lastTime;
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function main() {
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console.log("Inside main");
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var now = Date.now();
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var dt = (now - lastTime) / 1000.0;
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runCPU(dt);
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render();
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lastTime = now;
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requestAnimFrame(main);
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}
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function init() {
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console.log("Inside init");
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// Create the canvas
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var canvas = document.createElement("canvas");
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var ctx = canvas.getContext("2d");
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canvas.width = 512;
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canvas.height = 480;
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document.getElementById("screen").appendChild(canvas);
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statusElem = document.getElementById("status");
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mem64k.loadData(0x0000, resources.get('test6502'));
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cpu.reset();
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old_irq_pin = (mem64k.getData(0xBFFC) & 0x01) > 0;
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old_nmi_pin = ((mem64k.getData(0xBFFC) & 0x02) >> 1) > 0;
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cpu.setPC(0x0400);
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console.log("Press keys to operate CPU:");
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console.log("0) reset");
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console.log("1) NMI");
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console.log("2) IRQ");
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console.log("3) end simulation");
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print_flag = false;
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statusElem.innerHTML = "Running";
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lastTime = Date.now;
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main();
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}
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function runCPU(dt) {
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var numCycles = dt*1022727;
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if (print_flag) {
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console.log(mon.getStatusStr());
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dis.disassemble(cpu.regPC());
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}
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cpu_start = Date.now();
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cpu.run(numCycles);
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cpu_dt = (Date.now() - cpu_start) / 1000.0;
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console.log('CPU time = ' + cpu_dt);
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var irq_pin = (mem64k.getData(0xBFFC) & 0x01) > 0;
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var nmi_pin = ((mem64k.getData(0xBFFC) & 0x02) >> 1) > 0;
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if (irq_pin != old_irq_pin) {
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console.log("Changed IRQ pin: " + old_irq_pin + " --> " + irq_pin);
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old_irq_pin = irq_pin;
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cpu.irq_pin = irq_pin;
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}
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if (nmi_pin != old_nmi_pin) {
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console.log("Changed NMI pin: " + old_nmi_pin + " --> " + nmi_pin);
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old_nmi_pin = nmi_pin;
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cpu.nmi_pin = nmi_pin;
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}
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}
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function render() {
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// Nothing yet
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}
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document.onkeypress = function (e) {
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e = e || window.event;
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if (e.keyCode === 51) {
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clearInterval(intervalId);
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console.log("STOPPED");
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statusElem.innerHTML = "STOPPED";
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}
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else if (e.keyCode === 48) { cpu.reset(); statusElem.innerHTML = "Running (" + intervalId + "): ";}
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else if(e.keyCode === 49) { cpu.nmi(); statusElem.innerHTML += "1 ";}
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else if(e.keyCode === 50) { cpu.irq(); statusElem.innerHTML += "2 ";}
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else if(e.keyCode >= 0 && e.keyCode <= 255) {
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mem64k.setData(mem64k.in_port, e.keyCode);
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}
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};
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$(document).ready(function() {
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console.log("Document ready");
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$.when(
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resources.loadBinary('/tests/6502_functional_test.bin', 'test6502')
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).then(function() {
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init();
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}, function() {
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console.log("Resource not available");
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}) ;
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});
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