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<!DOCTYPE html>
<html style="height: 100%; overflow: hidden; overflow-x: hidden;">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel='icon' type='image/gif' href='/favicon.gif'>
<title> Reduced System Layer </title>
</head>
<body style="margin: 0; height: 100%; overflow: hidden; overflow-x: hidden;">
<canvas style="margin: 0; width: 100%; height: 100%;" id="frame" oncontextmenu="event.preventDefault()"></canvas>
<script type="worklet">
registerProcessor(
'Sound_Ring',
class Sound_Ring extends AudioWorkletProcessor {
constructor(options) {
super();
this.ring = options.processorOptions.ring;
this.position = 0;
this.max_num_frames = this.ring.byteLength / 4;
}
process(input, output, parameters) {
let num_channels = output[0].length;
let num_samples = output[0][0].length;
let num_frames = num_samples * num_channels;
if (num_frames > this.max_num_frames) {
console.error("Sound buffer overflow");
return true;
}
let frames = new Float32Array(this.ring);
if (num_frames <= this.max_num_frames - this.position)
for (let j = 0; j < num_channels; ++j)
for (let i = 0; i < num_samples; ++i)
output[0][j][i] = frames[this.position + i * num_channels + j];
else {
let part_one = this.max_num_frames - this.position;
let part_two = num_frames - part_one;
for (let j = 0; j < num_channels; ++j) {
for (let i = 0; i < part_one; ++i)
output[0][j][i] = frames[this.position + i * num_channels + j];
for (let i = 0; i < part_two; ++i)
output[0][j][part_one + i] = frames[i * num_channels + j];
}
}
this.position = (this.position + num_frames) % this.max_num_frames;
return true;
}
}
);
</script>
<script type="text/javascript">
function key_from_code(code) {
switch (code) {
case "Backspace": return 8;
case "Tab": return 9;
case "Enter": return 10;
case "ControlLeft": return 11;
case "ControlRight": return 12;
case "ShiftLeft": return 13;
case "ShiftRight": return 14;
case "AltLeft": return 15;
case "AltRight": return 16;
case "ArrowLeft": return 17;
case "ArrowRight": return 18;
case "ArrowUp": return 19;
case "ArrowDown": return 20;
case "Pause": return 21;
case "Insert": return 22;
case "Home": return 23;
case "End": return 24;
case "PageUp": return 25;
case "PageDown": return 26;
case "Escape": return 27;
case "PrintScreen": return 28;
case "Space": return 32;
case "MetaLeft": return 33;
case "MetaRight": return 34;
case "Quote": return 39;
case "Comma": return 44;
case "Minus": return 45;
case "Period": return 46;
case "Slash": return 47;
case "Digit0": return 48;
case "Digit1": return 49;
case "Digit2": return 50;
case "Digit3": return 51;
case "Digit4": return 52;
case "Digit5": return 53;
case "Digit6": return 54;
case "Digit7": return 55;
case "Digit8": return 56;
case "Digit9": return 57;
case "Semicolon": return 59;
case "Equal": return 61;
case "BracketLeft": return 91;
case "Backslash": return 92;
case "BracketRight": return 93;
case "Backquote": return 96;
case "KeyA": return 97;
case "KeyB": return 98;
case "KeyC": return 99;
case "KeyD": return 100;
case "KeyE": return 101;
case "KeyF": return 102;
case "KeyG": return 103;
case "KeyH": return 104;
case "KeyI": return 105;
case "KeyJ": return 106;
case "KeyK": return 107;
case "KeyL": return 108;
case "KeyM": return 109;
case "KeyN": return 110;
case "KeyO": return 111;
case "KeyP": return 112;
case "KeyQ": return 113;
case "KeyR": return 114;
case "KeyS": return 115;
case "KeyT": return 116;
case "KeyU": return 117;
case "KeyV": return 118;
case "KeyW": return 119;
case "KeyX": return 120;
case "KeyY": return 121;
case "KeyZ": return 122;
case "Delete": return 127;
case "F1": return 145;
case "F2": return 146;
case "F3": return 147;
case "F4": return 148;
case "F5": return 149;
case "F6": return 150;
case "F7": return 151;
case "F8": return 152;
case "F9": return 153;
case "F10": return 154;
case "F11": return 155;
case "F12": return 156;
case "F13": return 157;
case "F14": return 158;
case "F15": return 159;
case "F16": return 160;
case "F17": return 161;
case "F18": return 162;
case "F19": return 163;
case "F20": return 164;
case "F21": return 165;
case "F22": return 166;
case "F23": return 167;
case "F24": return 168;
}
return 0;
};
function mod_from_event(ev) {
let mod = 0;
if (ev.ctrlKey) mod |= 1;
if (ev.shiftKey) mod |= 2;
if (ev.altKey) mod |= 4;
if (ev.metaKey) mod |= 8;
return mod;
};
function string_from_memory(bytes, offset) {
let len = 0;
while (bytes[offset + len] != 0)
++len;
return new TextDecoder("utf8").decode(bytes.subarray(offset, offset + len));
}
async function run(attrs) {
let wait_for_events = false;
let sleep_duration = 0;
let canvas;
let program;
let memory;
let pixels_address;
let context;
let animation_frame;
let sound_ready = false;
let sound_context;
let sound_init;
let sound_node;
let sound_num_channels;
let sound_buffer_address;
let sound_max_num_frames;
let sound_shared_ring;
let sound_position = 0;
canvas = attrs.canvas;
context = canvas.getContext("2d");
sound_init = async () => {
if (sound_ready || sound_context !== undefined)
return;
sound_context = new AudioContext({
sampleRate : program.instance.exports.js_sample_rate(),
});
let blob = new Blob(
[ document.querySelector("script[type=worklet]").innerText ],
{ type : "application/javascript", }
);
await sound_context.audioWorklet.addModule(URL.createObjectURL(blob));
sound_num_channels = program.instance.exports.js_num_channels();
sound_max_num_frames = program.instance.exports.js_max_num_audio_frames();
sound_buffer_address = program.instance.exports.js_sound_buffer();
sound_shared_ring = new SharedArrayBuffer(sound_max_num_frames * 4);
sound_node = new AudioWorkletNode(
sound_context,
"Sound_Ring",
{ numberOfInputs : 0,
outputChannelCount : [ sound_num_channels ],
processorOptions : { ring : sound_shared_ring, }, }
);
sound_node.connect(sound_context.destination);
program.instance.exports.js_sound_sync();
sound_ready = true;
};
program = await WebAssembly.instantiateStreaming(
attrs.wasm,
{
"wasi_snapshot_preview1" : {
clock_time_get : () => { return Date.now(); },
args_sizes_get : () => { throw new Error("Unexpected args_sizes_get call"); },
args_get : () => { throw new Error("Unexpected args_get call"); },
proc_exit : () => { throw new Error("Unexpected proc_exit call"); },
fd_close : () => { throw new Error("Unexpected fd_close call"); },
fd_write : () => { throw new Error("Unexpected fd_write call"); },
fd_seek : () => { throw new Error("Unexpected fd_seek call"); },
},
"env" : {
p_init : () => {
program.instance.exports.js_init();
memory = new Uint8Array(program.instance.exports.memory.buffer);
pixels_address = program.instance.exports.js_pixels();
document.title = string_from_memory(memory, program.instance.exports.js_title());
},
p_render_frame_impl : () => {
let data = new ImageData(
new Uint8ClampedArray(
memory.subarray(
pixels_address,
pixels_address + 4 * canvas.width * canvas.height
)
),
canvas.width,
canvas.height
);
context.putImageData(data, 0, 0);
},
p_clipboard_write : (size, text) => {
navigator.clipboard.writeText(
new TextDecoder().decode(memory.subarray(text, text + size))
).catch((e) => { console.error(e); });
},
p_cleanup : () => {},
p_wait_events_impl : () => { wait_for_events = true; },
p_sleep_for_impl : (time) => { sleep_duration += time; },
p_time_impl : Date.now,
p_handle_audio_impl : (samples_elapsed) => {
if (!sound_ready)
return;
let num_frames = samples_elapsed * sound_num_channels;
if (num_frames > sound_max_num_frames) {
console.error("Sound buffer overflow");
return;
}
let dst = new Float32Array(sound_shared_ring);
let src = new Float32Array(memory.subarray(sound_buffer_address, sound_buffer_address + sound_max_num_frames * 4));
if (num_frames <= sound_max_num_frames - sound_position)
for (let i = 0; i < num_frames; ++i) {
dst[sound_position + i] = src[sound_position + i];
src[sound_position + i] = 0.0;
}
else {
let part_one = sound_max_num_frames - sound_position;
let part_two = num_frames - part_one;
for (let i = 0; i < part_one; ++i) {
dst[sound_position + i] = src[sound_position + i];
src[sound_position + i] = 0.0;
}
for (let i = 0; i < part_two; ++i) {
dst[i] = src[i];
src[i] = 0.0;
}
}
sound_position = (sound_position + samples_elapsed * sound_num_channels) % sound_max_num_frames;
},
floor : Math.floor,
ceil : Math.ceil,
sqrt : Math.sqrt,
pow : Math.pow,
log : Math.log,
log2 : Math.log2,
log10 : Math.log10,
exp : Math.exp,
sin : Math.sin,
cos : Math.cos,
tan : Math.tan,
asin : Math.asin,
acos : Math.acos,
atan : Math.atan,
atan2 : Math.atan2,
memset : (dst, val, num) => { program.instance.exports.js_memset(dst, val, num); },
memcpy : (dst, src, num) => { program.instance.exports.js_memcpy(dst, src, num); },
},
}
);
program.instance.exports.js_main(document.location.href);
animation_frame = (time) => {
if (attrs.fit_window) {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
wait_for_events = false;
program.instance.exports.js_frame(canvas.width, canvas.height);
if (!wait_for_events) {
if (sleep_duration > 0) {
let timeout = sleep_duration;
sleep_duration = 0;
setTimeout(() => {
window.requestAnimationFrame(animation_frame);
}, timeout);
} else
window.requestAnimationFrame(animation_frame);
}
};
window.addEventListener("resize", (ev) => {
window.requestAnimationFrame(animation_frame);
});
canvas.addEventListener("mousedown", (ev) => {
sound_init();
program.instance.exports.js_mousedown(ev.buttons);
window.requestAnimationFrame(animation_frame);
});
canvas.addEventListener("mouseup", (ev) => {
program.instance.exports.js_mouseup(ev.buttons);
window.requestAnimationFrame(animation_frame);
});
canvas.addEventListener("mousemove", (ev) => {
program.instance.exports.js_mousemove(ev.clientX, ev.clientY);
window.requestAnimationFrame(animation_frame);
});
window.addEventListener("keydown", (ev) => {
ev.preventDefault();
if (!ev.repeat) {
let mod = mod_from_event(ev);
let key = key_from_code(ev.code);
if (key != 0)
program.instance.exports.js_keydown(key, mod);
window.requestAnimationFrame(animation_frame);
}
});
window.addEventListener("keyup", (ev) => {
ev.preventDefault();
if (!ev.repeat) {
let mod = mod_from_event(ev);
let key = key_from_code(ev.code);
if (key != 0)
program.instance.exports.js_keyup(key, mod);
window.requestAnimationFrame(animation_frame);
}
});
window.requestAnimationFrame(animation_frame);
}
run({
canvas : document.getElementById("frame"),
wasm : fetch("index.wasm"),
fit_window : true,
}).catch((e) => console.error(e));
</script>
</body>
</html>
|
