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mutagen.js
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mutagen.js
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(function () {
if (window.mutagen_stop) {
try {
window.mutagen_stop();
} catch (error) {
console.log(error);
alert("Failed to stop mutagen! It's out of control!");
}
}
var existing_style = document.querySelector("#mutagen-style");
// var existing_thumbnails_container = document.querySelector("#mutagen-thumbnails-container"); // specimen palette
var existing_ui_container = document.querySelector("#mutagen-ui-container");
var existing_logo_canvas = document.getElementById("mutagen-logo-canvas-debug");
if (existing_logo_canvas) {
existing_logo_canvas.remove();
}
if (existing_style) {
existing_style.remove();
}
if (existing_ui_container) {
existing_ui_container.remove();
return;
}
function parse_for_edit_points_even_in_comments(code) {
var doc = [];
// the first group here is in lieu of negative lookbehinds in javascript,
// to avoid starting matching from inside an identifier
// (the last group `(?!e)` is because we don't handle exponents currently)
var numbers_regexp = /([^a-z0-9$_]|^)(0x[\dA-F]+|\d+(?:\.\d*)?|\.\d+)(?!e)/gi;
var match;
var last_match_lastIndex = 0;
while ((match = numbers_regexp.exec(code)) !== null) {
var [match_str, negative_match_group_str, num_str] = match;
doc.push(code.slice(last_match_lastIndex, match.index + negative_match_group_str.length));
if (isNaN(num_str)) {
console.warn(`somehow matched ${num_str} (full match_str = ${match_str})`);
doc.push(edit);
} else {
var edit_point = {
type: "number_literal",
text: num_str,
};
doc.push(edit_point);
}
last_match_lastIndex = numbers_regexp.lastIndex;
}
doc.push(code.slice(last_match_lastIndex));
return doc;
}
function parse_for_edit_points(code) {
// TODO: loosely ignore block comments too
// (ignoring the complexity of things in strings, like `"// /* /*/"`, or `var rgx = /http:\/\/foo\/*/i`)
var doc = [];
code.split("\n").forEach((line) => {
if (line.match(/^\s*\/\//)) {
doc.push(line);
} else {
doc = doc.concat(parse_for_edit_points_even_in_comments(line));
}
doc.push("\n");
});
doc = doc.reduce((doc, part) => {
var last_part = doc[doc.length - 1];
if (typeof part === "string" && typeof last_part === "string") {
doc[doc.length - 1] = last_part + part;
return doc;
}
doc.push(part);
return doc;
}, []);
return doc;
}
function document_structures_are_equivalent(doc_a, doc_b) {
if (doc_a.length !== doc_b.length) {
return false;
}
for (var i = 0; i < doc_a.length; i++) {
var part_a = doc_a[i];
var part_b = doc_b[i];
if (typeof part === "string") {
if (i === 0) {
if (remove_attribution_header(part_a) !== remove_attribution_header(part_b)) {
return false;
}
} else if (part_a !== part_b) {
return false;
}
}
}
return true;
}
function mutate_number_literal(num_str, mutation_chance) {
var n = parseFloat(num_str);
var original_n = n;
// keep number as float or int (determined by whether there's a decimal point in GLSL)
var had_dot = num_str.indexOf(".") > -1;
var keep_as_int_or_float = (n) => {
if (had_dot && `${n}`.indexOf(".") === -1) {
return `${n}.0`;
} else if (!had_dot) {
return `${Math.ceil(n)}`;
}
return `${n}`;
};
if (Math.random() < mutation_chance) { n += 1; }
if (Math.random() < mutation_chance) { n -= 1; }
if (Math.random() < mutation_chance) { n /= 2; }
if (Math.random() < mutation_chance) { n *= 2; }
if (!isFinite(n)) {
console.warn(`somehow got ${n} from ${JSON.stringify(num_str)}`);
return num_str;
} else if (n < 0 && original_n >= 0) {
return `(${keep_as_int_or_float(n)})`;
}
return keep_as_int_or_float(n);
}
function render_doc_to_string(doc, edits) {
return doc.map((part, index) => {
if (typeof part === "string") {
return part;
} else {
var edit = edits.find((edit) => index === edit.index_in_doc);
if (edit) {
return edit.text;
} else {
return part.text;
}
}
}).join("");
}
function get_code_from_page() {
var cm_el = document.querySelector('.CodeMirror');
if (cm_el) {
var cm = cm_el.CodeMirror;
return cm.getValue();
}
var ace_el = document.querySelector('.ace_editor');
if (ace_el && window.ace && window.ace.edit) {
var editor = window.ace.edit(ace_el);
return editor.getValue();
}
var textarea = document.querySelector("textarea#code, textarea"); // bytebeat, and potentially weird random things on the web
if (textarea) {
return textarea.value;
}
alert("No code text editor found on the page");
return "";
}
var confirmed_erase_undo_history = false;
function set_code_on_page(new_code) {
var cm_el = document.querySelector('.CodeMirror');
if (cm_el) {
var cm = cm_el.CodeMirror;
cm.setValue(new_code);
return;
}
var ace_el = document.querySelector('.ace_editor');
if (ace_el && window.ace && window.ace.edit) {
var editor = window.ace.edit(ace_el);
editor.setValue(new_code);
return;
}
var textarea = document.querySelector("textarea#code, textarea"); // bytebeat, and potentially weird random things on the web
if (textarea) {
if (confirmed_erase_undo_history || confirm("This will erase undo/redo history for the textarea, continue?")) {
confirmed_erase_undo_history = true;
textarea.value = new_code;
}
return;
}
// TODO for bytebeat: would seem to need to be async (for undo history to be kept intact)
// textarea.focus();
// setTimeout(function(){
// textarea.select();
// document.execCommand("InsertText", false, new_code);
// });
}
function find_problem_in_output_on_page() {
// shadertoy
var error_message_el = document.querySelector(".CodeMirror-linewidget .errorMessage");
if (error_message_el && getComputedStyle(error_message_el).visibility !== "hidden") {
return new Error(`compile failed: ${error_message_el.textContent}`);
}
// shadertoy
if (document.querySelector(".tab.errorYes")) {
return new Error("compile failed (in some tab)");
}
// shaderoo
var ace_el = document.querySelector(".ace_editor");
if (ace_el && window.ace && window.ace.edit) {
var editor = window.ace.edit(ace_el);
var annotations = editor.getSession().getAnnotations();
var error_annotations = annotations.filter((annotation) => annotation.type === "error");
if (error_annotations.length > 0) {
var indent = " ";
return new Error(`compile failed:\n${indent}${error_annotations.map(
(annotation) => `${annotation.row}:${annotation.column} ${annotation.text.replace(/\n/g, `\n${indent}`).replace(/\0/g, "")}`
).join(`\n${indent}`)}`);
}
}
// bytebeat - it's not very semantic in the DOM!
var error_message_el = document.querySelector("#controls button[style^='color: rgb(255, 0, 0)']")
if (error_message_el) {
return new Error(`compile failed: ${error_message_el.textContent}`);
}
// TODO: maybe testing the canvas for whether it's blank (after rendering a frame) is expensive enough
// that it should first do a pass just checking that it compiles, and check *at the end* if it's blank,
// and if it's blank then start over but checking also for blankness every time (or bisecting on blankness/boringness)
if (!is_output_canvas_interesting()) {
return new Error("output looks boring / blank");
}
}
var output_canvas = document.querySelector("canvas#demogl, canvas#glcanvas, canvas.playerCanvas, #player canvas, #content canvas, canvas");
var test_canvas = document.createElement("canvas");
var test_ctx = test_canvas.getContext("2d");
test_canvas.width = 10;
test_canvas.height = 10;
var thumbnail_canvas = document.createElement("canvas");
var thumbnail_ctx = thumbnail_canvas.getContext("2d");
thumbnail_canvas.width = 200;
if (output_canvas) {
thumbnail_canvas.height = thumbnail_canvas.width * output_canvas.height / output_canvas.width;
} else {
thumbnail_canvas.height = thumbnail_canvas.width;
}
var num_breeding_slots = 4;
var css = `
#mutagen-ui-container {
font-size: 15px;
position: fixed;
right: 0;
bottom: 0;
width: 100%;
height: 50%;
z-index: 1000;
display: flex;
flex-direction: column;
background: rgba(0, 0, 0, 0.5);
color: white;
/* transform: scale(0.2); */
transform-origin: bottom right;
transition: transform .2s ease;
--thumbnail-width: ${thumbnail_canvas.width}px;
--thumbnail-height: ${thumbnail_canvas.height}px;
}
/*#mutagen-ui-container:hover,
#mutagen-ui-container:focus-within {
transform: scale(1);
}*/
#mutagen-toolbar {
display: flex;
height: 50px;
align-items: center;
}
#mutagen-toolbar button {
height: 30px;
margin-left: 15px;
}
.mutagen-thumbnails-list {
display: grid;
overflow: auto;
grid-template-columns: repeat(auto-fill, var(--thumbnail-width));
grid-gap: 10px;
justify-content: center;
align-content: flex-start;
padding-top: 15px;
padding-bottom: 15px; /* doesn't seem to work - could use margin instead tho if there's an outer container */
}
#mutagen-breeding-box {
grid-template-columns: repeat(4, var(--thumbnail-width));
}
#mutagen-breeding-bar {
display: flex;
}
#mutagen-breeding-actions {
display: flex;
flex-direction: column;
justify-content: center;
}
#mutagen-breeding-actions button {
width: 100px;
height: 50px;
margin-right: 15px;
}
#mutagen-breeding-box {
flex: 1;
}
.mutagen-breeding-slot,
.mutagen-thumbnail {
width: var(--thumbnail-width);
height: var(--thumbnail-height);
}
.mutagen-breeding-slot {
border: 4px dashed gray;
border-radius: 15px;
background: rgba(50, 50, 50, 0.9);
display: flex;
align-items: center;
justify-content: center;
position: relative;
overflow: hidden;
}
@media (max-width: 1050px) {
#mutagen-ui-container {
--thumbnail-width: ${thumbnail_canvas.width * 0.8}px;
--thumbnail-height: ${thumbnail_canvas.height * 0.8}px;
}
}
@media (max-width: 850px) {
#mutagen-ui-container {
--thumbnail-width: ${thumbnail_canvas.width * 0.7}px;
--thumbnail-height: ${thumbnail_canvas.height * 0.7}px;
}
}
@media (max-width: 750px) {
#mutagen-ui-container {
--thumbnail-width: ${thumbnail_canvas.width * 0.6}px;
--thumbnail-height: ${thumbnail_canvas.height * 0.6}px;
}
}
@media (max-width: 650px) {
/*#mutagen-ui-container {
--thumbnail-width: ${thumbnail_canvas.width * 0.5}px;
--thumbnail-height: ${thumbnail_canvas.height * 0.5}px;
}*/
#mutagen-breeding-box {
grid-template-columns: repeat(2, var(--thumbnail-width));
}
}
.mutagen-breeding-slot::before {
/* https://thenounproject.com/term/dna/12357/ */
content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="-0.5 0 48 125"><path d="M35.838 27.603a31.956 31.956 0 003.902-3.329c4.739-4.771 7.246-10.467 7.246-16.471V4.271a4.27 4.27 0 10-8.541 0v.854H8.553v-.854a4.27 4.27 0 10-8.541 0v3.532c0 6.004 2.505 11.7 7.246 16.471 3.991 4.017 9.347 7.12 15.082 8.738 4.279 1.208 8.414 3.59 11.342 6.538 1.741 1.753 3.751 4.407 4.48 7.799H8.837c.357-1.66 1.021-3.143 1.808-4.431h23.13a17.255 17.255 0 00-1.608-1.864c-1.289-1.297-2.837-2.476-4.536-3.474H15.56a26.82 26.82 0 014.802-2.94 37.92 37.92 0 01-9.2-4.44 31.956 31.956 0 00-3.902 3.329C2.517 38.3.012 43.996.012 50c0 6.005 2.505 11.701 7.246 16.473 3.991 4.016 9.347 7.119 15.082 8.737 4.279 1.206 8.414 3.59 11.342 6.537 1.74 1.752 3.747 4.403 4.479 7.791H8.839c.358-1.66 1.022-3.144 1.812-4.43H33.77a16.913 16.913 0 00-1.604-1.856c-1.292-1.302-2.846-2.483-4.551-3.482H15.57a26.888 26.888 0 014.79-2.931 37.993 37.993 0 01-9.2-4.44 31.956 31.956 0 00-3.902 3.329C2.517 80.499.012 86.194.012 92.198v3.532a4.27 4.27 0 108.541 0v-.855h29.894v.855a4.27 4.27 0 008.542 0v-3.532c0-6.004-2.506-11.699-7.246-16.471-3.991-4.017-9.348-7.12-15.081-8.738-4.28-1.207-8.414-3.59-11.342-6.537-1.742-1.753-3.751-4.408-4.48-7.8h29.323c-.356 1.66-1.021 3.144-1.81 4.431H13.224a17.255 17.255 0 001.608 1.864c1.289 1.298 2.838 2.477 4.536 3.474h12.07a26.873 26.873 0 01-4.802 2.939 37.975 37.975 0 019.2 4.44 32.113 32.113 0 003.902-3.328c4.739-4.771 7.246-10.468 7.246-16.473 0-6.004-2.507-11.7-7.246-16.472-3.991-4.016-9.348-7.12-15.081-8.737-4.28-1.207-8.414-3.59-11.342-6.537-1.741-1.752-3.748-4.404-4.479-7.791h29.321c-.357 1.66-1.021 3.143-1.812 4.43h-23.12a17.212 17.212 0 001.604 1.856c1.293 1.301 2.847 2.483 4.551 3.482h12.046a26.945 26.945 0 01-4.791 2.931 37.983 37.983 0 019.203 4.442z"/></svg>');
pointer-events: none;
position: absolute;
left: 50%;
top: 50%;
width: 50px;
height: 100px;
transform: translate(-50%, -50%) scale(0.5);
filter: invert();
opacity: 0.25;
transition: transform 0.2s ease, opacity 0.2s ease;
}
.mutagen-breeding-slot.over {
border-color: #aaa;
}
.mutagen-breeding-slot.over::before {
transform: translate(-50%, -50%) scale(0.7);
opacity: 0.5;
}
.mutagen-breeding-slot .mutagen-thumbnail {
z-index: 1;
}
.mutagen-breeding-slot.over .mutagen-thumbnail {
opacity: 0;
}
#mutagen-thumbnails-container {
flex: 1;
}
.mutagen-thumbnail {
cursor: pointer;
vertical-align: top;
border: 2px dashed transparent;
transition: opacity 0.2s ease;
}
.mutagen-thumbnail.dragging {
opacity: 0.4;
}
#mutagen-ui-container .export-results {
display: inline-block;
}
#mutagen-ui-container .download {
padding: 15px;
display: inline-block;
font-size: 1em;
}
`;
var style = document.createElement("style");
style.id = "mutagen-style";
document.head.appendChild(style);
style.type = "text/css";
style.appendChild(document.createTextNode(css));
var thumbnails = [];
var ui_container = document.createElement("div");
ui_container.id = "mutagen-ui-container";
var toolbar = document.createElement("div");
toolbar.id = "mutagen-toolbar";
var breeding_bar = document.createElement("div");
breeding_bar.id = "mutagen-breeding-bar";
var breeding_actions = document.createElement("div");
breeding_actions.id = "mutagen-breeding-actions";
var breeding_slots_container = document.createElement("div");
breeding_slots_container.id = "mutagen-breeding-box";
breeding_slots_container.className = "mutagen-thumbnails-list";
var thumbnails_container = document.createElement("div");
thumbnails_container.id = "mutagen-thumbnails-container";
thumbnails_container.className = "mutagen-thumbnails-list";
breeding_bar.appendChild(breeding_slots_container);
breeding_bar.appendChild(breeding_actions);
ui_container.appendChild(toolbar);
ui_container.appendChild(breeding_bar);
ui_container.appendChild(thumbnails_container);
document.body.appendChild(ui_container);
// if (existing_thumbnails_container) {
// Array.from(existing_thumbnails_container.querySelectorAll(".mutagen-thumbnail")).forEach((thumbnail_img)=> {
// add_thumbnail(thumbnail_img.dataset.code, thumbnail_img.src);
// });
// }
// if (existing_ui_container) {
// existing_ui_container.remove();
// }
ui_container.addEventListener("click", (event) => {
if (!event.target.classList.contains("mutagen-thumbnail")) {
return;
}
var thumbnail_img = event.target;
try {
window.mutagen_stop();
} catch (e) { }
set_code_on_page(thumbnail_img.dataset.code);
compile_code_on_page();
});
thumbnails_container.addEventListener("dblclick", (event) => {
if (!event.target.classList.contains("mutagen-thumbnail")) {
return;
}
var thumbnail_img = event.target;
try {
window.mutagen_stop();
} catch (e) { }
set_code_on_page(thumbnail_img.dataset.code);
mutate_code_on_page();
});
var dragging_el = null;
function record_thumbnail() {
if (!output_canvas) {
return;
}
var code = get_code_from_page();
if (thumbnails.some((el) => el.dataset.code === code)) {
return;
}
add_thumbnail(code);
}
function add_thumbnail(code, img_src) {
var thumbnail_img = document.createElement("img");
thumbnail_img.className = "mutagen-thumbnail";
if (img_src) {
thumbnail_img.src = img_src
} else {
thumbnail_ctx.clearRect(0, 0, thumbnail_canvas.width, thumbnail_canvas.height);
if (window.draw) {
window.draw(); // shaderoo (webgl context without preserveDrawingBuffer needs to be rerendered to get image data from it)
}
thumbnail_ctx.drawImage(output_canvas, 0, 0, thumbnail_canvas.width, thumbnail_canvas.height);
thumbnail_img.src = thumbnail_canvas.toDataURL();
}
thumbnail_img.width = thumbnail_canvas.width;
thumbnail_img.height = thumbnail_canvas.height;
thumbnail_img.dataset.code = code;
thumbnail_img.tabIndex = 0;
// thumbnail_img.setAttribute("role", "button");
thumbnails_container.appendChild(thumbnail_img);
thumbnail_img.setAttribute("draggable", "draggable"); // probably not necessary since it happens to be an img
thumbnails.push(thumbnail_img);
invalidate_export_links();
}
document.addEventListener("dragstart", (event) => {
var thumbnail_img = event.target.closest(".mutagen-thumbnail");
// var slot = event.target.closest(".mutagen-breeding-slot");
if (!thumbnail_img) {
return;
}
event.dataTransfer.dropEffect = "copy";
event.dataTransfer.setData('text/plain', thumbnail_img.dataset.code);
thumbnail_img.classList.add("dragging");
dragging_el = thumbnail_img;
});
document.addEventListener("dragend", (event) => {
Array.from(document.querySelectorAll(".mutagen-breeding-slot, .mutagen-thumbnail")).forEach((el) => {
el.classList.remove("over");
el.classList.remove("dragging");
});
dragging_el = null; // (drop comes before dragend)
});
document.addEventListener("dragover", (event) => {
var slot = event.target.closest(".mutagen-breeding-slot");
if (!slot) {
return;
}
event.preventDefault();
return false;
});
document.addEventListener("dragenter", (event) => {
if (!dragging_el) {
return;
}
var slot = event.target.closest(".mutagen-breeding-slot");
if (!slot) {
return;
}
slot.classList.add("over");
});
document.addEventListener("dragleave", (event) => {
var slot = event.target.closest(".mutagen-breeding-slot");
if (!slot) {
return;
}
if (!event.relatedTarget) {
// ...not sure what to do here, not sure when this happens
console.log("no event.relatedTarget during dragleave", event);
return;
}
if (event.relatedTarget.closest(".mutagen-breeding-slot") !== slot) {
slot.classList.remove("over");
}
});
document.addEventListener("drop", (event) => {
var slot = event.target.closest(".mutagen-breeding-slot");
if (!slot) {
return;
}
event.stopPropagation();
if (!dragging_el) {
return;
}
slot.innerHTML = "";
var thumbnail_clone = dragging_el.cloneNode();
slot.appendChild(thumbnail_clone);
return false;
});
function make_breeding_slot() {
var slot = document.createElement("div");
slot.className = "mutagen-breeding-slot";
return slot;
}
var breeding_slots = [];
for (let i = 0; i < num_breeding_slots; i++) {
let slot = make_breeding_slot();
breeding_slots_container.appendChild(slot);
breeding_slots.push(slot);
}
function is_output_canvas_interesting() {
if (!output_canvas) {
return true;
}
if (window.draw) {
window.draw(); // shaderoo (webgl context without preserveDrawingBuffer needs to be rerendered to get image data from it)
}
test_ctx.clearRect(0, 0, test_canvas.width, test_canvas.height);
test_ctx.drawImage(output_canvas, 0, 0, test_canvas.width, test_canvas.height);
var image_data = test_ctx.getImageData(0, 0, test_canvas.width, test_canvas.height);
var { data } = image_data;
// TODO: test for maybe 40% of any of four sides being blank
// and actually give a scalar fitness rating
// TODO: make it more perceptual in the color difference, i.e. treating similar brightnesses more similarly
// and maybe don't look at the very edges because just a vignette isn't very interesting
var [r, g, b] = data;
var threshold = 25;
var interesting = false;
for (var i = 0; i < data.length; i += 4) {
var diff =
Math.abs(data[i + 0] - r) +
Math.abs(data[i + 1] - g) +
Math.abs(data[i + 2] - b);
if (diff > threshold) {
interesting = true;
}
}
return interesting;
}
function is_compiling() {
// shadertoy
var compile_status_el = document.querySelector("#compilationTime");
if (compile_status_el) {
return compile_status_el.textContent.match(/Compiling/i);
}
// bytebeat
if ((location.origin + location.pathname).match(/bytebeat/i)) {
return false; // bytebeat compiles synchronously
}
return false;
}
function compile_code_on_page() {
var compile_button = document.querySelector("[title~='Compile'], #applyButton, #run"); // shadertoy, shaderoo, jsfiddle
if (compile_button) {
compile_button.click();
} else if (window.compile) {
window.compile(get_code_from_page()); // bytebeat
}
return new Promise((resolve, reject) => {
function wait_for_compile_end() {
if (is_compiling()) {
setTimeout(wait_for_compile_end, 50);
} else {
setTimeout(() => { // may not be needed!
var error = find_problem_in_output_on_page();
if (error) { reject(error); } else { resolve(); }
}, 5);
}
}
wait_for_compile_end();
});
}
function generate_edits(doc) {
var edit_points = doc.filter((part) => typeof part !== "string");
var mutation_chance = 0.01 + (0.5 / edit_points.length);
var min_edits = 5;
var max_tries_to_reach_min_edits = 50;
var tries_to_reach_min_edits = 0;
var edits;
do {
edits = [];
for (var i = 0; i < doc.length; i++) {
var part = doc[i];
if (part.type === "number_literal") {
var mutated_number_literal = mutate_number_literal(part.text, mutation_chance);
if (mutated_number_literal !== part.text) {
edits.push({
index_in_doc: i,
text: mutated_number_literal,
_original_text: part.text, // for debug
_from_part: part, // for debug
});
}
}
}
tries_to_reach_min_edits++;
mutation_chance *= 1.5;
// console.log(`${edits.length} possible edits`);
} while (tries_to_reach_min_edits < max_tries_to_reach_min_edits && edits.length < min_edits);
// console.log(`${edits.length} possible edits in ${tries_to_reach_min_edits} tries`);
return edits;
}
// TODO: weighted random chances
function generate_edits_by_breeding(base_doc, docs, weights) {
// make edits for every edit point
// It might be good in the future to apply only needed edits in CodeMirror & Ace editors,
// but for now it doesn't matter if we create "edits" where the docs actually match.
// TODO: throw?
console.assert(docs.length === weights.length, "number of docs and weights must match");
var doc_length = docs[0].length;
for (const doc of docs) {
console.assert(doc.length === doc_length, "doc lengths should match");
}
var edits = [];
for (var i = 0; i < base_doc.length; i++) {
var base_part = base_doc[i];
var part_options = docs.map((doc) => doc[i]);
// Note: parts can be strings or edit point objects
for (const part of part_options) {
console.assert(part.type === base_part.type, "part types should match");
}
if (base_part.type === "number_literal") {
var part = part_options[Math.floor(Math.random() * part_options.length)];
edits.push({
index_in_doc: i,
text: part.text,
_part_chosen: part, // for debug
_part_options: part_options, // for debug
});
}
}
// console.log("breeding edits:", edits);
return edits;
}
var choose = (array) => array[~~(array.length * Math.random())];
var logo_canvas = document.createElement("canvas");
var logo_ctx = logo_canvas.getContext("2d");
logo_canvas.width = 100;
logo_canvas.height = 10;
// for debug
if (window.mutagen_debug_logo) {
logo_canvas.id = "mutagen-logo-canvas-debug";
document.body.appendChild(logo_canvas);
logo_canvas.style.position = "absolute";
logo_canvas.style.left = "0";
logo_canvas.style.top = "0";
logo_canvas.style.transform = "scale(10)";
logo_canvas.style.transformOrigin = "top left";
logo_canvas.style.imageRendering = "crisp-edges";
logo_canvas.style.imageRendering = "pixelated";
logo_canvas.style.background = "rgba(0, 0, 0, 1)";
}
function draw_logo() {
logo_ctx.clearRect(0, 0, logo_canvas.width, logo_canvas.height);
// logo_ctx.fillRect(0, 0, 5, 5);
logo_ctx.save();
logo_ctx.scale(logo_canvas.height, logo_canvas.height);
logo_ctx.translate(0.5, 0.5);
logo_ctx.scale(0.7, 0.7);
logo_ctx.translate(-0.5, -0.5);
var letter_spacing = 0.5;
var m_slantedness = Math.random() * 0.8;
var m_width = 1.4 + m_slantedness * 0.8;
var a_roundedness = 1 - Math.random() * 0.6;
var letter_data = [
{
letter: "M",
points: [
[0, 1],
[0.25 * m_slantedness * m_width, 0],
[0.5 * m_width, 1 - Math.random() * 0.25],
[(1 - 0.25 * m_slantedness) * m_width, 0],
[1 * m_width, 1],
],
width: m_width,
kern_after: -m_slantedness * 0.2,
},
{
letter: "U",
points: [
[0, 0],
[0, 0.5],
[0.2, 0.8],
[0.5, 1],
[0.8, 0.8],
[1, 0.5],
[1, 0],
],
kern_after: -0.15,
},
{
letter: "T",
points: [
[0, 0],
[1, 0],
[0.5, 0],
[0.5, 1],
],
kern_after: -0.3,
},
{
letter: "A",
strokes: [
[
[0, 1],
[0 + (1 / 8 - a_roundedness * 0.2), 3 / 4],
[0 + (1 / 4 - a_roundedness * 0.25), 1 / 2],
[0 + (3 / 8 - a_roundedness * 0.3), 1 / 4 * (1 - a_roundedness / 2)],
[0.5, 0],
[1 - (3 / 8 - a_roundedness * 0.3), 1 / 4 * (1 - a_roundedness / 2)],
[1 - (1 / 4 - a_roundedness * 0.25), 1 / 2],
[1 - (1 / 8 - a_roundedness * 0.2), 3 / 4],
[1, 1],
],
[
[0.2 - Math.random() * 0.2, 0.75 - a_roundedness * 0.2],
[0.8 + Math.random() * 0.2, 0.75 - a_roundedness * 0.2],
]
],
kern_after: -0.15,
},
{
letter: "G",
points: [
[0.9, 0.01],
[0.5, 0],
[0.4, 0.1],
[0.2, 0.4],
[0, 0.5],
[0.2, 0.7],
[0.5, 1],
[0.7, 0.9],
[1, 0.7],
[1, 0.5],
[0.6, 0.5],
],
},
{
letter: "E",
points: [
[1, 0],
[0, 0],
[0, 0.5],
[0.7, 0.5],
[0, 0.5],
[0, 1],
[1, 1],
],
},
{
letter: "N",
points: [
[0, 1],
[0, 0],
[1, 1],
[1, 0],
],
},
];
var rand = Math.random();
var rand2 = Math.random();
var lw_inc = 0;
for (var letter of letter_data) {
var { points, strokes, width, kern_after } = letter;
width = width || 1;
kern_after = kern_after || 0;
strokes = strokes || [points];
var letter_width_scale = 1 + Math.random() * 0.4;
var letter_width = width * letter_width_scale;
logo_ctx.save();
logo_ctx.scale(letter_width_scale, 1);
// TODO: increase letter spacing around rotated letters
var rotation = (Math.random() - 1 / 2) * 0.2;
logo_ctx.rotate(rotation);
for (var stroke_i = 0; stroke_i < strokes.length; stroke_i++) {
var points = strokes[stroke_i];
for (var i = 0; i < points.length - 1; i++) {
var a = points[i];
var b = points[i + 1];
a.x += Math.random() * 0.05;
a.y += Math.random() * 0.05;
b.x += Math.random() * 0.05;
b.y += Math.random() * 0.05;
logo_ctx.beginPath();
logo_ctx.moveTo(a[0], a[1]);
logo_ctx.lineTo(b[0], b[1]);
lw_inc += Math.random();
logo_ctx.lineWidth = 0.04 + Math.max(0, 0.1 * Math.sin(lw_inc / 5 * rand2 + rand * 5) * Math.sin(lw_inc / 50 + rand * 19));
logo_ctx.strokeStyle = "white";
logo_ctx.stroke();
}
}
logo_ctx.restore();
logo_ctx.translate(letter_width + letter_spacing + kern_after, 0);
}
logo_ctx.restore();
var chars = " βββββββββββββββ"; // semantically pure, but not monospace
// var chars = "βββββββββββββ
βββ"; // actually monospace, but wider than a space
// var chars = " βββββ"; // good, monospace, normal space sized characters
var image_data = logo_ctx.getImageData(0, 0, logo_canvas.width, logo_canvas.height);
var at = (x, y) =>
(image_data.data[
((y * image_data.width) + x) * 4 + 3
] / 256) > 0.1;
console.assert(logo_canvas.width % 2 === 0, "we're assuming an even number of pixels for accessing image data");
console.assert(logo_canvas.height % 2 === 0, "we're assuming an even number of pixels for accessing image data");
var grid = [];
for (var y = 0; y < logo_canvas.height; y += 2) {
var row = [];
for (var x = 0; x < logo_canvas.width; x += 2) {
var upper_left = at(x, y);
var upper_right = at(x + 1, y);
var lower_left = at(x, y + 1);
var lower_right = at(x + 1, y + 1);
var char = chars[0 + upper_left + upper_right * 2 + lower_left * 4 + lower_right * 8];
row.push(char);
}
grid.push(row);
}
// add some particles...
grid.forEach((row, row_index) => {
row.forEach((char, char_index) => {
if (char !== " ") {
if (Math.random() < 0.5) {
var particle_char = choose("Β·.β’βͺ");
var x = char_index + choose([-2, -1, -1, 0, 1, 1, 2]);
var y = row_index + choose([-2, -1, -1, 0, 1, 1, 2]);
if (y >= 0 && x >= 0 && y < grid.length && x < grid[y].length) {
if (grid[y][x] === " ") {
grid[y][x] = particle_char;
}
}
}
}
});
});
var logo = grid.map((row) => row.join("")).join("\n");
// substitute block element characters that aren't rendered as fixed width by CodeMirror
// with simpler shapes that are rendered the same width as a space
var ch_top = "β";
var ch_bottom = "β";
var ch_left = "β";
var ch_right = "β";
var ch_full = "β";
logo = logo
.replace(/β/g, () => choose([ch_left, ch_top]))
.replace(/β/g, () => choose([ch_right, ch_top]))
.replace(/β/g, () => choose([ch_right, ch_bottom]))
.replace(/β/g, () => choose([ch_left, ch_bottom]))
.replace(/[ββββββ]/g, ch_full);
return logo;
}
var attribution_header_start = `// Based on`;
var attribution_header_end = `code mutation tool by Isaiah Odhner)`;
function get_attribution_header() {
// TODO: handle shaders being edited (don't say "Based on" I suppose? get name title from input)
var title_el = document.querySelector("#shaderTitle, #shaderName, [name='title'], #title, title"); // shadertoy, shaderoo, jsfiddle, (speculative), (fallback to page title)
var author_name_el = document.querySelector("#shaderAuthorName, a[href*='username=']"); // shadertoy, shaderoo
var author_date_el = document.querySelector("#shaderAuthorDate"); // shadertoy
var title = title_el && title_el.textContent;
var author_name = author_name_el && author_name_el.textContent;
var author_date = author_date_el && author_date_el.textContent;
var author_year = author_date && author_date.replace(/-.*/, "");
if (title && author_name && author_year) {
var based_on = `Based on "${title}" by ${author_name} - ${author_year}
${location.href}`;
} else {
var based_on = `Based on:
${location.href}`;
}
// var logo = `
// β’ β β Β·. ββ’ βββββββ βββΒ· ββ β’ βββ . β β
// Β·ββ βββββͺββͺββββ’ββ ββ ββ ββ β βͺββ.βΒ·β’ββββ
// ββ βββββΒ·βββββ ββ.βͺβββββ ββ βββββββͺββββββ
// ββ βββββββββββ βββΒ·ββ βͺββββββͺββββββββββββ
// ββ ββͺβββ βββ βββ β β Β·ββββ βββ ββ ββͺ
// `;
// logo = logo.replace(/[Β·.β’βͺ]/g, ()=> choose("Β·.β’βͺ"));
var logo = draw_logo();
var header = `${based_on}
randomly mutated with...
${logo}
https://github.com/multiism/mutagen
(MUTAGEN, code mutation tool by Isaiah Odhner)`;
var line_comment_token = "//";
header = header.replace(/(^|\n)/g, `$1${line_comment_token} `).split("\n").map((line) => line.trimEnd()).join("\n");
console.assert(header.indexOf(attribution_header_start) === 0, "attribution_header_start didn't match at start of header");
console.assert(header.indexOf(attribution_header_end) === header.length - attribution_header_end.length, "attribution_header_end didn't match at end of header");
return header;
}
function add_or_replace_attribution_header(code) {
var header = get_attribution_header();
code = remove_attribution_header(code);
// this is pretty silly trying to be language-agnostic here
// (if we're gonna handle other languages that have e.g. # for comments, we'll already need to change/disable the header)
// (and alternatively we could detect the language when adding support for coffeescript and python and all that)
// but -- = lua, # = coffeescript, python, avoiding matching preprocessor directives
var next_is_comment = code.match(/^\s*(\/[/*]|--|#(?!if|define|pragma|extension|include|version|error))/);
var newlines = next_is_comment ? "\n\n\n\n\n" : "\n\n\n";
code = header + newlines + code.replace(/^\s*\n/, "");
return code;
}
function remove_attribution_header(code) {
var header_start_index = code.indexOf(attribution_header_start);
var end_start_index = code.indexOf(attribution_header_end);