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<!DOCTYPE html><html lang="en-US"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] 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/*!
* Marp / Marpit Gaia theme.
*
* @theme gaia
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
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class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-background-color="#eee8e9" data-theme="gaia" lang="en-US" style="--background-color:#eee8e9;--theme:gaia;background-color:#eee8e9;background-image:none;">
<h1 id="3d-web-app-creation"><strong>3D Web App Creation</strong></h1>
<p>Fivos Doganis<br />
<a href="mailto:fivos.doganis@gmail.com">fivos.doganis@gmail.com</a></p>
<iframe frameborder="0" scrolling="no" marginheight="0" marginwidth="0" allowfullscreen style=
"position: absolute;
padding-top: 0px;
padding-left: 0px;
margin-top: 0px;
margin-left: 0px;
top: 0px;
bottom: 0px;
left: 0px;
right: 0px;
width: 100%;
height: 100%;
border: 0;
overflow: hidden;
pointer-events: none;
z-index: -1" srcdoc ="
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<video width='1440' height='900' autoplay muted loop>
<source src='https://cdn.epic.net/uploads/2022/07/epic-moments_of_happiness-chill_the_lion-loop-ld.mp4' type='video/mp4'>
<img src='https://cdn.dribbble.com/users/2813/screenshots/2123957/media/984bf5be1f6853bac7a9b9f110e9cc9a.gif'
</video>
</body>
</html>" >
</iframe>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-theme="gaia" lang="en-US" style="--theme:gaia;">
<h2 id="contents">Contents</h2>
<ul>
<li><img class="emoji" draggable="false" alt="➡️" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/27a1.svg" data-marp-twemoji=""/> <a href="#16"><strong>WebGL</strong></a>
<ul>
<li><a href="#22">Basic</a>, <a href="#62">Advanced</a></li>
<li><a href="#67">Optimizations</a>, <a href="#73">Shaders</a></li>
<li><a href="#79">Other APIs</a>, <a href="#80">WebAssembly</a></li>
</ul>
</li>
<li><img class="emoji" draggable="false" alt="➡️" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/27a1.svg" data-marp-twemoji=""/> <a href="#88"><strong>THREE.js</strong></a>
<ul>
<li><a href="#91">Theory</a></li>
<li><a href="#97">Setup</a></li>
<li><a href="#109">Basic</a>, <a href="#111">Advanced</a>, <a href="#117">Physics</a>, <a href="#118">3D Models</a>, <a href="#119">Editor</a></li>
<li><a href="#123">Projects</a>, <a href="#133">Wrappers</a></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-footer="cover art : "Chill the lion" by Karim Maaloul https://codepen.io/Yakudoo/details/YXxmYR/" data-theme="gaia" lang="en-US" style="--footer:cover art : "Chill the lion" by Karim Maaloul https://codepen.io/Yakudoo/details/YXxmYR/;--theme:gaia;">
<h1 id="why-use-web-technologies-for-3d">Why use Web technologies for 3D?</h1>
<ul>
<li><strong>mobile</strong> experiences</li>
<li><strong>open</strong> technology stack
<ul>
<li><strong>cross-platform</strong>, no installation, no app store</li>
<li>open source</li>
<li><strong>non-proprietary</strong> (unlike Unity or Unreal Engine)</li>
<li><strong>free</strong></li>
</ul>
</li>
<li>leverage many other existing web APIs</li>
</ul>
<footer>cover art : "Chill the lion" by Karim Maaloul <a href="https://codepen.io/Yakudoo/details/YXxmYR/">https://codepen.io/Yakudoo/details/YXxmYR/</a></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="4" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="steps">Steps</h1>
<ul>
<li>Run</li>
<li>Debug</li>
<li>Build</li>
<li>Modify</li>
<li>Create</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="5" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="run-check-your-drivers">Run: check your drivers</h1>
<ul>
<li>Update your graphics card drivers if possible</li>
<li><strong>Linux</strong>: if your GPU is not properly detected, <a href="https://askubuntu.com/questions/206283/how-can-i-uninstall-a-nvidia-driver-completely#206289">uninstall NVIDIA drivers</a> and use the default ones provided by Ubuntu</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-bash">sudo apt-get remove --purge <span class="hljs-string">'^nvidia-.*'</span>
sudo apt-get install ubuntu-desktop
sudo <span class="hljs-built_in">rm</span> /etc/X11/xorg.conf
<span class="hljs-built_in">echo</span> <span class="hljs-string">'nouveau'</span> | sudo <span class="hljs-built_in">tee</span> -a /etc/modules
reboot
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="6" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="run-testing-on-your-mobile">Run: testing on your mobile</h1>
<ul>
<li>Check that your smartphone can read <a href="https://en.wikipedia.org/wiki/QR_code">QR codes</a></li>
<li>iOS : default Camera app</li>
<li>Android
<ul>
<li>use Google Chrome + scan button</li>
<li>or install a <strong>trustworthy</strong> QR code scanning app like <strong><a href="https://play.google.com/store/apps/details?id=com.trendmicro.qrscan">Trend Micro</a></strong></li>
</ul>
</li>
<li>Other 100% web based alternatives
<ul>
<li>webqr.com</li>
<li>qrcodescan.in</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="7" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="debug">Debug</h1>
<ul>
<li>There will be bugs :) <img class="emoji" draggable="false" alt="🐛" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f41b.svg" data-marp-twemoji=""/></li>
<li>F12</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/debugger"><code>debugger</code> statement</a></li>
<li>Tips:
<ul>
<li><a href="https://webglfundamentals.org/webgl/lessons/webgl-setup-and-installation.html">https://webglfundamentals.org/webgl/lessons/webgl-setup-and-installation.html</a></li>
<li><a href="https://threejs.org/manual/en/debugging-javascript.html">https://threejs.org/manual/en/debugging-javascript.html</a></li>
<li><a href="https://www.khronos.org/webgl/wiki/Debugging">https://www.khronos.org/webgl/wiki/Debugging</a></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="8" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="build-tools">Build: tools</h1>
<ul>
<li>
<p>Web development</p>
<ul>
<li>browser (Firefox, Chrome, Safari Mobile)</li>
<li>Git (optional yet extremely useful)</li>
<li>editor (VSCode), or <a href="https://glitch.com/">Glitch</a> (slow, but no installation needed!)</li>
</ul>
</li>
<li>
<p>Technologies: HTML, JS, CSS, WebGL, THREE.js</p>
</li>
<li>
<p>Optional:</p>
<ul>
<li>OpenStreetMap, OpenLayers, CesiumJS, <a href="https://geoservices.ign.fr/documentation/diffusion/telechargement-donnees-libres.html">Géoservices IGN</a></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="9" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="browser-installation">Browser installation</h1>
<ul>
<li>Firefox installed by default
<ul>
<li>should be enough!</li>
</ul>
</li>
<li>Chrome
<ul>
<li>to test compatibility as well as some special features</li>
<li>install latest version (97+) on mobile</li>
<li>you may install Chromium on your desktop
<ul>
<li>open-source without proprietary services</li>
</ul>
</li>
</ul>
</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-bash">sudo apt-get install chromium-browser
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="10" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="git-installation">Git installation</h1>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>sudo apt-get install git
git config --global user.name "myusername"
git config --global user.email myname@mymailprovider.com
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="11" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="vscode-installation"><a href="https://linuxize.com/post/how-to-install-visual-studio-code-on-ubuntu-18-04/">VSCode installation</a></h1>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-bash">sudo apt update
sudo apt install software-properties-common apt-transport-https wget
wget -q https://packages.microsoft.com/keys/microsoft.asc -O- | sudo apt-key add -
sudo add-apt-repository <span class="hljs-string">"deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main"</span>
sudo apt install code
</code></pre>
<p><a href="https://unix.stackexchange.com/questions/452020/">Remove GPG warnings</a></p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>sudo gpgconf --kill dirmngr
sudo chown -R $USER:$USER ~/.gnupg
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="12" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="customization">Customization</h1>
<ul>
<li>Avoid blinking UI by changing the following setting:</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-bash"><span class="hljs-built_in">set</span> window.titleBarStyle to custom
</code></pre>
<ul>
<li>Recommended extensions
<ul>
<li><a href="https://marketplace.visualstudio.com/items?itemName=ritwickdey.LiveServer">Live Server</a> of <a href="https://marketplace.visualstudio.com/items?itemName=ms-vscode.live-server">Live Preview</a> (we'll see other alternatives)</li>
<li><a href="https://marketplace.visualstudio.com/items?itemName=mhutchie.git-graph"><strong>Git Graph</strong></a></li>
<li><a href="https://marketplace.visualstudio.com/items?itemName=cesium.gltf-vscode"><strong>glTF Tools</strong></a></li>
<li><a href="https://github.com/racz16/WebGL-GLSL-Editor">WebGL GLSL Editor</a>,</li>
<li><a href="https://marketplace.visualstudio.com/items?itemName=circledev.glsl-canvas">glsl-canvas</a></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-class="invert" data-background-color="black" data-theme="gaia" lang="en-US" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--background-color:black;--theme:gaia;background-color:black;background-image:none;" data-marpit-pagination-total="138" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("https://i.stack.imgur.com/H8fpQ.png");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-class="invert" data-background-color="black" data-theme="gaia" lang="en-US" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--background-color:black;--theme:gaia;background-color:black;background-image:none;" data-marpit-pagination-total="138" data-marpit-advanced-background="content">
<ul>
<li>File > Settings > Format on Save <img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/2b50.svg" data-marp-twemoji=""/></li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-paginate="true" data-class="invert" data-background-color="black" data-theme="gaia" lang="en-US" class="invert" data-marpit-pagination="13" style="" data-marpit-pagination-total="138" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="14" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="development-environment-setup">Development environment setup</h1>
<ul>
<li>Files cannot be loaded from disk without a user action</li>
<li><strong>CORS</strong>: <a href="https://developer.mozilla.org/fr/docs/Web/HTTP/CORS">Cross Origin Resource Sharing</a>
<ul>
<li>one of the many web browser security measures</li>
</ul>
</li>
</ul>
<p><img class="emoji" draggable="false" alt="➡️" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/27a1.svg" data-marp-twemoji=""/> need to run a server like <a href="https://marketplace.visualstudio.com/items?itemName=ritwickdey.LiveServer">Live Server</a>, or:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-shell"><span class="hljs-meta prompt_">$ </span><span class="language-bash"><span class="hljs-built_in">cd</span> /home/somedir</span>
<span class="hljs-meta prompt_">$ </span><span class="language-bash">python -m SimpleHTTPServer</span>
</code></pre>
<p>And then point your browser at <code>http://localhost:8000</code></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="15" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="glitch-online-interactive-editor">Glitch: online interactive editor</h1>
<p><img src="https://aws1.discourse-cdn.com/business6/uploads/glitch/original/2X/6/63bf00cd3adcc2f2d9ee808d52941634f26e01bc.png" alt="" /></p>
<ul>
<li><a href="https://glitch.com/">https://glitch.com/</a></li>
<li><a href="https://glitch.com/~threejs">THREE.js example</a></li>
</ul>
<p>But also <a href="https://vscode.dev">VSCode.dev</a>, Codepen.io, Repl.it etc.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-class="invert lead" data-theme="gaia" lang="en-US" class="invert lead" data-marpit-pagination="16" style="--paginate:true;--class:invert lead;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="webgl-exercices">WebGL Exercices</h1>
<p>inspired by</p>
<ul>
<li><a href="http://www.webglacademy.com">webglacademy</a></li>
<li><a href="https://webglfundamentals.org">webglfundamentals</a> <img class="emoji" draggable="false" alt="⭐" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/2b50.svg" data-marp-twemoji=""/></li>
<li><a href="https://webgl2fundamentals.org">webgl2fundamentals</a></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="17" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="check-that-webgl-is-supported">Check that WebGL is supported</h1>
<ul>
<li><a href="https://caniuse.com/webgl">https://caniuse.com/webgl</a></li>
<li><a href="https://webglreport.com/">https://webglreport.com/</a></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="18" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<p><strong>Reminder</strong>: Minimalistic web page</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-html"><span class="hljs-meta"><!DOCTYPE <span class="hljs-keyword">html</span>></span>
<span class="hljs-tag"><<span class="hljs-name">html</span>></span>
<span class="hljs-tag"><<span class="hljs-name">head</span>></span>
<span class="hljs-tag"><<span class="hljs-name">meta</span> <span class="hljs-attr">charset</span>=<span class="hljs-string">'utf-8'</span>></span>
<span class="hljs-tag"></<span class="hljs-name">head</span>></span>
<span class="hljs-tag"><<span class="hljs-name">body</span>></span>
<span class="hljs-tag"></<span class="hljs-name">body</span>></span>
<span class="hljs-tag"></<span class="hljs-name">html</span>></span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="19" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<p><strong>Reminder</strong>: Minimalistic drawing program using the <strong><a href="https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API">Canvas</a></strong> API</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-html"><span class="hljs-meta"><!DOCTYPE <span class="hljs-keyword">html</span>></span>
<span class="hljs-tag"><<span class="hljs-name">html</span>></span>
<span class="hljs-tag"><<span class="hljs-name">head</span>></span>
<span class="hljs-tag"><<span class="hljs-name">meta</span> <span class="hljs-attr">charset</span>=<span class="hljs-string">'utf-8'</span>></span>
<span class="hljs-tag"></<span class="hljs-name">head</span>></span>
<span class="hljs-tag"><<span class="hljs-name">body</span>></span>
<span class="hljs-tag"><<span class="hljs-name">canvas</span> <span class="hljs-attr">width</span>=<span class="hljs-string">'640'</span> <span class="hljs-attr">height</span>=<span class="hljs-string">'480'</span>></span><span class="hljs-tag"></<span class="hljs-name">canvas</span>></span>
<span class="hljs-tag"><<span class="hljs-name">script</span>></span><span class="language-javascript">
<span class="hljs-keyword">const</span> canvas = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'canvas'</span>);
<span class="hljs-keyword">const</span> ctx = canvas.<span class="hljs-title function_">getContext</span>(<span class="hljs-string">'2d'</span>); <span class="hljs-comment">// get 2D rendering context, on which we'll draw</span>
ctx.<span class="hljs-property">fillStyle</span> = <span class="hljs-string">'rgba(255, 0, 0, 1)'</span>; <span class="hljs-comment">// a.k.a. 'red': opaque red</span>
ctx.<span class="hljs-title function_">fillRect</span>(<span class="hljs-number">0</span>, <span class="hljs-number">0</span>, canvas.<span class="hljs-property">width</span>, canvas.<span class="hljs-property">height</span>); <span class="hljs-comment">// uses current color</span>
</span><span class="hljs-tag"></<span class="hljs-name">script</span>></span>
<span class="hljs-tag"></<span class="hljs-name">body</span>></span>
<span class="hljs-tag"></<span class="hljs-name">html</span>></span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-theme="gaia" lang="en-US" style="--theme:gaia;"><iframe style=
"position: absolute;
top: 110px;
bottom: 110px;
left: 320px;
right: 320px;
width:100%;
height: 100%;
border: 0;" srcdoc ="
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<canvas width='640' height='480'></canvas>
<script>
const canvas = document.querySelector('canvas');
const ctx = canvas.getContext('2d');
ctx.fillStyle = 'rgba(255, 0, 0, 1)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
</script>
</body>
</html>" >
</iframe>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-class="invert" data-theme="gaia" lang="en-US" class="invert" data-marpit-pagination="21" style="--paginate:true;--class:invert;--theme:gaia;" data-marpit-pagination-total="138" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("https://brunoimbrizi.github.io/webexpo-2016/dist/img/history-05.gif");"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="21" data-paginate="true" data-class="invert" data-theme="gaia" lang="en-US" class="invert" data-marpit-pagination="21" style="--paginate:true;--class:invert;--theme:gaia;" data-marpit-pagination-total="138" data-marpit-advanced-background="content">
<h1 id="there-is-also-canvas"><a href="https://brunoimbrizi.github.io/webexpo-2016/dist/">"There Is Also Canvas"</a></h1>
<h2 id="bruno-imbrizi">Bruno Imbrizi</h2>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-paginate="true" data-class="invert" data-theme="gaia" lang="en-US" class="invert" data-marpit-pagination="21" style="" data-marpit-pagination-total="138" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="22" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<p><strong>Minimalistic WebGL program</strong>: to ensure that everything works fine<br />
<img class="emoji" draggable="false" alt="⚠️" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/26a0.svg" data-marp-twemoji=""/> <strong>no error checks</strong>, for clarity reasons (<em>don't do this at home!</em> <img class="emoji" draggable="false" alt="😉" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f609.svg" data-marp-twemoji=""/>)</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-html"><span class="hljs-meta"><!DOCTYPE <span class="hljs-keyword">html</span>></span>
<span class="hljs-tag"><<span class="hljs-name">html</span>></span>
<span class="hljs-tag"><<span class="hljs-name">head</span>></span>
<span class="hljs-tag"><<span class="hljs-name">meta</span> <span class="hljs-attr">charset</span>=<span class="hljs-string">'utf-8'</span>></span>
<span class="hljs-tag"></<span class="hljs-name">head</span>></span>
<span class="hljs-tag"><<span class="hljs-name">body</span>></span>
<span class="hljs-tag"><<span class="hljs-name">canvas</span> <span class="hljs-attr">width</span>=<span class="hljs-string">'640'</span> <span class="hljs-attr">height</span>=<span class="hljs-string">'480'</span>></span><span class="hljs-tag"></<span class="hljs-name">canvas</span>></span>
<span class="hljs-tag"><<span class="hljs-name">script</span>></span><span class="language-javascript">
<span class="hljs-keyword">const</span> canvas = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'canvas'</span>);
<span class="hljs-comment">/** <span class="hljs-doctag">@type</span> {<span class="hljs-type">WebGLRenderingContext</span>} */</span>
<span class="hljs-keyword">const</span> gl = canvas.<span class="hljs-title function_">getContext</span>(<span class="hljs-string">'webgl'</span>); <span class="hljs-comment">// instead of '2d'</span>
gl.<span class="hljs-title function_">clearColor</span>(<span class="hljs-number">1.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">1.</span>); <span class="hljs-comment">// RGBA: opaque red</span>
gl.<span class="hljs-title function_">clear</span>(gl.<span class="hljs-property">COLOR_BUFFER_BIT</span>); <span class="hljs-comment">// uses current color (state machine)</span>
</span><span class="hljs-tag"></<span class="hljs-name">script</span>></span>
<span class="hljs-tag"></<span class="hljs-name">body</span>></span>
<span class="hljs-tag"></<span class="hljs-name">html</span>></span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="23" data-theme="gaia" lang="en-US" style="--theme:gaia;"><iframe style=
"position: absolute;
top: 110px;
bottom: 110px;
left: 320px;
right: 320px;
width:100%;
height: 100%;
border: 0;" srcdoc ="
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<canvas width='640' height='480'></canvas>
<script>
const canvas = document.querySelector('canvas');
const gl = canvas.getContext('webgl');
gl.clearColor(1., 0., 0., 1.);
gl.clear(gl.COLOR_BUFFER_BIT);
</script>
</body>
</html>" >
</iframe>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="24" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("https://webglfundamentals.org/webgl/lessons/resources/webglfundamentals-webgl-state-diagram.jpg");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="24" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="24" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138" data-marpit-advanced-background="content">
<p><a href="https://webglfundamentals.org/webgl/lessons/resources/webgl-state-diagram.html?exampleId=smallest#no-help">States</a></p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="24" style="" data-marpit-pagination-total="138" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="25" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<p><a href="https://webglfundamentals.org/webgl/lessons/webgl-smallest-programs.html"><strong>Minimalistic "useful" program</strong></a>: <strong>shaders</strong>, but no vertex buffer yet</p>
<p>Add this code after <code>gl.clear</code>:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-comment">// vertex shader</span>
<span class="hljs-keyword">const</span> vs_source = <span class="hljs-string">`
void main() {
gl_Position = vec4(0., 0., 0., 1.); // center
gl_PointSize = 120.0;
}`</span>;
<span class="hljs-comment">// fragment shader</span>
<span class="hljs-keyword">const</span> fs_source = <span class="hljs-string">`
precision mediump float;
void main() {
gl_FragColor = vec4(0., 1., 0., 1.); // green
}`</span>;
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="26" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<p>Additional code: <a href="https://github.com/gfxfundamentals/webgl-fundamentals/blob/master/webgl/resources/webgl-utils.js">useful functions</a> (still no error checks!)</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-keyword">function</span> <span class="hljs-title function_">buildShader</span>(<span class="hljs-params">gl, shaderSource, shaderType</span>) {
<span class="hljs-keyword">const</span> shader = gl.<span class="hljs-title function_">createShader</span>(shaderType); <span class="hljs-comment">// Create the shader object</span>
gl.<span class="hljs-title function_">shaderSource</span>(shader, shaderSource); <span class="hljs-comment">// Load the shader source</span>
gl.<span class="hljs-title function_">compileShader</span>(shader); <span class="hljs-comment">// Compile the shader</span>
<span class="hljs-keyword">return</span> shader;
}
<span class="hljs-keyword">function</span> <span class="hljs-title function_">createProgram</span>(<span class="hljs-params">gl, shaders</span>) {
<span class="hljs-keyword">const</span> program = gl.<span class="hljs-title function_">createProgram</span>();
shaders.<span class="hljs-title function_">forEach</span>(<span class="hljs-keyword">function</span>(<span class="hljs-params">shader</span>) {
gl.<span class="hljs-title function_">attachShader</span>(program, shader);
});
gl.<span class="hljs-title function_">linkProgram</span>(program);
<span class="hljs-keyword">return</span> program;
}
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="27" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="27" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<p><strong>Finally</strong> : load shaders, program and render</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-comment">// load and compile the shaders</span>
<span class="hljs-keyword">const</span> vs = <span class="hljs-title function_">buildShader</span>(gl, vs_source, gl.<span class="hljs-property">VERTEX_SHADER</span>);
<span class="hljs-keyword">const</span> fs = <span class="hljs-title function_">buildShader</span>(gl, fs_source, gl.<span class="hljs-property">FRAGMENT_SHADER</span>);
<span class="hljs-comment">// Create program on the GPU!</span>
<span class="hljs-keyword">const</span> program = <span class="hljs-title function_">createProgram</span>(gl, [vs, fs]);
<span class="hljs-comment">// Set current program (WebGL is a state machine!)</span>
gl.<span class="hljs-title function_">useProgram</span>(program);
<span class="hljs-comment">// Draw 1 big point, see shaders </span>
<span class="hljs-keyword">const</span> offset = <span class="hljs-number">0</span>;
<span class="hljs-keyword">const</span> count = <span class="hljs-number">1</span>;
gl.<span class="hljs-title function_">drawArrays</span>(gl.<span class="hljs-property">POINTS</span>, offset, count);
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="28" data-theme="gaia" lang="en-US" style="--theme:gaia;"><iframe style=
"position: absolute;
top: 110px;
bottom: 110px;
left: 320px;
right: 320px;
width:100%;
height: 100%;
border: 0;" srcdoc ="
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<canvas width='640' height='480'></canvas>
<script>
const canvas = document.querySelector('canvas');
const gl = canvas.getContext('webgl'); // instead of '2d'
gl.clearColor(1., 0., 0., 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
// vertex shader
const vs_source = `
void main() {
gl_Position = vec4(0., 0., 0., 1.); // center
gl_PointSize = 120.0;
}`;
// fragment shader
const fs_source = `
precision mediump float;
void main() {
gl_FragColor = vec4(0., 1., 0., 1.); // green
}`;
function buildShader(gl, shaderSource, shaderType) {
const shader = gl.createShader(shaderType); // Create the shader object
gl.shaderSource(shader, shaderSource); // Load the shader source
gl.compileShader(shader); // Compile the shader
return shader;
}
function createProgram(gl, shaders) {
const program = gl.createProgram();
shaders.forEach(function(shader) {
gl.attachShader(program, shader);
});
gl.linkProgram(program);
return program;
}
// load and compile the shaders
const vs = buildShader(gl, vs_source, gl.VERTEX_SHADER);
const fs = buildShader(gl, fs_source, gl.FRAGMENT_SHADER);
// setup GLSL program
const program = createProgram(gl, [vs, fs]);
gl.useProgram(program);
// Draw 1 big point, see shaders
const offset = 0;
const count = 1;
gl.drawArrays(gl.POINTS, offset, count);
</script>
</body>
</html>" >
</iframe>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="29" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("https://webglfundamentals.org/webgl/lessons/resources/webglfundamentals-webgl-state-diagram.jpg");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="29" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="29" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138" data-marpit-advanced-background="content">
<p><a href="https://webglfundamentals.org/webgl/lessons/resources/webgl-state-diagram.html?exampleId=smallest-glsl#no-help">States</a></p>
</section>
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</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-background-color="#000000" data-class="lead invert" data-theme="gaia" lang="en-US" class="lead invert" style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-background-color="#000000" data-class="lead invert" data-theme="gaia" lang="en-US" class="lead invert" style="--background-color:#000000;--class:lead invert;--theme:gaia;background-color:#000000;background-image:none;" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("http://webglworkshop.com/presentations/images/showme.jpg");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="31" data-background-color="#000000" data-class="lead invert" data-theme="gaia" lang="en-US" class="lead invert" style="--background-color:#000000;--class:lead invert;--theme:gaia;background-color:#000000;background-image:none;" data-marpit-advanced-background="content"></section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-background-color="#000000" data-class="lead invert" data-theme="gaia" lang="en-US" class="lead invert" style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-class="lead" data-theme="gaia" lang="en-US" class="lead" style="--class:lead;--theme:gaia;" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("http://webglworkshop.com/presentations/images/result.gif");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="32" data-class="lead" data-theme="gaia" lang="en-US" class="lead" style="--class:lead;--theme:gaia;" data-marpit-advanced-background="content"></section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-class="lead" data-theme="gaia" lang="en-US" class="lead" style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="33" data-paginate="true" data-class="lead invert" data-theme="gaia" lang="en-US" class="lead invert" data-marpit-pagination="33" style="--paginate:true;--class:lead invert;--theme:gaia;" data-marpit-pagination-total="138">
<h1 id="my-first-triangle"><a href="http://webglworkshop.com/presentations/Workshop28-webgl2.html">My first triangle</a></h1>
<p>see <a href="https://webglfundamentals.org/webgl/lessons/webgl-fundamentals.html">webglfundamentals</a></p>
</section>
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<h1 id="initialization">Initialization</h1>
</section>
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<h2 id="1--data">1 . Data</h2>
</section>
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<ul>
<li>Describe triangle geometry with <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array">Float32Array</a> in <a href="https://www.scratchapixel.com/lessons/3d-basic-rendering/perspective-and-orthographic-projection-matrix/projection-matrix-GPU-rendering-pipeline-clipping.html">clip space</a></li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-keyword">const</span> vertices = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Float32Array</span>([
<span class="hljs-number">0.5</span>, <span class="hljs-number">0.5</span>,
-<span class="hljs-number">0.5</span>, <span class="hljs-number">0.5</span>,
-<span class="hljs-number">0.5</span>, -<span class="hljs-number">0.5</span>]); <span class="hljs-comment">// 2D points: 3 * (x, y) coordinates </span>
</code></pre>
<ul>
<li>Create Vertex Buffer Object (VBO) + <strong>UPLOAD</strong> to the GPU</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-keyword">const</span> vbo = gl.<span class="hljs-title function_">createBuffer</span>(); <span class="hljs-comment">// create Vertex Buffer Object (VBO) id</span>
<span class="hljs-comment">// Set current VBO: bind 'vbo' to the ARRAY_BUFFER bind point,</span>
<span class="hljs-comment">// a global variable internal to WebGL (state machine!)</span>
gl.<span class="hljs-title function_">bindBuffer</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, vbo);
<span class="hljs-comment">// UPLOAD current VBO to GPU, where it will be processed by the shaders</span>
<span class="hljs-comment">// <span class="hljs-doctag">NOTE:</span> STATIC_DRAW: optimization hint for WebGL: our data won't change</span>
gl.<span class="hljs-title function_">bufferData</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, vertices, gl.<span class="hljs-property">STATIC_DRAW</span>);
</code></pre>
</section>
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<h2 id="2--shaders">2 . Shaders</h2>
<p>which will use buffer data</p>
</section>
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<ul>
<li>Vertex Shader: gl_Position will be used by the fragment shader</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-glsl"><span class="hljs-keyword">attribute</span> <span class="hljs-type">vec2</span> a_position; <span class="hljs-comment">// IN, from buffer: 2D point</span>
<span class="hljs-type">void</span> main() {
<span class="hljs-built_in">gl_Position</span> = <span class="hljs-type">vec4</span>(a_position, <span class="hljs-number">0.0</span>, <span class="hljs-number">1.0</span>); <span class="hljs-comment">// a_position.x, a_position.y, 0, 1, used by the fragment shader</span>
}
</code></pre>
<ul>
<li>Fragment Shader: gl_FragColor is the final fragment color</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-glsl"><span class="hljs-keyword">precision</span> <span class="hljs-keyword">mediump</span> <span class="hljs-type">float</span>; <span class="hljs-comment">// float accuracy: lowp, mediump, highp</span>
<span class="hljs-keyword">uniform</span> <span class="hljs-type">vec4</span> u_color; <span class="hljs-comment">// UNIFORM == CONSTANT for entire shader program</span>
<span class="hljs-type">void</span> main() {
<span class="hljs-built_in">gl_FragColor</span> = u_color; <span class="hljs-comment">// final framebuffer color: RGBA</span>
}
</code></pre>
<footer><a href="https://webglfundamentals.org/webgl/lessons/webgl-precision-issues.html">https://webglfundamentals.org/webgl/lessons/webgl-precision-issues.html</a>)</footer>
</section>
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<h1 id="detecting-shader-compilation-errors">Detecting shader compilation errors</h1>
<p>Call this before <code>gl.useProgram</code> (optional, slow, but often useful <img class="emoji" draggable="false" alt="😉" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f609.svg" data-marp-twemoji=""/>)</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-keyword">function</span> <span class="hljs-title function_">checkShaders</span>(<span class="hljs-params">gl, vs, fs, program</span>) {
<span class="hljs-keyword">if</span> (!gl.<span class="hljs-title function_">getShaderParameter</span>(vs, gl.<span class="hljs-property">COMPILE_STATUS</span>))
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(gl.<span class="hljs-title function_">getShaderInfoLog</span>(vs));
<span class="hljs-keyword">if</span> (!gl.<span class="hljs-title function_">getShaderParameter</span>(fs, gl.<span class="hljs-property">COMPILE_STATUS</span>))
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(gl.<span class="hljs-title function_">getShaderInfoLog</span>(fs));
<span class="hljs-keyword">if</span> (!gl.<span class="hljs-title function_">getProgramParameter</span>(program, gl.<span class="hljs-property">LINK_STATUS</span>))
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(gl.<span class="hljs-title function_">getProgramInfoLog</span>(program));
}
</code></pre>
</section>
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<h2 id="3--connecting-buffer-and-shaders">3 . Connecting Buffer and Shaders</h2>
</section>
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<ul>
<li>
<p>Retrieve the variables declared in the shaders</p>
<ul>
<li>costly call (like most <code>gl.getXXX</code> calls)</li>
<li>only do this during initialization</li>
<li>will be used during rendering</li>
</ul>
</li>
<li>
<p><img class="emoji" draggable="false" alt="⚠️" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/26a0.svg" data-marp-twemoji=""/> use the exact same name that has been defined in the shader</p>
<ul>
<li>arbitrary name, chosen by the developer! (<code>u_</code> for <code>uniform</code>, <code>a_</code> for <code>attribute</code>, <code>v_</code> for <code>varying</code> are common conventions)</li>
</ul>
</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-comment">// Retrieve 'u_color' shader UNIFORM variable as an id</span>
<span class="hljs-keyword">const</span> u_colorLoc = gl.<span class="hljs-title function_">getUniformLocation</span>(program, <span class="hljs-string">'u_color'</span>);
<span class="hljs-comment">// Retrieve 'a_position' shader ATTRIBUTE variable as an id</span>
<span class="hljs-keyword">const</span> a_positionLoc = gl.<span class="hljs-title function_">getAttribLocation</span>(program, <span class="hljs-string">'a_position'</span>);
</code></pre>
</section>
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<h2 id="4--rendering">4 . Rendering!</h2>
<p>Buffers and Shaders are ready, we still need to:</p>
<ul>
<li>define states</li>
<li>describe buffer layout (often complex since it is very flexible!)</li>
<li>draw the scene</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="43" data-paginate="true" data-footer="https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/vertexAttribPointer" data-theme="gaia" lang="en-US" data-marpit-pagination="43" style="--paginate:true;--footer:https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/vertexAttribPointer;--theme:gaia;" data-marpit-pagination-total="138">
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">gl.<span class="hljs-title function_">clearColor</span>(<span class="hljs-number">0.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">1.</span>); <span class="hljs-comment">// Set current clear color (black)</span>
gl.<span class="hljs-title function_">clear</span>(gl.<span class="hljs-property">COLOR_BUFFER_BIT</span>); <span class="hljs-comment">// Clear the canvas to current color</span>
gl.<span class="hljs-title function_">useProgram</span>(program); <span class="hljs-comment">// Set current program (pair of shaders)</span>
<span class="hljs-comment">// Set the color (constant triangle color, see shader)</span>
gl.<span class="hljs-title function_">uniform4fv</span>(u_colorLoc, [<span class="hljs-number">1.0</span>, <span class="hljs-number">0.0</span>, <span class="hljs-number">0.0</span>, <span class="hljs-number">1.0</span>]);
<span class="hljs-comment">// Tell WebGL how to take data from the VBO</span>
<span class="hljs-comment">// and supply it to the attribute in the shader.</span>
gl.<span class="hljs-title function_">enableVertexAttribArray</span>(a_positionLoc); <span class="hljs-comment">// Turn the attribute on</span>
gl.<span class="hljs-title function_">bindBuffer</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, vbo); <span class="hljs-comment">// set current vbo</span>
<span class="hljs-comment">// Tell the attribute how to get data out of positionBuffer</span>
<span class="hljs-comment">// (ARRAY_BUFFER)</span>
<span class="hljs-keyword">const</span> size = <span class="hljs-number">2</span>; <span class="hljs-comment">// 2 components per iteration</span>
<span class="hljs-keyword">const</span> type = gl.<span class="hljs-property">FLOAT</span>; <span class="hljs-comment">// the data is 32bit floats</span>
<span class="hljs-keyword">const</span> normalize = <span class="hljs-literal">false</span>; <span class="hljs-comment">// don't normalize the data</span>
<span class="hljs-comment">// stride: 0 = move forward size * sizeof(type) each iteration</span>
<span class="hljs-comment">// to get the next position</span>
<span class="hljs-keyword">const</span> stride = <span class="hljs-number">0</span>;
<span class="hljs-keyword">const</span> offset = <span class="hljs-number">0</span>; <span class="hljs-comment">// start at the beginning of the buffer</span>
gl.<span class="hljs-title function_">vertexAttribPointer</span>(a_positionLoc, size, type, normalize, stride, offset);
</code></pre>
<footer><a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/vertexAttribPointer">https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/vertexAttribPointer</a></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="44" data-paginate="true" data-theme="gaia" lang="en-US" data-marpit-pagination="44" style="--paginate:true;--theme:gaia;" data-marpit-pagination-total="138">
<ul>
<li>Draw: here we'll be using <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/drawArrays"><code>gl.drawArrays</code></a></li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-comment">// primitiveType == gl.TRIANGLES:</span>
<span class="hljs-comment">// each time our vertex shader is run 3 times,</span>
<span class="hljs-comment">// WebGL will draw a triangle</span>
<span class="hljs-comment">// based on the 3 values we set gl_Position to (see shader)</span>
<span class="hljs-keyword">const</span> primitiveType = gl.<span class="hljs-property">TRIANGLES</span>;
<span class="hljs-comment">// Start index of the first vertex</span>
<span class="hljs-comment">// Must be a valid multiple of the size of the given type.</span>
<span class="hljs-keyword">const</span> startIndex = <span class="hljs-number">0</span>;
<span class="hljs-comment">// Execute our vertex shader 3 times,</span>
<span class="hljs-comment">// using 2 elements from the array (see size 2 above)</span>
<span class="hljs-comment">// setting a_position.x and a_position.y</span>
<span class="hljs-keyword">const</span> count = <span class="hljs-number">3</span>;
gl.<span class="hljs-title function_">drawArrays</span>(primitiveType, startIndex, count);
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="45" data-class="lead" data-theme="gaia" lang="en-US" class="lead" style="--class:lead;--theme:gaia;"><iframe style=
"position: absolute;
top: 110px;
bottom: 110px;
left: 320px;
right: 320px;
width:100%;
height: 100%;
border: 0;" srcdoc ="
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<canvas width='640' height='480'></canvas>
<script>
const canvas = document.querySelector('canvas');
const gl = canvas.getContext('webgl'); // instead of '2d'
gl.clearColor(0., 0., 0., 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
// vertex shader
const vs_source = `
attribute vec2 a_position; // in, from buffer: 2D point
void main() {
gl_Position = vec4(a_position, 0.0, 1.0); // a_position.x, a_position.y, 0, 1
}
`;
// fragment shader
const fs_source = `
precision mediump float; // float accuracy: lowp, mediump, highp
uniform vec4 u_color; // UNIFORM == CONSTANT for entire shader program
void main() {
gl_FragColor = u_color; // final framebuffer color: RGBA
}
`;
function buildShader(gl, shaderSource, shaderType) {
const shader = gl.createShader(shaderType); // Create the shader object
gl.shaderSource(shader, shaderSource); // Load the shader source
gl.compileShader(shader); // Compile the shader
return shader;
}
function createProgram(gl, shaders) {
const program = gl.createProgram();
shaders.forEach(function(shader) {
gl.attachShader(program, shader);
});
gl.linkProgram(program);
return program;
}
// load and compile the shaders
const vs = buildShader(gl, vs_source, gl.VERTEX_SHADER);
const fs = buildShader(gl, fs_source, gl.FRAGMENT_SHADER);
// setup GLSL program
const program = createProgram(gl, [vs, fs]);
function checkShaders(gl, vs, fs, program) {
if (!gl.getShaderParameter(vs, gl.COMPILE_STATUS)) {
console.error(gl.getShaderInfoLog(vs));
}
if (!gl.getShaderParameter(fs, gl.COMPILE_STATUS)) {
console.error(gl.getShaderInfoLog(fs));
}
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
console.error(gl.getProgramInfoLog(program));
}
}
checkShaders(gl, vs, fs, program);
const vertices = new Float32Array([
0.5, 0.5,
-0.5, 0.5,
-0.5, -0.5]); // 2D points: 3 * (x, y) coordinates
const vbo = gl.createBuffer(); // create Vertex Buffer Object (VBO) id
gl.bindBuffer(gl.ARRAY_BUFFER, vbo); // set current VBO (WebGL is a state machine!)
// UPLOAD current VBO to GPU,
// where it will be processed by the shaders
// NOTE: STATIC_DRAW: hint for WebGL: our data won't change
gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
// Retrieve 'u_color' shader UNIFORM variable as an id
const u_colorLoc = gl.getUniformLocation(program, 'u_color');
// Retrieve 'a_position' shader ATTRIBUTE variable as an id
const a_positionLoc = gl.getAttribLocation(program, 'a_position');
gl.clearColor(0., 0., 0., 1.); // Set current clear color (black)
gl.clear(gl.COLOR_BUFFER_BIT); // Clear the canvas to current color
gl.useProgram(program); // Set current program (pair of shaders)
// Set the color (constant triangle color, see shader)
gl.uniform4fv(u_colorLoc, [1.0, 0.0, 0.0, 1.0]);
// Tell WebGL how to take data from the VBO
// and supply it to the attribute in the shader.
gl.enableVertexAttribArray(a_positionLoc); // Turn the attribute on
gl.bindBuffer(gl.ARRAY_BUFFER, vbo); // set current vbo
// Tell the attribute how to get data out of positionBuffer
// (ARRAY_BUFFER)
const size = 2; // 2 components per iteration
const type = gl.FLOAT; // the data is 32bit floats
const normalize = false; // don't normalize the data
// stride: 0 = move forward size * sizeof(type) each iteration
// to get the next position
const stride = 0;
const offset = 0; // start at the beginning of the buffer
gl.vertexAttribPointer(a_positionLoc, size, type, normalize, stride, offset);
// primitiveType == gl.TRIANGLES:
// each time our vertex shader is run 3 times,
// WebGL will draw a triangle
// based on the 3 values we set gl_Position to (see shader)
const primitiveType = gl.TRIANGLES;
// Start index of the first vertex
const startIndex = 0;
// Execute our vertex shader 3 times,
// using 2 elements from the array (see size 2 above)
// setting a_position.x and a_position.y
const count = 3;
gl.drawArrays(primitiveType, startIndex, count);
</script>
</body>
</html>" >
</iframe>
</section>
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<p><a href="https://webglfundamentals.org/webgl/lessons/resources/webgl-state-diagram.html?exampleId=rainbow-triangle#no-help">States</a></p>
</section>
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<h1 id="almost-there">Almost there!</h1>
<p>We still need to define one color per vertex instead of the constant <code>uniform</code> color<br />
cf. <a href="https://webglfundamentals.org/webgl/lessons/webgl-how-it-works.html">webglfundamentals</a></p>
</section>
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<h2 id="1--data-1">1 . Data</h2>
<p>adding a color attribute per vertex, with a new array and a new buffer!</p>
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<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"> <span class="hljs-comment">// 2D points: 3 * (x, y) coordinates </span>
<span class="hljs-comment">// (sqrt(3) / 2 - 0.5) * 640 / 480 == 0.4880338..</span>
<span class="hljs-keyword">const</span> vertices = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Float32Array</span>([-<span class="hljs-number">0.75</span>, -<span class="hljs-number">0.5</span>,
<span class="hljs-number">0.75</span>, -<span class="hljs-number">0.5</span>,
<span class="hljs-number">0.</span>, <span class="hljs-number">0.49</span>]);
<span class="hljs-comment">// create Vertex Buffer Object (VBO) id</span>
<span class="hljs-keyword">const</span> vertexBuffer = gl.<span class="hljs-title function_">createBuffer</span>();
<span class="hljs-comment">// set current VBO (WebGL is a state machine!)</span>
gl.<span class="hljs-title function_">bindBuffer</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, vertexBuffer);
<span class="hljs-comment">// UPLOAD vertexBuffer VBO to GPU,</span>
gl.<span class="hljs-title function_">bufferData</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, vertices, gl.<span class="hljs-property">STATIC_DRAW</span>);
<span class="hljs-comment">// ** NEW **</span>
<span class="hljs-comment">// RGB colors: 3 * (r, g, b, a) values</span>
<span class="hljs-keyword">const</span> colors = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Float32Array</span>([ <span class="hljs-number">1.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">1.</span>,
<span class="hljs-number">0.</span>, <span class="hljs-number">1.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">1.</span>,
<span class="hljs-number">0.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">1.</span>, <span class="hljs-number">1.</span>]);
<span class="hljs-comment">// create Vertex Buffer Object (VBO) id</span>
<span class="hljs-keyword">const</span> colorBuffer = gl.<span class="hljs-title function_">createBuffer</span>();
<span class="hljs-comment">// set current VBO (WebGL is a state machine!)</span>
gl.<span class="hljs-title function_">bindBuffer</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, colorBuffer);
<span class="hljs-comment">// UPLOAD colorBuffer VBO to GPU,</span>
gl.<span class="hljs-title function_">bufferData</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, colors, gl.<span class="hljs-property">STATIC_DRAW</span>);
</code></pre>
</section>
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<h2 id="2--shaders-1">2 . Shaders</h2>
<p>we use the new color attribute that we choose to name <code>a_color</code><br />
(we could name it <code>mylittlevertexcolor</code> but it looks less professional)</p>
</section>
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<ul>
<li>Vertex Shader: new <code>varying</code> variable, will be <strong>interpolated</strong></li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-glsl"><span class="hljs-keyword">attribute</span> <span class="hljs-type">vec2</span> a_position; <span class="hljs-comment">// IN, from buffer: 2D point</span>
<span class="hljs-keyword">attribute</span> <span class="hljs-type">vec4</span> a_color; <span class="hljs-comment">// IN, from buffer: RGB color</span>
<span class="hljs-keyword">varying</span> <span class="hljs-type">vec4</span> v_color; <span class="hljs-comment">// OUT, to fragment shader</span>
<span class="hljs-type">void</span> main() {
v_color = a_color; <span class="hljs-comment">// color passthrough, sent to fragment shader (interpolated)</span>
<span class="hljs-built_in">gl_Position</span> = <span class="hljs-type">vec4</span>(a_position, <span class="hljs-number">0.0</span>, <span class="hljs-number">1.0</span>); <span class="hljs-comment">// used by the fragment shader</span>
}
</code></pre>
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<ul>
<li>Fragment Shader</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-glsl"><span class="hljs-keyword">precision</span> <span class="hljs-keyword">mediump</span> <span class="hljs-type">float</span>; <span class="hljs-comment">// float accuracy: lowp, mediump, highp</span>
<span class="hljs-keyword">varying</span> <span class="hljs-type">vec4</span> v_color; <span class="hljs-comment">// IN, INTERPOLATED color from vertex shader</span>
<span class="hljs-type">void</span> main() {
<span class="hljs-built_in">gl_FragColor</span> = <span class="hljs-type">vec4</span>(v_color); <span class="hljs-comment">// final framebuffer color: RGBA</span>
}
</code></pre>
</section>
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<h2 id="3--connecting-buffer-and-shaders-1">3 . Connecting Buffer and Shaders</h2>
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<ul>
<li>
<p>Retrieve the variables declared in the shaders</p>
<ul>
<li>costly call (like most <code>gl.getXXX</code> calls)</li>
<li>only do this during initialization</li>
<li>will be used during rendering</li>
</ul>
</li>
<li>
<p><img class="emoji" draggable="false" alt="⚠️" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/26a0.svg" data-marp-twemoji=""/> use the exact same name that has been defined in the shader</p>
</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-comment">// Retrieve 'a_color' shader ATTRIBUTE variable as an id</span>
<span class="hljs-keyword">const</span> a_colorLoc = gl.<span class="hljs-title function_">getAttribLocation</span>(program, <span class="hljs-string">'a_color'</span>);
<span class="hljs-comment">// Retrieve 'a_position' shader ATTRIBUTE variable as an id</span>
<span class="hljs-keyword">const</span> a_positionLoc = gl.<span class="hljs-title function_">getAttribLocation</span>(program, <span class="hljs-string">'a_position'</span>);
</code></pre>
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<h2 id="4--rendering-1">4 . Rendering!</h2>
<p>Buffers and Shaders are ready, we still need to:</p>
<ul>
<li>define states</li>
<li>describe buffer layout (often complex since it is very flexible!)</li>
<li>draw the scene</li>
</ul>
</section>
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<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"> gl.<span class="hljs-title function_">clearColor</span>(<span class="hljs-number">0.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">0.</span>, <span class="hljs-number">1.</span>);
gl.<span class="hljs-title function_">clear</span>(gl.<span class="hljs-property">COLOR_BUFFER_BIT</span>);
gl.<span class="hljs-title function_">useProgram</span>(program); <span class="hljs-comment">// Set current program</span>
{
<span class="hljs-comment">// Turn the attribute on</span>
gl.<span class="hljs-title function_">enableVertexAttribArray</span>(a_positionLoc);
gl.<span class="hljs-title function_">bindBuffer</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, vertexBuffer); <span class="hljs-comment">// set current vbo</span>
<span class="hljs-comment">// Tell the attribute how to get data out of positionBuffer</span>
<span class="hljs-comment">// (ARRAY_BUFFER)</span>
<span class="hljs-keyword">const</span> size = <span class="hljs-number">2</span>; <span class="hljs-comment">// 2 components per iteration</span>
<span class="hljs-keyword">const</span> type = gl.<span class="hljs-property">FLOAT</span>; <span class="hljs-comment">// the data is 32bit floats</span>
<span class="hljs-keyword">const</span> normalize = <span class="hljs-literal">false</span>; <span class="hljs-comment">// don't normalize the data</span>
<span class="hljs-comment">// stride: 0 = move forward size * sizeof(type) each iteration</span>
<span class="hljs-comment">// to get the next position</span>
<span class="hljs-keyword">const</span> stride = <span class="hljs-number">0</span>;
<span class="hljs-keyword">const</span> offset = <span class="hljs-number">0</span>; <span class="hljs-comment">// start at the beginning of the buffer</span>
gl.<span class="hljs-title function_">vertexAttribPointer</span>(a_positionLoc, size, type, normalize, stride, offset);
}
</code></pre>
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<ul>
<li>Same steps for <code>colorBuffer</code><br />
<strong>NOTE</strong>: Refactoring! In real life we try and avoid repetition: <a href="https://en.wikipedia.org/wiki/Don%27t_repeat_yourself">DRY</a></li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">{
<span class="hljs-comment">// Tell WebGL how to take data from the VBO</span>
<span class="hljs-comment">// and supply it to the attribute in the shader.</span>
gl.<span class="hljs-title function_">enableVertexAttribArray</span>(a_colorLoc); <span class="hljs-comment">// Turn the attribute on</span>
gl.<span class="hljs-title function_">bindBuffer</span>(gl.<span class="hljs-property">ARRAY_BUFFER</span>, colorBuffer);
<span class="hljs-comment">// Tell the color attribute how to get data out of colorBuffer (ARRAY_BUFFER)</span>
<span class="hljs-keyword">const</span> size = <span class="hljs-number">4</span>; <span class="hljs-comment">// <span class="hljs-doctag">NOTE:</span> 4 components per iteration</span>
<span class="hljs-keyword">const</span> type = gl.<span class="hljs-property">FLOAT</span>; <span class="hljs-comment">// the data is 32bit floats</span>
<span class="hljs-keyword">const</span> normalize = <span class="hljs-literal">false</span>; <span class="hljs-comment">// don't normalize the data</span>
<span class="hljs-comment">// stride: 0 = move forward size * sizeof(type) each iteration</span>
<span class="hljs-comment">// to get the next position</span>
<span class="hljs-keyword">const</span> stride = <span class="hljs-number">0</span>;
<span class="hljs-keyword">const</span> offset = <span class="hljs-number">0</span>; <span class="hljs-comment">// start at the beginning of the buffer</span>
gl.<span class="hljs-title function_">vertexAttribPointer</span>( a_colorLoc, size, type, normalize, stride, offset);
}
</code></pre>
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<ul>
<li>Draw: same code as before!</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript"><span class="hljs-comment">// primitiveType == gl.TRIANGLES:</span>
<span class="hljs-comment">// each time our vertex shader is run 3 times,</span>
<span class="hljs-comment">// WebGL will draw a triangle</span>
<span class="hljs-comment">// based on the 3 values we set gl_Position to (see shader)</span>
<span class="hljs-keyword">const</span> primitiveType = gl.<span class="hljs-property">TRIANGLES</span>;
<span class="hljs-comment">// Start index of the first vertex</span>
<span class="hljs-comment">// Must be a valid multiple of the size of the given type.</span>
<span class="hljs-keyword">const</span> startIndex = <span class="hljs-number">0</span>;
<span class="hljs-comment">// Execute our vertex shader 3 times,</span>
<span class="hljs-comment">// using 2 elements from the array (see size 2 above)</span>
<span class="hljs-comment">// setting a_position.x and a_position.y</span>
<span class="hljs-keyword">const</span> count = <span class="hljs-number">3</span>;
gl.<span class="hljs-title function_">drawArrays</span>(primitiveType, startIndex, count);
</code></pre>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="59" data-theme="gaia" lang="en-US" style="--theme:gaia;"><iframe style=
"position: absolute;
top: 110px;
bottom: 110px;
left: 320px;
right: 320px;
width:100%;
height: 100%;
border: 0;" srcdoc ="
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<canvas width='640' height='480'></canvas>
<script>
const canvas = document.querySelector('canvas');
const gl = canvas.getContext('webgl'); // instead of '2d'
gl.clearColor(0., 0., 0., 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
// vertex shader
const vs_source = `
attribute vec2 a_position; // IN, from buffer: 2D point
attribute vec3 a_color; // IN, from buffer: RGB color
varying vec3 v_color; // OUT, to fragment shader
void main() {
v_color = a_color; // color passthrough, sent to fragment shader
gl_Position = vec4(a_position, 0.0, 1.0); // used by the fragment shader
}
`;
// fragment shader
const fs_source = `
precision mediump float; // float accuracy: lowp, mediump, highp
varying vec3 v_color; // IN, INTERPOLATED color from vertex shader
void main() {
gl_FragColor = vec4(v_color, 1.); // final framebuffer color: RGBA
}
`;
function buildShader(gl, shaderSource, shaderType) {
const shader = gl.createShader(shaderType); // Create the shader object