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class="_row_192pu_24"><a href="/typescript/flatten-object-with-periods" class="_link_192pu_66">Flatten Object With Periods</a></div><div class="_row_192pu_24"><a href="/typescript/type-guards" class="_link_192pu_66">Type Guards</a></div><!--]--></div></div></div><!--]--></nav></div></div><div class="_main_16c5m_17"><div class="_content_16c5m_93"><div class="_wrapper_vom09_1" hastransition="true"><div class="_content_vom09_14"><button class="_theme_toggle_vom09_24 _button_jz7in_1 _theme_toggle_vom09_24"><span></span></button><!--[--><!--[--><main class="_content_1gz79_1"><!--[--><h1>Basics Of WebGL (Drawing A Cube)</h1><article><div><h2 id="helpful-documentation"><a href="#helpful-documentation"><!--[-->Helpful documentation<!--]--></a></h2><ul><!--[--><li><!--[--><a href="https://open.gl/" rel="nofollow" target="_blank"><!--[-->https://open.gl/<!--]--></a><!--]--></li><li><!--[-->This youtube series: <a href="https://www.youtube.com/watch?v=kB0ZVUrI4Aw" rel="nofollow" target="_blank"><!--[-->Basics<!--]--></a>, <a href="https://www.youtube.com/watch?v=3yLL9ADo-ko" rel="nofollow" target="_blank"><!--[-->Making a cube, applying transformations<!--]--></a>, <a href="https://www.youtube.com/watch?v=hpnd11doMgc&t=52s" rel="nofollow" target="_blank"><!--[-->Texturing<!--]--></a><!--]--></li><!--]--></ul><h2 id="vertices-and-indices"><a href="#vertices-and-indices"><!--[-->Vertices and Indices<!--]--></a></h2><p><!--[--><strong><!--[-->Vertices<!--]--></strong> are points with specific coordinates <code><!--[-->{x,y,z}<!--]--></code> in a 3D-space. We can build any figure by connecting <strong><!--[-->vertices<!--]--></strong> in triangles with <strong><!--[-->indices<!--]--></strong>.<!--]--></p><h2 id="shaders"><a href="#shaders"><!--[-->Shaders<!--]--></a></h2><p><!--[-->Shaders are functions, written in C, which describe how to draw and color polygons to Graphic Card.<!--]--></p><p><!--[--><a href="/frontend/webgl/vertex-shaders" class=""><!--[-->Vertex Shaders<!--]--></a> describe <strong><!--[-->vertice<!--]--></strong> positions, so Graphic Card can position them by connecting with <strong><!--[-->indices<!--]--></strong> and project to 2D canvas.<!--]--></p><p><!--[--><a href="/frontend/webgl/fragment-shaders" class=""><!--[-->Fragment Shaders<!--]--></a> describe the way polygons should be colored by assigning colors to Vertices or by applying textures to polygons.<!--]--></p><p><!--[-->Shaders can have parameters passed from Javascript code (<code><!--[-->uniforms<!--]--></code>, <code><!--[-->varyings<!--]--></code> and <code><!--[-->attributes<!--]--></code>). <a href="/frontend/webgl/fragment-shaders" class=""><!--[-->Fragment Shaders<!--]--></a> can also access data from <a href="/frontend/webgl/vertex-shaders" class=""><!--[-->Vertex Shaders<!--]--></a> (that ones called <code><!--[-->varyings<!--]--></code>).<!--]--></p><p><!--[--><img src="https://open.gl/media/img/c2_pipeline.png" alt><!--]--></p><h2 id="program"><a href="#program"><!--[-->Program<!--]--></a></h2><p><!--[-->Program, as far as I understand, is a scene, that's described with <strong><!--[-->Vertices<!--]--></strong>, <strong><!--[-->Indices<!--]--></strong>, specific <a href="/frontend/webgl/vertex-shaders" class=""><!--[-->Vertex Shaders<!--]--></a> and <a href="/frontend/webgl/fragment-shaders" class=""><!--[-->Fragment Shaders<!--]--></a>.<!--]--></p><h2 id="applying-transformations"><a href="#applying-transformations"><!--[-->Applying transformations<!--]--></a></h2><p><!--[-->The best way to change positions inside <a href="/frontend/webgl/vertex-shaders" class=""><!--[-->Vertex Shaders<!--]--></a> or color in <a href="/frontend/webgl/fragment-shaders" class=""><!--[-->Fragment Shaders<!--]--></a> is to pass parameters (also called <code><!--[-->uniforms<!--]--></code> and <code><!--[-->varyings<!--]--></code>).<!--]--></p><p><!--[-->Read about that at <a href="https://open.gl/transformations" rel="nofollow" target="_blank"><!--[-->open.gl<!--]--></a> and at <a href="/frontend/webgl/vertex-shaders" class=""><!--[-->Vertex Shaders<!--]--></a>.<!--]--></p><h2 id="source-code-with-explanations"><a href="#source-code-with-explanations"><!--[-->Source code with explanations<!--]--></a></h2><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-adcfc5">// render-a-cube.ts</span></span><span class="line"><span class="ct-1b92cf">import</span><span class="ct-64281f"> { </span><span class="ct-86a21d">createShader</span><span class="ct-64281f"> } </span><span class="ct-1b92cf">from</span><span class="ct-64281f"> </span><span class="ct-d37380">"./create-shader"</span><span class="ct-64281f">;</span></span><span class="line"><span class="ct-1b92cf">import</span><span class="ct-64281f"> </span><span class="ct-86a21d">vxShader</span><span class="ct-64281f"> </span><span class="ct-1b92cf">from</span><span class="ct-64281f"> </span><span class="ct-d37380">"./vertex.glsl?raw"</span><span class="ct-64281f">;</span></span><span class="line"><span class="ct-1b92cf">import</span><span class="ct-64281f"> </span><span class="ct-86a21d">fgShader</span><span class="ct-64281f"> </span><span class="ct-1b92cf">from</span><span class="ct-64281f"> </span><span class="ct-d37380">"./fragment.glsl?raw"</span><span class="ct-64281f">;</span></span><span class="line"></span><span class="line"><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">canvas</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">document</span><span class="ct-64281f">.</span><span class="ct-76004f">getElementyId</span><span class="ct-64281f">(</span><span class="ct-d37380">'view'</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">ctx</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">canvas</span><span class="ct-64281f">.</span><span class="ct-76004f">getRenderingContext</span><span class="ct-64281f">(</span><span class="ct-d37380">'webgl'</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-adcfc5">// should be put inside requestAnimationFrame</span></span><span class="line"><span class="ct-76004f">drawCube</span><span class="ct-64281f">(</span><span class="ct-86a21d">ctx</span><span class="ct-64281f">)(); </span></span><span class="line"></span><span class="line"><span class="ct-e04d55">function</span><span class="ct-64281f"> </span><span class="ct-76004f">drawCube</span><span class="ct-64281f"> (</span></span><span class="line"><span class="ct-65b1d0"> </span><span class="ct-7a9410">gl</span><span class="ct-b7f1ad">:</span><span class="ct-65b1d0"> </span><span class="ct-6e3c4d">WebGL2RenderingContext</span><span class="ct-65b1d0">, </span></span><span class="line"><span class="ct-65b1d0"> </span><span class="ct-7a9410">width</span><span class="ct-b7f1ad">:</span><span class="ct-65b1d0"> </span><span class="ct-758bcb">number</span><span class="ct-65b1d0">,</span></span><span class="line"><span class="ct-65b1d0"> </span><span class="ct-7a9410">height</span><span class="ct-b7f1ad">:</span><span class="ct-65b1d0"> </span><span class="ct-758bcb">number</span></span><span class="line"><span class="ct-64281f">) {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// Initializing viewport</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">viewport</span><span class="ct-64281f">(</span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-86a21d">width</span><span class="ct-64281f">, </span><span class="ct-86a21d">height</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">clearColor</span><span class="ct-64281f">(</span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-a52b15">0</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">clear</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">COLOR_BUFFER_BIT</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">prg</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">createProgram</span><span class="ct-64281f">();</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">if</span><span class="ct-64281f"> (</span><span class="ct-1b92cf">!</span><span class="ct-86a21d">prg</span><span class="ct-64281f">) {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">throw</span><span class="ct-64281f"> </span><span class="ct-1b92cf">new</span><span class="ct-64281f"> </span><span class="ct-b615da">Error</span><span class="ct-64281f">(</span><span class="ct-d37380">"Can't init programm"</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> }</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// Setting up VERTEX and FRAGMENT shaders</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">vx</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-76004f">createShader</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">, </span><span class="ct-86a21d">vxShader</span><span class="ct-64281f">, </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">VERTEX_SHADER</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">attachShader</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">, </span><span class="ct-86a21d">vx</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">fx</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-76004f">createShader</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">, </span><span class="ct-86a21d">fgShader</span><span class="ct-64281f">, </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">FRAGMENT_SHADER</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">attachShader</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">, </span><span class="ct-86a21d">fx</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">linkProgram</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">if</span><span class="ct-64281f"> (</span><span class="ct-1b92cf">!</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">getProgramParameter</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">, </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">LINK_STATUS</span><span class="ct-64281f">)) {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">throw</span><span class="ct-64281f"> </span><span class="ct-1b92cf">new</span><span class="ct-64281f"> </span><span class="ct-b615da">Error</span><span class="ct-64281f">(</span><span class="ct-d37380">"Could not initialise shaders"</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> }</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// Cube's vertices Array<[x,y,z]>, 8 items</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">vertices</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> [</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 0</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 1</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 2</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 3</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 4</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 5</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 6</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">-</span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 7</span></span><span class="line"><span class="ct-64281f"> ];</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// indices, that form triangles, that form cube sides</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">indices</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> [</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">2</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// side 0 (first triangle)</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-a52b15">3</span><span class="ct-64281f">, </span><span class="ct-a52b15">2</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// side 0 (second triangle)</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-a52b15">4</span><span class="ct-64281f">, </span><span class="ct-a52b15">7</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// side 1 (first triangle)</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">7</span><span class="ct-64281f">, </span><span class="ct-a52b15">3</span><span class="ct-64281f">, </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// side 1 (second triangle)</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">5</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// ...</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">5</span><span class="ct-64281f">, </span><span class="ct-a52b15">4</span><span class="ct-64281f">, </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span><span class="ct-a52b15">2</span><span class="ct-64281f">, </span><span class="ct-a52b15">6</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">6</span><span class="ct-64281f">, </span><span class="ct-a52b15">5</span><span class="ct-64281f">, </span><span class="ct-a52b15">1</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">2</span><span class="ct-64281f">, </span><span class="ct-a52b15">3</span><span class="ct-64281f">, </span><span class="ct-a52b15">7</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">7</span><span class="ct-64281f">, </span><span class="ct-a52b15">6</span><span class="ct-64281f">, </span><span class="ct-a52b15">2</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">4</span><span class="ct-64281f">, </span><span class="ct-a52b15">5</span><span class="ct-64281f">, </span><span class="ct-a52b15">6</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">6</span><span class="ct-64281f">, </span><span class="ct-a52b15">7</span><span class="ct-64281f">, </span><span class="ct-a52b15">4</span><span class="ct-64281f">,</span></span><span class="line"><span class="ct-64281f"> ];</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// createe a vertex buffer and bind vertices to it</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">squareVertexBuffer</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">createBuffer</span><span class="ct-64281f">();</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bindBuffer</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ARRAY_BUFFER</span><span class="ct-64281f">, </span><span class="ct-86a21d">squareVertexBuffer</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bufferData</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ARRAY_BUFFER</span><span class="ct-64281f">, </span><span class="ct-1b92cf">new</span><span class="ct-64281f"> </span><span class="ct-b615da">Float32Array</span><span class="ct-64281f">(</span><span class="ct-86a21d">vertices</span><span class="ct-64281f">), </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">STATIC_DRAW</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bindBuffer</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ARRAY_BUFFER</span><span class="ct-64281f">, </span><span class="ct-f2374f">null</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// create a vertex buffer and bind indices to it</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">squareIndexBuffer</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">createBuffer</span><span class="ct-64281f">();</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bindBuffer</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ELEMENT_ARRAY_BUFFER</span><span class="ct-64281f">, </span><span class="ct-86a21d">squareIndexBuffer</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bufferData</span><span class="ct-64281f">(</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ELEMENT_ARRAY_BUFFER</span><span class="ct-64281f">,</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">new</span><span class="ct-64281f"> </span><span class="ct-b615da">Uint16Array</span><span class="ct-64281f">(</span><span class="ct-86a21d">indices</span><span class="ct-64281f">),</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">STATIC_DRAW</span></span><span class="line"><span class="ct-64281f"> );</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bindBuffer</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ELEMENT_ARRAY_BUFFER</span><span class="ct-64281f">, </span><span class="ct-f2374f">null</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// initial drawing</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">clearColor</span><span class="ct-64281f">(</span><span class="ct-a52b15">0.0</span><span class="ct-64281f">, </span><span class="ct-a52b15">0.0</span><span class="ct-64281f">, </span><span class="ct-a52b15">0.0</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">enable</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">DEPTH_TEST</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">clear</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">COLOR_BUFFER_BIT</span><span class="ct-64281f"> </span><span class="ct-1b92cf">|</span><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">DEPTH_BUFFER_BIT</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">viewport</span><span class="ct-64281f">(</span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span><span class="ct-86a21d">width</span><span class="ct-64281f">, </span><span class="ct-86a21d">height</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// bind squareVertexBuffer as vertex positions buffer</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bindBuffer</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ARRAY_BUFFER</span><span class="ct-64281f">, </span><span class="ct-86a21d">squareVertexBuffer</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// send every 3 bytes from squareVertexBuffer as {x,y,z} for each verticle</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">vertexAttribPointer</span><span class="ct-64281f">(</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">getAttribLocation</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">, </span><span class="ct-d37380">"aVertexPosition"</span><span class="ct-64281f">), </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">3</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// 3 bytes-long</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">FLOAT</span><span class="ct-64281f">,</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-f2374f">false</span><span class="ct-64281f">, </span><span class="ct-adcfc5">// don't normalize (int to float)</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">0</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">0</span></span><span class="line"><span class="ct-64281f"> );</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// send vertice buffer as `aVertexPosition` attribute inside vertex shader</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">enableVertexAttribArray</span><span class="ct-64281f">(</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">getAttribLocation</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">, </span><span class="ct-d37380">"aVertexPosition"</span><span class="ct-64281f">)</span></span><span class="line"><span class="ct-64281f"> );</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">let</span><span class="ct-64281f"> </span><span class="ct-86a21d">i</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-a52b15">0</span><span class="ct-64281f">;</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">let</span><span class="ct-64281f"> </span><span class="ct-86a21d">speed</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-a52b15">0.01</span><span class="ct-64281f">;</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// that's the main rendering callback</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">return</span><span class="ct-64281f"> () </span><span class="ct-e04d55">=></span><span class="ct-64281f"> {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">useProgram</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">scale</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">i</span><span class="ct-64281f"> </span><span class="ct-1b92cf">*</span><span class="ct-64281f"> </span><span class="ct-64281f"> </span><span class="ct-a52b15">0.25</span><span class="ct-64281f">;</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// used for scaling inside Vertex Shader</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">uniform1f</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">getUniformLocation</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">, </span><span class="ct-d37380">"slide"</span><span class="ct-64281f">), </span><span class="ct-86a21d">scale</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// GL Screen is square, so we need to fix it's aspect ration</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">uniform1f</span><span class="ct-64281f">(</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">getUniformLocation</span><span class="ct-64281f">(</span><span class="ct-86a21d">prg</span><span class="ct-64281f">, </span><span class="ct-d37380">"aspect"</span><span class="ct-64281f">), </span><span class="ct-86a21d">height</span><span class="ct-64281f"> </span><span class="ct-1b92cf">/</span><span class="ct-64281f"> </span><span class="ct-86a21d">width</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">bindBuffer</span><span class="ct-64281f">(</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">ELEMENT_ARRAY_BUFFER</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">squareIndexBuffer</span></span><span class="line"><span class="ct-64281f"> );</span></span><span class="line"><span class="ct-64281f"> </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">drawElements</span><span class="ct-64281f">(</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">TRIANGLES</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">indices</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">UNSIGNED_SHORT</span><span class="ct-64281f">, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-a52b15">0</span><span class="ct-64281f">,</span></span><span class="line"><span class="ct-64281f"> );</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">if</span><span class="ct-64281f"> (</span><span class="ct-86a21d">i</span><span class="ct-64281f"> </span><span class="ct-1b92cf">></span><span class="ct-64281f"> </span><span class="ct-1b92cf">||</span><span class="ct-64281f"> </span><span class="ct-a52b15">0</span><span class="ct-64281f">) {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">speed</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-1b92cf">-</span><span class="ct-86a21d">speed</span><span class="ct-64281f">;</span></span><span class="line"><span class="ct-64281f"> }</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">i</span><span class="ct-64281f"> </span><span class="ct-1b92cf">+=</span><span class="ct-64281f"> </span><span class="ct-86a21d">speed</span><span class="ct-64281f">;</span></span><span class="line"><span class="ct-64281f"> };</span></span><span class="line"><span class="ct-64281f">};</span></span></code></pre><!--]--></div><h2 id="shader-compiler"><a href="#shader-compiler"><!--[-->Shader compiler<!--]--></a></h2><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-adcfc5">// create-shader.ts</span></span><span class="line"><span class="ct-1b92cf">export</span><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-76004f">createShader</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> (</span></span><span class="line"><span class="ct-65b1d0"> </span><span class="ct-7a9410">gl</span><span class="ct-b7f1ad">:</span><span class="ct-65b1d0"> </span><span class="ct-6e3c4d">WebGL2RenderingContext</span><span class="ct-65b1d0">,</span></span><span class="line"><span class="ct-65b1d0"> </span><span class="ct-7a9410">sourceCode</span><span class="ct-b7f1ad">:</span><span class="ct-65b1d0"> </span><span class="ct-758bcb">string</span><span class="ct-65b1d0">,</span></span><span class="line"><span class="ct-65b1d0"> </span><span class="ct-7a9410">type</span><span class="ct-b7f1ad">:</span><span class="ct-65b1d0"> </span><span class="ct-758bcb">number</span><span class="ct-65b1d0">, </span><span class="ct-d41173">// gl.VERTEX_SHADER or gl.FRAGMENT_SHADER</span></span><span class="line"><span class="ct-64281f">) </span><span class="ct-e04d55">=></span><span class="ct-64281f"> {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">shader</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">createShader</span><span class="ct-64281f">(</span><span class="ct-86a21d">type</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">if</span><span class="ct-64281f"> (</span><span class="ct-1b92cf">!</span><span class="ct-86a21d">shader</span><span class="ct-64281f">) {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">throw</span><span class="ct-64281f"> </span><span class="ct-1b92cf">new</span><span class="ct-64281f"> </span><span class="ct-b615da">Error</span><span class="ct-64281f">(</span><span class="ct-d37380">`Can't init shader`</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> }</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">shaderSource</span><span class="ct-64281f">(</span><span class="ct-86a21d">shader</span><span class="ct-64281f">, </span><span class="ct-86a21d">sourceCode</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">compileShader</span><span class="ct-64281f">(</span><span class="ct-86a21d">shader</span><span class="ct-64281f">);</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">if</span><span class="ct-64281f"> (</span><span class="ct-1b92cf">!</span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">getShaderParameter</span><span class="ct-64281f">(</span><span class="ct-86a21d">shader</span><span class="ct-64281f">, </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-7e145c">COMPILE_STATUS</span><span class="ct-64281f">)) {</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-e04d55">const</span><span class="ct-64281f"> </span><span class="ct-7e145c">info</span><span class="ct-64281f"> </span><span class="ct-1b92cf">=</span><span class="ct-64281f"> </span><span class="ct-86a21d">gl</span><span class="ct-64281f">.</span><span class="ct-76004f">getShaderInfoLog</span><span class="ct-64281f">(</span><span class="ct-86a21d">shader</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">throw</span><span class="ct-64281f"> </span><span class="ct-d37380">`Could not compile WebGL program. </span><span class="ct-9bc03d">\n\n</span><span class="ct-d37380">${</span><span class="ct-86a21d">info</span><span class="ct-d37380">}`</span><span class="ct-64281f">;</span></span><span class="line"><span class="ct-64281f"> }</span></span><span class="line"></span><span class="line"><span class="ct-64281f"> </span><span class="ct-1b92cf">return</span><span class="ct-64281f"> </span><span class="ct-86a21d">shader</span><span class="ct-64281f">;</span></span><span class="line"><span class="ct-64281f">};</span></span></code></pre><!--]--></div><h2 id="vertex-shader-example"><a href="#vertex-shader-example"><!--[-->Vertex Shader Example<!--]--></a></h2><p><!--[-->Read more at <a href="/frontend/webgl/vertex-shaders" class=""><!--[-->Vertex Shaders<!--]--></a><!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>c</span></button><!--[--><pre><code><span class="line"><span class="ct-adcfc5">// current vertice position {x,y,z,w}</span></span><span class="line"><span class="ct-64281f">attribute vec4 aVertexPosition;</span></span><span class="line"><span class="ct-adcfc5">// final vertice position with all transformations applied,</span></span><span class="line"><span class="ct-adcfc5">// that will be passed to Fragment Shader</span></span><span class="line"><span class="ct-64281f">varying vec4 v_positionWithOffset;</span></span><span class="line"><span class="ct-adcfc5">// Parameters passed from Javascript loop</span></span><span class="line"><span class="ct-64281f">uniform </span><span class="ct-e04d55">float</span><span class="ct-64281f"> slide;</span></span><span class="line"><span class="ct-64281f">uniform </span><span class="ct-e04d55">float</span><span class="ct-64281f"> aspect;</span></span><span class="line"></span><span class="line"><span class="ct-e04d55">void</span><span class="ct-64281f"> </span><span class="ct-76004f">main</span><span class="ct-64281f">(){</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// float array of 4 elements, same as [slide,slide,slide,1]</span></span><span class="line"><span class="ct-64281f"> vec4 scale</span><span class="ct-1b92cf">=</span><span class="ct-76004f">vec4</span><span class="ct-64281f">(</span><span class="ct-76004f">vec3</span><span class="ct-64281f">(slide),</span><span class="ct-a52b15">1</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// float array of 4 elements, same as [aspect,1,1,1]</span></span><span class="line"><span class="ct-64281f"> vec4 aspectRatioFix</span><span class="ct-1b92cf">=</span><span class="ct-76004f">vec4</span><span class="ct-64281f">(aspect,</span><span class="ct-76004f">vec3</span><span class="ct-64281f">(</span><span class="ct-a52b15">1</span><span class="ct-64281f">));</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// vertice position, multiplied with matrices of scale and aspect ratio</span></span><span class="line"><span class="ct-64281f"> gl_Position</span><span class="ct-1b92cf">=</span><span class="ct-64281f">aVertexPosition</span><span class="ct-1b92cf">*</span><span class="ct-64281f">scale</span><span class="ct-1b92cf">*</span><span class="ct-64281f">aspectRatioFix,</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// vertice offset, that will be passed to fragment shader</span></span><span class="line"><span class="ct-64281f"> v_positionWithOffset</span><span class="ct-1b92cf">=</span><span class="ct-64281f">gl_Position</span><span class="ct-1b92cf">+</span><span class="ct-76004f">vec4</span><span class="ct-64281f">(</span><span class="ct-a52b15">1</span><span class="ct-64281f">,</span><span class="ct-a52b15">1</span><span class="ct-64281f">,</span><span class="ct-a52b15">1</span><span class="ct-64281f">,</span><span class="ct-a52b15">1</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f">}</span></span></code></pre><!--]--></div><h2 id="fragment-shader-example"><a href="#fragment-shader-example"><!--[-->Fragment Shader Example<!--]--></a></h2><p><!--[-->Read more at <a href="/frontend/webgl/fragment-shaders" class=""><!--[-->Fragment Shaders<!--]--></a>.<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>c</span></button><!--[--><pre><code><span class="line"><span class="ct-64281f">precision highp </span><span class="ct-e04d55">float</span><span class="ct-64281f">;</span></span><span class="line"></span><span class="line"><span class="ct-adcfc5">// parameter from Vertex Shader</span></span><span class="line"><span class="ct-64281f">varying vec4 v_positionWithOffset;</span></span><span class="line"></span><span class="line"><span class="ct-e04d55">void</span><span class="ct-64281f"> </span><span class="ct-76004f">main</span><span class="ct-64281f">(</span><span class="ct-e04d55">void</span><span class="ct-64281f">){</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// color, attached to current verticle {r,g,b,alpha}</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// same a[</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// v_positionWithOffset.x,</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// v_positionWithOffset.y, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// v_positionWithOffset.z, </span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// 1</span></span><span class="line"><span class="ct-64281f"> </span><span class="ct-adcfc5">// ]</span></span><span class="line"><span class="ct-64281f"> gl_FragColor</span><span class="ct-1b92cf">=</span><span class="ct-76004f">vec4</span><span class="ct-64281f">(</span><span class="ct-86a21d">v_positionWithOffset</span><span class="ct-64281f">.</span><span class="ct-86a21d">xyz</span><span class="ct-64281f">,</span><span class="ct-a52b15">1</span><span class="ct-64281f">);</span></span><span class="line"><span class="ct-64281f">}</span></span></code></pre><!--]--></div><style>.ct-9bc03d{color:#79C0FF}.ct-d41173{color:#8B949E}.ct-f2374f{color:#79C0FF}.ct-b615da{color:#79C0FF}.ct-a52b15{color:#79C0FF}.ct-758bcb{color:#79C0FF}.ct-6e3c4d{color:#FFA657}.ct-b7f1ad{color:#FF7B72}.ct-7a9410{color:#FFA657}.ct-65b1d0{color:#C9D1D9}.ct-76004f{color:#D2A8FF}.ct-7e145c{color:#79C0FF}.ct-e04d55{color:#FF7B72}.ct-d37380{color:#A5D6FF}.ct-86a21d{color:#C9D1D9}.ct-64281f{color:#C9D1D9}.ct-1b92cf{color:#FF7B72}.ct-adcfc5{color:#8B949E}.light .ct-adcfc5{color:#93A1A1}.light .ct-1b92cf{color:#859900}.light .ct-64281f{color:#657B83}.light .ct-86a21d{color:#268BD2}.light .ct-d37380{color:#2AA198}.light .ct-e04d55{color:#073642}.light .ct-7e145c{color:#268BD2}.light .ct-76004f{color:#268BD2}.light .ct-65b1d0{color:#657B83}.light .ct-7a9410{color:#657B83}.light .ct-b7f1ad{color:#859900}.light .ct-6e3c4d{color:#268BD2}.light .ct-758bcb{color:#859900}.light .ct-a52b15{color:#D33682}.light .ct-b615da{color:#859900}.light .ct-f2374f{color:#B58900}.light .ct-d41173{color:#93A1A1}.light .ct-9bc03d{color:#CB4B16}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_vom09_18 _footer_vom09_18"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 2023) <a href="https://github.com/muerwre/" rel="noopener noreferrer" target="_blank">muerwre</a></div></footer></div></div></div></div></div><script type="module">import p from "/frontend/webgl/basics-of-webgl-(drawing-a-cube)/_payload.js";window.__NUXT__={...p,...((function(a,b,c,d,e,f){return 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