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<h1 class="post-title">Shader</h1>
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update
2024-03-15 15:38:52 +08:00
上次更新: 2024-03-15 14:44:57
update
2024-01-23 13:09:40 +08:00
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<h1 id="坐标系"><a href="#坐标系" class="headerlink" title="坐标系"></a>坐标系</h1><h2 id="常规屏幕坐标系"><a href="#常规屏幕坐标系" class="headerlink" title="常规屏幕坐标系"></a>常规屏幕坐标系</h2><p>范围：从 (0,0) 开始到 (屏幕宽度-1, 屏幕高度-1)。对于4k显示器来说，就是有3840x2160个像素</p>
<ul>
<li>原点位置：左上角。</li>
<li>X轴方向：水平向右增加。</li>
<li>Y轴方向：垂直向下增加。</li>
</ul>
<h2 id="归一化"><a href="#归一化" class="headerlink" title="归一化"></a>归一化</h2><p>将屏幕归一化，保证图形效果在不同尺寸和分辨率的屏幕上保持一致，<code>gl_FragCoord</code>是当前像素的位置，举个例子，理解这个渲染过程：</p>
<ul>
<li><p><code>gl_FragCoord</code>：这就像是你正在查看其中一张小照片，并且知道它在大照片中的确切位置。<code>gl_FragCoord.xy</code> 给出的是当前这张小照片（或者说屏幕上的一个像素）在整个大照片（即屏幕）中的位置坐标。</p>
</li>
<li><p><code>iResolution.xy</code>：这是告诉你大照片的总大小，也就是屏幕的分辨率。对于 4K 显示器，这个值是 3840x2160。</p>
</li>
<li><p><code>gl_FragCoord/iResolution.xy</code>：现在，如果你想知道这张小照片（像素）在大照片（屏幕）中的相对位置，你可以将小照片的位置<code>gl_FragCoord.xy</code> 除以大照片的总大小<code>iResolution.xy</code>。这样做的结果是，无论大照片有多大，你都能得到一个介于 0 到 1 之间的比例值，表示这张小照片在大照片中的相对位置。</p>
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<h2 id="step-阶跃函数"><a href="#step-阶跃函数" class="headerlink" title="step 阶跃函数"></a>step 阶跃函数</h2><p>对每个分量独立计算的，每个分量的比较结果独立决定</p>
<ul>
<li>如果 st.x &gt;&#x3D; 0.1，则 bl.x 为 1.0；如果 st.x &lt; 0.1，则 bl.x 为 0.0。</li>
<li>如果 st.y &gt;&#x3D; 0.1，则 bl.y 为 1.0；如果 st.y &lt; 0.1，则 bl.y 为 0.0。</li>
</ul>
<pre class="line-numbers language-glsl" data-language="glsl"><code class="language-glsl"><span class="token keyword">vec2</span> bl <span class="token operator">=</span> <span class="token function">step</span><span class="token punctuation">(</span><span class="token keyword">vec2</span><span class="token punctuation">(</span><span class="token number">0.1</span><span class="token punctuation">)</span><span class="token punctuation">,</span> st<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
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<p class="motto">重拾纯粹的写作</p>
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<span>目录</span>
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<ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%9D%90%E6%A0%87%E7%B3%BB"><span class="toc-number">1.</span> <span class="toc-text">坐标系</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%B8%B8%E8%A7%84%E5%B1%8F%E5%B9%95%E5%9D%90%E6%A0%87%E7%B3%BB"><span class="toc-number">1.1.</span> <span class="toc-text">常规屏幕坐标系</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%BD%92%E4%B8%80%E5%8C%96"><span class="toc-number">1.2.</span> <span class="toc-text">归一化</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#step-%E9%98%B6%E8%B7%83%E5%87%BD%E6%95%B0"><span class="toc-number">1.3.</span> <span class="toc-text">step 阶跃函数</span></a></li></ol></li></ol>
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