lass="section">Variables</h3><div class="fields"><div class="field "><a name="alpha"></a><h3 class="anchor"><code><span class="label label-meta label-meta-keep" title="Causes a field or type to be kept by DCE.">@:keep</span><a href="#alpha"><span class="identifier">alpha</span></a>:<a class="type" title="openfl.display.ShaderParameter - TODO: Document GLSL Shaders A ShaderParameter instance represents a single input parameter of a shader kernel." href="../../../openfl/display/ShaderParameter.html">ShaderPar