GLSL Anti-aliased Step Function

glsl-aastep is a GLSL utility function designed to provide anti-aliased edges for smoothstep-like operations within shaders. It leverages the `GL_OES_standard_derivatives` extension to calculate fragment derivatives, enabling resolution-independent smoothing of transitions across a single pixel width, regardless of magnification. If the extension is unavailable, it gracefully degrades to a standard `step()` function, losing the anti-aliasing effect. The package is currently at version 1.0.1 and appears to be stable, with updates released infrequently as it provides a focused, atomic GLSL function. Its primary differentiation lies in its direct application of standard derivatives for efficient and robust edge smoothing in 2D and 3D rendering contexts, avoiding more complex multi-pass techniques.