http://clemz.io/article-retro-shaders-webgl.html
https://docs.google.com/presentation/d/1NMhx4HWuNZsjNRRlaFOu2ysjo04NgcpFlEhzodE8Rlg/edit#slide=id.g423da70889_217_0
https://docs.google.com/presentation/d/12RrqyAkFanKmfL96ZHvhDCozE-_rKFPlU1YVwej4_bc/edit#slide=id.g3ffec6a8a1_0_4
https://thebookofshaders.com/?lan=jp
https://ics.media/entry/5535

https://github.com/fand/veda-toplapjp02
https://github.com/glslify/glsl-easings