_MainTex_TexelSize https://forum.unity3d.com/threads/_maintex_texelsize-whats-the-meaning.110278/
https://docs.unity3d.com/Manual/SL-PropertiesInPrograms.html
About accessing pixels in shader: http://answers.unity3d.com/questions/1036262/shaders-offset-texture-coordinates-by-a-single-pix.html?childToView=1036347#answer-1036347
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