Fix fragment shader position references #141
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Fragment Shaders > The Basics states that `xy` coordinates are relative to the top-left of the buffer. Really, they default to the bottom-left. From [OpenGL](https://www.opengl.org/sdk/docs/man/html/gl_FragCoord.xhtml): > By default, gl_FragCoord assumes a lower-left origin for window coordinates and assumes pixel centers are located at half-pixel centers. For example, the (x, y) location (0.5, 0.5) is returned for the lower-left-most pixel in a window. The origin of gl_FragCoord may be changed by redeclaring gl_FragCoord with the origin_upper_left identifier.
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Fragment Shaders: The Basics states that
xycoordinates are relative to the top-left of the buffer. Really, they default to the bottom-left. From OpenGL: