SDF_018

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***     Live Stream Of Me Working On This Code:      ***
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                twitch.com/kanjicoder

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*** EASY_URLS:(BELOW):- - - - - - - - - - - - - - -: ***
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*** SELF___________URL:  tinyurl.com/SDF-018         ***
*** DOCUMENTATION__URL:  tinyurl.com/SDF-018         ***
*** SOURCE_CODE_BUFFER:  tinyurl.com/SDF-018-BUFFER  ***
*** SOURCE_CODE__IMAGE:  tinyurl.com/SDF-018-IMAGE   ***
*** LIVE__________DEMO:  tinyurl.com/SDF-018-DEMO    ***
*** SETUP________VIDEO:  tinyurl.com/SDF-018-SETUP   ***
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*** DIRECT_URLS:(BELOW):- - - - - - - - - - - - - -: ***
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*** SELF___________URL:  pastebin.com/nkNEKtsN       ***
*** DOCUMENTATION__URL:  pastebin.com/nkNEKtsN       ***
*** SOURCE_CODE_BUFFER:  pastebin.com/bBhCbcMr       ***
*** SOURCE_CODE__IMAGE:  pastebin.com/guzES91G       ***
*** LIVE__________DEMO:  shadertoy.com/view/WsGfDh   ***
*** SETUP________VIDEO:  youtu.be/diF-OTf8SP4        ***
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/** ************************************************ ***

    About: Voxel Engine Work.
        SDF_018 is starting over.
        Threw SDF_017 in the trash.

    AGENDA:
        Store 512 x 512 values worth of tiles
        by splitting the A,R,G,B components of
        of 256x256 buffer.

        Thus each tile value is 1 byte, with
        valid values 0-255.

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/** ************************************************ ***

    rfp : reset_flag_pixel
    rfb : reset_flag__byte (Alpha channel of rfp)
    fcc : frag_Centered_coord
    f_c : frag_coord (Discreet_Integer_Pixel_Value)


AVOID:

    fpc: Looks too much like "percent something..."
         Use "fcc" instead.

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/** ************************************************ ***

    #PIXEL_127_ALPHA####################################

        Bottom Left Corner Pixel [127,127] ALPHA BITS:

        MSB: 1  :  Data Initilialized Bit
             1  :  2D or 3D view of tilemap?
                :  0 : 2D view
                :  1 : 3D view

             1  : ---+
             1  :    |
             1  :    +-- What layer are we on?
             1  :    +-- Number in range:[0 - 63]
             1  :    |   (When 2D view is selected)
        LSB  1  : ---+

    ####################################PIXEL_127_ALPHA#

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