Graphical Brainfuck

Graphical Brainfuck (GBF) is a esoteric programming language created by juju2143 in Febuary 2017. It is a multi-dimensional extension of Brainfuck that maps each triad of cells to a graphical screen.

Language overview
What would be the tape in normal Brainfuck is a three-dimensional 320x240 array of pixels matching the size of a graphical display, each pixel containing 3 cells for each of the three RGB color components. The programs start at (0,0,R), the commands are mostly the same as in Brainfuck, with the  and   commands moving the pointer along the cells on the X-axis, the R cell of the next pixel going after the B cell and vice-versa, wrapping back to the beginning or the end of the line in a circular fashion. and  similarly wraps around when 0 or 255 are reached.

To move between the lines, GBF introduces an additional command,, which flips between horizontal and vertical modes. In vertical mode,  moves up along the Y-axis instead of left, likewise for   which moves to the pixel below's R cell instead of the right pixel's when the pointer is on a B cell.

GBF does not change the color of the display by itself, instead the  command is used to send each of the three RGB cells of the current pixel at the current pointer position on the screen. In the reference implementation,  is used to wait for a key, but the value isn't written to the cell like   does.

The language can be adapted to run with screen of any size than 320x240 and cells going up to other values than 255 to accomodate for other color spaces such as RGB565 (R and B goes up to 31, G goes up to 63), CMYK (which would require 4 cells/pixel instead of 3 going from 0 to 100) and HSL (H goes from 0 to 359 and S and L goes from 0 to 100), or even monochrome (probably more akin normal brainfuck at this point with a single bit/pixel and  ends up doing the same thing as   as bit flippers,   may still be useful). If the screen is unbounded, the language should be Turing-complete.

Paints screen white
+[[--.>+]@>>>@+]

Implementations
Coming soon