Okay. First Pictogeneis machine: a register based machine. Today we’re going to create a very small language with a small number of registers that can read from the outside world, write colors, and act as temporary variables.
Something like this:
gt? t0 b y x r
add g y x
abs b x
inv t0 g
add r g x
sub t0 b r
mul x r b
abs y x
In each case, the first argument is the output and the rest are inputs. So:
# gt? t0 b y x r
if (b > y) {
t0 = x;
} else {
t0 = r;
}
# add g y x
g = y + x
# abs b x
b = |x|
...
Where x and y are the input point x and y mapped to the range [0, 1]; r, g, b are the output colors in the same range and t{n} are temporary registers just used during the program.
