miniaudio/resources/format_conversions.txt

# The worlds worst programming language!
#
# The final result needs to be moved to the "r" variable. The input sample is "x".
#
# Instructions
# ============
# add [output] [a] [b] -> output = a + b
# sub [output] [a] [b] -> output = a - b
# mul [output] [a] [b] -> output = a * b
# div [output] [a] [b] -> output = a / b
# shl [output] [a] [b] -> output = a << b
# shr [output] [a] [b] -> output = a >> b
# sig [output] [b]     -> output = (sign bit in "a" is set) ? 1 : 0
# mov [output] [a]     -> output = a;
#
# int [name] -> Declare an uninitialized 32-bit integer
# flt [name] -> Declare an uninitialized 32-bit float

# r = (x - 128) << 8
u8->s16 {
    sub r x 128;
    shl r r 8;
}

# r = (x - 128) << 16
u8->s24 {
    sub r x 128;
    shl r r 16;
}

# r = (x - 128) << 24
u8->s32 {
    sub r x 128;
    shl r r 24;
}

# r = (x / 255) * 2 - 1
u8->f32 {
    div r x 255.0;
    mul r r 2;
    sub r r 1;
}


# r = x / (2147483647 + sign(x))
u32->f32 {
    int s;
    sig s x;
    add s s 2147483647;
    div r x (flt)s;
}