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DarkBASIC Discussion / Bitwise User-Defined Types

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Libervurto

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Joined: 30th Jun 2006

Location: On Toast

Posted: 10th Jun 2013 02:15

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This is just a concept, I don't think it's very practical in this form because it's probably slow and memory is limited, but I think there is potential for adding functionality to DBC using this kind of bit manipulation.

+ Code Snippet

p0 = assignVert(100,120)
print "P0x = "; Px(p0)
print "P0y = "; Py(p0)
print

p1 = assignVert(4,6)
print "P1x = "; Px(p1)
print "P1y = "; Py(p1)
print

p2 = multiplyVerts(p0,p1)
print "P2 = P0 * P1"
print "P2x = "; Px(p2)
print "P2y = "; Py(p2)

end

function Px(p)
endfunction p&65535

function Py(p)
   y = (p&4294901761) / 65536
endfunction y

function assignVert(x,y)
   v = x + y*65536
endfunction v

function multiplyVerts(p0,p1)
   p = (p0&65535) * (p1&65535) + (p0&4294901761) * (p1&4294901761) / 65536
endfunction p

The difficulty in learning is not acquiring new knowledge but relinquishing the old.

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Latch

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Joined: 23rd Jul 2006

Location:

Posted: 10th Jun 2013 08:41

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Interesting. Back in the 8 bit computing days, I remember one of the techniques for storing the frequencies, volumes, and modulations for music was to store them in a single 16 or 32 bit value and use bit shifting and masking to pull out the individual components. With vertices, it might be a little difficult because there could be a lot of floating point values - though those could be handled with a multiplication by a power of 10 value.

Enjoy your day.

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DarkBASIC Discussion / Bitwise User-Defined Types