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That is, our PRNG algorithm is so stupid that sometimes it cycles into
the same value multiple times. While play testing, sometimes we were so
unlucky that we got all enemies on the same Y screen coordinate.
As funny as these situations can be, this shouldn't happen, so I have
introduced an (awesomely named) function that makes a harder effort at
finding a unique random number.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
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Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
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This way enemies are a bit more off from the boundaries, avoiding
visually distracting scenarios.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
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For now only the basic algorithm has been written, but the framework for
adding the rest has also been written down.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
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And also run rubocop on the CI for good measure.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
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This function relies on a pre-computed table to get the "random" numbers
from, but most of the times this is used, it needs to be between some
safe boundaries.
Before this commit, this was done inside of the function, correcting the
fetched value to be above or below these limits. But there was a bug on
the below the grounds limit, in which the 'sbc' instruction could
subtract too much from the fetched value and make enemies appear below
the sky.
Now, this is easy to correct, but since we are cheating with a
pre-computed table, I thought it would be vastly easier to just get a
random table with the "proper" values. That is, random but within the
required boundaries already. Plus, it makes the
'random_valid_y_coordinate' function much faster.
This commit adds a ruby script in bin/ which produces a pseudo-random
table when called, making sure all the requirements are met. We have to
make sure to call this script if we ever change the boundaries at some
point.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
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The randomness comes from a pre-computed table of "random" numbers. This
is of course the most simple technique you can come across a code base
for the NES/Famicom, but for the purposes of this game is good enough
and (most importantly) fast.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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