Landon Curt Noll
f07fec3a98
Eliminated the need for the `.tar.tstamp` files. It became intractable
to produce a tarball that was byte-for-byte identical to a tarball
on another platform. We further simplified the process used by the
`bin/tar-year.sh` tool to no longer need `.tar.tstamp` files.
Removed `.tar.tstamp` files and updated the manifest.
Sorry (tm Canada 🇨🇦) for the "flip-flop".
The `bin/tar-year.sh` tool now uses a similar algorithm to how
`bin/tar-entry.sh` determines if a compressed tarball needs to be
rebuilt.
Changed `bin/tar-entry.sh` VERSION from "1.3.3 2024-03-27"
to "1.3.4 2024-03-27".
Changed `bin/tar-year.sh` VERSION from "1.1.3 2024-03-27"
to "1.2 2024-03-27".
Performed `make www` and `make form_entry_tarball`
and `make form_year_tarball` to complete the above
actions and test these changes under macOS.
TODO: Test the `bin/tar-year.sh` tool under Linux.
TODO: Address issues with building the top level `ioccc.tar.bz2`
and the `bin/tar-all.sh` tool and the `make form_all_tarball` rule.
NOTE: The `bin/tar-all.sh` tool and the `make form_all_tarball` rule
and the `make tar` should **NOT** be used at this time.
To build:
This entry requires SDL2 to be installed. See FAQ 3.8: How do I compile an IOCCC entry that requires SDL1 or SDL2? if you don't have it installed and don't know how to do so.
make
To use:
./prog
Try:
./prog ioccc.txt
./prog prog.c
./prog sand.txt
./prog sand.alt.txt
NOTE: these invocations will take quite some time to finish.
Judges' remarks:
Can you explain the behavior of the program when ioccc.txt is given to it as input?
How would the description of the state machine look like when translated from Polynomish to English?
Author's remarks:
Remarks
This entry graphically displays a simulation of sand falling. It uses SDL to draw the interface.
The code makes the following assumptions about the underlying system:
- SDL2 is installed from https://libsdl.org or your package manager.
doubleis an IEEE 754 floating-point type andsizeof(double)==8.- The compiler supports the C99 standard.
In order to simulate the motion of the sand, a cellular automaton is used. The
state transition table is not stored directly. Instead, the program stores the
coefficients of a polynomial that map each state to the correct one. These
coefficients are stored as raw hexadecimal in the V[] array, and they are
reinterpreted as doubles when used. This allows more numeric precision in fewer
characters (base 16 > base 10), and makes the purpose of the array less clear.
The code is laid out graphically as a bucket pouring sand, and it is far easier to observe this high-level layout than the code's actual function.
The preprocessor is used to both obfuscate the code as a whole and abbreviate the calls to SDL. Additionally, throughout the code, the variables were named so that they are short and easily confused with each other.