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As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.
For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.
Going forward, all new source files should include a license header.
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Allow everything to be built from the top level directory with just
'make', cleaned with 'make clean', and installed with 'make
install'. Also support these in any particular subdirectory.
Specifying 'make VERBOSE=1' will print each ld/g++/etc. command as
it runs.
Kernel and early host tools (IPCCompiler, etc.) are built as
object.host.o so that they don't conflict with other things built
with the cross-compiler.
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The old implementation of sin() had a very unacceptable amount of
error that was causing a lot of texture perspective issues in Quake.
This has been remedied through the use of the hardware `fsin`
x87 instruction. As has been noted in #246, this instruction is both
very slow, and can become wildly inaccurate for more precise values,
however the current implementation made an incorrect assumption about
applications "will end up writing their own implemtnation anyways",
which is not the case for Quake in Software mode, which relies heavily
on a correct `sin()` and `cos()` function for `R_ScanEdges()`.
Realistically, we should be using something like the CORDIC algorithm
(https://en.wikipedia.org/wiki/CORDIC) or `Taylor Expansion`, however
for now these provides a somewhat accurate result that allows Quake to
run without any texture or geometry issues.
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Ports/.port_include.sh, Toolchain/BuildIt.sh, Toolchain/UseIt.sh
have been left largely untouched due to use of Bash-exclusive
functions and variables such as $BASH_SOURCE, pushd and popd.
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These implementations still don't handle all of the corner cases that
are possible, but at least they are somewhat usable now.
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I though I could just use __builtin_roundf() and __builtin_ceilf() but
it seems like I can't, as they just become calls to roundf and ceilf.
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Path from Anonymous.
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We can't rely on libstdc++ inside LibC or LibM, since these libraries
are part of the Toolchain bringup build.
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Patch from Anonymous.
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Use the x87 fsqrt instruction for that.
We cannot use __builtin_sqrt(), since GCC expands it into
a sqrt() call, so we just loop endlessly.
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We were installing libraries into /Libraries/Root, rather than in /Root.
This made the ports system behave rather unpredictable, since I had old
versions of things in /Root and new versions of things in /Libraries/Root.
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We've been using a per-directory "install.sh" for some time, so let's get
rid of the old way of doing things.
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Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.
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