# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

# This is only notes / partial work and so, if want to try it, copy
# bin/meka and /usr/share/${PN}/* to a single directory and run ./meka

# TODO / issues to look into (likely more, needs audit):
# - segfaults after first run needing to delete GL cache (at least with
#   nvidia, maybe just me? __GL_SHADER_DISK_CACHE=0 works around for nvidia)
# - tiles window and png images display appears corrupted (allegro related?)
# - meka expects to be ran from a _writable_ directory that contains
#   data files (see doins in src_install), writable meka.inp, with ability
#   to save extra files like meka.cfg dump, screenshots, etc.. This makes
#   previously used wrapper.eclass insufficient and file.cpp should
#   preferably be modified, i.e. EmulatorDir to /usr/share/${PN},
#   internal/external_res to ~/.config/${PN}, and copy meka.inp over
#   (MACOSX build does something similar, but well).
# - LICENSE needs revision, see sources.txt
# - test x86, only arch available before and wouldn't hurt not to break it
# Other notes:
# - nasm is referenced but unused, likewise for libpng
# - wall of warnings with gcc11, but it works fwiw
# - makefile appends to CFLAGS, so don't add in emakeargs=
# - sed could be replaced by backport of https://github.com/ocornut/meka/commit/76c6a26
#   to indicate it's fixed upstream
# - maybe should be renamed from mekanix to meka, nix is just to say
#   "meka-linux-version" and mekanix not really referenced anywhere.
#  (unless there's file collision worries)
# - file.cpp is uncomfortable with its use of strcpy that doesn't check
#   bounds, a trend seen across the entire package

inherit desktop toolchain-funcs

MY_PV="${PV/*alpha/}"

DESCRIPTION="SG-1000, SC-3000, SSC, SM3, SMS, GG, COLECO, and OMV emulator"
HOMEPAGE="https://www.smspower.org/meka/"
SRC_URI="https://github.com/ocornut/meka/archive/refs/tags/meka-${MY_PV}.tar.gz"
S="${WORKDIR}/meka-meka-${MY_PV}/meka"

LICENSE="mekanix"
SLOT="0"
KEYWORDS="~amd64 ~x86"

RDEPEND="
	media-libs/allegro:5[X,opengl,png,truetype]
	sys-libs/zlib:="
DEPEND="${RDEPEND}"

src_prepare() {
	default
	sed -i '/^LIB_ALLEG/s/5\.0/5/g' srcs/Makefile || die
}

src_compile() {
	# makefile uses variables loosely, e.g. sets CC=g++
	local emakeargs=(
		CC="$(tc-getCXX)"
		LINKER="$(tc-getCXX) ${LDFLAGS}"
		LIB_PNG=
	)
	CFLAGS="${CXXFLAGS} ${CPPFLAGS}" emake -C srcs "${emakeargs[@]}"
}

src_install() {
	dobin meka
	dodoc ../README.md
	make_desktop_entry meka MEKA applications-games "Game;Emulator;"

	# .txt are used at runtime (help menu), see srcs/file.cpp
	insinto /usr/share/${PN}
	doins -r Data Themes meka.* {compat,multi,changes,debugger}.txt
}