Add dev-qt from an older version of the gentoo repo

Qt5 has been removed, we restore it since we still use it.

dev-qt/qt3d/Manifest

@@ -0,0 +1,4 @@
+DIST qt3d-everywhere-opensource-src-5.15.16.tar.xz 118265056 BLAKE2B b5a20f20e8f8a1dbb25fa370d5f02b104e2b3b4902f1f58596cd2d0d2a4ddda67dcaaa9ccd865f7474e1b66bb506f5eeb687fbedbc796a1da7ff95b407566ec9 SHA512 bdb13bd73a8b706eae8ad07d506ca21469a138dadb47b604a23ebe4640b593cba1353efa081a51a6d869a3d75e1b2b25c432bc7bc4621991f2fd2f5d18914fc6
+DIST qt3d-everywhere-src-6.8.2.tar.xz 141821364 BLAKE2B f7f6384110bd8808abb2cb17d05e6a2cb2556afb1e630531c08c20ab1b938d9c511264d7eab610b515a62ef7f4c8aed9cfc8a2801e900d163d84bb1f935876e7 SHA512 e873547bb8ed350e146ce081e3c08f5593ad33e977aad1d933089e287826c81033972cb6428c7f54cbee50c438ceab31181f64b99ada77382875b5053f00ca0d
+DIST qt3d-everywhere-src-6.8.3.tar.xz 141825440 BLAKE2B cb3416dc9364c9c90515e56881f5c0cfbcbbbfd0fd56153f24d69ae3789f0a507ce387fbd480cf127c4169c234052cfadc438771a99e65632e069310ad6cdd2a SHA512 8316fbe5a39bc5113da4759e195a55c57d8340021a39576939c0a4a604f47b4edb3c0206f914d4a3177ff09471d1f3475ffc4c2fa935ed8d98a166e310bc78b4
+DIST qt3d-everywhere-src-6.9.0.tar.xz 141826404 BLAKE2B f1a83884aa14d9f08381e1d97e0a0877665aa273d5f5f5927a758096da0939fe0ea47e1907cc8c032e47636cc25d450f86635092a4dc237354a0660dfd10d5d2 SHA512 f4e7d5d2f7615447b2283ff7dd04d9cd21110e854c48271b343e2ed196843c73b72c2649641c30b386b798b1dbab4df6494eb40f7c7b009a9eac921bc39f85ed

dev-qt/qt3d/metadata.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>qt@gentoo.org</email>
+		<name>Gentoo Qt Project</name>
+	</maintainer>
+	<use>
+		<flag name="gamepad">Add support for gamepad hardware via <pkg>dev-qt/qtgamepad</pkg></flag>
+		<flag name="qml">Build QML/QtQuick bindings</flag>
+	</use>
+	<upstream>
+		<bugs-to>https://bugreports.qt.io/</bugs-to>
+		<doc>https://doc.qt.io/</doc>
+		<remote-id type="github">qt/qt3d</remote-id>
+	</upstream>
+	<slots>
+		<subslots>
+			Must only be used by packages that are known to use private parts of the Qt API.
+		</subslots>
+	</slots>
+</pkgmetadata>

dev-qt/qt3d/qt3d-5.15.16.ebuild

@@ -0,0 +1,44 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+if [[ ${PV} != *9999* ]]; then
+	KEYWORDS="amd64 ~arm arm64 ~riscv x86"
+fi
+inherit qt5-build
+
+DESCRIPTION="3D rendering module for the Qt5 framework"
+
+# TODO: tools
+IUSE="gamepad gles2-only qml vulkan"
+
+RDEPEND="
+	=dev-qt/qtconcurrent-${QT5_PV}*
+	=dev-qt/qtcore-${QT5_PV}*
+	=dev-qt/qtgui-${QT5_PV}*:5=[vulkan=]
+	=dev-qt/qtnetwork-${QT5_PV}*
+	>=media-libs/assimp-4.0.0:=
+	gamepad? ( =dev-qt/qtgamepad-${QT5_PV}* )
+	qml? ( =dev-qt/qtdeclarative-${QT5_PV}*[gles2-only=] )
+"
+DEPEND="${RDEPEND}
+	vulkan? ( dev-util/vulkan-headers )
+"
+
+src_prepare() {
+	rm -r src/3rdparty/assimp/src/{code,contrib,include} || die
+
+	qt_use_disable_mod gamepad gamepad src/input/frontend/frontend.pri
+	qt_use_disable_mod qml quick src/src.pro
+
+	qt5-build_src_prepare
+}
+
+src_configure() {
+	local myqmakeargs=(
+		--
+		-system-assimp
+	)
+	qt5-build_src_configure
+}