adding flatpak manifest + patch to create flatpak application

dust3d.pro.flatpak.patch

@@ -0,0 +1,25 @@
+--- dust3d/dust3d.pro	2020-04-07 10:42:08.246213390 -0400
++++ dust3d/dust3d.pro.flatpak	2020-04-14 13:20:11.609396245 -0400
+@@ -881,14 +881,14 @@
+ 	GMP_LIBNAME = gmp
+ 	MPFR_LIBNAME = mpfr
+ 	CGAL_LIBNAME = CGAL
+-	BOOST_INCLUDEDIR = /usr/local/include
+-	CGAL_INCLUDEDIR = /usr/local/include
+-	CGAL_BUILDINCLUDEDIR = /usr/local/include
+-	CGAL_LIBDIR = /usr/local/lib
+-	GMP_INCLUDEDIR = /usr/local/include
+-	GMP_LIBDIR = /usr/local/lib
+-	MPFR_INCLUDEDIR = /usr/local/include
+-	MPFR_LIBDIR = /usr/local/lib
++	BOOST_INCLUDEDIR = /app/include
++	CGAL_INCLUDEDIR = /app/include
++	CGAL_BUILDINCLUDEDIR = /app/include
++	CGAL_LIBDIR = /app/lib
++	GMP_INCLUDEDIR = /app/include
++	GMP_LIBDIR = /app/lib
++	MPFR_INCLUDEDIR = /app/include
++	MPFR_LIBDIR = /app/lib
+ }
+ 
+ INCLUDEPATH += $$BOOST_INCLUDEDIR

org.dust3d.dust3d.json

@@ -0,0 +1,78 @@
+{
+    "app-id": "org.dust3d.dust3d",
+    "runtime": "org.kde.Platform",
+    "runtime-version": "5.13",
+    "sdk": "org.kde.Sdk",
+    "branch": "stable",
+    "command": "dust3d",
+    "finish-args": [
+        "--share=ipc",
+        "--socket=x11",
+        "--socket=wayland",
+        "--device=dri"
+    ],
+    "modules": [
+        {
+            "name": "boost",
+            "buildsystem": "simple",
+            "build-commands": [
+                "./bootstrap.sh --prefix=/app",
+                "./b2 -j $FLATPAK_BUILDER_N_JOBS",
+                "./b2 install"
+            ],
+            "cleanup": [ "/lib/libboost_*.a" ],
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://downloads.sourceforge.net/project/boost/boost/1.63.0/boost_1_63_0.tar.bz2",
+                    "sha256": "beae2529f759f6b3bf3f4969a19c2e9d6f0c503edcb2de4a61d1428519fcb3b0"
+                }
+            ]
+        },
+        {
+            "name": "mpfr",
+            "buildsystem": "autotools",
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://www.mpfr.org/mpfr-current/mpfr-4.0.2.tar.gz",
+                    "sha256": "ae26cace63a498f07047a784cd3b0e4d010b44d2b193bab82af693de57a19a78"
+                }
+            ]
+        },
+        {
+            "name": "cgal",
+            "buildsystem": "cmake",
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://github.com/CGAL/cgal/archive/releases/CGAL-4.14.3.tar.gz",
+                    "sha256": "05badca4025ec85012942533f5f1af6314ae10ce2f7effcc094b6844c4a54985"
+                }
+            ]
+        },
+        {
+            "name": "dust3d",
+            "buildsystem": "simple",
+            "build-commands": [
+                "mkdir -p thirdparty/instant-meshes/build",
+                "cd thirdparty/instant-meshes/build && cmake ../",
+                "cd thirdparty/instant-meshes/build && make -j 4",
+                "qmake -config release",
+                "make CXX=\"g++ -fext-numeric-literals\"",
+                "install -D dust3d /app/bin/dust3d"
+            ],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://github.com/huxingyi/dust3d.git",
+                    "tag": "1.0.0-rc.3"
+                },
+                {
+                    "type": "patch",
+                    "path": "dust3d.pro.flatpak.patch"
+                }
+            ]
+        }
+    ]
+}