Upstream GPU xBRZ shader notices
===============================

The GPU implementation identifies libretro slang-shaders'
xbrz-freescale-multipass as its reference. These upstream notices do not
relicense other project files or resolve combined-binary compatibility.

Reviewed upstream:
https://github.com/libretro/slang-shaders/tree/e1d75632a205c70f14a4cc947c46d5abb7b3f7f1/edge-smoothing/xbrz/shaders/xbrz-freescale-multipass
The original port did not record an exact upstream shader revision.
Local adaptation: common Cg/C++ dialect and a three-pass Vita implementation.

Hyllian's xBR-vertex code and texel mapping

Copyright (C) 2011/2016 Hyllian - sergiogdb@gmail.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

The upstream shader also states that it uses code and/or concepts from xBRZ
as it appears in the Desmume source code, with this notice:

This file is part of the HqMAME project. It is distributed under
GNU General Public License: http://www.gnu.org/licenses/gpl-3.0
Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved

Additionally and as a special exception, the author gives permission
to link the code of this program with the MAME library (or with modified
versions of MAME that use the same license as MAME), and distribute
linked combinations including the two. You must obey the GNU General
Public License in all respects for all of the code used other than MAME.
If you modify this file, you may extend this exception to your version
of the file, but you are not obligated to do so. If you do not wish to
do so, delete this exception statement from your version.

The full GPL version 3 text is in GPL-3.0.txt.
