BUILD: Add vpx finder script for cmake

cmake/FindVPX.cmake

@@ -0,0 +1,62 @@
+# xoreos - A reimplementation of BioWare's Aurora engine
+#
+# xoreos is the legal property of its developers, whose names
+# can be found in the AUTHORS file distributed with this source
+# distribution.
+#
+# xoreos is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 3
+# of the License, or (at your option) any later version.
+#
+# xoreos is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with xoreos. If not, see <http://www.gnu.org/licenses/>.
+
+# Try to find vpx library and include path.
+# Once done this will define
+#
+# VPX_INCLUDE_DIRS - where to find vorbis/vorbisfile.h, etc.
+# VPX_LIBRARIES - List of libraries when using libvorbisfile.
+# VPX_FOUND - True if libvorbisfile found.
+
+if(WIN32)
+    find_path(VPX_INCLUDE_DIR vpx/vpx_decoder.h $ENV{PROGRAMFILES}/vpx/include DOC "The directory where vpx/vpx_decoder.h resides")
+    find_library(VPX_LIBRARY NAMES vpx PATHS $ENV{PROGRAMFILES}/vpx/lib DOC "The libvpx library")
+
+else(WIN32)
+    find_path(VPX_INCLUDE_DIR vpx/vpx_decoder.h DOC "The directory where vpx/vpx_decoder.h resides")
+    find_library(VPX_LIBRARY NAMES vpx DOC "The libvpx library")
+
+endif(WIN32)
+
+if(VPX_INCLUDE_DIR AND VPX_LIBRARY)
+    set(VPX_FOUND 1)
+    set(VPX_LIBRARIES ${VPX_LIBRARY} ${VPXFILE_LIBRARY})
+    set(VPX_INCLUDE_DIRS ${VPX_INCLUDE_DIR})
+else(VPX_INCLUDE_DIR AND VPX_LIBRARY AND VPXFILE_LIBRARY)
+    set(VPX_FOUND 0)
+    set(VPX_LIBRARIES)
+    set(VPX_INCLUDE_DIRS)
+endif(VPX_INCLUDE_DIR AND VPX_LIBRARY)
+
+mark_as_advanced(VPX_INCLUDE_DIR)
+mark_as_advanced(VPX_LIBRARY)
+mark_as_advanced(VPX_FOUND)
+
+if(NOT VPX_FOUND)
+    set(VPX_DIR_MESSAGE "libvpx was not found. Make sure VPX_LIBRARY and VPX_INCLUDE_DIR are set.")
+    if(NOT VPX_FIND_QUIETLY)
+        message(STATUS "${VPX_DIR_MESSAGE}")
+    else(NOT VPX_FIND_QUIETLY)
+        if(VPX_FIND_REQUIRED)
+            message(FATAL_ERROR "${VPX_DIR_MESSAGE}")
+        endif(VPX_FIND_REQUIRED)
+    endif(NOT VPX_FIND_QUIETLY)
+else(NOT VPX_FOUND)
+    message(STATUS "Found libvpx: ${VPX_LIBRARY}")
+endif(NOT VPX_FOUND)