Remove LibSquish from repository.

Uses CMake to find system LibSquish instead.

CMakeLists.txt

@@ -30,6 +30,13 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES ".*Clang")
     endif()
 endif()
 
+find_package(LibSquish REQUIRED)
+set_package_properties(LibSquish PROPERTIES
+    URL "https://sourceforge.net/projects/libsquish/"
+    DESCRIPTION "DXT Compression library"
+    TYPE REQUIRED
+)
+
 find_package(OpenGL REQUIRED)
 set_package_properties(OpenGL PROPERTIES
     DESCRIPTION "libGL and libGLU libraries"
@@ -64,9 +71,5 @@ include_directories(${OPENGL_INCLUDE_DIR})
 include_directories(${SDL2_INCLUDE_DIRS})
 include_directories(${ZLIB_INCLUDE_DIR})
 
-# 3rd party Squish library for DXT codecs
-include_directories(libsquish)
-add_subdirectory(libsquish)
-
 # The imaginaryMyst application
 add_subdirectory(src)

cmake/FindLibSquish.cmake

@@ -0,0 +1,30 @@
+#################################################
+#
+# Finds the open source DXT Library, Squish
+#
+# https://sourceforge.net/projects/libsquish/
+#
+#
+# Supplies:
+#  LIBSQUISH_FOUND
+#  LIBSQUISH_INCLUDE_DIR
+#  LIBSQUISH_LIBRARIES
+#
+
+# Additional modules
+include(FindPackageHandleStandardArgs)
+include(SelectLibraryConfigurations)
+
+set(LIBSQUISH_PATH CACHE PATH "Path to libSquish installation")
+
+if(LIBSQUISH_PATH)
+	file(TO_CMAKE_PATH ${LIBSQUISH_PATH}/include LIBSQUISH_INC_SEARCH )
+	file(TO_CMAKE_PATH ${LIBSQUISH_PATH}/lib LIBSQUISH_LIB_SEARCH)
+endif(LIBSQUISH_PATH)
+
+find_path(LIBSQUISH_INCLUDE_DIR squish.h PATHS ${LIBSQUISH_INC_SEARCH} DOC "Path containing libSquish header")
+find_library(LIBSQUISH_LIBRARY_RELEASE NAMES squish libsquish PATHS ${LIBSQUISH_LIB_SEARCH} PATH_SUFFIXES lib DOC "Path to libSquish release library")
+find_library(LIBSQUISH_LIBRARY_DEBUG NAMES squishd libsquishd PATHS ${LIBSQUISH_LIB_SEARCH} PATH_SUFFIXES lib DOC "Path to libSquish debug library")
+
+select_library_configurations(LIBSQUISH)
+find_package_handle_standard_args(LibSquish REQUIRED_VARS LIBSQUISH_LIBRARY LIBSQUISH_INCLUDE_DIR)