Move libsquish definitions to file

cmake/bimg/3rdparty/libsquish.cmake

@@ -0,0 +1,25 @@
+# bgfx.cmake - bgfx building in cmake
+# Written in 2017 by Joshua Brookover <joshua.al.brookover@gmail.com>
+#
+# To the extent possible under law, the author(s) have dedicated all copyright
+# and related and neighboring rights to this software to the public domain
+# worldwide. This software is distributed without any warranty.
+#
+# You should have received a copy of the CC0 Public Domain Dedication along with
+# this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
+
+# Ensure the directory exists
+if(NOT IS_DIRECTORY ${BIMG_DIR})
+	message(SEND_ERROR "Could not load bimg, directory does not exist. ${BIMG_DIR}")
+	return()
+endif()
+
+if(NOT LIBSQUISH_LIBRARIES)
+	file(
+		GLOB_RECURSE #
+		LIBSQUISH_SOURCES #
+		${BIMG_DIR}/3rdparty/libsquish/**.cpp #
+		${BIMG_DIR}/3rdparty/libsquish/**.h #
+	)
+	set(LIBSQUISH_INCLUDE_DIR ${BIMG_DIR}/3rdparty)
+endif()

cmake/bimg/CMakeLists.txt

@@ -8,6 +8,7 @@
 # You should have received a copy of the CC0 Public Domain Dedication along with
 # this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
 
+include(3rdparty/libsquish.cmake)
 include(3rdparty/miniz.cmake)
 include(bimg.cmake)
 include(bimg_decode.cmake)

cmake/bimg/bimg_encode.cmake

@@ -23,6 +23,7 @@ target_include_directories(
 	bimg_encode
 	PUBLIC $<BUILD_INTERFACE:${BIMG_DIR}/include> $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 	PRIVATE ${BIMG_DIR}/3rdparty #
+			${LIBSQUISH_INCLUDE_DIR} #
 			${BIMG_DIR}/3rdparty/astc-encoder/include #
 			${BIMG_DIR}/3rdparty/iqa/include #
 			${BIMG_DIR}/3rdparty/nvtt #
@@ -35,8 +36,7 @@ file(
 	${BIMG_DIR}/include/* #
 	${BIMG_DIR}/src/image_encode.* #
 	${BIMG_DIR}/src/image_cubemap_filter.* #
-	${BIMG_DIR}/3rdparty/libsquish/**.cpp #
-	${BIMG_DIR}/3rdparty/libsquish/**.h #
+	${LIBSQUISH_SOURCES} #
 	${BIMG_DIR}/3rdparty/edtaa3/**.cpp #
 	${BIMG_DIR}/3rdparty/edtaa3/**.h #
 	${BIMG_DIR}/3rdparty/etc1/**.cpp #
@@ -54,7 +54,10 @@ file(
 
 target_sources(bimg_encode PRIVATE ${BIMG_ENCODE_SOURCES})
 
-target_link_libraries(bimg_encode PUBLIC bx)
+target_link_libraries(
+	bimg_encode PUBLIC bx #
+					   ${LIBSQUISH_LIBRARIES} #
+)
 
 include(CheckCXXCompilerFlag)
 foreach(flag "-Wno-implicit-fallthrough" "-Wno-shadow" "-Wno-shift-negative-value" "-Wno-undef")