Move etc1 to file

cmake/bimg/3rdparty/etc1.cmake

@@ -0,0 +1,22 @@
+# 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 ETC1_LIBRARIES)
+	file(GLOB_RECURSE ETC1_SOURCES ${BIMG_DIR}/3rdparty/etc1/**.cpp #
+		 ${BIMG_DIR}/3rdparty/etc1/**.hpp #
+	)
+	set(ETC1_INCLUDE_DIR ${BIMG_DIR}/3rdparty)
+endif()

cmake/bimg/CMakeLists.txt

@@ -11,6 +11,7 @@
 include(3rdparty/loadpng.cmake)
 include(3rdparty/libsquish.cmake)
 include(3rdparty/astc_encoder.cmake)
+include(3rdparty/etc1.cmake)
 include(3rdparty/etc2.cmake)
 include(3rdparty/nvtt.cmake)
 include(3rdparty/pvrtc.cmake)

cmake/bimg/bimg_encode.cmake

@@ -25,6 +25,7 @@ target_include_directories(
 	PRIVATE ${BIMG_DIR}/3rdparty #
 			${LIBSQUISH_INCLUDE_DIR} #
 			${ASTC_ENCODER_INCLUDE_DIR}
+			${ETC1_INCLUDE_DIR}
 			${ETC2_INCLUDE_DIR}
 			${NVTT_INCLUDE_DIR} #
 			${PVRTC_INCLUDE_DIR}
@@ -42,8 +43,7 @@ file(
 	${LIBSQUISH_SOURCES} #
 	${BIMG_DIR}/3rdparty/edtaa3/**.cpp #
 	${BIMG_DIR}/3rdparty/edtaa3/**.h #
-	${BIMG_DIR}/3rdparty/etc1/**.cpp #
-	${BIMG_DIR}/3rdparty/etc1/**.h #
+	${ETC1_SOURCES} #
 	${ETC2_SOURCES} #
 	${NVTT_SOURCES} #
 	${PVRTC_SOURCES} #
@@ -58,6 +58,7 @@ target_link_libraries(
 	PUBLIC bx #
 		   ${LIBSQUISH_LIBRARIES} #
 		   ${ASTC_ENCODER_LIBRARIES} #
+		   ${ETC1_LIBRARIES} #
 		   ${ETC2_LIBRARIES} #
 		   ${NVTT_LIBRARIES}
 		   ${PVRTC_LIBRARIES} #