add find scripts

add cmake find modules.

CMakeLists.txt

@@ -28,6 +28,7 @@ set(TORQUE_SOURCE_DIRECTROY "${CMAKE_SOURCE_DIR}/Engine/source")
 # Ensure all possible configurations end up in the project directory
 set(CMAKE_INSTALL_PREFIX "${TORQUE_APP_ROOT_DIRECTORY}" CACHE STRING "" FORCE)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${TORQUE_APP_GAME_DIRECTORY}")
+set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/Tools/CMake/finders")
 foreach( OUTPUTCONFIG ${CMAKE_CONFIGURATION_TYPES} )
     string( TOUPPER ${OUTPUTCONFIG} OUTPUTCONFIG )
     set( CMAKE_RUNTIME_OUTPUT_DIRECTORY_${OUTPUTCONFIG} "${TORQUE_APP_GAME_DIRECTORY}" )

Engine/lib/CMakeLists.txt

@@ -6,8 +6,6 @@ set(ZLIB_ROOT "${ZLIB_ROOT}" CACHE STRING "ZLib root location" FORCE)
 mark_as_advanced(ZLIB_ROOT)
 # Png depends on zlib
 add_subdirectory(zlib ${TORQUE_LIB_TARG_DIRECTORY}/zlib EXCLUDE_FROM_ALL)
-set(ZLIB_FOUND 1)
-set(ZLIB_LIBRARIES zlib)
 
 if(APPLE)
     enable_language(OBJC)

Tools/CMake/finders/findFLAC.cmake

@@ -0,0 +1,13 @@
+if(TARGET FLAC)
+  set(FLAC_FOUND TRUE)
+  set(FLAC_INCLUDE_DIRS $<TARGET_PROPERTY:FLAC,INTERFACE_INCLUDE_DIRECTORIES>)
+  set(FLAC_LIBRARIES FLAC)
+
+  # Provide an alias for consistency with modern CMake
+  if(NOT TARGET FLAC::FLAC)
+    add_library(FLAC::FLAC ALIAS FLAC)
+  endif()
+else()
+  set(FLAC_FOUND FALSE)
+  message(FATAL_ERROR "Flac was not added with add_subdirectory before calling find_package(FLAC).")
+endif()

Tools/CMake/finders/findOGG.cmake

@@ -0,0 +1,13 @@
+if(TARGET ogg)
+  set(OGG_FOUND TRUE)
+  set(OGG_INCLUDE_DIRS $<TARGET_PROPERTY:ogg,INTERFACE_INCLUDE_DIRECTORIES>)
+  set(OGG_LIBRARIES ogg)
+
+  # Provide an alias for consistency with modern CMake
+  if(NOT TARGET OGG::OGG)
+    add_library(OGG::OGG ALIAS ogg)
+  endif()
+else()
+  set(OGG_FOUND FALSE)
+  message(FATAL_ERROR "Ogg was not added with add_subdirectory before calling find_package(Ogg).")
+endif()

Tools/CMake/finders/findOPUS.cmake

@@ -0,0 +1,13 @@
+if(TARGET opus)
+  set(OPUS_FOUND TRUE)
+  set(OPUS_INCLUDE_DIRS $<TARGET_PROPERTY:opus,INTERFACE_INCLUDE_DIRECTORIES>)
+  set(OPUS_LIBRARIES opus)
+
+  # Provide an alias for consistency with modern CMake
+  if(NOT TARGET OPUS::OPUS)
+    add_library(OPUS::OPUS ALIAS opus)
+  endif()
+else()
+  set(OPUS_FOUND FALSE)
+  message(FATAL_ERROR "Opus was not added with add_subdirectory before calling find_package(Opus).")
+endif()

Tools/CMake/finders/findVorbis.cmake

@@ -0,0 +1,13 @@
+if(TARGET vorbis)
+  set(VORBIS_FOUND TRUE)
+  set(VORBIS_INCLUDE_DIRS $<TARGET_PROPERTY:vorbis,INTERFACE_INCLUDE_DIRECTORIES>)
+  set(VORBIS_LIBRARIES vorbis)
+
+  # Provide an alias for consistency with modern CMake
+  if(NOT TARGET VORBIS::VORBIS)
+    add_library(VORBIS::VORBIS ALIAS vorbis)
+  endif()
+else()
+  set(VORBIS_FOUND FALSE)
+  message(FATAL_ERROR "Vorbis was not added with add_subdirectory before calling find_package(Vorbis).")
+endif()

Tools/CMake/finders/findZlib.cmake

@@ -0,0 +1,14 @@
+# Ensure zlib has been added before using this module
+if(TARGET zlib)
+  set(ZLIB_FOUND TRUE)
+  set(ZLIB_INCLUDE_DIRS $<TARGET_PROPERTY:zlib,INTERFACE_INCLUDE_DIRECTORIES>)
+  set(ZLIB_LIBRARIES zlib)
+  message(STATUS "Using Torques build of zlib.")
+  # Provide an alias for consistency with modern CMake
+  if(NOT TARGET ZLIB::ZLIB)
+    add_library(ZLIB::ZLIB ALIAS zlib)
+  endif()
+else()
+  set(ZLIB_FOUND FALSE)
+  message(FATAL_ERROR "Zlib was not added with add_subdirectory before calling find_package(ZLIB).")
+endif()