3rdparty: allow system override for miniply, mikktspace, vcglib, opengametools

Give the relocated standalone deps the same tri-state OSSIA_USE_SYSTEM_<pkg>
find path + vendored fallback as the others, instead of vendored-only.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S5akSKFxSnxVz3RtLyU9QN

Author: jcelerier

3rdparty/mikktspace.cmake

@@ -1,3 +1,16 @@
-add_library(mikktspace STATIC "${CMAKE_CURRENT_LIST_DIR}/mikktspace/mikktspace.c")
-target_include_directories(mikktspace SYSTEM PUBLIC "${CMAKE_CURRENT_LIST_DIR}/mikktspace")
-set_target_properties(mikktspace PROPERTIES UNITY_BUILD 0)
+score_use_system(use_sys mikktspace)
+if(use_sys)
+  find_path(MIKKTSPACE_INCLUDE_DIR mikktspace.h)
+  find_library(MIKKTSPACE_LIBRARY NAMES mikktspace)
+  if(MIKKTSPACE_INCLUDE_DIR AND MIKKTSPACE_LIBRARY)
+    add_library(mikktspace INTERFACE IMPORTED GLOBAL)
+    target_include_directories(mikktspace SYSTEM INTERFACE "${MIKKTSPACE_INCLUDE_DIR}")
+    target_link_libraries(mikktspace INTERFACE "${MIKKTSPACE_LIBRARY}")
+  endif()
+endif()
+
+if(NOT TARGET mikktspace)
+  add_library(mikktspace STATIC "${CMAKE_CURRENT_LIST_DIR}/mikktspace/mikktspace.c")
+  target_include_directories(mikktspace SYSTEM PUBLIC "${CMAKE_CURRENT_LIST_DIR}/mikktspace")
+  set_target_properties(mikktspace PROPERTIES UNITY_BUILD 0)
+endif()

3rdparty/miniply.cmake

@@ -1,3 +1,16 @@
-add_library(miniply STATIC "${CMAKE_CURRENT_LIST_DIR}/miniply/miniply.cpp")
-target_include_directories(miniply SYSTEM PUBLIC "${CMAKE_CURRENT_LIST_DIR}/miniply")
-set_target_properties(miniply PROPERTIES UNITY_BUILD 0)
+score_use_system(use_sys miniply)
+if(use_sys)
+  find_path(MINIPLY_INCLUDE_DIR miniply.h)
+  find_library(MINIPLY_LIBRARY NAMES miniply)
+  if(MINIPLY_INCLUDE_DIR AND MINIPLY_LIBRARY)
+    add_library(miniply INTERFACE IMPORTED GLOBAL)
+    target_include_directories(miniply SYSTEM INTERFACE "${MINIPLY_INCLUDE_DIR}")
+    target_link_libraries(miniply INTERFACE "${MINIPLY_LIBRARY}")
+  endif()
+endif()
+
+if(NOT TARGET miniply)
+  add_library(miniply STATIC "${CMAKE_CURRENT_LIST_DIR}/miniply/miniply.cpp")
+  target_include_directories(miniply SYSTEM PUBLIC "${CMAKE_CURRENT_LIST_DIR}/miniply")
+  set_target_properties(miniply PROPERTIES UNITY_BUILD 0)
+endif()

3rdparty/opengametools.cmake

@@ -1,2 +1,13 @@
-add_library(opengametools INTERFACE IMPORTED GLOBAL)
-target_include_directories(opengametools SYSTEM INTERFACE "${CMAKE_CURRENT_LIST_DIR}/opengametools/src")
+score_use_system(use_sys opengametools)
+set(OPENGAMETOOLS_INC "${CMAKE_CURRENT_LIST_DIR}/opengametools/src")
+if(use_sys)
+  find_path(OPENGAMETOOLS_INCLUDE_DIR ogt_vox.h)
+  if(OPENGAMETOOLS_INCLUDE_DIR)
+    set(OPENGAMETOOLS_INC "${OPENGAMETOOLS_INCLUDE_DIR}")
+  endif()
+endif()
+
+if(NOT TARGET opengametools)
+  add_library(opengametools INTERFACE IMPORTED GLOBAL)
+  target_include_directories(opengametools SYSTEM INTERFACE "${OPENGAMETOOLS_INC}")
+endif()

3rdparty/vcglib.cmake

@@ -1,2 +1,13 @@
-add_library(vcglib INTERFACE IMPORTED GLOBAL)
-target_include_directories(vcglib SYSTEM INTERFACE "${CMAKE_CURRENT_LIST_DIR}/vcglib")
+score_use_system(use_sys vcglib)
+set(VCGLIB_INC "${CMAKE_CURRENT_LIST_DIR}/vcglib")
+if(use_sys)
+  find_path(VCGLIB_INCLUDE_DIR vcg/complex/complex.h)
+  if(VCGLIB_INCLUDE_DIR)
+    set(VCGLIB_INC "${VCGLIB_INCLUDE_DIR}")
+  endif()
+endif()
+
+if(NOT TARGET vcglib)
+  add_library(vcglib INTERFACE IMPORTED GLOBAL)
+  target_include_directories(vcglib SYSTEM INTERFACE "${VCGLIB_INC}")
+endif()