From 7a564f0504ad0fbd16828a03f27d757c6d7e83c7 Mon Sep 17 00:00:00 2001
From: Brent Spillner <spillner@acm.org>
Date: Wed, 10 May 2023 03:46:58 +1000
Subject: [PATCH] Added option to link against system assimp/glbinding
 libraries instead of building as dependencies.

---
 doomsday/cmake/assimp-system.cmake    | 87 +++++++++++++++++++++++++++
 doomsday/cmake/glbinding-system.cmake | 33 ++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 doomsday/cmake/assimp-system.cmake
 create mode 100644 doomsday/cmake/glbinding-system.cmake

diff --git a/doomsday/cmake/assimp-system.cmake b/doomsday/cmake/assimp-system.cmake
new file mode 100644
index 0000000000..fae57835f4
--- /dev/null
+++ b/doomsday/cmake/assimp-system.cmake
@@ -0,0 +1,87 @@
+if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+	set(ASSIMP_ARCHITECTURE "64")
+elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
+	set(ASSIMP_ARCHITECTURE "32")
+endif(CMAKE_SIZEOF_VOID_P EQUAL 8)
+	
+if(WIN32)
+	set(ASSIMP_ROOT_DIR CACHE PATH "ASSIMP root directory")
+
+	# Find path of each library
+	find_path(ASSIMP_INCLUDE_DIR
+		NAMES
+			assimp/anim.h
+		HINTS
+			${ASSIMP_ROOT_DIR}/include
+	)
+
+	if(MSVC12)
+		set(ASSIMP_MSVC_VERSION "vc120")
+	elseif(MSVC14)	
+		set(ASSIMP_MSVC_VERSION "vc140")
+	endif(MSVC12)
+	
+	if(MSVC12 OR MSVC14)
+	
+		find_path(ASSIMP_LIBRARY_DIR
+			NAMES
+				assimp-${ASSIMP_MSVC_VERSION}-mt.lib
+			HINTS
+				${ASSIMP_ROOT_DIR}/lib${ASSIMP_ARCHITECTURE}
+		)
+		
+		find_library(ASSIMP_LIBRARY_RELEASE				assimp-${ASSIMP_MSVC_VERSION}-mt.lib 			PATHS ${ASSIMP_LIBRARY_DIR})
+		find_library(ASSIMP_LIBRARY_DEBUG				assimp-${ASSIMP_MSVC_VERSION}-mtd.lib			PATHS ${ASSIMP_LIBRARY_DIR})
+		
+		set(ASSIMP_LIBRARY 
+			optimized 	${ASSIMP_LIBRARY_RELEASE}
+			debug		${ASSIMP_LIBRARY_DEBUG}
+		)
+		
+		set(ASSIMP_LIBRARIES "ASSIMP_LIBRARY_RELEASE" "ASSIMP_LIBRARY_DEBUG")
+	
+		FUNCTION(ASSIMP_COPY_BINARIES TargetDirectory)
+			ADD_CUSTOM_TARGET(AssimpCopyBinaries
+				COMMAND ${CMAKE_COMMAND} -E copy ${ASSIMP_ROOT_DIR}/bin${ASSIMP_ARCHITECTURE}/assimp-${ASSIMP_MSVC_VERSION}-mtd.dll 	${TargetDirectory}/Debug/assimp-${ASSIMP_MSVC_VERSION}-mtd.dll
+				COMMAND ${CMAKE_COMMAND} -E copy ${ASSIMP_ROOT_DIR}/bin${ASSIMP_ARCHITECTURE}/assimp-${ASSIMP_MSVC_VERSION}-mt.dll 		${TargetDirectory}/Release/assimp-${ASSIMP_MSVC_VERSION}-mt.dll
+			COMMENT "Copying Assimp binaries to '${TargetDirectory}'"
+			VERBATIM)
+		ENDFUNCTION(ASSIMP_COPY_BINARIES)
+	
+	endif()
+	
+elseif (DE_USE_SYSTEM_ASSIMP)
+
+	find_path(
+	  ASSIMP_INCLUDE_DIR
+	  NAMES assimp/postprocess.h assimp/scene.h assimp/version.h assimp/config.h assimp/cimport.h
+	  PATHS /usr/local/include
+	  PATHS /usr/include/
+
+	)
+
+	find_library(
+	  ASSIMP_LIBRARIES
+	  NAMES assimp
+	  PATHS /usr/local/lib/
+	  PATHS /usr/lib64/
+	  PATHS /usr/lib/
+	)
+
+endif(WIN32 OR DE_USE_SYSTEM_ASSIMP)
+
+
+if (ASSIMP_INCLUDE_DIR AND ASSIMP_LIBRARIES)
+  SET(assimp_FOUND TRUE)
+ENDIF (ASSIMP_INCLUDE_DIR AND ASSIMP_LIBRARIES)
+
+if (assimp_FOUND)
+  if (NOT assimp_FIND_QUIETLY)
+	message(STATUS "Found asset importer library: ${ASSIMP_LIBRARIES}")
+  endif (NOT assimp_FIND_QUIETLY)
+else (assimp_FOUND)
+  if (DE_USE_SYSTEM_ASSIMP OR assimp_FIND_REQUIRED)
+	message(FATAL_ERROR "Could not find asset importer library")
+  endif (assimp_FIND_REQUIRED)
+endif (assimp_FOUND)
+
diff --git a/doomsday/cmake/glbinding-system.cmake b/doomsday/cmake/glbinding-system.cmake
new file mode 100644
index 0000000000..1db7fa2c0d
--- /dev/null
+++ b/doomsday/cmake/glbinding-system.cmake
@@ -0,0 +1,33 @@
+# Find the glbinding headers and library in standard system paths
+
+find_path(
+  glbinding_INCLUDE_DIR
+  NAMES glbinding/glbinding-version.h
+  PATHS /usr/local/include
+  PATHS /usr/include/
+)
+
+find_library(
+  glbinding_LIBRARIES
+  NAMES glbinding
+  PATHS /usr/local/lib64/
+  PATHS /usr/local/lib/
+  PATHS /usr/lib64/
+  PATHS /usr/lib/
+)
+
+if (glbinding_INCLUDE_DIR AND glbinding_LIBRARIES)
+  SET(glbinding_FOUND TRUE)
+  SET(glbinding::glbinding_FOUND TRUE)
+
+  FILE(READ ${glbinding_INCLUDE_DIR}/glbinding/glbinding-version.h GLBINDING_VERSION_H)
+  STRING(REGEX MATCH "define[ ]+GLBINDING_VERSION_MAJOR[ ]+\"[0-9]+" GLBINDING_MAJOR_VERSION_LINE "${GLBINDING_VERSION_H}")
+ STRING(REGEX REPLACE "define[ ]+GLBINDING_VERSION_MAJOR[ ]+\"([0-9]+)" "\\1" glbinding_VERSION_MAJOR "${GLBINDING_MAJOR_VERSION_LINE}")
+
+  STRING(REGEX MATCH "define[ ]+GLBINDING_VERSION_MINOR[ ]+\"[0-9]+" GLBINDING_MINOR_VERSION_LINE "${GLBINDING_VERSION_H}")
+ STRING(REGEX REPLACE "define[ ]+GLBINDING_VERSION_MINOR[ ]+\"([0-9]+)" "\\1" glbinding_VERSION_MINOR "${GLBINDING_MINOR_VERSION_LINE}")
+
+  message (STATUS "Using system glbinding library, version ${glbinding_VERSION_MAJOR}.${glbinding_VERSION_MINOR}")
+
+ENDIF (glbinding_INCLUDE_DIRS AND glbinding_LIBRARIES)
+