FreeGlut MacOS Support

CMakeLists.txt

@@ -10,6 +10,9 @@ set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
 # Declare Project where "GSM_TEMPLATE" is the project name
 project(GSM_TEMPLATE LANGUAGES C CXX)
 
+# Use FreeGlut on Macos (Requires X11 to be installed, but doesn't use it)
+option(USE_FREEGLUT "Use FreeGLUT on Mac (ignored on Windows)" ON)
+
 # Allow cmake to fetch web repositories
 include(FetchContent)
 
@@ -41,13 +44,28 @@ FetchContent_MakeAvailable(stb_image)
 
 
 # If using the Windows compiler
-if (MSVC)
+if (MSVC OR USE_FREEGLUT)
+
+  if (APPLE)
+
+    find_path(XQUARTZ_INCLUDE_DIR X11/Xlib.h
+      PATHS /opt/X11/include
+      NO_DEFAULT_PATH
+    )
+
+    if(NOT XQUARTZ_INCLUDE_DIR)
+      message(FATAL_ERROR "To use FreeGLUT on Mac, you need XQuartz installed.  Please install it from https://www.xquartz.org/ or set the USE_FREEGLUT cache option to OFF")
+    endif()
+
+  endif()
+
+  set(CMAKE_POLICY_VERSION_MINIMUM 3.16)
 
   # Download freeglut
 	FetchContent_Declare(
 		freeglut
 		GIT_REPOSITORY https://github.com/freeglut/freeglut.git
-		GIT_TAG "master"
+    GIT_TAG "v3.8.0"
 		GIT_SHALLOW TRUE
 		GIT_PROGRESS ON
 	)
@@ -56,6 +74,11 @@ if (MSVC)
 	set(FREEGLUT_BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
 	set(FREEGLUT_BUILD_STATIC_LIBS ON CACHE BOOL "" FORCE)
 
+  # Force Cocca on Mac
+  if(APPLE)
+    set(FREEGLUT_USE_X11 OFF CACHE BOOL "" FORCE)
+    set(FREEGLUT_COCOA ON CACHE BOOL "" FORCE)
+  endif()
 
 	FetchContent_MakeAvailable(freeglut)
 
@@ -76,8 +99,8 @@ endif()
 # Tell Cmake to find the locations of libraries
 find_package(OpenGL REQUIRED)
 
-# Only require glut if on macos
-if (APPLE)
+# Only require glut if on macos and not using freeglut
+if (APPLE AND NOT USE_FREEGLUT)
   find_package(GLUT REQUIRED)
 endif()
 # Define MY_SOURCES to be a list of all the source files for my game 
@@ -117,6 +140,37 @@ target_sources("${CMAKE_PROJECT_NAME}" PRIVATE ${MY_SOURCES})
 # If on mac
 if (APPLE)
 
+# FreeGlut for mac
+if (USE_FREEGLUT)
+
+
+target_sources("${CMAKE_PROJECT_NAME}" PRIVATE "${glad_SOURCE_DIR}/src/glad.c")
+target_include_directories("${CMAKE_PROJECT_NAME}" PUBLIC "${glad_SOURCE_DIR}/include")
+
+# Add our include files
+target_include_directories("${CMAKE_PROJECT_NAME}" PUBLIC 
+"${CMAKE_CURRENT_SOURCE_DIR}/include/"
+"${freeglut_SOURCE_DIR}/include"
+"${glad_SOURCE_DIR}/include"
+)
+
+target_compile_definitions("${CMAKE_PROJECT_NAME}" PUBLIC use_freeglut=TRUE)
+
+target_link_libraries("${CMAKE_PROJECT_NAME}" 
+  PRIVATE 
+  OpenGL::GL
+  freeglut_static
+  "-framework Cocoa"
+  "-framework IOKit"
+  "-framework CoreVideo"
+  "-lpthread"
+  stb_image
+  miniaudio
+)
+
+# Native GLUT for Mac
+else()
+
 # Add our include files
 target_include_directories("${CMAKE_PROJECT_NAME}" PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include/")
 
@@ -138,6 +192,7 @@ target_link_libraries("${CMAKE_PROJECT_NAME}"
   stb_image
   miniaudio
 )
+endif()
 
 
 # If on windows