cmake_minimum_required (VERSION 2.8)

project (mesademos)

include (FindPkgConfig)
include (CheckCCompilerFlag)
include (CheckSymbolExists)

find_package (OpenGL REQUIRED)
find_package (GLUT REQUIRED)
find_package (X11)

set (GLAD_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/src/glad/include)

if (PKG_CONFIG_FOUND AND NOT WIN32)
	pkg_check_modules (EGL egl)
	pkg_check_modules (GLESV1 glesv1_cm)
	pkg_check_modules (GLESV2 glesv2)
	pkg_check_modules (VG vg)
	pkg_check_modules (OSMESA osmesa)
endif ()

# Check for FreeGLUT 2.6 or later
set (CMAKE_REQUIRED_INCLUDES "${GLUT_INCLUDE_DIR}")
set (CMAKE_REQUIRED_LIBRARIES "${GLUT_glut_LIBRARY}")
check_symbol_exists ("glutInitContextProfile" "GL/glut.h;GL/freeglut.h" HAVE_FREEGLUT)
if (HAVE_FREEGLUT)
	add_definitions (-DHAVE_FREEGLUT)
endif ()

if (UNIX)
	link_libraries(m)
endif (UNIX)

# On Mac OS X, GLX is provided as a separate OpenGL implementation, different
# from the standard OpenGL framework which provides support for GLUT and native
# Mac OS X applications.
if (X11_FOUND)
	if (APPLE)
		find_path (X11_GL_INCLUDE_PATH GL/glx.h ${X11_INC_SEARCH_PATH})
		if (NOT X11_GL_INCLUDE_PATH)
			message (WARNING "Could not find GL/glx.h")
			set (X11_FOUND FALSE)
		endif (NOT X11_GL_INCLUDE_PATH)
		set (X11_INCLUDE_DIR ${X11_INCLUDE_DIR} ${X11_GL_INCLUDE_PATH})

		find_library (X11_GL_LIB GL ${X11_LIB_SEARCH_PATH})
		if (NOT X11_GL_LIB)
			message (WARNING "Could not find libGL.dylib")
			set (X11_FOUND FALSE)
		endif (NOT X11_GL_LIB)

		find_library (X11_GLU_LIB GLU ${X11_LIB_SEARCH_PATH})
		if (NOT X11_GLU_LIB)
			message (WARNING "Could not find libGLU.dylib")
			set (X11_FOUND FALSE)
		endif (NOT X11_GLU_LIB)
	else ()
		set (X11_INCLUDE_DIR ${X11_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR})
		set (X11_GL_LIB ${OPENGL_gl_LIBRARY})
		set (X11_GLU_LIB ${OPENGL_glu_LIBRARY})
	endif ()
endif (X11_FOUND)

if (CMAKE_COMPILER_IS_GNUCC)
	add_definitions(
		-Wall
		-Wpointer-arith
		-Wmissing-declarations
		-fno-strict-aliasing
		#-Wold-style-definition
		#-Wdeclaration-after-statement
        )
	set (CMAKE_C_FLAGS "-Wmissing-prototypes -Wnested-externs -Wbad-function-cast ${CMAKE_CXX_FLAGS}")
endif ()

if (WIN32)
	# Nobody likes to include windows.h:
	# - Microsoft's GL/gl.h header depends on windows.h but doesn't include it;
	# - certain GLUT distributions don't include it;
	# - most of our programs are meant to be portable so don't include it.
	#
	# We could try to replicate the windows.h definitions required by
	# GL/gl.h, but the build time savings don't compensate the constant
	# headaches that brings, so instead we force windows.h to be included
	# on every file.
	if (MSVC)
		add_definitions (-FIwindows.h)
	else (MSVC)
		add_definitions (--include windows.h)
	endif (MSVC)

	# Don't define min/max macros
	add_definitions (-DNOMINMAX)

	# MSVC & MinGW only define & use APIENTRY
	add_definitions (-DGLAPIENTRY=__stdcall)

	link_libraries (winmm)
endif (WIN32)

if (MSVC)
	message (WARNING "MSVC builds are unmainted.  MinGW-w64 is recommended.")

	# Enable math constants defines
	add_definitions (-D_USE_MATH_DEFINES)

	# Silence several MSVC pedantic warnings
	add_definitions (-D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS)
	add_definitions (-D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS)
	add_definitions (-wd4018) # signed/unsigned mismatch
	add_definitions (-wd4244) # conversion' conversion from 'type1' to 'type2', possible loss of data
	add_definitions (-wd4305) # truncation from 'type1' to 'type2'

	# Use static runtime
	# http://www.cmake.org/Wiki/CMake_FAQ#How_can_I_build_my_MSVC_application_with_a_static_runtime.3F
	foreach (flag_var
		CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
		CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO
	)
		if (${flag_var} MATCHES "/MD")
			string (REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
		endif ()
	endforeach (flag_var)
endif (MSVC)

if (MINGW)
	# Avoid depending on MinGW runtime DLLs
	check_c_compiler_flag (-static-libgcc HAVE_STATIC_LIBGCC_FLAG)
	if (HAVE_STATIC_LIBGCC_FLAG)
		set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libgcc")
		set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -static-libgcc")
		set (CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -static-libgcc")
	endif ()
	check_c_compiler_flag (-static-libstdc++ HAVE_STATIC_LIBSTDCXX_FLAG)
	if (HAVE_STATIC_LIBSTDCXX_FLAG)
		set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libstdc++")
		set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -static-libstdc++")
		set (CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -static-libstdc++")
	endif ()
endif ()

if (APPLE)
	# Silence deprecated function warnings (we rely on GLUT which is now
	# declared as deprecated)
	add_definitions (-Wno-deprecated-declarations)
endif ()

add_definitions(-DDEMOS_DATA_DIR=\"../data/\")

if (BUILD_SHARED_LIBS AND NOT DEFINED LIBDIR)
	set(LIBDIR lib)
endif (BUILD_SHARED_LIBS AND NOT DEFINED LIBDIR)

add_subdirectory (src)


install (FILES index.html DESTINATION doc)

set (CPACK_PACKAGE_NAME "mesa-demos")
set (CPACK_PACKAGE_VERSION_MAJOR "8")
set (CPACK_PACKAGE_VERSION_MINOR "4")
set (CPACK_PACKAGE_VERSION_PATCH "0")

if (WIN32)
    set (CPACK_GENERATOR "ZIP")
elseif (APPLE)
    set (CPACK_GENERATOR "DragNDrop")
    set (CPACK_DMG_FORMAT "UDBZ")
else ()
    set (CPACK_GENERATOR "TBZ2")
endif ()

include(CPack)