CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

project(cghw2)

# Force C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
# Force C99
set(CMAKE_C_STANDARD 99)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_C_EXTENSIONS OFF)

function(find_path_of_file ARG_VAR RELATIVE_PATH DESC ARG_FILE)
	math(EXPR argn ${ARGC}-1)
	set(FIND_EXPR)
	foreach(index RANGE 3 ${argn})
		list(GET ARGV ${index} current)
		set(FIND_EXPR ${FIND_EXPR} ${current})
	endforeach()
	if(NOT ${ARG_VAR})
		file(GLOB_RECURSE ${ARG_VAR}_TMP ${FIND_EXPR})
		if(${ARG_VAR}_TMP)
			list(LENGTH ${ARG_VAR}_TMP l_count)
			if(${l_count} GREATER 1)
				set(${ARG_VAR} "" CACHE PATH "")
				message(FATAL_ERROR "There are multiple copies of a library, please specify the path for ${DESC}.")		
			else()
				get_filename_component(${ARG_VAR}_PATH ${${ARG_VAR}_TMP} DIRECTORY)
				get_filename_component(${ARG_VAR} ${${ARG_VAR}_PATH}/${RELATIVE_PATH} ABSOLUTE)
				set(${ARG_VAR} ${${ARG_VAR}} PARENT_SCOPE)
				message(STATUS "${DESC} is found in ${${ARG_VAR}}")
			endif()
		else()
			set(${ARG_VAR} "" CACHE PATH "")
			message(FATAL_ERROR "${DESC} not found, please specify the path or put it inside the ext/ folder.")
		endif()
	else()
		message(STATUS "${DESC} is found in ${${ARG_VAR}}")
	endif()
endfunction()

find_path_of_file(GLEW_PATH "./" "GLEW_PATH" "${CMAKE_SOURCE_DIR}/ext/glew.pc.in")
find_path_of_file(GLFW_PATH "../../" "GLFW_PATH" "${CMAKE_SOURCE_DIR}/ext/glfw3.h")
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "")
set(GLFW_BUILD_TESTS OFF CACHE BOOL "")
add_subdirectory(${GLFW_PATH})
find_path_of_file(GLM_PATH "../" "GLM_PATH" "${CMAKE_SOURCE_DIR}/ext/glm.hpp")
set(TINYOBJLOADER_PATH "ext/tinyobjloader")
set(LODEPNG_PATH "ext/lodepng")

project(glew)

set(GLEW_SOURCE ${GLEW_PATH}/src/glew.c)
add_library(glew ${GLEW_SOURCE})
target_include_directories(glew PRIVATE ${GLEW_PATH}/include)
target_compile_definitions(glew PRIVATE GLEW_STATIC)

project(tinyobjloader)
set(TOL ${TINYOBJLOADER_PATH}/tiny_obj_loader.cc)
add_library(tinyobjloader ${TOL})

project(lodepng)
set(LPNG ${LODEPNG_PATH}/lodepng.cpp)
add_library(lodepng ${LPNG})
target_include_directories(lodepng PRIVATE ${LODEPNG_PATH})

# cghw2
project(cghw2)
file(GLOB SOURCE_FILES "*.cpp" "*.h")
add_executable(cghw2 ${SOURCE_FILES})
target_include_directories(cghw2 PRIVATE ${GLFW_PATH}/include)
target_include_directories(cghw2 PRIVATE ${GLM_PATH})
target_include_directories(cghw2 PRIVATE ${GLEW_PATH}/include)
target_include_directories(cghw2 PRIVATE ${TINYOBJLOADER_PATH})
target_include_directories(cghw2 PRIVATE ${LODEPNG_PATH})
target_compile_definitions(cghw2 PRIVATE GLEW_STATIC)

target_link_libraries(cghw2 glew)

target_link_libraries(cghw2 glfw)
if(WIN32)
	target_link_libraries(cghw2 opengl32)
endif()
if(UNIX AND NOT APPLE)
	target_link_libraries(cghw2 GL)
endif()
if(APPLE)
	target_link_libraries(cghw2 "-framework OpenGL")
	target_link_libraries(cghw2 "-framework Cocoa")
	target_link_libraries(cghw2 "-framework IOKit")
	target_link_libraries(cghw2 "-framework CoreVideo")
endif()

target_link_libraries(cghw2 tinyobjloader)
target_link_libraries(cghw2 lodepng)