cmake_minimum_required(VERSION 3.10)

# So library linking is more sane.
cmake_policy(SET CMP0003 NEW)

# So syntax problems are errors.
cmake_policy(SET CMP0010 NEW)

# Input directories must have CMakeLists.txt
cmake_policy(SET CMP0014 NEW)

# Compile definitions.
cmake_policy(SET CMP0043 NEW)

# Use ROOT variables in find_package.
cmake_policy(SET CMP0074 NEW)

# Convert relative paths to absolute in target_sources()
cmake_policy(SET CMP0076 NEW)

# Copy files from source directory to destination directory, substituting any
# variables.  Create destination directory if it does not exist.

macro(configure_files srcDir destDir)
    message(STATUS "Configuring directory ${destDir}")
    make_directory(${destDir})

    file(GLOB templateFiles RELATIVE ${srcDir} ${srcDir}/*)
    foreach(templateFile ${templateFiles})
        set(srcTemplatePath ${srcDir}/${templateFile})
        if(NOT IS_DIRECTORY ${srcTemplatePath})
            message(STATUS "Configuring file ${templateFile}")
            configure_file(
                    ${srcTemplatePath}
                    ${destDir}/${templateFile}
                    @ONLY)
        endif(NOT IS_DIRECTORY ${srcTemplatePath})
    endforeach(templateFile)
endmacro(configure_files)

# Initialize project
project(ComputeEngine)

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(default_build_type "Release")

# Add binary
add_library(${PROJECT_NAME} STATIC)

# Find GLFW

set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)

#find_path(GLFW_INCLUDE_DIR GLFW/glfw3.h
#HINTS
#${CMAKE_CURRENT_SOURCE_DIR}/include
#${CMAKE_CURRENT_SOURCE_DIR}/lib
#${GLFW_ROOT}
#${GLFW_ROOT}/include)
#
#if(GLFW_INCLUDE_DIR)
#message(STATUS "GLFW_INCLUDE_DIR: ${GLFW_INCLUDE_DIR}")
#else()
#message(FATAL_ERROR "glfw3.h not found")
#endif()
#
#find_path(GLFW_LIB_DIR glfw3.lib
#HINTS
#${CMAKE_CURRENT_SOURCE_DIR}/include
#${CMAKE_CURRENT_SOURCE_DIR}/lib
#${GLFW_ROOT}/lib
#${GLFW_ROOT}/lib-vc2019
#${GLFW_ROOT}/lib-vc2017
#${GLFW_ROOT}/lib-vc2015)
#
#if(GLFW_LIB_DIR)
#message(STATUS "GLFW_LIB_DIR: ${GLFW_LIB_DIR}")
#else()
#message(FATAL_ERROR "glfw3.lib not found")
#endif()

find_package(glfw3 CONFIG REQUIRED)

# Find GLEW

# unset (GLEW_USE_STATIC_LIBS CACHE)
# unset (GLEW_LIBRARIES CACHE)
# set(GLEW_USE_STATIC_LIBS TRUE)
# set(GLEW_VERBOSE TRUE)
# SET(GLEW_DIR "C:\\Desktop\\git\\vcpkg\\downloads\\tools\\cmake-3.25.1-windows\\cmake-3.25.1-windows-i386\\share\\cmake-3.25\\Modules")

set(VCPKG_TARGET_TRIPLET x64-windows-static)
find_package(GLEW REQUIRED)
set(VCPKG_TARGET_TRIPLET x64-windows)

if(GLEW_FOUND)
set(GLEW_INCLUDE_DIR ${GLEW_INCLUDE_DIRS})
#get_filename_component(GLEW_LIBRARIES ${GLEW_LIBRARIES} DIRECTORY)
message(STATUS "GLEW_INCLUDE_DIR: ${GLEW_INCLUDE_DIR}")
message(STATUS "GLEW_LIBRARIES: ${GLEW_LIBRARIES}")
else()
message(FATAL_ERROR "GLEW not found")
endif()

# Find OpenGL
if(NOT WIN32)
    find_package(OpenGL REQUIRED)
endif()

# Find stb_image

find_package(Stb REQUIRED)

#find_path(stb_image_INCLUDE_DIR stb_image.h
#        HINTS
#        ${CMAKE_CURRENT_SOURCE_DIR}/include
#        ${CMAKE_CURRENT_SOURCE_DIR}/include/stb
#        ${CMAKE_CURRENT_SOURCE_DIR}/lib
#        ${CMAKE_CURRENT_SOURCE_DIR}
#        "/usr/include/stb"
#        ${stb_image_ROOT})

if(Stb_INCLUDE_DIR)
message(STATUS "Stb_INCLUDE_DIR: ${Stb_INCLUDE_DIR}")
else()
message(FATAL_ERROR "stb_image not found")
endif()

# Add source
add_subdirectory(src)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src
${GLFW_INCLUDE_DIR}
${OPENGL_INCLUDE_DIR}
${Stb_INCLUDE_DIR}
${GLEW_INCLUDE_DIR})
target_link_directories(${PROJECT_NAME} PUBLIC ${GLFW_LIB_DIR} ${GLEW_LIBRARIES})

if(WIN32)
	target_link_libraries(${PROJECT_NAME} glfw GLEW::glew_s)
else()
	target_link_libraries(${PROJECT_NAME} glfw OpenGL::GL GLEW::glew_s)
endif()


# Header files
file(COPY src/ComputeEngine.h DESTINATION ${CMAKE_BINARY_DIR}/include)
file(COPY src/Timer.h DESTINATION ${CMAKE_BINARY_DIR}/include)
file(COPY src/Texture.h DESTINATION ${CMAKE_BINARY_DIR}/include)
file(COPY src/UBO.h DESTINATION ${CMAKE_BINARY_DIR}/include)
file(COPY src/SSBO.h DESTINATION ${CMAKE_BINARY_DIR}/include)
file(COPY src/Shader.h DESTINATION ${CMAKE_BINARY_DIR}/include)
file(COPY src/Program.h DESTINATION ${CMAKE_BINARY_DIR}/include)
file(COPY src/GLUtils.h DESTINATION ${CMAKE_BINARY_DIR}/include)