--

-- This software is provided 'as-is', without any express or implied

-- warranty. In no event will the authors be held liable for any damages

-- arising from the use of this software.

--

-- Permission is granted to anyone to use this software for any purpose,

-- including commercial applications, and to alter it and redistribute it

-- freely.

--

-- Meta-build system using premake created and maintained by

-- Benjamin Henning <b.henning@digipen.edu>

--[[

sdl_dependency_checkers.lua

This script contains a bunch of functions which determine whether certain

dependencies exist on the current platform. These functions are able to use

any and all available utilities for trying to determine both whether the

dependency is available on this platform, and how to build to the dependency.

There are a few limitations with these functions, but many of the limitations

can be mitigated by using the dependency definition functions in the project

definition files.

Each function in this file, in order to be a valid dependency function, must

return a table with the following entries:

'found' = boolean value indicating whether the dependency was found

'incDirs' = table of include directory strings, or nil if none are needed

'libDirs' = table of library directory strings, or nil if none are needed

'libs' = table of libraries to link to, or nil if none are needed

All functions must be properly registered with the project definition system

in order to be properly referenced by projects.

]]

-- dependency functions must return the following:

-- table with an element found, incDirs, libDirs, and libs

function openGLDep()

print("Checking OpenGL dependencies...")

if SDL_getos() == "macosx" then

-- mac should always have support for OpenGL...

return { found = true, libs = { "OpenGL.framework" } }

elseif SDL_getos() == "ios" then

--...unless on iOS

print("Desktop OpenGL is not supported on iOS targets.")

return { found = false, libs = { "OpenGL.framework" } }

elseif SDL_getos() == "cygwin" then

print("OpenGL is not currently supported on Cygwin.")

return { found = false, libDirs = { }, libs = { "OpenGL32" } }

end

local libpath = nil

local libname = nil

if SDL_getos() == "windows" or SDL_getos() == "mingw" then

libpath = os.findlib("OpenGL32")

libname = "OpenGL32"

else -- *nix

libpath = os.findlib("libGL")

libname = "GL"

end

local foundLib = libpath ~= nil

-- another way to possibly find the dependency on windows

--if not foundLib then

-- foundLib, libpath = find_dependency_dir_windows(nil, "C:/Program Files (x86);C:/Program Files", "Microsoft SDKs", "Lib")

--end

if not foundLib then return { found = false } end

if SDL_getos() == "mingw" then

libpath = libpath:gsub("\\", "/"):gsub("//", "/")

end

return { found = foundLib, libDirs = { }, libs = { libname } }

end

function directXDep()

print("Checking DirectX dependencies...")

-- enable this for more correct searching, but it's much slower

local searchPath = nil --os.getenvpath("ProgramFiles", "ProgramFiles(x86)")

local foundInc, incpath = find_dependency_dir_windows("DXSDK_DIR", searchPath, "DirectX", "Include")

local foundLib, libpath = find_dependency_dir_windows("DXSDK_DIR", searchPath, "DirectX", "Lib/x86")

if not foundInc or not foundLib then return { found = false } end

-- XXX: hacked mingw check...

if foundInc and SDL_getos() == "mingw" then

incpath = incpath:gsub("%$%(DXSDK_DIR%)", os.getenv("DXSDK_DIR")):gsub("\\", "/"):gsub("//", "/")

libpath = libpath:gsub("%$%(DXSDK_DIR%)", os.getenv("DXSDK_DIR")):gsub("\\", "/"):gsub("//", "/")

end

if SDL_getos() == "mingw" then

print("DirectX is not currently supported on MinGW targets.")

return { found = false, incDirs = { incpath }, libDirs = { libpath } }

end

if SDL_getos() == "cygwin" then

print("DirectX is not currently supported on Cygwin targets.")

return { found = false, incDirs = { incpath }, libDirs = { libpath } }

end

return { found = true, incDirs = { incpath }, libDirs = { libpath } }

end

function dbusDep()

print("Checking for D-Bus support...")

if not check_include_directories("/usr/include/dbus-1.0", "/usr/lib/x86_64-linux-gnu/dbus-1.0/include") then

print("Warning: D-Bus unsupported!")

return { found = false }

end

return { found = true, incDirs = { "/usr/include/dbus-1.0", "/usr/lib/x86_64-linux-gnu/dbus-1.0/include" } }

end

function alsaDep()

print("Checking for ALSA support...")

if not check_include_files("alsa/asoundlib.h")

or os.findlib("asound") == nil

or not check_library_exists_lookup("asound", "snd_pcm_open", "alsa/asoundlib.h")

or not SDL_assertdepfunc("DLOpen") then

print("Warning: ALSA unsupported!")

return { found = false }

end

return { found = true }

end

function pulseAudioDep()

print("Checking for PulseAudio support...")

if os.findlib("libpulse-simple") == nil

or not SDL_assertdepfunc("DLOpen") then

print("Warning: PulseAudio unsupported!")

return { found = false }

end

return { found = true }

end

function esdDep()

print("Checking for ESD support...")

if os.findlib("esd") == nil

or not SDL_assertdepfunc("DLOpen") then

print("Warning: ESD unsupported!")

return { found = false }

end

return { found = true }

end

function nasDep()

print("Checking for NAS support...")

if not check_include_file("audio/audiolib.h")

or not SDL_assertdepfunc("DLOpen") then

print("Warning: NAS unsupported!")

return { found = false }

end

return { found = true }

end

function ossDep()

print("Checking for OSS support...")

if not check_cxx_source_compiles([[

#include <sys/soundcard.h>

int main() { int arg = SNDCTL_DSP_SETFRAGMENT; return 0; }]])

and not check_cxx_source_compiles([[

#include <soundcard.h>

int main() { int arg = SNDCTL_DSP_SETFRAGMENT; return 0; }]]) then

print("Warning: OSS unsupported!")

return { found = false }

end

return { found = true }

end

function dlOpenDep()

print("Checking for DLOpen support...")

if not check_library_exists_multiple("dlopen", "dlfcn.h", "dl", "tdl") then

print("Warning: DLOpen unsupported!")

return { found = false }

end

return { found = true, libs = { "dl" } }

end

function x11Dep()

print("Checking for X11 support...")

for _, v in ipairs { "X11", "Xext", "Xcursor", "Xinerama", "Xi", "Xrandr", "Xrender", "Xss", "Xxf86vm" } do

if os.findlib(v) == nil then

print("Warning: X11 unsupported!")

return { found = false }

end

end

if not check_include_files("X11/Xcursor/Xcursor.h", "X11/extensions/Xinerama.h",

"X11/extensions/XInput2.h", "X11/extensions/Xrandr.h", "X11/extensions/Xrender.h",

"X11/extensions/scrnsaver.h", "X11/extensions/shape.h", "X11/Xlib.h",

"X11/extensions/xf86vmode.h") then

print("Warning: X11 unsupported!")

return { found = false }

end

if not SDL_assertdepfunc("DLOpen") then

print("Warning: X11 unsupported!")

return { found = false }

end

-- XXX: shared memory check...

-- there's a LOT more to check to properly configure X11...

return { found = true, libs = { "X11" } }

end

-- register all of these dependency functions with the definition system

SDL_registerDependencyChecker("OpenGL", openGLDep)

SDL_registerDependencyChecker("DirectX", directXDep)

SDL_registerDependencyChecker("DBus", dbusDep)

SDL_registerDependencyChecker("ALSA", alsaDep)

SDL_registerDependencyChecker("PulseAudio", pulseAudioDep)

SDL_registerDependencyChecker("ESD", esdDep)

SDL_registerDependencyChecker("NAS", nasDep)

SDL_registerDependencyChecker("OSS", ossDep)

SDL_registerDependencyChecker("DLOpen", dlOpenDep)

SDL_registerDependencyChecker("X11", x11Dep)