Help("""

Targets:

    all              - build everything,

    libs             - build all libraries

    demos            - build all demos

    models           - download/prepare all models

    docs             - compile doxygen documentation

    libs = (static-lib, python-module)

    static-lib       - ray tracer library to link with

    python-module    - ray tracer module for Python

    demos = (python-demos, cc-demos)

    python-demos     - Python demos, this depends on python-module

    cc-demos         - C++ demos

    models = (local-models, download-models)

    local-models     - prepare local models

    download-models  - download models which are not locally available

    no-docs = (libs, demos, models)

                     - everything but docs

    no-download = (libs, demos, local-models)

                     - everything but docs and downloadable models

    vcproj           - generate project files for Visual C++ Studio

Default target is no-download.

Options:

""")

import os, sys

EnsurePythonVersion(2, 3)

EnsureSConsVersion(0, 97)

Decider('MD5-timestamp')

SConsignFile('build/.sconsign.dblite')

vars = Variables(files=['build/.varscache'])

vars.AddVariables(

	BoolVariable('simd', 'allow SSE intrinsics', True),

	('precision', 'floating point number precision (single/double)', "single"),

	('flags', 'add additional compiler flags', ""),

	BoolVariable('force_flags', "use only flags specified by 'flags' option (do not autodetect arch/sse flags)", False),

	('ldflags', 'add additional linker flags', ""),

	BoolVariable('profile', "enable gcc's profiling support (-pg)", False),

)

vars.Update(env)

vars.Save('build/.varscache', env)

Help(vars.GenerateHelpText(env))

if env.GetOption('help') == True or env.GetOption('clean') == True:

    Return()

### configure

platform = 'unknown'

def CheckPlatform(context):

	global platform

	context.Message('Platform is... ')

	if sys.platform[:5] == 'linux':

		platform = 'linux'

	elif env['PLATFORM'] == 'posix':

		platform = 'posix'

	context.Result(platform)

	return True

intelcversion = ''

def CheckIntelC(context):

	global intelc, intelcversion

	context.Message('Checking for IntelC compiler... ')

	intelc = Tool("intelc").exists(env) == True

	if intelc:

		testenv = Environment()

		Tool("intelc").generate(testenv)

		intelcversion = str(testenv['INTEL_C_COMPILER_VERSION']/10.)

		context.Result(intelcversion)

	else:

		context.Result(intelc)

	return intelc

def CheckGCC(context):

	global gcc, gccversion

	context.Message('Checking for GCC compiler... ')

	testenv = Environment()

	gcc = "g++" in testenv['TOOLS']

	if gcc:

		gccversion = testenv['CCVERSION']

		context.Result(gccversion)

	else:

		gccversion = ''

		context.Result(False)

	return gcc

def CheckCPUFlags(context):

	global cpu, cpuflags_gcc, cpuflags_intelc

	context.Message('Checking CPU arch and flags... ')

	env.Execute('@$CC tools/cpuflags.c -o tools/cpuflags')

	(cpu, cpuflags_gcc, cpuflags_intelc) = os.popen('tools'+os.sep+'cpuflags %s %s'

		% (''.join(gccversion.rsplit('.',1)), intelcversion) ).read().split('\n')[:3]

	context.Result(cpu)

	return True

conf_dir = "#build/.sconf_temp"

log_file="#build/config.log"

config_h="#build/include/config.h"

conf = Configure(env, conf_dir=conf_dir, log_file=log_file, config_h=config_h,

    clean=False, help=False,

	custom_tests = {

conf.CheckPlatform()

conf.CheckGCC()

if intelc and (not gcc or conf.env['intelc']):

	Tool('intelc').generate(conf.env)

	cc = 'intelc'

elif gcc:

	cc = 'gcc'

else:

	cc = 'none'

if cc == 'intelc' or cc == 'gcc':

	conf.CheckCPUFlags()

add_flags = ''

if cc == 'gcc':

	add_flags += cpuflags_gcc + ' -ffast-math '

if cc == 'intelc':

	add_flags += cpuflags_intelc + ' '

if conf.env['force_flags']:

	add_flags = conf.env['flags'] + ' '

else:

	add_flags += conf.env['flags'] + ' '

if conf.env['precision'] == 'double':

	conf.Define("PYRIT_DOUBLE")

if not conf.env['simd'] or conf.env['precision'] == 'double':

	conf.Define("NO_SIMD")

if cc == 'intelc':

	conf.env.Append(CCFLAGS="-O3 -w1 " + add_flags)

elif cc == 'gcc':

	conf.env.Append(CCFLAGS="-O3 -Wall -pipe " + add_flags)

	# Other useful flags:

	# -Wunsafe-loop-optimizations -Wpointer-arith -Wcast-align -Wconversion

	# -Wmissing-noreturn -Winline -Wdisabled-optimization

else:

	print "No supported compiler found."

	Exit(1)

print "Using compiler: " + cc

print "Additional flags: " + add_flags

if conf.env['profile'] and cc == 'gcc':

	conf.env.Append(CCFLAGS="-pg", LINKFLAGS="-pg")

if conf.env['ldflags']:

	conf.env.Append(LINKFLAGS=conf.env['ldflags'])

# configure pthread

# configure libpng

conf.CheckLibWithHeader('zlib', 'zlib.h', 'C')

if conf.CheckLibWithHeader('libpng', 'png.h', 'C'):

	conf.Define('HAVE_PNG')

env = conf.Finish()

# configure Python

pyenv = env.Clone()

have_python = True

if not have_python:

	print "Error: Python is required."

	Exit(1)

# configure SDL

sdlenv = env.Clone()

def CheckSDL(context):

	global have_sdl

	context.Message('Checking for SDL... ')

	if context.TryLink("#include <SDL.h>\n"+

		"int main(int argc,char **argv){return 0;}", '.cc'):

		context.Result(1)

		return True

	else:

		context.Result("no (some demos won't be built)")

	return False

conf = Configure(sdlenv, conf_dir=conf_dir, log_file=log_file, config_h=config_h,

    clean=False, help=False,

	custom_tests = {'CheckSDL' : CheckSDL} )

have_sdl = conf.CheckSDL()

sdlenv = conf.Finish()

### build targets

Export('env pyenv sdlenv have_sdl cc')

lib = SConscript('src/SConscript', variant_dir='build/lib', duplicate=0,

	exports={'buildmodule':False})

SConscript('tests/SConscript', variant_dir='build/tests', duplicate=0, exports='lib')

SConscript('models/SConscript')

env.Alias('demos', ['cc-demos', 'python-demos'])

env.Alias('libs', ['static-lib', 'python-module'])

env.Alias('docs', Command('docs/html', [], 'doxygen'))

env.Clean('docs', ['docs/html'])

env.Alias('no-docs', ['libs', 'demos', 'models'])

env.Alias('no-download', ['libs', 'demos', 'local-models'])

env.Alias('all', ['no-docs', 'docs'])

env.Alias('pyrit', 'no-download')

Default('pyrit')