import common

Import('*')

from sys import executable as python_cmd

env = env.Clone()

env.Prepend(CPPPATH = [
    '#include',
    '#src/mapi',
    '#src/mesa',
    '#src/glsl',
    '#src/glsl/glcpp',
])

# Make glcpp-parse.h and glsl_parser.h reachable from the include path.
env.Append(CPPPATH = [Dir('.').abspath, Dir('glcpp').abspath])

env.Append(YACCFLAGS = '-d -p "glcpp_parser_"')

parser_env = env.Clone()
parser_env.Append(YACCFLAGS = [
    '--defines=%s' % File('glsl_parser.h').abspath,
    '-p', '_mesa_glsl_',
])

# without this line scons will expect "glsl_parser.hpp" instead of
# "glsl_parser.h", causing glsl_parser.cpp to be regenerated every time
parser_env['YACCHXXFILESUFFIX'] = '.h'

glcpp_lexer = env.CFile('glcpp/glcpp-lex.c', 'glcpp/glcpp-lex.l')
glcpp_parser = env.CFile('glcpp/glcpp-parse.c', 'glcpp/glcpp-parse.y')
glsl_lexer = parser_env.CXXFile('glsl_lexer.cpp', 'glsl_lexer.ll')
glsl_parser = parser_env.CXXFile('glsl_parser.cpp', 'glsl_parser.yy')

# common generated sources
glsl_sources = [
    glcpp_lexer,
    glcpp_parser[0],
    glsl_lexer,
    glsl_parser[0],
] 

# parse Makefile.sources
source_lists = env.ParseSourceList('Makefile.sources')

# add non-generated sources
for l in ('LIBGLCPP_FILES', 'LIBGLSL_FILES'):
    glsl_sources += source_lists[l]

if env['msvc']:
    env.Prepend(CPPPATH = ['#/src/getopt'])
    env.PrependUnique(LIBS = [getopt])

if env['crosscompile'] and not env['embedded']:
    Import('builtin_glsl_function')
else:
    # Copy these files to avoid generation object files into src/mesa/program
    env.Prepend(CPPPATH = ['#src/mesa/program'])
    env.Command('hash_table.c', '#src/mesa/program/hash_table.c', Copy('$TARGET', '$SOURCE'))
    env.Command('symbol_table.c', '#src/mesa/program/symbol_table.c', Copy('$TARGET', '$SOURCE'))

    compiler_objs = env.StaticObject(source_lists['GLSL_COMPILER_CXX_FILES'])

    mesa_objs = env.StaticObject([
        'hash_table.c',
        'symbol_table.c',
    ])

    compiler_objs += mesa_objs

    builtin_compiler = env.Program(
        target = 'builtin_compiler/builtin_compiler',
        source = compiler_objs + glsl_sources + [
            'builtin_compiler/builtin_stubs.cpp',
        ]
    )

    # SCons builtin dependency scanner doesn't detect that glsl_lexer.ll
    # depends on glsl_parser.h
    env.Depends(builtin_compiler, glsl_parser)

    builtin_glsl_function = env.CodeGenerate(
        target = 'builtin_function.cpp',
        script = 'builtins/tools/generate_builtins.py',
        source = builtin_compiler,
        command = python_cmd + ' $SCRIPT $SOURCE > $TARGET'
    )

    env.Depends(builtin_glsl_function, ['builtins/tools/generate_builtins.py', '#src/glsl/builtins/tools/texture_builtins.py'] + Glob('builtins/ir/*'))

    Export('builtin_glsl_function')

    if env['hostonly']:
        Return()


glsl_sources += builtin_glsl_function

glsl = env.ConvenienceLibrary(
    target = 'glsl',
    source = glsl_sources,
)

# SCons builtin dependency scanner doesn't detect that glsl_lexer.ll depends on
# glsl_parser.h
env.Depends(glsl, glsl_parser)

Export('glsl')

# Skip building these programs as they will cause SCons error "Two environments
# with different actions were specified for the same target"
if env['crosscompile'] or env['embedded']:
    Return()

env = env.Clone()

if env['platform'] == 'windows':
    env.PrependUnique(LIBS = [
        'user32',
    ])

env.Prepend(LIBS = [glsl])

glsl2 = env.Program(
    target = 'glsl2',
    source = compiler_objs,
)
env.Alias('glsl2', glsl2)

glcpp = env.Program(
    target = 'glcpp/glcpp',
    source = ['glcpp/glcpp.c'] + mesa_objs,
)
env.Alias('glcpp', glcpp)