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#!/usr/bin/env python

# Copyright (C) 2009 Chia-I Wu 

# All Rights Reserved.

#

# This is based on extension_helper.py by Ian Romanick.

#

# Permission is hereby granted, free of charge, to any person obtaining a

# copy of this software and associated documentation files (the "Software"),

# to deal in the Software without restriction, including without limitation

# on the rights to use, copy, modify, merge, publish, distribute, sub

# license, and/or sell copies of the Software, and to permit persons to whom

# the Software is furnished to do so, subject to the following conditions:

#

# The above copyright notice and this permission notice (including the next

# paragraph) shall be included in all copies or substantial portions of the

# Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL

# IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

# IN THE SOFTWARE.

import gl_XML

import license

import sys, getopt, string

def get_function_spec(func):

    sig = ""

    # derive parameter signature

    for p in func.parameterIterator():

        if p.is_padding:

            continue

        # FIXME: This is a *really* ugly hack. :(

        tn = p.type_expr.get_base_type_node()

        if p.is_pointer():

            sig += 'p'

        elif tn.integer:

            sig += 'i'

        elif tn.size == 4:

            sig += 'f'

        else:

            sig += 'd'

    spec = [sig]

    for ent in func.entry_points:

        spec.append("gl" + ent)

    # spec is terminated by an empty string

    spec.append('')

    return spec

class PrintGlRemap(gl_XML.gl_print_base):

    def __init__(self):

        gl_XML.gl_print_base.__init__(self)

        self.name = "remap_helper.py (from Mesa)"

        self.license = license.bsd_license_template % ("Copyright (C) 2009 Chia-I Wu ", "Chia-I Wu")

        return

    def printRealHeader(self):

        print '#include "main/dispatch.h"'

        print '#include "main/remap.h"'

        print ''

        return

    def printBody(self, api):

        pool_indices = {}

        print '/* this is internal to remap.c */'

        print '#ifndef need_MESA_remap_table'

        print '#error Only remap.c should include this file!'

        print '#endif /* need_MESA_remap_table */'

        print ''

        print ''

        print 'static const char _mesa_function_pool[] ='

        # output string pool

        index = 0;

        for f in api.functionIterateAll():

            pool_indices[f] = index

            spec = get_function_spec(f)

            # a function has either assigned offset, fixed offset,

            # or no offset

            if f.assign_offset:

                comments = "will be remapped"

            elif f.offset > 0:

                comments = "offset %d" % f.offset

            else:

                comments = "dynamic"

            print '   /* _mesa_function_pool[%d]: %s (%s) */' \

                            % (index, f.name, comments)

            for line in spec:

                print '   "%s\\0"' % line

                index += len(line) + 1

        print '   ;'

        print ''

        print '/* these functions need to be remapped */'

        print 'static const struct gl_function_pool_remap MESA_remap_table_functions[] = {'

        # output all functions that need to be remapped

        # iterate by offsets so that they are sorted by remap indices

        for f in api.functionIterateByOffset():

            if not f.assign_offset:

                continue

            print '   { %5d, %s_remap_index },' \

                            % (pool_indices[f], f.name)

        print '   {    -1, -1 }'

        print '};'

        print ''

        # collect functions by versions/extensions

        extension_functions = {}

        abi_extensions = []

        for f in api.functionIterateAll():

            for n in f.entry_points:

                category, num = api.get_category_for_name(n)

                # consider only GL_VERSION_X_Y or extensions

                c = gl_XML.real_category_name(category)

                if c.startswith("GL_"):

                    if not extension_functions.has_key(c):

                        extension_functions[c] = []

                    extension_functions[c].append(f)

                    # remember the ext names of the ABI

                    if (f.is_abi() and n == f.name and

                            c not in abi_extensions):

                        abi_extensions.append(c)

        # ignore the ABI itself

        for ext in abi_extensions:

            extension_functions.pop(ext)

        extensions = extension_functions.keys()

        extensions.sort()

        # output ABI functions that have alternative names (with ext suffix)

        print '/* these functions are in the ABI, but have alternative names */'

        print 'static const struct gl_function_remap MESA_alt_functions[] = {'

        for ext in extensions:

            funcs = []

            for f in extension_functions[ext]:

                # test if the function is in the ABI and has alt names

                if f.is_abi() and len(f.entry_points) > 1:

                    funcs.append(f)

            if not funcs:

                continue

            print '   /* from %s */' % ext

            for f in funcs:

                print '   { %5d, _gloffset_%s },' \

                                % (pool_indices[f], f.name)

        print '   {    -1, -1 }'

        print '};'

        print ''

        return

def show_usage():

    print "Usage: %s [-f input_file_name] [-c ver]" % sys.argv[0]

    print "    -c ver    Version can be 'es1' or 'es2'."

    sys.exit(1)

if __name__ == '__main__':

    file_name = "gl_API.xml"

    try:

        (args, trail) = getopt.getopt(sys.argv[1:], "f:c:")

    except Exception,e:

        show_usage()

    es = None

    for (arg,val) in args:

        if arg == "-f":

            file_name = val

        elif arg == "-c":

            es = val

    api = gl_XML.parse_GL_API( file_name )

    if es is not None:

        api.filter_functions_by_api(es)

    printer = PrintGlRemap()

    printer.Print( api )