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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 '#ifdef need_MESA_remap_table'

		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 ''

		print '#endif /* need_MESA_remap_table */'

		print ''

		# output remap helpers for DRI drivers

		for ext in extensions:

			funcs = []

			remapped = []

			for f in extension_functions[ext]:

				if f.assign_offset:

					# these are handled above

					remapped.append(f)

				else:

					# these functions are either in the

					# abi, or have offset -1

					funcs.append(f)

			print '#if defined(need_%s)' % (ext)

			if remapped:

				print '/* functions defined in MESA_remap_table_functions are excluded */'

			# output extension functions that need to be mapped

			print 'static const struct gl_function_remap %s_functions[] = {' % (ext)

			for f in funcs:

				if f.offset >= 0:

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

							% (pool_indices[f], f.name)

				else:

					print '   { %5d, -1 }, /* %s */' % \

							(pool_indices[f], f.name)

			print '   {    -1, -1 }'

			print '};'

			print '#endif'

			print ''

		return

def show_usage():

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

	sys.exit(1)

if __name__ == '__main__':

	file_name = "gl_API.xml"

	try:

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

	except Exception,e:

		show_usage()

	for (arg,val) in args:

		if arg == "-f":

			file_name = val

	api = gl_XML.parse_GL_API( file_name )

	printer = PrintGlRemap()

	printer.Print( api )