aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mapi/glapi/gen/gl_XML.py
blob: 0196879127c12476e96174b30f9c59bed4884dfb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
#!/usr/bin/env python

# (C) Copyright IBM Corporation 2004, 2005
# All Rights Reserved.
#
# 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.
#
# Authors:
#    Ian Romanick <idr@us.ibm.com>

from decimal import Decimal
import libxml2
import re, sys, string
import typeexpr


def parse_GL_API( file_name, factory = None ):
    doc = libxml2.readFile( file_name, None, libxml2.XML_PARSE_XINCLUDE + libxml2.XML_PARSE_NOBLANKS + libxml2.XML_PARSE_DTDVALID + libxml2.XML_PARSE_DTDATTR + libxml2.XML_PARSE_DTDLOAD + libxml2.XML_PARSE_NOENT )
    ret = doc.xincludeProcess()

    if not factory:
        factory = gl_item_factory()

    api = factory.create_item( "api", None, None )
    api.process_element( doc )

    # After the XML has been processed, we need to go back and assign
    # dispatch offsets to the functions that request that their offsets
    # be assigned by the scripts.  Typically this means all functions
    # that are not part of the ABI.

    for func in api.functionIterateByCategory():
        if func.assign_offset:
            func.offset = api.next_offset;
            api.next_offset += 1

    doc.freeDoc()

    return api


def is_attr_true( element, name ):
    """Read a name value from an element's attributes.

    The value read from the attribute list must be either 'true' or
    'false'.  If the value is 'false', zero will be returned.  If the
    value is 'true', non-zero will be returned.  An exception will be
    raised for any other value."""

    value = element.nsProp( name, None )
    if value == "true":
        return 1
    elif value == "false":
        return 0
    else:
        raise RuntimeError('Invalid value "%s" for boolean "%s".' % (value, name))


class gl_print_base(object):
    """Base class of all API pretty-printers.

    In the model-view-controller pattern, this is the view.  Any derived
    class will want to over-ride the printBody, printRealHader, and
    printRealFooter methods.  Some derived classes may want to over-ride
    printHeader and printFooter, or even Print (though this is unlikely).
    """

    def __init__(self):
        # Name of the script that is generating the output file.
        # Every derived class should set this to the name of its
        # source file.

        self.name = "a"


        # License on the *generated* source file.  This may differ
        # from the license on the script that is generating the file.
        # Every derived class should set this to some reasonable
        # value.
        #
        # See license.py for an example of a reasonable value.

        self.license = "The license for this file is unspecified."


        # The header_tag is the name of the C preprocessor define
        # used to prevent multiple inclusion.  Typically only
        # generated C header files need this to be set.  Setting it
        # causes code to be generated automatically in printHeader
        # and printFooter.

        self.header_tag = None


        # List of file-private defines that must be undefined at the
        # end of the file.  This can be used in header files to define
        # names for use in the file, then undefine them at the end of
        # the header file.

        self.undef_list = []
        return


    def Print(self, api):
        self.printHeader()
        self.printBody(api)
        self.printFooter()
        return


    def printHeader(self):
        """Print the header associated with all files and call the printRealHeader method."""

        print '/* DO NOT EDIT - This file generated automatically by %s script */' \
                % (self.name)
        print ''
        print '/*'
        print ' * ' + self.license.replace('\n', '\n * ')
        print ' */'
        print ''
        if self.header_tag:
            print '#if !defined( %s )' % (self.header_tag)
            print '#  define %s' % (self.header_tag)
            print ''
        self.printRealHeader();
        return


    def printFooter(self):
        """Print the header associated with all files and call the printRealFooter method."""

        self.printRealFooter()

        if self.undef_list:
            print ''
            for u in self.undef_list:
                print "#  undef %s" % (u)

        if self.header_tag:
            print ''
            print '#endif /* !defined( %s ) */' % (self.header_tag)


    def printRealHeader(self):
        """Print the "real" header for the created file.

        In the base class, this function is empty.  All derived
        classes should over-ride this function."""
        return


    def printRealFooter(self):
        """Print the "real" footer for the created file.

        In the base class, this function is empty.  All derived
        classes should over-ride this function."""
        return


    def printPure(self):
        """Conditionally define `PURE' function attribute.

        Conditionally defines a preprocessor macro `PURE' that wraps
        GCC's `pure' function attribute.  The conditional code can be
        easilly adapted to other compilers that support a similar
        feature.

        The name is also added to the file's undef_list.
        """
        self.undef_list.append("PURE")
        print """#  if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
#    define PURE __attribute__((pure))
#  else
#    define PURE
#  endif"""
        return


    def printFastcall(self):
        """Conditionally define `FASTCALL' function attribute.

        Conditionally defines a preprocessor macro `FASTCALL' that
        wraps GCC's `fastcall' function attribute.  The conditional
        code can be easilly adapted to other compilers that support a
        similar feature.

        The name is also added to the file's undef_list.
        """

        self.undef_list.append("FASTCALL")
        print """#  if defined(__i386__) && defined(__GNUC__) && !defined(__CYGWIN__) && !defined(__MINGW32__)
#    define FASTCALL __attribute__((fastcall))
#  else
#    define FASTCALL
#  endif"""
        return


    def printVisibility(self, S, s):
        """Conditionally define visibility function attribute.

        Conditionally defines a preprocessor macro name S that wraps
        GCC's visibility function attribute.  The visibility used is
        the parameter s.  The conditional code can be easilly adapted
        to other compilers that support a similar feature.

        The name is also added to the file's undef_list.
        """

        self.undef_list.append(S)
        print """#  if (defined(__GNUC__) && !defined(__CYGWIN__) && !defined(__MINGW32__)) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590) && defined(__ELF__))
#    define %s  __attribute__((visibility("%s")))
#  else
#    define %s
#  endif""" % (S, s, S)
        return


    def printNoinline(self):
        """Conditionally define `NOINLINE' function attribute.

        Conditionally defines a preprocessor macro `NOINLINE' that
        wraps GCC's `noinline' function attribute.  The conditional
        code can be easilly adapted to other compilers that support a
        similar feature.

        The name is also added to the file's undef_list.
        """

        self.undef_list.append("NOINLINE")
        print """#  if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
#    define NOINLINE __attribute__((noinline))
#  else
#    define NOINLINE
#  endif"""
        return


def real_function_name(element):
    name = element.nsProp( "name", None )
    alias = element.nsProp( "alias", None )

    if alias:
        return alias
    else:
        return name


def real_category_name(c):
    if re.compile("[1-9][0-9]*[.][0-9]+").match(c):
        return "GL_VERSION_" + c.replace(".", "_")
    else:
        return c


def classify_category(name, number):
    """Based on the category name and number, select a numerical class for it.

    Categories are divided into four classes numbered 0 through 3.  The
    classes are:

            0. Core GL versions, sorted by version number.
            1. ARB extensions, sorted by extension number.
            2. Non-ARB extensions, sorted by extension number.
            3. Un-numbered extensions, sorted by extension name.
    """

    try:
        core_version = float(name)
    except Exception,e:
        core_version = 0.0

    if core_version > 0.0:
        cat_type = 0
        key = name
    elif name.startswith("GL_ARB_") or name.startswith("GLX_ARB_") or name.startswith("WGL_ARB_"):
        cat_type = 1
        key = int(number)
    else:
        if number != None:
            cat_type = 2
            key = int(number)
        else:
            cat_type = 3
            key = name


    return [cat_type, key]


def create_parameter_string(parameters, include_names):
    """Create a parameter string from a list of gl_parameters."""

    list = []
    for p in parameters:
        if p.is_padding:
            continue

        if include_names:
            list.append( p.string() )
        else:
            list.append( p.type_string() )

    if len(list) == 0: list = ["void"]

    return string.join(list, ", ")


class gl_item(object):
    def __init__(self, element, context):
        self.context = context
        self.name = element.nsProp( "name", None )
        self.category = real_category_name( element.parent.nsProp( "name", None ) )
        return


class gl_type( gl_item ):
    def __init__(self, element, context):
        gl_item.__init__(self, element, context)
        self.size = int( element.nsProp( "size", None ), 0 )

        te = typeexpr.type_expression( None )
        tn = typeexpr.type_node()
        tn.size = int( element.nsProp( "size", None ), 0 )
        tn.integer = not is_attr_true( element, "float" )
        tn.unsigned = is_attr_true( element, "unsigned" )
        tn.pointer = is_attr_true( element, "pointer" )
        tn.name = "GL" + self.name
        te.set_base_type_node( tn )

        self.type_expr = te
        return


    def get_type_expression(self):
        return self.type_expr


class gl_enum( gl_item ):
    def __init__(self, element, context):
        gl_item.__init__(self, element, context)
        self.value = int( element.nsProp( "value", None ), 0 )

        temp = element.nsProp( "count", None )
        if not temp or temp == "?":
            self.default_count = -1
        else:
            try:
                c = int(temp)
            except Exception,e:
                raise RuntimeError('Invalid count value "%s" for enum "%s" in function "%s" when an integer was expected.' % (temp, self.name, n))

            self.default_count = c

        return


    def priority(self):
        """Calculate a 'priority' for this enum name.

        When an enum is looked up by number, there may be many
        possible names, but only one is the 'prefered' name.  The
        priority is used to select which name is the 'best'.

        Highest precedence is given to core GL name.  ARB extension
        names have the next highest, followed by EXT extension names.
        Vendor extension names are the lowest.
        """

        if self.name.endswith( "_BIT" ):
            bias = 1
        else:
            bias = 0

        if self.category.startswith( "GL_VERSION_" ):
            priority = 0
        elif self.category.startswith( "GL_ARB_" ):
            priority = 2
        elif self.category.startswith( "GL_EXT_" ):
            priority = 4
        else:
            priority = 6

        return priority + bias



class gl_parameter(object):
    def __init__(self, element, context):
        self.name = element.nsProp( "name", None )

        ts = element.nsProp( "type", None )
        self.type_expr = typeexpr.type_expression( ts, context )

        temp = element.nsProp( "variable_param", None )
        if temp:
            self.count_parameter_list = temp.split( ' ' )
        else:
            self.count_parameter_list = []

        # The count tag can be either a numeric string or the name of
        # a variable.  If it is the name of a variable, the int(c)
        # statement will throw an exception, and the except block will
        # take over.

        c = element.nsProp( "count", None )
        try: 
            count = int(c)
            self.count = count
            self.counter = None
        except Exception,e:
            count = 1
            self.count = 0
            self.counter = c

        self.count_scale = int(element.nsProp( "count_scale", None ))

        elements = (count * self.count_scale)
        if elements == 1:
            elements = 0

        #if ts == "GLdouble":
        #	print '/* stack size -> %s = %u (before)*/' % (self.name, self.type_expr.get_stack_size())
        #	print '/* # elements = %u */' % (elements)
        self.type_expr.set_elements( elements )
        #if ts == "GLdouble":
        #	print '/* stack size -> %s = %u (after) */' % (self.name, self.type_expr.get_stack_size())

        self.is_client_only = is_attr_true( element, 'client_only' )
        self.is_counter     = is_attr_true( element, 'counter' )
        self.is_output      = is_attr_true( element, 'output' )


        # Pixel data has special parameters.

        self.width      = element.nsProp('img_width',  None)
        self.height     = element.nsProp('img_height', None)
        self.depth      = element.nsProp('img_depth',  None)
        self.extent     = element.nsProp('img_extent', None)

        self.img_xoff   = element.nsProp('img_xoff',   None)
        self.img_yoff   = element.nsProp('img_yoff',   None)
        self.img_zoff   = element.nsProp('img_zoff',   None)
        self.img_woff   = element.nsProp('img_woff',   None)

        self.img_format = element.nsProp('img_format', None)
        self.img_type   = element.nsProp('img_type',   None)
        self.img_target = element.nsProp('img_target', None)

        self.img_pad_dimensions = is_attr_true( element, 'img_pad_dimensions' )
        self.img_null_flag      = is_attr_true( element, 'img_null_flag' )
        self.img_send_null      = is_attr_true( element, 'img_send_null' )

        self.is_padding = is_attr_true( element, 'padding' )
        return


    def compatible(self, other):
        return 1


    def is_array(self):
        return self.is_pointer()


    def is_pointer(self):
        return self.type_expr.is_pointer()


    def is_image(self):
        if self.width:
            return 1
        else:
            return 0


    def is_variable_length(self):
        return len(self.count_parameter_list) or self.counter


    def is_64_bit(self):
        count = self.type_expr.get_element_count()
        if count:
            if (self.size() / count) == 8:
                return 1
        else:
            if self.size() == 8:
                return 1

        return 0


    def string(self):
        return self.type_expr.original_string + " " + self.name


    def type_string(self):
        return self.type_expr.original_string


    def get_base_type_string(self):
        return self.type_expr.get_base_name()


    def get_dimensions(self):
        if not self.width:
            return [ 0, "0", "0", "0", "0" ]

        dim = 1
        w = self.width
        h = "1"
        d = "1"
        e = "1"

        if self.height:
            dim = 2
            h = self.height

        if self.depth:
            dim = 3
            d = self.depth

        if self.extent:
            dim = 4
            e = self.extent

        return [ dim, w, h, d, e ]


    def get_stack_size(self):
        return self.type_expr.get_stack_size()


    def size(self):
        if self.is_image():
            return 0
        else:
            return self.type_expr.get_element_size()


    def get_element_count(self):
        c = self.type_expr.get_element_count()
        if c == 0:
            return 1

        return c


    def size_string(self, use_parens = 1):
        s = self.size()
        if self.counter or self.count_parameter_list:
            list = [ "compsize" ]

            if self.counter and self.count_parameter_list:
                list.append( self.counter )
            elif self.counter:
                list = [ self.counter ]

            if s > 1:
                list.append( str(s) )

            if len(list) > 1 and use_parens :
                return "(%s)" % (string.join(list, " * "))
            else:
                return string.join(list, " * ")

        elif self.is_image():
            return "compsize"
        else:
            return str(s)


    def format_string(self):
        if self.type_expr.original_string == "GLenum":
            return "0x%x"
        else:
            return self.type_expr.format_string()



class gl_function( gl_item ):
    def __init__(self, element, context):
        self.context = context
        self.name = None

        self.entry_points = []
        self.return_type = "void"
        self.parameters = []
        self.offset = -1
        self.initialized = 0
        self.images = []

        # self.entry_point_api_map[name][api] is a decimal value
        # indicating the earliest version of the given API in which
        # each entry point exists.  Every entry point is included in
        # the first level of the map; the second level of the map only
        # lists APIs which contain the entry point in at least one
        # version.  For example,
        # self.entry_point_gles_map['ClipPlanex'] == { 'es1':
        # Decimal('1.1') }.
        self.entry_point_api_map = {}

        self.assign_offset = 0

        self.static_entry_points = []

        # Track the parameter string (for the function prototype)
        # for each entry-point.  This is done because some functions
        # change their prototype slightly when promoted from extension
        # to ARB extension to core.  glTexImage3DEXT and glTexImage3D
        # are good examples of this.  Scripts that need to generate
        # code for these differing aliases need to real prototype
        # for each entry-point.  Otherwise, they may generate code
        # that won't compile.

        self.entry_point_parameters = {}

        self.process_element( element )

        return


    def process_element(self, element):
        name = element.nsProp( "name", None )
        alias = element.nsProp( "alias", None )

        if is_attr_true(element, "static_dispatch"):
            self.static_entry_points.append(name)

        self.entry_points.append( name )

        self.entry_point_api_map[name] = {}
        for api in ('es1', 'es2'):
            version_str = element.nsProp(api, None)
            assert version_str is not None
            if version_str != 'none':
                self.entry_point_api_map[name][api] = Decimal(version_str)

        if alias:
            true_name = alias
        else:
            true_name = name

            # Only try to set the offset when a non-alias
            # entry-point is being processes.

            offset = element.nsProp( "offset", None )
            if offset:
                try:
                    o = int( offset )
                    self.offset = o
                except Exception, e:
                    self.offset = -1
                    if offset == "assign":
                        self.assign_offset = 1


        if not self.name:
            self.name = true_name
        elif self.name != true_name:
            raise RuntimeError("Function true name redefined.  Was %s, now %s." % (self.name, true_name))


        # There are two possible cases.  The first time an entry-point
        # with data is seen, self.initialized will be 0.  On that
        # pass, we just fill in the data.  The next time an
        # entry-point with data is seen, self.initialized will be 1.
        # On that pass we have to make that the new values match the
        # valuse from the previous entry-point.

        parameters = []
        return_type = "void"
        child = element.children
        while child:
            if child.type == "element":
                if child.name == "return":
                    return_type = child.nsProp( "type", None )
                elif child.name == "param":
                    param = self.context.factory.create_item( "parameter", child, self.context)
                    parameters.append( param )

            child = child.next


        if self.initialized:
            if self.return_type != return_type:
                raise RuntimeError( "Return type changed in %s.  Was %s, now %s." % (name, self.return_type, return_type))

            if len(parameters) != len(self.parameters):
                raise RuntimeError( "Parameter count mismatch in %s.  Was %d, now %d." % (name, len(self.parameters), len(parameters)))

            for j in range(0, len(parameters)):
                p1 = parameters[j]
                p2 = self.parameters[j]
                if not p1.compatible( p2 ):
                    raise RuntimeError( 'Parameter type mismatch in %s.  "%s" was "%s", now "%s".' % (name, p2.name, p2.type_expr.original_string, p1.type_expr.original_string))


        if true_name == name or not self.initialized:
            self.return_type = return_type
            self.parameters = parameters

            for param in self.parameters:
                if param.is_image():
                    self.images.append( param )

        if element.children:
            self.initialized = 1
            self.entry_point_parameters[name] = parameters
        else:
            self.entry_point_parameters[name] = []

        return

    def filter_entry_points(self, entry_point_list):
        """Filter out entry points not in entry_point_list."""
        if not self.initialized:
            raise RuntimeError('%s is not initialized yet' % self.name)

        entry_points = []
        for ent in self.entry_points:
            if ent not in entry_point_list:
                if ent in self.static_entry_points:
                    self.static_entry_points.remove(ent)
                self.entry_point_parameters.pop(ent)
            else:
                entry_points.append(ent)

        if not entry_points:
            raise RuntimeError('%s has no entry point after filtering' % self.name)

        self.entry_points = entry_points
        if self.name not in entry_points:
            # use the first remaining entry point
            self.name = entry_points[0]
            self.parameters = self.entry_point_parameters[entry_points[0]]

    def get_images(self):
        """Return potentially empty list of input images."""
        return self.images


    def parameterIterator(self, name = None):
        if name is not None:
            return self.entry_point_parameters[name].__iter__();
        else:
            return self.parameters.__iter__();


    def get_parameter_string(self, entrypoint = None):
        if entrypoint:
            params = self.entry_point_parameters[ entrypoint ]
        else:
            params = self.parameters

        return create_parameter_string( params, 1 )

    def get_called_parameter_string(self):
        p_string = ""
        comma = ""

        for p in self.parameterIterator():
            p_string = p_string + comma + p.name
            comma = ", "

        return p_string


    def is_abi(self):
        return (self.offset >= 0 and not self.assign_offset)

    def is_static_entry_point(self, name):
        return name in self.static_entry_points

    def dispatch_name(self):
        if self.name in self.static_entry_points:
            return self.name
        else:
            return "_dispatch_stub_%u" % (self.offset)

    def static_name(self, name):
        if name in self.static_entry_points:
            return name
        else:
            return "_dispatch_stub_%u" % (self.offset)

    def entry_points_for_api_version(self, api, version = None):
        """Return a list of the entry point names for this function
        which are supported in the given API (and optionally, version).

        Use the decimal.Decimal type to precisely express non-integer
        versions.
        """
        result = []
        for entry_point, api_to_ver in self.entry_point_api_map.iteritems():
            if api not in api_to_ver:
                continue
            if version is not None and version < api_to_ver[api]:
                continue
            result.append(entry_point)
        return result


class gl_item_factory(object):
    """Factory to create objects derived from gl_item."""

    def create_item(self, item_name, element, context):
        if item_name == "function":
            return gl_function(element, context)
        if item_name == "type":
            return gl_type(element, context)
        elif item_name == "enum":
            return gl_enum(element, context)
        elif item_name == "parameter":
            return gl_parameter(element, context)
        elif item_name == "api":
            return gl_api(self)
        else:
            return None


class gl_api(object):
    def __init__(self, factory):
        self.functions_by_name = {}
        self.enums_by_name = {}
        self.types_by_name = {}

        self.category_dict = {}
        self.categories = [{}, {}, {}, {}]

        self.factory = factory

        self.next_offset = 0

        typeexpr.create_initial_types()
        return

    def filter_functions(self, entry_point_list):
        """Filter out entry points not in entry_point_list."""
        functions_by_name = {}
        for func in self.functions_by_name.itervalues():
            entry_points = [ent for ent in func.entry_points if ent in entry_point_list]
            if entry_points:
                func.filter_entry_points(entry_points)
                functions_by_name[func.name] = func

        self.functions_by_name = functions_by_name

    def filter_functions_by_api(self, api, version = None):
        """Filter out entry points not in the given API (or
        optionally, not in the given version of the given API).
        """
        functions_by_name = {}
        for func in self.functions_by_name.itervalues():
            entry_points = func.entry_points_for_api_version(api, version)
            if entry_points:
                func.filter_entry_points(entry_points)
                functions_by_name[func.name] = func

        self.functions_by_name = functions_by_name

    def process_element(self, doc):
        element = doc.children
        while element.type != "element" or element.name != "OpenGLAPI":
            element = element.next

        if element:
            self.process_OpenGLAPI(element)
        return


    def process_OpenGLAPI(self, element):
        child = element.children
        while child:
            if child.type == "element":
                if child.name == "category":
                    self.process_category( child )
                elif child.name == "OpenGLAPI":
                    self.process_OpenGLAPI( child )

            child = child.next

        return


    def process_category(self, cat):
        cat_name = cat.nsProp( "name", None )
        cat_number = cat.nsProp( "number", None )

        [cat_type, key] = classify_category(cat_name, cat_number)
        self.categories[cat_type][key] = [cat_name, cat_number]

        child = cat.children
        while child:
            if child.type == "element":
                if child.name == "function":
                    func_name = real_function_name( child )

                    temp_name = child.nsProp( "name", None )
                    self.category_dict[ temp_name ] = [cat_name, cat_number]

                    if self.functions_by_name.has_key( func_name ):
                        func = self.functions_by_name[ func_name ]
                        func.process_element( child )
                    else:
                        func = self.factory.create_item( "function", child, self )
                        self.functions_by_name[ func_name ] = func

                    if func.offset >= self.next_offset:
                        self.next_offset = func.offset + 1


                elif child.name == "enum":
                    enum = self.factory.create_item( "enum", child, self )
                    self.enums_by_name[ enum.name ] = enum
                elif child.name == "type":
                    t = self.factory.create_item( "type", child, self )
                    self.types_by_name[ "GL" + t.name ] = t


            child = child.next

        return


    def functionIterateByCategory(self, cat = None):
        """Iterate over functions by category.

        If cat is None, all known functions are iterated in category
        order.  See classify_category for details of the ordering.
        Within a category, functions are sorted by name.  If cat is
        not None, then only functions in that category are iterated.
        """
        lists = [{}, {}, {}, {}]

        for func in self.functionIterateAll():
            [cat_name, cat_number] = self.category_dict[func.name]

            if (cat == None) or (cat == cat_name):
                [func_cat_type, key] = classify_category(cat_name, cat_number)

                if not lists[func_cat_type].has_key(key):
                    lists[func_cat_type][key] = {}

                lists[func_cat_type][key][func.name] = func


        functions = []
        for func_cat_type in range(0,4):
            keys = lists[func_cat_type].keys()
            keys.sort()

            for key in keys:
                names = lists[func_cat_type][key].keys()
                names.sort()

                for name in names:
                    functions.append(lists[func_cat_type][key][name])

        return functions.__iter__()


    def functionIterateByOffset(self):
        max_offset = -1
        for func in self.functions_by_name.itervalues():
            if func.offset > max_offset:
                max_offset = func.offset


        temp = [None for i in range(0, max_offset + 1)]
        for func in self.functions_by_name.itervalues():
            if func.offset != -1:
                temp[ func.offset ] = func


        list = []
        for i in range(0, max_offset + 1):
            if temp[i]:
                list.append(temp[i])

        return list.__iter__();


    def functionIterateAll(self):
        return self.functions_by_name.itervalues()


    def enumIterateByName(self):
        keys = self.enums_by_name.keys()
        keys.sort()

        list = []
        for enum in keys:
            list.append( self.enums_by_name[ enum ] )

        return list.__iter__()


    def categoryIterate(self):
        """Iterate over categories.

        Iterate over all known categories in the order specified by
        classify_category.  Each iterated value is a tuple of the
        name and number (which may be None) of the category.
        """

        list = []
        for cat_type in range(0,4):
            keys = self.categories[cat_type].keys()
            keys.sort()

            for key in keys:
                list.append(self.categories[cat_type][key])

        return list.__iter__()


    def get_category_for_name( self, name ):
        if self.category_dict.has_key(name):
            return self.category_dict[name]
        else:
            return ["<unknown category>", None]


    def typeIterate(self):
        return self.types_by_name.itervalues()


    def find_type( self, type_name ):
        if type_name in self.types_by_name:
            return self.types_by_name[ type_name ].type_expr
        else:
            print "Unable to find base type matching \"%s\"." % (type_name)
            return None