reactos/dll/opengl/mesa/src/mesa/main/APIspecutil.py

   1 #!/usr/bin/python
   2 #
   3 # Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
   4 #
   5 # Permission is hereby granted, free of charge, to any person obtaining a
   6 # copy of this software and associated documentation files (the "Software"),
   7 # to deal in the Software without restriction, including without limitation
   8 # on the rights to use, copy, modify, merge, publish, distribute, sub
   9 # license, and/or sell copies of the Software, and to permit persons to whom
  10 # the Software is furnished to do so, subject to the following conditions:
  11 #
  12 # The above copyright notice and this permission notice (including the next
  13 # paragraph) shall be included in all copies or substantial portions of the
  14 # Software.
  15 #
  16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 # FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19 # IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22 # IN THE SOFTWARE.
  23 """
  24 Minimal apiutil.py interface for use by es_generator.py.
  25 """
  26
  27 import sys
  28 import libxml2
  29
  30 import APIspec
  31
  32 __spec = {}
  33 __functions = {}
  34 __aliases = {}
  35
  36 def _ParseXML(filename, apiname):
  37     conversions = {
  38         # from           to
  39         'GLfloat':  [ 'GLdouble' ],
  40         'GLclampf': [ 'GLclampd' ],
  41         'GLubyte':  [ 'GLfloat', 'GLdouble' ],
  42         'GLint':    [ 'GLfloat', 'GLdouble' ],
  43         'GLfixed':  [ 'GLfloat', 'GLdouble' ],
  44         'GLclampx': [ 'GLclampf', 'GLclampd' ],
  45     }
  46
  47     doc = libxml2.readFile(filename, None,
  48             libxml2.XML_PARSE_DTDLOAD +
  49             libxml2.XML_PARSE_DTDVALID +
  50             libxml2.XML_PARSE_NOBLANKS)
  51     spec = APIspec.Spec(doc)
  52     impl = spec.get_impl()
  53     api = spec.get_api(apiname)
  54     doc.freeDoc()
  55
  56     __spec["impl"] = impl
  57     __spec["api"] = api
  58
  59     for func in api.functions:
  60         alias, need_conv = impl.match(func, conversions)
  61         if not alias:
  62             # external functions are manually dispatched
  63             if not func.is_external:
  64                 print >>sys.stderr, "Error: unable to dispatch %s" % func.name
  65             alias = func
  66             need_conv = False
  67
  68         __functions[func.name] = func
  69         __aliases[func.name] = (alias, need_conv)
  70
  71
  72 def AllSpecials(notused=None):
  73     """Return a list of all external functions in the API."""
  74     api = __spec["api"]
  75
  76     specials = []
  77     for func in api.functions:
  78         if func.is_external:
  79             specials.append(func.name)
  80
  81     return specials
  82
  83
  84 def GetAllFunctions(filename, api):
  85     """Return sorted list of all functions in the API."""
  86     if not __spec:
  87         _ParseXML(filename, api)
  88
  89     api = __spec["api"]
  90     names = []
  91     for func in api.functions:
  92         names.append(func.name)
  93     names.sort()
  94     return names
  95
  96
  97 def ReturnType(funcname):
  98     """Return the C return type of named function."""
  99     func = __functions[funcname]
 100     return func.return_type
 101
 102
 103 def Properties(funcname):
 104     """Return list of properties of the named GL function."""
 105     func = __functions[funcname]
 106     return [func.direction]
 107
 108
 109 def _ValidValues(func, param):
 110     """Return the valid values of a parameter."""
 111     valid_values = []
 112     switch = func.checker.switches.get(param.name, [])
 113     for desc in switch:
 114         # no dependent vector
 115         if not desc.checker.switches:
 116             for val in desc.values:
 117                 valid_values.append((val, None, None, [], desc.error, None))
 118             continue
 119
 120         items = desc.checker.switches.items()
 121         if len(items) > 1:
 122             print >>sys.stderr, "%s: more than one parameter depend on %s" % \
 123                     (func.name, desc.name)
 124         dep_name, dep_switch = items[0]
 125
 126         for dep_desc in dep_switch:
 127             if dep_desc.index >= 0 and dep_desc.index != 0:
 128                 print >>sys.stderr, "%s: not first element of a vector" % func.name
 129             if dep_desc.checker.switches:
 130                 print >>sys.stderr, "%s: deep nested dependence" % func.name
 131
 132             convert = None if dep_desc.convert else "noconvert"
 133             for val in desc.values:
 134                 valid_values.append((val, dep_desc.size_str, dep_desc.name,
 135                                      dep_desc.values, dep_desc.error, convert))
 136     return valid_values
 137
 138
 139 def _Conversion(func, src_param):
 140     """Return the destination type of the conversion, or None."""
 141     alias, need_conv = __aliases[func.name]
 142     if need_conv:
 143         dst_param = alias.get_param(src_param.name)
 144         if src_param.type == dst_param.type:
 145             need_conv = False
 146     if not need_conv:
 147         return (None, "none")
 148
 149     converts = { True: 0, False: 0 }
 150
 151     # In Fogx, for example,  pname may be GL_FOG_DENSITY/GL_FOG_START/GL_FOG_END
 152     # or GL_FOG_MODE.  In the former three cases, param is not checked and the
 153     # default is to convert.
 154     if not func.checker.always_check(src_param.name):
 155         converts[True] += 1
 156
 157     for desc in func.checker.flatten(src_param.name):
 158         converts[desc.convert] += 1
 159         if converts[True] and converts[False]:
 160             break
 161
 162     # it should be "never", "sometimes", and "always"...
 163     if converts[False]:
 164         if converts[True]:
 165             conversion = "some"
 166         else:
 167             conversion = "none"
 168     else:
 169         conversion = "all"
 170
 171     return (dst_param.base_type(), conversion)
 172
 173
 174 def _MaxVecSize(func, param):
 175     """Return the largest possible size of a vector."""
 176     if not param.is_vector:
 177         return 0
 178     if param.size:
 179         return param.size
 180
 181     # need to look at all descriptions
 182     size = 0
 183     for desc in func.checker.flatten(param.name):
 184         if desc.size_str and desc.size_str.isdigit():
 185             s = int(desc.size_str)
 186             if s > size:
 187                 size = s
 188     if not size:
 189         need_conv = __aliases[func.name][1]
 190         if need_conv:
 191             print >>sys.stderr, \
 192                     "Error: unable to dicide the max size of %s in %s" % \
 193                     (param.name, func.name)
 194     return size
 195
 196
 197 def _ParameterTuple(func, param):
 198     """Return a parameter tuple.
 199
 200     [0] -- parameter name
 201     [1] -- parameter type
 202     [2] -- max vector size or 0
 203     [3] -- dest type the parameter converts to, or None
 204     [4] -- valid values
 205     [5] -- how often does the conversion happen
 206
 207     """
 208     vec_size = _MaxVecSize(func, param)
 209     dst_type, conversion = _Conversion(func, param)
 210     valid_values = _ValidValues(func, param)
 211
 212     return (param.name, param.type, vec_size, dst_type, valid_values, conversion)
 213
 214
 215 def Parameters(funcname):
 216     """Return list of tuples of function parameters."""
 217     func = __functions[funcname]
 218     params = []
 219     for param in func.params:
 220         params.append(_ParameterTuple(func, param))
 221
 222     return params
 223
 224
 225 def FunctionPrefix(funcname):
 226     """Return function specific prefix."""
 227     func = __functions[funcname]
 228
 229     return func.prefix
 230
 231
 232 def FindParamIndex(params, paramname):
 233     """Find the index of a named parameter."""
 234     for i in xrange(len(params)):
 235         if params[i][0] == paramname:
 236             return i
 237     return None
 238
 239
 240 def MakeDeclarationString(params):
 241     """Return a C-style parameter declaration string."""
 242     string = []
 243     for p in params:
 244         sep = "" if p[1].endswith("*") else " "
 245         string.append("%s%s%s" % (p[1], sep, p[0]))
 246     if not string:
 247         return "void"
 248     return ", ".join(string)
 249
 250
 251 def AliasPrefix(funcname):
 252     """Return the prefix of the function the named function is an alias of."""
 253     alias = __aliases[funcname][0]
 254     return alias.prefix
 255
 256
 257 def Alias(funcname):
 258     """Return the name of the function the named function is an alias of."""
 259     alias, need_conv = __aliases[funcname]
 260     return alias.name if not need_conv else None
 261
 262
 263 def ConversionFunction(funcname):
 264     """Return the name of the function the named function converts to."""
 265     alias, need_conv = __aliases[funcname]
 266     return alias.name if need_conv else None
 267
 268
 269 def Categories(funcname):
 270     """Return all the categories of the named GL function."""
 271     api = __spec["api"]
 272     return [api.name]