src/mesa/main/es_generator.py

   1 #*************************************************************************
   2 # Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   3 # All Rights Reserved.
   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 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9 # and/or sell copies of the Software, and to permit persons to whom the
  10 # Software is furnished to do so, subject to the following conditions:
  11 #
  12 # The above copyright notice and this permission notice shall be included
  13 # in all copies or substantial portions of the Software.
  14 #
  15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 # TUNGSTEN GRAPHICS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  19 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  20 # OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21 # SOFTWARE.
  22 #*************************************************************************
  23
  24
  25 import sys, os
  26 import APIspecutil as apiutil
  27
  28 # These dictionary entries are used for automatic conversion.
  29 # The string will be used as a format string with the conversion
  30 # variable.
  31 Converters = {
  32     'GLfloat': {
  33         'GLdouble': "(GLdouble) (%s)",
  34         'GLfixed' : "(GLint) (%s * 65536)",
  35     },
  36     'GLfixed': {
  37         'GLfloat': "(GLfloat) (%s / 65536.0f)",
  38         'GLdouble': "(GLdouble) (%s / 65536.0)",
  39     },
  40     'GLdouble': {
  41         'GLfloat': "(GLfloat) (%s)",
  42         'GLfixed': "(GLfixed) (%s * 65536)",
  43     },
  44     'GLclampf': {
  45         'GLclampd': "(GLclampd) (%s)",
  46         'GLclampx': "(GLclampx) (%s * 65536)",
  47     },
  48     'GLclampx': {
  49         'GLclampf': "(GLclampf) (%s / 65536.0f)",
  50         'GLclampd': "(GLclampd) (%s / 65536.0)",
  51     },
  52     'GLubyte': {
  53         'GLfloat': "(GLfloat) (%s / 255.0f)",
  54     },
  55 }
  56
  57 def GetBaseType(type):
  58     typeTokens = type.split(' ')
  59     baseType = None
  60     typeModifiers = []
  61     for t in typeTokens:
  62         if t in ['const', '*']:
  63             typeModifiers.append(t)
  64         else:
  65             baseType = t
  66     return (baseType, typeModifiers)
  67
  68 def ConvertValue(value, fromType, toType):
  69     """Returns a string that represents the given parameter string,
  70     type-converted if necessary."""
  71
  72     if not Converters.has_key(fromType):
  73         print >> sys.stderr, "No base converter for type '%s' found.  Ignoring." % fromType
  74         return value
  75
  76     if not Converters[fromType].has_key(toType):
  77         print >> sys.stderr, "No converter found for type '%s' to type '%s'.  Ignoring." % (fromType, toType)
  78         return value
  79
  80     # This part is simple.  Return the proper conversion.
  81     conversionString = Converters[fromType][toType]
  82     return conversionString % value
  83
  84 FormatStrings = {
  85     'GLenum' : '0x%x',
  86     'GLfloat' : '%f',
  87     'GLint' : '%d',
  88     'GLbitfield' : '0x%x',
  89 }
  90 def GetFormatString(type):
  91     if FormatStrings.has_key(type):
  92         return FormatStrings[type]
  93     else:
  94         return None
  95
  96
  97 ######################################################################
  98 # Version-specific values to be used in the main script
  99 # header: which header file to include
 100 # api: what text specifies an API-level function
 101 VersionSpecificValues = {
 102     'GLES1.1' : {
 103         'description' : 'GLES1.1 functions',
 104         'header' : 'GLES/gl.h',
 105         'extheader' : 'GLES/glext.h',
 106         'shortname' : 'es1'
 107     },
 108     'GLES2.0': {
 109         'description' : 'GLES2.0 functions',
 110         'header' : 'GLES2/gl2.h',
 111         'extheader' : 'GLES2/gl2ext.h',
 112         'shortname' : 'es2'
 113     }
 114 }
 115
 116
 117 ######################################################################
 118 # Main code for the script begins here.
 119
 120 # Get the name of the program (without the directory part) for use in
 121 # error messages.
 122 program = os.path.basename(sys.argv[0])
 123
 124 # Set default values
 125 verbose = 0
 126 functionList = "APIspec.xml"
 127 version = "GLES1.1"
 128
 129 # Allow for command-line switches
 130 import getopt, time
 131 options = "hvV:S:"
 132 try:
 133     optlist, args = getopt.getopt(sys.argv[1:], options)
 134 except getopt.GetoptError, message:
 135     sys.stderr.write("%s: %s.  Use -h for help.\n" % (program, message))
 136     sys.exit(1)
 137
 138 for option, optarg in optlist:
 139     if option == "-h":
 140         sys.stderr.write("Usage: %s [-%s]\n" % (program, options))
 141         sys.stderr.write("Parse an API specification file and generate wrapper functions for a given GLES version\n")
 142         sys.stderr.write("-h gives help\n")
 143         sys.stderr.write("-v is verbose\n")
 144         sys.stderr.write("-V specifies GLES version to generate [%s]:\n" % version)
 145         for key in VersionSpecificValues.keys():
 146             sys.stderr.write("    %s - %s\n" % (key, VersionSpecificValues[key]['description']))
 147         sys.stderr.write("-S specifies API specification file to use [%s]\n" % functionList)
 148         sys.exit(1)
 149     elif option == "-v":
 150         verbose += 1
 151     elif option == "-V":
 152         version = optarg
 153     elif option == "-S":
 154         functionList = optarg
 155
 156 # Beyond switches, we support no further command-line arguments
 157 if len(args) >  0:
 158     sys.stderr.write("%s: only switch arguments are supported - use -h for help\n" % program)
 159     sys.exit(1)
 160
 161 # If we don't have a valid version, abort.
 162 if not VersionSpecificValues.has_key(version):
 163     sys.stderr.write("%s: version '%s' is not valid - use -h for help\n" % (program, version))
 164     sys.exit(1)
 165
 166 # Grab the version-specific items we need to use
 167 versionHeader = VersionSpecificValues[version]['header']
 168 versionExtHeader = VersionSpecificValues[version]['extheader']
 169 shortname = VersionSpecificValues[version]['shortname']
 170
 171 # If we get to here, we're good to go.  The "version" parameter
 172 # directs GetDispatchedFunctions to only allow functions from
 173 # that "category" (version in our parlance).  This allows
 174 # functions with different declarations in different categories
 175 # to exist (glTexImage2D, for example, is different between
 176 # GLES1 and GLES2).
 177 keys = apiutil.GetAllFunctions(functionList, version)
 178
 179 allSpecials = apiutil.AllSpecials()
 180
 181 print """/* DO NOT EDIT *************************************************
 182  * THIS FILE AUTOMATICALLY GENERATED BY THE %s SCRIPT
 183  * API specification file:   %s
 184  * GLES version:             %s
 185  * date:                     %s
 186  */
 187 """ % (program, functionList, version, time.strftime("%Y-%m-%d %H:%M:%S"))
 188
 189 # The headers we choose are version-specific.
 190 print """
 191 #include "%s"
 192 #include "%s"
 193 #include "main/mfeatures.h"
 194
 195 #if FEATURE_%s
 196 """ % (versionHeader, versionExtHeader, shortname.upper())
 197
 198 # Everyone needs these types.
 199 print """
 200 /* These types are needed for the Mesa veneer, but are not defined in
 201  * the standard GLES headers.
 202  */
 203 typedef double GLdouble;
 204 typedef double GLclampd;
 205
 206 /* Mesa error handling requires these */
 207 extern void *_mesa_get_current_context(void);
 208 extern void _mesa_error(void *ctx, GLenum error, const char *fmtString, ... );
 209
 210 #include "main/compiler.h"
 211 #include "main/api_exec.h"
 212 #include "main/remap.h"
 213
 214 /* cannot include main/dispatch.h here */
 215 #ifdef IN_DRI_DRIVER
 216 #define _GLAPI_USE_REMAP_TABLE
 217 #endif
 218 /* glapi uses GLAPIENTRY while GLES headers define GL_APIENTRY */
 219 #ifndef GLAPIENTRY
 220 #define GLAPIENTRY GL_APIENTRY
 221 #endif
 222 #include "%sapi/glapi/glapitable.h"
 223 #include "%sapi/glapi/glapioffsets.h"
 224 #include "%sapi/glapi/glapidispatch.h"
 225
 226 #if FEATURE_remap_table
 227
 228 #if !FEATURE_GL
 229 int driDispatchRemapTable[driDispatchRemapTable_size];
 230 #endif
 231
 232 #define need_MESA_remap_table
 233
 234 #include "%sapi/main/remap_helper.h"
 235
 236 void
 237 _mesa_init_remap_table_%s(void)
 238 {
 239    _mesa_do_init_remap_table(_mesa_function_pool,
 240                              driDispatchRemapTable_size,
 241                              MESA_remap_table_functions);
 242 }
 243
 244 void
 245 _mesa_map_static_functions_%s(void)
 246 {
 247 }
 248
 249 #endif
 250
 251 typedef void (*_glapi_proc)(void); /* generic function pointer */
 252 """ % (shortname, shortname, shortname, shortname, shortname, shortname);
 253
 254 # Finally we get to the all-important functions
 255 print """/*************************************************************
 256  * Generated functions begin here
 257  */
 258 """
 259 for funcName in keys:
 260     if verbose > 0: sys.stderr.write("%s: processing function %s\n" % (program, funcName))
 261
 262     # start figuring out what this function will look like.
 263     returnType = apiutil.ReturnType(funcName)
 264     props = apiutil.Properties(funcName)
 265     params = apiutil.Parameters(funcName)
 266     declarationString = apiutil.MakeDeclarationString(params)
 267
 268     # In case of error, a function may have to return.  Make
 269     # sure we have valid return values in this case.
 270     if returnType == "void":
 271         errorReturn = "return"
 272     elif returnType == "GLboolean":
 273         errorReturn = "return GL_FALSE"
 274     else:
 275         errorReturn = "return (%s) 0" % returnType
 276
 277     # These are the output of this large calculation block.
 278     # passthroughDeclarationString: a typed set of parameters that
 279     # will be used to create the "extern" reference for the
 280     # underlying Mesa or support function.  Note that as generated
 281     # these have an extra ", " at the beginning, which will be
 282     # removed before use.
 283     #
 284     # passthroughDeclarationString: an untyped list of parameters
 285     # that will be used to call the underlying Mesa or support
 286     # function (including references to converted parameters).
 287     # This will also be generated with an extra ", " at the
 288     # beginning, which will be removed before use.
 289     #
 290     # variables: C code to create any local variables determined to
 291     # be necessary.
 292     # conversionCodeOutgoing: C code to convert application parameters
 293     # to a necessary type before calling the underlying support code.
 294     # May be empty if no conversion is required.
 295     # conversionCodeIncoming: C code to do the converse: convert
 296     # values returned by underlying Mesa code to the types needed
 297     # by the application.
 298     # Note that *either* the conversionCodeIncoming will be used (for
 299     # generated query functions), *or* the conversionCodeOutgoing will
 300     # be used (for generated non-query functions), never both.
 301     passthroughFuncName = ""
 302     passthroughDeclarationString = ""
 303     passthroughCallString = ""
 304     prefixOverride = None
 305     variables = []
 306     conversionCodeOutgoing = []
 307     conversionCodeIncoming = []
 308     switchCode = []
 309
 310     # Calculate the name of the underlying support function to call.
 311     # By default, the passthrough function is named _mesa_<funcName>.
 312     # We're allowed to override the prefix and/or the function name
 313     # for each function record, though.  The "ConversionFunction"
 314     # utility is poorly named, BTW...
 315     if funcName in allSpecials:
 316         # perform checks and pass through
 317         funcPrefix = "_check_"
 318         aliasprefix = "_es_"
 319     else:
 320         funcPrefix = "_es_"
 321         aliasprefix = apiutil.AliasPrefix(funcName)
 322     alias = apiutil.ConversionFunction(funcName)
 323     prefixOverride = apiutil.FunctionPrefix(funcName)
 324     if prefixOverride != "_mesa_":
 325         aliasprefix = apiutil.FunctionPrefix(funcName)
 326     if not alias:
 327         # There may still be a Mesa alias for the function
 328         if apiutil.Alias(funcName):
 329             passthroughFuncName = "%s%s" % (aliasprefix, apiutil.Alias(funcName))
 330         else:
 331             passthroughFuncName = "%s%s" % (aliasprefix, funcName)
 332     else: # a specific alias is provided
 333         passthroughFuncName = "%s%s" % (aliasprefix, alias)
 334
 335     # Look at every parameter: each one may have only specific
 336     # allowed values, or dependent parameters to check, or
 337     # variant-sized vector arrays to calculate
 338     for (paramName, paramType, paramMaxVecSize, paramConvertToType, paramValidValues, paramValueConversion) in params:
 339         # We'll need this below if we're doing conversions
 340         (paramBaseType, paramTypeModifiers) = GetBaseType(paramType)
 341
 342         # Conversion management.
 343         # We'll handle three cases, easiest to hardest: a parameter
 344         # that doesn't require conversion, a scalar parameter that
 345         # requires conversion, and a vector parameter that requires
 346         # conversion.
 347         if paramConvertToType == None:
 348             # Unconverted parameters are easy, whether they're vector
 349             # or scalar - just add them to the call list.  No conversions
 350             # or anything to worry about.
 351             passthroughDeclarationString += ", %s %s" % (paramType, paramName)
 352             passthroughCallString += ", %s" % paramName
 353
 354         elif paramMaxVecSize == 0: # a scalar parameter that needs conversion
 355             # A scalar to hold a converted parameter
 356             variables.append("    %s converted_%s;" % (paramConvertToType, paramName))
 357
 358             # Outgoing conversion depends on whether we have to conditionally
 359             # perform value conversion.
 360             if paramValueConversion == "none":
 361                 conversionCodeOutgoing.append("    converted_%s = (%s) %s;" % (paramName, paramConvertToType, paramName))
 362             elif paramValueConversion == "some":
 363                 # We'll need a conditional variable to keep track of
 364                 # whether we're converting values or not.
 365                 if ("    int convert_%s_value = 1;" % paramName) not in variables:
 366                     variables.append("    int convert_%s_value = 1;" % paramName)
 367
 368                 # Write code based on that conditional.
 369                 conversionCodeOutgoing.append("    if (convert_%s_value) {" % paramName)
 370                 conversionCodeOutgoing.append("        converted_%s = %s;" % (paramName, ConvertValue(paramName, paramBaseType, paramConvertToType)))
 371                 conversionCodeOutgoing.append("    } else {")
 372                 conversionCodeOutgoing.append("        converted_%s = (%s) %s;" % (paramName, paramConvertToType, paramName))
 373                 conversionCodeOutgoing.append("    }")
 374             else: # paramValueConversion == "all"
 375                 conversionCodeOutgoing.append("    converted_%s = %s;" % (paramName, ConvertValue(paramName, paramBaseType, paramConvertToType)))
 376
 377             # Note that there can be no incoming conversion for a
 378             # scalar parameter; changing the scalar will only change
 379             # the local value, and won't ultimately change anything
 380             # that passes back to the application.
 381
 382             # Call strings.  The unusual " ".join() call will join the
 383             # array of parameter modifiers with spaces as separators.
 384             passthroughDeclarationString += ", %s %s %s" % (paramConvertToType, " ".join(paramTypeModifiers), paramName)
 385             passthroughCallString += ", converted_%s" % paramName
 386
 387         else: # a vector parameter that needs conversion
 388             # We'll need an index variable for conversions
 389             if "    register unsigned int i;" not in variables:
 390                 variables.append("    register unsigned int i;")
 391
 392             # This variable will hold the (possibly variant) size of
 393             # this array needing conversion.  By default, we'll set
 394             # it to the maximal size (which is correct for functions
 395             # with a constant-sized vector parameter); for true
 396             # variant arrays, we'll modify it with other code.
 397             variables.append("    unsigned int n_%s = %d;" % (paramName, paramMaxVecSize))
 398
 399             # This array will hold the actual converted values.
 400             variables.append("    %s converted_%s[%d];" % (paramConvertToType, paramName, paramMaxVecSize))
 401
 402             # Again, we choose the conversion code based on whether we
 403             # have to always convert values, never convert values, or
 404             # conditionally convert values.
 405             if paramValueConversion == "none":
 406                 conversionCodeOutgoing.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 407                 conversionCodeOutgoing.append("        converted_%s[i] = (%s) %s[i];" % (paramName, paramConvertToType, paramName))
 408                 conversionCodeOutgoing.append("    }")
 409             elif paramValueConversion == "some":
 410                 # We'll need a conditional variable to keep track of
 411                 # whether we're converting values or not.
 412                 if ("    int convert_%s_value = 1;" % paramName) not in variables:
 413                     variables.append("    int convert_%s_value = 1;" % paramName)
 414                 # Write code based on that conditional.
 415                 conversionCodeOutgoing.append("    if (convert_%s_value) {" % paramName)
 416                 conversionCodeOutgoing.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 417                 conversionCodeOutgoing.append("            converted_%s[i] = %s;" % (paramName, ConvertValue("%s[i]" % paramName, paramBaseType, paramConvertToType)))
 418                 conversionCodeOutgoing.append("        }")
 419                 conversionCodeOutgoing.append("    } else {")
 420                 conversionCodeOutgoing.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 421                 conversionCodeOutgoing.append("            converted_%s[i] = (%s) %s[i];" % (paramName, paramConvertToType, paramName))
 422                 conversionCodeOutgoing.append("        }")
 423                 conversionCodeOutgoing.append("    }")
 424             else: # paramValueConversion == "all"
 425                 conversionCodeOutgoing.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 426                 conversionCodeOutgoing.append("        converted_%s[i] = %s;" % (paramName, ConvertValue("%s[i]" % paramName, paramBaseType, paramConvertToType)))
 427
 428                 conversionCodeOutgoing.append("    }")
 429
 430             # If instead we need an incoming conversion (i.e. results
 431             # from Mesa have to be converted before handing back
 432             # to the application), this is it.  Fortunately, we don't
 433             # have to worry about conditional value conversion - the
 434             # functions that do (e.g. glGetFixedv()) are handled
 435             # specially, outside this code generation.
 436             #
 437             # Whether we use incoming conversion or outgoing conversion
 438             # is determined later - we only ever use one or the other.
 439
 440             if paramValueConversion == "none":
 441                 conversionCodeIncoming.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 442                 conversionCodeIncoming.append("        %s[i] = (%s) converted_%s[i];" % (paramName, paramConvertToType, paramName))
 443                 conversionCodeIncoming.append("    }")
 444             elif paramValueConversion == "some":
 445                 # We'll need a conditional variable to keep track of
 446                 # whether we're converting values or not.
 447                 if ("    int convert_%s_value = 1;" % paramName) not in variables:
 448                     variables.append("    int convert_%s_value = 1;" % paramName)
 449
 450                 # Write code based on that conditional.
 451                 conversionCodeIncoming.append("    if (convert_%s_value) {" % paramName)
 452                 conversionCodeIncoming.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 453                 conversionCodeIncoming.append("            %s[i] = %s;" % (paramName, ConvertValue("converted_%s[i]" % paramName, paramConvertToType, paramBaseType)))
 454                 conversionCodeIncoming.append("        }")
 455                 conversionCodeIncoming.append("    } else {")
 456                 conversionCodeIncoming.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 457                 conversionCodeIncoming.append("            %s[i] = (%s) converted_%s[i];" % (paramName, paramBaseType, paramName))
 458                 conversionCodeIncoming.append("        }")
 459                 conversionCodeIncoming.append("    }")
 460             else: # paramValueConversion == "all"
 461                 conversionCodeIncoming.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 462                 conversionCodeIncoming.append("        %s[i] = %s;" % (paramName, ConvertValue("converted_%s[i]" % paramName, paramConvertToType, paramBaseType)))
 463                 conversionCodeIncoming.append("    }")
 464
 465             # Call strings.  The unusual " ".join() call will join the
 466             # array of parameter modifiers with spaces as separators.
 467             passthroughDeclarationString += ", %s %s %s" % (paramConvertToType, " ".join(paramTypeModifiers), paramName)
 468             passthroughCallString += ", converted_%s" % paramName
 469
 470         # endif conversion management
 471
 472         # Parameter checking.  If the parameter has a specific list of
 473         # valid values, we have to make sure that the passed-in values
 474         # match these, or we make an error.
 475         if len(paramValidValues) > 0:
 476             # We're about to make a big switch statement with an
 477             # error at the end.  By default, the error is GL_INVALID_ENUM,
 478             # unless we find a "case" statement in the middle with a
 479             # non-GLenum value.
 480             errorDefaultCase = "GL_INVALID_ENUM"
 481
 482             # This parameter has specific valid values.  Make a big
 483             # switch statement to handle it.  Note that the original
 484             # parameters are always what is checked, not the
 485             # converted parameters.
 486             switchCode.append("    switch(%s) {" % paramName)
 487
 488             for valueIndex in range(len(paramValidValues)):
 489                 (paramValue, dependentVecSize, dependentParamName, dependentValidValues, errorCode, valueConvert) = paramValidValues[valueIndex]
 490
 491                 # We're going to need information on the dependent param
 492                 # as well.
 493                 if dependentParamName:
 494                     depParamIndex = apiutil.FindParamIndex(params, dependentParamName)
 495                     if depParamIndex == None:
 496                         sys.stderr.write("%s: can't find dependent param '%s' for function '%s'\n" % (program, dependentParamName, funcName))
 497
 498                     (depParamName, depParamType, depParamMaxVecSize, depParamConvertToType, depParamValidValues, depParamValueConversion) = params[depParamIndex]
 499                 else:
 500                     (depParamName, depParamType, depParamMaxVecSize, depParamConvertToType, depParamValidValues, depParamValueConversion) = (None, None, None, None, [], None)
 501
 502                 # This is a sneaky trick.  It's valid syntax for a parameter
 503                 # that is *not* going to be converted to be declared
 504                 # with a dependent vector size; but in this case, the
 505                 # dependent vector size is unused and unnecessary.
 506                 # So check for this and ignore the dependent vector size
 507                 # if the parameter is not going to be converted.
 508                 if depParamConvertToType:
 509                     usedDependentVecSize = dependentVecSize
 510                 else:
 511                     usedDependentVecSize = None
 512
 513                 # We'll peek ahead at the next parameter, to see whether
 514                 # we can combine cases
 515                 if valueIndex + 1 < len(paramValidValues) :
 516                     (nextParamValue, nextDependentVecSize, nextDependentParamName, nextDependentValidValues, nextErrorCode, nextValueConvert) = paramValidValues[valueIndex + 1]
 517                     if depParamConvertToType:
 518                         usedNextDependentVecSize = nextDependentVecSize
 519                     else:
 520                         usedNextDependentVecSize = None
 521
 522                 # Create a case for this value.  As a mnemonic,
 523                 # if we have a dependent vector size that we're ignoring,
 524                 # add it as a comment.
 525                 if usedDependentVecSize == None and dependentVecSize != None:
 526                     switchCode.append("        case %s: /* size %s */" % (paramValue, dependentVecSize))
 527                 else:
 528                     switchCode.append("        case %s:" % paramValue)
 529
 530                 # If this is not a GLenum case, then switch our error
 531                 # if no value is matched to be GL_INVALID_VALUE instead
 532                 # of GL_INVALID_ENUM.  (Yes, this does get confused
 533                 # if there are both values and GLenums in the same
 534                 # switch statement, which shouldn't happen.)
 535                 if paramValue[0:3] != "GL_":
 536                     errorDefaultCase = "GL_INVALID_VALUE"
 537
 538                 # If all the remaining parameters are identical to the
 539                 # next set, then we're done - we'll just create the
 540                 # official code on the next pass through, and the two
 541                 # cases will share the code.
 542                 if valueIndex + 1 < len(paramValidValues) and usedDependentVecSize == usedNextDependentVecSize and dependentParamName == nextDependentParamName and dependentValidValues == nextDependentValidValues and errorCode == nextErrorCode and valueConvert == nextValueConvert:
 543                     continue
 544
 545                 # Otherwise, we'll have to generate code for this case.
 546                 # Start off with a check: if there is a dependent parameter,
 547                 # and a list of valid values for that parameter, we need
 548                 # to generate an error if something other than one
 549                 # of those values is passed.
 550                 if len(dependentValidValues) > 0:
 551                     conditional=""
 552
 553                     # If the parameter being checked is actually an array,
 554                     # check only its first element.
 555                     if depParamMaxVecSize == 0:
 556                         valueToCheck = dependentParamName
 557                     else:
 558                         valueToCheck = "%s[0]" % dependentParamName
 559
 560                     for v in dependentValidValues:
 561                         conditional += " && %s != %s" % (valueToCheck, v)
 562                     switchCode.append("            if (%s) {" % conditional[4:])
 563                     if errorCode == None:
 564                         errorCode = "GL_INVALID_ENUM"
 565                     switchCode.append('                _mesa_error(_mesa_get_current_context(), %s, "gl%s(%s=0x%s)", %s);' % (errorCode, funcName, paramName, "%x", paramName))
 566                     switchCode.append("                %s;" % errorReturn)
 567                     switchCode.append("            }")
 568                 # endif there are dependent valid values
 569
 570                 # The dependent parameter may require conditional
 571                 # value conversion.  If it does, and we don't want
 572                 # to convert values, we'll have to generate code for that
 573                 if depParamValueConversion == "some" and valueConvert == "noconvert":
 574                     switchCode.append("            convert_%s_value = 0;" % dependentParamName)
 575
 576                 # If there's a dependent vector size for this parameter
 577                 # that we're actually going to use (i.e. we need conversion),
 578                 # mark it.
 579                 if usedDependentVecSize:
 580                     switchCode.append("            n_%s = %s;" % (dependentParamName, dependentVecSize))
 581
 582                 # In all cases, break out of the switch if any valid
 583                 # value is found.
 584                 switchCode.append("            break;")
 585
 586
 587             # Need a default case to catch all the other, invalid
 588             # parameter values.  These will all generate errors.
 589             switchCode.append("        default:")
 590             if errorCode == None:
 591                 errorCode = "GL_INVALID_ENUM"
 592             formatString = GetFormatString(paramType)
 593             if formatString == None:
 594                 switchCode.append('            _mesa_error(_mesa_get_current_context(), %s, "gl%s(%s)");' % (errorCode, funcName, paramName))
 595             else:
 596                 switchCode.append('            _mesa_error(_mesa_get_current_context(), %s, "gl%s(%s=%s)", %s);' % (errorCode, funcName, paramName, formatString, paramName))
 597             switchCode.append("            %s;" % errorReturn)
 598
 599             # End of our switch code.
 600             switchCode.append("    }")
 601
 602         # endfor every recognized parameter value
 603
 604     # endfor every param
 605
 606     # Here, the passthroughDeclarationString and passthroughCallString
 607     # are complete; remove the extra ", " at the front of each.
 608     passthroughDeclarationString = passthroughDeclarationString[2:]
 609     passthroughCallString = passthroughCallString[2:]
 610     if not passthroughDeclarationString:
 611         passthroughDeclarationString = "void"
 612
 613     # The Mesa functions are scattered across all the Mesa
 614     # header files.  The easiest way to manage declarations
 615     # is to create them ourselves.
 616     if funcName in allSpecials:
 617         print "/* this function is special and is defined elsewhere */"
 618     print "extern %s GL_APIENTRY %s(%s);" % (returnType, passthroughFuncName, passthroughDeclarationString)
 619
 620     # A function may be a core function (i.e. it exists in
 621     # the core specification), a core addition (extension
 622     # functions added officially to the core), a required
 623     # extension (usually an extension for an earlier version
 624     # that has been officially adopted), or an optional extension.
 625     #
 626     # Core functions have a simple category (e.g. "GLES1.1");
 627     # we generate only a simple callback for them.
 628     #
 629     # Core additions have two category listings, one simple
 630     # and one compound (e.g.  ["GLES1.1", "GLES1.1:OES_fixed_point"]).
 631     # We generate the core function, and also an extension function.
 632     #
 633     # Required extensions and implemented optional extensions
 634     # have a single compound category "GLES1.1:OES_point_size_array".
 635     # For these we generate just the extension function.
 636     for categorySpec in apiutil.Categories(funcName):
 637         compoundCategory = categorySpec.split(":")
 638
 639         # This category isn't for us, if the base category doesn't match
 640         # our version
 641         if compoundCategory[0] != version:
 642             continue
 643
 644         # Otherwise, determine if we're writing code for a core
 645         # function (no suffix) or an extension function.
 646         if len(compoundCategory) == 1:
 647             # This is a core function
 648             extensionName = None
 649             extensionSuffix = ""
 650         else:
 651             # This is an extension function.  We'll need to append
 652             # the extension suffix.
 653             extensionName = compoundCategory[1]
 654             extensionSuffix = extensionName.split("_")[0]
 655         fullFuncName = funcPrefix + funcName + extensionSuffix
 656
 657         # Now the generated function.  The text used to mark an API-level
 658         # function, oddly, is version-specific.
 659         if extensionName:
 660             print "/* Extension %s */" % extensionName
 661
 662         if (not variables and
 663             not switchCode and
 664             not conversionCodeOutgoing and
 665             not conversionCodeIncoming):
 666             # pass through directly
 667             print "#define %s %s" % (fullFuncName, passthroughFuncName)
 668             print
 669             continue
 670
 671         print "static %s GL_APIENTRY %s(%s)" % (returnType, fullFuncName, declarationString)
 672         print "{"
 673
 674         # Start printing our code pieces.  Start with any local
 675         # variables we need.  This unusual syntax joins the
 676         # lines in the variables[] array with the "\n" separator.
 677         if len(variables) > 0:
 678             print "\n".join(variables) + "\n"
 679
 680         # If there's any sort of parameter checking or variable
 681         # array sizing, the switch code will contain it.
 682         if len(switchCode) > 0:
 683             print "\n".join(switchCode) + "\n"
 684
 685         # In the case of an outgoing conversion (i.e. parameters must
 686         # be converted before calling the underlying Mesa function),
 687         # use the appropriate code.
 688         if "get" not in props and len(conversionCodeOutgoing) > 0:
 689             print "\n".join(conversionCodeOutgoing) + "\n"
 690
 691         # Call the Mesa function.  Note that there are very few functions
 692         # that return a value (i.e. returnType is not "void"), and that
 693         # none of them require incoming translation; so we're safe
 694         # to generate code that directly returns in those cases,
 695         # even though it's not completely independent.
 696
 697         if returnType == "void":
 698             print "    %s(%s);" % (passthroughFuncName, passthroughCallString)
 699         else:
 700             print "    return %s(%s);" % (passthroughFuncName, passthroughCallString)
 701
 702         # If the function is one that returns values (i.e. "get" in props),
 703         # it might return values of a different type than we need, that
 704         # require conversion before passing back to the application.
 705         if "get" in props and len(conversionCodeIncoming) > 0:
 706             print "\n".join(conversionCodeIncoming)
 707
 708         # All done.
 709         print "}"
 710         print
 711     # end for each category provided for a function
 712
 713 # end for each function
 714
 715 print """
 716 struct _glapi_table *
 717 _mesa_create_exec_table_%s(void)
 718 {
 719    struct _glapi_table *exec;
 720    exec = _mesa_alloc_dispatch_table(sizeof *exec);
 721    if (exec == NULL)
 722       return NULL;
 723
 724 """ % shortname
 725
 726 for func in keys:
 727     prefix = "_es_" if func not in allSpecials else "_check_"
 728     for spec in apiutil.Categories(func):
 729         ext = spec.split(":")
 730         # version does not match
 731         if ext.pop(0) != version:
 732             continue
 733         entry = func
 734         if ext:
 735             suffix = ext[0].split("_")[0]
 736             entry += suffix
 737         print "    SET_%s(exec, %s%s);" % (entry, prefix, entry)
 738 print ""
 739 print "   return exec;"
 740 print "}"
 741
 742 print """
 743 #endif /* FEATURE_%s */""" % (shortname.upper())