src/mesa/es/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     },
 107     'GLES2.0': {
 108         'description' : 'GLES2.0 functions',
 109         'header' : 'GLES2/gl2.h',
 110         'extheader' : 'GLES2/gl2ext.h',
 111     }
 112 }
 113
 114
 115 ######################################################################
 116 # Main code for the script begins here.
 117
 118 # Get the name of the program (without the directory part) for use in
 119 # error messages.
 120 program = os.path.basename(sys.argv[0])
 121
 122 # Set default values
 123 verbose = 0
 124 functionList = "APIspec.xml"
 125 version = "GLES1.1"
 126
 127 # Allow for command-line switches
 128 import getopt, time
 129 options = "hvV:S:"
 130 try:
 131     optlist, args = getopt.getopt(sys.argv[1:], options)
 132 except getopt.GetoptError, message:
 133     sys.stderr.write("%s: %s.  Use -h for help.\n" % (program, message))
 134     sys.exit(1)
 135
 136 for option, optarg in optlist:
 137     if option == "-h":
 138         sys.stderr.write("Usage: %s [-%s]\n" % (program, options))
 139         sys.stderr.write("Parse an API specification file and generate wrapper functions for a given GLES version\n")
 140         sys.stderr.write("-h gives help\n")
 141         sys.stderr.write("-v is verbose\n")
 142         sys.stderr.write("-V specifies GLES version to generate [%s]:\n" % version)
 143         for key in VersionSpecificValues.keys():
 144             sys.stderr.write("    %s - %s\n" % (key, VersionSpecificValues[key]['description']))
 145         sys.stderr.write("-S specifies API specification file to use [%s]\n" % functionList)
 146         sys.exit(1)
 147     elif option == "-v":
 148         verbose += 1
 149     elif option == "-V":
 150         version = optarg
 151     elif option == "-S":
 152         functionList = optarg
 153
 154 # Beyond switches, we support no further command-line arguments
 155 if len(args) >  0:
 156     sys.stderr.write("%s: only switch arguments are supported - use -h for help\n" % program)
 157     sys.exit(1)
 158
 159 # If we don't have a valid version, abort.
 160 if not VersionSpecificValues.has_key(version):
 161     sys.stderr.write("%s: version '%s' is not valid - use -h for help\n" % (program, version))
 162     sys.exit(1)
 163
 164 # Grab the version-specific items we need to use
 165 versionHeader = VersionSpecificValues[version]['header']
 166 versionExtHeader = VersionSpecificValues[version]['extheader']
 167
 168 # If we get to here, we're good to go.  The "version" parameter
 169 # directs GetDispatchedFunctions to only allow functions from
 170 # that "category" (version in our parlance).  This allows
 171 # functions with different declarations in different categories
 172 # to exist (glTexImage2D, for example, is different between
 173 # GLES1 and GLES2).
 174 keys = apiutil.GetAllFunctions(functionList, version)
 175
 176 allSpecials = apiutil.AllSpecials()
 177
 178 print """/* DO NOT EDIT *************************************************
 179  * THIS FILE AUTOMATICALLY GENERATED BY THE %s SCRIPT
 180  * API specification file:   %s
 181  * GLES version:             %s
 182  * date:                     %s
 183  */
 184 """ % (program, functionList, version, time.strftime("%Y-%m-%d %H:%M:%S"))
 185
 186 # The headers we choose are version-specific.
 187 print """
 188 #include "%s"
 189 #include "%s"
 190 """ % (versionHeader, versionExtHeader)
 191
 192 # Everyone needs these types.
 193 print """
 194 /* These types are needed for the Mesa veneer, but are not defined in
 195  * the standard GLES headers.
 196  */
 197 typedef double GLdouble;
 198 typedef double GLclampd;
 199
 200 /* This type is normally in glext.h, but needed here */
 201 typedef char GLchar;
 202
 203 /* Mesa error handling requires these */
 204 extern void *_mesa_get_current_context(void);
 205 extern void _mesa_error(void *ctx, GLenum error, const char *fmtString, ... );
 206
 207 #include "main/compiler.h"
 208 #include "main/api_exec.h"
 209
 210 #include "glapi/dispatch.h"
 211
 212 typedef void (*_glapi_proc)(void); /* generic function pointer */
 213 """
 214
 215 # Finally we get to the all-important functions
 216 print """/*************************************************************
 217  * Generated functions begin here
 218  */
 219 """
 220 for funcName in keys:
 221     if verbose > 0: sys.stderr.write("%s: processing function %s\n" % (program, funcName))
 222
 223     # start figuring out what this function will look like.
 224     returnType = apiutil.ReturnType(funcName)
 225     props = apiutil.Properties(funcName)
 226     params = apiutil.Parameters(funcName)
 227     declarationString = apiutil.MakeDeclarationString(params)
 228
 229     # In case of error, a function may have to return.  Make
 230     # sure we have valid return values in this case.
 231     if returnType == "void":
 232         errorReturn = "return"
 233     elif returnType == "GLboolean":
 234         errorReturn = "return GL_FALSE"
 235     else:
 236         errorReturn = "return (%s) 0" % returnType
 237
 238     # These are the output of this large calculation block.
 239     # passthroughDeclarationString: a typed set of parameters that
 240     # will be used to create the "extern" reference for the
 241     # underlying Mesa or support function.  Note that as generated
 242     # these have an extra ", " at the beginning, which will be
 243     # removed before use.
 244     #
 245     # passthroughDeclarationString: an untyped list of parameters
 246     # that will be used to call the underlying Mesa or support
 247     # function (including references to converted parameters).
 248     # This will also be generated with an extra ", " at the
 249     # beginning, which will be removed before use.
 250     #
 251     # variables: C code to create any local variables determined to
 252     # be necessary.
 253     # conversionCodeOutgoing: C code to convert application parameters
 254     # to a necessary type before calling the underlying support code.
 255     # May be empty if no conversion is required.
 256     # conversionCodeIncoming: C code to do the converse: convert
 257     # values returned by underlying Mesa code to the types needed
 258     # by the application.
 259     # Note that *either* the conversionCodeIncoming will be used (for
 260     # generated query functions), *or* the conversionCodeOutgoing will
 261     # be used (for generated non-query functions), never both.
 262     passthroughFuncName = ""
 263     passthroughDeclarationString = ""
 264     passthroughCallString = ""
 265     variables = []
 266     conversionCodeOutgoing = []
 267     conversionCodeIncoming = []
 268     switchCode = []
 269
 270     # Calculate the name of the underlying support function to call.
 271     # By default, the passthrough function is named _mesa_<funcName>.
 272     # We're allowed to override the prefix and/or the function name
 273     # for each function record, though.  The "ConversionFunction"
 274     # utility is poorly named, BTW...
 275     aliasprefix = apiutil.AliasPrefix(funcName)
 276     alias = apiutil.ConversionFunction(funcName)
 277     if not alias:
 278         # There may still be a Mesa alias for the function
 279         if apiutil.Alias(funcName):
 280             passthroughFuncName = "%s%s" % (aliasprefix, apiutil.Alias(funcName))
 281         else:
 282             passthroughFuncName = "%s%s" % (aliasprefix, funcName)
 283     else: # a specific alias is provided
 284         passthroughFuncName = "%s%s" % (aliasprefix, alias)
 285
 286     # Look at every parameter: each one may have only specific
 287     # allowed values, or dependent parameters to check, or
 288     # variant-sized vector arrays to calculate
 289     for (paramName, paramType, paramMaxVecSize, paramConvertToType, paramValidValues, paramValueConversion) in params:
 290         # We'll need this below if we're doing conversions
 291         (paramBaseType, paramTypeModifiers) = GetBaseType(paramType)
 292
 293         # Conversion management.
 294         # We'll handle three cases, easiest to hardest: a parameter
 295         # that doesn't require conversion, a scalar parameter that
 296         # requires conversion, and a vector parameter that requires
 297         # conversion.
 298         if paramConvertToType == None:
 299             # Unconverted parameters are easy, whether they're vector
 300             # or scalar - just add them to the call list.  No conversions
 301             # or anything to worry about.
 302             passthroughDeclarationString += ", %s %s" % (paramType, paramName)
 303             passthroughCallString += ", %s" % paramName
 304
 305         elif paramMaxVecSize == 0: # a scalar parameter that needs conversion
 306             # A scalar to hold a converted parameter
 307             variables.append("    %s converted_%s;" % (paramConvertToType, paramName))
 308
 309             # Outgoing conversion depends on whether we have to conditionally
 310             # perform value conversion.
 311             if paramValueConversion == "none":
 312                 conversionCodeOutgoing.append("    converted_%s = (%s) %s;" % (paramName, paramConvertToType, paramName))
 313             elif paramValueConversion == "some":
 314                 # We'll need a conditional variable to keep track of
 315                 # whether we're converting values or not.
 316                 if ("    int convert_%s_value = 1;" % paramName) not in variables:
 317                     variables.append("    int convert_%s_value = 1;" % paramName)
 318
 319                 # Write code based on that conditional.
 320                 conversionCodeOutgoing.append("    if (convert_%s_value) {" % paramName)
 321                 conversionCodeOutgoing.append("        converted_%s = %s;" % (paramName, ConvertValue(paramName, paramBaseType, paramConvertToType)))
 322                 conversionCodeOutgoing.append("    } else {")
 323                 conversionCodeOutgoing.append("        converted_%s = (%s) %s;" % (paramName, paramConvertToType, paramName))
 324                 conversionCodeOutgoing.append("    }")
 325             else: # paramValueConversion == "all"
 326                 conversionCodeOutgoing.append("    converted_%s = %s;" % (paramName, ConvertValue(paramName, paramBaseType, paramConvertToType)))
 327
 328             # Note that there can be no incoming conversion for a
 329             # scalar parameter; changing the scalar will only change
 330             # the local value, and won't ultimately change anything
 331             # that passes back to the application.
 332
 333             # Call strings.  The unusual " ".join() call will join the
 334             # array of parameter modifiers with spaces as separators.
 335             passthroughDeclarationString += ", %s %s %s" % (paramConvertToType, " ".join(paramTypeModifiers), paramName)
 336             passthroughCallString += ", converted_%s" % paramName
 337
 338         else: # a vector parameter that needs conversion
 339             # We'll need an index variable for conversions
 340             if "    register unsigned int i;" not in variables:
 341                 variables.append("    register unsigned int i;")
 342
 343             # This variable will hold the (possibly variant) size of
 344             # this array needing conversion.  By default, we'll set
 345             # it to the maximal size (which is correct for functions
 346             # with a constant-sized vector parameter); for true
 347             # variant arrays, we'll modify it with other code.
 348             variables.append("    unsigned int n_%s = %d;" % (paramName, paramMaxVecSize))
 349
 350             # This array will hold the actual converted values.
 351             variables.append("    %s converted_%s[%d];" % (paramConvertToType, paramName, paramMaxVecSize))
 352
 353             # Again, we choose the conversion code based on whether we
 354             # have to always convert values, never convert values, or
 355             # conditionally convert values.
 356             if paramValueConversion == "none":
 357                 conversionCodeOutgoing.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 358                 conversionCodeOutgoing.append("        converted_%s[i] = (%s) %s[i];" % (paramName, paramConvertToType, paramName))
 359                 conversionCodeOutgoing.append("    }")
 360             elif paramValueConversion == "some":
 361                 # We'll need a conditional variable to keep track of
 362                 # whether we're converting values or not.
 363                 if ("    int convert_%s_value = 1;" % paramName) not in variables:
 364                     variables.append("    int convert_%s_value = 1;" % paramName)
 365                 # Write code based on that conditional.
 366                 conversionCodeOutgoing.append("    if (convert_%s_value) {" % paramName)
 367                 conversionCodeOutgoing.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 368                 conversionCodeOutgoing.append("            converted_%s[i] = %s;" % (paramName, ConvertValue("%s[i]" % paramName, paramBaseType, paramConvertToType)))
 369                 conversionCodeOutgoing.append("        }")
 370                 conversionCodeOutgoing.append("    } else {")
 371                 conversionCodeOutgoing.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 372                 conversionCodeOutgoing.append("            converted_%s[i] = (%s) %s[i];" % (paramName, paramConvertToType, paramName))
 373                 conversionCodeOutgoing.append("        }")
 374                 conversionCodeOutgoing.append("    }")
 375             else: # paramValueConversion == "all"
 376                 conversionCodeOutgoing.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 377                 conversionCodeOutgoing.append("        converted_%s[i] = %s;" % (paramName, ConvertValue("%s[i]" % paramName, paramBaseType, paramConvertToType)))
 378
 379                 conversionCodeOutgoing.append("    }")
 380
 381             # If instead we need an incoming conversion (i.e. results
 382             # from Mesa have to be converted before handing back
 383             # to the application), this is it.  Fortunately, we don't
 384             # have to worry about conditional value conversion - the
 385             # functions that do (e.g. glGetFixedv()) are handled
 386             # specially, outside this code generation.
 387             #
 388             # Whether we use incoming conversion or outgoing conversion
 389             # is determined later - we only ever use one or the other.
 390
 391             if paramValueConversion == "none":
 392                 conversionCodeIncoming.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 393                 conversionCodeIncoming.append("        %s[i] = (%s) converted_%s[i];" % (paramName, paramConvertToType, paramName))
 394                 conversionCodeIncoming.append("    }")
 395             elif paramValueConversion == "some":
 396                 # We'll need a conditional variable to keep track of
 397                 # whether we're converting values or not.
 398                 if ("    int convert_%s_value = 1;" % paramName) not in variables:
 399                     variables.append("    int convert_%s_value = 1;" % paramName)
 400
 401                 # Write code based on that conditional.
 402                 conversionCodeIncoming.append("    if (convert_%s_value) {" % paramName)
 403                 conversionCodeIncoming.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 404                 conversionCodeIncoming.append("            %s[i] = %s;" % (paramName, ConvertValue("converted_%s[i]" % paramName, paramConvertToType, paramBaseType)))
 405                 conversionCodeIncoming.append("        }")
 406                 conversionCodeIncoming.append("    } else {")
 407                 conversionCodeIncoming.append("        for (i = 0; i < n_%s; i++) {" % paramName)
 408                 conversionCodeIncoming.append("            %s[i] = (%s) converted_%s[i];" % (paramName, paramBaseType, paramName))
 409                 conversionCodeIncoming.append("        }")
 410                 conversionCodeIncoming.append("    }")
 411             else: # paramValueConversion == "all"
 412                 conversionCodeIncoming.append("    for (i = 0; i < n_%s; i++) {" % paramName)
 413                 conversionCodeIncoming.append("        %s[i] = %s;" % (paramName, ConvertValue("converted_%s[i]" % paramName, paramConvertToType, paramBaseType)))
 414                 conversionCodeIncoming.append("    }")
 415
 416             # Call strings.  The unusual " ".join() call will join the
 417             # array of parameter modifiers with spaces as separators.
 418             passthroughDeclarationString += ", %s %s %s" % (paramConvertToType, " ".join(paramTypeModifiers), paramName)
 419             passthroughCallString += ", converted_%s" % paramName
 420
 421         # endif conversion management
 422
 423         # Parameter checking.  If the parameter has a specific list of
 424         # valid values, we have to make sure that the passed-in values
 425         # match these, or we make an error.
 426         if len(paramValidValues) > 0:
 427             # We're about to make a big switch statement with an
 428             # error at the end.  By default, the error is GL_INVALID_ENUM,
 429             # unless we find a "case" statement in the middle with a
 430             # non-GLenum value.
 431             errorDefaultCase = "GL_INVALID_ENUM"
 432
 433             # This parameter has specific valid values.  Make a big
 434             # switch statement to handle it.  Note that the original
 435             # parameters are always what is checked, not the
 436             # converted parameters.
 437             switchCode.append("    switch(%s) {" % paramName)
 438
 439             for valueIndex in range(len(paramValidValues)):
 440                 (paramValue, dependentVecSize, dependentParamName, dependentValidValues, errorCode, valueConvert) = paramValidValues[valueIndex]
 441
 442                 # We're going to need information on the dependent param
 443                 # as well.
 444                 if dependentParamName:
 445                     depParamIndex = apiutil.FindParamIndex(params, dependentParamName)
 446                     if depParamIndex == None:
 447                         sys.stderr.write("%s: can't find dependent param '%s' for function '%s'\n" % (program, dependentParamName, funcName))
 448
 449                     (depParamName, depParamType, depParamMaxVecSize, depParamConvertToType, depParamValidValues, depParamValueConversion) = params[depParamIndex]
 450                 else:
 451                     (depParamName, depParamType, depParamMaxVecSize, depParamConvertToType, depParamValidValues, depParamValueConversion) = (None, None, None, None, [], None)
 452
 453                 # This is a sneaky trick.  It's valid syntax for a parameter
 454                 # that is *not* going to be converted to be declared
 455                 # with a dependent vector size; but in this case, the
 456                 # dependent vector size is unused and unnecessary.
 457                 # So check for this and ignore the dependent vector size
 458                 # if the parameter is not going to be converted.
 459                 if depParamConvertToType:
 460                     usedDependentVecSize = dependentVecSize
 461                 else:
 462                     usedDependentVecSize = None
 463
 464                 # We'll peek ahead at the next parameter, to see whether
 465                 # we can combine cases
 466                 if valueIndex + 1 < len(paramValidValues) :
 467                     (nextParamValue, nextDependentVecSize, nextDependentParamName, nextDependentValidValues, nextErrorCode, nextValueConvert) = paramValidValues[valueIndex + 1]
 468                     if depParamConvertToType:
 469                         usedNextDependentVecSize = nextDependentVecSize
 470                     else:
 471                         usedNextDependentVecSize = None
 472
 473                 # Create a case for this value.  As a mnemonic,
 474                 # if we have a dependent vector size that we're ignoring,
 475                 # add it as a comment.
 476                 if usedDependentVecSize == None and dependentVecSize != None:
 477                     switchCode.append("        case %s: /* size %s */" % (paramValue, dependentVecSize))
 478                 else:
 479                     switchCode.append("        case %s:" % paramValue)
 480
 481                 # If this is not a GLenum case, then switch our error
 482                 # if no value is matched to be GL_INVALID_VALUE instead
 483                 # of GL_INVALID_ENUM.  (Yes, this does get confused
 484                 # if there are both values and GLenums in the same
 485                 # switch statement, which shouldn't happen.)
 486                 if paramValue[0:3] != "GL_":
 487                     errorDefaultCase = "GL_INVALID_VALUE"
 488
 489                 # If all the remaining parameters are identical to the
 490                 # next set, then we're done - we'll just create the
 491                 # official code on the next pass through, and the two
 492                 # cases will share the code.
 493                 if valueIndex + 1 < len(paramValidValues) and usedDependentVecSize == usedNextDependentVecSize and dependentParamName == nextDependentParamName and dependentValidValues == nextDependentValidValues and errorCode == nextErrorCode and valueConvert == nextValueConvert:
 494                     continue
 495
 496                 # Otherwise, we'll have to generate code for this case.
 497                 # Start off with a check: if there is a dependent parameter,
 498                 # and a list of valid values for that parameter, we need
 499                 # to generate an error if something other than one
 500                 # of those values is passed.
 501                 if len(dependentValidValues) > 0:
 502                     conditional=""
 503
 504                     # If the parameter being checked is actually an array,
 505                     # check only its first element.
 506                     if depParamMaxVecSize == 0:
 507                         valueToCheck = dependentParamName
 508                     else:
 509                         valueToCheck = "%s[0]" % dependentParamName
 510
 511                     for v in dependentValidValues:
 512                         conditional += " && %s != %s" % (valueToCheck, v)
 513                     switchCode.append("            if (%s) {" % conditional[4:])
 514                     if errorCode == None:
 515                         errorCode = "GL_INVALID_ENUM"
 516                     switchCode.append('                _mesa_error(_mesa_get_current_context(), %s, "gl%s(%s=0x%s)", %s);' % (errorCode, funcName, paramName, "%x", paramName))
 517                     switchCode.append("                %s;" % errorReturn)
 518                     switchCode.append("            }")
 519                 # endif there are dependent valid values
 520
 521                 # The dependent parameter may require conditional
 522                 # value conversion.  If it does, and we don't want
 523                 # to convert values, we'll have to generate code for that
 524                 if depParamValueConversion == "some" and valueConvert == "noconvert":
 525                     switchCode.append("            convert_%s_value = 0;" % dependentParamName)
 526
 527                 # If there's a dependent vector size for this parameter
 528                 # that we're actually going to use (i.e. we need conversion),
 529                 # mark it.
 530                 if usedDependentVecSize:
 531                     switchCode.append("            n_%s = %s;" % (dependentParamName, dependentVecSize))
 532
 533                 # In all cases, break out of the switch if any valid
 534                 # value is found.
 535                 switchCode.append("            break;")
 536
 537
 538             # Need a default case to catch all the other, invalid
 539             # parameter values.  These will all generate errors.
 540             switchCode.append("        default:")
 541             if errorCode == None:
 542                 errorCode = "GL_INVALID_ENUM"
 543             formatString = GetFormatString(paramType)
 544             if formatString == None:
 545                 switchCode.append('            _mesa_error(_mesa_get_current_context(), %s, "gl%s(%s)");' % (errorCode, funcName, paramName))
 546             else:
 547                 switchCode.append('            _mesa_error(_mesa_get_current_context(), %s, "gl%s(%s=%s)", %s);' % (errorCode, funcName, paramName, formatString, paramName))
 548             switchCode.append("            %s;" % errorReturn)
 549
 550             # End of our switch code.
 551             switchCode.append("    }")
 552
 553         # endfor every recognized parameter value
 554
 555     # endfor every param
 556
 557     # Here, the passthroughDeclarationString and passthroughCallString
 558     # are complete; remove the extra ", " at the front of each.
 559     passthroughDeclarationString = passthroughDeclarationString[2:]
 560     passthroughCallString = passthroughCallString[2:]
 561
 562     # The Mesa functions are scattered across all the Mesa
 563     # header files.  The easiest way to manage declarations
 564     # is to create them ourselves.
 565     if funcName not in allSpecials:
 566         print "extern %s GLAPIENTRY %s(%s);" % (returnType, passthroughFuncName, passthroughDeclarationString)
 567
 568     # A function may be a core function (i.e. it exists in
 569     # the core specification), a core addition (extension
 570     # functions added officially to the core), a required
 571     # extension (usually an extension for an earlier version
 572     # that has been officially adopted), or an optional extension.
 573     #
 574     # Core functions have a simple category (e.g. "GLES1.1");
 575     # we generate only a simple callback for them.
 576     #
 577     # Core additions have two category listings, one simple
 578     # and one compound (e.g.  ["GLES1.1", "GLES1.1:OES_fixed_point"]).
 579     # We generate the core function, and also an extension function.
 580     #
 581     # Required extensions and implemented optional extensions
 582     # have a single compound category "GLES1.1:OES_point_size_array".
 583     # For these we generate just the extension function.
 584     for categorySpec in apiutil.Categories(funcName):
 585         compoundCategory = categorySpec.split(":")
 586
 587         # This category isn't for us, if the base category doesn't match
 588         # our version
 589         if compoundCategory[0] != version:
 590             continue
 591
 592         # Otherwise, determine if we're writing code for a core
 593         # function (no suffix) or an extension function.
 594         if len(compoundCategory) == 1:
 595             # This is a core function
 596             extensionName = None
 597             fullFuncName = "_es_" + funcName
 598         else:
 599             # This is an extension function.  We'll need to append
 600             # the extension suffix.
 601             extensionName = compoundCategory[1]
 602             extensionSuffix = extensionName.split("_")[0]
 603             fullFuncName = "_es_" + funcName + extensionSuffix
 604
 605         # Now the generated function.  The text used to mark an API-level
 606         # function, oddly, is version-specific.
 607         if extensionName:
 608             print "/* Extension %s */" % extensionName
 609
 610         if funcName in allSpecials:
 611             print "/* this function is special and is defined elsewhere */"
 612             print "extern %s %s(%s);" % (returnType, fullFuncName, declarationString)
 613             print
 614             continue
 615
 616         print "static %s %s(%s)" % (returnType, fullFuncName, declarationString)
 617         print "{"
 618
 619         # Start printing our code pieces.  Start with any local
 620         # variables we need.  This unusual syntax joins the
 621         # lines in the variables[] array with the "\n" separator.
 622         if len(variables) > 0:
 623             print "\n".join(variables) + "\n"
 624
 625         # If there's any sort of parameter checking or variable
 626         # array sizing, the switch code will contain it.
 627         if len(switchCode) > 0:
 628             print "\n".join(switchCode) + "\n"
 629
 630         # In the case of an outgoing conversion (i.e. parameters must
 631         # be converted before calling the underlying Mesa function),
 632         # use the appropriate code.
 633         if "get" not in props and len(conversionCodeOutgoing) > 0:
 634             print "\n".join(conversionCodeOutgoing) + "\n"
 635
 636         # Call the Mesa function.  Note that there are very few functions
 637         # that return a value (i.e. returnType is not "void"), and that
 638         # none of them require incoming translation; so we're safe
 639         # to generate code that directly returns in those cases,
 640         # even though it's not completely independent.
 641
 642         if returnType == "void":
 643             print "    %s(%s);" % (passthroughFuncName, passthroughCallString)
 644         else:
 645             print "    return %s(%s);" % (passthroughFuncName, passthroughCallString)
 646
 647         # If the function is one that returns values (i.e. "get" in props),
 648         # it might return values of a different type than we need, that
 649         # require conversion before passing back to the application.
 650         if "get" in props and len(conversionCodeIncoming) > 0:
 651             print "\n".join(conversionCodeIncoming)
 652
 653         # All done.
 654         print "}"
 655         print
 656     # end for each category provided for a function
 657
 658 # end for each function
 659
 660 print "void"
 661 print "_mesa_init_exec_table(struct _glapi_table *exec)"
 662 print "{"
 663 for func in keys:
 664     for spec in apiutil.Categories(func):
 665         ext = spec.split(":")
 666         # version does not match
 667         if ext.pop(0) != version:
 668             continue
 669         entry = func
 670         if ext:
 671             suffix = ext[0].split("_")[0]
 672             entry += suffix
 673         print "    SET_%s(exec, _es_%s);" % (entry, entry)
 674 print "}"