1 files changed, 272 insertions, 0 deletions
diff --git a/src/mesa/main/APIspecutil.py b/src/mesa/main/APIspecutil.py
new file mode 100644
index 0000000000..9e604bb84b
--- /dev/null
+++ b/src/mesa/main/APIspecutil.py
@@ -0,0 +1,272 @@
+#!/usr/bin/python
+#
+# Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
+#
+# 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.
+"""
+Minimal apiutil.py interface for use by es_generator.py.
+"""
+
+import sys
+import libxml2
+
+import APIspec
+
+__spec = {}
+__functions = {}
+__aliases = {}
+
+def _ParseXML(filename, apiname):
+    conversions = {
+        # from           to
+        'GLfloat':  [ 'GLdouble' ],
+        'GLclampf': [ 'GLclampd' ],
+        'GLubyte':  [ 'GLfloat', 'GLdouble' ],
+        'GLint':    [ 'GLfloat', 'GLdouble' ],
+        'GLfixed':  [ 'GLfloat', 'GLdouble' ],
+        'GLclampx': [ 'GLclampf', 'GLclampd' ],
+    }
+
+    doc = libxml2.readFile(filename, None,
+            libxml2.XML_PARSE_DTDLOAD +
+            libxml2.XML_PARSE_DTDVALID +
+            libxml2.XML_PARSE_NOBLANKS)
+    spec = APIspec.Spec(doc)
+    impl = spec.get_impl()
+    api = spec.get_api(apiname)
+    doc.freeDoc()
+
+    __spec["impl"] = impl
+    __spec["api"] = api
+
+    for func in api.functions:
+        alias, need_conv = impl.match(func, conversions)
+        if not alias:
+            # external functions are manually dispatched
+            if not func.is_external:
+                print >>sys.stderr, "Error: unable to dispatch %s" % func.name
+            alias = func
+            need_conv = False
+
+        __functions[func.name] = func
+        __aliases[func.name] = (alias, need_conv)
+
+
+def AllSpecials(notused=None):
+    """Return a list of all external functions in the API."""
+    api = __spec["api"]
+
+    specials = []
+    for func in api.functions:
+        if func.is_external:
+            specials.append(func.name)
+
+    return specials
+
+
+def GetAllFunctions(filename, api):
+    """Return sorted list of all functions in the API."""
+    if not __spec:
+        _ParseXML(filename, api)
+
+    api = __spec["api"]
+    names = []
+    for func in api.functions:
+        names.append(func.name)
+    names.sort()
+    return names
+
+
+def ReturnType(funcname):
+    """Return the C return type of named function."""
+    func = __functions[funcname]
+    return func.return_type
+
+
+def Properties(funcname):
+    """Return list of properties of the named GL function."""
+    func = __functions[funcname]
+    return [func.direction]
+
+
+def _ValidValues(func, param):
+    """Return the valid values of a parameter."""
+    valid_values = []
+    switch = func.checker.switches.get(param.name, [])
+    for desc in switch:
+        # no dependent vector
+        if not desc.checker.switches:
+            for val in desc.values:
+                valid_values.append((val, None, None, [], desc.error, None))
+            continue
+
+        items = desc.checker.switches.items()
+        if len(items) > 1:
+            print >>sys.stderr, "%s: more than one parameter depend on %s" % \
+                    (func.name, desc.name)
+        dep_name, dep_switch = items[0]
+
+        for dep_desc in dep_switch:
+            if dep_desc.index >= 0 and dep_desc.index != 0:
+                print >>sys.stderr, "%s: not first element of a vector" % func.name
+            if dep_desc.checker.switches:
+                print >>sys.stderr, "%s: deep nested dependence" % func.name
+
+            convert = None if dep_desc.convert else "noconvert"
+            for val in desc.values:
+                valid_values.append((val, dep_desc.size_str, dep_desc.name,
+                                     dep_desc.values, dep_desc.error, convert))
+    return valid_values
+
+
+def _Conversion(func, src_param):
+    """Return the destination type of the conversion, or None."""
+    alias, need_conv = __aliases[func.name]
+    if need_conv:
+        dst_param = alias.get_param(src_param.name)
+        if src_param.type == dst_param.type:
+            need_conv = False
+    if not need_conv:
+        return (None, "none")
+
+    converts = { True: 0, False: 0 }
+
+    # In Fogx, for example,  pname may be GL_FOG_DENSITY/GL_FOG_START/GL_FOG_END
+    # or GL_FOG_MODE.  In the former three cases, param is not checked and the
+    # default is to convert.
+    if not func.checker.always_check(src_param.name):
+        converts[True] += 1
+
+    for desc in func.checker.flatten(src_param.name):
+        converts[desc.convert] += 1
+        if converts[True] and converts[False]:
+            break
+
+    # it should be "never", "sometimes", and "always"...
+    if converts[False]:
+        if converts[True]:
+            conversion = "some"
+        else:
+            conversion = "none"
+    else:
+        conversion = "all"
+
+    return (dst_param.base_type(), conversion)
+
+
+def _MaxVecSize(func, param):
+    """Return the largest possible size of a vector."""
+    if not param.is_vector:
+        return 0
+    if param.size:
+        return param.size
+
+    # need to look at all descriptions
+    size = 0
+    for desc in func.checker.flatten(param.name):
+        if desc.size_str and desc.size_str.isdigit():
+            s = int(desc.size_str)
+            if s > size:
+                size = s
+    if not size:
+        need_conv = __aliases[func.name][1]
+        if need_conv:
+            print >>sys.stderr, \
+                    "Error: unable to dicide the max size of %s in %s" % \
+                    (param.name, func.name)
+    return size
+
+
+def _ParameterTuple(func, param):
+    """Return a parameter tuple.
+
+    [0] -- parameter name
+    [1] -- parameter type
+    [2] -- max vector size or 0
+    [3] -- dest type the parameter converts to, or None
+    [4] -- valid values
+    [5] -- how often does the conversion happen
+
+    """
+    vec_size = _MaxVecSize(func, param)
+    dst_type, conversion = _Conversion(func, param)
+    valid_values = _ValidValues(func, param)
+
+    return (param.name, param.type, vec_size, dst_type, valid_values, conversion)
+
+
+def Parameters(funcname):
+    """Return list of tuples of function parameters."""
+    func = __functions[funcname]
+    params = []
+    for param in func.params:
+        params.append(_ParameterTuple(func, param))
+
+    return params
+
+
+def FunctionPrefix(funcname):
+    """Return function specific prefix."""
+    func = __functions[funcname]
+
+    return func.prefix
+
+
+def FindParamIndex(params, paramname):
+    """Find the index of a named parameter."""
+    for i in xrange(len(params)):
+        if params[i][0] == paramname:
+            return i
+    return None
+
+
+def MakeDeclarationString(params):
+    """Return a C-style parameter declaration string."""
+    string = []
+    for p in params:
+        sep = "" if p[1].endswith("*") else " "
+        string.append("%s%s%s" % (p[1], sep, p[0]))
+    if not string:
+        return "void"
+    return ", ".join(string)
+
+
+def AliasPrefix(funcname):
+    """Return the prefix of the function the named function is an alias of."""
+    alias = __aliases[funcname][0]
+    return alias.prefix
+
+
+def Alias(funcname):
+    """Return the name of the function the named function is an alias of."""
+    alias, need_conv = __aliases[funcname]
+    return alias.name if not need_conv else None
+
+
+def ConversionFunction(funcname):
+    """Return the name of the function the named function converts to."""
+    alias, need_conv = __aliases[funcname]
+    return alias.name if need_conv else None
+
+
+def Categories(funcname):
+    """Return all the categories of the named GL function."""
+    api = __spec["api"]
+    return [api.name]