Script to generate rough GLX protocol documentation (as might be seen in

an extension spec).  It's not perfect, and it doesn't support certain
functions that other scripts here can (e.g., pixel functions).  However,
it is a good start and has already proven useful to me.

diff --git a/src/mesa/glapi/glX_doc.py b/src/mesa/glapi/glX_doc.py
new file mode 100644 (file)
index 0000000..3755dbe
--- /dev/null
+++ b/src/mesa/glapi/glX_doc.py
@@ -0,0 +1,278 @@
+#!/usr/bin/python2
+
+# (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 xml.sax import saxutils
+from xml.sax import make_parser
+from xml.sax.handler import feature_namespaces
+
+import gl_XML
+import glX_XML
+import license
+import sys, getopt
+
+
+class glXDocItemFactory(glX_XML.glXItemFactory):
+       """Factory to create GLX protocol documentation oriented objects derived from glItem."""
+    
+       def create(self, context, name, attrs):
+               if name == "param":
+                       return glXDocParameter(context, name, attrs)
+               else:
+                       return glX_XML.glXItemFactory.create(self, context, name, attrs)
+
+class glXDocParameter(gl_XML.glParameter):
+       def __init__(self, context, name, attrs):
+               self.order = 1;
+               gl_XML.glParameter.__init__(self, context, name, attrs);
+
+
+       def packet_type(self):
+               """Get the type string for the packet header
+               
+               GLX protocol documentation uses type names like CARD32,
+               FLOAT64, LISTofCARD8, and ENUM.  This function converts the
+               type of the parameter to one of these names."""
+
+               list_of = ""
+               if self.is_array():
+                       list_of = "LISTof"
+
+               if self.p_type.glx_name == "":
+                       type_name = "CARD8"
+               else:
+                       type_name = self.p_type.glx_name
+
+               return "%s%s" % (list_of, type_name)
+
+       def packet_size(self):
+               p = None
+               s = self.size()
+               if s == 0:
+                       a_prod = "n"
+                       b_prod = self.p_type.size
+
+                       if self.p_count_parameters == None and self.counter != None:
+                               a_prod = self.counter
+                       elif (self.p_count_parameters != None and self.counter == None) or (self.is_output):
+                               pass
+                       elif self.p_count_parameters != None and self.counter != None:
+                               b_prod = self.counter
+                       else:
+                               raise RuntimeError("Parameter '%s' to function '%s' has size 0." % (self.name, self.context.name))
+
+                       ss = "%s*%s" % (a_prod, b_prod)
+
+                       return [ss, p]
+               else:
+                       if s % 4 != 0:
+                               p = "p"
+
+                       return [str(s), p]
+
+class PrintGlxProtoText(glX_XML.GlxProto):
+       def __init__(self):
+               glX_XML.GlxProto.__init__(self)
+               self.factory = glXDocItemFactory()
+               self.last_category = ""
+               self.license = ""
+
+       def printHeader(self):
+               return
+
+       def body_size(self, f):
+               # At some point, refactor this function and
+               # glXFunction::command_payload_length.
+
+               size = 0;
+               size_str = ""
+               pad_str = ""
+               plus = ""
+               for p in f.parameterIterator(1, 2):
+                       [s, pad] = p.packet_size()
+                       try: 
+                               size += int(s)
+                       except Exception,e:
+                               size_str += "%s%s" % (plus, s)
+                               plus = "+"
+
+                       if pad != None:
+                               pad_str = pad
+
+               return [size, size_str, pad_str]
+
+       def print_render_header(self, f):
+               [size, size_str, pad_str] = self.body_size(f)
+               size += 4;
+
+               if size_str == "":
+                       s = "%u" % ((size + 3) & ~3)
+               elif pad_str != "":
+                       s = "%u+%s+%s" % (size, size_str, pad_str)
+               else:
+                       s = "%u+%s" % (size, size_str)
+
+               print '            2        %-15s rendering command length' % (s)
+               print '            2        %-4u            rendering command opcode' % (f.glx_rop)
+               return
+
+
+       def print_single_header(self, f):
+               [size, size_str, pad_str] = self.body_size(f)
+               size = ((size + 3) / 4) + 2;
+
+               if f.glx_vendorpriv != 0:
+                       size += 1
+
+               print '            1        CARD8           opcode (X assigned)'
+               print '            1        %-4u            GLX opcode (%s)' % (f.opcode_real_value(), f.opcode_real_name())
+
+               if size_str == "":
+                       s = "%u" % (size)
+               elif pad_str != "":
+                       s = "%u+((%s+%s)/4)" % (size, size_str, pad_str)
+               else:
+                       s = "%u+((%s)/4)" % (size, size_str)
+
+               print '            2        %-15s request length' % (s)
+
+               if f.glx_vendorpriv != 0:
+                       print '            4        %-4u            vendor specific opcode' % (f.opcode_value())
+                       
+               print '            4        GLX_CONTEXT_TAG context tag'
+
+               return
+               
+       def print_reply(self, f):
+               print '          =>'
+               print '            1        1               reply'
+               print '            1                        unused'
+               print '            2        CARD16          sequence number'
+
+               if f.output == None:
+                       print '            4        0               reply length'
+               elif f.reply_always_array:
+                       print '            4        m               reply length'
+               else:
+                       print '            4        m               reply length, m = (n == 1 ? 0 : n)'
+
+
+               unused = 24
+               if f.fn_return_type != 'void':
+                       print '            4        %-15s return value' % (f.fn_return_type)
+                       unused -= 4
+               elif f.output != None:
+                       print '            4                        unused'
+                       unused -= 4
+
+               if f.output != None:
+                       print '            4        CARD32          n'
+                       unused -= 4
+
+               if f.output != None:
+                       if not f.reply_always_array:
+                               print ''
+                               print '            if (n = 1) this follows:'
+                               print ''
+                               print '            4        CARD32          %s' % (f.output.name)
+                               print '            %-2u                       unused' % (unused - 4)
+                               print ''
+                               print '            otherwise this follows:'
+                               print ''
+
+                       print '            %-2u                       unused' % (unused)
+                       p = f.output
+                       [s, pad] = p.packet_size()
+                       print '            %-8s %-15s %s' % (s, p.packet_type(), p.name)
+                       if pad != None:
+                               try:
+                                       bytes = int(s)
+                                       bytes = 4 - (bytes & 3)
+                                       print '            %-8u %-15s unused' % (bytes, "")
+                               except Exception,e:
+                                       print '            %-8s %-15s unused, %s=pad(%s)' % (pad, "", pad, s)
+               else:
+                       print '            %-2u                       unused' % (unused)
+
+
+       def print_body(self, f):
+               for p in f.parameterIterator(1, 2):
+                       [s, pad] = p.packet_size()
+                       print '            %-8s %-15s %s' % (s, p.packet_type(), p.name)
+                       if pad != None:
+                               try:
+                                       bytes = int(s)
+                                       bytes = 4 - (bytes & 3)
+                                       print '            %-8u %-15s unused' % (bytes, "")
+                               except Exception,e:
+                                       print '            %-8s %-15s unused, %s=pad(%s)' % (pad, "", pad, s)
+
+       def printFunction(self, f):
+               # At some point this should be expanded to support pixel
+               # functions, but I'm not going to lose any sleep over it now.
+
+               if f.fn_offset < 0 or f.handcode or f.ignore or f.vectorequiv or f.image:
+                       return
+
+               print '        %s' % (f.name)
+
+               if f.glx_rop != 0:
+                       self.print_render_header(f)
+               else:
+                       self.print_single_header(f)
+               
+               self.print_body(f)
+
+               if f.needs_reply():
+                       self.print_reply(f)
+
+               print ''
+               return
+
+
+if __name__ == '__main__':
+       file_name = "gl_API.xml"
+
+       try:
+               (args, trail) = getopt.getopt(sys.argv[1:], "f:")
+       except Exception,e:
+               show_usage()
+
+       for (arg,val) in args:
+               if arg == "-f":
+                       file_name = val
+
+       dh = PrintGlxProtoText()
+
+       parser = make_parser()
+       parser.setFeature(feature_namespaces, 0)
+       parser.setContentHandler(dh)
+
+       f = open(file_name)
+
+       dh.printHeader()
+       parser.parse(f)
+       dh.printFooter()