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#!/usr/bin/env python

# (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 

import gl_XML

import license

import sys, getopt, string

class glx_item_factory(gl_XML.gl_item_factory):

    """Factory to create GLX protocol oriented objects derived from gl_item."""

    def create_item(self, name, element, context):

        if name == "function":

            return glx_function(element, context)

        elif name == "enum":

            return glx_enum(element, context)

        elif name == "api":

            return glx_api(self)

        else:

            return gl_XML.gl_item_factory.create_item(self, name, element, context)

class glx_enum(gl_XML.gl_enum):

    def __init__(self, element, context):

        gl_XML.gl_enum.__init__(self, element, context)

        self.functions = {}

        child = element.children

        while child:

            if child.type == "element" and child.name == "size":

                n = child.nsProp( "name", None )

                c = child.nsProp( "count", None )

                m = child.nsProp( "mode", None )

                if not c:

                    c = self.default_count

                else:

                    c = int(c)

                if m == "get":

                    mode = 0

                else:

                    mode = 1

                if not self.functions.has_key(n):

                    self.functions[ n ] = [c, mode]

            child = child.next

        return

class glx_function(gl_XML.gl_function):

    def __init__(self, element, context):

        self.glx_rop = 0

        self.glx_sop = 0

        self.glx_vendorpriv = 0

        self.glx_vendorpriv_names = []

        # If this is set to true, it means that GLdouble parameters should be

        # written to the GLX protocol packet in the order they appear in the

        # prototype.  This is different from the "classic" ordering.  In the

        # classic ordering GLdoubles are written to the protocol packet first,

        # followed by non-doubles.  NV_vertex_program was the first extension

        # to break with this tradition.

        self.glx_doubles_in_order = 0

        self.vectorequiv = None

        self.output = None

        self.can_be_large = 0

        self.reply_always_array = 0

        self.dimensions_in_reply = 0

        self.img_reset = None

        self.server_handcode = 0

        self.client_handcode = 0

        self.ignore = 0

        self.count_parameter_list = []

        self.counter_list = []

        self.parameters_by_name = {}

        self.offsets_calculated = 0

        gl_XML.gl_function.__init__(self, element, context)

        return

    def process_element(self, element):

        gl_XML.gl_function.process_element(self, element)

        # If the function already has a vector equivalent set, don't

        # set it again.  This can happen if an alias to a function

        # appears after the function that it aliases.

        if not self.vectorequiv:

            self.vectorequiv = element.nsProp("vectorequiv", None)

        name = element.nsProp("name", None)

        if name == self.name:

            for param in self.parameters:

                self.parameters_by_name[ param.name ] = param

                if len(param.count_parameter_list):

                    self.count_parameter_list.extend( param.count_parameter_list )

                if param.counter and param.counter not in self.counter_list:

                    self.counter_list.append(param.counter)

        child = element.children

        while child:

            if child.type == "element" and child.name == "glx":

                rop = child.nsProp( 'rop', None )

                sop = child.nsProp( 'sop', None )

                vop = child.nsProp( 'vendorpriv', None )

                if rop:

                    self.glx_rop = int(rop)

                if sop:

                    self.glx_sop = int(sop)

                if vop:

                    self.glx_vendorpriv = int(vop)

                    self.glx_vendorpriv_names.append(name)

                self.img_reset = child.nsProp( 'img_reset', None )

                # The 'handcode' attribute can be one of 'true',

                # 'false', 'client', or 'server'.

                handcode = child.nsProp( 'handcode', None )

                if handcode == "false":

                    self.server_handcode = 0

                    self.client_handcode = 0

                elif handcode == "true":

                    self.server_handcode = 1

                    self.client_handcode = 1

                elif handcode == "client":

                    self.server_handcode = 0

                    self.client_handcode = 1

                elif handcode == "server":

                    self.server_handcode = 1

                    self.client_handcode = 0

                else:

                    raise RuntimeError('Invalid handcode mode "%s" in function "%s".' % (handcode, self.name))

                self.ignore               = gl_XML.is_attr_true( child, 'ignore' )

                self.can_be_large         = gl_XML.is_attr_true( child, 'large' )

                self.glx_doubles_in_order = gl_XML.is_attr_true( child, 'doubles_in_order' )

                self.reply_always_array   = gl_XML.is_attr_true( child, 'always_array' )

                self.dimensions_in_reply  = gl_XML.is_attr_true( child, 'dimensions_in_reply' )

            child = child.next

        # Do some validation of the GLX protocol information.  As

        # new tests are discovered, they should be added here.

        for param in self.parameters:

            if param.is_output and self.glx_rop != 0:

                raise RuntimeError("Render / RenderLarge commands cannot have outputs (%s)." % (self.name))

        return

    def has_variable_size_request(self):

        """Determine if the GLX request packet is variable sized.

        The GLX request packet is variable sized in several common

        situations.

        1. The function has a non-output parameter that is counted

           by another parameter (e.g., the 'textures' parameter of

           glDeleteTextures).

        2. The function has a non-output parameter whose count is

           determined by another parameter that is an enum (e.g., the

           'params' parameter of glLightfv).

        3. The function has a non-output parameter that is an

           image.

        4. The function must be hand-coded on the server.

        """

        if self.glx_rop == 0:

            return 0

        if self.server_handcode or self.images:

            return 1

        for param in self.parameters:

            if not param.is_output:

                if param.counter or len(param.count_parameter_list):

                    return 1

        return 0

    def variable_length_parameter(self):

        for param in self.parameters:

            if not param.is_output:

                if param.counter or len(param.count_parameter_list):

                    return param

        return None

    def calculate_offsets(self):

        if not self.offsets_calculated:

            # Calculate the offset of the first function parameter

            # in the GLX command packet.  This byte offset is

            # measured from the end of the Render / RenderLarge

            # header.  The offset for all non-pixel commends is

            # zero.  The offset for pixel commands depends on the

            # number of dimensions of the pixel data.

            if len(self.images) and not self.images[0].is_output:

                [dim, junk, junk, junk, junk] = self.images[0].get_dimensions()

                # The base size is the size of the pixel pack info

                # header used by images with the specified number

                # of dimensions.

                if dim <=  2:

                    offset = 20

                elif dim <= 4:

                    offset = 36

                else:

                    raise RuntimeError('Invalid number of dimensions %u for parameter "%s" in function "%s".' % (dim, self.image.name, self.name))

            else:

                offset = 0

            for param in self.parameterIterateGlxSend():

                if param.img_null_flag:

                    offset += 4

                if param.name != self.img_reset:

                    param.offset = offset

                    if not param.is_variable_length() and not param.is_client_only:

                        offset += param.size()

                if self.pad_after( param ):

                    offset += 4

            self.offsets_calculated = 1

        return

    def offset_of(self, param_name):

        self.calculate_offsets()

        return self.parameters_by_name[ param_name ].offset

    def parameterIterateGlxSend(self, include_variable_parameters = 1):

        """Create an iterator for parameters in GLX request order."""

        # The parameter lists are usually quite short, so it's easier

        # (i.e., less code) to just generate a new list with the

        # required elements than it is to create a new iterator class.

        temp = [ [],  [], [] ]

        for param in self.parameters:

            if param.is_output: continue

            if param.is_variable_length():

                temp[2].append( param )

            elif not self.glx_doubles_in_order and param.is_64_bit():

                temp[0].append( param )

            else:

                temp[1].append( param )

        parameters = temp[0]

        parameters.extend( temp[1] )

        if include_variable_parameters:

            parameters.extend( temp[2] )

        return parameters.__iter__()

    def parameterIterateCounters(self):

        temp = []

        for name in self.counter_list:

            temp.append( self.parameters_by_name[ name ] )

        return temp.__iter__()

    def parameterIterateOutputs(self):

        temp = []

        for p in self.parameters:

            if p.is_output:

                temp.append( p )

        return temp

    def command_fixed_length(self):

        """Return the length, in bytes as an integer, of the

        fixed-size portion of the command."""

        if len(self.parameters) == 0:

            return 0

        self.calculate_offsets()

        size = 0

        for param in self.parameterIterateGlxSend(0):

            if param.name != self.img_reset and not param.is_client_only:

                if size == 0:

                    size = param.offset + param.size()

                else:

                    size += param.size()

                if self.pad_after( param ):

                    size += 4

        for param in self.images:

            if param.img_null_flag or param.is_output:

                size += 4

        return size

    def command_variable_length(self):

        """Return the length, as a string, of the variable-sized

        portion of the command."""

        size_string = ""

        for p in self.parameterIterateGlxSend():

            if (not p.is_output) and (p.is_variable_length() or p.is_image()):

                # FIXME Replace the 1 in the size_string call

                # FIXME w/0 to eliminate some un-needed parnes

                # FIXME This would already be done, but it

                # FIXME adds some extra diffs to the generated

                # FIXME code.

                size_string = size_string + " + __GLX_PAD(%s)" % (p.size_string(1))

        return size_string

    def command_length(self):

        size = self.command_fixed_length()

        if self.glx_rop != 0:

            size += 4

        size = ((size + 3) & ~3)

        return "%u%s" % (size, self.command_variable_length())

    def opcode_real_value(self):

        """Get the true numeric value of the GLX opcode

        Behaves similarly to opcode_value, except for

        X_GLXVendorPrivate and X_GLXVendorPrivateWithReply commands.

        In these cases the value for the GLX opcode field (i.e.,

        16 for X_GLXVendorPrivate or 17 for

        X_GLXVendorPrivateWithReply) is returned.  For other 'single'

        commands, the opcode for the command (e.g., 101 for

        X_GLsop_NewList) is returned."""

        if self.glx_vendorpriv != 0:

            if self.needs_reply():

                return 17

            else:

                return 16

        else:

            return self.opcode_value()

    def opcode_value(self):

        """Get the unique protocol opcode for the glXFunction"""

        if (self.glx_rop == 0) and self.vectorequiv:

            equiv = self.context.functions_by_name[ self.vectorequiv ]

            self.glx_rop = equiv.glx_rop

        if self.glx_rop != 0:

            return self.glx_rop

        elif self.glx_sop != 0:

            return self.glx_sop

        elif self.glx_vendorpriv != 0:

            return self.glx_vendorpriv

        else:

            return -1

    def opcode_rop_basename(self):

        """Return either the name to be used for GLX protocol enum.

        Returns either the name of the function or the name of the

        name of the equivalent vector (e.g., glVertex3fv for

        glVertex3f) function."""

        if self.vectorequiv == None:

            return self.name

        else:

            return self.vectorequiv

    def opcode_name(self):

        """Get the unique protocol enum name for the glXFunction"""

        if (self.glx_rop == 0) and self.vectorequiv:

            equiv = self.context.functions_by_name[ self.vectorequiv ]

            self.glx_rop = equiv.glx_rop

            self.glx_doubles_in_order = equiv.glx_doubles_in_order

        if self.glx_rop != 0:

            return "X_GLrop_%s" % (self.opcode_rop_basename())

        elif self.glx_sop != 0:

            return "X_GLsop_%s" % (self.name)

        elif self.glx_vendorpriv != 0:

            return "X_GLvop_%s" % (self.name)

        else:

            raise RuntimeError('Function "%s" has no opcode.' % (self.name))

    def opcode_vendor_name(self, name):

        if name in self.glx_vendorpriv_names:

            return "X_GLvop_%s" % (name)

        else:

            raise RuntimeError('Function "%s" has no VendorPrivate opcode.' % (name))

    def opcode_real_name(self):

        """Get the true protocol enum name for the GLX opcode

        Behaves similarly to opcode_name, except for

        X_GLXVendorPrivate and X_GLXVendorPrivateWithReply commands.

        In these cases the string 'X_GLXVendorPrivate' or

        'X_GLXVendorPrivateWithReply' is returned.  For other

        single or render commands 'X_GLsop' or 'X_GLrop' plus the

        name of the function returned."""

        if self.glx_vendorpriv != 0:

            if self.needs_reply():

                return "X_GLXVendorPrivateWithReply"

            else:

                return "X_GLXVendorPrivate"

        else:

            return self.opcode_name()

    def needs_reply(self):

        try:

            x = self._needs_reply

        except Exception, e:

            x = 0

            if self.return_type != 'void':

                x = 1

            for param in self.parameters:

                if param.is_output:

                    x = 1

                    break

            self._needs_reply = x

        return x

    def pad_after(self, p):

        """Returns the name of the field inserted after the

        specified field to pad out the command header."""

        for image in self.images:

            if image.img_pad_dimensions:

                if not image.height:

                    if p.name == image.width:

                        return "height"

                    elif p.name == image.img_xoff:

                        return "yoffset"

                elif not image.extent:

                    if p.name == image.depth:

                        # Should this be "size4d"?

                        return "extent"

                    elif p.name == image.img_zoff:

                        return "woffset"

        return None

    def has_different_protocol(self, name):

        """Returns true if the named version of the function uses different protocol from the other versions.

        Some functions, such as glDeleteTextures and

        glDeleteTexturesEXT are functionally identical, but have

        different protocol.  This function returns true if the

        named function is an alias name and that named version uses

        different protocol from the function that is aliased.

        """

        return (name in self.glx_vendorpriv_names) and self.glx_sop

    def static_glx_name(self, name):

        if self.has_different_protocol(name):

            for n in self.glx_vendorpriv_names:

                if n in self.static_entry_points:

                    return n

        return self.static_name(name)

    def client_supported_for_indirect(self):

        """Returns true if the function is supported on the client

        side for indirect rendering."""

        return not self.ignore and (self.offset != -1) and (self.glx_rop or self.glx_sop or self.glx_vendorpriv or self.vectorequiv or self.client_handcode)

class glx_function_iterator(object):

    """Class to iterate over a list of glXFunctions"""

    def __init__(self, context):

        self.iterator = context.functionIterateByOffset()

        return

    def __iter__(self):

        return self

    def next(self):

        f = self.iterator.next()

        if f.client_supported_for_indirect():

            return f

        else:

            return self.next()

class glx_api(gl_XML.gl_api):

    def functionIterateGlx(self):

        return glx_function_iterator(self)