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#!/usr/bin/env python
# coding=utf8
################################################################################
# TUTORIAL
# This script will generate GLConsts.h
#
# Step 1:
# Download the last gl.xml, egl.xml, glx.xml and wgl.xml from
# http://www.opengl.org/registry/#specfiles into a directory of your choice
#
# Step 2:
# Execute this script ./GLParseRegistryXML.py [your dir containing XML files]
#
# Step 3:
# Do not add the downloaded XML in the patch
#
# Step 4:
# Enjoy =)
#
################################################################################
# includes
import os
import sys
import xml.etree.ElementTree
################################################################################
# export management
class GLConstHeader:
def __init__(self, f):
self.f = f
def write(self, arg):
if isinstance(arg, list):
self.f.write('\n'.join(arg) + '\n')
elif isinstance(arg, (int, long)):
self.f.write('\n' * arg)
else:
self.f.write(str(arg) + '\n')
def formatFileBegin(self):
self.write([
'/* This Source Code Form is subject to the terms of the Mozilla Public',
' * License, v. 2.0. If a copy of the MPL was not distributed with this',
' * file, You can obtain one at http://mozilla.org/MPL/2.0/. */',
'',
'#ifndef GLCONSTS_H_',
'#define GLCONSTS_H_',
'',
'/**',
' * GENERATED FILE, DO NOT MODIFY DIRECTLY.',
' * This is a file generated directly from the official OpenGL registry',
' * xml available http://www.opengl.org/registry/#specfiles.',
' *',
' * To generate this file, see tutorial in \'GLParseRegistryXML.py\'.',
' */',
''
])
def formatLibBegin(self, lib):
# lib would be 'GL', 'EGL', 'GLX' or 'WGL'
self.write('// ' + lib)
def formatLibConstant(self, lib, name, value):
# lib would be 'GL', 'EGL', 'GLX' or 'WGL'
# name is the name of the const (example: MAX_TEXTURE_SIZE)
# value is the value of the const (example: 0xABCD)
define = '#define LOCAL_' + lib + '_' + name
whitespace = 60 - len(define)
if whitespace < 0:
whitespace = whitespace % 8
self.write(define + ' ' * whitespace + ' ' + value)
def formatLibEnd(self, lib):
# lib would be 'GL', 'EGL', 'GLX' or 'WGL'
self.write(2)
def formatFileEnd(self):
self.write([
'',
'#endif // GLCONSTS_H_'
])
################################################################################
# underground code
def getScriptDir():
return os.path.dirname(__file__) + '/'
def getXMLDir():
if len(sys.argv) == 1:
return './'
dirPath = sys.argv[1]
if dirPath[-1] != '/':
dirPath += '/'
return dirPath
class GLConst:
def __init__(self, lib, name, value, type):
self.lib = lib
self.name = name
self.value = value
self.type = type
class GLDatabase:
LIBS = ['GL', 'EGL', 'GLX', 'WGL']
def __init__(self):
self.consts = {}
self.libs = set(GLDatabase.LIBS)
self.vendors = set(['EXT', 'ATI'])
# there is no vendor="EXT" and vendor="ATI" in gl.xml,
# so we manualy declare them
def loadXML(self, path):
xmlPath = getXMLDir() + path
if not os.path.isfile(xmlPath):
print 'missing file "' + xmlPath + '"'
return False
tree = xml.etree.ElementTree.parse(xmlPath)
root = tree.getroot()
for enums in root.iter('enums'):
vendor = enums.get('vendor')
if not vendor:
# there some standart enums that do have the vendor attribute,
# so we fake them as ARB's enums
vendor = 'ARB'
if vendor not in self.vendors:
# we map this new vendor in the vendors set.
self.vendors.add(vendor)
namespaceType = enums.get('type')
for enum in enums:
if enum.tag != 'enum':
# this is not an enum => we skip it
continue
lib = enum.get('name').split('_')[0]
if lib not in self.libs:
# unknown library => we skip it
continue
name = enum.get('name')[len(lib) + 1:]
value = enum.get('value')
type = enum.get('type')
if not type:
# if no type specified, we get the namespace's default type
type = namespaceType
self.consts[lib + '_' + name] = GLConst(lib, name, value, type)
return True
def exportConsts(self, path):
with open(getScriptDir() + path,'w') as f:
headerFile = GLConstHeader(f)
headerFile.formatFileBegin()
constNames = self.consts.keys()
constNames.sort()
for lib in GLDatabase.LIBS:
headerFile.formatLibBegin(lib)
for constName in constNames:
const = self.consts[constName]
if const.lib != lib:
continue
headerFile.formatLibConstant(lib, const.name, const.value)
headerFile.formatLibEnd(lib)
headerFile.formatFileEnd()
glDatabase = GLDatabase()
success = glDatabase.loadXML('gl.xml')
success = success and glDatabase.loadXML('egl.xml')
success = success and glDatabase.loadXML('glx.xml')
success = success and glDatabase.loadXML('wgl.xml')
if success:
glDatabase.exportConsts('GLConsts.h')
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