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#!/usr/bin/env python
# $Id: glapitemp.py,v 1.7 2004/10/02 22:47:48 brianp Exp $
# Mesa 3-D graphics library
# Version: 4.1
#
# Copyright (C) 1999-2001 Brian Paul 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
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
# BRIAN PAUL 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.
# Generate the glapitemp.h file.
#
# Usage:
# gloffsets.py >glapitemp.h
#
# Dependencies:
# The apispec file must be in the current directory.
import string
import apiparser;
def PrintHead():
print """
/* DO NOT EDIT! This file is generated by the glapitemp.py script. */
/*
* This file is a template which generates the OpenGL API entry point
* functions. It should be included by a .c file which first defines
* the following macros:
* KEYWORD1 - usually nothing, but might be __declspec(dllexport) on Win32
* KEYWORD2 - usually nothing, but might be __stdcall on Win32
* NAME(n) - builds the final function name (usually add "gl" prefix)
* DISPATCH(func, args, msg) - code to do dispatch of named function.
* msg is a printf-style debug message.
* RETURN_DISPATCH(func, args, msg) - code to do dispatch with a return value
*
* Here's an example which generates the usual OpenGL functions:
* #define KEYWORD1
* #define KEYWORD2
* #define NAME(func) gl##func
* #define DISPATCH(func, args, msg) \\
* struct _glapi_table *dispatch = CurrentDispatch; \\
* (*dispatch->func) args
* #define RETURN DISPATCH(func, args, msg) \\
* struct _glapi_table *dispatch = CurrentDispatch; \\
* return (*dispatch->func) args
*
*/
#if defined( NAME )
#ifndef KEYWORD1
#define KEYWORD1
#endif
#ifndef KEYWORD2
#define KEYWORD2
#endif
#ifndef DISPATCH
#error DISPATCH must be defined
#endif
#ifndef RETURN_DISPATCH
#error RETURN_DISPATCH must be defined
#endif
"""
#enddef
def PrintTail():
print"""
#undef KEYWORD1
#undef KEYWORD2
#undef NAME
#undef DISPATCH
#undef RETURN_DISPATCH
#undef DISPATCH_TABLE_NAME
#undef UNUSED_TABLE_NAME
#undef TABLE_ENTRY
"""
#endif
def MakeParamList(nameList):
n = len(nameList)
i = 1
result = ''
for name in nameList:
result = result + name
if i < n:
result = result + ', '
i = i + 1
return result
#enddef
def Contains(haystack, needle):
if string.find(haystack, needle) >= 0:
return 1
else:
return 0
#enddef
def MakePrintfString(funcName, argTypeList, argNameList):
result = '(F, "gl%s(' % (funcName)
n = len(argTypeList)
i = 1
isPointer = {}
floatv = {}
for argType in argTypeList:
isPointer[i] = 0
floatv[i] = 0
if argType == 'GLenum':
result = result + '0x%x'
elif argType in ['GLfloat', 'GLdouble', 'GLclampf', 'GLclampd']:
result = result + '%f'
elif argType in ['GLbyte', 'GLubyte', 'GLshort', 'GLushort', 'GLint', 'GLuint', 'GLboolean', 'GLsizei']:
result = result + '%d'
else:
result = result + '%p'
isPointer[i] = 1
if argType[0:13] == 'const GLfloat' or argType[0:14] == 'const GLdouble':
if Contains(funcName, '2fv') or Contains(funcName, '2dv'):
result = result + ' /* %g, %g */'
floatv[i] = 2
elif Contains(funcName, '3fv') or Contains(funcName, '3dv'):
result = result + ' /* %g, %g, %g */'
floatv[i] = 3
elif Contains(funcName, '4fv') or Contains(funcName, '4dv'):
result = result + ' /* %g, %g, %g, %g */'
floatv[i] = 4
#endif
if i < n:
result = result + ', '
i = i + 1
#endfor
result = result + ');\\n"'
n = len(argNameList)
i = 1
if n > 0:
result = result + ', '
for pname in argNameList:
if isPointer[i]:
result = result + '(const void *) '
result = result + pname
if floatv[i] == 2:
result = result + ', ' + pname + '[0], ' + pname + '[1]'
elif floatv[i] == 3:
result = result + ', ' + pname + '[0], ' + pname + '[1], ' + pname + '[2]'
elif floatv[i] == 4:
result = result + ', ' + pname + '[0], ' + pname + '[1], ' + pname + '[2], ' + pname + '[3]'
if i < n:
result = result + ', '
i = i + 1
result = result + ')'
return result
#enddef
records = []
emittedFuncs = {}
aliasedFuncs = []
def FindOffset(funcName):
for (name, alias, offset) in records:
if name == funcName:
return offset
#endif
#endfor
return -1
#enddef
def EmitFunction(name, returnType, argTypeList, argNameList, alias, offset):
argList = apiparser.MakeArgList(argTypeList, argNameList)
parms = MakeParamList(argNameList)
printString = MakePrintfString(name, argTypeList, argNameList)
if alias == '':
dispatchName = name
else:
dispatchName = alias
if offset < 0:
offset = FindOffset(dispatchName)
if offset >= 0:
print 'KEYWORD1 %s KEYWORD2 NAME(%s)(%s)' % (returnType, name, argList)
print '{'
if returnType == 'void':
print ' DISPATCH(%s, (%s), %s);' % (dispatchName, parms, printString)
else:
print ' RETURN_DISPATCH(%s, (%s), %s);' % (dispatchName, parms, printString)
print '}'
print ''
records.append((name, dispatchName, offset))
if not emittedFuncs.has_key(offset):
emittedFuncs[offset] = name
else:
aliasedFuncs.append(name)
else:
print '/* No dispatch for %s() */' % (name)
#endif
def PrintInitDispatch():
print """
#endif /* defined( NAME ) */
/*
* This is how a dispatch table can be initialized with all the functions
* we generated above.
*/
#ifdef DISPATCH_TABLE_NAME
#ifndef TABLE_ENTRY
#error TABLE_ENTRY must be defined
#endif
void *DISPATCH_TABLE_NAME[] = {"""
keys = emittedFuncs.keys()
keys.sort()
for k in keys:
print ' TABLE_ENTRY(%s),' % (emittedFuncs[k])
print ' /* A whole bunch of no-op functions. These might be called'
print ' * when someone tries to call a dynamically-registered'
print ' * extension function without a current rendering context.'
print ' */'
for i in range(1, 100):
print ' TABLE_ENTRY(Unused),'
print '};'
print '#endif /* DISPATCH_TABLE_NAME */'
print ''
#enddef
def PrintAliasedTable():
print """
/*
* This is just used to silence compiler warnings.
* We list the functions which aren't otherwise used.
*/
#ifdef UNUSED_TABLE_NAME
void *UNUSED_TABLE_NAME[] = {"""
for alias in aliasedFuncs:
print ' TABLE_ENTRY(%s),' % (alias)
#endfor
print '};'
print '#endif /*UNUSED_TABLE_NAME*/'
print ''
#enddef
PrintHead()
apiparser.ProcessSpecFile("APIspec", EmitFunction)
PrintInitDispatch()
PrintAliasedTable()
PrintTail()
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