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OpenSceneGraph/src/osg/GLExtensions.cpp
Robert Osfield 113c1dfc3e From Eric Wing, "Attached is a change for GLExtensions.cpp that allows OS X to use 
dlopen/dlsym instead of NS*Symbol* functions for 10.3 or later. The
latter is now deprecated.

I'm not completely sure how to test the changes. But I compiled these
new changes in and ran the osgvertexprogram and osgshaders examples
and they seemed to display the same results as before.

With respect to the use of dlopen and dlsym, I was uncertain if the
usage should look like Sun or FreeBSD (or something else). Apple's man
pages discourage the use of RTLD_DEFAULT so I avoided the FreeBSD
implementation and copied the Sun implementation. I'm not sure if this
is correct/ideal or not."
2006-08-31 20:48:49 +00:00

346 lines
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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <osg/GLExtensions>
#include <osg/GL>
#include <osg/GLU>
#include <osg/Notify>
#include <osg/buffered_value>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <string>
#include <vector>
#include <set>
#if defined(WIN32)
#include <windows.h>
#endif
float osg::getGLVersionNumber()
{
// needs to be extended to do proper things with subversions like 1.5.1, etc.
char *versionstring = (char*) glGetString( GL_VERSION );
std::string vs( versionstring );
return( atof( vs.substr( 0, vs.find( " " ) ).c_str() ) );
}
bool osg::isGLExtensionSupported(unsigned int contextID, const char *extension)
{
typedef std::set<std::string> ExtensionSet;
static osg::buffered_object<ExtensionSet> s_extensionSetList;
static osg::buffered_object<std::string> s_rendererList;
static osg::buffered_value<int> s_initializedList;
ExtensionSet& extensionSet = s_extensionSetList[contextID];
std::string& rendererString = s_rendererList[contextID];
// if not already set up, initialize all the per graphic context values.
if (!s_initializedList[contextID])
{
s_initializedList[contextID] = 1;
// set up the renderer
const GLubyte* renderer = glGetString(GL_RENDERER);
rendererString = renderer ? (const char*)renderer : "";
// get the extension list from OpenGL.
const char* extensions = (const char*)glGetString(GL_EXTENSIONS);
if (extensions==NULL) return false;
// insert the ' ' delimiated extensions words into the extensionSet.
const char *startOfWord = extensions;
const char *endOfWord;
while ((endOfWord = strchr(startOfWord,' '))!=NULL)
{
extensionSet.insert(std::string(startOfWord,endOfWord));
startOfWord = endOfWord+1;
}
if (*startOfWord!=0) extensionSet.insert(std::string(startOfWord));
#if defined(WIN32)
// add WGL extensions to the list
typedef const char* WINAPI WGLGETEXTENSIONSSTRINGARB(HDC);
WGLGETEXTENSIONSSTRINGARB* wglGetExtensionsStringARB =
(WGLGETEXTENSIONSSTRINGARB*)getGLExtensionFuncPtr("wglGetExtensionsStringARB");
typedef const char* WINAPI WGLGETEXTENSIONSSTRINGEXT();
WGLGETEXTENSIONSSTRINGEXT* wglGetExtensionsStringEXT =
(WGLGETEXTENSIONSSTRINGEXT*)getGLExtensionFuncPtr("wglGetExtensionsStringEXT");
const char* wglextensions = 0;
if (wglGetExtensionsStringARB)
{
HDC dc = wglGetCurrentDC();
wglextensions = wglGetExtensionsStringARB(dc);
}
else if (wglGetExtensionsStringEXT)
{
wglextensions = wglGetExtensionsStringEXT();
}
if (wglextensions)
{
const char* startOfWord = wglextensions;
const char* endOfWord;
while ((endOfWord = strchr(startOfWord, ' ')))
{
extensionSet.insert(std::string(startOfWord, endOfWord));
startOfWord = endOfWord+1;
}
if (*startOfWord != 0) extensionSet.insert(std::string(startOfWord));
}
#endif
osg::notify(INFO)<<"OpenGL extensions supported by installed OpenGL drivers are:"<<std::endl;
for(ExtensionSet::iterator itr=extensionSet.begin();
itr!=extensionSet.end();
++itr)
{
osg::notify(INFO)<<" "<<*itr<<std::endl;
}
}
// true if extension found in extensionSet.
bool result = extensionSet.find(extension)!=extensionSet.end();
// now see if extension is in the extension disabled list
bool extensionDisabled = false;
if (result)
{
const std::string& disableString = getGLExtensionDisableString();
if (!disableString.empty())
{
std::string::size_type pos=0;
while ( pos!=std::string::npos && (pos=disableString.find(extension,pos))!=std::string::npos )
{
std::string::size_type previousColon = disableString.find_last_of(':',pos);
std::string::size_type previousSemiColon = disableString.find_last_of(';',pos);
std::string renderer = "";
if (previousColon!=std::string::npos)
{
if (previousSemiColon==std::string::npos) renderer = disableString.substr(0,previousColon);
else if (previousSemiColon<previousColon) renderer = disableString.substr(previousSemiColon+1,previousColon-previousSemiColon-1);
}
if (!renderer.empty())
{
// remove leading spaces if they exist.
std::string::size_type leadingSpaces = renderer.find_first_not_of(' ');
if (leadingSpaces==std::string::npos) renderer = ""; // nothing but spaces
else if (leadingSpaces!=0) renderer.erase(0,leadingSpaces);
// remove trailing spaces if they exist.
std::string::size_type trailingSpaces = renderer.find_last_not_of(' ');
if (trailingSpaces!=std::string::npos) renderer.erase(trailingSpaces+1,std::string::npos);
}
if (renderer.empty())
{
extensionDisabled = true;
break;
}
if (rendererString.find(renderer)!=std::string::npos)
{
extensionDisabled = true;
break;
}
// move the position in the disable string along so that the same extension is found multiple times
++pos;
}
}
}
if (result)
{
if (!extensionDisabled) osg::notify(INFO)<<"OpenGL extension '"<<extension<<"' is supported."<<std::endl;
else osg::notify(INFO)<<"OpenGL extension '"<<extension<<"' is supported by OpenGL\ndriver but has been disabled by osg::getGLExtensionDisableString()."<<std::endl;
}
else osg::notify(INFO)<<"OpenGL extension '"<<extension<<"' is not supported."<<std::endl;
return result && !extensionDisabled;
}
void osg::setGLExtensionDisableString(const std::string& disableString)
{
getGLExtensionDisableString() = disableString;
}
std::string& osg::getGLExtensionDisableString()
{
static const char* envVar = getenv("OSG_GL_EXTENSION_DISABLE");
static std::string s_GLExtensionDisableString(envVar?envVar:"Nothing defined");
return s_GLExtensionDisableString;
}
bool osg::isGLUExtensionSupported(unsigned int contextID, const char *extension)
{
typedef std::set<std::string> ExtensionSet;
static osg::buffered_object<ExtensionSet> s_extensionSetList;
static osg::buffered_object<std::string> s_rendererList;
static osg::buffered_value<int> s_initializedList;
ExtensionSet& extensionSet = s_extensionSetList[contextID];
std::string& rendererString = s_rendererList[contextID];
// if not already set up, initialize all the per graphic context values.
if (!s_initializedList[contextID])
{
s_initializedList[contextID] = 1;
// set up the renderer
const GLubyte* renderer = glGetString(GL_RENDERER);
rendererString = renderer ? (const char*)renderer : "";
// get the extension list from OpenGL.
const char* extensions = (const char*)gluGetString(GLU_EXTENSIONS);
if (extensions==NULL) return false;
// insert the ' ' delimiated extensions words into the extensionSet.
const char *startOfWord = extensions;
const char *endOfWord;
while ((endOfWord = strchr(startOfWord,' '))!=NULL)
{
extensionSet.insert(std::string(startOfWord,endOfWord));
startOfWord = endOfWord+1;
}
if (*startOfWord!=0) extensionSet.insert(std::string(startOfWord));
osg::notify(INFO)<<"OpenGL extensions supported by installed OpenGL drivers are:"<<std::endl;
for(ExtensionSet::iterator itr=extensionSet.begin();
itr!=extensionSet.end();
++itr)
{
osg::notify(INFO)<<" "<<*itr<<std::endl;
}
}
// true if extension found in extensionSet.
bool result = extensionSet.find(extension)!=extensionSet.end();
if (result) osg::notify(INFO)<<"OpenGL utility library extension '"<<extension<<"' is supported."<<std::endl;
else osg::notify(INFO)<<"OpenGL utility library extension '"<<extension<<"' is not supported."<<std::endl;
return result;
}
#if defined(WIN32)
#define WIN32_LEAN_AND_MEAN
#ifndef NOMINMAX
#define NOMINMAX
#endif // NOMINMAX
#include <windows.h>
#elif defined(__APPLE__)
// The NS*Symbol* stuff found in <mach-o/dyld.h> is deprecated.
// Since 10.3 (Panther) OS X has provided the dlopen/dlsym/dlclose
// family of functions under <dlfcn.h>. Since 10.4 (Tiger), Apple claimed
// the dlfcn family was significantly faster than the NS*Symbol* family.
// Since 'deprecated' needs to be taken very seriously with the
// coming of 10.5 (Leopard), it makes sense to use the dlfcn family when possible.
#include <AvailabilityMacros.h>
#if !defined(MAC_OS_X_VERSION_10_3) || (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_3)
#define USE_APPLE_LEGACY_NSSYMBOL
#include <mach-o/dyld.h>
#else
#include <dlfcn.h>
#endif
#else
#include <dlfcn.h>
#endif
void* osg::getGLExtensionFuncPtr(const char *funcName)
{
#if defined(WIN32)
return (void*)wglGetProcAddress(funcName);
#elif defined(__APPLE__)
#if defined(USE_APPLE_LEGACY_NSSYMBOL)
std::string temp( "_" );
temp += funcName; // Mac OS X prepends an underscore on function names
if ( NSIsSymbolNameDefined( temp.c_str() ) )
{
NSSymbol symbol = NSLookupAndBindSymbol( temp.c_str() );
return NSAddressOfSymbol( symbol );
} else
return NULL;
#else
// I am uncertain of the correct and ideal usage of dlsym here.
// On the surface, it would seem that the FreeBSD implementation
// would be the ideal one to copy, but ELF and Mach-o are different
// and Apple's man page says the following about using RTLD_DEFAULT:
// "This can be a costly search and should be avoided."
// The documentation mentions nothing about passing in 0 so I must
// assume the behavior is undefined.
// So I could try copying the Sun method which I think all this
// actually originated from.
// return dlsym( RTLD_DEFAULT, funcName );
static void *handle = dlopen((const char *)0L, RTLD_LAZY);
return dlsym(handle, funcName);
#endif
#elif defined (__sun)
static void *handle = dlopen((const char *)0L, RTLD_LAZY);
return dlsym(handle, funcName);
#elif defined (__sgi)
static void *handle = dlopen((const char *)0L, RTLD_LAZY);
return dlsym(handle, funcName);
#elif defined (__FreeBSD__)
return dlsym( RTLD_DEFAULT, funcName );
#elif defined (__linux__)
typedef void (*__GLXextFuncPtr)(void);
typedef __GLXextFuncPtr (*GetProcAddressARBProc)(const char*);
static GetProcAddressARBProc s_glXGetProcAddressARB = (GetProcAddressARBProc)dlsym(0, "glXGetProcAddressARB");
if (s_glXGetProcAddressARB)
{
return (void*) (s_glXGetProcAddressARB)(funcName);
}
else
{
return dlsym(0, funcName);
}
#else // all other unixes
return dlsym(0, funcName);
#endif
}
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