glLoadGen / data / gl_specloaderfunc.lua

--[[ The function pointer loading function takes a string and returns either NULL or a valid pointer. It is the responsibility of the loader to take care of any platform-specific oddities in pointer fetching.
]]

return [====[
#if defined(__APPLE__)
#include <mach-o/dyld.h>

static void* AppleGLGetProcAddress (const GLubyte *name)
{
  static const struct mach_header* image = NULL;
  NSSymbol symbol;
  char* symbolName;
  if (NULL == image)
  {
    image = NSAddImage("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", NSADDIMAGE_OPTION_RETURN_ON_ERROR);
  }
  /* prepend a '_' for the Unix C symbol mangling convention */
  symbolName = malloc(strlen((const char*)name) + 2);
  strcpy(symbolName+1, (const char*)name);
  symbolName[0] = '_';
  symbol = NULL;
  /* if (NSIsSymbolNameDefined(symbolName))
	 symbol = NSLookupAndBindSymbol(symbolName); */
  symbol = image ? NSLookupSymbolInImage(image, symbolName, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR) : NULL;
  free(symbolName);
  return symbol ? NSAddressOfSymbol(symbol) : NULL;
}
#endif /* __APPLE__ */

#if defined(__sgi) || defined (__sun)
#include <dlfcn.h>
#include <stdio.h>

static void* SunGetProcAddress (const GLubyte* name)
{
  static void* h = NULL;
  static void* gpa;

  if (h == NULL)
  {
    if ((h = dlopen(NULL, RTLD_LAZY | RTLD_LOCAL)) == NULL) return NULL;
    gpa = dlsym(h, "glXGetProcAddress");
  }

  if (gpa != NULL)
    return ((void*(*)(const GLubyte*))gpa)(name);
  else
    return dlsym(h, (const char*)name);
}
#endif /* __sgi || __sun */

#if defined(_WIN32)

#ifdef _MSC_VER
#pragma warning(disable: 4055)
#pragma warning(disable: 4054)
#endif

static int TestPointer(const PROC pTest)
{
	ptrdiff_t iTest;
	if(!pTest) return 0;
	iTest = (ptrdiff_t)pTest;
	
	if(iTest == 1 || iTest == 2 || iTest == 3 || iTest == -1) return 0;
	
	return 1;
}

static PROC WinGetProcAddress(const char *name)
{
	HMODULE glMod = NULL;
	PROC pFunc = wglGetProcAddress((LPCSTR)name);
	if(TestPointer(pFunc))
	{
		return pFunc;
	}
	glMod = GetModuleHandleA("OpenGL32.dll");
	return (PROC)GetProcAddress(glMod, (LPCSTR)name);
}
	
#define IntGetProcAddress(name) WinGetProcAddress(name)
#else
	#if defined(__APPLE__)
		#define IntGetProcAddress(name) AppleGLGetProcAddress(name)
	#else
		#if defined(__sgi) || defined(__sun)
			#define IntGetProcAddress(name) SunGetProcAddress(name)
		#else /* GLX */
		    #include <GL/glx.h>

			#define IntGetProcAddress(name) (*glXGetProcAddressARB)((const GLubyte*)name)
		#endif
	#endif
#endif
]====]
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