C 替换NSADIMAGE(在GLLoadGen中)
使用GLLoadGen生成的总账加载器包含以下代码:C 替换NSADIMAGE(在GLLoadGen中),c,macos,opengl,C,Macos,Opengl,使用GLLoadGen生成的总账加载器包含以下代码: 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/
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 = (char*)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;
}
此函数显然加载OpenGL函数的地址name
。但是,自OSX 10.5以来,对的调用已被弃用。当前加载函数地址的方法(未弃用)是什么?,朋友可能是最好的选择。这也将使您的代码更具可移植性,因为它们在大多数Unix系统上都可用
以下是我过去在Mac OSX上加载GL函数时使用的一些代码(在10.8版上进行了测试,对于小牛来说应该仍然可以正常工作):
// Handle to the OpenGL dynlib:
static void * glLibrary;
// Path to GL on OSX. True for version 10.8.
static const char * glLibPath = "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
// Loads the OpenGL library:
void LoadGL()
{
// Load GL dynlib:
glLibrary = dlopen(glLibPath, RTLD_LAZY);
if (!glLibrary)
{
const char * error = dlerror();
// handle error
}
}
// Unloads the GL library:
void UnloadGL()
{
if (glLibrary)
{
if (dlclose(glLibrary) != 0)
{
// problem...
}
glLibrary = NULL;
}
}
// Grab a function pointer form the previously loaded GL library:
void * GetGLFunctionPointer(const char * funcName)
{
assert(funcName != NULL);
assert(glLibrary != NULL && "OpenGL dynlib not yet loaded!");
return dlsym(glLibrary, funcName);
}
// Usage example:
int main()
{
LoadGL();
void * fn = GetGLFunctionPointer("glEnable");
assert(fn != NULL);
UnloadGL();
return 0;
}