/*
* This function queries each loaded vendor to determine if there is
* a vendor-implemented dispatch function. The dispatch function
* uses the vendor <-> API library ABI to determine the screen given
* the parameters of the function and dispatch to the correct vendor's
* implementation.
*/
__GLXextFuncPtr __glXGetGLXDispatchAddress(const GLubyte *procName)
{
__GLXextFuncPtr addr = NULL;
__GLXvendorNameHash *pEntry, *tmp;
/*
* XXX for full correctness, we should probably load vendors
* on all screens up-front before doing this. However, that
* might be bad for performance?
*/
LKDHASH_RDLOCK(__glXPthreadFuncs, __glXVendorNameHash);
HASH_ITER(hh, _LH(__glXVendorNameHash), pEntry, tmp) {
// See if the current vendor supports this GLX entry point
addr = pEntry->vendor->staticDispatch->
glxvc.getDispatchAddress(procName);
if (addr) {
// Allocate the new dispatch index.
if (!AllocDispatchIndex(pEntry->vendor, procName)) {
addr = NULL;
}
break;
}
}
/**
* Looks up a dispatch function from a vendor library.
*
* If the vendor library provides a dispatch function, then it will allocate a
* dispatch index for it.
*
* If the vendor library exports it as a normal OpenGL function, then it will
* return a dispatch function from libGLdispatch.
*
* This function is used from __glXGetGLXDispatchAddress and as the callback to
* glvndUpdateEntrypoints.
*/
static GLVNDentrypointStub __glXFindVendorDispatchAddress(const char *procName, __GLXvendorInfo *vendor)
{
__GLXextFuncPtr addr = NULL;
addr = vendor->staticDispatch->
glxvc.getDispatchAddress((const GLubyte *) procName);
if (addr != NULL) {
// Allocate the new dispatch index.
if (!AllocDispatchIndex(vendor, (const GLubyte *) procName)) {
addr = NULL;
}
return addr;
}
// If we didn't find a GLX dispatch function, then check for a normal
// OpenGL function. This should handle any case where a GL extension
// function starts with "glX".
addr = vendor->staticDispatch->glxvc.getProcAddress((const GLubyte *) procName);
if (addr != NULL) {
addr = __glDispatchGetProcAddress(procName);
}
return addr;
}
