public override IntPtr GetAddress(IntPtr function)
{
unsafe
{
// Add a leading underscore to the function name
// As of OpenGL 4.4, all functions are < 64 bytes
// in length. Double that just to be sure.
const int max = 128;
byte * fun = stackalloc byte[max];
byte * ptr = fun;
byte * cur = (byte *)function.ToPointer();
int i = 0;
*ptr++ = (byte)'_';
while (*cur != 0 && ++i < max)
{
*ptr++ = *cur++;
}
if (i >= max - 1)
{
Debug.Print("Function {0} too long. Loading will fail.",
Marshal.PtrToStringAnsi(function));
}
IntPtr address = IntPtr.Zero;
IntPtr symbol = IntPtr.Zero;
if (opengl != IntPtr.Zero)
{
symbol = NS.LookupSymbolInImage(opengl, new IntPtr(fun),
SymbolLookupFlags.Bind | SymbolLookupFlags.ReturnOnError);
}
if (symbol == IntPtr.Zero && opengles != IntPtr.Zero)
{
symbol = NS.LookupSymbolInImage(opengles, new IntPtr(fun),
SymbolLookupFlags.Bind | SymbolLookupFlags.ReturnOnError);
}
if (symbol != IntPtr.Zero)
{
address = NS.AddressOfSymbol(symbol);
}
return(address);
}
}