gpu: introduce pipeline abstraction

Modern API such as Metal and Vulkan want clients to compile expensive
state changes into pipeline objects. Change our GPU driver abstraction
to match, thereby paving the way for future drivers.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

internal/d3d11/d3d11_windows.go

@@ -1449,6 +1449,16 @@ func IUnknownQueryInterface(obj unsafe.Pointer, queryInterfaceMethod uintptr, gu
 	return ref, nil
 }
 
+func IUnknownAddRef(obj unsafe.Pointer, addRefMethod uintptr) {
+	syscall.Syscall(
+		addRefMethod,
+		1,
+		uintptr(obj),
+		0,
+		0,
+	)
+}
+
 func IUnknownRelease(obj unsafe.Pointer, releaseMethod uintptr) {
 	syscall.Syscall(
 		releaseMethod,