Adds D3D11 DXGI Support and COM Helper Chain

Cargo.toml

@@ -22,7 +22,7 @@ libloading = { version = "0.7", optional = true }
 
 [dependencies.winapi]
 version = "0.3"
-features = ["dxgi1_2","dxgi1_3","dxgi1_4","dxgidebug","d3d12","d3d12sdklayers","d3dcommon","d3dcompiler","dxgiformat","synchapi","winerror"]
+features = ["dxgi1_2","dxgi1_3","dxgi1_4","dxgi1_5","dxgi1_6","dxgidebug","d3d12","d3d12sdklayers","d3dcommon","d3dcompiler","dxgiformat","synchapi","winerror"]
 
 [package.metadata.docs.rs]
 default-target = "x86_64-pc-windows-msvc"

src/com.rs

@@ -31,9 +31,13 @@ impl<T> WeakPtr<T> {
         self.0
     }
 
-    pub unsafe fn mut_void(&mut self) -> *mut *mut c_void {
+    pub fn mut_void(&mut self) -> *mut *mut c_void {
         &mut self.0 as *mut *mut _ as *mut *mut _
     }
+
+    pub fn mut_self(&mut self) -> *mut *mut T {
+        &mut self.0 as *mut *mut _
+    }
 }
 
 impl<T: Interface> WeakPtr<T> {
@@ -100,3 +104,154 @@ impl<T> Hash for WeakPtr<T> {
         self.0.hash(state);
     }
 }
+
+/// Macro that allows generation of an easy to use enum for dealing with many different possible versions of a COM object.
+///
+/// Give the variants so that parents come before children. This often manifests as going up in order (1 -> 2 -> 3). This is vital for safety.
+///
+/// Three function names need to be attached to each variant. The examples are given for the MyComObject1 variant below:
+/// - the from function (`WeakPtr<actual::ComObject1> -> Self`)
+/// - the as function (`&self -> Option<WeakPtr<actual::ComObject1>>`)
+/// - the unwrap function (`&self -> WeakPtr<actual::ComObject1>` panicing on failure to cast)
+///
+/// ```no_compile,rust
+/// weak_com_inheritance_chain! {
+///     pub enum MyComObject {
+///         MyComObject(actual::ComObject), from_my_com_object; as_my_com_object, my_com_object; // First variant doesn't use "unwrap" as it can never fail
+///         MyComObject1(actual::ComObject1), from_my_com_object1, as_my_com_object1, unwrap_my_com_object1;
+///         MyComObject2(actual::ComObject2), from_my_com_object2, as_my_com_object2, unwrap_my_com_object2;
+///     }
+/// }
+/// ```
+#[macro_export]
+macro_rules! weak_com_inheritance_chain {
+    // We first match a human readable enum style, before going into the recursive section.
+    //
+    // Internal calls to the macro have either the prefix
+    // - @recursion_logic for the recursion and termination
+    // - @render_members for the actual call to fill in the members.
+    (
+        $(#[$meta:meta])*
+        $vis:vis enum $name:ident {
+            $first_variant:ident($first_type:ty), $first_from_name:ident, $first_as_name:ident, $first_unwrap_name:ident $(;)?
+            $($variant:ident($type:ty), $from_name:ident, $as_name:ident, $unwrap_name:ident);* $(;)?
+        }
+    ) => {
+        $(#[$meta])*
+        $vis enum $name {
+            $first_variant($crate::WeakPtr<$first_type>),
+            $(
+                $variant($crate::WeakPtr<$type>)
+            ),+
+        }
+        impl $name {
+            $vis unsafe fn destroy(&self) {
+                match *self {
+                    Self::$first_variant(v) => v.destroy(),
+                    $(
+                        Self::$variant(v) => v.destroy(),
+                    )*
+                }
+            }
+
+            $crate::weak_com_inheritance_chain! {
+                @recursion_logic,
+                $vis,
+                ;
+                $first_variant($first_type), $first_from_name, $first_as_name, $first_unwrap_name;
+                $($variant($type), $from_name, $as_name, $unwrap_name);*
+            }
+        }
+
+        impl std::ops::Deref for $name {
+            type Target = $crate::WeakPtr<$first_type>;
+            fn deref(&self) -> &Self::Target {
+                self.$first_unwrap_name()
+            }
+        }
+    };
+
+    // This is the iteration case of the recursion. We instantiate the member functions for the variant we
+    // are currently at, recursing on ourself for the next variant. Note we only keep track of the previous
+    // variant name, not the functions names, as those are not needed.
+    (
+        @recursion_logic,
+        $vis:vis,
+        $(,)? $($prev_variant:ident),* $(,)?;
+        $this_variant:ident($this_type:ty), $this_from_name:ident, $this_as_name:ident, $this_unwrap_name:ident $(;)?
+        $($next_variant:ident($next_type:ty), $next_from_name:ident, $next_as_name:ident, $next_unwrap_name:ident);*
+    ) => {
+        // Actually generate the members for this variant. Needs the previous and future variant names.
+        $crate::weak_com_inheritance_chain! {
+            @render_members,
+            $vis,
+            $this_from_name, $this_as_name, $this_unwrap_name;
+            $($prev_variant),*;
+            $this_variant($this_type);
+            $($next_variant),*;
+        }
+
+        // Recurse on ourselves. If there is no future variants left, we'll hit the base case as the final expansion returns no tokens.
+        $crate::weak_com_inheritance_chain! {
+            @recursion_logic,
+            $vis,
+            $($prev_variant),* , $this_variant;
+            $($next_variant($next_type), $next_from_name, $next_as_name, $next_unwrap_name);*
+        }
+    };
+    // Base case for recursion. There are no more variants left
+    (
+        @recursion_logic,
+        $vis:vis,
+        $($prev_variant:ident),*;
+    ) => {};
+
+
+    // This is where we generate the members using the given names.
+    (
+        @render_members,
+        $vis:vis,
+        $from_name:ident, $as_name:ident, $unwrap_name:ident;
+        $($prev_variant:ident),*;
+        $variant:ident($type:ty);
+        $($next_variant:ident),*;
+    ) => {
+        // Construct this enum from weak pointer to this interface. For best usability, always use the highest constructor you can. This doesn't try to upcast.
+        $vis unsafe fn $from_name(value: $crate::WeakPtr<$type>) -> Self {
+            Self::$variant(value)
+        }
+
+        // Returns Some if the value implements the interface otherwise returns None.
+        $vis fn $as_name(&self) -> Option<&$crate::WeakPtr<$type>> {
+            match *self {
+                $(
+                    Self::$prev_variant(_) => None,
+                )*
+                Self::$variant(ref v) => Some(v),
+                $(
+                    Self::$next_variant(ref v) => {
+                        // v is &WeakPtr<NextType> and se cast to &WeakPtr<Type>
+                        Some(unsafe { std::mem::transmute(v) })
+                    }
+                )*
+            }
+        }
+
+        // Returns the interface if the value implements it, otherwise panics.
+        #[track_caller]
+        $vis fn $unwrap_name(&self) -> &$crate::WeakPtr<$type> {
+            match *self {
+                $(
+                    Self::$prev_variant(_) => panic!(concat!("Tried to unwrap a ", stringify!($prev_variant), " as a ", stringify!($variant))),
+                )*
+                Self::$variant(ref v) => &*v,
+                $(
+                    Self::$next_variant(ref v) => {
+                        // v is &WeakPtr<NextType> and se cast to &WeakPtr<Type>
+                        unsafe { std::mem::transmute(v) }
+                    }
+                )*
+            }
+        }
+    };
+}

src/descriptor.rs

@@ -156,6 +156,7 @@ impl RootParameter {
 impl fmt::Debug for RootParameter {
     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
         #[derive(Debug)]
+        #[allow(dead_code)] // False-positive
         enum Inner<'a> {
             Table(&'a [DescriptorRange]),
             Constants { binding: Binding, num: u32 },