Expose a function to fetch the debug overlay's texture ID

renderdoc/api/replay/renderdoc_replay.h

@@ -341,6 +341,16 @@ Should only be called for texture outputs.
 )");
   virtual ResourceId GetCustomShaderTexID() = 0;
 
+  DOCUMENT(R"(Retrieves the :class:`ResourceId` containing the contents of the debug overlay
+rendering (if enabled).
+
+Should only be called for texture outputs.
+
+:return: The :class:`ResourceId` assigned to the texture with the debug overlay.
+:rtype: ResourceId
+)");
+  virtual ResourceId GetDebugOverlayTexID() = 0;
+
   DOCUMENT(R"(Retrieve the contents of a particular pixel in a texture.
 
 Should only be called for texture outputs.

renderdoc/replay/replay_controller.h

@@ -55,6 +55,7 @@ public:
   rdctype::array<uint32_t> GetHistogram(float minval, float maxval, bool channels[4]);
 
   ResourceId GetCustomShaderTexID() { return m_CustomShaderResourceId; }
+  ResourceId GetDebugOverlayTexID() { return m_OverlayResourceId; }
   PixelValue PickPixel(ResourceId texID, bool customShader, uint32_t x, uint32_t y,
                        uint32_t sliceFace, uint32_t mip, uint32_t sample);
   rdctype::pair<uint32_t, uint32_t> PickVertex(uint32_t eventID, uint32_t x, uint32_t y);

renderdoc/replay/replay_output.cpp

@@ -892,6 +892,13 @@ extern "C" RENDERDOC_API void RENDERDOC_CC ReplayOutput_GetCustomShaderTexID(IRe
     *id = output->GetCustomShaderTexID();
 }
 
+extern "C" RENDERDOC_API void RENDERDOC_CC ReplayOutput_GetDebugOverlayTexID(IReplayOutput *output,
+                                                                             ResourceId *id)
+{
+  if(id)
+    *id = output->GetDebugOverlayTexID();
+}
+
 extern "C" RENDERDOC_API void RENDERDOC_CC ReplayOutput_GetMinMax(IReplayOutput *output,
                                                                   PixelValue *minval,
                                                                   PixelValue *maxval)

renderdocui/Interop/ReplayRenderer.cs

@@ -140,6 +140,8 @@ namespace renderdoc
         
         [DllImport("renderdoc.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
         private static extern void ReplayOutput_GetCustomShaderTexID(IntPtr real, ref ResourceId texid);
+        [DllImport("renderdoc.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
+        private static extern void ReplayOutput_GetDebugOverlayTexID(IntPtr real, ref ResourceId texid);
 
         [DllImport("renderdoc.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
         private static extern void ReplayOutput_GetMinMax(IntPtr real, IntPtr outminval, IntPtr outmaxval);
@@ -203,6 +205,15 @@ namespace renderdoc
             return ret;
         }
 
+        public ResourceId GetDebugOverlayTexID()
+        {
+            ResourceId ret = ResourceId.Null;
+
+            ReplayOutput_GetDebugOverlayTexID(m_Real, ref ret);
+
+            return ret;
+        }
+
         public void GetMinMax(out PixelValue minval, out PixelValue maxval)
         {
             IntPtr mem1 = CustomMarshal.Alloc(typeof(PixelValue));