Add support for capturing the first frame in Vulkan.

* Defined as beginning at the creation of the first swapchain, to the
  first Present().
* This is mostly useful for samples that don't enter a proper present
  loop and just present once before exiting.

renderdoc/driver/vulkan/vk_core.cpp

@@ -852,6 +852,19 @@ void WrappedVulkan::AttemptCapture()
   }
 }
 
+void WrappedVulkan::FirstFrame(VkSwapchainKHR swap)
+{
+  SwapchainInfo *swapdesc = GetRecord(swap)->swapInfo;
+
+  // if we have to capture the first frame, begin capturing immediately
+  if(m_State == WRITING_IDLE && RenderDoc::Inst().ShouldTriggerCapture(0))
+  {
+    RenderDoc::Inst().StartFrameCapture(LayerDisp(m_Instance), swapdesc ? swapdesc->wndHandle : NULL);
+
+    m_AppControlledCapture = false;
+  }
+}
+
 bool WrappedVulkan::Serialise_BeginCaptureFrame(bool applyInitialState)
 {
   if(m_State < WRITING && !applyInitialState)

renderdoc/driver/vulkan/vk_core.h

@@ -494,6 +494,8 @@ private:
   void FinishCapture();
   void EndCaptureFrame(VkImage presentImage);
 
+  void FirstFrame(VkSwapchainKHR swap);
+
   string MakeRenderPassOpString(bool store);
 
   void StartFrameCapture(void *dev, void *wnd);

renderdoc/driver/vulkan/wrappers/vk_wsi_funcs.cpp

@@ -471,6 +471,8 @@ VkResult WrappedVulkan::vkCreateSwapchainKHR(VkDevice device,
 
         SAFE_DELETE_ARRAY(images);
       }
+
+      FirstFrame(*pSwapChain);
     }
     else
     {