From c5ad3bbf31fd74d6514cdc0b4b62d4124474f881 Mon Sep 17 00:00:00 2001
From: Egor Yusov <egor.yusov@gmail.com>
Date: Mon, 12 Aug 2019 22:14:34 -0700
Subject: Vulkan backend: enabled multiple swap chain support (closed
 https://github.com/DiligentGraphics/DiligentCore/issues/35)

---
 .../GraphicsEngineVulkan/src/EngineFactoryVk.cpp   | 49 +++++++++++++---------
 .../GraphicsEngineVulkan/src/SwapChainVkImpl.cpp   | 17 +++++---
 2 files changed, 41 insertions(+), 25 deletions(-)

(limited to 'Graphics/GraphicsEngineVulkan')

diff --git a/Graphics/GraphicsEngineVulkan/src/EngineFactoryVk.cpp b/Graphics/GraphicsEngineVulkan/src/EngineFactoryVk.cpp
index 57b36201..13603ba7 100644
--- a/Graphics/GraphicsEngineVulkan/src/EngineFactoryVk.cpp
+++ b/Graphics/GraphicsEngineVulkan/src/EngineFactoryVk.cpp
@@ -319,29 +319,40 @@ void EngineFactoryVkImpl::CreateSwapChainVk(IRenderDevice*       pDevice,
 
     try
     {
-        auto *pDeviceVk = ValidatedCast<RenderDeviceVkImpl>( pDevice );
-        auto *pDeviceContextVk = ValidatedCast<DeviceContextVkImpl>(pImmediateContext);
-        auto &RawMemAllocator = GetRawAllocator();
-        auto *pSwapChainVk = NEW_RC_OBJ(RawMemAllocator, "SwapChainVkImpl instance", SwapChainVkImpl)(SCDesc, pDeviceVk, pDeviceContextVk, pNativeWndHandle);
+        auto* pDeviceVk = ValidatedCast<RenderDeviceVkImpl>( pDevice );
+        auto* pDeviceContextVk = ValidatedCast<DeviceContextVkImpl>(pImmediateContext);
+        auto& RawMemAllocator = GetRawAllocator();
+
+        if (pDeviceContextVk->GetSwapChain() != nullptr && SCDesc.IsPrimary)
+        {
+            LOG_ERROR_AND_THROW("Another swap chain labeled as primary has already been created. "
+                                "There must only be one primary swap chain.");
+        }
+
+
+        auto* pSwapChainVk = NEW_RC_OBJ(RawMemAllocator, "SwapChainVkImpl instance", SwapChainVkImpl)(SCDesc, pDeviceVk, pDeviceContextVk, pNativeWndHandle);
         pSwapChainVk->QueryInterface( IID_SwapChain, reinterpret_cast<IObject**>(ppSwapChain) );
 
-        pDeviceContextVk->SetSwapChain(pSwapChainVk);
-        // Bind default render target
-        pDeviceContextVk->SetRenderTargets( 0, nullptr, nullptr, RESOURCE_STATE_TRANSITION_MODE_TRANSITION );
-        // Set default viewport
-        pDeviceContextVk->SetViewports( 1, nullptr, 0, 0 );
-        
-        auto NumDeferredCtx = pDeviceVk->GetNumDeferredContexts();
-        for (size_t ctx = 0; ctx < NumDeferredCtx; ++ctx)
+        if (SCDesc.IsPrimary)
         {
-            if (auto pDeferredCtx = pDeviceVk->GetDeferredContext(ctx))
+            pDeviceContextVk->SetSwapChain(pSwapChainVk);
+            // Bind default render target
+            pDeviceContextVk->SetRenderTargets( 0, nullptr, nullptr, RESOURCE_STATE_TRANSITION_MODE_TRANSITION );
+            // Set default viewport
+            pDeviceContextVk->SetViewports( 1, nullptr, 0, 0 );
+        
+            auto NumDeferredCtx = pDeviceVk->GetNumDeferredContexts();
+            for (size_t ctx = 0; ctx < NumDeferredCtx; ++ctx)
             {
-                auto *pDeferredCtxVk = pDeferredCtx.RawPtr<DeviceContextVkImpl>();
-                pDeferredCtxVk->SetSwapChain(pSwapChainVk);
-                // We cannot bind default render target here because
-                // there is no guarantee that deferred context will be used
-                // in this frame. It is an error to bind 
-                // RTV of an inactive buffer in the swap chain
+                if (auto pDeferredCtx = pDeviceVk->GetDeferredContext(ctx))
+                {
+                    auto *pDeferredCtxVk = pDeferredCtx.RawPtr<DeviceContextVkImpl>();
+                    pDeferredCtxVk->SetSwapChain(pSwapChainVk);
+                    // We cannot bind default render target here because
+                    // there is no guarantee that deferred context will be used
+                    // in this frame. It is an error to bind 
+                    // RTV of an inactive buffer in the swap chain
+                }
             }
         }
     }
diff --git a/Graphics/GraphicsEngineVulkan/src/SwapChainVkImpl.cpp b/Graphics/GraphicsEngineVulkan/src/SwapChainVkImpl.cpp
index cf3cba5f..5988ddaa 100644
--- a/Graphics/GraphicsEngineVulkan/src/SwapChainVkImpl.cpp
+++ b/Graphics/GraphicsEngineVulkan/src/SwapChainVkImpl.cpp
@@ -543,8 +543,11 @@ void SwapChainVkImpl::Present(Uint32 SyncInterval)
         }
     }
 
-    pImmediateCtxVk->FinishFrame();
-    pDeviceVk->ReleaseStaleResources();
+    if (m_SwapChainDesc.IsPrimary)
+    {
+        pImmediateCtxVk->FinishFrame();
+        pDeviceVk->ReleaseStaleResources();
+    }
 
     if (!m_IsMinimized)
     {
@@ -561,7 +564,7 @@ void SwapChainVkImpl::Present(Uint32 SyncInterval)
         }
         DEV_CHECK_ERR(res == VK_SUCCESS, "Failed to acquire next swap chain image");
 
-        if (IsDefaultFBBound)
+        if (m_SwapChainDesc.IsPrimary && IsDefaultFBBound)
         {
             // If default framebuffer is bound, we need to call SetRenderTargets()
             // to bind new back buffer RTV
@@ -586,8 +589,10 @@ void SwapChainVkImpl::WaitForImageAcquiredFences()
 
 void SwapChainVkImpl::RecreateVulkanSwapchain(DeviceContextVkImpl* pImmediateCtxVk)
 {
-    if (pImmediateCtxVk->IsDefaultFBBound())
-        pImmediateCtxVk->ResetRenderTargets();
+    std::vector<ITextureView*> pBackBufferRTVs(m_pBackBufferRTV.size());
+    for(size_t i=0; i < m_pBackBufferRTV.size(); ++i)
+        pBackBufferRTVs[i] = m_pBackBufferRTV[i];
+    UnbindRenderTargets(pImmediateCtxVk, pBackBufferRTVs.data(), static_cast<Uint32>(m_pBackBufferRTV.size()), m_pDepthBufferDSV);
 
     RenderDeviceVkImpl* pDeviceVk = m_pRenderDevice.RawPtr<RenderDeviceVkImpl>();
     
@@ -637,7 +642,7 @@ void SwapChainVkImpl::Resize( Uint32 NewWidth, Uint32 NewHeight )
                 auto res = AcquireNextImage(pImmediateCtxVk);
                 DEV_CHECK_ERR(res == VK_SUCCESS, "Failed to acquire next image for the just resized swap chain"); (void)res;
 
-                if( bIsDefaultFBBound )
+                if (m_SwapChainDesc.IsPrimary && bIsDefaultFBBound)
                 {
                     // Set default render target and viewport
                     pDeviceContext->SetRenderTargets( 0, nullptr, nullptr, RESOURCE_STATE_TRANSITION_MODE_TRANSITION);
-- 
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