Use DComp surface handle for Swap Chain management#10023
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zadjii-msft merged 4 commits intomainfrom May 12, 2021
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Blocking for the dcomp discussion
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| wil::unique_hmodule hDComp{ LoadLibraryEx(L"Dcomp.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32) }; | ||
| RETURN_LAST_ERROR_IF(hDComp.get() == nullptr); | ||
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| auto fn = GetProcAddressByFunctionDeclaration(hDComp.get(), DCompositionCreateSurfaceHandle); |
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DO NOT AUTOMERGE (kills the stacked PRs) |
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| // actual failure from the API itself. | ||
| [[nodiscard]] HRESULT DxEngine::_CreateSurfaceHandle() noexcept | ||
| { | ||
| wil::unique_hmodule hDComp{ LoadLibraryEx(L"Dcomp.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32) }; |
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The library is technically called dcomp.dll. I know that Microsoft's prior file systems are all case insensitive unfortunately, but... you know... It might be a good idea to fix the name.
Assuming that this function is only called from the main thread you can also write:
(Removed, as making code more complex really isn't that useful...)
| _backgroundColor{ 0 }, | ||
| _selectionBackground{}, | ||
| _haveDeviceResources{ false }, | ||
| _swapChainHandle{ INVALID_HANDLE_VALUE }, |
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wil::unique_* types have default constructors and you don't need to initialize them here.
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Idle thought: should we use the APISet name for dcomp.dll? It might be more "future proof" or whatever. |
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Summary of the Pull Request
This PR changes the DxEngine to create a swapchain HANDLE, then have the TermControl attach that handle to the SwapChainPanel, rather than returning the swapchain via a
IDXGISwapChain1.I didn't write this code originally, @miniksa helped me out. The original commit was so succinct that I didn't think there was anything else to add or take away.
I'm going to need this for tear-out (#1256), so that I can have the content process create swap chain handles, then duplicate those handles out to the window process that will end up embedding the content.
References
DCompositionCreateSurfaceHandleCreateSwapChainForCompositionSurfaceHandleCreateSwapChainForCompositionPR Checklist
Detailed Description of the Pull Request / Additional comments
This reverts commit c113b65.
That commit reverted 30b8335
Validation Steps Performed
ForHwndpath, so this will still work, but I don't know if this will suddenly fail to launch on Win7 or something. Tagging in @miniksa.