DXGI_SWAP_EFFECT_DISCARD to DXGI_SWAP_EFFECT_FLIP_DISCARD

Matthias Moulin · 2018-10-26T03:56:52

After reading some articles about the DXGI flip model: DXGI flip model; For best performance, use DXGI flip model; I decided to switch my DXGI_SWAP_EFFECT_DISCARD to DXGI_SWAP_EFFECT_FLIP_DISCARD. I do not use multiple swap chains per HWND and neither do I mix GDI/D3D (only D3D writes to the swap chain). Based on the articles, it seems that I just need to change my swap chain descriptor from DXGI_SWAP_CHAIN_DESC1 swap_chain_desc = {}; swap_chain_desc.Width = m_display_configuration.GetDisplayWidth(); swap_chain_desc.Height = m_display_configuration.GetDisplayHeight(); swap_chain_desc.Format = m_display_configuration.GetDisplayFormat(); // DXGI_FORMAT_R8G8B8A8_UNORM swap_chain_desc.SampleDesc.Count = 1u; // thus no MSAA swap_chain_desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT; swap_chain_desc.BufferCount = 1u; //swap_chain_desc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD; swap_chain_desc.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH; to DXGI_SWAP_CHAIN_DESC1 swap_chain_desc = {}; swap_chain_desc.Width = m_display_configuration.GetDisplayWidth(); swap_chain_desc.Height = m_display_configuration.GetDisplayHeight(); swap_chain_desc.Format = m_display_configuration.GetDisplayFormat(); // DXGI_FORMAT_R8G8B8A8_UNORM swap_chain_desc.SampleDesc.Count = 1u; // thus no MSAA swap_chain_desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT; swap_chain_desc.BufferCount = 2u; swap_chain_desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD; swap_chain_desc.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH; Since my use case seems pretty basic, only two changes seem/are required (i.e. buffer count and swap effect). I wonder if I am missing something (though, my program compiles and runs fine)? (I still use CreateSwapChainForHwnd.) According to the last article, I can even use a R10G10B10A2_UNORM which won't get clamped depending on the desktop?

Graphics and GPU Programming Programming

Started by matt77hias April 09, 2018 05:35 PM

11 comments, last by ROGRat 6 years, 3 months ago

SoldierOfLight

2,378

April 10, 2018 04:56 PM

19 minutes ago, matt77hias said:
I also noticed a new problem: I cannot switch anymore between fullscreen and windowed mode via m_swap_chain->SetFullscreenState(FALSE/TRUE, nullptr); ?

Ah, right, forgot about that difference. For D3D11, there's no guarantee that the present path used in fullscreen will support the same sync method used to implement the waitable object. Blt model and exclusive fullscreen don't support it, only windowed flip.

matt77hias

Author

560

April 10, 2018 05:20 PM

25 minutes ago, SoldierOfLight said:
Ah, right, forgot about that difference. For D3D11, there's no guarantee that the present path used in fullscreen will support the same sync method used to implement the waitable object. Blt model and exclusive fullscreen don't support it, only windowed flip.

That is a bummer

This makes the DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT not usable for me (e.g. I still want to be able to switch between windowed and exclusive fullscreen).

I tried to change the flags on a switch, which triggers a resize (m_swap_chain->ResizeBuffers(0u, 0u, 0u, DXGI_FORMAT_UNKNOWN, flags);), but that doesn't change anything.

🧙

ROGRat

9

October 26, 2018 03:56 AM

The WaitableObject can be used in fuscreen “windowed mode” (borderless window covering the whole screen). You also need to call SwapChain.SetMaximumFrameLatency(1) when using the WaitableObject.

DXGI_SWAP_EFFECT_DISCARD to DXGI_SWAP_EFFECT_FLIP_DISCARD

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DXGI_SWAP_EFFECT_DISCARD to DXGI_SWAP_EFFECT_FLIP_DISCARD

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