Rémy Tassoux

Backends: DX12: Let user specifies the backbuffer count by setting ImGui_ImplDX12_InitInfo::BackBuffer and add support for a single frame in flight.

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Frames in flight can improve and stabilize the framerate, but they may also introduce some input lag, because frames are buffered ahead of time. Allowing the user to set just...

Backends: DX11: Switch to DXGI_SWAP_EFFECT_FLIP_DISCARD

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This PR is a follow-up to https://github.com/ocornut/imgui/pull/8979#issuecomment-3433295243 It is split into two commits: ### [Use DXGI_SWAP_EFFECT_FLIP_DISCARD instead of DXGI_SWAP_EFFECT_DISCARD](https://github.com/ocornut/imgui/commit/e989b8263fa0d71e5c01b16f001db4dac3c7a4af) Switching to DXGI_SWAP_EFFECT_FLIP_DISCARD is straightforward and requires changing only three lines....

Backends: DX12: Let user specifies an optional custom error handling function by setting ImGui_ImplDX12_InitInfo::CheckHrResultFn

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Add optional CheckHrResultFn member to ImGui_ImplDX12_InitInfo for custom error handling, matching Vulkan backend. Also fix a couple of missing error checks. In the example file, I changed CreateDeviceD3D to return...