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Make sure to copy all of the buffers into the resource array for dx12. #5091

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merged 2 commits into from
Jan 19, 2024
Merged

Make sure to copy all of the buffers into the resource array for dx12. #5091

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a7a39d6
Make sure to copy all of the buffers into the resource array for dx12.
dtzxporter Jan 18, 2024
95fe938
Up the maximum frame latency on the DX12 backend to allow a larger ra…
dtzxporter Jan 18, 2024
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10 changes: 7 additions & 3 deletions wgpu-hal/src/dx12/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -660,10 +660,14 @@ impl crate::Surface<Api> for Surface {

let non_srgb_format = auxil::dxgi::conv::map_texture_format_nosrgb(config.format);

// The range for `SetMaximumFrameLatency` is 1-16 so the maximum latency requested should be 15 because we add 1.
// https://learn.microsoft.com/en-us/windows/win32/api/dxgi/nf-dxgi-idxgidevice1-setmaximumframelatency
debug_assert!(config.maximum_frame_latency <= 15);

// Nvidia recommends to use 1-2 more buffers than the maximum latency
// https://developer.nvidia.com/blog/advanced-api-performance-swap-chains/
// For high latency extra buffers seems excessive, so go with a minimum of 3 and beyond that add 1.
let swap_chain_buffer = (config.maximum_frame_latency + 1).min(3);
let swap_chain_buffer = (config.maximum_frame_latency + 1).min(16);

let swap_chain = match self.swap_chain.write().take() {
//Note: this path doesn't properly re-initialize all of the things
Expand Down Expand Up @@ -805,8 +809,8 @@ impl crate::Surface<Api> for Surface {
unsafe { swap_chain.SetMaximumFrameLatency(config.maximum_frame_latency) };
let waitable = unsafe { swap_chain.GetFrameLatencyWaitableObject() };

let mut resources = Vec::with_capacity(config.maximum_frame_latency as usize);
for i in 0..config.maximum_frame_latency {
let mut resources = Vec::with_capacity(swap_chain_buffer as usize);
for i in 0..swap_chain_buffer {
let mut resource = d3d12::Resource::null();
unsafe {
swap_chain.GetBuffer(i, &d3d12_ty::ID3D12Resource::uuidof(), resource.mut_void())
Expand Down