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[vulkan] Acquire next image immediately after presentation

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vkAcquireNextImageKHR is a blocking call, so doing this immediately after
presentation may reduce the amount of time that passes between the application
requesing presentation and presentation actually happening on the Vulkan device.

Idea based on PR #2075.
This commit is contained in:
Philip Rebohle 2021-06-01 04:44:02 +02:00
parent 0b88d0deab
commit 0fe8f2e40c
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GPG Key ID: C8CC613427A31C99
2 changed files with 25 additions and 9 deletions
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32
src/vulkan/vulkan_presenter.cpp
View File

@ -46,17 +46,18 @@ namespace dxvk::vk {
VkResult Presenter::acquireNextImage(PresenterSync& sync, uint32_t& index) {
sync = m_semaphores.at(m_frameIndex);
VkResult status = m_vkd->vkAcquireNextImageKHR(
m_vkd->device(), m_swapchain,
std::numeric_limits<uint64_t>::max(),
sync.acquire, VK_NULL_HANDLE, &m_imageIndex);
// Don't acquire more than one image at a time
if (m_acquireStatus == VK_NOT_READY) {
m_acquireStatus = m_vkd->vkAcquireNextImageKHR(m_vkd->device(),
m_swapchain, std::numeric_limits<uint64_t>::max(),
sync.acquire, VK_NULL_HANDLE, &m_imageIndex);
}
if (status != VK_SUCCESS
&& status != VK_SUBOPTIMAL_KHR)
return status;
if (m_acquireStatus != VK_SUCCESS && m_acquireStatus != VK_SUBOPTIMAL_KHR)
return m_acquireStatus;
index = m_imageIndex;
return status;
return m_acquireStatus;
}
@ -73,10 +74,22 @@ namespace dxvk::vk {
info.pImageIndices = &m_imageIndex;
info.pResults = nullptr;
VkResult status = m_vkd->vkQueuePresentKHR(m_device.queue, &info);
if (status != VK_SUCCESS && status != VK_SUBOPTIMAL_KHR)
return status;
// Try to acquire next image already, in order to hide
// potential delays from the application thread.
m_frameIndex += 1;
m_frameIndex %= m_semaphores.size();
return m_vkd->vkQueuePresentKHR(m_device.queue, &info);
sync = m_semaphores.at(m_frameIndex);
m_acquireStatus = m_vkd->vkAcquireNextImageKHR(m_vkd->device(),
m_swapchain, std::numeric_limits<uint64_t>::max(),
sync.acquire, VK_NULL_HANDLE, &m_imageIndex);
return status;
}
@ -220,6 +233,7 @@ namespace dxvk::vk {
// Invalidate indices
m_imageIndex = 0;
m_frameIndex = 0;
m_acquireStatus = VK_NOT_READY;
return VK_SUCCESS;
}

2
src/vulkan/vulkan_presenter.h
View File

@ -182,6 +182,8 @@ namespace dxvk::vk {
uint32_t m_imageIndex = 0;
uint32_t m_frameIndex = 0;
VkResult m_acquireStatus = VK_NOT_READY;
VkResult getSupportedFormats(
std::vector<VkSurfaceFormatKHR>& formats,
const PresenterDesc& desc);