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Proper semaphore setup

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For details see https://docs.vulkan.org/guide/latest/swapchain_semaphore_reuse.html
Fixes #1217
This commit is contained in:
Sascha Willems 2025-06-25 21:22:08 +02:00
parent d92eee9b8b
commit d7903488eb
2 changed files with 34 additions and 34 deletions
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34
examples/triangle/triangle.cpp
View file

@ -110,9 +110,8 @@ public:
std::array<VkCommandBuffer, MAX_CONCURRENT_FRAMES> commandBuffers{};
std::array<VkFence, MAX_CONCURRENT_FRAMES> waitFences{};
// To select the correct sync and command objects, we need to keep track of the current frame and (swapchain) image index
// To select the correct sync and command objects, we need to keep track of the current frame
uint32_t currentFrame{ 0 };
uint32_t currentSemaphore{ 0 };
VulkanExample() : VulkanExampleBase()
{
@ -189,16 +188,19 @@ public:
// Fence used to ensure that command buffer has completed exection before using it again
VK_CHECK_RESULT(vkCreateFence(device, &fenceCI, nullptr, &waitFences[i]));
}
// Semaphores are per swapchain image
presentCompleteSemaphores.resize(swapChain.images.size());
renderCompleteSemaphores.resize(swapChain.images.size());
for (size_t i = 0; i < swapChain.images.size(); i++) {
// Semaphores are used for correct command ordering within a queue
// Semaphores are used for correct command ordering within a queue
// Used to ensure that image presentation is complete before starting to submit again
presentCompleteSemaphores.resize(MAX_CONCURRENT_FRAMES);
for (auto& semaphore : presentCompleteSemaphores) {
VkSemaphoreCreateInfo semaphoreCI{ VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO };
// Semaphore used to ensure that image presentation is complete before starting to submit again
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &presentCompleteSemaphores[i]));
// Semaphore used to ensure that all commands submitted have been finished before submitting the image to the queue
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &renderCompleteSemaphores[i]));
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &semaphore));
}
// Render completion
// Semaphore used to ensure that all commands submitted have been finished before submitting the image to the queue
renderCompleteSemaphores.resize(swapChain.images.size());
for (auto& semaphore : renderCompleteSemaphores) {
VkSemaphoreCreateInfo semaphoreCI{ VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO };
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &semaphore));
}
}
@ -915,7 +917,7 @@ public:
// Get the next swap chain image from the implementation
// Note that the implementation is free to return the images in any order, so we must use the acquire function and can't just cycle through the images/imageIndex on our own
uint32_t imageIndex;
VkResult result = vkAcquireNextImageKHR(device, swapChain.swapChain, UINT64_MAX, presentCompleteSemaphores[currentSemaphore], VK_NULL_HANDLE, &imageIndex);
VkResult result = vkAcquireNextImageKHR(device, swapChain.swapChain, UINT64_MAX, presentCompleteSemaphores[currentFrame], VK_NULL_HANDLE, &imageIndex);
if (result == VK_ERROR_OUT_OF_DATE_KHR) {
windowResize();
return;
@ -1011,10 +1013,10 @@ public:
submitInfo.commandBufferCount = 1; // We submit a single command buffer
// Semaphore to wait upon before the submitted command buffer starts executing
submitInfo.pWaitSemaphores = &presentCompleteSemaphores[currentSemaphore];
submitInfo.pWaitSemaphores = &presentCompleteSemaphores[currentFrame];
submitInfo.waitSemaphoreCount = 1;
// Semaphore to be signaled when command buffers have completed
submitInfo.pSignalSemaphores = &renderCompleteSemaphores[currentSemaphore];
submitInfo.pSignalSemaphores = &renderCompleteSemaphores[imageIndex];
submitInfo.signalSemaphoreCount = 1;
// Submit to the graphics queue passing a wait fence
@ -1027,7 +1029,7 @@ public:
VkPresentInfoKHR presentInfo{};
presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
presentInfo.waitSemaphoreCount = 1;
presentInfo.pWaitSemaphores = &renderCompleteSemaphores[currentSemaphore];
presentInfo.pWaitSemaphores = &renderCompleteSemaphores[imageIndex];
presentInfo.swapchainCount = 1;
presentInfo.pSwapchains = &swapChain.swapChain;
presentInfo.pImageIndices = &imageIndex;
@ -1042,8 +1044,6 @@ public:
// Select the next frame to render to, based on the max. no. of concurrent frames
currentFrame = (currentFrame + 1) % MAX_CONCURRENT_FRAMES;
// Similar for the semaphores, which need to be unique to the swapchain images
currentSemaphore = (currentSemaphore + 1) % swapChain.imageCount;
}
};

34
examples/trianglevulkan13/trianglevulkan13.cpp
View file

@ -95,9 +95,8 @@ public:
VkCommandPool commandPool{ VK_NULL_HANDLE };
std::array<VkCommandBuffer, MAX_CONCURRENT_FRAMES> commandBuffers{};
// To select the correct sync and command objects, we need to keep track of the current frame and (swapchain) image index
// To select the correct sync and command objects, we need to keep track of the current frame
uint32_t currentFrame{ 0 };
uint32_t currentSemaphore{ 0 };
VkPhysicalDeviceVulkan13Features enabledFeatures{ VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_1_3_FEATURES };
@ -182,16 +181,19 @@ public:
fenceCI.flags = VK_FENCE_CREATE_SIGNALED_BIT;
VK_CHECK_RESULT(vkCreateFence(device, &fenceCI, nullptr, &waitFences[i]));
}
// Semaphores are per swapchain image
presentCompleteSemaphores.resize(swapChain.images.size());
renderCompleteSemaphores.resize(swapChain.images.size());
for (size_t i = 0; i < swapChain.images.size(); i++) {
// Semaphores are used for correct command ordering within a queue
// Semaphores are used for correct command ordering within a queue
// Used to ensure that image presentation is complete before starting to submit again
presentCompleteSemaphores.resize(MAX_CONCURRENT_FRAMES);
for (auto& semaphore : presentCompleteSemaphores) {
VkSemaphoreCreateInfo semaphoreCI{ VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO };
// Semaphore used to ensure that image presentation is complete before starting to submit again
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &presentCompleteSemaphores[i]));
// Semaphore used to ensure that all commands submitted have been finished before submitting the image to the queue
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &renderCompleteSemaphores[i]));
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &semaphore));
}
// Render completion
// Semaphore used to ensure that all commands submitted have been finished before submitting the image to the queue
renderCompleteSemaphores.resize(swapChain.images.size());
for (auto& semaphore : renderCompleteSemaphores) {
VkSemaphoreCreateInfo semaphoreCI{ VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO };
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCI, nullptr, &semaphore));
}
}
@ -701,7 +703,7 @@ public:
// Get the next swap chain image from the implementation
// Note that the implementation is free to return the images in any order, so we must use the acquire function and can't just cycle through the images/imageIndex on our own
uint32_t imageIndex{ 0 };
VkResult result = vkAcquireNextImageKHR(device, swapChain.swapChain, UINT64_MAX, presentCompleteSemaphores[currentSemaphore], VK_NULL_HANDLE, &imageIndex);
VkResult result = vkAcquireNextImageKHR(device, swapChain.swapChain, UINT64_MAX, presentCompleteSemaphores[currentFrame], VK_NULL_HANDLE, &imageIndex);
if (result == VK_ERROR_OUT_OF_DATE_KHR) {
windowResize();
return;
@ -788,10 +790,10 @@ public:
submitInfo.commandBufferCount = 1; // We submit a single command buffer
// Semaphore to wait upon before the submitted command buffer starts executing
submitInfo.pWaitSemaphores = &presentCompleteSemaphores[currentSemaphore];
submitInfo.pWaitSemaphores = &presentCompleteSemaphores[currentFrame];
submitInfo.waitSemaphoreCount = 1;
// Semaphore to be signaled when command buffers have completed
submitInfo.pSignalSemaphores = &renderCompleteSemaphores[currentSemaphore];
submitInfo.pSignalSemaphores = &renderCompleteSemaphores[imageIndex];
submitInfo.signalSemaphoreCount = 1;
// Submit to the graphics queue passing a wait fence
@ -802,7 +804,7 @@ public:
// This ensures that the image is not presented to the windowing system until all commands have been submitted
VkPresentInfoKHR presentInfo{ VK_STRUCTURE_TYPE_PRESENT_INFO_KHR };
presentInfo.waitSemaphoreCount = 1;
presentInfo.pWaitSemaphores = &renderCompleteSemaphores[currentSemaphore];
presentInfo.pWaitSemaphores = &renderCompleteSemaphores[imageIndex];
presentInfo.swapchainCount = 1;
presentInfo.pSwapchains = &swapChain.swapChain;
presentInfo.pImageIndices = &imageIndex;
@ -815,8 +817,6 @@ public:
// Select the next frame to render to, based on the max. no. of concurrent frames
currentFrame = (currentFrame + 1) % MAX_CONCURRENT_FRAMES;
// Similar for the semaphores, which need to be unique to the swapchain images
currentSemaphore = (currentSemaphore + 1) % swapChain.imageCount;
}
// Override these as otherwise the base class would generate frame buffers and render passes