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Only allow submitting swapchainImageCount images for host present at a time

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Prevents situations where nothing would otherwise be waiting on the GPU and since presentation no longer blocks too many images would be submitted for presentation.
This commit is contained in:
Billy Laws 2022-10-21 21:58:52 +01:00
parent bcd96ac77d
commit 14af383238
2 changed files with 11 additions and 4 deletions
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10
app/src/main/cpp/skyline/gpu/presentation_engine.cpp
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@ -121,8 +121,12 @@ namespace skyline::gpu {
throw exception("Setting the buffer transform to '{}' failed with {}", ToString(frame.transform), result);
windowTransform = frame.transform;
auto &acquireSemaphore{acquireSemaphores[acquireSemaphoreIndex]};
acquireSemaphoreIndex = (acquireSemaphoreIndex + 1) % swapchainImageCount;
auto &acquireSemaphore{acquireSemaphores[frameIndex]};
auto &frameFence{frameFences[frameIndex]};
if (frameFence)
frameFence->Wait();
frameIndex = (frameIndex + 1) % swapchainImageCount;
std::pair<vk::Result, u32> nextImage;
while (nextImage = vkSwapchain->acquireNextImage(std::numeric_limits<u64>::max(), *acquireSemaphore, {}), nextImage.first != vk::Result::eSuccess) [[unlikely]] {
@ -142,6 +146,8 @@ namespace skyline::gpu {
.layerCount = 1,
});
frameFence = nextImageTexture->cycle;
auto getMonotonicNsNow{[]() -> i64 {
timespec time;
if (clock_gettime(CLOCK_MONOTONIC, &time))

5
app/src/main/cpp/skyline/gpu/presentation_engine.h
View File

@ -41,8 +41,9 @@ namespace skyline::gpu {
static constexpr size_t MaxSwapchainImageCount{6}; //!< The maximum amount of swapchain textures, this affects the amount of images that can be in the swapchain
std::array<std::shared_ptr<Texture>, MaxSwapchainImageCount> images; //!< All the swapchain textures in the same order as supplied by the host swapchain
std::array<vk::raii::Semaphore, MaxSwapchainImageCount> presentSemaphores; //!< Array of semaphores used to signal that swapchain images are ready to be completed, indexed by Vulkan swapchain index
std::array<vk::raii::Semaphore, MaxSwapchainImageCount> acquireSemaphores; //!< Array of semaphores used to wait on the GPU for swapchain images to be acquired, indexed by `acquireSemaphoreIndex`
size_t acquireSemaphoreIndex{}; //!< The index of the next semaphore to be used for acquiring swapchain images
std::array<vk::raii::Semaphore, MaxSwapchainImageCount> acquireSemaphores; //!< Array of semaphores used to wait on the GPU for swapchain images to be acquired, indexed by `frameIndex`
std::array<std::shared_ptr<FenceCycle>, MaxSwapchainImageCount> frameFences{}; //!< Array of fences used to wait on the GPU for copying of swapchain images to be completed, indexed by `frameIndex`
size_t frameIndex{}; //!< The index of the next semaphore/fence to be used for acquiring swapchain images
size_t swapchainImageCount{}; //!< The number of images in the current swapchain
i64 frameTimestamp{}; //!< The timestamp of the last frame being shown in nanoseconds