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Handle maxImageCount 0 in QVulkanWindow 

Take the logic we use in QRhi's Vulkan backend.

Pick-to: 6.0 5.15
Fixes: QTBUG-85791
Change-Id: Ifdc2b3d351af71fbc86e20abcede902303e41fc4
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
bb10
Laszlo Agocs 2021-01-04 14:38:35 +01:00
parent 133af89038
commit f6cb24f4c0
2 changed files with 6 additions and 4 deletions
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8
src/gui/vulkan/qvulkanwindow.cpp
View File

@ -1043,9 +1043,11 @@ void QVulkanWindowPrivate::recreateSwapChain()
VkPhysicalDevice physDev = physDevs.at(physDevIndex);
VkSurfaceCapabilitiesKHR surfaceCaps;
vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physDev, surface, &surfaceCaps);
uint32_t reqBufferCount = swapChainBufferCount;
if (surfaceCaps.maxImageCount)
reqBufferCount = qBound(surfaceCaps.minImageCount, reqBufferCount, surfaceCaps.maxImageCount);
uint32_t reqBufferCount;
if (surfaceCaps.maxImageCount == 0)
reqBufferCount = qMax<uint32_t>(2, surfaceCaps.minImageCount);
else
reqBufferCount = qMax(qMin<uint32_t>(surfaceCaps.maxImageCount, 3), surfaceCaps.minImageCount);
VkExtent2D bufferSize = surfaceCaps.currentExtent;
if (bufferSize.width == uint32_t(-1)) {

2
src/gui/vulkan/qvulkanwindow_p.h
View File

@ -132,7 +132,7 @@ public:
// rendering thread will get throttled to the presentation rate (vsync).
// This is in effect Example 5 from the VK_KHR_swapchain spec.
VkPresentModeKHR presentMode = VK_PRESENT_MODE_FIFO_KHR;
int swapChainBufferCount = 2;
int swapChainBufferCount = 0;
int frameLag = 2;
QSize swapChainImageSize;