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Compoiste alpha flag selection based on device support

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This commit is contained in:
saschawillems 2017-03-13 19:54:37 +01:00
parent de79a0d79a
commit 5443c01f07
1 changed files with 18 additions and 2 deletions
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18
base/VulkanSwapChain.hpp
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@ -379,6 +379,22 @@ public:
preTransform = surfCaps.currentTransform;
}
// Find a supported composite alpha format (not all devices support alpha opaque)
VkCompositeAlphaFlagBitsKHR compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
// Simply select the first composite alpha format available
std::vector<VkCompositeAlphaFlagBitsKHR> compositeAlphaFlags = {
VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR,
VK_COMPOSITE_ALPHA_PRE_MULTIPLIED_BIT_KHR,
VK_COMPOSITE_ALPHA_POST_MULTIPLIED_BIT_KHR,
VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR,
};
for (auto& compositeAlphaFlag : compositeAlphaFlags) {
if (surfCaps.supportedCompositeAlpha & compositeAlphaFlag) {
compositeAlpha = compositeAlphaFlag;
break;
};
}
VkSwapchainCreateInfoKHR swapchainCI = {};
swapchainCI.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
swapchainCI.pNext = NULL;
@ -397,7 +413,7 @@ public:
swapchainCI.oldSwapchain = oldSwapchain;
// Setting clipped to VK_TRUE allows the implementation to discard rendering outside of the surface area
swapchainCI.clipped = VK_TRUE;
swapchainCI.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
swapchainCI.compositeAlpha = compositeAlpha;
// Set additional usage flag for blitting from the swapchain images if supported
VkFormatProperties formatProps;