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Support tearing in VK swapchain #67

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Merged
peppy merged 1 commit into from
Jul 8, 2025
Merged

Support tearing in VK swapchain #67

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6 changes: 6 additions & 0 deletions src/Veldrid/Vk/VkGraphicsDevice.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,12 @@ internal unsafe class VkGraphicsDevice : GraphicsDevice

public override bool IsClipSpaceYInverted => !standardClipYDirection;

public override bool AllowTearing
{
get => mainSwapchain.AllowTearing;
set => mainSwapchain.AllowTearing = value;
}

public override Swapchain MainSwapchain => mainSwapchain;

public override GraphicsDeviceFeatures Features { get; }
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31 changes: 24 additions & 7 deletions src/Veldrid/Vk/VkSwapchain.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,22 @@ public override bool SyncToVerticalBlank
}
}

private bool allowTearing;

public bool AllowTearing
{
get => allowTearing;
set
{
if (allowTearing == value)
return;

allowTearing = value;

recreateAndReacquire(framebuffer.Width, framebuffer.Height);
}
}

private readonly VkGraphicsDevice gd;
private readonly VkSwapchainFramebuffer framebuffer;
private readonly uint presentQueueIndex;
Expand Down Expand Up @@ -203,14 +219,15 @@ private bool createSwapchain(uint width, uint height)

if (syncToVBlank)
{
if (presentModes.Contains(VkPresentModeKHR.FifoRelaxedKHR)) presentMode = VkPresentModeKHR.FifoRelaxedKHR;
}
else
{
if (presentModes.Contains(VkPresentModeKHR.MailboxKHR))
presentMode = VkPresentModeKHR.MailboxKHR;
else if (presentModes.Contains(VkPresentModeKHR.ImmediateKHR)) presentMode = VkPresentModeKHR.ImmediateKHR;
if (presentModes.Contains(VkPresentModeKHR.FifoRelaxedKHR))
presentMode = VkPresentModeKHR.FifoRelaxedKHR;
}
else if (allowTearing && presentModes.Contains(VkPresentModeKHR.ImmediateKHR))
presentMode = VkPresentModeKHR.ImmediateKHR;
else if (presentModes.Contains(VkPresentModeKHR.MailboxKHR))
presentMode = VkPresentModeKHR.MailboxKHR;
else if (presentModes.Contains(VkPresentModeKHR.ImmediateKHR))
presentMode = VkPresentModeKHR.ImmediateKHR;

uint maxImageCount = surfaceCapabilities.maxImageCount == 0 ? uint.MaxValue : surfaceCapabilities.maxImageCount;
uint imageCount = Math.Min(maxImageCount, surfaceCapabilities.minImageCount + 1);
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