Acquire texture: Option<std::time::Duration> timeouts
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cwfitzgerald
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cwfitzgerald
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Gordon-F
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ah, oops I also missed removing the the |
A std::time::Duration allows for timeouts to be specified more clearly in Rust using whatever units are convenient for the caller, and an Option also makes it clearer in case no timeout is wanted, as opposed to passing a bitwise !0 as special timeout value. Notably there was an impedance mismatch with the Vulkan backend that takes a 64bit timeout in nanoseconds and uses u64::MAX to indicate no timeout and the backend was not mapping a given u32::MAX into a u64::MAX
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Prior to Android 11 then Android's vkAcquireNextImageKHR implementation was non-conformant and didn't support timeouts and additionally would log a verbose warning if a timeout was requested. For reference this version of AcquireNextImageKHR doesn't support timeouts: https://android.googlesource.com/platform/frameworks/native/+/refs/tags/android-mainline-10.0.0_r13/vulkan/libvulkan/swapchain.cpp#1426 and this version does: https://android.googlesource.com/platform/frameworks/native/+/refs/tags/android-mainline-11.0.0_r45/vulkan/libvulkan/swapchain.cpp#1438 (i.e. timeout support was added in Android 11) This patch adds a dependency on the `android-properties` crate that provides a simple wrapper for the `__system_property_set` syscall so that the platform version can be read via the `ro.build.version.sdk` property and then for versions < 30 (corresponds to Android 11) any timeout given to `acquire_texture` will be ignored (and `u64::MAX` will be passed to Vulkan)
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btw just pushed a last second tweak to include the value of the property in the log message in case of parse failure, as suggested |
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Description
The Vulkan backend wasn't correctly interpreting the u32 timeout value for Surface
acquire_textureconsidering the special meaning foru32::MAXthat should mean 'no timeout'.The Vulkan
vkAcquireNextImageKHRAPI takes a 64bit timeout in nanoseconds andu32::MAXtimeout in milliseconds should have been converted to au64::MAX.Prior to Android 11 then Android's
vkAcquireNextImageKHRimplementation is also non-conformant and doesn't support timeouts (and will also output verbose log messages if timeouts are given).To make the intent clearer, this updates the
acquire_textureAPI to take astd::time::Durationthat allows the caller to use whatever units are convenient. Additionally the duration is wrapped in anOptionso it's clearer to see when no timeout is wanted without needing to reserve a special value to indicate this.On Android < 11 then any given timeout is now ignored (as with the egl / web / metal backends) and
u64::MAXis always passed tovkAcquireNextImageKHRFor reference this version of AcquireNextImageKHR doesn't support timeouts: https://android.googlesource.com/platform/frameworks/native/+/refs/tags/android-mainline-10.0.0_r13/vulkan/libvulkan/swapchain.cpp#1426 and this version does: https://android.googlesource.com/platform/frameworks/native/+/refs/tags/android-mainline-11.0.0_r45/vulkan/libvulkan/swapchain.cpp#1438 (i.e. timeout support was added in Android 11)
Testing
I have tested this via an egui Android application I have been working on recently, and this can also be tested with this minimal winit + wgpu Android application: https://github.com/rib/agdk-rust/tree/main/examples/na-winit-wgpu and these same patches based on the 0.12 branch of wgpu: https://github.com/rib/wgpu/tree/acquire_texture_duration_timeouts_v0.12