Commit ec308b35557ee7776f2a5a604bca388da3caaf73
2023-05-15T15:03:10
Vulkan: Add feature to limit sample count to 2 This CL adds a feature called `limitSampleCountTo2`. Using it will have the Vulkan backend limit max samples to 2. Why 2? That's the minimum required in Vulkan to multisample without error. Here's an example validation error: vkCmdResolveImage: srcImage sample count is VK_SAMPLE_COUNT_1_BIT. The Vulkan spec states: srcImage must have a sample count equal to any valid sample count value other than VK_SAMPLE_COUNT_1_BIT. https://www.khronos.org/registry/vulkan/specs/1.3-extensions/html/vkspec.html#VUID-vkCmdResolveImage-srcImage-00257 Using a limit as opposed to forcing a value allows non-multisampling (sample count of 1) to continue working. To see how tests fare when the feature is set, see the following test results that force the value on: https://chromium-review.googlesource.com/c/angle/angle/+/4534098/4 Test: adb shell setprop debug.angle.feature_overrides_enabled limitSampleCountTo2 Bug: b/279498079 Bug: angleproject:8162 Change-Id: I1df2822709151e6084c32055b5aff444e0b10db5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4518562 Commit-Queue: Cody Northrop <cnorthrop@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Greg Schlomoff <gregschlom@google.com> Reviewed-by: Charlie Lao <cclao@google.com>