tree b585306608f7291eb339c9a8b858c371ab85bda5
parent ab1bff4121d14b5633295f300d3d814a2eea3a2c
author Alexis Hetu <sugoi@google.com> 1635520163 -0400
committer swiftshader-scoped@luci-project-accounts.iam.gserviceaccount.com <swiftshader-scoped@luci-project-accounts.iam.gserviceaccount.com> 1644430463 +0000

VK_EXT_subgroup_size_control support

This CL is a minimal implementation of VK_EXT_subgroup_size_control.
According to the spec:
"Previously Vulkan exposed a single subgroup size per physical
 device, with the expectation that implementations will behave
 as if all subgroups have the same size"
By setting:
- VkPhysicalDeviceSubgroupSizeControlPropertiesEXT::minSubgroupSize
- VkPhysicalDeviceSubgroupSizeControlPropertiesEXT::maxSubgroupSize
the same value as:
- VkPhysicalDeviceSubgroupProperties::subgroupSize
we can support the feature without any other modifications.

maxComputeWorkgroupSubgroups is set to
MAX_COMPUTE_WORKGROUP_INVOCATIONS / minSubgroupSize
which is currently 256 / 4 = 64

Tests: dEQP-VK.subgroups.*_contro*
Bug: b/204502920
Change-Id: I3995a530465067871992ebc8ed3b0e7250386317
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/58828
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Commit-Queue: Alexis Hétu <sugoi@google.com>