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Vulkan: Support subgroup reduction operations via GL_KHR_shader_subgroup

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This commit is contained in:
Stenzek
2019-03-22 20:39:37 +10:00
parent 86da282570
commit 6561850f2b
4 changed files with 56 additions and 1 deletions
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28
Source/Core/VideoBackends/Vulkan/VulkanContext.cpp
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@ -384,6 +384,7 @@ std::unique_ptr<VulkanContext> VulkanContext::Create(VkInstance instance, VkPhys
// Initialize DriverDetails so that we can check for bugs to disable features if needed.
context->InitDriverDetails();
context->PopulateShaderSubgroupSupport();
// Enable debug reports if the "Host GPU" log category is enabled.
if (enable_debug_reports)
@ -864,4 +865,31 @@ void VulkanContext::InitDriverDetails()
static_cast<double>(m_device_properties.driverVersion),
DriverDetails::Family::UNKNOWN);
}
void VulkanContext::PopulateShaderSubgroupSupport()
{
// If this function isn't available, we don't support Vulkan 1.1.
if (!vkGetPhysicalDeviceProperties2)
return;
VkPhysicalDeviceProperties2 device_properties_2 = {};
device_properties_2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2;
VkPhysicalDeviceSubgroupProperties subgroup_properties = {};
subgroup_properties.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBGROUP_PROPERTIES;
device_properties_2.pNext = &subgroup_properties;
vkGetPhysicalDeviceProperties2(m_physical_device, &device_properties_2);
m_shader_subgroup_size = subgroup_properties.subgroupSize;
// We require basic ops (for gl_SubgroupInvocationID), ballot (for subgroupBallot,
// subgroupBallotFindLSB), and arithmetic (for subgroupMin/subgroupMax).
constexpr VkSubgroupFeatureFlags required_operations = VK_SUBGROUP_FEATURE_BASIC_BIT |
VK_SUBGROUP_FEATURE_ARITHMETIC_BIT |
VK_SUBGROUP_FEATURE_BALLOT_BIT;
m_supports_shader_subgroup_operations =
(subgroup_properties.supportedOperations & required_operations) == required_operations &&
subgroup_properties.supportedStages & VK_SHADER_STAGE_FRAGMENT_BIT;
}
} // namespace Vulkan