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[dxbc] Add option to use subgroup ops for atomic counter operations

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This can greatly reduce the number of atomic operations when using
append/consume buffers.
This commit is contained in:
Philip Rebohle 2019-05-15 18:49:02 +02:00
parent 78ab26347d
commit d94d89c3ef
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2 changed files with 9 additions and 0 deletions
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5
src/dxbc/dxbc_options.cpp
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@ -14,11 +14,16 @@ namespace dxvk {
const DxvkDeviceFeatures& devFeatures = device->features();
const DxvkDeviceInfo& devInfo = adapter->devicePropertiesExt();
const VkShaderStageFlags allShaderStages = device->getShaderPipelineStages();
useDepthClipWorkaround
= !devFeatures.extDepthClipEnable.depthClipEnable;
useStorageImageReadWithoutFormat
= devFeatures.core.features.shaderStorageImageReadWithoutFormat;
useSubgroupOpsForAtomicCounters
= (devInfo.coreSubgroup.supportedStages & allShaderStages) == allShaderStages
&& (devInfo.coreSubgroup.supportedOperations & VK_SUBGROUP_FEATURE_BALLOT_BIT);
useSubgroupOpsForEarlyDiscard
= (devInfo.coreSubgroup.subgroupSize >= 4)
&& (devInfo.coreSubgroup.supportedStages & VK_SHADER_STAGE_FRAGMENT_BIT)

4
src/dxbc/dxbc_options.h
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@ -17,6 +17,10 @@ namespace dxvk {
/// Use the ShaderImageReadWithoutFormat capability.
bool useStorageImageReadWithoutFormat = false;
/// Use subgroup operations to reduce the number of
/// atomic operations for append/consume buffers.
bool useSubgroupOpsForAtomicCounters = false;
/// Use subgroup operations to discard fragment
/// shader invocations if derivatives remain valid.
bool useSubgroupOpsForEarlyDiscard = false;