src/Pipeline/ComputeProgram.cpp - SwiftShader - Git at Google

 // Copyright 2019 The SwiftShader Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //    http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "ComputeProgram.hpp"
 #include "Constants.hpp"

 #include "Vulkan/VkDebug.hpp"
 #include "Vulkan/VkPipelineLayout.hpp"

 #include "marl/defer.h"
 #include "marl/trace.h"
 #include "marl/waitgroup.h"

 #include <queue>

 namespace {

 enum
 {
 	X,
 	Y,
 	Z
 };

 }  // anonymous namespace

 namespace sw {

 ComputeProgram::ComputeProgram(SpirvShader const *shader, vk::PipelineLayout const *pipelineLayout, const vk::DescriptorSet::Bindings &descriptorSets)
     : shader(shader)
     , pipelineLayout(pipelineLayout)
     , descriptorSets(descriptorSets)
 {
 }

 ComputeProgram::~ComputeProgram()
 {
 }

 void ComputeProgram::generate()
 {
 	MARL_SCOPED_EVENT("ComputeProgram::generate");

 	SpirvRoutine routine(pipelineLayout);
 	shader->emitProlog(&routine);
 	emit(&routine);
 	shader->emitEpilog(&routine);
 }

 void ComputeProgram::setWorkgroupBuiltins(Pointer<Byte> data, SpirvRoutine *routine, Int workgroupID[3])
 {
 	routine->setInputBuiltin(shader, spv::BuiltInNumWorkgroups, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		auto numWorkgroups = *Pointer<Int4>(data + OFFSET(Data, numWorkgroups));
 		for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
 		{
 			value[builtin.FirstComponent + component] =
 			    As<SIMD::Float>(SIMD::Int(Extract(numWorkgroups, component)));
 		}
 	});

 	routine->setInputBuiltin(shader, spv::BuiltInWorkgroupId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
 		{
 			value[builtin.FirstComponent + component] =
 			    As<SIMD::Float>(SIMD::Int(workgroupID[component]));
 		}
 	});

 	routine->setInputBuiltin(shader, spv::BuiltInWorkgroupSize, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		auto workgroupSize = *Pointer<Int4>(data + OFFSET(Data, workgroupSize));
 		for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
 		{
 			value[builtin.FirstComponent + component] =
 			    As<SIMD::Float>(SIMD::Int(Extract(workgroupSize, component)));
 		}
 	});

 	routine->setInputBuiltin(shader, spv::BuiltInNumSubgroups, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		ASSERT(builtin.SizeInComponents == 1);
 		auto subgroupsPerWorkgroup = *Pointer<Int>(data + OFFSET(Data, subgroupsPerWorkgroup));
 		value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(subgroupsPerWorkgroup));
 	});

 	routine->setInputBuiltin(shader, spv::BuiltInSubgroupSize, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		ASSERT(builtin.SizeInComponents == 1);
 		auto invocationsPerSubgroup = *Pointer<Int>(data + OFFSET(Data, invocationsPerSubgroup));
 		value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(invocationsPerSubgroup));
 	});

 	routine->setImmutableInputBuiltins(shader);
 }

 void ComputeProgram::setSubgroupBuiltins(Pointer<Byte> data, SpirvRoutine *routine, Int workgroupID[3], SIMD::Int localInvocationIndex, Int subgroupIndex)
 {
 	Int4 numWorkgroups = *Pointer<Int4>(data + OFFSET(Data, numWorkgroups));
 	Int4 workgroupSize = *Pointer<Int4>(data + OFFSET(Data, workgroupSize));

 	// TODO: Fix Int4 swizzles so we can just use workgroupSize.x, workgroupSize.y.
 	Int workgroupSizeX = Extract(workgroupSize, X);
 	Int workgroupSizeY = Extract(workgroupSize, Y);

 	SIMD::Int localInvocationID[3];
 	{
 		SIMD::Int idx = localInvocationIndex;
 		localInvocationID[Z] = idx / SIMD::Int(workgroupSizeX * workgroupSizeY);
 		idx -= localInvocationID[Z] * SIMD::Int(workgroupSizeX * workgroupSizeY);  // modulo
 		localInvocationID[Y] = idx / SIMD::Int(workgroupSizeX);
 		idx -= localInvocationID[Y] * SIMD::Int(workgroupSizeX);  // modulo
 		localInvocationID[X] = idx;
 	}

 	routine->setInputBuiltin(shader, spv::BuiltInLocalInvocationIndex, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		ASSERT(builtin.SizeInComponents == 1);
 		value[builtin.FirstComponent] = As<SIMD::Float>(localInvocationIndex);
 	});

 	routine->setInputBuiltin(shader, spv::BuiltInSubgroupId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		ASSERT(builtin.SizeInComponents == 1);
 		value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(subgroupIndex));
 	});

 	routine->setInputBuiltin(shader, spv::BuiltInLocalInvocationId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
 		{
 			value[builtin.FirstComponent + component] =
 			    As<SIMD::Float>(localInvocationID[component]);
 		}
 	});

 	routine->setInputBuiltin(shader, spv::BuiltInGlobalInvocationId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
 		SIMD::Int wgID = 0;
 		wgID = Insert(wgID, workgroupID[X], X);
 		wgID = Insert(wgID, workgroupID[Y], Y);
 		wgID = Insert(wgID, workgroupID[Z], Z);
 		auto localBase = workgroupSize * wgID;
 		for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
 		{
 			auto globalInvocationID = SIMD::Int(Extract(localBase, component)) + localInvocationID[component];
 			value[builtin.FirstComponent + component] = As<SIMD::Float>(globalInvocationID);
 		}
 	});
 }

 void ComputeProgram::emit(SpirvRoutine *routine)
 {
 	Pointer<Byte> data = Arg<0>();
 	Int workgroupX = Arg<1>();
 	Int workgroupY = Arg<2>();
 	Int workgroupZ = Arg<3>();
 	Pointer<Byte> workgroupMemory = Arg<4>();
 	Int firstSubgroup = Arg<5>();
 	Int subgroupCount = Arg<6>();

 	routine->descriptorSets = data + OFFSET(Data, descriptorSets);
 	routine->descriptorDynamicOffsets = data + OFFSET(Data, descriptorDynamicOffsets);
 	routine->pushConstants = data + OFFSET(Data, pushConstants);
 	routine->constants = *Pointer<Pointer<Byte>>(data + OFFSET(Data, constants));
 	routine->workgroupMemory = workgroupMemory;

 	Int invocationsPerWorkgroup = *Pointer<Int>(data + OFFSET(Data, invocationsPerWorkgroup));

 	Int workgroupID[3] = { workgroupX, workgroupY, workgroupZ };
 	setWorkgroupBuiltins(data, routine, workgroupID);

 	For(Int i = 0, i < subgroupCount, i++)
 	{
 		auto subgroupIndex = firstSubgroup + i;

 		// TODO: Replace SIMD::Int(0, 1, 2, 3) with SIMD-width equivalent
 		auto localInvocationIndex = SIMD::Int(subgroupIndex * SIMD::Width) + SIMD::Int(0, 1, 2, 3);

 		// Disable lanes where (invocationIDs >= invocationsPerWorkgroup)
 		auto activeLaneMask = CmpLT(localInvocationIndex, SIMD::Int(invocationsPerWorkgroup));

 		setSubgroupBuiltins(data, routine, workgroupID, localInvocationIndex, subgroupIndex);

 		shader->emit(routine, activeLaneMask, activeLaneMask, descriptorSets);
 	}
 }

 void ComputeProgram::run(
     vk::DescriptorSet::Bindings const &descriptorSets,
     vk::DescriptorSet::DynamicOffsets const &descriptorDynamicOffsets,
     PushConstantStorage const &pushConstants,
     uint32_t baseGroupX, uint32_t baseGroupY, uint32_t baseGroupZ,
     uint32_t groupCountX, uint32_t groupCountY, uint32_t groupCountZ)
 {
 	auto &modes = shader->getModes();

 	auto invocationsPerSubgroup = SIMD::Width;
 	auto invocationsPerWorkgroup = modes.WorkgroupSizeX * modes.WorkgroupSizeY * modes.WorkgroupSizeZ;
 	auto subgroupsPerWorkgroup = (invocationsPerWorkgroup + invocationsPerSubgroup - 1) / invocationsPerSubgroup;

 	Data data;
 	data.descriptorSets = descriptorSets;
 	data.descriptorDynamicOffsets = descriptorDynamicOffsets;
 	data.numWorkgroups[X] = groupCountX;
 	data.numWorkgroups[Y] = groupCountY;
 	data.numWorkgroups[Z] = groupCountZ;
 	data.numWorkgroups[3] = 0;
 	data.workgroupSize[X] = modes.WorkgroupSizeX;
 	data.workgroupSize[Y] = modes.WorkgroupSizeY;
 	data.workgroupSize[Z] = modes.WorkgroupSizeZ;
 	data.workgroupSize[3] = 0;
 	data.invocationsPerSubgroup = invocationsPerSubgroup;
 	data.invocationsPerWorkgroup = invocationsPerWorkgroup;
 	data.subgroupsPerWorkgroup = subgroupsPerWorkgroup;
 	data.pushConstants = pushConstants;
 	data.constants = &sw::constants;

 	marl::WaitGroup wg;
 	const uint32_t batchCount = 16;

 	auto groupCount = groupCountX * groupCountY * groupCountZ;

 	for(uint32_t batchID = 0; batchID < batchCount && batchID < groupCount; batchID++)
 	{
 		wg.add(1);
 		marl::schedule([=, &data] {
 			defer(wg.done());
 			std::vector<uint8_t> workgroupMemory(shader->workgroupMemory.size());

 			for(uint32_t groupIndex = batchID; groupIndex < groupCount; groupIndex += batchCount)
 			{
 				auto modulo = groupIndex;
 				auto groupOffsetZ = modulo / (groupCountX * groupCountY);
 				modulo -= groupOffsetZ * (groupCountX * groupCountY);
 				auto groupOffsetY = modulo / groupCountX;
 				modulo -= groupOffsetY * groupCountX;
 				auto groupOffsetX = modulo;

 				auto groupZ = baseGroupZ + groupOffsetZ;
 				auto groupY = baseGroupY + groupOffsetY;
 				auto groupX = baseGroupX + groupOffsetX;
 				MARL_SCOPED_EVENT("groupX: %d, groupY: %d, groupZ: %d", groupX, groupY, groupZ);

 				using Coroutine = std::unique_ptr<rr::Stream<SpirvShader::YieldResult>>;
 				std::queue<Coroutine> coroutines;

 				if(modes.ContainsControlBarriers)
 				{
 					// Make a function call per subgroup so each subgroup
 					// can yield, bringing all subgroups to the barrier
 					// together.
 					for(int subgroupIndex = 0; subgroupIndex < subgroupsPerWorkgroup; subgroupIndex++)
 					{
 						auto coroutine = (*this)(&data, groupX, groupY, groupZ, workgroupMemory.data(), subgroupIndex, 1);
 						coroutines.push(std::move(coroutine));
 					}
 				}
 				else
 				{
 					auto coroutine = (*this)(&data, groupX, groupY, groupZ, workgroupMemory.data(), 0, subgroupsPerWorkgroup);
 					coroutines.push(std::move(coroutine));
 				}

 				while(coroutines.size() > 0)
 				{
 					auto coroutine = std::move(coroutines.front());
 					coroutines.pop();

 					SpirvShader::YieldResult result;
 					if(coroutine->await(result))
 					{
 						// TODO: Consider result (when the enum is more than 1 entry).
 						coroutines.push(std::move(coroutine));
 					}
 				}
 			}
 		});
 	}

 	wg.wait();
 }

 }  // namespace sw
	// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "ComputeProgram.hpp"
	#include "Constants.hpp"

	#include "Vulkan/VkDebug.hpp"
	#include "Vulkan/VkPipelineLayout.hpp"

	#include "marl/defer.h"
	#include "marl/trace.h"
	#include "marl/waitgroup.h"

	#include <queue>

	namespace {

	enum
	{
	X,
	Y,
	Z
	};

	} // anonymous namespace

	namespace sw {

	ComputeProgram::ComputeProgram(SpirvShader const shader, vk::PipelineLayout const pipelineLayout, const vk::DescriptorSet::Bindings &descriptorSets)
	: shader(shader)
	, pipelineLayout(pipelineLayout)
	, descriptorSets(descriptorSets)
	{
	}

	ComputeProgram::~ComputeProgram()
	{
	}

	void ComputeProgram::generate()
	{
	MARL_SCOPED_EVENT("ComputeProgram::generate");

	SpirvRoutine routine(pipelineLayout);
	shader->emitProlog(&routine);
	emit(&routine);
	shader->emitEpilog(&routine);
	}

	void ComputeProgram::setWorkgroupBuiltins(Pointer<Byte> data, SpirvRoutine *routine, Int workgroupID[3])
	{
	routine->setInputBuiltin(shader, spv::BuiltInNumWorkgroups, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	auto numWorkgroups = *Pointer<Int4>(data + OFFSET(Data, numWorkgroups));
	for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
	{
	value[builtin.FirstComponent + component] =
	As<SIMD::Float>(SIMD::Int(Extract(numWorkgroups, component)));
	}
	});

	routine->setInputBuiltin(shader, spv::BuiltInWorkgroupId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
	{
	value[builtin.FirstComponent + component] =
	As<SIMD::Float>(SIMD::Int(workgroupID[component]));
	}
	});

	routine->setInputBuiltin(shader, spv::BuiltInWorkgroupSize, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	auto workgroupSize = *Pointer<Int4>(data + OFFSET(Data, workgroupSize));
	for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
	{
	value[builtin.FirstComponent + component] =
	As<SIMD::Float>(SIMD::Int(Extract(workgroupSize, component)));
	}
	});

	routine->setInputBuiltin(shader, spv::BuiltInNumSubgroups, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	ASSERT(builtin.SizeInComponents == 1);
	auto subgroupsPerWorkgroup = *Pointer<Int>(data + OFFSET(Data, subgroupsPerWorkgroup));
	value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(subgroupsPerWorkgroup));
	});

	routine->setInputBuiltin(shader, spv::BuiltInSubgroupSize, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	ASSERT(builtin.SizeInComponents == 1);
	auto invocationsPerSubgroup = *Pointer<Int>(data + OFFSET(Data, invocationsPerSubgroup));
	value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(invocationsPerSubgroup));
	});

	routine->setImmutableInputBuiltins(shader);
	}

	void ComputeProgram::setSubgroupBuiltins(Pointer<Byte> data, SpirvRoutine *routine, Int workgroupID[3], SIMD::Int localInvocationIndex, Int subgroupIndex)
	{
	Int4 numWorkgroups = *Pointer<Int4>(data + OFFSET(Data, numWorkgroups));
	Int4 workgroupSize = *Pointer<Int4>(data + OFFSET(Data, workgroupSize));

	// TODO: Fix Int4 swizzles so we can just use workgroupSize.x, workgroupSize.y.
	Int workgroupSizeX = Extract(workgroupSize, X);
	Int workgroupSizeY = Extract(workgroupSize, Y);

	SIMD::Int localInvocationID[3];
	{
	SIMD::Int idx = localInvocationIndex;
	localInvocationID[Z] = idx / SIMD::Int(workgroupSizeX * workgroupSizeY);
	idx -= localInvocationID[Z] * SIMD::Int(workgroupSizeX * workgroupSizeY); // modulo
	localInvocationID[Y] = idx / SIMD::Int(workgroupSizeX);
	idx -= localInvocationID[Y] * SIMD::Int(workgroupSizeX); // modulo
	localInvocationID[X] = idx;
	}

	routine->setInputBuiltin(shader, spv::BuiltInLocalInvocationIndex, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	ASSERT(builtin.SizeInComponents == 1);
	value[builtin.FirstComponent] = As<SIMD::Float>(localInvocationIndex);
	});

	routine->setInputBuiltin(shader, spv::BuiltInSubgroupId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	ASSERT(builtin.SizeInComponents == 1);
	value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(subgroupIndex));
	});

	routine->setInputBuiltin(shader, spv::BuiltInLocalInvocationId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
	{
	value[builtin.FirstComponent + component] =
	As<SIMD::Float>(localInvocationID[component]);
	}
	});

	routine->setInputBuiltin(shader, spv::BuiltInGlobalInvocationId, [&](const SpirvShader::BuiltinMapping &builtin, Array<SIMD::Float> &value) {
	SIMD::Int wgID = 0;
	wgID = Insert(wgID, workgroupID[X], X);
	wgID = Insert(wgID, workgroupID[Y], Y);
	wgID = Insert(wgID, workgroupID[Z], Z);
	auto localBase = workgroupSize * wgID;
	for(uint32_t component = 0; component < builtin.SizeInComponents; component++)
	{
	auto globalInvocationID = SIMD::Int(Extract(localBase, component)) + localInvocationID[component];
	value[builtin.FirstComponent + component] = As<SIMD::Float>(globalInvocationID);
	}
	});
	}

	void ComputeProgram::emit(SpirvRoutine *routine)
	{
	Pointer<Byte> data = Arg<0>();
	Int workgroupX = Arg<1>();
	Int workgroupY = Arg<2>();
	Int workgroupZ = Arg<3>();
	Pointer<Byte> workgroupMemory = Arg<4>();
	Int firstSubgroup = Arg<5>();
	Int subgroupCount = Arg<6>();

	routine->descriptorSets = data + OFFSET(Data, descriptorSets);
	routine->descriptorDynamicOffsets = data + OFFSET(Data, descriptorDynamicOffsets);
	routine->pushConstants = data + OFFSET(Data, pushConstants);
	routine->constants = *Pointer<Pointer<Byte>>(data + OFFSET(Data, constants));
	routine->workgroupMemory = workgroupMemory;

	Int invocationsPerWorkgroup = *Pointer<Int>(data + OFFSET(Data, invocationsPerWorkgroup));

	Int workgroupID[3] = { workgroupX, workgroupY, workgroupZ };
	setWorkgroupBuiltins(data, routine, workgroupID);

	For(Int i = 0, i < subgroupCount, i++)
	{
	auto subgroupIndex = firstSubgroup + i;

	// TODO: Replace SIMD::Int(0, 1, 2, 3) with SIMD-width equivalent
	auto localInvocationIndex = SIMD::Int(subgroupIndex * SIMD::Width) + SIMD::Int(0, 1, 2, 3);

	// Disable lanes where (invocationIDs >= invocationsPerWorkgroup)
	auto activeLaneMask = CmpLT(localInvocationIndex, SIMD::Int(invocationsPerWorkgroup));

	setSubgroupBuiltins(data, routine, workgroupID, localInvocationIndex, subgroupIndex);

	shader->emit(routine, activeLaneMask, activeLaneMask, descriptorSets);
	}
	}

	void ComputeProgram::run(
	vk::DescriptorSet::Bindings const &descriptorSets,
	vk::DescriptorSet::DynamicOffsets const &descriptorDynamicOffsets,
	PushConstantStorage const &pushConstants,
	uint32_t baseGroupX, uint32_t baseGroupY, uint32_t baseGroupZ,
	uint32_t groupCountX, uint32_t groupCountY, uint32_t groupCountZ)
	{
	auto &modes = shader->getModes();

	auto invocationsPerSubgroup = SIMD::Width;
	auto invocationsPerWorkgroup = modes.WorkgroupSizeX * modes.WorkgroupSizeY * modes.WorkgroupSizeZ;
	auto subgroupsPerWorkgroup = (invocationsPerWorkgroup + invocationsPerSubgroup - 1) / invocationsPerSubgroup;

	Data data;
	data.descriptorSets = descriptorSets;
	data.descriptorDynamicOffsets = descriptorDynamicOffsets;
	data.numWorkgroups[X] = groupCountX;
	data.numWorkgroups[Y] = groupCountY;
	data.numWorkgroups[Z] = groupCountZ;
	data.numWorkgroups[3] = 0;
	data.workgroupSize[X] = modes.WorkgroupSizeX;
	data.workgroupSize[Y] = modes.WorkgroupSizeY;
	data.workgroupSize[Z] = modes.WorkgroupSizeZ;
	data.workgroupSize[3] = 0;
	data.invocationsPerSubgroup = invocationsPerSubgroup;
	data.invocationsPerWorkgroup = invocationsPerWorkgroup;
	data.subgroupsPerWorkgroup = subgroupsPerWorkgroup;
	data.pushConstants = pushConstants;
	data.constants = &sw::constants;

	marl::WaitGroup wg;
	const uint32_t batchCount = 16;

	auto groupCount = groupCountX * groupCountY * groupCountZ;

	for(uint32_t batchID = 0; batchID < batchCount && batchID < groupCount; batchID++)
	{
	wg.add(1);
	marl::schedule([=, &data] {
	defer(wg.done());
	std::vector<uint8_t> workgroupMemory(shader->workgroupMemory.size());

	for(uint32_t groupIndex = batchID; groupIndex < groupCount; groupIndex += batchCount)
	{
	auto modulo = groupIndex;
	auto groupOffsetZ = modulo / (groupCountX * groupCountY);
	modulo -= groupOffsetZ * (groupCountX * groupCountY);
	auto groupOffsetY = modulo / groupCountX;
	modulo -= groupOffsetY * groupCountX;
	auto groupOffsetX = modulo;

	auto groupZ = baseGroupZ + groupOffsetZ;
	auto groupY = baseGroupY + groupOffsetY;
	auto groupX = baseGroupX + groupOffsetX;
	MARL_SCOPED_EVENT("groupX: %d, groupY: %d, groupZ: %d", groupX, groupY, groupZ);

	using Coroutine = std::unique_ptr<rr::Stream<SpirvShader::YieldResult>>;
	std::queue<Coroutine> coroutines;

	if(modes.ContainsControlBarriers)
	{
	// Make a function call per subgroup so each subgroup
	// can yield, bringing all subgroups to the barrier
	// together.
	for(int subgroupIndex = 0; subgroupIndex < subgroupsPerWorkgroup; subgroupIndex++)
	{
	auto coroutine = (*this)(&data, groupX, groupY, groupZ, workgroupMemory.data(), subgroupIndex, 1);
	coroutines.push(std::move(coroutine));
	}
	}
	else
	{
	auto coroutine = (*this)(&data, groupX, groupY, groupZ, workgroupMemory.data(), 0, subgroupsPerWorkgroup);
	coroutines.push(std::move(coroutine));
	}

	while(coroutines.size() > 0)
	{
	auto coroutine = std::move(coroutines.front());
	coroutines.pop();

	SpirvShader::YieldResult result;
	if(coroutine->await(result))
	{
	// TODO: Consider result (when the enum is more than 1 entry).
	coroutines.push(std::move(coroutine));
	}
	}
	}
	});
	}

	wg.wait();
	}

	} // namespace sw