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1 /*------------------------------------------------------------------------
2  * Vulkan Conformance Tests
3  * ------------------------
4  *
5  * Copyright (c) 2016 The Khronos Group Inc.
6  *
7  * Licensed under the Apache License, Version 2.0 (the "License");
8  * you may not use this file except in compliance with the License.
9  * You may obtain a copy of the License at
10  *
11  *      http://www.apache.org/licenses/LICENSE-2.0
12  *
13  * Unless required by applicable law or agreed to in writing, software
14  * distributed under the License is distributed on an "AS IS" BASIS,
15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16  * See the License for the specific language governing permissions and
17  * limitations under the License.
18  *
19  *//*!
20  * \file  vktSparseResourcesBufferMemoryAliasing.cpp
21  * \brief Sparse buffer memory aliasing tests
22  *//*--------------------------------------------------------------------*/
23 
24 #include "vktSparseResourcesBufferMemoryAliasing.hpp"
25 #include "vktSparseResourcesTestsUtil.hpp"
26 #include "vktSparseResourcesBase.hpp"
27 #include "vktTestCaseUtil.hpp"
28 
29 #include "vkDefs.hpp"
30 #include "vkRef.hpp"
31 #include "vkRefUtil.hpp"
32 #include "vkPlatform.hpp"
33 #include "vkPrograms.hpp"
34 #include "vkRefUtil.hpp"
35 #include "vkMemUtil.hpp"
36 #include "vkQueryUtil.hpp"
37 #include "vkBuilderUtil.hpp"
38 #include "vkTypeUtil.hpp"
39 
40 #include "deStringUtil.hpp"
41 #include "deUniquePtr.hpp"
42 
43 #include <string>
44 #include <vector>
45 
46 using namespace vk;
47 
48 namespace vkt
49 {
50 namespace sparse
51 {
52 namespace
53 {
54 
55 enum ShaderParameters
56 {
57 	SIZE_OF_UINT_IN_SHADER	= 4u,
58 	MODULO_DIVISOR			= 1024u
59 };
60 
computeWorkGroupSize(const deUint32 numInvocations)61 tcu::UVec3 computeWorkGroupSize (const deUint32 numInvocations)
62 {
63 	const deUint32		maxComputeWorkGroupInvocations	= 128u;
64 	const tcu::UVec3	maxComputeWorkGroupSize			= tcu::UVec3(128u, 128u, 64u);
65 	deUint32			numInvocationsLeft				= numInvocations;
66 
67 	const deUint32 xWorkGroupSize = std::min(std::min(numInvocationsLeft, maxComputeWorkGroupSize.x()), maxComputeWorkGroupInvocations);
68 	numInvocationsLeft = numInvocationsLeft / xWorkGroupSize + ((numInvocationsLeft % xWorkGroupSize) ? 1u : 0u);
69 
70 	const deUint32 yWorkGroupSize = std::min(std::min(numInvocationsLeft, maxComputeWorkGroupSize.y()), maxComputeWorkGroupInvocations / xWorkGroupSize);
71 	numInvocationsLeft = numInvocationsLeft / yWorkGroupSize + ((numInvocationsLeft % yWorkGroupSize) ? 1u : 0u);
72 
73 	const deUint32 zWorkGroupSize = std::min(std::min(numInvocationsLeft, maxComputeWorkGroupSize.z()), maxComputeWorkGroupInvocations / (xWorkGroupSize*yWorkGroupSize));
74 	numInvocationsLeft = numInvocationsLeft / zWorkGroupSize + ((numInvocationsLeft % zWorkGroupSize) ? 1u : 0u);
75 
76 	return tcu::UVec3(xWorkGroupSize, yWorkGroupSize, zWorkGroupSize);
77 }
78 
79 class BufferSparseMemoryAliasingCase : public TestCase
80 {
81 public:
82 					BufferSparseMemoryAliasingCase	(tcu::TestContext&		testCtx,
83 													 const std::string&		name,
84 													 const std::string&		description,
85 													 const deUint32			bufferSize,
86 													 const glu::GLSLVersion	glslVersion);
87 
88 	void			initPrograms					(SourceCollections&		sourceCollections) const;
89 	TestInstance*	createInstance					(Context&				context) const;
90 
91 private:
92 	const	deUint32			m_bufferSizeInBytes;
93 	const	glu::GLSLVersion	m_glslVersion;
94 };
95 
BufferSparseMemoryAliasingCase(tcu::TestContext & testCtx,const std::string & name,const std::string & description,const deUint32 bufferSize,const glu::GLSLVersion glslVersion)96 BufferSparseMemoryAliasingCase::BufferSparseMemoryAliasingCase (tcu::TestContext&		testCtx,
97 																const std::string&		name,
98 																const std::string&		description,
99 																const deUint32			bufferSize,
100 																const glu::GLSLVersion	glslVersion)
101 	: TestCase				(testCtx, name, description)
102 	, m_bufferSizeInBytes	(bufferSize)
103 	, m_glslVersion			(glslVersion)
104 {
105 }
106 
initPrograms(SourceCollections & sourceCollections) const107 void BufferSparseMemoryAliasingCase::initPrograms (SourceCollections& sourceCollections) const
108 {
109 	// Create compute program
110 	const char* const versionDecl		= glu::getGLSLVersionDeclaration(m_glslVersion);
111 	const deUint32	  numInvocations	= m_bufferSizeInBytes / SIZE_OF_UINT_IN_SHADER;
112 	const tcu::UVec3  workGroupSize		= computeWorkGroupSize(numInvocations);
113 
114 	std::ostringstream src;
115 	src << versionDecl << "\n"
116 		<< "layout (local_size_x = " << workGroupSize.x() << ", local_size_y = " << workGroupSize.y() << ", local_size_z = " << workGroupSize.z() << ") in;\n"
117 		<< "layout(set = 0, binding = 0, std430) writeonly buffer Output\n"
118 		<< "{\n"
119 		<< "	uint result[];\n"
120 		<< "} sb_out;\n"
121 		<< "\n"
122 		<< "void main (void)\n"
123 		<< "{\n"
124 		<< "	uint index = gl_GlobalInvocationID.x + (gl_GlobalInvocationID.y + gl_GlobalInvocationID.z*gl_NumWorkGroups.y*gl_WorkGroupSize.y)*gl_NumWorkGroups.x*gl_WorkGroupSize.x;\n"
125 		<< "	if ( index < " << m_bufferSizeInBytes / SIZE_OF_UINT_IN_SHADER << "u )\n"
126 		<< "	{\n"
127 		<< "		sb_out.result[index] = index % " << MODULO_DIVISOR << "u;\n"
128 		<< "	}\n"
129 		<< "}\n";
130 
131 	sourceCollections.glslSources.add("comp") << glu::ComputeSource(src.str());
132 }
133 
134 class BufferSparseMemoryAliasingInstance : public SparseResourcesBaseInstance
135 {
136 public:
137 					BufferSparseMemoryAliasingInstance	(Context&					context,
138 														 const deUint32				bufferSize);
139 
140 	tcu::TestStatus	iterate								(void);
141 
142 private:
143 	const deUint32			m_bufferSizeInBytes;
144 };
145 
BufferSparseMemoryAliasingInstance(Context & context,const deUint32 bufferSize)146 BufferSparseMemoryAliasingInstance::BufferSparseMemoryAliasingInstance (Context&					context,
147 																		const deUint32			bufferSize)
148 	: SparseResourcesBaseInstance	(context)
149 	, m_bufferSizeInBytes			(bufferSize)
150 {
151 }
152 
iterate(void)153 tcu::TestStatus BufferSparseMemoryAliasingInstance::iterate (void)
154 {
155 	const InstanceInterface&		instance		= m_context.getInstanceInterface();
156 	const VkPhysicalDevice			physicalDevice	= m_context.getPhysicalDevice();
157 
158 	if (!getPhysicalDeviceFeatures(instance, physicalDevice).sparseBinding)
159 		TCU_THROW(NotSupportedError, "Sparse binding not supported");
160 
161 	if (!getPhysicalDeviceFeatures(instance, physicalDevice).sparseResidencyAliased)
162 		TCU_THROW(NotSupportedError, "Sparse memory aliasing not supported");
163 
164 	{
165 		// Create logical device supporting both sparse and compute operations
166 		QueueRequirementsVec queueRequirements;
167 		queueRequirements.push_back(QueueRequirements(VK_QUEUE_SPARSE_BINDING_BIT, 1u));
168 		queueRequirements.push_back(QueueRequirements(VK_QUEUE_COMPUTE_BIT, 1u));
169 
170 		createDeviceSupportingQueues(queueRequirements);
171 	}
172 
173 	const DeviceInterface&	deviceInterface	= getDeviceInterface();
174 	const Queue&			sparseQueue		= getQueue(VK_QUEUE_SPARSE_BINDING_BIT, 0);
175 	const Queue&			computeQueue	= getQueue(VK_QUEUE_COMPUTE_BIT, 0);
176 
177 	VkBufferCreateInfo bufferCreateInfo =
178 	{
179 		VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,	// VkStructureType		sType;
180 		DE_NULL,								// const void*			pNext;
181 		VK_BUFFER_CREATE_SPARSE_BINDING_BIT |
182 		VK_BUFFER_CREATE_SPARSE_ALIASED_BIT,	// VkBufferCreateFlags	flags;
183 		m_bufferSizeInBytes,					// VkDeviceSize			size;
184 		VK_BUFFER_USAGE_STORAGE_BUFFER_BIT |
185 		VK_BUFFER_USAGE_TRANSFER_SRC_BIT,		// VkBufferUsageFlags	usage;
186 		VK_SHARING_MODE_EXCLUSIVE,				// VkSharingMode		sharingMode;
187 		0u,										// deUint32				queueFamilyIndexCount;
188 		DE_NULL									// const deUint32*		pQueueFamilyIndices;
189 	};
190 
191 	const deUint32 queueFamilyIndices[] = { sparseQueue.queueFamilyIndex, computeQueue.queueFamilyIndex };
192 
193 	if (sparseQueue.queueFamilyIndex != computeQueue.queueFamilyIndex)
194 	{
195 		bufferCreateInfo.sharingMode			= VK_SHARING_MODE_CONCURRENT;
196 		bufferCreateInfo.queueFamilyIndexCount	= 2u;
197 		bufferCreateInfo.pQueueFamilyIndices	= queueFamilyIndices;
198 	}
199 
200 	// Create sparse buffers
201 	const Unique<VkBuffer> sparseBufferWrite(createBuffer(deviceInterface, getDevice(), &bufferCreateInfo));
202 	const Unique<VkBuffer> sparseBufferRead	(createBuffer(deviceInterface, getDevice(), &bufferCreateInfo));
203 
204 	// Create sparse buffers memory bind semaphore
205 	const Unique<VkSemaphore> bufferMemoryBindSemaphore(makeSemaphore(deviceInterface, getDevice()));
206 
207 	const VkMemoryRequirements	bufferMemRequirements = getBufferMemoryRequirements(deviceInterface, getDevice(), *sparseBufferWrite);
208 
209 	if (bufferMemRequirements.size > getPhysicalDeviceProperties(instance, physicalDevice).limits.sparseAddressSpaceSize)
210 		TCU_THROW(NotSupportedError, "Required memory size for sparse resources exceeds device limits");
211 
212 	DE_ASSERT((bufferMemRequirements.size % bufferMemRequirements.alignment) == 0);
213 
214 	const deUint32 memoryType = findMatchingMemoryType(instance, physicalDevice, bufferMemRequirements, MemoryRequirement::Any);
215 
216 	if (memoryType == NO_MATCH_FOUND)
217 		return tcu::TestStatus::fail("No matching memory type found");
218 
219 	const VkSparseMemoryBind sparseMemoryBind = makeSparseMemoryBind(deviceInterface, getDevice(), bufferMemRequirements.size, memoryType, 0u);
220 
221 	Move<VkDeviceMemory> deviceMemoryPtr(check<VkDeviceMemory>(sparseMemoryBind.memory), Deleter<VkDeviceMemory>(deviceInterface, getDevice(), DE_NULL));
222 
223 	{
224 		const VkSparseBufferMemoryBindInfo sparseBufferMemoryBindInfo[2] =
225 		{
226 			makeSparseBufferMemoryBindInfo
227 			(*sparseBufferWrite,	//VkBuffer					buffer;
228 			1u,						//deUint32					bindCount;
229 			&sparseMemoryBind		//const VkSparseMemoryBind*	Binds;
230 			),
231 
232 			makeSparseBufferMemoryBindInfo
233 			(*sparseBufferRead,		//VkBuffer					buffer;
234 			1u,						//deUint32					bindCount;
235 			&sparseMemoryBind		//const VkSparseMemoryBind*	Binds;
236 			)
237 		};
238 
239 		const VkBindSparseInfo bindSparseInfo =
240 		{
241 			VK_STRUCTURE_TYPE_BIND_SPARSE_INFO,			//VkStructureType							sType;
242 			DE_NULL,									//const void*								pNext;
243 			0u,											//deUint32									waitSemaphoreCount;
244 			DE_NULL,									//const VkSemaphore*						pWaitSemaphores;
245 			2u,											//deUint32									bufferBindCount;
246 			sparseBufferMemoryBindInfo,					//const VkSparseBufferMemoryBindInfo*		pBufferBinds;
247 			0u,											//deUint32									imageOpaqueBindCount;
248 			DE_NULL,									//const VkSparseImageOpaqueMemoryBindInfo*	pImageOpaqueBinds;
249 			0u,											//deUint32									imageBindCount;
250 			DE_NULL,									//const VkSparseImageMemoryBindInfo*		pImageBinds;
251 			1u,											//deUint32									signalSemaphoreCount;
252 			&bufferMemoryBindSemaphore.get()			//const VkSemaphore*						pSignalSemaphores;
253 		};
254 
255 		// Submit sparse bind commands for execution
256 		VK_CHECK(deviceInterface.queueBindSparse(sparseQueue.queueHandle, 1u, &bindSparseInfo, DE_NULL));
257 	}
258 
259 	// Create output buffer
260 	const VkBufferCreateInfo		outputBufferCreateInfo	= makeBufferCreateInfo(m_bufferSizeInBytes, VK_BUFFER_USAGE_TRANSFER_DST_BIT);
261 	const Unique<VkBuffer>			outputBuffer			(createBuffer(deviceInterface, getDevice(), &outputBufferCreateInfo));
262 	const de::UniquePtr<Allocation>	outputBufferAlloc		(bindBuffer(deviceInterface, getDevice(), getAllocator(), *outputBuffer, MemoryRequirement::HostVisible));
263 
264 	// Create command buffer for compute and data transfer oparations
265 	const Unique<VkCommandPool>	  commandPool(makeCommandPool(deviceInterface, getDevice(), computeQueue.queueFamilyIndex));
266 	const Unique<VkCommandBuffer> commandBuffer(makeCommandBuffer(deviceInterface, getDevice(), *commandPool));
267 
268 	// Start recording commands
269 	beginCommandBuffer(deviceInterface, *commandBuffer);
270 
271 	// Create descriptor set
272 	const Unique<VkDescriptorSetLayout> descriptorSetLayout(
273 		DescriptorSetLayoutBuilder()
274 		.addSingleBinding(VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, VK_SHADER_STAGE_COMPUTE_BIT)
275 		.build(deviceInterface, getDevice()));
276 
277 	// Create compute pipeline
278 	const Unique<VkShaderModule>	shaderModule(createShaderModule(deviceInterface, getDevice(), m_context.getBinaryCollection().get("comp"), DE_NULL));
279 	const Unique<VkPipelineLayout>	pipelineLayout(makePipelineLayout(deviceInterface, getDevice(), *descriptorSetLayout));
280 	const Unique<VkPipeline>		computePipeline(makeComputePipeline(deviceInterface, getDevice(), *pipelineLayout, *shaderModule));
281 
282 	deviceInterface.cmdBindPipeline(*commandBuffer, VK_PIPELINE_BIND_POINT_COMPUTE, *computePipeline);
283 
284 	// Create descriptor set
285 	const Unique<VkDescriptorPool> descriptorPool(
286 		DescriptorPoolBuilder()
287 		.addType(VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1u)
288 		.build(deviceInterface, getDevice(), VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, 1u));
289 
290 	const Unique<VkDescriptorSet> descriptorSet(makeDescriptorSet(deviceInterface, getDevice(), *descriptorPool, *descriptorSetLayout));
291 
292 	{
293 		const VkDescriptorBufferInfo sparseBufferInfo = makeDescriptorBufferInfo(*sparseBufferWrite, 0u, m_bufferSizeInBytes);
294 
295 		DescriptorSetUpdateBuilder()
296 			.writeSingle(*descriptorSet, DescriptorSetUpdateBuilder::Location::binding(0u), VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, &sparseBufferInfo)
297 			.update(deviceInterface, getDevice());
298 	}
299 
300 	deviceInterface.cmdBindDescriptorSets(*commandBuffer, VK_PIPELINE_BIND_POINT_COMPUTE, *pipelineLayout, 0u, 1u, &descriptorSet.get(), 0u, DE_NULL);
301 
302 	{
303 		deUint32		 numInvocationsLeft = m_bufferSizeInBytes / SIZE_OF_UINT_IN_SHADER;
304 		const tcu::UVec3 workGroupSize = computeWorkGroupSize(numInvocationsLeft);
305 		const tcu::UVec3 maxComputeWorkGroupCount = tcu::UVec3(65535u, 65535u, 65535u);
306 
307 		numInvocationsLeft -= workGroupSize.x()*workGroupSize.y()*workGroupSize.z();
308 
309 		const deUint32	xWorkGroupCount = std::min(numInvocationsLeft, maxComputeWorkGroupCount.x());
310 		numInvocationsLeft = numInvocationsLeft / xWorkGroupCount + ((numInvocationsLeft % xWorkGroupCount) ? 1u : 0u);
311 		const deUint32	yWorkGroupCount = std::min(numInvocationsLeft, maxComputeWorkGroupCount.y());
312 		numInvocationsLeft = numInvocationsLeft / yWorkGroupCount + ((numInvocationsLeft % yWorkGroupCount) ? 1u : 0u);
313 		const deUint32	zWorkGroupCount = std::min(numInvocationsLeft, maxComputeWorkGroupCount.z());
314 		numInvocationsLeft = numInvocationsLeft / zWorkGroupCount + ((numInvocationsLeft % zWorkGroupCount) ? 1u : 0u);
315 
316 		if (numInvocationsLeft != 1u)
317 			TCU_THROW(NotSupportedError, "Buffer size is not supported");
318 
319 		deviceInterface.cmdDispatch(*commandBuffer, xWorkGroupCount, yWorkGroupCount, zWorkGroupCount);
320 	}
321 
322 	{
323 		const VkBufferMemoryBarrier sparseBufferWriteBarrier
324 			= makeBufferMemoryBarrier(	VK_ACCESS_SHADER_WRITE_BIT,
325 										VK_ACCESS_TRANSFER_READ_BIT,
326 										*sparseBufferWrite,
327 										0ull,
328 										m_bufferSizeInBytes);
329 
330 		deviceInterface.cmdPipelineBarrier(*commandBuffer, VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0u, 0u, DE_NULL, 1u, &sparseBufferWriteBarrier, 0u, DE_NULL);
331 	}
332 
333 	{
334 		const VkBufferCopy bufferCopy = makeBufferCopy(0u, 0u, m_bufferSizeInBytes);
335 
336 		deviceInterface.cmdCopyBuffer(*commandBuffer, *sparseBufferRead, *outputBuffer, 1u, &bufferCopy);
337 	}
338 
339 	{
340 		const VkBufferMemoryBarrier outputBufferHostBarrier
341 			= makeBufferMemoryBarrier(	VK_ACCESS_TRANSFER_WRITE_BIT,
342 										VK_ACCESS_HOST_READ_BIT,
343 										*outputBuffer,
344 										0ull,
345 										m_bufferSizeInBytes);
346 
347 		deviceInterface.cmdPipelineBarrier(*commandBuffer, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_HOST_BIT, 0u, 0u, DE_NULL, 1u, &outputBufferHostBarrier, 0u, DE_NULL);
348 	}
349 
350 	// End recording commands
351 	endCommandBuffer(deviceInterface, *commandBuffer);
352 
353 	// The stage at which execution is going to wait for finish of sparse binding operations
354 	const VkPipelineStageFlags waitStageBits[] = { VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT };
355 
356 	// Submit commands for execution and wait for completion
357 	submitCommandsAndWait(deviceInterface, getDevice(), computeQueue.queueHandle, *commandBuffer, 1u, &bufferMemoryBindSemaphore.get(), waitStageBits);
358 
359 	// Retrieve data from output buffer to host memory
360 	invalidateMappedMemoryRange(deviceInterface, getDevice(), outputBufferAlloc->getMemory(), outputBufferAlloc->getOffset(), m_bufferSizeInBytes);
361 
362 	const deUint8* outputData = static_cast<const deUint8*>(outputBufferAlloc->getHostPtr());
363 
364 	// Wait for sparse queue to become idle
365 	deviceInterface.queueWaitIdle(sparseQueue.queueHandle);
366 
367 	// Prepare reference data
368 	std::vector<deUint8> referenceData;
369 	referenceData.resize(m_bufferSizeInBytes);
370 
371 	std::vector<deUint32> referenceDataBlock;
372 	referenceDataBlock.resize(MODULO_DIVISOR);
373 
374 	for (deUint32 valueNdx = 0; valueNdx < MODULO_DIVISOR; ++valueNdx)
375 	{
376 		referenceDataBlock[valueNdx] = valueNdx % MODULO_DIVISOR;
377 	}
378 
379 	const deUint32 fullBlockSizeInBytes = MODULO_DIVISOR * SIZE_OF_UINT_IN_SHADER;
380 	const deUint32 lastBlockSizeInBytes = m_bufferSizeInBytes % fullBlockSizeInBytes;
381 	const deUint32 numberOfBlocks		= m_bufferSizeInBytes / fullBlockSizeInBytes + (lastBlockSizeInBytes ? 1u : 0u);
382 
383 	for (deUint32 blockNdx = 0; blockNdx < numberOfBlocks; ++blockNdx)
384 	{
385 		const deUint32 offset = blockNdx * fullBlockSizeInBytes;
386 		deMemcpy(&referenceData[0] + offset, &referenceDataBlock[0], ((offset + fullBlockSizeInBytes) <= m_bufferSizeInBytes) ? fullBlockSizeInBytes : lastBlockSizeInBytes);
387 	}
388 
389 	// Compare reference data with output data
390 	if (deMemCmp(&referenceData[0], outputData, m_bufferSizeInBytes) != 0)
391 		return tcu::TestStatus::fail("Failed");
392 	else
393 		return tcu::TestStatus::pass("Passed");
394 }
395 
createInstance(Context & context) const396 TestInstance* BufferSparseMemoryAliasingCase::createInstance (Context& context) const
397 {
398 	return new BufferSparseMemoryAliasingInstance(context, m_bufferSizeInBytes);
399 }
400 
401 } // anonymous ns
402 
addBufferSparseMemoryAliasingTests(tcu::TestCaseGroup * group)403 void addBufferSparseMemoryAliasingTests(tcu::TestCaseGroup* group)
404 {
405 	group->addChild(new BufferSparseMemoryAliasingCase(group->getTestContext(), "buffer_size_2_10", "", 1 << 10, glu::GLSL_VERSION_440));
406 	group->addChild(new BufferSparseMemoryAliasingCase(group->getTestContext(), "buffer_size_2_12", "", 1 << 12, glu::GLSL_VERSION_440));
407 	group->addChild(new BufferSparseMemoryAliasingCase(group->getTestContext(), "buffer_size_2_16", "", 1 << 16, glu::GLSL_VERSION_440));
408 	group->addChild(new BufferSparseMemoryAliasingCase(group->getTestContext(), "buffer_size_2_17", "", 1 << 17, glu::GLSL_VERSION_440));
409 	group->addChild(new BufferSparseMemoryAliasingCase(group->getTestContext(), "buffer_size_2_20", "", 1 << 20, glu::GLSL_VERSION_440));
410 	group->addChild(new BufferSparseMemoryAliasingCase(group->getTestContext(), "buffer_size_2_24", "", 1 << 24, glu::GLSL_VERSION_440));
411 }
412 
413 } // sparse
414 } // vkt
415