int GraphicsSubsystem::initGraphicsSubsystem()
{
	char *myargv[1];
	int myargc = 1;
	myargv[0] = _strdup(COPYRIGHT);
	glutInit(&myargc, myargv);
	glutInitWindowPosition(WIN_POS_X, WIN_POS_Y);
	glutInitWindowSize(windowSize.x, windowSize.y);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH | GLUT_RGBA | GLUT_MULTISAMPLE);
	glutCreateWindow("Practical Work");

	glewExperimental = GL_TRUE;
	GLenum err = glewInit();
	if (GLEW_OK != err)	
	{
		printf("Errors occurred during glew init\n");
		return GSS_ERROR;
	}
	else if (!GLEW_VERSION_3_3)
	{
		GLint major = 0, minor = 0;
		glGetIntegerv(GL_MAJOR_VERSION, &major);
		glGetIntegerv(GL_MINOR_VERSION, &minor);
		printf("Application requires OpenGL 3.3; current version is %i.%i\n", major, minor);
		return GSS_ERROR;
	}

	bindingIndexes["matrices"] = 0;
	bindingIndexes["light"] = 1;
	bindingIndexes["material"] = 2;

	const char *textureUnits[] = { "ball", "cloth", "wood", "room", "roomBall" };
	loadTextureUnits(textureUnits, sizeof(textureUnits) / sizeof(char*));

	loadShaders();
	loadUniforms();
	loadBuffers();
	
	printf("Loading textures...\n");
	loadTexture(TEXTURE_PATH "ball_albedo.png", textures["ball"]);
	loadTexture(TEXTURE_PATH "cloth.png", textures["cloth"]);
	loadTexture(TEXTURE_PATH "wood.png", textures["wood"]);

#if loadSky == 1
	const char *skybox[] = { TEXTURE_PATH "skybox/negx.jpg", TEXTURE_PATH "skybox/posx.jpg",
		TEXTURE_PATH "skybox/negy.jpg", TEXTURE_PATH "skybox/posy.jpg",
		TEXTURE_PATH "skybox/negz.jpg", TEXTURE_PATH "skybox/posz.jpg" };
	const char *skyboxBall[] = { TEXTURE_PATH "skyboxBall/negx.jpg", TEXTURE_PATH "skyboxBall/posx.jpg",
		TEXTURE_PATH "skyboxBall/negy.jpg", TEXTURE_PATH "skyboxBall/posy.jpg",
		TEXTURE_PATH "skyboxBall/negz.jpg", TEXTURE_PATH "skyboxBall/posz.jpg" };
	loadCubemap(skybox, sizeof(skybox) / sizeof(char*), textures["room"]);
	loadCubemap(skyboxBall, sizeof(skyboxBall) / sizeof(char*), textures["roomBall"]);
#endif

	createDepthBuffer();
	createSampler();

	glEnable(GL_CULL_FACE);
	glCullFace(GL_BACK);

	glEnable(GL_MULTISAMPLE);
	glHint(GL_MULTISAMPLE_FILTER_HINT_NV, GL_NICEST);

	glEnable(GL_DEPTH_TEST);
	glDepthMask(GL_TRUE);
	glDepthFunc(GL_LEQUAL);
	glDepthRange(0.0f, 1.0f);
	glEnable(GL_DEPTH_CLAMP);
	
	return 0;
}
void SparseShaderIntrinsicsInstanceSampledBase::recordCommands (const VkCommandBuffer		commandBuffer,
																const VkImageCreateInfo&	imageSparseInfo,
																const VkImage				imageSparse,
																const VkImage				imageTexels,
																const VkImage				imageResidency)
{
	const InstanceInterface&		 instance			= m_context.getInstanceInterface();
	const DeviceInterface&			 deviceInterface	= getDeviceInterface();
	const VkPhysicalDevice			 physicalDevice		= m_context.getPhysicalDevice();
	const VkPhysicalDeviceProperties deviceProperties	= getPhysicalDeviceProperties(instance, physicalDevice);

	if (imageSparseInfo.extent.width  > deviceProperties.limits.maxFramebufferWidth  ||
		imageSparseInfo.extent.height > deviceProperties.limits.maxFramebufferHeight ||
		imageSparseInfo.arrayLayers   > deviceProperties.limits.maxFramebufferLayers)
	{
		TCU_THROW(NotSupportedError, "Image size exceeds allowed framebuffer dimensions");
	}

	// Check if device supports image format for sampled images
	if (!checkImageFormatFeatureSupport(instance, physicalDevice, imageSparseInfo.format, VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT))
		TCU_THROW(NotSupportedError, "Device does not support image format for sampled images");

	// Check if device supports image format for color attachment
	if (!checkImageFormatFeatureSupport(instance, physicalDevice, imageSparseInfo.format, VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT))
		TCU_THROW(NotSupportedError, "Device does not support image format for color attachment");

	// Make sure device supports VK_FORMAT_R32_UINT format for color attachment
	if (!checkImageFormatFeatureSupport(instance, physicalDevice, mapTextureFormat(m_residencyFormat), VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT))
		TCU_THROW(TestError, "Device does not support VK_FORMAT_R32_UINT format for color attachment");

	// Create buffer storing vertex data
	std::vector<tcu::Vec2> vertexData;

	vertexData.push_back(tcu::Vec2(-1.0f,-1.0f));
	vertexData.push_back(tcu::Vec2( 0.0f, 0.0f));

	vertexData.push_back(tcu::Vec2(-1.0f, 1.0f));
	vertexData.push_back(tcu::Vec2( 0.0f, 1.0f));

	vertexData.push_back(tcu::Vec2( 1.0f,-1.0f));
	vertexData.push_back(tcu::Vec2( 1.0f, 0.0f));

	vertexData.push_back(tcu::Vec2( 1.0f, 1.0f));
	vertexData.push_back(tcu::Vec2( 1.0f, 1.0f));

	const VkDeviceSize			vertexDataSizeInBytes	= sizeInBytes(vertexData);
	const VkBufferCreateInfo	vertexBufferCreateInfo	= makeBufferCreateInfo(vertexDataSizeInBytes, VK_BUFFER_USAGE_VERTEX_BUFFER_BIT);

	m_vertexBuffer		= createBuffer(deviceInterface, getDevice(), &vertexBufferCreateInfo);
	m_vertexBufferAlloc	= bindBuffer(deviceInterface, getDevice(), getAllocator(), *m_vertexBuffer, MemoryRequirement::HostVisible);

	deMemcpy(m_vertexBufferAlloc->getHostPtr(), &vertexData[0], static_cast<std::size_t>(vertexDataSizeInBytes));
	flushMappedMemoryRange(deviceInterface, getDevice(), m_vertexBufferAlloc->getMemory(), m_vertexBufferAlloc->getOffset(), vertexDataSizeInBytes);

	// Create render pass
	const VkAttachmentDescription texelsAttachmentDescription =
	{
		(VkAttachmentDescriptionFlags)0,					// VkAttachmentDescriptionFlags		flags;
		imageSparseInfo.format,								// VkFormat							format;
		VK_SAMPLE_COUNT_1_BIT,								// VkSampleCountFlagBits			samples;
		VK_ATTACHMENT_LOAD_OP_CLEAR,						// VkAttachmentLoadOp				loadOp;
		VK_ATTACHMENT_STORE_OP_STORE,						// VkAttachmentStoreOp				storeOp;
		VK_ATTACHMENT_LOAD_OP_DONT_CARE,					// VkAttachmentLoadOp				stencilLoadOp;
		VK_ATTACHMENT_STORE_OP_DONT_CARE,					// VkAttachmentStoreOp				stencilStoreOp;
		VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,			// VkImageLayout					initialLayout;
		VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL			// VkImageLayout					finalLayout;
	};

	const VkAttachmentDescription residencyAttachmentDescription =
	{
		(VkAttachmentDescriptionFlags)0,					// VkAttachmentDescriptionFlags		flags;
		mapTextureFormat(m_residencyFormat),				// VkFormat							format;
		VK_SAMPLE_COUNT_1_BIT,								// VkSampleCountFlagBits			samples;
		VK_ATTACHMENT_LOAD_OP_CLEAR,						// VkAttachmentLoadOp				loadOp;
		VK_ATTACHMENT_STORE_OP_STORE,						// VkAttachmentStoreOp				storeOp;
		VK_ATTACHMENT_LOAD_OP_DONT_CARE,					// VkAttachmentLoadOp				stencilLoadOp;
		VK_ATTACHMENT_STORE_OP_DONT_CARE,					// VkAttachmentStoreOp				stencilStoreOp;
		VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,			// VkImageLayout					initialLayout;
		VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL			// VkImageLayout					finalLayout;
	};

	const VkAttachmentDescription colorAttachmentsDescription[] = { texelsAttachmentDescription, residencyAttachmentDescription };

	const VkAttachmentReference texelsAttachmentReference =
	{
		0u,													// deUint32			attachment;
		VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL			// VkImageLayout	layout;
	};

	const VkAttachmentReference residencyAttachmentReference =
	{
		1u,													// deUint32			attachment;
		VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL			// VkImageLayout	layout;
	};

	const VkAttachmentReference colorAttachmentsReference[] = { texelsAttachmentReference, residencyAttachmentReference };

	const VkAttachmentReference depthAttachmentReference =
	{
		VK_ATTACHMENT_UNUSED,								// deUint32			attachment;
		VK_IMAGE_LAYOUT_UNDEFINED							// VkImageLayout	layout;
	};

	const VkSubpassDescription subpassDescription =
	{
		(VkSubpassDescriptionFlags)0,						// VkSubpassDescriptionFlags		flags;
		VK_PIPELINE_BIND_POINT_GRAPHICS,					// VkPipelineBindPoint				pipelineBindPoint;
		0u,													// deUint32							inputAttachmentCount;
		DE_NULL,											// const VkAttachmentReference*		pInputAttachments;
		2u,													// deUint32							colorAttachmentCount;
		colorAttachmentsReference,							// const VkAttachmentReference*		pColorAttachments;
		DE_NULL,											// const VkAttachmentReference*		pResolveAttachments;
		&depthAttachmentReference,							// const VkAttachmentReference*		pDepthStencilAttachment;
		0u,													// deUint32							preserveAttachmentCount;
		DE_NULL												// const deUint32*					pPreserveAttachments;
	};

	const VkRenderPassCreateInfo renderPassInfo =
	{
		VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,			// VkStructureType					sType;
		DE_NULL,											// const void*						pNext;
		(VkRenderPassCreateFlags)0,							// VkRenderPassCreateFlags			flags;
		2u,													// deUint32							attachmentCount;
		colorAttachmentsDescription,						// const VkAttachmentDescription*	pAttachments;
		1u,													// deUint32							subpassCount;
		&subpassDescription,								// const VkSubpassDescription*		pSubpasses;
		0u,													// deUint32							dependencyCount;
		DE_NULL												// const VkSubpassDependency*		pDependencies;
	};

	m_renderPass = createRenderPass(deviceInterface, getDevice(), &renderPassInfo);

	// Create descriptor set layout
	DescriptorSetLayoutBuilder descriptorLayerBuilder;

	descriptorLayerBuilder.addSingleBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT);

	const Unique<VkDescriptorSetLayout> descriptorSetLayout(descriptorLayerBuilder.build(deviceInterface, getDevice()));

	// Create descriptor pool
	DescriptorPoolBuilder descriptorPoolBuilder;

	descriptorPoolBuilder.addType(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, imageSparseInfo.mipLevels);

	descriptorPool = descriptorPoolBuilder.build(deviceInterface, getDevice(), VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, imageSparseInfo.mipLevels);

	// Create sampler object
	const tcu::Sampler			samplerObject(tcu::Sampler::REPEAT_GL, tcu::Sampler::REPEAT_GL, tcu::Sampler::REPEAT_GL, tcu::Sampler::NEAREST_MIPMAP_NEAREST, tcu::Sampler::NEAREST);
	const VkSamplerCreateInfo	samplerCreateInfo = mapSampler(samplerObject, m_format);
	m_sampler = createSampler(deviceInterface, getDevice(), &samplerCreateInfo);

	struct PushConstants
	{
		deUint32	lod;
		deUint32	padding;			// padding needed to satisfy std430 rules
		float		lodWidth;
		float		lodHeight;
	};

	// Create pipeline layout
	const VkPushConstantRange lodConstantRange =
	{
		VK_SHADER_STAGE_FRAGMENT_BIT,	// VkShaderStageFlags	stageFlags;
		0u,								// deUint32			offset;
		sizeof(PushConstants),			// deUint32			size;
	};

	const VkPipelineLayoutCreateInfo pipelineLayoutParams =
	{
		VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,		// VkStructureType					sType;
		DE_NULL,											// const void*						pNext;
		0u,													// VkPipelineLayoutCreateFlags		flags;
		1u,													// deUint32							setLayoutCount;
		&descriptorSetLayout.get(),							// const VkDescriptorSetLayout*		pSetLayouts;
		1u,													// deUint32							pushConstantRangeCount;
		&lodConstantRange,									// const VkPushConstantRange*		pPushConstantRanges;
	};

	const Unique<VkPipelineLayout> pipelineLayout(createPipelineLayout(deviceInterface, getDevice(), &pipelineLayoutParams));

	// Create graphics pipeline
	{
		Move<VkShaderModule> vertexModule	= createShaderModule(deviceInterface, getDevice(), m_context.getBinaryCollection().get("vertex_shader"), (VkShaderModuleCreateFlags)0);
		Move<VkShaderModule> fragmentModule	= createShaderModule(deviceInterface, getDevice(), m_context.getBinaryCollection().get("fragment_shader"), (VkShaderModuleCreateFlags)0);
		Move<VkShaderModule> geometryModule;

		if (imageSparseInfo.arrayLayers > 1u)
		{
			requireFeatures(instance, physicalDevice, FEATURE_GEOMETRY_SHADER);
			geometryModule = createShaderModule(deviceInterface, getDevice(), m_context.getBinaryCollection().get("geometry_shader"), (VkShaderModuleCreateFlags)0);
		}

		pipelines.push_back(makeVkSharedPtr(makeGraphicsPipeline(
			deviceInterface, getDevice(), *pipelineLayout, *m_renderPass, *vertexModule, *fragmentModule, *geometryModule)));
	}

	const VkPipeline graphicsPipeline = **pipelines[0];

	{
		const VkImageSubresourceRange fullImageSubresourceRange = makeImageSubresourceRange(VK_IMAGE_ASPECT_COLOR_BIT, 0u, imageSparseInfo.mipLevels, 0u, imageSparseInfo.arrayLayers);

		VkImageMemoryBarrier imageShaderAccessBarriers[3];

		imageShaderAccessBarriers[0] = makeImageMemoryBarrier
		(
			VK_ACCESS_TRANSFER_WRITE_BIT,
			VK_ACCESS_SHADER_READ_BIT,
			VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
			VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
			imageSparse,
			fullImageSubresourceRange
		);

		imageShaderAccessBarriers[1] = makeImageMemoryBarrier
		(
			0u,
			VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,
			VK_IMAGE_LAYOUT_UNDEFINED,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
			imageTexels,
			fullImageSubresourceRange
		);

		imageShaderAccessBarriers[2] = makeImageMemoryBarrier
		(
			0u,
			VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,
			VK_IMAGE_LAYOUT_UNDEFINED,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
			imageResidency,
			fullImageSubresourceRange
		);

		deviceInterface.cmdPipelineBarrier(commandBuffer, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, 0u, 0u, DE_NULL, 0u, DE_NULL, 3u, imageShaderAccessBarriers);
	}

	imageSparseViews.resize(imageSparseInfo.mipLevels);
	imageTexelsViews.resize(imageSparseInfo.mipLevels);
	imageResidencyViews.resize(imageSparseInfo.mipLevels);
	m_framebuffers.resize(imageSparseInfo.mipLevels);
	descriptorSets.resize(imageSparseInfo.mipLevels);

	std::vector<VkClearValue> clearValues;
	clearValues.push_back(makeClearValueColor(tcu::Vec4(0.0f, 0.0f, 0.0f, 1.0f)));
	clearValues.push_back(makeClearValueColor(tcu::Vec4(0.0f, 0.0f, 0.0f, 1.0f)));

	for (deUint32 mipLevelNdx = 0u; mipLevelNdx < imageSparseInfo.mipLevels; ++mipLevelNdx)
	{
		const vk::VkExtent3D			mipLevelSize	= mipLevelExtents(imageSparseInfo.extent, mipLevelNdx);
		const vk::VkRect2D				renderArea		= makeRect2D(mipLevelSize);
		const VkViewport				viewport		= makeViewport(mipLevelSize);
		const VkImageSubresourceRange	mipLevelRange	= makeImageSubresourceRange(VK_IMAGE_ASPECT_COLOR_BIT, mipLevelNdx, 1u, 0u, imageSparseInfo.arrayLayers);

		// Create color attachments image views
		imageTexelsViews[mipLevelNdx] = makeVkSharedPtr(makeImageView(deviceInterface, getDevice(), imageTexels, mapImageViewType(m_imageType), imageSparseInfo.format, mipLevelRange));
		imageResidencyViews[mipLevelNdx] = makeVkSharedPtr(makeImageView(deviceInterface, getDevice(), imageResidency, mapImageViewType(m_imageType), mapTextureFormat(m_residencyFormat), mipLevelRange));

		const VkImageView attachmentsViews[] = { **imageTexelsViews[mipLevelNdx], **imageResidencyViews[mipLevelNdx] };

		// Create framebuffer
		const VkFramebufferCreateInfo framebufferInfo =
		{
			VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,	// VkStructureType                             sType;
			DE_NULL,									// const void*                                 pNext;
			(VkFramebufferCreateFlags)0,				// VkFramebufferCreateFlags                    flags;
			*m_renderPass,								// VkRenderPass                                renderPass;
			2u,											// uint32_t                                    attachmentCount;
			attachmentsViews,							// const VkImageView*                          pAttachments;
			mipLevelSize.width,							// uint32_t                                    width;
			mipLevelSize.height,						// uint32_t                                    height;
			imageSparseInfo.arrayLayers,				// uint32_t                                    layers;
		};

		m_framebuffers[mipLevelNdx] = makeVkSharedPtr(createFramebuffer(deviceInterface, getDevice(), &framebufferInfo));

		// Create descriptor set
		descriptorSets[mipLevelNdx] = makeVkSharedPtr(makeDescriptorSet(deviceInterface, getDevice(), *descriptorPool, *descriptorSetLayout));
		const VkDescriptorSet descriptorSet = **descriptorSets[mipLevelNdx];

		// Update descriptor set
		const VkImageSubresourceRange sparseImageSubresourceRange = sampledImageRangeToBind(imageSparseInfo, mipLevelNdx);

		imageSparseViews[mipLevelNdx] = makeVkSharedPtr(makeImageView(deviceInterface, getDevice(), imageSparse, mapImageViewType(m_imageType), imageSparseInfo.format, sparseImageSubresourceRange));

		const VkDescriptorImageInfo imageSparseDescInfo = makeDescriptorImageInfo(*m_sampler, **imageSparseViews[mipLevelNdx], VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);

		DescriptorSetUpdateBuilder descriptorUpdateBuilder;

		descriptorUpdateBuilder.writeSingle(descriptorSet, DescriptorSetUpdateBuilder::Location::binding(BINDING_IMAGE_SPARSE), VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSparseDescInfo);
		descriptorUpdateBuilder.update(deviceInterface, getDevice());

		// Begin render pass
		beginRenderPass(deviceInterface, commandBuffer, *m_renderPass, **m_framebuffers[mipLevelNdx], renderArea, (deUint32)clearValues.size(), &clearValues[0]);

		// Bind graphics pipeline
		deviceInterface.cmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, graphicsPipeline);

		// Bind descriptor set
		deviceInterface.cmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, *pipelineLayout, 0u, 1u, &descriptorSet, 0u, DE_NULL);

		// Bind vertex buffer
		{
			const VkDeviceSize offset = 0ull;
			deviceInterface.cmdBindVertexBuffers(commandBuffer, 0u, 1u, &m_vertexBuffer.get(), &offset);
		}

		// Bind Viewport
		deviceInterface.cmdSetViewport(commandBuffer, 0u, 1u, &viewport);

		// Bind Scissor Rectangle
		deviceInterface.cmdSetScissor(commandBuffer, 0u, 1u, &renderArea);

		const PushConstants pushConstants =
		{
			mipLevelNdx,
			0u,											// padding
			static_cast<float>(mipLevelSize.width),
			static_cast<float>(mipLevelSize.height)
		};

		// Update push constants
		deviceInterface.cmdPushConstants(commandBuffer, *pipelineLayout, VK_SHADER_STAGE_FRAGMENT_BIT, 0u, sizeof(PushConstants), &pushConstants);

		// Draw full screen quad
		deviceInterface.cmdDraw(commandBuffer, 4u, 1u, 0u, 0u);

		// End render pass
		endRenderPass(deviceInterface, commandBuffer);
	}

	{
		const VkImageSubresourceRange fullImageSubresourceRange = makeImageSubresourceRange(VK_IMAGE_ASPECT_COLOR_BIT, 0u, imageSparseInfo.mipLevels, 0u, imageSparseInfo.arrayLayers);

		VkImageMemoryBarrier imageOutputTransferSrcBarriers[2];

		imageOutputTransferSrcBarriers[0] = makeImageMemoryBarrier
		(
			VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,
			VK_ACCESS_TRANSFER_READ_BIT,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
			VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
			imageTexels,
			fullImageSubresourceRange
		);

		imageOutputTransferSrcBarriers[1] = makeImageMemoryBarrier
		(
			VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,
			VK_ACCESS_TRANSFER_READ_BIT,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
			VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
			imageResidency,
			fullImageSubresourceRange
		);

		deviceInterface.cmdPipelineBarrier(commandBuffer, VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0u, 0u, DE_NULL, 0u, DE_NULL, 2u, imageOutputTransferSrcBarriers);
	}
}