Sub pass G-Buffer compositing example (wip)

data/shaders/subpasses/composition.frag

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+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (input_attachment_index = 1, binding = 0) uniform subpassInput samplerposition;
+layout (input_attachment_index = 2, binding = 1) uniform subpassInput samplerNormal;
+layout (input_attachment_index = 3, binding = 2) uniform subpassInput samplerAlbedo;
+
+layout (location = 0) in vec2 inUV;
+
+layout (location = 0) out vec4 outFragcolor;
+layout (location = 1) out vec4 outPosition;
+layout (location = 2) out vec4 outNormal;
+layout (location = 3) out vec4 outAlbedo;
+
+layout (constant_id = 0) const int NUM_LIGHTS = 32;
+
+struct Light {
+	vec4 position;
+	vec3 color;
+	float radius;
+};
+
+layout (binding = 3) uniform UBO 
+{
+	vec4 viewPos;
+	Light lights[NUM_LIGHTS];
+} ubo;
+
+
+void main() 
+{
+	// Read G-Buffer values from previous sub pass
+	vec3 fragPos = subpassLoad(samplerposition).rgb;
+	vec3 normal = subpassLoad(samplerNormal).rgb;
+	vec4 albedo = subpassLoad(samplerAlbedo);
+	
+	#define ambient 0.15
+	
+	// Ambient part
+	vec3 fragcolor  = albedo.rgb * ambient;
+	
+	for(int i = 0; i < NUM_LIGHTS; ++i)
+	{
+		// Vector to light
+		vec3 L = ubo.lights[i].position.xyz - fragPos;
+		// Distance from light to fragment position
+		float dist = length(L);
+
+		// Viewer to fragment
+		vec3 V = ubo.viewPos.xyz - fragPos;
+		V = normalize(V);
+		
+		// Light to fragment
+		L = normalize(L);
+
+		// Attenuation
+		float atten = ubo.lights[i].radius / (pow(dist, 2.0) + 1.0);
+
+		// Diffuse part
+		vec3 N = normalize(normal);
+		float NdotL = max(0.0, dot(N, L));
+		vec3 diff = ubo.lights[i].color * albedo.rgb * NdotL * atten;
+
+		// Specular part
+		// Specular map values are stored in alpha of albedo mrt
+		vec3 R = reflect(-L, N);
+		float NdotR = max(0.0, dot(R, V));
+		vec3 spec = ubo.lights[i].color * albedo.a * pow(NdotR, 32.0) * atten;
+
+		fragcolor += diff + spec;	
+	}    	
+   
+	outFragcolor = vec4(fragcolor, 1.0);
+
+	// Write G-Buffer attachments to avoid undefined behaviour (validation error)
+	outPosition = vec4(0.0);
+	outNormal = vec4(0.0);
+	outAlbedo = vec4(0.0);
+}

data/shaders/subpasses/composition.vert

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+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) out vec2 outUV;
+
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
+void main() 
+{
+	outUV = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
+	gl_Position = vec4(outUV * 2.0f - 1.0f, 0.0f, 1.0f);
+}

data/shaders/subpasses/gbuffer.frag

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+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (binding = 1) uniform sampler2D samplerColor;
+layout (binding = 2) uniform sampler2D samplerNormalMap;
+
+layout (location = 0) in vec3 inNormal;
+layout (location = 1) in vec3 inColor;
+layout (location = 2) in vec3 inWorldPos;
+
+layout (location = 0) out vec4 outColor;
+layout (location = 1) out vec4 outPosition;
+layout (location = 2) out vec4 outNormal;
+layout (location = 3) out vec4 outAlbedo;
+
+void main() 
+{
+	outPosition = vec4(inWorldPos, 1.0);
+
+	vec3 N = normalize(inNormal);
+	N.y = -N.y;
+	outNormal = vec4(N, 1.0);
+
+	outAlbedo = vec4(inColor, 1.0);
+
+	// Write color attachments to avoid undefined behaviour (validation error)
+	outColor = vec4(0.0);
+}

data/shaders/subpasses/gbuffer.vert

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+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec4 inPos;
+layout (location = 1) in vec3 inColor;
+layout (location = 2) in vec3 inNormal;
+
+layout (binding = 0) uniform UBO 
+{
+	mat4 projection;
+	mat4 model;
+	mat4 view;
+} ubo;
+
+layout (location = 0) out vec3 outNormal;
+layout (location = 1) out vec3 outColor;
+layout (location = 2) out vec3 outWorldPos;
+layout (location = 3) out vec3 outTangent;
+
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
+void main() 
+{
+	gl_Position = ubo.projection * ubo.view * ubo.model * inPos;
+	
+	// Vertex position in world space
+	outWorldPos = vec3(ubo.model * inPos);
+	// GL to Vulkan coord space
+	outWorldPos.y = -outWorldPos.y;
+	
+	// Normal in world space
+	mat3 mNormal = transpose(inverse(mat3(ubo.model)));
+	outNormal = mNormal * normalize(inNormal);	
+	
+	// Currently just vertex color
+	outColor = inColor;
+}

subpasses/subpasses.cpp

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+/*
+* Vulkan Example - Using subpasses for G-Buffer compositing
+*
+* Copyright (C) 2016 by Sascha Willems - www.saschawillems.de
+*
+* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <vector>
+#include <random>
+
+#define GLM_FORCE_RADIANS
+#define GLM_FORCE_DEPTH_ZERO_TO_ONE
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include <vulkan/vulkan.h>
+#include "vulkanexamplebase.h"
+
+#define VERTEX_BUFFER_BIND_ID 0
+#define ENABLE_VALIDATION false
+
+#define NUM_LIGHTS 32
+
+// Vertex layout for this example
+std::vector<vkMeshLoader::VertexLayout> vertexLayout =
+{
+	vkMeshLoader::VERTEX_LAYOUT_POSITION,
+	vkMeshLoader::VERTEX_LAYOUT_COLOR,
+	vkMeshLoader::VERTEX_LAYOUT_NORMAL,
+};
+
+class VulkanExample : public VulkanExampleBase
+{
+public:
+	struct {
+		vkMeshLoader::MeshBuffer scene;
+	} meshes;
+
+	struct {
+		VkPipelineVertexInputStateCreateInfo inputState;
+		std::vector<VkVertexInputBindingDescription> bindingDescriptions;
+		std::vector<VkVertexInputAttributeDescription> attributeDescriptions;
+	} vertices;
+
+	struct {
+		glm::mat4 projection;
+		glm::mat4 model;
+		glm::mat4 view;
+	} uboVS, uboOffscreenVS;
+
+	struct Light {
+		glm::vec4 position;
+		glm::vec3 color;
+		float radius;
+	};
+
+	struct {
+		glm::vec4 viewPos;
+		Light lights[NUM_LIGHTS];
+	} uboFragmentLights;
+
+	struct {
+		vkTools::UniformData vsOffscreen;
+		vkTools::UniformData fsLights;
+	} uniformData;
+
+	struct {
+		VkPipeline offscreen;
+	} pipelines;
+
+	struct {
+		VkPipelineLayout offscreen;
+	} pipelineLayouts;
+
+	struct {
+		VkDescriptorSet scene;
+	} descriptorSets;
+
+	VkDescriptorSetLayout descriptorSetLayout;
+
+	// todo
+	struct {
+		VkPipelineLayout pipelineLayout;
+		VkPipeline pipeline;
+		VkDescriptorSetLayout descriptorSetLayout;
+		VkDescriptorSet descriptorSet;
+	} composition;
+
+	// Framebuffer for offscreen rendering
+	struct FrameBufferAttachment {
+		VkImage image;
+		VkDeviceMemory mem;
+		VkImageView view;
+		VkFormat format;
+	};
+	struct Attachments {
+		FrameBufferAttachment position, normal, albedo;
+	} attachments;
+	
+	VulkanExample() : VulkanExampleBase(ENABLE_VALIDATION)
+	{
+		enableTextOverlay = false;
+		title = "Vulkan Example - Subpasses";
+		camera.type = Camera::CameraType::firstperson;
+		camera.movementSpeed = 5.0f;
+#ifndef __ANDROID__
+		camera.rotationSpeed = 0.25f;
+#endif
+		camera.position = { 9.5f, 4.5f, -5.8f };
+		camera.setRotation(glm::vec3(-9.5f, 53.25f, 0.0f));
+		camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 256.0f);
+	}
+
+	~VulkanExample()
+	{
+		// Clean up used Vulkan resources 
+		// Note : Inherited destructor cleans up resources stored in base class
+
+		// Frame buffer
+
+		// Color attachments
+		vkDestroyImageView(device, attachments.position.view, nullptr);
+		vkDestroyImage(device, attachments.position.image, nullptr);
+		vkFreeMemory(device, attachments.position.mem, nullptr);
+
+		vkDestroyImageView(device, attachments.normal.view, nullptr);
+		vkDestroyImage(device, attachments.normal.image, nullptr);
+		vkFreeMemory(device, attachments.normal.mem, nullptr);
+
+		vkDestroyImageView(device, attachments.albedo.view, nullptr);
+		vkDestroyImage(device, attachments.albedo.image, nullptr);
+		vkFreeMemory(device, attachments.albedo.mem, nullptr);
+
+		vkDestroyPipeline(device, pipelines.offscreen, nullptr);
+
+		vkDestroyPipelineLayout(device, pipelineLayouts.offscreen, nullptr);
+
+		vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
+
+		// Meshes
+		vkMeshLoader::freeMeshBufferResources(device, &meshes.scene);
+
+		// Uniform buffers
+		vkTools::destroyUniformData(device, &uniformData.vsOffscreen);
+		vkTools::destroyUniformData(device, &uniformData.fsLights);
+	}
+
+	// Create a frame buffer attachment
+	void createAttachment(VkFormat format, VkImageUsageFlags usage, FrameBufferAttachment *attachment)
+	{
+		VkImageAspectFlags aspectMask = 0;
+		VkImageLayout imageLayout;
+
+		attachment->format = format;
+
+		if (usage & VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT)
+		{
+			aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+			imageLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
+		}
+		if (usage & VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT)
+		{
+			aspectMask = VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT;
+			imageLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
+		}
+
+		assert(aspectMask > 0);
+
+		VkImageCreateInfo image = vkTools::initializers::imageCreateInfo();
+		image.imageType = VK_IMAGE_TYPE_2D;
+		image.format = format;
+		image.extent.width = width;
+		image.extent.height = height;
+		image.extent.depth = 1;
+		image.mipLevels = 1;
+		image.arrayLayers = 1;
+		image.samples = VK_SAMPLE_COUNT_1_BIT;
+		image.tiling = VK_IMAGE_TILING_OPTIMAL;
+		image.usage = usage | VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT;	// VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT flag is required for input attachments;
+		image.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+
+		VkMemoryAllocateInfo memAlloc = vkTools::initializers::memoryAllocateInfo();
+		VkMemoryRequirements memReqs;
+
+		VK_CHECK_RESULT(vkCreateImage(device, &image, nullptr, &attachment->image));
+		vkGetImageMemoryRequirements(device, attachment->image, &memReqs);
+		memAlloc.allocationSize = memReqs.size;
+		memAlloc.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
+		VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &attachment->mem));
+		VK_CHECK_RESULT(vkBindImageMemory(device, attachment->image, attachment->mem, 0));
+
+		VkImageViewCreateInfo imageView = vkTools::initializers::imageViewCreateInfo();
+		imageView.viewType = VK_IMAGE_VIEW_TYPE_2D;
+		imageView.format = format;
+		imageView.subresourceRange = {};
+		imageView.subresourceRange.aspectMask = aspectMask;
+		imageView.subresourceRange.baseMipLevel = 0;
+		imageView.subresourceRange.levelCount = 1;
+		imageView.subresourceRange.baseArrayLayer = 0;
+		imageView.subresourceRange.layerCount = 1;
+		imageView.image = attachment->image;
+		VK_CHECK_RESULT(vkCreateImageView(device, &imageView, nullptr, &attachment->view));
+	}
+
+	// Create color attachments for the G-Buffer components
+	void createGBufferAttachments()
+	{
+		createAttachment(VK_FORMAT_R16G16B16A16_SFLOAT, VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT, &attachments.position);	// (World space) Positions		
+		createAttachment(VK_FORMAT_R16G16B16A16_SFLOAT, VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT, &attachments.normal);		// (World space) Normals		
+		createAttachment(VK_FORMAT_R8G8B8A8_UNORM, VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT, &attachments.albedo);			// Albedo (color)
+	}
+
+	// Override framebuffer setup from base class
+	// Deferred components will be used as frame buffer attachments
+	void setupFrameBuffer()
+	{
+		VkImageView attachments[5];
+
+		VkFramebufferCreateInfo frameBufferCreateInfo = {};
+		frameBufferCreateInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
+		frameBufferCreateInfo.pNext = NULL;
+		frameBufferCreateInfo.renderPass = renderPass;
+		frameBufferCreateInfo.attachmentCount = 5;
+		frameBufferCreateInfo.pAttachments = attachments;
+		frameBufferCreateInfo.width = width;
+		frameBufferCreateInfo.height = height;
+		frameBufferCreateInfo.layers = 1;
+
+		// Create frame buffers for every swap chain image
+		frameBuffers.resize(swapChain.imageCount);
+		for (uint32_t i = 0; i < frameBuffers.size(); i++)
+		{
+			attachments[0] = swapChain.buffers[i].view;
+			attachments[1] = this->attachments.position.view;
+			attachments[2] = this->attachments.normal.view;
+			attachments[3] = this->attachments.albedo.view;
+			attachments[4] = depthStencil.view;
+			VK_CHECK_RESULT(vkCreateFramebuffer(device, &frameBufferCreateInfo, nullptr, &frameBuffers[i]));
+		}
+	}
+
+	// Override render pass setup from base class
+	void setupRenderPass()
+	{
+		createGBufferAttachments(); 
+
+		std::array<VkAttachmentDescription, 5> attachments{};
+		// Color attachment
+		attachments[0].format = colorformat;
+		attachments[0].samples = VK_SAMPLE_COUNT_1_BIT;
+		attachments[0].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
+		attachments[0].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
+		attachments[0].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
+		attachments[0].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
+		attachments[0].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+		attachments[0].finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
+
+		// Deferred attachments
+		// Position
+		attachments[1].format = this->attachments.position.format;
+		attachments[1].samples = VK_SAMPLE_COUNT_1_BIT;
+		attachments[1].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
+		attachments[1].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
+		attachments[1].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
+		attachments[1].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
+		attachments[1].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+		attachments[1].finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
+		// Normals
+		attachments[2].format = this->attachments.normal.format;
+		attachments[2].samples = VK_SAMPLE_COUNT_1_BIT;
+		attachments[2].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
+		attachments[2].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
+		attachments[2].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
+		attachments[2].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
+		attachments[2].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+		attachments[2].finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
+		// Albedo
+		attachments[3].format = this->attachments.albedo.format;
+		attachments[3].samples = VK_SAMPLE_COUNT_1_BIT;
+		attachments[3].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
+		attachments[3].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
+		attachments[3].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
+		attachments[3].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
+		attachments[3].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+		attachments[3].finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
+		// Depth attachment
+		attachments[4].format = depthFormat;
+		attachments[4].samples = VK_SAMPLE_COUNT_1_BIT;
+		attachments[4].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
+		attachments[4].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
+		attachments[4].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
+		attachments[4].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
+		attachments[4].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+		attachments[4].finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
+
+		std::array<VkSubpassDescription,2> subpassDescriptions{};
+
+		// First subpass: Fill G-Buffer components
+
+		VkAttachmentReference colorReferences[4];
+		colorReferences[0] = { 0, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
+		colorReferences[1] = { 1, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
+		colorReferences[2] = { 2, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
+		colorReferences[3] = { 3, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
+		VkAttachmentReference depthReference = { 4, VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL };
+
+		subpassDescriptions[0].pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
+		subpassDescriptions[0].colorAttachmentCount = 4;
+		subpassDescriptions[0].pColorAttachments = colorReferences;
+		subpassDescriptions[0].pDepthStencilAttachment = &depthReference;
+
+		// Second subpass: Final composition (using G-Buffer components)
+
+		VkAttachmentReference colorReference = { 0, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
+
+		VkAttachmentReference inputReferences[3];
+		inputReferences[0] = { 1, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL };
+		inputReferences[1] = { 2, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL };
+		inputReferences[2] = { 3, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL };
+
+		subpassDescriptions[1].pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
+		subpassDescriptions[1].colorAttachmentCount = 1;
+		subpassDescriptions[1].pColorAttachments = &colorReference;
+		subpassDescriptions[1].pDepthStencilAttachment = &depthReference;
+		subpassDescriptions[1].inputAttachmentCount = 3;
+		subpassDescriptions[1].pInputAttachments = inputReferences;
+
+		// Subpass dependencies for layout transitions
+		std::array<VkSubpassDependency, 3> dependencies;
+
+		dependencies[0].srcSubpass = VK_SUBPASS_EXTERNAL;
+		dependencies[0].dstSubpass = 0;
+		dependencies[0].srcStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
+		dependencies[0].dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
+		dependencies[0].srcAccessMask = VK_ACCESS_MEMORY_READ_BIT;
+		dependencies[0].dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
+		dependencies[0].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
+
+		// This dependency transitions the input attachment from color attachment to shader read
+		dependencies[1].srcSubpass = 0;
+		dependencies[1].dstSubpass = 1;
+		dependencies[1].srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
+		dependencies[1].dstStageMask = VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT;
+		dependencies[1].srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
+		dependencies[1].dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
+		dependencies[1].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
+
+		dependencies[2].srcSubpass = 0;
+		dependencies[2].dstSubpass = VK_SUBPASS_EXTERNAL;
+		dependencies[2].srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
+		dependencies[2].dstStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
+		dependencies[2].srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
+		dependencies[2].dstAccessMask = VK_ACCESS_MEMORY_READ_BIT;
+		dependencies[2].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
+
+		VkRenderPassCreateInfo renderPassInfo = {};
+		renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
+		renderPassInfo.attachmentCount = static_cast<uint32_t>(attachments.size());
+		renderPassInfo.pAttachments = attachments.data();
+		renderPassInfo.subpassCount = static_cast<uint32_t>(subpassDescriptions.size());
+		renderPassInfo.pSubpasses = subpassDescriptions.data();
+		renderPassInfo.dependencyCount = static_cast<uint32_t>(dependencies.size());
+		renderPassInfo.pDependencies = dependencies.data();
+
+		VK_CHECK_RESULT(vkCreateRenderPass(device, &renderPassInfo, nullptr, &renderPass));
+	}
+
+	void buildCommandBuffers()
+	{
+		VkCommandBufferBeginInfo cmdBufInfo = vkTools::initializers::commandBufferBeginInfo();
+
+		VkClearValue clearValues[5];
+		clearValues[0].color = { { 0.0f, 0.0f, 0.0f, 0.0f } };
+		clearValues[1].color = { { 0.0f, 0.0f, 0.0f, 0.0f } };
+		clearValues[2].color = { { 0.0f, 0.0f, 0.0f, 0.0f } };
+		clearValues[3].color = { { 0.0f, 0.0f, 0.0f, 0.0f } };
+		clearValues[4].depthStencil = { 1.0f, 0 };
+
+		VkRenderPassBeginInfo renderPassBeginInfo = vkTools::initializers::renderPassBeginInfo();
+		renderPassBeginInfo.renderPass = renderPass;
+		renderPassBeginInfo.renderArea.offset.x = 0;
+		renderPassBeginInfo.renderArea.offset.y = 0;
+		renderPassBeginInfo.renderArea.extent.width = width;
+		renderPassBeginInfo.renderArea.extent.height = height;
+		renderPassBeginInfo.clearValueCount = 5;
+		renderPassBeginInfo.pClearValues = clearValues;
+
+		for (int32_t i = 0; i < drawCmdBuffers.size(); ++i)
+		{
+			// Set target frame buffer
+			renderPassBeginInfo.framebuffer = frameBuffers[i];
+
+			VK_CHECK_RESULT(vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo));
+
+			// First sub pass
+			// Renders the components of the scene to the G-Buffer atttachments
+
+			vkCmdBeginRenderPass(drawCmdBuffers[i], &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
+
+			VkViewport viewport = vkTools::initializers::viewport((float)width, (float)height, 0.0f, 1.0f);
+			vkCmdSetViewport(drawCmdBuffers[i], 0, 1, &viewport);
+
+			VkRect2D scissor = vkTools::initializers::rect2D(width, height, 0, 0);
+			vkCmdSetScissor(drawCmdBuffers[i], 0, 1, &scissor);
+
+			VkDeviceSize offsets[1] = { 0 };
+
+			vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.offscreen);
+
+			vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.offscreen, 0, 1, &descriptorSets.scene, 0, NULL);
+			vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &meshes.scene.vertices.buf, offsets);
+			vkCmdBindIndexBuffer(drawCmdBuffers[i], meshes.scene.indices.buf, 0, VK_INDEX_TYPE_UINT32);
+			vkCmdDrawIndexed(drawCmdBuffers[i], meshes.scene.indexCount, 1, 0, 0, 0);
+
+			// Second sub pass
+			// This subpass will use the G-Buffer components that have been filled in the first subpass as input attachment for the final compositing
+
+			vkCmdNextSubpass(drawCmdBuffers[i], VK_SUBPASS_CONTENTS_INLINE);
+
+			vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, composition.pipeline);
+			vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, composition.pipelineLayout, 0, 1, &composition.descriptorSet, 0, NULL);
+			vkCmdDraw(drawCmdBuffers[i], 3, 1, 0, 0);
+
+			vkCmdEndRenderPass(drawCmdBuffers[i]);
+
+			VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
+		}
+	}
+
+	void loadAssets()
+	{
+		loadMesh(getAssetPath() + "models/samplescene.dae", &meshes.scene, vertexLayout, 0.25f);
+	}
+
+	void setupVertexDescriptions()
+	{
+		// Binding description
+		vertices.bindingDescriptions.resize(1);
+		vertices.bindingDescriptions[0] =
+			vkTools::initializers::vertexInputBindingDescription(
+				VERTEX_BUFFER_BIND_ID,
+				vkMeshLoader::vertexSize(vertexLayout),
+				VK_VERTEX_INPUT_RATE_VERTEX);
+
+		// Attribute descriptions
+		vertices.attributeDescriptions.resize(3);
+		// Location 0: Position
+		vertices.attributeDescriptions[0] =
+			vkTools::initializers::vertexInputAttributeDescription(
+				VERTEX_BUFFER_BIND_ID,
+				0,
+				VK_FORMAT_R32G32B32_SFLOAT,
+				0);
+		// Location 1: Color
+		vertices.attributeDescriptions[1] =
+			vkTools::initializers::vertexInputAttributeDescription(
+				VERTEX_BUFFER_BIND_ID,
+				1,
+				VK_FORMAT_R32G32B32_SFLOAT,
+				sizeof(float) * 3);
+		// Location 2: Normal
+		vertices.attributeDescriptions[2] =
+			vkTools::initializers::vertexInputAttributeDescription(
+				VERTEX_BUFFER_BIND_ID,
+				2,
+				VK_FORMAT_R32G32B32_SFLOAT,
+				sizeof(float) * 6);
+
+		vertices.inputState = vkTools::initializers::pipelineVertexInputStateCreateInfo();
+		vertices.inputState.vertexBindingDescriptionCount = static_cast<uint32_t>(vertices.bindingDescriptions.size());
+		vertices.inputState.pVertexBindingDescriptions = vertices.bindingDescriptions.data();
+		vertices.inputState.vertexAttributeDescriptionCount = static_cast<uint32_t>(vertices.attributeDescriptions.size());
+		vertices.inputState.pVertexAttributeDescriptions = vertices.attributeDescriptions.data();
+	}
+
+	void setupDescriptorPool()
+	{
+		std::vector<VkDescriptorPoolSize> poolSizes =
+		{
+			vkTools::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 8),
+			vkTools::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 9),
+			vkTools::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, 3),
+		};
+
+		VkDescriptorPoolCreateInfo descriptorPoolInfo =
+			vkTools::initializers::descriptorPoolCreateInfo(
+				static_cast<uint32_t>(poolSizes.size()),
+				poolSizes.data(),
+				4);
+
+		VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
+	}
+
+	void setupDescriptorSetLayout()
+	{
+		// Deferred shading layout
+		std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings =
+		{
+			// Binding 0 : Vertex shader uniform buffer
+			vkTools::initializers::descriptorSetLayoutBinding(
+				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+				VK_SHADER_STAGE_VERTEX_BIT,
+				0)
+		};
+
+		VkDescriptorSetLayoutCreateInfo descriptorLayout =
+			vkTools::initializers::descriptorSetLayoutCreateInfo(
+				setLayoutBindings.data(),
+				static_cast<uint32_t>(setLayoutBindings.size()));
+
+		VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayout));
+
+		VkPipelineLayoutCreateInfo pPipelineLayoutCreateInfo =
+			vkTools::initializers::pipelineLayoutCreateInfo(
+				&descriptorSetLayout,
+				1);
+
+		// Offscreen (scene) rendering pipeline layout
+		VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pPipelineLayoutCreateInfo, nullptr, &pipelineLayouts.offscreen));
+	}
+
+	void setupDescriptorSet()
+	{
+		std::vector<VkWriteDescriptorSet> writeDescriptorSets;
+
+		VkDescriptorSetAllocateInfo allocInfo =
+			vkTools::initializers::descriptorSetAllocateInfo(
+				descriptorPool,
+				&descriptorSetLayout,
+				1);
+
+		// Background
+		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.scene));
+		writeDescriptorSets =
+		{
+			// Binding 0: Vertex shader uniform buffer
+			vkTools::initializers::writeDescriptorSet(
+				descriptorSets.scene,
+				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+				0,
+				&uniformData.vsOffscreen.descriptor)
+		};
+		vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, NULL);
+	}
+
+	void preparePipelines()
+	{
+		VkPipelineInputAssemblyStateCreateInfo inputAssemblyState =
+			vkTools::initializers::pipelineInputAssemblyStateCreateInfo(
+				VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST,
+				0,
+				VK_FALSE);
+
+		VkPipelineRasterizationStateCreateInfo rasterizationState =
+			vkTools::initializers::pipelineRasterizationStateCreateInfo(
+				VK_POLYGON_MODE_FILL,
+				VK_CULL_MODE_BACK_BIT,
+				VK_FRONT_FACE_CLOCKWISE,
+				0);
+
+		VkPipelineColorBlendAttachmentState blendAttachmentState =
+			vkTools::initializers::pipelineColorBlendAttachmentState(
+				0xf,
+				VK_FALSE);
+
+		VkPipelineColorBlendStateCreateInfo colorBlendState =
+			vkTools::initializers::pipelineColorBlendStateCreateInfo(
+				1,
+				&blendAttachmentState);
+
+		VkPipelineDepthStencilStateCreateInfo depthStencilState =
+			vkTools::initializers::pipelineDepthStencilStateCreateInfo(
+				VK_TRUE, 
+				VK_TRUE,
+				VK_COMPARE_OP_LESS_OR_EQUAL);
+
+		VkPipelineViewportStateCreateInfo viewportState =
+			vkTools::initializers::pipelineViewportStateCreateInfo(1, 1, 0);
+
+		VkPipelineMultisampleStateCreateInfo multisampleState =
+			vkTools::initializers::pipelineMultisampleStateCreateInfo(
+				VK_SAMPLE_COUNT_1_BIT,
+				0);
+
+		std::vector<VkDynamicState> dynamicStateEnables = {
+			VK_DYNAMIC_STATE_VIEWPORT,
+			VK_DYNAMIC_STATE_SCISSOR
+		};
+		VkPipelineDynamicStateCreateInfo dynamicState =
+			vkTools::initializers::pipelineDynamicStateCreateInfo(
+				dynamicStateEnables.data(),
+				static_cast<uint32_t>(dynamicStateEnables.size()),
+				0);
+
+		// Final fullscreen pass pipeline
+		std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages;
+
+		VkGraphicsPipelineCreateInfo pipelineCreateInfo =
+			vkTools::initializers::pipelineCreateInfo(
+				pipelineLayouts.offscreen,
+				renderPass,
+				0);
+
+		pipelineCreateInfo.pVertexInputState = &vertices.inputState;
+		pipelineCreateInfo.pInputAssemblyState = &inputAssemblyState;
+		pipelineCreateInfo.pRasterizationState = &rasterizationState;
+		pipelineCreateInfo.pColorBlendState = &colorBlendState;
+		pipelineCreateInfo.pMultisampleState = &multisampleState;
+		pipelineCreateInfo.pViewportState = &viewportState;
+		pipelineCreateInfo.pDepthStencilState = &depthStencilState;
+		pipelineCreateInfo.pDynamicState = &dynamicState;
+		pipelineCreateInfo.stageCount = static_cast<uint32_t>(shaderStages.size());
+		pipelineCreateInfo.pStages = shaderStages.data();
+
+		std::array<VkPipelineColorBlendAttachmentState, 4> blendAttachmentStates = {
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE),
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE),
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE),
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE)
+		};
+
+		colorBlendState.attachmentCount = static_cast<uint32_t>(blendAttachmentStates.size());
+		colorBlendState.pAttachments = blendAttachmentStates.data();
+
+		// Offscreen pipeline
+		shaderStages[0] = loadShader(getAssetPath() + "shaders/subpasses/gbuffer.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
+		shaderStages[1] = loadShader(getAssetPath() + "shaders/subpasses/gbuffer.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
+	
+		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.offscreen));
+	}
+
+	// todo: comment
+	void prepareCompositionPass()
+	{
+		// Descriptor set layout
+		std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings =
+		{
+			// Binding 0: Position input attachment 
+			vkTools::initializers::descriptorSetLayoutBinding(
+				VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
+				VK_SHADER_STAGE_FRAGMENT_BIT,
+				0),
+			// Binding 1: Normal input attachment 
+			vkTools::initializers::descriptorSetLayoutBinding(
+				VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
+				VK_SHADER_STAGE_FRAGMENT_BIT,
+				1),
+			// Binding 2: Albedo input attachment 
+			vkTools::initializers::descriptorSetLayoutBinding(
+				VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
+				VK_SHADER_STAGE_FRAGMENT_BIT,
+				2),
+			// Binding 3: Light positions
+			vkTools::initializers::descriptorSetLayoutBinding(
+				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+				VK_SHADER_STAGE_FRAGMENT_BIT,
+				3),
+		};
+
+		VkDescriptorSetLayoutCreateInfo descriptorLayout =
+			vkTools::initializers::descriptorSetLayoutCreateInfo(
+				setLayoutBindings.data(),
+				static_cast<uint32_t>(setLayoutBindings.size()));
+
+		VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &composition.descriptorSetLayout));
+
+		// Pipeline layout
+		VkPipelineLayoutCreateInfo pPipelineLayoutCreateInfo = 
+			vkTools::initializers::pipelineLayoutCreateInfo(&composition.descriptorSetLayout, 1);
+
+		VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pPipelineLayoutCreateInfo, nullptr, &composition.pipelineLayout));
+
+		// Descriptor sets
+		VkDescriptorSetAllocateInfo allocInfo =
+			vkTools::initializers::descriptorSetAllocateInfo(descriptorPool, &composition.descriptorSetLayout, 1);
+
+		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &composition.descriptorSet));
+
+		// Image descriptors for the offscreen color attachments
+		VkDescriptorImageInfo texDescriptorPosition =
+			vkTools::initializers::descriptorImageInfo(
+				nullptr,
+				attachments.position.view,
+				VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
+
+		VkDescriptorImageInfo texDescriptorNormal =
+			vkTools::initializers::descriptorImageInfo(
+				nullptr,
+				attachments.normal.view,
+				VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
+
+		VkDescriptorImageInfo texDescriptorAlbedo =
+			vkTools::initializers::descriptorImageInfo(
+				nullptr,
+				attachments.albedo.view,
+				VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
+
+		std::vector<VkWriteDescriptorSet> writeDescriptorSets = {
+			// Binding 0: Position texture target
+			vkTools::initializers::writeDescriptorSet(
+				composition.descriptorSet,
+				VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
+				0,
+				&texDescriptorPosition),
+			// Binding 1: Normals texture target
+			vkTools::initializers::writeDescriptorSet(
+				composition.descriptorSet,
+				VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
+				1,
+				&texDescriptorNormal),
+			// Binding 2: Albedo texture target
+			vkTools::initializers::writeDescriptorSet(
+				composition.descriptorSet,
+				VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
+				2,
+				&texDescriptorAlbedo),
+			// Binding 4: Fragment shader lights
+			vkTools::initializers::writeDescriptorSet(
+				composition.descriptorSet,
+				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+				3,
+				&uniformData.fsLights.descriptor),
+		};
+
+		vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, NULL);
+
+		// Pipeline
+		VkPipelineInputAssemblyStateCreateInfo inputAssemblyState =
+			vkTools::initializers::pipelineInputAssemblyStateCreateInfo(VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST, 0, VK_FALSE);
+
+		VkPipelineRasterizationStateCreateInfo rasterizationState =
+			vkTools::initializers::pipelineRasterizationStateCreateInfo(VK_POLYGON_MODE_FILL, VK_CULL_MODE_NONE, VK_FRONT_FACE_CLOCKWISE, 0);
+
+		VkPipelineColorBlendAttachmentState blendAttachmentState =
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE);
+
+		VkPipelineColorBlendStateCreateInfo colorBlendState =
+			vkTools::initializers::pipelineColorBlendStateCreateInfo(1,	&blendAttachmentState);
+
+		std::array<VkPipelineColorBlendAttachmentState, 4> blendAttachmentStates = {
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE),
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE),
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE),
+			vkTools::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE),
+		};
+
+		colorBlendState.attachmentCount = static_cast<uint32_t>(blendAttachmentStates.size());
+		colorBlendState.pAttachments = blendAttachmentStates.data();
+
+		VkPipelineDepthStencilStateCreateInfo depthStencilState =
+			vkTools::initializers::pipelineDepthStencilStateCreateInfo(VK_TRUE, VK_TRUE, VK_COMPARE_OP_LESS_OR_EQUAL);
+
+		VkPipelineViewportStateCreateInfo viewportState =
+			vkTools::initializers::pipelineViewportStateCreateInfo(1, 1, 0);
+
+		VkPipelineMultisampleStateCreateInfo multisampleState =
+			vkTools::initializers::pipelineMultisampleStateCreateInfo(VK_SAMPLE_COUNT_1_BIT, 0);
+
+		std::vector<VkDynamicState> dynamicStateEnables = {	VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR };
+		VkPipelineDynamicStateCreateInfo dynamicState =
+			vkTools::initializers::pipelineDynamicStateCreateInfo(dynamicStateEnables.data(), static_cast<uint32_t>(dynamicStateEnables.size()), 0);
+
+		std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages;
+		
+		shaderStages[0] = loadShader(getAssetPath() + "shaders/subpasses/composition.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
+		shaderStages[1] = loadShader(getAssetPath() + "shaders/subpasses/composition.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
+
+		// Use specialization constants to pass number of lights to the shader
+		VkSpecializationMapEntry specializationEntry{};
+		specializationEntry.constantID = 0;
+		specializationEntry.offset = 0;
+		specializationEntry.size = sizeof(uint32_t);
+
+		uint32_t specializationData = NUM_LIGHTS;
+
+		VkSpecializationInfo specializationInfo;
+		specializationInfo.mapEntryCount = 1;
+		specializationInfo.pMapEntries = &specializationEntry;
+		specializationInfo.dataSize = sizeof(specializationData);
+		specializationInfo.pData = &specializationData;
+
+		shaderStages[1].pSpecializationInfo = &specializationInfo;
+
+		VkGraphicsPipelineCreateInfo pipelineCreateInfo =
+			vkTools::initializers::pipelineCreateInfo(composition.pipelineLayout, renderPass, 0);
+
+		VkPipelineVertexInputStateCreateInfo emptyInputState{};
+		emptyInputState.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
+
+		pipelineCreateInfo.pVertexInputState = &emptyInputState;
+		pipelineCreateInfo.pInputAssemblyState = &inputAssemblyState;
+		pipelineCreateInfo.pRasterizationState = &rasterizationState;
+		pipelineCreateInfo.pColorBlendState = &colorBlendState;
+		pipelineCreateInfo.pMultisampleState = &multisampleState;
+		pipelineCreateInfo.pViewportState = &viewportState;
+		pipelineCreateInfo.pDepthStencilState = &depthStencilState;
+		pipelineCreateInfo.pDynamicState = &dynamicState;
+		pipelineCreateInfo.stageCount = static_cast<uint32_t>(shaderStages.size());
+		pipelineCreateInfo.pStages = shaderStages.data();
+
+		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &composition.pipeline));
+	}
+
+	// Prepare and initialize uniform buffer containing shader uniforms
+	void prepareUniformBuffers()
+	{
+		// Deferred vertex shader
+		createBuffer(
+			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
+			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
+			sizeof(uboOffscreenVS),
+			nullptr,
+			&uniformData.vsOffscreen.buffer,
+			&uniformData.vsOffscreen.memory,
+			&uniformData.vsOffscreen.descriptor);
+
+		// Deferred fragment shader
+		createBuffer(
+			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
+			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
+			sizeof(uboFragmentLights),
+			nullptr,
+			&uniformData.fsLights.buffer,
+			&uniformData.fsLights.memory,
+			&uniformData.fsLights.descriptor);
+
+		// Update
+		updateUniformBufferDeferredMatrices();
+		updateUniformBufferDeferredLights();
+	}
+
+	void updateUniformBufferDeferredMatrices()
+	{
+		uboOffscreenVS.projection = camera.matrices.perspective;
+		uboOffscreenVS.view = camera.matrices.view;
+		uboOffscreenVS.model = glm::mat4();
+
+		uint8_t *pData;
+		VK_CHECK_RESULT(vkMapMemory(device, uniformData.vsOffscreen.memory, 0, sizeof(uboOffscreenVS), 0, (void **)&pData));
+		memcpy(pData, &uboOffscreenVS, sizeof(uboOffscreenVS));
+		vkUnmapMemory(device, uniformData.vsOffscreen.memory);
+	}
+
+	void initLights()
+	{
+		std::vector<glm::vec3> colors =
+		{
+			glm::vec3(1.0f, 1.0f, 1.0f),
+			glm::vec3(1.0f, 0.0f, 0.0f),
+			glm::vec3(0.0f, 1.0f, 0.0f),
+			glm::vec3(0.0f, 0.0f, 1.0f),
+			glm::vec3(1.0f, 1.0f, 0.0f),
+		};
+
+		std::mt19937 rndGen((unsigned)time(NULL));
+		std::uniform_real_distribution<float> rndDist(-1.0f, 1.0f);
+		std::uniform_int_distribution<uint32_t> rndCol(0, colors.size()-1);
+
+		for (auto& light : uboFragmentLights.lights)
+		{
+			light.position = glm::vec4(rndDist(rndGen) * 6.0f, 0.25f + std::abs(rndDist(rndGen)) * 4.0f, rndDist(rndGen) * 6.0f, 1.0f);
+			light.color = colors[rndCol(rndGen)];
+			light.radius = 1.0f + std::abs(rndDist(rndGen));			
+		}
+	}
+
+	// Update fragment shader light position uniform block
+	void updateUniformBufferDeferredLights()
+	{
+		// Current view position
+		uboFragmentLights.viewPos = glm::vec4(camera.position, 0.0f) * glm::vec4(-1.0f, 1.0f, -1.0f, 1.0f);
+
+		uint8_t *pData;
+		VK_CHECK_RESULT(vkMapMemory(device, uniformData.fsLights.memory, 0, sizeof(uboFragmentLights), 0, (void **)&pData));
+		memcpy(pData, &uboFragmentLights, sizeof(uboFragmentLights));
+		vkUnmapMemory(device, uniformData.fsLights.memory);
+	}
+
+	void draw()
+	{
+		VulkanExampleBase::prepareFrame();
+
+		// Command buffer to be sumitted to the queue
+		submitInfo.commandBufferCount = 1;
+		submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
+
+		// Submit to queue
+		VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
+
+		VulkanExampleBase::submitFrame();
+	}
+
+	void prepare()
+	{
+		VulkanExampleBase::prepare();
+		loadAssets();
+		setupVertexDescriptions();
+		initLights();
+		prepareUniformBuffers();
+		setupDescriptorSetLayout();
+		preparePipelines();
+		setupDescriptorPool();
+		setupDescriptorSet();
+		prepareCompositionPass();
+		buildCommandBuffers();
+		prepared = true;
+	}
+
+	virtual void render()
+	{
+		if (!prepared)
+			return;
+		draw();
+	}
+
+	virtual void viewChanged()
+	{
+		updateUniformBufferDeferredMatrices();
+		updateUniformBufferDeferredLights();
+	}
+
+	virtual void keyPressed(uint32_t keyCode)
+	{
+		switch (keyCode)
+		{
+		case KEY_F1:
+		case GAMEPAD_BUTTON_A:
+			initLights();
+			updateUniformBufferDeferredLights();
+			break;
+		}
+	}
+};
+
+VULKAN_EXAMPLE_MAIN()

subpasses/subpasses.vcxproj

@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{DE1DEF4B-307E-45C2-90CC-8023327294E2}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+    <OutDir>$(SolutionDir)\bin\</OutDir>
+    <IntDir>$(SolutionDir)\bin\intermediate\$(ProjectName)\$(ConfigurationName)</IntDir>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>true</LinkIncremental>
+    <OutDir>$(SolutionDir)\bin\</OutDir>
+    <IntDir>$(SolutionDir)\bin\intermediate\$(ProjectName)\$(ConfigurationName)</IntDir>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;VK_USE_PLATFORM_WIN32_KHR;_USE_MATH_DEFINES;NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <WarningLevel>Level3</WarningLevel>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <Optimization>Disabled</Optimization>
+      <AdditionalIncludeDirectories>..\base;..\external\glm;..\external\gli;..\external\assimp;..\external;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalOptions>/FS %(AdditionalOptions)</AdditionalOptions>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Windows</SubSystem>
+      <AdditionalDependencies>..\libs\vulkan\vulkan-1.lib;..\libs\assimp\assimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;VK_USE_PLATFORM_WIN32_KHR;_USE_MATH_DEFINES;NOMINMAX;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <WarningLevel>Level3</WarningLevel>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <AdditionalIncludeDirectories>..\base;..\external\glm;..\external\gli;..\external\assimp;..\external;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>..\libs\vulkan\vulkan-1.lib;..\libs\assimp\assimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\base\vulkandebug.cpp" />
+    <ClCompile Include="..\base\vulkanexamplebase.cpp" />
+    <ClCompile Include="..\base\vulkantools.cpp" />
+    <ClCompile Include="subpasses.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\base\vulkandebug.h" />
+    <ClInclude Include="..\base\vulkanexamplebase.h" />
+    <ClInclude Include="..\base\vulkantools.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\data\shaders\subpasses\composition.frag" />
+    <None Include="..\data\shaders\subpasses\composition.vert" />
+    <None Include="..\data\shaders\subpasses\gbuffer.frag" />
+    <None Include="..\data\shaders\subpasses\gbuffer.vert" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

subpasses/subpasses.vcxproj.filters

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+    <Filter Include="Shaders">
+      <UniqueIdentifier>{12c674f2-7199-4bf4-b710-4535b9f6d3f8}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\base\vulkandebug.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\base\vulkanexamplebase.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\base\vulkantools.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="subpasses.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\base\vulkandebug.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\base\vulkanexamplebase.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\base\vulkantools.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\data\shaders\subpasses\composition.frag">
+      <Filter>Shaders</Filter>
+    </None>
+    <None Include="..\data\shaders\subpasses\composition.vert">
+      <Filter>Shaders</Filter>
+    </None>
+    <None Include="..\data\shaders\subpasses\gbuffer.frag">
+      <Filter>Shaders</Filter>
+    </None>
+    <None Include="..\data\shaders\subpasses\gbuffer.vert">
+      <Filter>Shaders</Filter>
+    </None>
+  </ItemGroup>
+</Project>

vulkanExamples.sln

@@ -115,6 +115,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "deferredmultisampling", "de
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "computecullandlod", "computecullandlod\computecullandlod.vcxproj", "{8418A364-3D1C-4938-A2CC-C1D1433039F2}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "subpasses", "subpasses\subpasses.vcxproj", "{DE1DEF4B-307E-45C2-90CC-8023327294E2}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -285,6 +287,10 @@ Global
 		{8418A364-3D1C-4938-A2CC-C1D1433039F2}.Debug|x64.Build.0 = Debug|x64
 		{8418A364-3D1C-4938-A2CC-C1D1433039F2}.Release|x64.ActiveCfg = Release|x64
 		{8418A364-3D1C-4938-A2CC-C1D1433039F2}.Release|x64.Build.0 = Release|x64
+		{DE1DEF4B-307E-45C2-90CC-8023327294E2}.Debug|x64.ActiveCfg = Debug|x64
+		{DE1DEF4B-307E-45C2-90CC-8023327294E2}.Debug|x64.Build.0 = Debug|x64
+		{DE1DEF4B-307E-45C2-90CC-8023327294E2}.Release|x64.ActiveCfg = Release|x64
+		{DE1DEF4B-307E-45C2-90CC-8023327294E2}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE