/*
* Vulkan Example - Deferred shading with multiple render targets (aka G-Buffer) example
*
* 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>

#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

// Texture properties
#define TEX_DIM 2048
#define TEX_FILTER VK_FILTER_LINEAR

// Offscreen frame buffer properties
#define FB_DIM TEX_DIM

// Vertex layout for this example
std::vector<vkMeshLoader::VertexLayout> vertexLayout =
{
	vkMeshLoader::VERTEX_LAYOUT_POSITION,
	vkMeshLoader::VERTEX_LAYOUT_UV,
	vkMeshLoader::VERTEX_LAYOUT_COLOR,
	vkMeshLoader::VERTEX_LAYOUT_NORMAL,
	vkMeshLoader::VERTEX_LAYOUT_TANGENT
};

class VulkanExample : public VulkanExampleBase
{
public:
	bool debugDisplay = false;

	struct {
		struct {
			vkTools::VulkanTexture colorMap;
			vkTools::VulkanTexture normalMap;
		} model;
		struct {
			vkTools::VulkanTexture colorMap;
			vkTools::VulkanTexture normalMap;
		} floor;
	} textures;

	struct {
		vkMeshLoader::MeshBuffer model;
		vkMeshLoader::MeshBuffer floor;
		vkMeshLoader::MeshBuffer quad;
	} meshes;

	struct {
		VkPipelineVertexInputStateCreateInfo inputState;
		std::vector<VkVertexInputBindingDescription> bindingDescriptions;
		std::vector<VkVertexInputAttributeDescription> attributeDescriptions;
	} vertices;

	struct {
		glm::mat4 projection;
		glm::mat4 model;
		glm::mat4 view;
		glm::vec4 instancePos[3];
	} uboVS, uboOffscreenVS;

	struct Light {
		glm::vec4 position;
		glm::vec3 color;
		float radius;
	};

	struct {
		Light lights[6];
		glm::vec4 viewPos;
	} uboFragmentLights;

	struct {
		vkTools::UniformData vsFullScreen;
		vkTools::UniformData vsOffscreen;
		vkTools::UniformData fsLights;
	} uniformData;

	struct {
		VkPipeline deferred;
		VkPipeline offscreen;
		VkPipeline debug;
	} pipelines;

	struct {
		VkPipelineLayout deferred; 
		VkPipelineLayout offscreen;
	} pipelineLayouts;

	struct {
		VkDescriptorSet model;
		VkDescriptorSet floor;
	} descriptorSets;

	VkDescriptorSet descriptorSet;
	VkDescriptorSetLayout descriptorSetLayout;

	// Framebuffer for offscreen rendering
	struct FrameBufferAttachment {
		VkImage image;
		VkDeviceMemory mem;
		VkImageView view;
		VkFormat format;
	};
	struct FrameBuffer {
		int32_t width, height;
		VkFramebuffer frameBuffer;		
		FrameBufferAttachment position, normal, albedo;
		FrameBufferAttachment depth;
		VkRenderPass renderPass;
	} offScreenFrameBuf;
	
	// One sampler for the frame buffer color attachments
	VkSampler colorSampler;

	VkCommandBuffer offScreenCmdBuffer = VK_NULL_HANDLE;

	// Semaphore used to synchronize between offscreen and final scene rendering
	VkSemaphore offscreenSemaphore = VK_NULL_HANDLE;

	VulkanExample() : VulkanExampleBase(ENABLE_VALIDATION)
	{
		zoom = -8.0f;
		rotation = { 0.0f, 0.0f, 0.0f };
		enableTextOverlay = true;
		title = "Vulkan Example - Deferred shading (2016 by Sascha Willems)";
		camera.type = Camera::CameraType::firstperson;
		camera.movementSpeed = 5.0f;
#ifndef __ANDROID__
		camera.rotationSpeed = 0.25f;
#endif
		camera.position = { 2.15f, 0.3f, -8.75f };
		camera.setRotation(glm::vec3(-0.75f, 12.5f, 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

		vkDestroySampler(device, colorSampler, nullptr);

		// Frame buffer

		// Color attachments
		vkDestroyImageView(device, offScreenFrameBuf.position.view, nullptr);
		vkDestroyImage(device, offScreenFrameBuf.position.image, nullptr);
		vkFreeMemory(device, offScreenFrameBuf.position.mem, nullptr);

		vkDestroyImageView(device, offScreenFrameBuf.normal.view, nullptr);
		vkDestroyImage(device, offScreenFrameBuf.normal.image, nullptr);
		vkFreeMemory(device, offScreenFrameBuf.normal.mem, nullptr);

		vkDestroyImageView(device, offScreenFrameBuf.albedo.view, nullptr);
		vkDestroyImage(device, offScreenFrameBuf.albedo.image, nullptr);
		vkFreeMemory(device, offScreenFrameBuf.albedo.mem, nullptr);

		// Depth attachment
		vkDestroyImageView(device, offScreenFrameBuf.depth.view, nullptr);
		vkDestroyImage(device, offScreenFrameBuf.depth.image, nullptr);
		vkFreeMemory(device, offScreenFrameBuf.depth.mem, nullptr);

		vkDestroyFramebuffer(device, offScreenFrameBuf.frameBuffer, nullptr);

		vkDestroyPipeline(device, pipelines.deferred, nullptr);
		vkDestroyPipeline(device, pipelines.offscreen, nullptr);
		vkDestroyPipeline(device, pipelines.debug, nullptr);

		vkDestroyPipelineLayout(device, pipelineLayouts.deferred, nullptr);
		vkDestroyPipelineLayout(device, pipelineLayouts.offscreen, nullptr);

		vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);

		// Meshes
		vkMeshLoader::freeMeshBufferResources(device, &meshes.model);
		vkMeshLoader::freeMeshBufferResources(device, &meshes.floor);
		vkMeshLoader::freeMeshBufferResources(device, &meshes.quad);

		// Uniform buffers
		vkTools::destroyUniformData(device, &uniformData.vsOffscreen);
		vkTools::destroyUniformData(device, &uniformData.vsFullScreen);
		vkTools::destroyUniformData(device, &uniformData.fsLights);

		vkFreeCommandBuffers(device, cmdPool, 1, &offScreenCmdBuffer);

		vkDestroyRenderPass(device, offScreenFrameBuf.renderPass, nullptr);

		textureLoader->destroyTexture(textures.model.colorMap);
		textureLoader->destroyTexture(textures.model.normalMap);
		textureLoader->destroyTexture(textures.floor.colorMap);
		textureLoader->destroyTexture(textures.floor.normalMap);

		vkDestroySemaphore(device, offscreenSemaphore, nullptr);
	}

	// Create a frame buffer attachment
	void createAttachment(
		VkFormat format,  
		VkImageUsageFlagBits usage,
		FrameBufferAttachment *attachment,
		VkCommandBuffer layoutCmd)
	{
		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 = offScreenFrameBuf.width;
		image.extent.height = offScreenFrameBuf.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_SAMPLED_BIT;

		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));
	}

	// Prepare a new framebuffer for offscreen rendering
	// The contents of this framebuffer are then
	// blitted to our render target
	void prepareOffscreenFramebuffer()
	{
		VkCommandBuffer layoutCmd = VulkanExampleBase::createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);

		offScreenFrameBuf.width = FB_DIM;
		offScreenFrameBuf.height = FB_DIM;

		// Color attachments

		// (World space) Positions
		createAttachment(
			VK_FORMAT_R16G16B16A16_SFLOAT,
			VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
			&offScreenFrameBuf.position,
			layoutCmd);

		// (World space) Normals
		createAttachment(
			VK_FORMAT_R16G16B16A16_SFLOAT,
			VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
			&offScreenFrameBuf.normal,
			layoutCmd);

		// Albedo (color)
		createAttachment(
			VK_FORMAT_R8G8B8A8_UNORM,
			VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
			&offScreenFrameBuf.albedo,
			layoutCmd);

		// Depth attachment

		// Find a suitable depth format
		VkFormat attDepthFormat;
		VkBool32 validDepthFormat = vkTools::getSupportedDepthFormat(physicalDevice, &attDepthFormat);
		assert(validDepthFormat);

		createAttachment(
			attDepthFormat,
			VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT,
			&offScreenFrameBuf.depth,
			layoutCmd);

		VulkanExampleBase::flushCommandBuffer(layoutCmd, queue, true);

		// Set up separate renderpass with references
		// to the color and depth attachments

		std::array<VkAttachmentDescription, 4> attachmentDescs = {};

		// Init attachment properties
		for (uint32_t i = 0; i < 4; ++i)
		{
			attachmentDescs[i].samples = VK_SAMPLE_COUNT_1_BIT;
			attachmentDescs[i].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
			attachmentDescs[i].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
			attachmentDescs[i].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
			attachmentDescs[i].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
			if (i == 3)
			{
				attachmentDescs[i].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
				attachmentDescs[i].finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
			}
			else
			{
				attachmentDescs[i].initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
				attachmentDescs[i].finalLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
			}
		}

		// Formats
		attachmentDescs[0].format = offScreenFrameBuf.position.format;
		attachmentDescs[1].format = offScreenFrameBuf.normal.format;
		attachmentDescs[2].format = offScreenFrameBuf.albedo.format;
		attachmentDescs[3].format = offScreenFrameBuf.depth.format;

		std::vector<VkAttachmentReference> colorReferences;
		colorReferences.push_back({ 0, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL });
		colorReferences.push_back({ 1, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL });
		colorReferences.push_back({ 2, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL });

		VkAttachmentReference depthReference = {};
		depthReference.attachment = 3;
		depthReference.layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;

		VkSubpassDescription subpass = {};
		subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
		subpass.pColorAttachments = colorReferences.data();
		subpass.colorAttachmentCount = static_cast<uint32_t>(colorReferences.size());
		subpass.pDepthStencilAttachment = &depthReference;

		// Use subpass dependencies for attachment layput transitions
		std::array<VkSubpassDependency, 2> 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;

		dependencies[1].srcSubpass = 0;													
		dependencies[1].dstSubpass = VK_SUBPASS_EXTERNAL;								
		dependencies[1].srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
		dependencies[1].dstStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
		dependencies[1].srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
		dependencies[1].dstAccessMask = VK_ACCESS_MEMORY_READ_BIT;
		dependencies[1].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;

		VkRenderPassCreateInfo renderPassInfo = {};
		renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
		renderPassInfo.pAttachments = attachmentDescs.data();
		renderPassInfo.attachmentCount = static_cast<uint32_t>(attachmentDescs.size());
		renderPassInfo.subpassCount = 1;
		renderPassInfo.pSubpasses = &subpass;
		renderPassInfo.dependencyCount = 2;
		renderPassInfo.pDependencies = dependencies.data();
	
		VK_CHECK_RESULT(vkCreateRenderPass(device, &renderPassInfo, nullptr, &offScreenFrameBuf.renderPass));
	
		std::array<VkImageView,4> attachments;
		attachments[0] = offScreenFrameBuf.position.view;
		attachments[1] = offScreenFrameBuf.normal.view;
		attachments[2] = offScreenFrameBuf.albedo.view;
		attachments[3] = offScreenFrameBuf.depth.view;

		VkFramebufferCreateInfo fbufCreateInfo = {};
		fbufCreateInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
		fbufCreateInfo.pNext = NULL;
		fbufCreateInfo.renderPass = offScreenFrameBuf.renderPass;
		fbufCreateInfo.pAttachments = attachments.data();
		fbufCreateInfo.attachmentCount = static_cast<uint32_t>(attachments.size());
		fbufCreateInfo.width = offScreenFrameBuf.width;
		fbufCreateInfo.height = offScreenFrameBuf.height;
		fbufCreateInfo.layers = 1;
		VK_CHECK_RESULT(vkCreateFramebuffer(device, &fbufCreateInfo, nullptr, &offScreenFrameBuf.frameBuffer));

		// Create sampler to sample from the color attachments
		VkSamplerCreateInfo sampler = vkTools::initializers::samplerCreateInfo();
		sampler.magFilter = VK_FILTER_NEAREST;
		sampler.minFilter = VK_FILTER_NEAREST;
		sampler.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
		sampler.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
		sampler.addressModeV = sampler.addressModeU;
		sampler.addressModeW = sampler.addressModeU;
		sampler.mipLodBias = 0.0f;
		sampler.maxAnisotropy = 0;
		sampler.minLod = 0.0f;
		sampler.maxLod = 1.0f;
		sampler.borderColor = VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE;
		VK_CHECK_RESULT(vkCreateSampler(device, &sampler, nullptr, &colorSampler));
	}

	// Build command buffer for rendering the scene to the offscreen frame buffer attachments
	void buildDeferredCommandBuffer()
	{
		if (offScreenCmdBuffer == VK_NULL_HANDLE)
		{
			offScreenCmdBuffer = VulkanExampleBase::createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, false);
		}

		// Create a semaphore used to synchronize offscreen rendering and usage
		VkSemaphoreCreateInfo semaphoreCreateInfo = vkTools::initializers::semaphoreCreateInfo();
		VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCreateInfo, nullptr, &offscreenSemaphore));

		VkCommandBufferBeginInfo cmdBufInfo = vkTools::initializers::commandBufferBeginInfo();

		// Clear values for all attachments written in the fragment sahder
		std::array<VkClearValue,4> clearValues;
		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].depthStencil = { 1.0f, 0 };

		VkRenderPassBeginInfo renderPassBeginInfo = vkTools::initializers::renderPassBeginInfo();
		renderPassBeginInfo.renderPass =  offScreenFrameBuf.renderPass;
		renderPassBeginInfo.framebuffer = offScreenFrameBuf.frameBuffer;
		renderPassBeginInfo.renderArea.extent.width = offScreenFrameBuf.width;
		renderPassBeginInfo.renderArea.extent.height = offScreenFrameBuf.height;
		renderPassBeginInfo.clearValueCount = static_cast<uint32_t>(clearValues.size());
		renderPassBeginInfo.pClearValues = clearValues.data();

		VK_CHECK_RESULT(vkBeginCommandBuffer(offScreenCmdBuffer, &cmdBufInfo));

		vkCmdBeginRenderPass(offScreenCmdBuffer, &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);

		VkViewport viewport = vkTools::initializers::viewport((float)offScreenFrameBuf.width, (float)offScreenFrameBuf.height, 0.0f, 1.0f);
		vkCmdSetViewport(offScreenCmdBuffer, 0, 1, &viewport);

		VkRect2D scissor = vkTools::initializers::rect2D(offScreenFrameBuf.width, offScreenFrameBuf.height, 0, 0);
		vkCmdSetScissor(offScreenCmdBuffer, 0, 1, &scissor);

		vkCmdBindPipeline(offScreenCmdBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.offscreen);

		VkDeviceSize offsets[1] = { 0 };

		// Background
		vkCmdBindDescriptorSets(offScreenCmdBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.offscreen, 0, 1, &descriptorSets.floor, 0, NULL);
		vkCmdBindVertexBuffers(offScreenCmdBuffer, VERTEX_BUFFER_BIND_ID, 1, &meshes.floor.vertices.buf, offsets);
		vkCmdBindIndexBuffer(offScreenCmdBuffer, meshes.floor.indices.buf, 0, VK_INDEX_TYPE_UINT32);
		vkCmdDrawIndexed(offScreenCmdBuffer, meshes.floor.indexCount, 1, 0, 0, 0);

		// Object
		vkCmdBindDescriptorSets(offScreenCmdBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.offscreen, 0, 1, &descriptorSets.model, 0, NULL);
		vkCmdBindVertexBuffers(offScreenCmdBuffer, VERTEX_BUFFER_BIND_ID, 1, &meshes.model.vertices.buf, offsets);
		vkCmdBindIndexBuffer(offScreenCmdBuffer, meshes.model.indices.buf, 0, VK_INDEX_TYPE_UINT32);
		vkCmdDrawIndexed(offScreenCmdBuffer, meshes.model.indexCount, 3, 0, 0, 0);

		vkCmdEndRenderPass(offScreenCmdBuffer);

		VK_CHECK_RESULT(vkEndCommandBuffer(offScreenCmdBuffer));
	}

	void loadTextures()
	{
		textureLoader->loadTexture(getAssetPath() + "models/armor/colormap.ktx", VK_FORMAT_BC3_UNORM_BLOCK,	&textures.model.colorMap);
		textureLoader->loadTexture(getAssetPath() + "models/armor/normalmap.ktx", VK_FORMAT_BC3_UNORM_BLOCK, &textures.model.normalMap);

		textureLoader->loadTexture(getAssetPath() + "textures/pattern_35_bc3.ktx", VK_FORMAT_BC3_UNORM_BLOCK, &textures.floor.colorMap);
		textureLoader->loadTexture(getAssetPath() + "textures/pattern_35_normalmap_bc3.ktx", VK_FORMAT_BC3_UNORM_BLOCK, &textures.floor.normalMap);
	}

	void reBuildCommandBuffers()
	{
		if (!checkCommandBuffers())
		{
			destroyCommandBuffers();
			createCommandBuffers();
		}
		buildCommandBuffers();
	}

	void buildCommandBuffers()
	{
		VkCommandBufferBeginInfo cmdBufInfo = vkTools::initializers::commandBufferBeginInfo();

		VkClearValue clearValues[2];
		clearValues[0].color = { { 0.0f, 0.0f, 0.2f, 0.0f } };
		clearValues[1].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 = 2;
		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));

			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 };
			vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.deferred, 0, 1, &descriptorSet, 0, NULL);

			if (debugDisplay)
			{
				vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.debug);
				vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &meshes.quad.vertices.buf, offsets);
				vkCmdBindIndexBuffer(drawCmdBuffers[i], meshes.quad.indices.buf, 0, VK_INDEX_TYPE_UINT32);
				vkCmdDrawIndexed(drawCmdBuffers[i], meshes.quad.indexCount, 1, 0, 0, 1);
				// Move viewport to display final composition in lower right corner
				viewport.x = viewport.width * 0.5f;
				viewport.y = viewport.height * 0.5f;
				vkCmdSetViewport(drawCmdBuffers[i], 0, 1, &viewport);
			}

			// Final composition as full screen quad
			vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.deferred);
			vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &meshes.quad.vertices.buf, offsets);
			vkCmdBindIndexBuffer(drawCmdBuffers[i], meshes.quad.indices.buf, 0, VK_INDEX_TYPE_UINT32);
			vkCmdDrawIndexed(drawCmdBuffers[i], 6, 1, 0, 0, 1);

			vkCmdEndRenderPass(drawCmdBuffers[i]);

			VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
		}
	}

	void loadMeshes()
	{
		loadMesh(getAssetPath() + "models/armor/armor.dae", &meshes.model, vertexLayout, 1.0f);

		vkMeshLoader::MeshCreateInfo meshCreateInfo;
		meshCreateInfo.scale = glm::vec3(2.0f);
		meshCreateInfo.uvscale = glm::vec2(4.0f);
		meshCreateInfo.center = glm::vec3(0.0f, 2.35f, 0.0f);
		loadMesh(getAssetPath() + "models/plane.obj", &meshes.floor, vertexLayout, &meshCreateInfo);
	}

	void generateQuads()
	{
		// Setup vertices for multiple screen aligned quads
		// Used for displaying final result and debug 
		struct Vertex {
			float pos[3];
			float uv[2];
			float col[3];
			float normal[3];
			float tangent[3];
		};

		std::vector<Vertex> vertexBuffer;

		float x = 0.0f;
		float y = 0.0f;
		for (uint32_t i = 0; i < 3; i++)
		{
			// Last component of normal is used for debug display sampler index
			vertexBuffer.push_back({ { x+1.0f, y+1.0f, 0.0f }, { 1.0f, 1.0f }, { 1.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, (float)i } });
			vertexBuffer.push_back({ { x,      y+1.0f, 0.0f }, { 0.0f, 1.0f }, { 1.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, (float)i } });
			vertexBuffer.push_back({ { x,      y,      0.0f }, { 0.0f, 0.0f }, { 1.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, (float)i } });
			vertexBuffer.push_back({ { x+1.0f, y,      0.0f }, { 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, (float)i } });
			x += 1.0f;
			if (x > 1.0f)
			{
				x = 0.0f;
				y += 1.0f;
			}
		}

		createBuffer(
			VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
			vertexBuffer.size() * sizeof(Vertex),
			vertexBuffer.data(),
			&meshes.quad.vertices.buf,
			&meshes.quad.vertices.mem);

		// Setup indices
		std::vector<uint32_t> indexBuffer = { 0,1,2, 2,3,0 };
		for (uint32_t i = 0; i < 3; ++i)
		{
			uint32_t indices[6] = { 0,1,2, 2,3,0 };
			for (auto index : indices)
			{
				indexBuffer.push_back(i * 4 + index);
			}
		}
		meshes.quad.indexCount = static_cast<uint32_t>(indexBuffer.size());

		createBuffer(
			VK_BUFFER_USAGE_INDEX_BUFFER_BIT,
			indexBuffer.size() * sizeof(uint32_t),
			indexBuffer.data(),
			&meshes.quad.indices.buf,
			&meshes.quad.indices.mem);
	}

	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(5);
		// Location 0: Position
		vertices.attributeDescriptions[0] =
			vkTools::initializers::vertexInputAttributeDescription(
				VERTEX_BUFFER_BIND_ID,
				0,
				VK_FORMAT_R32G32B32_SFLOAT,
				0);
		// Location 1: Texture coordinates
		vertices.attributeDescriptions[1] =
			vkTools::initializers::vertexInputAttributeDescription(
				VERTEX_BUFFER_BIND_ID,
				1,
				VK_FORMAT_R32G32_SFLOAT,
				sizeof(float) * 3);
		// Location 2: Color
		vertices.attributeDescriptions[2] =
			vkTools::initializers::vertexInputAttributeDescription(
				VERTEX_BUFFER_BIND_ID,
				2,
				VK_FORMAT_R32G32B32_SFLOAT,
				sizeof(float) * 5);
		// Location 3: Normal
		vertices.attributeDescriptions[3] =
			vkTools::initializers::vertexInputAttributeDescription(
				VERTEX_BUFFER_BIND_ID,
				3,
				VK_FORMAT_R32G32B32_SFLOAT,
				sizeof(float) * 8);
		// Location 4: Tangent
		vertices.attributeDescriptions[4] =
			vkTools::initializers::vertexInputAttributeDescription(
				VERTEX_BUFFER_BIND_ID,
				4,
				VK_FORMAT_R32G32B32_SFLOAT,
				sizeof(float) * 11);

		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)
		};

		VkDescriptorPoolCreateInfo descriptorPoolInfo =
			vkTools::initializers::descriptorPoolCreateInfo(
				static_cast<uint32_t>(poolSizes.size()),
				poolSizes.data(),
				3);

		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),
			// Binding 1 : Position texture target / Scene colormap
			vkTools::initializers::descriptorSetLayoutBinding(
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				VK_SHADER_STAGE_FRAGMENT_BIT,
				1),
			// Binding 2 : Normals texture target
			vkTools::initializers::descriptorSetLayoutBinding(
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				VK_SHADER_STAGE_FRAGMENT_BIT,
				2),
			// Binding 3 : Albedo texture target
			vkTools::initializers::descriptorSetLayoutBinding(
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				VK_SHADER_STAGE_FRAGMENT_BIT,
				3),
			// Binding 4 : Fragment shader uniform buffer
			vkTools::initializers::descriptorSetLayoutBinding(
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				VK_SHADER_STAGE_FRAGMENT_BIT,
				4),
		};

		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);

		VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pPipelineLayoutCreateInfo, nullptr, &pipelineLayouts.deferred));

		// Offscreen (scene) rendering pipeline layout
		VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pPipelineLayoutCreateInfo, nullptr, &pipelineLayouts.offscreen));
	}

	void setupDescriptorSet()
	{
		std::vector<VkWriteDescriptorSet> writeDescriptorSets;

		// Textured quad descriptor set
		VkDescriptorSetAllocateInfo allocInfo =
			vkTools::initializers::descriptorSetAllocateInfo(
				descriptorPool,
				&descriptorSetLayout,
				1);

		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSet));

		// Image descriptors for the offscreen color attachments
		VkDescriptorImageInfo texDescriptorPosition =
			vkTools::initializers::descriptorImageInfo(
				colorSampler,
				offScreenFrameBuf.position.view,
				VK_IMAGE_LAYOUT_GENERAL);

		VkDescriptorImageInfo texDescriptorNormal =
			vkTools::initializers::descriptorImageInfo(
				colorSampler,
				offScreenFrameBuf.normal.view,
				VK_IMAGE_LAYOUT_GENERAL);

		VkDescriptorImageInfo texDescriptorAlbedo =
			vkTools::initializers::descriptorImageInfo(
				colorSampler,
				offScreenFrameBuf.albedo.view,
				VK_IMAGE_LAYOUT_GENERAL);

		writeDescriptorSets = {
			// Binding 0 : Vertex shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
			descriptorSet,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				0,
				&uniformData.vsFullScreen.descriptor),
			// Binding 1 : Position texture target
			vkTools::initializers::writeDescriptorSet(
				descriptorSet,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				1,
				&texDescriptorPosition),
			// Binding 2 : Normals texture target
			vkTools::initializers::writeDescriptorSet(
				descriptorSet,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				2,
				&texDescriptorNormal),
			// Binding 3 : Albedo texture target
			vkTools::initializers::writeDescriptorSet(
				descriptorSet,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				3,
				&texDescriptorAlbedo),
			// Binding 4 : Fragment shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSet,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				4,
				&uniformData.fsLights.descriptor),
		};

		vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, NULL);

		// Offscreen (scene)

		// Model
		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.model));
		writeDescriptorSets = 
		{
			// Binding 0: Vertex shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.model,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				0,
				&uniformData.vsOffscreen.descriptor),
			// Binding 1: Color map
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.model,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				1,
				&textures.model.colorMap.descriptor),
			// Binding 2: Normal map
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.model,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				2,
				&textures.model.normalMap.descriptor)
		};
		vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, NULL);

		// Backbround
		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.floor));
		writeDescriptorSets =
		{
			// Binding 0: Vertex shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.floor,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				0,
				&uniformData.vsOffscreen.descriptor),
			// Binding 1: Color map
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.floor,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				1,
				&textures.floor.colorMap.descriptor),
			// Binding 2: Normal map
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.floor,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				2,
				&textures.floor.normalMap.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;

		shaderStages[0] = loadShader(getAssetPath() + "shaders/deferred/deferred.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/deferred/deferred.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);

		VkGraphicsPipelineCreateInfo pipelineCreateInfo =
			vkTools::initializers::pipelineCreateInfo(
				pipelineLayouts.deferred,
				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();

		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.deferred));

		// Debug display pipeline
		shaderStages[0] = loadShader(getAssetPath() + "shaders/deferred/debug.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/deferred/debug.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.debug));
		
		// Offscreen pipeline
		shaderStages[0] = loadShader(getAssetPath() + "shaders/deferred/mrt.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/deferred/mrt.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);

		// Separate render pass
		pipelineCreateInfo.renderPass = offScreenFrameBuf.renderPass;

		// Separate layout
		pipelineCreateInfo.layout = pipelineLayouts.offscreen;

		// Blend attachment states required for all color attachments
		// This is important, as color write mask will otherwise be 0x0 and you
		// won't see anything rendered to the attachment
		std::array<VkPipelineColorBlendAttachmentState, 3> blendAttachmentStates = {
			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();

		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.offscreen));
	}

	// Prepare and initialize uniform buffer containing shader uniforms
	void prepareUniformBuffers()
	{
		// Fullscreen vertex shader
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
			sizeof(uboVS),
			nullptr,
			&uniformData.vsFullScreen.buffer,
			&uniformData.vsFullScreen.memory,
			&uniformData.vsFullScreen.descriptor);

		// 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);

		// Init some values
		uboOffscreenVS.instancePos[0] = glm::vec4(0.0f);
		uboOffscreenVS.instancePos[1] = glm::vec4(-4.0f, 0.0, -4.0f, 0.0f);
		uboOffscreenVS.instancePos[2] = glm::vec4(4.0f, 0.0, -4.0f, 0.0f);

		// Update
		updateUniformBuffersScreen();
		updateUniformBufferDeferredMatrices();
		updateUniformBufferDeferredLights();
	}

	void updateUniformBuffersScreen()
	{
		if (debugDisplay)
		{
			uboVS.projection = glm::ortho(0.0f, 2.0f, 0.0f, 2.0f, -1.0f, 1.0f);
		} 
		else
		{
			uboVS.projection = glm::ortho(0.0f, 1.0f, 0.0f, 1.0f, -1.0f, 1.0f);
		}
		uboVS.model = glm::mat4();

		uint8_t *pData;
		VK_CHECK_RESULT(vkMapMemory(device, uniformData.vsFullScreen.memory, 0, sizeof(uboVS), 0, (void **)&pData));
		memcpy(pData, &uboVS, sizeof(uboVS));
		vkUnmapMemory(device, uniformData.vsFullScreen.memory);
	}

	void updateUniformBufferDeferredMatrices()
	{
		uboOffscreenVS.projection = glm::perspective(glm::radians(45.0f), (float)width / (float)height, 0.1f, 256.0f);
		uboOffscreenVS.view = glm::translate(glm::mat4(), glm::vec3(0.0f, 0.0f, zoom));

		uboOffscreenVS.model = glm::mat4();
		uboOffscreenVS.model = glm::translate(glm::mat4(), glm::vec3(0.0f, 0.25f, 0.0f) + cameraPos);
		uboOffscreenVS.model = glm::rotate(uboOffscreenVS.model, glm::radians(rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
		uboOffscreenVS.model = glm::rotate(uboOffscreenVS.model, glm::radians(rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
		uboOffscreenVS.model = glm::rotate(uboOffscreenVS.model, glm::radians(rotation.z), glm::vec3(0.0f, 0.0f, 1.0f));

		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);
	}

	// Update fragment shader light position uniform block
	void updateUniformBufferDeferredLights()
	{
		// White
		uboFragmentLights.lights[0].position = glm::vec4(0.0f, 0.0f, 1.0f, 0.0f);
		uboFragmentLights.lights[0].color = glm::vec3(1.5f);
		uboFragmentLights.lights[0].radius = 15.0f * 0.25f;
		// Red
		uboFragmentLights.lights[1].position = glm::vec4(-2.0f, 0.0f, 0.0f, 0.0f);
		uboFragmentLights.lights[1].color = glm::vec3(1.0f, 0.0f, 0.0f);
		uboFragmentLights.lights[1].radius = 15.0f;
		// Blue
		uboFragmentLights.lights[2].position = glm::vec4(2.0f, 1.0f, 0.0f, 0.0f);
		uboFragmentLights.lights[2].color = glm::vec3(0.0f, 0.0f, 2.5f);
		uboFragmentLights.lights[2].radius = 5.0f;
		// Yellow
		uboFragmentLights.lights[3].position = glm::vec4(0.0f, 0.9f, 0.5f, 0.0f);
		uboFragmentLights.lights[3].color = glm::vec3(1.0f, 1.0f, 0.0f);
		uboFragmentLights.lights[3].radius = 2.0f;
		// Green
		uboFragmentLights.lights[4].position = glm::vec4(0.0f, 0.5f, 0.0f, 0.0f);
		uboFragmentLights.lights[4].color = glm::vec3(0.0f, 1.0f, 0.2f);
		uboFragmentLights.lights[4].radius = 5.0f;
		// Yellow
		uboFragmentLights.lights[5].position = glm::vec4(0.0f, 1.0f, 0.0f, 0.0f);
		uboFragmentLights.lights[5].color = glm::vec3(1.0f, 0.7f, 0.3f);
		uboFragmentLights.lights[5].radius = 25.0f;

		uboFragmentLights.lights[0].position.x = sin(glm::radians(360.0f * timer)) * 5.0f;
		uboFragmentLights.lights[0].position.z = cos(glm::radians(360.0f * timer)) * 5.0f;

		uboFragmentLights.lights[1].position.x = -4.0f + sin(glm::radians(360.0f * timer) + 45.0f) * 2.0f;
		uboFragmentLights.lights[1].position.z =  0.0f + cos(glm::radians(360.0f * timer) + 45.0f) * 2.0f;

		uboFragmentLights.lights[2].position.x = 4.0f + sin(glm::radians(360.0f * timer)) * 2.0f;
		uboFragmentLights.lights[2].position.z = 0.0f + cos(glm::radians(360.0f * timer)) * 2.0f;

		uboFragmentLights.lights[4].position.x = 0.0f + sin(glm::radians(360.0f * timer + 90.0f)) * 5.0f;
		uboFragmentLights.lights[4].position.z = 0.0f - cos(glm::radians(360.0f * timer + 45.0f)) * 5.0f;

		uboFragmentLights.lights[5].position.x = 0.0f + sin(glm::radians(-360.0f * timer + 135.0f)) * 10.0f;
		uboFragmentLights.lights[5].position.z = 0.0f - cos(glm::radians(-360.0f * timer - 45.0f)) * 10.0f;

		// 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();

		// The scene render command buffer has to wait for the offscreen
		// rendering to be finished before we can use the framebuffer 
		// color image for sampling during final rendering
		// To ensure this we use a dedicated offscreen synchronization
		// semaphore that will be signaled when offscreen renderin
		// has been finished
		// This is necessary as an implementation may start both
		// command buffers at the same time, there is no guarantee
		// that command buffers will be executed in the order they
		// have been submitted by the application

		// Offscreen rendering

		// Wait for swap chain presentation to finish
		submitInfo.pWaitSemaphores = &semaphores.presentComplete;
		// Signal ready with offscreen semaphore
		submitInfo.pSignalSemaphores = &offscreenSemaphore;

		// Submit work
		submitInfo.commandBufferCount = 1;
		submitInfo.pCommandBuffers = &offScreenCmdBuffer;
		VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));

		// Scene rendering

		// Wait for offscreen semaphore
		submitInfo.pWaitSemaphores = &offscreenSemaphore;
		// Signal ready with render complete semaphpre
		submitInfo.pSignalSemaphores = &semaphores.renderComplete;

		// Submit work
		submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
		VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));

		VulkanExampleBase::submitFrame();
	}

	void prepare()
	{
		VulkanExampleBase::prepare();
		loadTextures();
		generateQuads();
		loadMeshes();
		setupVertexDescriptions();
		prepareOffscreenFramebuffer();
		prepareUniformBuffers();
		setupDescriptorSetLayout();
		preparePipelines();
		setupDescriptorPool();
		setupDescriptorSet();
		buildCommandBuffers();
		buildDeferredCommandBuffer(); 
		prepared = true;
	}

	virtual void render()
	{
		if (!prepared)
			return;
		draw();
		updateUniformBufferDeferredLights();
	}

	virtual void viewChanged()
	{
		updateUniformBufferDeferredMatrices();
	}

	void toggleDebugDisplay()
	{
		debugDisplay = !debugDisplay;
		reBuildCommandBuffers();
		updateUniformBuffersScreen();
	}

	virtual void keyPressed(uint32_t keyCode)
	{
		switch (keyCode)
		{
		case KEY_F1:
		case GAMEPAD_BUTTON_A:
			toggleDebugDisplay();
			updateTextOverlay();
			break;
		}
	}

	virtual void getOverlayText(VulkanTextOverlay *textOverlay)
	{
#if defined(__ANDROID__)
		textOverlay->addText("Press \"Button A\" to toggle debug display", 5.0f, 85.0f, VulkanTextOverlay::alignLeft);
#else
		textOverlay->addText("Press \"F1\" to toggle debug display", 5.0f, 85.0f, VulkanTextOverlay::alignLeft);
#endif
		// Render targets
		if (debugDisplay)
		{
			textOverlay->addText("World space position", (float)width * 0.25f, (float)height * 0.5f - 25.0f, VulkanTextOverlay::alignCenter);
			textOverlay->addText("World space normals", (float)width * 0.75f, (float)height * 0.5f - 25.0f, VulkanTextOverlay::alignCenter);
			textOverlay->addText("Albedo", (float)width * 0.25f, (float)height - 25.0f, VulkanTextOverlay::alignCenter);
			textOverlay->addText("Final image", (float)width * 0.75f, (float)height - 25.0f, VulkanTextOverlay::alignCenter);
		}
	}
};

VULKAN_EXAMPLE_MAIN()