/*
* Vulkan Example - Multi pass offscreen rendering (bloom)
*
* 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 256
#define TEX_FORMAT VK_FORMAT_R8G8B8A8_UNORM
#define TEX_FILTER VK_FILTER_LINEAR;

// Offscreen frame buffer properties
#define FB_DIM TEX_DIM
#define FB_COLOR_FORMAT VK_FORMAT_R8G8B8A8_UNORM

// 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
};

class VulkanExample : public VulkanExampleBase
{
public:
	bool bloom = true;

	struct {
		vkTools::VulkanTexture cubemap;
	} textures;

	struct {
		vkMeshLoader::MeshBuffer ufo;
		vkMeshLoader::MeshBuffer ufoGlow;
		vkMeshLoader::MeshBuffer skyBox;
		vkMeshLoader::MeshBuffer quad;
	} meshes;

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

	struct {
		vkTools::UniformData vsScene;
		vkTools::UniformData vsFullScreen;
		vkTools::UniformData vsSkyBox;
		vkTools::UniformData fsVertBlur;
		vkTools::UniformData fsHorzBlur;
	} uniformData;

	struct UBO {
		glm::mat4 projection;
		glm::mat4 model;
	};

	struct UBOBlur {
		int32_t texWidth = TEX_DIM;
		int32_t texHeight = TEX_DIM;
		float blurScale = 1.0f;
		float blurStrength = 1.5f;
		uint32_t horizontal;
	};

	struct {
		UBO scene, fullscreen, skyBox;
		UBOBlur vertBlur, horzBlur;
	} ubos;

	struct {
		VkPipeline blurVert;
		VkPipeline colorPass;
		VkPipeline phongPass;
		VkPipeline skyBox;
	} pipelines;

	struct {
		VkPipelineLayout radialBlur;
		VkPipelineLayout scene;
	} pipelineLayouts;

	struct {
		VkDescriptorSet scene;
		VkDescriptorSet verticalBlur;
		VkDescriptorSet horizontalBlur;
		VkDescriptorSet skyBox;
	} descriptorSets;

	// Descriptor set layout is shared amongst
	// all descriptor sets
	VkDescriptorSetLayout descriptorSetLayout;

	// Framebuffer for offscreen rendering
	struct FrameBufferAttachment {
		VkImage image;
		VkDeviceMemory mem;
		VkImageView view;
	};
	struct FrameBuffer {
		int32_t width, height;
		VkFramebuffer frameBuffer;
		FrameBufferAttachment color, depth;
	} offScreenFrameBuf, offScreenFrameBufB;

	// One sampler for the frame buffer color attachments
	VkSampler colorSampler;

	// Used to store commands for rendering and blitting
	// the offscreen scene
	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 = -10.25f;
		rotation = { 7.5f, -343.0f, 0.0f };
		timerSpeed *= 0.5f;
		enableTextOverlay = true;
		title = "Vulkan Example - Bloom";
	}

	~VulkanExample()
	{
		// Clean up used Vulkan resources 
		// Note : Inherited destructor cleans up resources stored in base class

		vkDestroySampler(device, colorSampler, nullptr);

		// Frame buffer
		vkDestroyImageView(device, offScreenFrameBuf.color.view, nullptr);
		vkDestroyImage(device, offScreenFrameBuf.color.image, nullptr);
		vkFreeMemory(device, offScreenFrameBuf.color.mem, nullptr);

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

		vkDestroyImageView(device, offScreenFrameBufB.color.view, nullptr);
		vkDestroyImage(device, offScreenFrameBufB.color.image, nullptr);
		vkFreeMemory(device, offScreenFrameBufB.color.mem, nullptr);

		vkDestroyImageView(device, offScreenFrameBufB.depth.view, nullptr);
		vkDestroyImage(device, offScreenFrameBufB.depth.image, nullptr);
		vkFreeMemory(device, offScreenFrameBufB.depth.mem, nullptr);

		vkDestroyFramebuffer(device, offScreenFrameBuf.frameBuffer, nullptr);
		vkDestroyFramebuffer(device, offScreenFrameBufB.frameBuffer, nullptr);

		vkDestroyPipeline(device, pipelines.blurVert, nullptr);
		vkDestroyPipeline(device, pipelines.phongPass, nullptr);
		vkDestroyPipeline(device, pipelines.colorPass, nullptr);
		vkDestroyPipeline(device, pipelines.skyBox, nullptr);

		vkDestroyPipelineLayout(device, pipelineLayouts.radialBlur, nullptr);
		vkDestroyPipelineLayout(device, pipelineLayouts.scene, nullptr);

		vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);

		// Meshes
		vkMeshLoader::freeMeshBufferResources(device, &meshes.ufo);
		vkMeshLoader::freeMeshBufferResources(device, &meshes.ufoGlow);
		vkMeshLoader::freeMeshBufferResources(device, &meshes.skyBox);
		vkMeshLoader::freeMeshBufferResources(device, &meshes.quad);

		// Uniform buffers
		vkTools::destroyUniformData(device, &uniformData.vsScene);
		vkTools::destroyUniformData(device, &uniformData.vsFullScreen);
		vkTools::destroyUniformData(device, &uniformData.vsSkyBox);
		vkTools::destroyUniformData(device, &uniformData.fsVertBlur);
		vkTools::destroyUniformData(device, &uniformData.fsHorzBlur);

		vkFreeCommandBuffers(device, cmdPool, 1, &offScreenCmdBuffer);
		vkDestroySemaphore(device, offscreenSemaphore, nullptr);

		textureLoader->destroyTexture(textures.cubemap);
	}

	// Setup the offscreen framebuffer for rendering the mirrored scene
	// The color attachment of this framebuffer will then be sampled from
	void prepareOffscreenFramebuffer(FrameBuffer *frameBuf, VkCommandBuffer cmdBuffer)
	{
		frameBuf->width = FB_DIM;
		frameBuf->height = FB_DIM;

		VkFormat fbColorFormat = FB_COLOR_FORMAT;

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

		// Color attachment
		VkImageCreateInfo image = vkTools::initializers::imageCreateInfo();
		image.imageType = VK_IMAGE_TYPE_2D;
		image.format = fbColorFormat;
		image.extent.width = frameBuf->width;
		image.extent.height = frameBuf->height;
		image.extent.depth = 1;
		image.mipLevels = 1;
		image.arrayLayers = 1;
		image.samples = VK_SAMPLE_COUNT_1_BIT;
		image.tiling = VK_IMAGE_TILING_OPTIMAL;
		// We will sample directly from the color attachment
		image.usage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT;

		VkMemoryAllocateInfo memAlloc = vkTools::initializers::memoryAllocateInfo();
		VkMemoryRequirements memReqs;

		VkImageViewCreateInfo colorImageView = vkTools::initializers::imageViewCreateInfo();
		colorImageView.viewType = VK_IMAGE_VIEW_TYPE_2D;
		colorImageView.format = fbColorFormat;
		colorImageView.flags = 0;
		colorImageView.subresourceRange = {};
		colorImageView.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
		colorImageView.subresourceRange.baseMipLevel = 0;
		colorImageView.subresourceRange.levelCount = 1;
		colorImageView.subresourceRange.baseArrayLayer = 0;
		colorImageView.subresourceRange.layerCount = 1;

		VK_CHECK_RESULT(vkCreateImage(device, &image, nullptr, &frameBuf->color.image));
		vkGetImageMemoryRequirements(device, frameBuf->color.image, &memReqs);
		memAlloc.allocationSize = memReqs.size;
		memAlloc.memoryTypeIndex = getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
		VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &frameBuf->color.mem));
		VK_CHECK_RESULT(vkBindImageMemory(device, frameBuf->color.image, frameBuf->color.mem, 0));

		// Set the initial layout to shader read instead of attachment 
		// This is done as the render loop does the actualy image layout transitions
		vkTools::setImageLayout(
			cmdBuffer, 
			frameBuf->color.image, 
			VK_IMAGE_ASPECT_COLOR_BIT, 
			VK_IMAGE_LAYOUT_UNDEFINED, 
			VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);

		colorImageView.image = frameBuf->color.image;
		VK_CHECK_RESULT(vkCreateImageView(device, &colorImageView, nullptr, &frameBuf->color.view));

		// Depth stencil attachment
		image.format = fbDepthFormat;
		image.usage = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;

		VkImageViewCreateInfo depthStencilView = vkTools::initializers::imageViewCreateInfo();
		depthStencilView.viewType = VK_IMAGE_VIEW_TYPE_2D;
		depthStencilView.format = fbDepthFormat;
		depthStencilView.flags = 0;
		depthStencilView.subresourceRange = {};
		depthStencilView.subresourceRange.aspectMask = VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT;
		depthStencilView.subresourceRange.baseMipLevel = 0;
		depthStencilView.subresourceRange.levelCount = 1;
		depthStencilView.subresourceRange.baseArrayLayer = 0;
		depthStencilView.subresourceRange.layerCount = 1;

		VK_CHECK_RESULT(vkCreateImage(device, &image, nullptr, &frameBuf->depth.image));
		vkGetImageMemoryRequirements(device, frameBuf->depth.image, &memReqs);
		memAlloc.allocationSize = memReqs.size;
		memAlloc.memoryTypeIndex = getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
		VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &frameBuf->depth.mem));
		VK_CHECK_RESULT(vkBindImageMemory(device, frameBuf->depth.image, frameBuf->depth.mem, 0));

		vkTools::setImageLayout(
			cmdBuffer,
			frameBuf->depth.image, 
			VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT, 
			VK_IMAGE_LAYOUT_UNDEFINED, 
			VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL);

		depthStencilView.image = frameBuf->depth.image;
		VK_CHECK_RESULT(vkCreateImageView(device, &depthStencilView, nullptr, &frameBuf->depth.view));

		VkImageView attachments[2];
		attachments[0] = frameBuf->color.view;
		attachments[1] = frameBuf->depth.view;

		VkFramebufferCreateInfo fbufCreateInfo = vkTools::initializers::framebufferCreateInfo();
		fbufCreateInfo.renderPass = renderPass;
		fbufCreateInfo.attachmentCount = 2;
		fbufCreateInfo.pAttachments = attachments;
		fbufCreateInfo.width = frameBuf->width;
		fbufCreateInfo.height = frameBuf->height;
		fbufCreateInfo.layers = 1;

		VK_CHECK_RESULT(vkCreateFramebuffer(device, &fbufCreateInfo, nullptr, &frameBuf->frameBuffer));
	}

	// Prepare the offscreen framebuffers used for the vertical- and horizontal blur 
	void prepareOffscreenFramebuffers()
	{
		VkCommandBuffer cmdBuffer = VulkanExampleBase::createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
		prepareOffscreenFramebuffer(&offScreenFrameBuf, cmdBuffer);
		prepareOffscreenFramebuffer(&offScreenFrameBufB, cmdBuffer);
		VulkanExampleBase::flushCommandBuffer(cmdBuffer, queue, true);

		// Create sampler to sample from the color attachments
		VkSamplerCreateInfo sampler = vkTools::initializers::samplerCreateInfo();
		sampler.magFilter = VK_FILTER_LINEAR;
		sampler.minFilter = VK_FILTER_LINEAR;
		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));
	}

	// Sets up the command buffer that renders the scene to the offscreen frame buffer
	// The blur method used in this example is multi pass and renders the vertical
	// blur first and then the horizontal one.
	// While it's possible to blur in one pass, this method is widely used as it
	// requires far less samples to generate the blur
	void buildOffscreenCommandBuffer()
	{
		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();

		// First pass: Horizontal blur

		VkClearValue clearValues[2];
		clearValues[0].color = { { 0.0f, 0.0f, 0.0f, 1.0f } };
		clearValues[1].depthStencil = { 1.0f, 0 };

		VkRenderPassBeginInfo renderPassBeginInfo = vkTools::initializers::renderPassBeginInfo();
		renderPassBeginInfo.renderPass = renderPass;
		renderPassBeginInfo.framebuffer = offScreenFrameBuf.frameBuffer;
		renderPassBeginInfo.renderArea.extent.width = offScreenFrameBuf.width;
		renderPassBeginInfo.renderArea.extent.height = offScreenFrameBuf.height;
		renderPassBeginInfo.clearValueCount = 2;
		renderPassBeginInfo.pClearValues = clearValues;

		VK_CHECK_RESULT(vkBeginCommandBuffer(offScreenCmdBuffer, &cmdBufInfo));

		// Change back layout of the color attachment after sampling in the fragment shader
		vkTools::setImageLayout(
			offScreenCmdBuffer,
			offScreenFrameBuf.color.image,
			VK_IMAGE_ASPECT_COLOR_BIT,
			VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);

		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);

		vkCmdBeginRenderPass(offScreenCmdBuffer, &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);

		vkCmdBindDescriptorSets(offScreenCmdBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.scene, 0, 1, &descriptorSets.scene, 0, NULL);
		vkCmdBindPipeline(offScreenCmdBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.phongPass);

		VkDeviceSize offsets[1] = { 0 };
		vkCmdBindVertexBuffers(offScreenCmdBuffer, VERTEX_BUFFER_BIND_ID, 1, &meshes.ufoGlow.vertices.buf, offsets);
		vkCmdBindIndexBuffer(offScreenCmdBuffer, meshes.ufoGlow.indices.buf, 0, VK_INDEX_TYPE_UINT32);
		vkCmdDrawIndexed(offScreenCmdBuffer, meshes.ufoGlow.indexCount, 1, 0, 0, 0);

		vkCmdEndRenderPass(offScreenCmdBuffer);

		// Change layout of the color attachment for sampling in the fragment shader 
		// in the vertical blur pass
		vkTools::setImageLayout(
			offScreenCmdBuffer,
			offScreenFrameBuf.color.image,
			VK_IMAGE_ASPECT_COLOR_BIT,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
			VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);

		// Second pass: Vertical blur

		// Render the horizontally blurred texture into a second
		// framebuffer and blur vertically

		renderPassBeginInfo.framebuffer = offScreenFrameBufB.frameBuffer;
		renderPassBeginInfo.renderArea.extent.width = offScreenFrameBufB.width;
		renderPassBeginInfo.renderArea.extent.height = offScreenFrameBufB.height;

		viewport.width = offScreenFrameBuf.width;
		viewport.height = offScreenFrameBuf.height;
		vkCmdSetViewport(offScreenCmdBuffer, 0, 1, &viewport);

		vkCmdSetScissor(offScreenCmdBuffer, 0, 1, &scissor);

		// Change back layout of the color attachment after sampling in the fragment shader
		vkTools::setImageLayout(
			offScreenCmdBuffer,
			offScreenFrameBufB.color.image,
			VK_IMAGE_ASPECT_COLOR_BIT,
			VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);

		vkCmdBeginRenderPass(offScreenCmdBuffer, &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);

		// Draw horizontally blurred texture 
		vkCmdBindDescriptorSets(offScreenCmdBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.radialBlur, 0, 1, &descriptorSets.verticalBlur, 0, NULL);
		vkCmdBindPipeline(offScreenCmdBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.blurVert);
		vkCmdBindVertexBuffers(offScreenCmdBuffer, VERTEX_BUFFER_BIND_ID, 1, &meshes.quad.vertices.buf, offsets);
		vkCmdBindIndexBuffer(offScreenCmdBuffer, meshes.quad.indices.buf, 0, VK_INDEX_TYPE_UINT32);
		vkCmdDrawIndexed(offScreenCmdBuffer, meshes.quad.indexCount, 1, 0, 0, 0);

		vkCmdEndRenderPass(offScreenCmdBuffer);

		// Change layout of the color attachment for sampling in the fragment shader 
		// in the vertical blur pass
		vkTools::setImageLayout(
			offScreenCmdBuffer,
			offScreenFrameBufB.color.image,
			VK_IMAGE_ASPECT_COLOR_BIT,
			VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
			VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);

		VK_CHECK_RESULT(vkEndCommandBuffer(offScreenCmdBuffer));
	}

	void loadTextures()
	{
		textureLoader->loadCubemap(
			getAssetPath() + "textures/cubemap_space.ktx",
			VK_FORMAT_R8G8B8A8_UNORM,
			&textures.cubemap);
	}

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

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

		VkClearValue clearValues[2];
		clearValues[0].color = defaultClearColor;
		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 };

			// Skybox 
			vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.scene, 0, 1, &descriptorSets.skyBox, 0, NULL);
			vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.skyBox);

			vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &meshes.skyBox.vertices.buf, offsets);
			vkCmdBindIndexBuffer(drawCmdBuffers[i], meshes.skyBox.indices.buf, 0, VK_INDEX_TYPE_UINT32);
			vkCmdDrawIndexed(drawCmdBuffers[i], meshes.skyBox.indexCount, 1, 0, 0, 0);

			// 3D scene
			vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.scene, 0, 1, &descriptorSets.scene, 0, NULL);
			vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.phongPass);

			vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &meshes.ufo.vertices.buf, offsets);
			vkCmdBindIndexBuffer(drawCmdBuffers[i], meshes.ufo.indices.buf, 0, VK_INDEX_TYPE_UINT32);
			vkCmdDrawIndexed(drawCmdBuffers[i], meshes.ufo.indexCount, 1, 0, 0, 0);

			// Render vertical blurred scene applying a horizontal blur
			if (bloom)
			{
				vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.radialBlur, 0, 1, &descriptorSets.horizontalBlur, 0, NULL);
				vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.blurVert);
				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, 0);
			}

			vkCmdEndRenderPass(drawCmdBuffers[i]);

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

		if (bloom) 
		{
			buildOffscreenCommandBuffer();
		}
	}

	void loadMeshes()
	{
		loadMesh(getAssetPath() + "models/retroufo.dae", &meshes.ufo, vertexLayout, 0.05f);
		loadMesh(getAssetPath() + "models/retroufo_glow.dae", &meshes.ufoGlow, vertexLayout, 0.05f);
		loadMesh(getAssetPath() + "models/cube.obj", &meshes.skyBox, vertexLayout, 1.0f);
	}

	// Setup vertices for a single uv-mapped quad
	void generateQuad()
	{
		struct Vertex {
			float pos[3];
			float uv[2];
			float col[3];
			float normal[3];
		};

#define QUAD_COLOR_NORMAL { 1.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, 1.0f }
		std::vector<Vertex> vertexBuffer =
		{
			{ { 1.0f, 1.0f, 0.0f },{ 1.0f, 1.0f }, QUAD_COLOR_NORMAL },
			{ { 0.0f, 1.0f, 0.0f },{ 0.0f, 1.0f }, QUAD_COLOR_NORMAL },
			{ { 0.0f, 0.0f, 0.0f },{ 0.0f, 0.0f }, QUAD_COLOR_NORMAL },
			{ { 1.0f, 0.0f, 0.0f },{ 1.0f, 0.0f }, QUAD_COLOR_NORMAL }
		};
#undef QUAD_COLOR_NORMAL

		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 };
		meshes.quad.indexCount = 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
		// Same for all meshes used in this example
		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(4);
		// 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);

		vertices.inputState = vkTools::initializers::pipelineVertexInputStateCreateInfo();
		vertices.inputState.vertexBindingDescriptionCount = vertices.bindingDescriptions.size();
		vertices.inputState.pVertexBindingDescriptions = vertices.bindingDescriptions.data();
		vertices.inputState.vertexAttributeDescriptionCount = 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, 6)
		};

		VkDescriptorPoolCreateInfo descriptorPoolInfo =
			vkTools::initializers::descriptorPoolCreateInfo(
				poolSizes.size(),
				poolSizes.data(),
				5);

		VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
	}

	void setupDescriptorSetLayout()
	{
		// Textured quad pipeline 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 : Fragment shader image sampler
			vkTools::initializers::descriptorSetLayoutBinding(
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				VK_SHADER_STAGE_FRAGMENT_BIT,
				1),
			// Binding 2 : Framgnet shader image sampler
			vkTools::initializers::descriptorSetLayoutBinding(
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				VK_SHADER_STAGE_FRAGMENT_BIT,
				2),
		};

		VkDescriptorSetLayoutCreateInfo descriptorLayout =
			vkTools::initializers::descriptorSetLayoutCreateInfo(
				setLayoutBindings.data(),
				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.radialBlur));

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

	void setupDescriptorSet()
	{
		VkDescriptorSetAllocateInfo allocInfo =
			vkTools::initializers::descriptorSetAllocateInfo(
				descriptorPool,
				&descriptorSetLayout,
				1);

		// Full screen blur descriptor sets

		// Vertical blur
		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.verticalBlur));

		// Texture descriptor for sampling from the unblurred offscreen color attachment
		VkDescriptorImageInfo texDescriptorVert =
			vkTools::initializers::descriptorImageInfo(
				colorSampler,
				offScreenFrameBuf.color.view,
				VK_IMAGE_LAYOUT_GENERAL);

		std::vector<VkWriteDescriptorSet> writeDescriptorSets =
		{
			// Binding 0 : Vertex shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.verticalBlur,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				0,
				&uniformData.vsScene.descriptor),
			// Binding 1 : Fragment shader texture sampler
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.verticalBlur,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				1,
				&texDescriptorVert),
			// Binding 2 : Fragment shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.verticalBlur,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				2,
				&uniformData.fsVertBlur.descriptor)
		};

		vkUpdateDescriptorSets(device, writeDescriptorSets.size(), writeDescriptorSets.data(), 0, NULL);

		// Horizontal blur
		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.horizontalBlur));

		// Texture descriptor for sampling from the vertically blurred offscreen color attachment
		VkDescriptorImageInfo texDescriptorHorz =
			vkTools::initializers::descriptorImageInfo(
				colorSampler,
				offScreenFrameBufB.color.view,
				VK_IMAGE_LAYOUT_GENERAL);

		writeDescriptorSets =
		{
			// Binding 0 : Vertex shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.horizontalBlur,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				0,
				&uniformData.vsScene.descriptor),
			// Binding 1 : Fragment shader texture sampler
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.horizontalBlur,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				1,
				&texDescriptorHorz),
			// Binding 2 : Fragment shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.horizontalBlur,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				2,
				&uniformData.fsHorzBlur.descriptor)
		};

		vkUpdateDescriptorSets(device, writeDescriptorSets.size(), writeDescriptorSets.data(), 0, NULL);

		// 3D scene
		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.vsFullScreen.descriptor)
		};

		vkUpdateDescriptorSets(device, writeDescriptorSets.size(), writeDescriptorSets.data(), 0, NULL);

		// Skybox
		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.skyBox));

		// Image descriptor for the cube map texture
		VkDescriptorImageInfo cubeMapDescriptor =
			vkTools::initializers::descriptorImageInfo(
				textures.cubemap.sampler,
				textures.cubemap.view,
				VK_IMAGE_LAYOUT_GENERAL);

		writeDescriptorSets =
		{
			// Binding 0 : Vertex shader uniform buffer
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.skyBox,
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				0,
				&uniformData.vsSkyBox.descriptor),
			// Binding 1 : Fragment shader texture sampler
			vkTools::initializers::writeDescriptorSet(
				descriptorSets.skyBox,
				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
				1,
				&cubeMapDescriptor),
		};

		vkUpdateDescriptorSets(device, 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_NONE,
				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(),
				dynamicStateEnables.size(),
				0);

		std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages;

		// Vertical gauss blur
		// Load shaders
		shaderStages[0] = loadShader(getAssetPath() + "shaders/bloom/gaussblur.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/bloom/gaussblur.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);

		VkGraphicsPipelineCreateInfo pipelineCreateInfo =
			vkTools::initializers::pipelineCreateInfo(
				pipelineLayouts.radialBlur,
				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 = shaderStages.size();
		pipelineCreateInfo.pStages = shaderStages.data();

		// Additive blending
		blendAttachmentState.colorWriteMask = 0xF;
		blendAttachmentState.blendEnable = VK_TRUE;
		blendAttachmentState.colorBlendOp = VK_BLEND_OP_ADD;
		blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
		blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE;
		blendAttachmentState.alphaBlendOp = VK_BLEND_OP_ADD;
		blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
		blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_DST_ALPHA;

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

		// Phong pass (3D model)
		shaderStages[0] = loadShader(getAssetPath() + "shaders/bloom/phongpass.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/bloom/phongpass.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
		pipelineCreateInfo.layout = pipelineLayouts.scene;
		blendAttachmentState.blendEnable = VK_FALSE;
		depthStencilState.depthWriteEnable = VK_TRUE;
		rasterizationState.cullMode = VK_CULL_MODE_BACK_BIT;
		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.phongPass));

		// Color only pass (offscreen blur base)
		shaderStages[0] = loadShader(getAssetPath() + "shaders/bloom/colorpass.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/bloom/colorpass.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.colorPass));

		// Skybox (cubemap)
		shaderStages[0] = loadShader(getAssetPath() + "shaders/bloom/skybox.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/bloom/skybox.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
		depthStencilState.depthWriteEnable = VK_FALSE;
		rasterizationState.cullMode = VK_CULL_MODE_FRONT_BIT;
		VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.skyBox));
	}

	// Prepare and initialize uniform buffer containing shader uniforms
	void prepareUniformBuffers()
	{
		// Phong and color pass vertex shader uniform buffer
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
			sizeof(ubos.scene),
			&ubos.scene,
			&uniformData.vsScene.buffer,
			&uniformData.vsScene.memory,
			&uniformData.vsScene.descriptor);

		// Fullscreen quad display vertex shader uniform buffer
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
			sizeof(ubos.fullscreen),
			&ubos.fullscreen,
			&uniformData.vsFullScreen.buffer,
			&uniformData.vsFullScreen.memory,
			&uniformData.vsFullScreen.descriptor);

		// Fullscreen quad fragment shader uniform buffers
		// Vertical blur
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
			sizeof(ubos.vertBlur),
			&ubos.vertBlur,
			&uniformData.fsVertBlur.buffer,
			&uniformData.fsVertBlur.memory,
			&uniformData.fsVertBlur.descriptor);
		// Horizontal blur
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
			sizeof(ubos.horzBlur),
			&ubos.horzBlur,
			&uniformData.fsHorzBlur.buffer,
			&uniformData.fsHorzBlur.memory,
			&uniformData.fsHorzBlur.descriptor);

		// Skybox
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
			sizeof(ubos.skyBox),
			&ubos.skyBox,
			&uniformData.vsSkyBox.buffer,
			&uniformData.vsSkyBox.memory,
			&uniformData.vsSkyBox.descriptor);

		// Intialize uniform buffers
		updateUniformBuffersScene();
		updateUniformBuffersScreen();
	}

	// Update uniform buffers for rendering the 3D scene
	void updateUniformBuffersScene()
	{
		// UFO
		ubos.fullscreen.projection = glm::perspective(glm::radians(45.0f), (float)width / (float)height, 0.1f, 256.0f);
		glm::mat4 viewMatrix = glm::translate(glm::mat4(), glm::vec3(0.0f, -1.0f, zoom));

		ubos.fullscreen.model = viewMatrix *
			glm::translate(glm::mat4(), glm::vec3(sin(glm::radians(timer * 360.0f)) * 0.25f, 0.0f, cos(glm::radians(timer * 360.0f)) * 0.25f) + cameraPos);

		ubos.fullscreen.model = glm::rotate(ubos.fullscreen.model, glm::radians(rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
		ubos.fullscreen.model = glm::rotate(ubos.fullscreen.model, -sinf(glm::radians(timer * 360.0f)) * 0.15f, glm::vec3(1.0f, 0.0f, 0.0f));
		ubos.fullscreen.model = glm::rotate(ubos.fullscreen.model, glm::radians(rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
		ubos.fullscreen.model = glm::rotate(ubos.fullscreen.model, glm::radians(timer * 360.0f), glm::vec3(0.0f, 1.0f, 0.0f));
		ubos.fullscreen.model = glm::rotate(ubos.fullscreen.model, glm::radians(rotation.z), glm::vec3(0.0f, 0.0f, 1.0f));

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

		// Skybox
		ubos.skyBox.projection = glm::perspective(glm::radians(45.0f), (float)width / (float)height, 0.1f, 256.0f);

		ubos.skyBox.model = glm::mat4();
		ubos.skyBox.model = glm::rotate(ubos.skyBox.model, glm::radians(rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
		ubos.skyBox.model = glm::rotate(ubos.skyBox.model, glm::radians(rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
		ubos.skyBox.model = glm::rotate(ubos.skyBox.model, glm::radians(rotation.z), glm::vec3(0.0f, 0.0f, 1.0f));

		VK_CHECK_RESULT(vkMapMemory(device, uniformData.vsSkyBox.memory, 0, sizeof(ubos.skyBox), 0, (void **)&pData));
		memcpy(pData, &ubos.skyBox, sizeof(ubos.skyBox));
		vkUnmapMemory(device, uniformData.vsSkyBox.memory);
	}

	// Update uniform buffers for the fullscreen quad
	void updateUniformBuffersScreen()
	{
		// Vertex shader
		ubos.scene.projection = glm::ortho(0.0f, 1.0f, 0.0f, 1.0f, -1.0f, 1.0f);
		ubos.scene.model = glm::mat4();

		uint8_t *pData;
		VK_CHECK_RESULT(vkMapMemory(device, uniformData.vsScene.memory, 0, sizeof(ubos.scene), 0, (void **)&pData));
		memcpy(pData, &ubos.scene, sizeof(ubos.scene));
		vkUnmapMemory(device, uniformData.vsScene.memory);

		// Fragment shader
		// Vertical
		ubos.vertBlur.horizontal = 0;
		VK_CHECK_RESULT(vkMapMemory(device, uniformData.fsVertBlur.memory, 0, sizeof(ubos.vertBlur), 0, (void **)&pData));
		memcpy(pData, &ubos.vertBlur, sizeof(ubos.vertBlur));
		vkUnmapMemory(device, uniformData.fsVertBlur.memory);
		// Horizontal
		ubos.horzBlur.horizontal = 1;
		VK_CHECK_RESULT(vkMapMemory(device, uniformData.fsHorzBlur.memory, 0, sizeof(ubos.horzBlur), 0, (void **)&pData));
		memcpy(pData, &ubos.horzBlur, sizeof(ubos.horzBlur));
		vkUnmapMemory(device, uniformData.fsHorzBlur.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();
		generateQuad();
		loadMeshes();
		setupVertexDescriptions();
		prepareUniformBuffers();
		prepareOffscreenFramebuffers();
		setupDescriptorSetLayout();
		preparePipelines();
		setupDescriptorPool();
		setupDescriptorSet();
		buildCommandBuffers();
		prepared = true;
	}

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

	virtual void viewChanged()
	{
		updateUniformBuffersScene();
		updateUniformBuffersScreen();
	}

	virtual void keyPressed(uint32_t keyCode)
	{
		switch (keyCode)
		{
		case 0x6B:
		case GAMEPAD_BUTTON_R1:
			changeBlurScale(0.25f);
			break;
		case 0x6D:
		case GAMEPAD_BUTTON_L1:
			changeBlurScale(-0.25f);
			break;
		case 0x42:
		case GAMEPAD_BUTTON_A:
			toggleBloom();
			break;
		}
	}

	virtual void getOverlayText(VulkanTextOverlay *textOverlay)
	{
#if defined(__ANDROID__)
		textOverlay->addText("Press \"L1/R1\" to change blur scale", 5.0f, 85.0f, VulkanTextOverlay::alignLeft);
		textOverlay->addText("Press \"Button A\" to toggle bloom", 5.0f, 105.0f, VulkanTextOverlay::alignLeft);
#else
		textOverlay->addText("Press \"NUMPAD +/-\" to change blur scale", 5.0f, 85.0f, VulkanTextOverlay::alignLeft);
		textOverlay->addText("Press \"B\" to toggle bloom", 5.0f, 105.0f, VulkanTextOverlay::alignLeft);
#endif
	}

	void changeBlurScale(float delta)
	{
		ubos.vertBlur.blurScale += delta;
		ubos.horzBlur.blurScale += delta;
		updateUniformBuffersScreen();
	}

	void toggleBloom()
	{
		bloom = !bloom;
		reBuildCommandBuffers();
	}
};

VulkanExample *vulkanExample;

#if defined(_WIN32)
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	if (vulkanExample != NULL)
	{
		vulkanExample->handleMessages(hWnd, uMsg, wParam, lParam);
	}
	return (DefWindowProc(hWnd, uMsg, wParam, lParam));
}
#elif defined(__linux__) && !defined(__ANDROID__)
static void handleEvent(const xcb_generic_event_t *event)
{
	if (vulkanExample != NULL)
	{
		vulkanExample->handleEvent(event);
	}
}
#endif

// Main entry point
#if defined(_WIN32)
// Windows entry point
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR pCmdLine, int nCmdShow)
#elif defined(__ANDROID__)
// Android entry point
void android_main(android_app* state)
#elif defined(__linux__)
// Linux entry point
int main(const int argc, const char *argv[])
#endif
{
#if defined(__ANDROID__)
	// Removing this may cause the compiler to omit the main entry point 
	// which would make the application crash at start
	app_dummy();
#endif
	vulkanExample = new VulkanExample();
#if defined(_WIN32)
	vulkanExample->setupWindow(hInstance, WndProc);
#elif defined(__ANDROID__)
	// Attach vulkan example to global android application state
	state->userData = vulkanExample;
	state->onAppCmd = VulkanExample::handleAppCommand;
	state->onInputEvent = VulkanExample::handleAppInput;
	vulkanExample->androidApp = state;
#elif defined(__linux__)
	vulkanExample->setupWindow();
#endif
#if !defined(__ANDROID__)
	vulkanExample->initSwapchain();
	vulkanExample->prepare();
#endif
	vulkanExample->renderLoop();
	delete(vulkanExample);
#if !defined(__ANDROID__)
	return 0;
#endif
}