/*
* Vulkan Example - Font rendering using signed distance fields
*
* Font generated using https://github.com/libgdx/libgdx/wiki/Hiero
*
* 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 <sstream>
#include <assert.h>
#include <vector>
#include <array>

#define GLM_FORCE_RADIANS
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>

#include <vulkan/vulkan.h>
#include "vulkanexamplebase.h"

#define VERTEX_BUFFER_BIND_ID 0
//#define USE_GLSL
#define ENABLE_VALIDATION false

// Vertex layout for this example
struct Vertex {
	float pos[3];
	float uv[2];
};

// AngelCode .fnt format structs and classes
struct bmchar {
	uint32_t x, y;
	uint32_t width;
	uint32_t height;
	int32_t xoffset;
	int32_t yoffset;
	int32_t xadvance;
	uint32_t page;
};

// Quick and dirty : complete ASCII table
// Only chars present in the .fnt are filled with data!
std::array<bmchar, 255> fontChars;

int32_t nextValuePair(std::stringstream *stream)
{
	std::string pair;
	*stream >> pair;
	uint32_t spos = pair.find("=");
	std::string value = pair.substr(spos + 1);
	int32_t val = std::stoi(value);
	return val;
}

void parsebmFont()
{
	const char *filename = "../data/font.fnt";

	std::ifstream fstream(filename);
	assert(fstream.good());

	// todo : from texture
	const uint32_t texdim = 512;

	while (!fstream.eof())
	{
		std::string line;
		std::stringstream lineStream;
		std::getline(fstream, line);
		lineStream << line;

		std::string info;
		lineStream >> info;

		if (info == "char")
		{
			std::string pair;

			// char id
			uint32_t charid = nextValuePair(&lineStream);
			// Char properties
			fontChars[charid].x = nextValuePair(&lineStream);
			fontChars[charid].y = nextValuePair(&lineStream);
			fontChars[charid].width = nextValuePair(&lineStream);
			fontChars[charid].height = nextValuePair(&lineStream);
			fontChars[charid].xoffset = nextValuePair(&lineStream);
			fontChars[charid].yoffset = nextValuePair(&lineStream);
			fontChars[charid].xadvance = nextValuePair(&lineStream);
			fontChars[charid].page = nextValuePair(&lineStream);
		}
	}

}

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

	struct {
		vkTools::VulkanTexture fontSDF;
		vkTools::VulkanTexture fontBitmap;
	} textures;

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

	struct {
		int count;
		VkBuffer buf;
		VkDeviceMemory mem;
	} indices;

	struct {
		vkTools::UniformData vs;
		vkTools::UniformData fs;
	} uniformData;

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

	struct {
		glm::vec4 outlineColor = glm::vec4(1.0f, 0.0f, 0.0f, 0.0f);
		float outlineWidth = 0.6f;
		float outline = true;
	} uboFS;

	struct {
		VkPipeline sdf;
		VkPipeline bitmap;
	} pipelines;

	struct {
		VkDescriptorSet sdf;
		VkDescriptorSet bitmap;
	} descriptorSets;

	VkPipelineLayout pipelineLayout;
	VkDescriptorSetLayout descriptorSetLayout;

	VulkanExample() : VulkanExampleBase(ENABLE_VALIDATION)
	{
		zoom = -1.0f;
		rotation = { 0.0f, 0.0f, 0.0f };
		title = "Vulkan Example - Distance field fonts";
	}

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

		// Clean up texture resources
		textureLoader->destroyTexture(textures.fontSDF);
		textureLoader->destroyTexture(textures.fontBitmap);

		vkDestroyPipeline(device, pipelines.sdf, nullptr);

		vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
		vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);

		vkDestroyBuffer(device, vertices.buf, nullptr);
		vkFreeMemory(device, vertices.mem, nullptr);

		vkDestroyBuffer(device, indices.buf, nullptr);
		vkFreeMemory(device, indices.mem, nullptr);

		vkDestroyBuffer(device, uniformData.vs.buffer, nullptr);
		vkFreeMemory(device, uniformData.vs.memory, nullptr);
	}

	void loadTextures()
	{
		textureLoader->loadTexture(
			"./../data/textures/font_sdf_rgba.ktx",
			VK_FORMAT_R8G8B8A8_UNORM,
			&textures.fontSDF);
		textureLoader->loadTexture(
			"./../data/textures/font_bitmap_rgba.ktx",
			VK_FORMAT_R8G8B8A8_UNORM,
			&textures.fontBitmap);
	}

	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;

		VkResult err;

		for (int32_t i = 0; i < drawCmdBuffers.size(); ++i)
		{
			// Set target frame buffer
			renderPassBeginInfo.framebuffer = frameBuffers[i];

			err = vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo);
			assert(!err);

			vkCmdBeginRenderPass(drawCmdBuffers[i], &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);

			VkViewport viewport = vkTools::initializers::viewport(
				(float)width,
				(splitScreen) ? (float)height / 2.0f : (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 };

			// Signed distance field font
			vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.sdf, 0, NULL);
			vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.sdf);
			vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &vertices.buf, offsets);
			vkCmdBindIndexBuffer(drawCmdBuffers[i], indices.buf, 0, VK_INDEX_TYPE_UINT32);
			vkCmdDrawIndexed(drawCmdBuffers[i], indices.count, 1, 0, 0, 0);

			// Linear filtered bitmap font
			if (splitScreen)
			{
				viewport.y = (float)height / 2.0f;
//				viewport.x = (float)width / 2.0f;
				vkCmdSetViewport(drawCmdBuffers[i], 0, 1, &viewport);
				vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.bitmap, 0, NULL);
				vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.bitmap);
				vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &vertices.buf, offsets);
				vkCmdBindIndexBuffer(drawCmdBuffers[i], indices.buf, 0, VK_INDEX_TYPE_UINT32);
				vkCmdDrawIndexed(drawCmdBuffers[i], indices.count, 1, 0, 0, 0);
			}


			vkCmdEndRenderPass(drawCmdBuffers[i]);

			VkImageMemoryBarrier prePresentBarrier = vkTools::prePresentBarrier(swapChain.buffers[i].image);
			vkCmdPipelineBarrier(
				drawCmdBuffers[i],
				VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
				VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
				VK_FLAGS_NONE, 
				0, nullptr,
				0, nullptr,
				1, &prePresentBarrier);

			err = vkEndCommandBuffer(drawCmdBuffers[i]);
			assert(!err);
		}
	}

	void draw()
	{
		VkResult err;
		VkSemaphore presentCompleteSemaphore;
		VkSemaphoreCreateInfo presentCompleteSemaphoreCreateInfo = 
			vkTools::initializers::semaphoreCreateInfo(VK_FENCE_CREATE_SIGNALED_BIT);

		err = vkCreateSemaphore(device, &presentCompleteSemaphoreCreateInfo, nullptr, &presentCompleteSemaphore);
		assert(!err);

		// Get next image in the swap chain (back/front buffer)
		err = swapChain.acquireNextImage(presentCompleteSemaphore, &currentBuffer);
		assert(!err);

		VkSubmitInfo submitInfo = vkTools::initializers::submitInfo();
		submitInfo.waitSemaphoreCount = 1;
		submitInfo.pWaitSemaphores = &presentCompleteSemaphore;
		submitInfo.commandBufferCount = 1;
		submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];

		// Submit draw command buffer
		err = vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE);
		assert(!err);

		err = swapChain.queuePresent(queue, currentBuffer);
		assert(!err);

		vkDestroySemaphore(device, presentCompleteSemaphore, nullptr);

		submitPostPresentBarrier(swapChain.buffers[currentBuffer].image);

		err = vkQueueWaitIdle(queue);
		assert(!err);
	}

	// todo : function fill buffer with quads from font

	void generateQuad()
	{
		// Setup vertices for a single uv-mapped quad
		/*
#define dim 1.0f
		std::vector<Vertex> vertexBuffer =
		{
			{ { dim,  dim, 0.0f },{ 1.0f, 1.0f } },
			{ { -dim,  dim, 0.0f },{ 0.0f, 1.0f } },
			{ { -dim, -dim, 0.0f },{ 0.0f, 0.0f } },
			{ { dim, -dim, 0.0f },{ 1.0f, 0.0f } }
		};
#undef dim
*/
		std::vector<Vertex> vertexBuffer;
		std::vector<uint32_t> indexBuffer;
		uint32_t indexOffset = 0;

		std::string text = "Vulkan";

		float w = textures.fontSDF.width;

		float posx = 0.0f;
		float posy = 0.0f;

		for (uint32_t i = 0; i < text.size(); i++)
		{
			bmchar *charInfo = &fontChars[(int)text[i]];

			if (charInfo->width == 0)
				charInfo->width = 36;

			float charw = ((float)(charInfo->width) / 36.0f);
			float dimx = 1.0f * charw;
			float charh = ((float)(charInfo->height) / 36.0f);
			float dimy = 1.0f * charh;
			posy = 1.0f - charh;

			float us = charInfo->x / w;
			float ue = (charInfo->x + charInfo->width) / w;
			float ts = charInfo->y / w;
			float te = (charInfo->y + charInfo->height) / w;

			float xo = charInfo->xoffset / 36.0f;
			float yo = charInfo->yoffset / 36.0f;

			vertexBuffer.push_back({ { posx + dimx + xo,  posy + dimy, 0.0f }, { ue, te } });
			vertexBuffer.push_back({ { posx + xo,         posy + dimy, 0.0f }, { us, te } });
			vertexBuffer.push_back({ { posx + xo,         posy,        0.0f }, { us, ts } });
			vertexBuffer.push_back({ { posx + dimx + xo,  posy,        0.0f }, { ue, ts } });

			std::array<uint32_t, 6> indices = { 0,1,2, 2,3,0 };
			for (auto& index : indices)
			{
				indexBuffer.push_back(indexOffset + index);
			}
			indexOffset += 4;

			float advance = ((float)(charInfo->xadvance) / 36.0f);
			posx += advance;
		}

		// Center
		for (auto& v : vertexBuffer)
		{
			v.pos[0] -= posx / 2.0f;
			v.pos[1] -= 0.5f;
		}

		/*
#define dim 1.0f
		int charId = 'V';
		float w = textures.fontSDF.width;
		float sstart = fontChars[charId].x / w;
		float send = (fontChars[charId].x + fontChars[charId].width) / w;
		float tstart = fontChars[charId].y / w;
		float tend = (fontChars[charId].y + fontChars[charId].height) / w;
		std::vector<Vertex> vertexBuffer =
		{
			{ {  dim,  dim, 0.0f },{ send, tend } },
			{ { -dim,  dim, 0.0f },{ sstart, tend } },
			{ { -dim, -dim, 0.0f },{ sstart, tstart } },
			{ {  dim, -dim, 0.0f },{ send, tstart } }
		};
#undef dim
*/
		createBuffer(
			VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
			vertexBuffer.size() * sizeof(Vertex),
			vertexBuffer.data(),
			&vertices.buf,
			&vertices.mem);

		// Setup indices
	//	std::vector<uint32_t> indexBuffer = { 0,1,2, 2,3,0 };
		indices.count = indexBuffer.size();

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

	void setupVertexDescriptions()
	{
		// Binding description
		vertices.bindingDescriptions.resize(1);
		vertices.bindingDescriptions[0] =
			vkTools::initializers::vertexInputBindingDescription(
				VERTEX_BUFFER_BIND_ID, 
				sizeof(Vertex), 
				VK_VERTEX_INPUT_RATE_VERTEX);

		// Attribute descriptions
		// Describes memory layout and shader positions
		vertices.attributeDescriptions.resize(2);
		// 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);

		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, 4),
			vkTools::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2)
		};

		VkDescriptorPoolCreateInfo descriptorPoolInfo = 
			vkTools::initializers::descriptorPoolCreateInfo(
				poolSizes.size(),
				poolSizes.data(),
				2);

		VkResult vkRes = vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool);
		assert(!vkRes);
	}

	void setupDescriptorSetLayout()
	{
		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 : Fragment shader uniform buffer
			vkTools::initializers::descriptorSetLayoutBinding(
				VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
				VK_SHADER_STAGE_FRAGMENT_BIT,
				2)
		};

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

		VkResult err = vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayout);
		assert(!err);

		VkPipelineLayoutCreateInfo pPipelineLayoutCreateInfo =
			vkTools::initializers::pipelineLayoutCreateInfo(
				&descriptorSetLayout,
				1);

		err = vkCreatePipelineLayout(device, &pPipelineLayoutCreateInfo, nullptr, &pipelineLayout);
		assert(!err);
	}

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

		// Signed distance front descriptor set
		VkResult vkRes = vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.sdf);
		assert(!vkRes);

		// Image descriptor for the color map texture
		VkDescriptorImageInfo texDescriptor =
			vkTools::initializers::descriptorImageInfo(
				textures.fontSDF.sampler,
				textures.fontSDF.view,
				VK_IMAGE_LAYOUT_GENERAL);

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

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

		// Default font rendering descriptor set
		vkRes = vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.bitmap);
		assert(!vkRes);

		// Image descriptor for the color map texture
		texDescriptor.sampler = textures.fontBitmap.sampler;
		texDescriptor.imageView = textures.fontBitmap.view;

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

		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_COUNTER_CLOCKWISE,
				0);

		VkPipelineColorBlendAttachmentState blendAttachmentState =
			vkTools::initializers::pipelineColorBlendAttachmentState(
				0xf,
				VK_TRUE);

		blendAttachmentState.colorBlendOp = VK_BLEND_OP_ADD;
		blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_SRC_COLOR;
		blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR;
		blendAttachmentState.alphaBlendOp = VK_BLEND_OP_ADD;
		blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
		blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;

		VkPipelineColorBlendStateCreateInfo colorBlendState =
			vkTools::initializers::pipelineColorBlendStateCreateInfo(
				1, 
				&blendAttachmentState);

		VkPipelineDepthStencilStateCreateInfo depthStencilState =
			vkTools::initializers::pipelineDepthStencilStateCreateInfo(
				VK_FALSE,
				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);

		// Load shaders
		std::array<VkPipelineShaderStageCreateInfo,2> shaderStages;

#ifdef USE_GLSL
		shaderStages[0] = loadShaderGLSL("./../data/shaders/distancefieldfonts/sdf.vert", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShaderGLSL("./../data/shaders/distancefieldfonts/sdf.frag", VK_SHADER_STAGE_FRAGMENT_BIT);
#else
		shaderStages[0] = loadShader("./../data/shaders/distancefieldfonts/sdf.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader("./../data/shaders/distancefieldfonts/sdf.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
#endif

		VkGraphicsPipelineCreateInfo pipelineCreateInfo =
			vkTools::initializers::pipelineCreateInfo(
				pipelineLayout,
				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();

		VkResult err = vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.sdf);
		assert(!err);

		// Default bitmap font rendering pipeline
#ifdef USE_GLSL
		shaderStages[0] = loadShaderGLSL("./../data/shaders/distancefieldfonts/bitmap.vert", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShaderGLSL("./../data/shaders/distancefieldfonts/bitmap.frag", VK_SHADER_STAGE_FRAGMENT_BIT);
#else
		shaderStages[0] = loadShader("./../data/shaders/distancefieldfonts/bitmap.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader("./../data/shaders/distancefieldfonts/bitmap.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
#endif
		err = vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.bitmap);
		assert(!err);

	}

	// Prepare and initialize uniform buffer containing shader uniforms
	void prepareUniformBuffers()
	{
		// Vertex shader uniform buffer block
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			sizeof(uboVS),
			&uboVS,
			&uniformData.vs.buffer,
			&uniformData.vs.memory,
			&uniformData.vs.descriptor);

		// Fragment sahder uniform buffer block
		// Contains font rendering parameters
		createBuffer(
			VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
			sizeof(uboFS),
			&uboFS,
			&uniformData.fs.buffer,
			&uniformData.fs.memory,
			&uniformData.fs.descriptor);

		updateUniformBuffers();
		updateFontSettings();
	}

	void updateUniformBuffers()
	{
		// Vertex shader
		glm::mat4 viewMatrix = glm::mat4();
		uboVS.projection = glm::perspective(deg_to_rad(splitScreen ? 45.0f : 60.0f), (float)width / (float)(height * ((splitScreen) ? 0.5f : 1.0f)), 0.001f, 256.0f);
		viewMatrix = glm::translate(viewMatrix, glm::vec3(0.0f, 0.0f, zoom));

		uboVS.model = glm::mat4();
		uboVS.model = viewMatrix * glm::translate(uboVS.model, glm::vec3(0, 0, 0));
		uboVS.model = glm::rotate(uboVS.model, deg_to_rad(rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
		uboVS.model = glm::rotate(uboVS.model, deg_to_rad(rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
		uboVS.model = glm::rotate(uboVS.model, deg_to_rad(rotation.z), glm::vec3(0.0f, 0.0f, 1.0f));

		uint8_t *pData;
		VkResult err = vkMapMemory(device, uniformData.vs.memory, 0, sizeof(uboVS), 0, (void **)&pData);
		assert(!err);
		memcpy(pData, &uboVS, sizeof(uboVS));
		vkUnmapMemory(device, uniformData.vs.memory);
	}

	void updateFontSettings()
	{
		// Fragment shader
		uint8_t *pData;
		VkResult err = vkMapMemory(device, uniformData.fs.memory, 0, sizeof(uboFS), 0, (void **)&pData);
		assert(!err);
		memcpy(pData, &uboFS, sizeof(uboFS));
		vkUnmapMemory(device, uniformData.fs.memory);
	}

	void prepare()
	{
		VulkanExampleBase::prepare();
		parsebmFont();
		loadTextures();
		generateQuad();
		setupVertexDescriptions();
		prepareUniformBuffers();
		setupDescriptorSetLayout();
		preparePipelines();
		setupDescriptorPool();
		setupDescriptorSet();
		buildCommandBuffers();
		prepared = true;
	}

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

	virtual void viewChanged()
	{
		updateUniformBuffers();
	}

	void toggleSplitScreen()
	{
		splitScreen = !splitScreen;
		reBuildCommandBuffers();
		updateUniformBuffers();
	}

	void toggleFontOutline()
	{
		uboFS.outline = !uboFS.outline;
		updateFontSettings();
	}

};

VulkanExample *vulkanExample;

#ifdef _WIN32

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	if (vulkanExample != NULL)
	{
		vulkanExample->handleMessages(hWnd, uMsg, wParam, lParam);
		if (uMsg == WM_KEYDOWN)
		{
			switch (wParam)
			{
			case 0x53:
				vulkanExample->toggleSplitScreen();
				break;
			case 0x4F:
				vulkanExample->toggleFontOutline();
				break;
			}
		}
	}
	return (DefWindowProc(hWnd, uMsg, wParam, lParam));
}

#else 

static void handleEvent(const xcb_generic_event_t *event)
{
	if (vulkanExample != NULL)
	{
		vulkanExample->handleEvent(event);
	}
}
#endif

#ifdef _WIN32
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR pCmdLine, int nCmdShow)
#else
int main(const int argc, const char *argv[])
#endif
{
	vulkanExample = new VulkanExample();
#ifdef _WIN32
	vulkanExample->setupWindow(hInstance, WndProc);
#else
	vulkanExample->setupWindow();
#endif
	vulkanExample->initSwapchain();
	vulkanExample->prepare();
	vulkanExample->renderLoop();
	delete(vulkanExample);
	return 0;
}