distancefieldfonts.cpp

/*
* 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
#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

// 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;
}

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 = -1.5f;
		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);
	}

	// Basic parser fpr AngelCode bitmap font format files
	// See http://www.angelcode.com/products/bmfont/doc/file_format.html for details
	void parsebmFont()
	{
		std::string fileName = getAssetPath() + "font.fnt";

#if defined(__ANDROID__)
		// Font description file is stored inside the apk
		// So we need to load it using the asset manager
		AAsset* asset = AAssetManager_open(androidApp->activity->assetManager, fileName.c_str(), AASSET_MODE_STREAMING);
		assert(asset);
		size_t size = AAsset_getLength(asset);

		assert(size > 0);

		void *fileData = malloc(size);
		AAsset_read(asset, fileData, size);
		AAsset_close(asset);

		std::stringbuf sbuf((const char*)fileData);
		std::istream istream(&sbuf);
#else
		std::filebuf fileBuffer;
		fileBuffer.open(fileName, std::ios::in);
		std::istream istream(&fileBuffer);
#endif

		assert(istream.good());

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

	}

	void loadTextures()
	{
		textureLoader->loadTexture(
			getAssetPath() + "textures/font_sdf_rgba.ktx",
			VK_FORMAT_R8G8B8A8_UNORM,
			&textures.fontSDF);
		textureLoader->loadTexture(
			getAssetPath() + "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;
				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]);

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

	void draw()
	{
		VkResult err;

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

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

		// Command buffer to be sumitted to the queue
		submitInfo.commandBufferCount = 1;
		submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];

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

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

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

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

	// todo : function fill buffer with quads from font

	// Creates a vertex buffer containing quads for the passed text
	void generateText(std:: string text)
	{
		std::vector<Vertex> vertexBuffer;
		std::vector<uint32_t> indexBuffer;
		uint32_t indexOffset = 0;

		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;
		}
		indices.count = indexBuffer.size();

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

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

		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.blendEnable = VK_TRUE;
		blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
		blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
		blendAttachmentState.colorBlendOp = VK_BLEND_OP_ADD;
		blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
		blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
		blendAttachmentState.alphaBlendOp = VK_BLEND_OP_ADD;
		blendAttachmentState.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;

		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;

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

		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
		shaderStages[0] = loadShader(getAssetPath() + "shaders/distancefieldfonts/bitmap.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
		shaderStages[1] = loadShader(getAssetPath() + "shaders/distancefieldfonts/bitmap.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
		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(glm::radians(splitScreen ? 45.0f : 45.0f), (float)width / (float)(height * ((splitScreen) ? 0.5f : 1.0f)), 0.001f, 256.0f);
		viewMatrix = glm::translate(viewMatrix, glm::vec3(0.0f, 0.0f, splitScreen ? zoom : zoom - 2.0f));

		uboVS.model = glm::mat4();
		uboVS.model = viewMatrix * glm::translate(uboVS.model, glm::vec3(0, 0, 0));
		uboVS.model = glm::rotate(uboVS.model, glm::radians(rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
		uboVS.model = glm::rotate(uboVS.model, glm::radians(rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
		uboVS.model = glm::rotate(uboVS.model, glm::radians(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();
		generateText("Vulkan");
		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;

#if defined(_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));
}
#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
}