path: root/src/game.c

#include <limits.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>

#include <shaderc/shaderc.h>

#define SDL_MAIN_HANDLED
#define VK_USE_PLATFORM_XCB_KHR
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_vulkan.h>

#include <vulkan/vulkan.h>
#include <vulkan/vk_enum_string_helper.h> // for string_VkResult

#define VMA_STATIC_VULKAN_FUNCTIONS 0
#define VMA_DYNAMIC_VULKAN_FUNCTIONS 1
#include "vk_mem_alloc.h"

//#include "cplusplus.h"
#include "vkutil.h"
#include "state.h"

// embedded clgm library
#define CGLM_FORCE_DEPTH_ZERO_TO_ONE
#include "../lib/cglm/include/cglm/cglm.h"

uint32_t currentFrame = 0;
state_t s;

const uint32_t validationLayerCount = 1;
const char *const validationLayers[] = {
  "VK_LAYER_KHRONOS_validation"
};

const uint32_t deviceExtensionCount = 1;
const char *const deviceExtensions[] = {
  VK_KHR_SWAPCHAIN_EXTENSION_NAME,
};

#ifdef VKDEBUG
    const bool enableValidationLayers = true;
#else
    const bool enableValidationLayers = false;
#endif

typedef struct {
  float x;
  float y;
} V2;

typedef struct {
  float x;
  float y;
  float z;
} V3;

typedef struct {
  V2 pos;
  V3 color;
} Vertex;

/* Vertex vertices[] = { */
/*   (Vertex) { (V2) {-0.2f, -0.5f}, (V3) {0.0f, 1.0f, 0.0f}}, */
/*   (Vertex) { (V2) {0.5f,  0.3f}, (V3) {0.0f, 0.0f, 1.0f}}, */
/*   (Vertex) { (V2) {-0.5f, 0.7f}, (V3) {1.0f, 0.0f, 0.0f}}, */
  
/*   (Vertex) { (V2) {0.2f, -0.5f}, (V3) {0.0f, 0.0f, 1.0f}}, */
/*   (Vertex) { (V2) {0.5f,  0.7f}, (V3) {1.0f, 0.0f, 0.0f}}, */
/*   (Vertex) { (V2) {-0.5f, 0.3f}, (V3) {0.0f, 1.0f, 0.0f}}, */
  
/*   (Vertex) { (V2) {0.0f, -0.5f}, (V3) {1.0f, 0.0f, 0.0f}}, */
/*   (Vertex) { (V2) {0.5f,  0.5f}, (V3) {0.0f, 1.0f, 0.0f}}, */
/*   (Vertex) { (V2) {-0.5f, 0.5f}, (V3) {0.0f, 0.0f, 1.0f}}, */
/* }; */
/* const int VERTICES_SIZE = VK_ARRAY_LEN(vertices); */

/* const uint16_t indices[] = { */
/*   0, 1, 2, 3, 4, 5, 6, 7, 8, */
/* }; */
/* const int INDICES_SIZE = VK_ARRAY_LEN(indices); */

Vertex vertices[] = {
  (Vertex) { (V2) {-0.5f, -0.5f}, (V3) {1.0f, 0.0f, 0.0f}},
  (Vertex) { (V2) {0.5f,  -0.5f}, (V3) {0.0f, 1.0f, 0.0f}},
  (Vertex) { (V2) {0.5f,   0.5f}, (V3) {0.0f, 0.0f, 1.0f}},
  (Vertex) { (V2) {-0.5f,  0.5f}, (V3) {1.0f, 1.0f, 1.0f}},
};
const int VERTICES_SIZE = VK_ARRAY_LEN(vertices);

const uint16_t indices[] = {
  0, 1, 2, 2, 3, 0
};
const int INDICES_SIZE = VK_ARRAY_LEN(indices);

bool
init()
{
  if (SDL_Init(SDL_INIT_VIDEO) < 0) {
    vk_log(VK_INFO, "SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
    return false;
  }

  s.sdl_window = SDL_CreateWindow("Vulkanizater",
                                      SDL_WINDOWPOS_UNDEFINED,
                                      SDL_WINDOWPOS_UNDEFINED,
                                      s.window_w,
                                      s.window_h,
                                      SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE | SDL_WINDOW_VULKAN);
  if (s.sdl_window == NULL) {
    vk_log(VK_INFO, "Window could not be created! SDL_Error: %s\n", SDL_GetError());
    return false;
  }

  return true;
}

void
closeSDL()
{
  SDL_DestroyWindow(s.sdl_window);
  s.sdl_window = NULL;
  SDL_Quit();
}

bool
checkValidationLayerSupport()
{
  uint32_t layerCount;
  vkEnumerateInstanceLayerProperties(&layerCount, NULL);

  VkLayerProperties availableLayers[layerCount];
  vkEnumerateInstanceLayerProperties(&layerCount, availableLayers);

  for (uint32_t i = 0; i < validationLayerCount; i++) {
    bool layerFound = false;

    for (uint32_t j = 0; j < layerCount; j++) {
      if (strcmp(validationLayers[i], availableLayers[j].layerName) == 0) {
        layerFound = true;
        break;
      }
    }

    if (!layerFound) {
      return false;
    }
  }

  return true;
}

static VKAPI_ATTR VkBool32 VKAPI_CALL
debugCallback(VkDebugUtilsMessageSeverityFlagBitsEXT messageSeverity,
              VkDebugUtilsMessageTypeFlagsEXT messageType,
              const VkDebugUtilsMessengerCallbackDataEXT* pCallbackData,
              void* pUserData)
{
  vk_log(VK_ERROR, "validation layer: %s\n", pCallbackData->pMessage);
  return VK_FALSE;
}

void
vulkan_setup_debug_messenger()
{
  if (!enableValidationLayers) return;
  VkDebugUtilsMessengerCreateInfoEXT createInfo = {0};
  createInfo.sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
  createInfo.messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
  createInfo.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
  createInfo.pfnUserCallback = debugCallback;
  createInfo.pUserData = NULL; // Optional


  // TODO: func pointers returned are NULL
  s.pfnCreateDebugUtilsMessengerEXT = (PFN_vkCreateDebugUtilsMessengerEXT)vkGetInstanceProcAddr(s.vk_instance, "vkCreateDebugUtilsMessengerEXT");
  s.pfnDestroyDebugUtilsMessengerEXT = (PFN_vkDestroyDebugUtilsMessengerEXT)vkGetInstanceProcAddr(s.vk_instance, "vkDestroyDebugUtilsMessengerEXT");
  
  VkResult result = s.pfnCreateDebugUtilsMessengerEXT(s.vk_instance, &createInfo, NULL, &s.vk_debug_messenger);
  if (result != VK_SUCCESS) {
    vk_log(VK_WARN, "failed to set up debug messenger! %s\n", string_VkResult(result));
  } else {
    vk_log(VK_INFO, "Debug messanger created!\n");
  }
}

void
vulkan_create_instance()
{
  if (enableValidationLayers && !checkValidationLayerSupport()) {
    vk_log(VK_ERROR, "validation layers requested, but not available!\n");
  }

  uint32_t instanceVersion;
  VkResult result = vkEnumerateInstanceVersion(&instanceVersion);
  if (result == VK_SUCCESS) {
    if (instanceVersion < VK_MAKE_API_VERSION(0, 1, 3, 0)) {
      vk_log(VK_ERROR, "Vulkan version 1.3 or greater required!\n");
      exit(1);
    }
    vk_log(VK_INFO, "Vulkan version found (%d) %d.%d.%d\n",
           VK_API_VERSION_VARIANT(instanceVersion),
           VK_API_VERSION_MAJOR(instanceVersion),
           VK_API_VERSION_MINOR(instanceVersion),
           VK_API_VERSION_PATCH(instanceVersion));
  } else {
    vk_log(VK_ERROR, "Failed to retrieve vulkan version, is vulkan supported in this system? %s\n", string_VkResult(result));
    exit(1);
  }

  // Load Vulkan and create instance
  VkApplicationInfo appInfo = {
    .sType = VK_STRUCTURE_TYPE_APPLICATION_INFO,
    .pApplicationName = "Vulkan Application",
    .applicationVersion = VK_MAKE_API_VERSION(0, 1, 3, 0),
    .pEngineName = NULL,
    .engineVersion = VK_MAKE_API_VERSION(0, 1, 3, 0),
    .apiVersion = VK_MAKE_API_VERSION(0, 1, 3, 0),
  };

  uint32_t sdlExtensionCount = 0;

  if (SDL_Vulkan_GetInstanceExtensions(s.sdl_window, &sdlExtensionCount, NULL) == SDL_FALSE) {
    vk_log(VK_ERROR, "SDL_Vulkan_GetInstanceExtensions failed: %s\n", SDL_GetError());
  }

  // make space for debug extenetion
  if (enableValidationLayers) {
    sdlExtensionCount++;
  }

  const char* sdlExtensions[sdlExtensionCount];

  if (SDL_Vulkan_GetInstanceExtensions(s.sdl_window, &sdlExtensionCount, sdlExtensions) == SDL_FALSE) {
    vk_log(VK_ERROR, "SDL_Vulkan_GetInstanceExtensions failed: %s\n", SDL_GetError());
  }

  // add debug extenetion
  if (enableValidationLayers) {
    sdlExtensions[sdlExtensionCount] = VK_EXT_DEBUG_UTILS_EXTENSION_NAME;
  }

  vk_log(VK_INFO, "The sdl extensions:\n");
  for (uint32_t i = 0; i < sdlExtensionCount; i++) {
    vk_log(VK_INFO, "\t%s\n", sdlExtensions[i]);
  }

  VkInstanceCreateInfo createInfo = {
    .sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
    .pApplicationInfo = &appInfo,
    .enabledExtensionCount = sdlExtensionCount,
    .ppEnabledExtensionNames = sdlExtensions,
    .enabledLayerCount = 0,
  };

  if (enableValidationLayers) {
    createInfo.enabledLayerCount = validationLayerCount;
    createInfo.ppEnabledLayerNames = validationLayers;
  }

  if (vkCreateInstance(&createInfo, NULL, &s.vk_instance) != VK_SUCCESS) {
    vk_log(VK_ERROR, "Can't start vulkan instance\n");
  }
  vk_log(VK_INFO, "Vulkan instance created\n");
}

VkExtent2D
chooseSwapExtent(const VkSurfaceCapabilitiesKHR * capabilities)
{
  if (capabilities->currentExtent.width != UINT32_MAX) {
    return capabilities->currentExtent;
  } else {
    int width, height;
    SDL_GetWindowSize(s.sdl_window, &width, &height);

    VkExtent2D actualExtent;
    actualExtent.width = (uint32_t) width;
    actualExtent.height = (uint32_t) height;

    // Manual implementation of std::clamp since it is not available in C
    actualExtent.width = (actualExtent.width < capabilities->minImageExtent.width) ? capabilities->minImageExtent.width :
                         (actualExtent.width > capabilities->maxImageExtent.width) ? capabilities->maxImageExtent.width :
                         actualExtent.width;

    actualExtent.height = (actualExtent.height < capabilities->minImageExtent.height) ? capabilities->minImageExtent.height :
                          (actualExtent.height > capabilities->maxImageExtent.height) ? capabilities->maxImageExtent.height :
                          actualExtent.height;

    return actualExtent;
  }
}

VkSurfaceFormatKHR
chooseSwapSurfaceFormat(const VkSurfaceFormatKHR * availableFormats, uint32_t formatCount)
{
  for (uint32_t i = 0 ; i < formatCount; i ++) {
    if (availableFormats[i].format == VK_FORMAT_B8G8R8A8_SRGB &&
        availableFormats[i].colorSpace == VK_COLOR_SPACE_SRGB_NONLINEAR_KHR) {
      return availableFormats[i];
    }
  }

  // if it fails pick the first one
  return availableFormats[0];
}

VkPresentModeKHR
chooseSwapPresentMode(const VkPresentModeKHR * presentModes, uint32_t presentModeCount)
{
  for (uint32_t i = 0 ; i < presentModeCount; i ++) {
    if (presentModes[i] == VK_PRESENT_MODE_MAILBOX_KHR) {
      return presentModes[i];
    }
  }

  // if it fails pick the the FIFO one
  return VK_PRESENT_MODE_FIFO_KHR;
}

typedef struct SwapChainSupportDetails {
  VkSurfaceCapabilitiesKHR capabilities;
  VkSurfaceFormatKHR formats[100];
  uint32_t formatCount;
  VkPresentModeKHR presentModes[100];
  uint32_t presentModeCount;
} SwapChainSupportDetails;

SwapChainSupportDetails
querySwapChainSupport(VkPhysicalDevice device)
{
  SwapChainSupportDetails details;

  vkGetPhysicalDeviceSurfaceCapabilitiesKHR(device, s.vk_surface, &details.capabilities);

  vkGetPhysicalDeviceSurfaceFormatsKHR(device, s.vk_surface, &details.formatCount, NULL);

  if (details.formatCount != 0) {
    // todo alloc format arrray
    vkGetPhysicalDeviceSurfaceFormatsKHR(device, s.vk_surface, &details.formatCount, details.formats);
  }

  vkGetPhysicalDeviceSurfacePresentModesKHR(device, s.vk_surface, &details.presentModeCount, NULL);

  if (details.presentModeCount != 0) {
    // todo alloc presentModes array
    vkGetPhysicalDeviceSurfacePresentModesKHR(device, s.vk_surface, &details.presentModeCount, details.presentModes);
  }

  return details;
}

typedef struct QueueFamilyIndices {
  uint32_t graphicsFamily;
  bool graphicsFlag;
  uint32_t presentFamily;
  bool presentFlag;
} QueueFamilyIndices;

bool
vulkan_queue_family_check_flags(QueueFamilyIndices x)
{
  return x.graphicsFlag && x.presentFlag;
}

QueueFamilyIndices vulkan_find_queue_families(VkPhysicalDevice device) {
  QueueFamilyIndices indices;
  indices.graphicsFlag = false;
  indices.presentFlag = false;

  uint32_t queueFamilyCount = 0;
  vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, NULL);

  VkQueueFamilyProperties queueFamilies[queueFamilyCount];
  vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, queueFamilies);

  for (uint32_t i = 0; i < queueFamilyCount; i++) {
    if (queueFamilies[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) {
      indices.graphicsFamily = i;
      indices.graphicsFlag = true;
    }

    VkBool32 presentSupport = false;
    vkGetPhysicalDeviceSurfaceSupportKHR(device, i, s.vk_surface, &presentSupport);
    if (presentSupport) {
      indices.presentFamily = i;
      indices.presentFlag = true;
    }

    if (vulkan_queue_family_check_flags(indices)) break;
  }

  return indices;
}

bool
vulkan_check_device_extension_support(VkPhysicalDevice device)
{
  uint32_t extensionCount;
  vkEnumerateDeviceExtensionProperties(device, NULL, &extensionCount, NULL);

  VkExtensionProperties availableExtensions[extensionCount];
  vkEnumerateDeviceExtensionProperties(device, NULL, &extensionCount, availableExtensions);

  uint32_t flag = 0;

  for (uint32_t i = 0; i < deviceExtensionCount; i++) {
    for (uint32_t j = 0; j < extensionCount; j++) {
      if (strcmp(deviceExtensions[i], availableExtensions[j].extensionName) == 0) {
        flag++;
        break;
      }
    }
  }

  return flag == deviceExtensionCount;
}

bool
vulkan_is_device_suitable(VkPhysicalDevice device)
{
  QueueFamilyIndices indices = vulkan_find_queue_families(device);
  bool extensionsSupported = vulkan_check_device_extension_support(device);

  bool swapChainAdequate = false;
  if (extensionsSupported) {
    SwapChainSupportDetails swapChainSupport = querySwapChainSupport(device);
    swapChainAdequate = !(swapChainSupport.formatCount == 0) && !(swapChainSupport.presentModeCount == 0);
  }

  return vulkan_queue_family_check_flags(indices) && extensionsSupported && swapChainAdequate;
}

void
vulkan_pick_physical_device()
{
  uint32_t deviceCount = 0;
  vkEnumeratePhysicalDevices(s.vk_instance, &deviceCount, NULL);
  if (deviceCount == 0) {
    vk_log(VK_INFO, "failed to find GPUs with Vulkan support!\n");
  }

  VkPhysicalDevice devices[deviceCount];
  vkEnumeratePhysicalDevices(s.vk_instance, &deviceCount, devices);

  for (uint32_t i = 0; i < deviceCount; i++) {
    if (vulkan_is_device_suitable(devices[i])) {
      s.vk_physical_device = devices[i];
      break;
    }
  }

  if (s.vk_physical_device == VK_NULL_HANDLE) {
    vk_log(VK_ERROR, "failed to find a suitable GPU!\n");
  }

  VkPhysicalDeviceProperties deviceProperties;
  vkGetPhysicalDeviceProperties(s.vk_physical_device, &deviceProperties);
  vk_log(VK_INFO, "Picked [%s] physical device.\n", deviceProperties.deviceName);

  uint32_t extensionCount = 0;
  vkEnumerateInstanceExtensionProperties(NULL, &extensionCount, NULL);
  VkExtensionProperties extensions[extensionCount];
  VkResult result = vkEnumerateInstanceExtensionProperties(NULL, &extensionCount, extensions);

  vk_log(VK_INFO, "Vulkan enabled extensions: %s\n", string_VkResult(result));
  for (uint32_t i = 0; i < extensionCount; i++) {
    vk_log(VK_INFO, "\t%s\n", extensions[i].extensionName);
  }

}

void
vulkan_create_logical_device()
{
  QueueFamilyIndices indices = vulkan_find_queue_families(s.vk_physical_device);

  // TODO CREATE MULPILE QUEUES
  // https://vulkan-tutorial.com/en/Drawing_a_triangle/Presentation/Window_surface#page_Creating-the-presentation-queue

  VkDeviceQueueCreateInfo queueCreateInfo = {
    .sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO,
    .queueFamilyIndex = indices.graphicsFamily,
    .queueCount = 1,
  };

  float queuePriority = 1.0f;
  queueCreateInfo.pQueuePriorities = &queuePriority;

  VkPhysicalDeviceFeatures deviceFeatures = {0};
  vkGetPhysicalDeviceFeatures(s.vk_physical_device, &deviceFeatures);
#ifndef NDEBUG
  /* Disable robust buffer access when building without debug */
  deviceFeatures.robustBufferAccess = VK_FALSE;
#endif

  VkPhysicalDeviceDynamicRenderingFeaturesKHR dynamic_rendering_feature = {
    .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_DYNAMIC_RENDERING_FEATURES_KHR,
    .dynamicRendering = VK_TRUE,
  };

  VkDeviceCreateInfo createInfo = {
    .sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO,
    .pQueueCreateInfos = &queueCreateInfo,
    .queueCreateInfoCount = 1,
    .pNext = &dynamic_rendering_feature,
    .pEnabledFeatures = &deviceFeatures,
    .enabledExtensionCount = deviceExtensionCount,
    .ppEnabledExtensionNames = deviceExtensions,
    .enabledLayerCount = 0,
  };

  if (vkCreateDevice(s.vk_physical_device, &createInfo, NULL, &s.vk_device) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create logical device!\n");
  }
  vk_log(VK_INFO, "Vulkan logical device created\n");

  vkGetDeviceQueue(s.vk_device, indices.graphicsFamily, 0, &s.vk_graphics_queue);
  vkGetDeviceQueue(s.vk_device, indices.presentFamily, 0, &s.vk_present_queue);
}

void
handle_input(bool * quit)
{
  SDL_Event e;

  while (SDL_PollEvent(&e) != 0) {
    // User requests quit
    if (e.type == SDL_QUIT) {
      *quit = true;
    }
      // User presses a key
    else if (e.type == SDL_KEYDOWN) {
      switch (e.key.keysym.sym) {
      case SDLK_UP:
        s.x += .1f;
        break;
      case SDLK_DOWN:
        s.x -= .1f;
        break;
      case SDLK_LEFT:
        break;
      case SDLK_RIGHT:
        break;
      }
    }
    else if (e.type == SDL_MOUSEWHEEL) {
      if(e.wheel.y > 0) // scroll up
        {
          s.zoom += 1;
        }
      else if(e.wheel.y < 0) // scroll down
        {
          s.zoom -= 1;
          if (s.zoom == -100) s.zoom = 1;
        }
    }
  }
}

void
vulkan_create_surface()
{
  if (SDL_Vulkan_CreateSurface(s.sdl_window, s.vk_instance, &s.vk_surface) == SDL_FALSE) {
    vk_log(VK_INFO, "Failed to create surface\n");
  } else {
    vk_log(VK_INFO, "Vulkan surface created\n");
  }
}

void
vulkan_create_swap_chain()
{
  SwapChainSupportDetails swapChainSupport = querySwapChainSupport(s.vk_physical_device);

  VkSurfaceFormatKHR surfaceFormat = chooseSwapSurfaceFormat(swapChainSupport.formats, swapChainSupport.formatCount);
  VkPresentModeKHR presentMode = chooseSwapPresentMode(swapChainSupport.presentModes, swapChainSupport.presentModeCount);
  VkExtent2D extent = chooseSwapExtent(&swapChainSupport.capabilities);

  uint32_t imageCount = swapChainSupport.capabilities.minImageCount + 1;

  if (swapChainSupport.capabilities.maxImageCount > 0 && imageCount > swapChainSupport.capabilities.maxImageCount) {
    imageCount = swapChainSupport.capabilities.maxImageCount;
  }

  VkSwapchainCreateInfoKHR createInfo = {
    .sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR,
    .surface = s.vk_surface,
    .minImageCount = imageCount,
    .imageFormat = surfaceFormat.format,
    .imageColorSpace = surfaceFormat.colorSpace,
    .imageExtent = extent,
    .imageArrayLayers = 1,
    .imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
  };

  QueueFamilyIndices indices = vulkan_find_queue_families(s.vk_physical_device);

  uint32_t queueFamilyIndices[] = {indices.graphicsFamily, indices.presentFamily};

  if (indices.graphicsFamily != indices.presentFamily) {
    createInfo.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
    createInfo.queueFamilyIndexCount = 2;
    createInfo.pQueueFamilyIndices = queueFamilyIndices;
  } else {
    createInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
    createInfo.queueFamilyIndexCount = 0; // Optional
    createInfo.pQueueFamilyIndices = NULL; // Optional
  }

  createInfo.preTransform = swapChainSupport.capabilities.currentTransform;
  createInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
  createInfo.presentMode = presentMode;
  createInfo.clipped = VK_TRUE;
  createInfo.oldSwapchain = VK_NULL_HANDLE;

  VK_CHECK(vkCreateSwapchainKHR(s.vk_device, &createInfo, NULL, &s.vk_swap_chain));
  /* if (result != VK_SUCCESS) { */
  /*   vk_log(VK_ERROR, "ERROR: failed to create swap chain!  %s\n", string_VkResult(result)); */
  /* } */

  vkGetSwapchainImagesKHR(s.vk_device, s.vk_swap_chain, &s.vk_swap_chain_image_count, NULL);
  //vk_log(VK_INFO, "vk_swap_chain_images count: %d\n", s.vk_swap_chain_image_count);
  // todo alloc space for images
  vkGetSwapchainImagesKHR(s.vk_device, s.vk_swap_chain, &s.vk_swap_chain_image_count, s.vk_swap_chain_images);

  s.vk_swap_chain_image_format = surfaceFormat.format;
  s.vk_swap_chain_extent = extent;

  vk_log(VK_INFO, "Vulkan swapchain created!\n");
}

void
vulkan_create_image_views()
{
  for (size_t i = 0; i < s.vk_swap_chain_image_count; i++) {
    VkImageViewCreateInfo createInfo = {
      .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
      .image = s.vk_swap_chain_images[i],
      .viewType = VK_IMAGE_VIEW_TYPE_2D,
      .format = s.vk_swap_chain_image_format,
      .components.r = VK_COMPONENT_SWIZZLE_IDENTITY,
      .components.g = VK_COMPONENT_SWIZZLE_IDENTITY,
      .components.b = VK_COMPONENT_SWIZZLE_IDENTITY,
      .components.a = VK_COMPONENT_SWIZZLE_IDENTITY,
      .subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
      .subresourceRange.baseMipLevel = 0,
      .subresourceRange.levelCount = 1,
      .subresourceRange.baseArrayLayer = 0,
      .subresourceRange.layerCount = 1,
    };

    if (vkCreateImageView(s.vk_device, &createInfo, NULL, &s.vk_swap_chain_image_views[i]) != VK_SUCCESS) {
      vk_log(VK_ERROR, "failed to create image views!\n");
    }
  }
  vk_log(VK_INFO, "Vulkan image views created!\n");
}

VkShaderModule
createShaderModule(const char * code, long size)
{
  VkShaderModuleCreateInfo createInfo = {0};
  createInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
  createInfo.codeSize = size;
  createInfo.pCode = (const uint32_t *)code;

  VkShaderModule shaderModule;
  if (vkCreateShaderModule(s.vk_device, &createInfo, NULL, &shaderModule) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create shader module!\n");
  }

  return shaderModule;
}

shaderc_compilation_result_t
load_compile_shader_data(const char * path, shaderc_shader_kind shader_kind)
{
  FILE* file = fopen(path, "r");
  if (!file) {
    vk_log(VK_ERROR, "SHADER COMPILATION: Failed to open file: %s\n", path);
    return NULL;
  }

  fseek(file, 0, SEEK_END);
  long glsl_length = ftell(file);
  fseek(file, 0, SEEK_SET);

  char* glsl_src = (char*)malloc(glsl_length + 1);
  if (!glsl_src) {
    vk_log(VK_ERROR, "SHADER COMPILATION: Failed to allocate memory\n");
    fclose(file);
    return NULL;
  }

  fread(glsl_src, 1, glsl_length, file);
  glsl_src[glsl_length] = '\0';
  fclose(file);

  shaderc_compiler_t compiler = shaderc_compiler_initialize();
  if (!compiler) {
    vk_log(VK_ERROR, "SHADER COMPILATION: Failed to initialize shader compiler\n");
    free(glsl_src);
    return NULL;
  }

  shaderc_compile_options_t options = shaderc_compile_options_initialize();
  shaderc_compilation_result_t result = shaderc_compile_into_spv(compiler,
                                                                 glsl_src,
                                                                 glsl_length,
                                                                 shader_kind,
                                                                 path, "main", options);

  if (shaderc_result_get_compilation_status(result) != shaderc_compilation_status_success) {
    vk_log(VK_ERROR, "SHADER COMPILATION: error: %s\n", shaderc_result_get_error_message(result));
    shaderc_result_release(result);
    shaderc_compiler_release(compiler);
    free(glsl_src);
    return NULL;
  }

  shaderc_compiler_release(compiler);
  free(glsl_src);

  return result;
}

void
vulkan_create_graphics_pipeline()
{
  shaderc_compilation_result_t vert_result = load_compile_shader_data("shader.vert", shaderc_vertex_shader);
  if (!vert_result) {
    vk_log(VK_ERROR, "Can't load vertex shader");
  }
  shaderc_compilation_result_t frag_result = load_compile_shader_data("shader.frag", shaderc_fragment_shader);
  if (!frag_result) {
    vk_log(VK_ERROR, "Can't load fragment shader");
  }

  const char * vert_data = shaderc_result_get_bytes(vert_result);
  long vert_size = shaderc_result_get_length(vert_result);
  const char * frag_data = shaderc_result_get_bytes(frag_result);
  long frag_size = shaderc_result_get_length(frag_result);

  vk_log(VK_INFO, "Shaders loaded\n");

  VkShaderModule vertShaderModule = createShaderModule(vert_data, vert_size);
  VkShaderModule fragShaderModule = createShaderModule(frag_data, frag_size);

  VkPipelineShaderStageCreateInfo vertShaderStageInfo = {0};
  vertShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
  vertShaderStageInfo.stage = VK_SHADER_STAGE_VERTEX_BIT;
  vertShaderStageInfo.module = vertShaderModule;
  vertShaderStageInfo.pName = "main";

  VkPipelineShaderStageCreateInfo fragShaderStageInfo = {0};
  fragShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
  fragShaderStageInfo.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
  fragShaderStageInfo.module = fragShaderModule;
  fragShaderStageInfo.pName = "main";

  VkPipelineShaderStageCreateInfo shaderStages[] = {vertShaderStageInfo, fragShaderStageInfo};

  VkDynamicState dynamicStates[] = {
    VK_DYNAMIC_STATE_VIEWPORT,
    VK_DYNAMIC_STATE_SCISSOR
  };

  VkPipelineDynamicStateCreateInfo dynamicState = {0};
  dynamicState.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
  dynamicState.dynamicStateCount = 2;
  dynamicState.pDynamicStates = dynamicStates;

  VkVertexInputBindingDescription bindingDescription = {0};
  bindingDescription.binding = 0;
  bindingDescription.stride = sizeof(Vertex);
  bindingDescription.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;

  VkVertexInputAttributeDescription attributeDescriptions[2] = {0};
  attributeDescriptions[0].binding = 0;
  attributeDescriptions[0].location = 0;
  attributeDescriptions[0].format = VK_FORMAT_R32G32_SFLOAT;
  attributeDescriptions[0].offset = offsetof(Vertex, pos);

  attributeDescriptions[1].binding = 0;
  attributeDescriptions[1].location = 1;
  attributeDescriptions[1].format = VK_FORMAT_R32G32B32_SFLOAT;
  attributeDescriptions[1].offset = offsetof(Vertex, color);

  VkPipelineVertexInputStateCreateInfo vertexInputInfo = {0};
  vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
  vertexInputInfo.vertexBindingDescriptionCount = 1;
  vertexInputInfo.pVertexBindingDescriptions = &bindingDescription;
  vertexInputInfo.vertexAttributeDescriptionCount = 2;
  vertexInputInfo.pVertexAttributeDescriptions = attributeDescriptions;

  VkPipelineInputAssemblyStateCreateInfo inputAssembly = {};
  inputAssembly.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
  inputAssembly.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
  inputAssembly.primitiveRestartEnable = VK_FALSE;

  VkViewport viewport = {0};
  viewport.x = 0.0f;
  viewport.y = 0.0f;
  viewport.width = (float) s.vk_swap_chain_extent.width;
  viewport.height = (float) s.vk_swap_chain_extent.height;
  viewport.minDepth = 0.0f;
  viewport.maxDepth = 1.0f;

  VkRect2D scissor = {0};
  scissor.offset = (VkOffset2D){0, 0};
  scissor.extent = s.vk_swap_chain_extent;

  VkPipelineViewportStateCreateInfo viewportState = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,
    .viewportCount = 1,
    .pViewports = &viewport,
    .scissorCount = 1,
    .pScissors = &scissor,
  };

  VkPipelineRasterizationStateCreateInfo rasterizer = {0};
  rasterizer.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
  rasterizer.depthClampEnable = VK_FALSE;
  rasterizer.rasterizerDiscardEnable = VK_FALSE;
  rasterizer.polygonMode = VK_POLYGON_MODE_FILL;
  rasterizer.lineWidth = 1.0f;
  rasterizer.cullMode = VK_CULL_MODE_NONE;
//  rasterizer.cullMode = VK_CULL_MODE_BACK_BIT;
  rasterizer.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
  rasterizer.depthBiasEnable = VK_FALSE;
  rasterizer.depthBiasConstantFactor = 0.0f; // Optional
  rasterizer.depthBiasClamp = 0.0f; // Optional
  rasterizer.depthBiasSlopeFactor = 0.0f; // Optional

  VkPipelineMultisampleStateCreateInfo multisampling = {0};
  multisampling.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
  multisampling.sampleShadingEnable = VK_FALSE;
  multisampling.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
  multisampling.minSampleShading = 1.0f; // Optional
  multisampling.pSampleMask = NULL; // Optional
  multisampling.alphaToCoverageEnable = VK_FALSE; // Optional
  multisampling.alphaToOneEnable = VK_FALSE; // Optional

  VkPipelineColorBlendAttachmentState colorBlendAttachment = {0};
  colorBlendAttachment.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
  colorBlendAttachment.blendEnable = VK_TRUE;
  colorBlendAttachment.srcColorBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
  colorBlendAttachment.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
  colorBlendAttachment.colorBlendOp = VK_BLEND_OP_ADD;
  colorBlendAttachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
  colorBlendAttachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
  colorBlendAttachment.alphaBlendOp = VK_BLEND_OP_ADD;
  /* colorBlendAttachment.blendEnable = VK_FALSE; */
  /* colorBlendAttachment.srcColorBlendFactor = VK_BLEND_FACTOR_ONE; // Optional */
  /* colorBlendAttachment.dstColorBlendFactor = VK_BLEND_FACTOR_ZERO; // Optional */
  /* colorBlendAttachment.colorBlendOp = VK_BLEND_OP_ADD; // Optional */
  /* colorBlendAttachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE; // Optional */
  /* colorBlendAttachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO; // Optional */
  /* colorBlendAttachment.alphaBlendOp = VK_BLEND_OP_ADD; // Optional   */

  VkPipelineColorBlendStateCreateInfo colorBlending = {0};
  colorBlending.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
  colorBlending.logicOpEnable = VK_FALSE;
  colorBlending.logicOp = VK_LOGIC_OP_COPY; // Optional
  colorBlending.attachmentCount = 1;
  colorBlending.pAttachments = &colorBlendAttachment;
  colorBlending.blendConstants[0] = 0.0f; // Optional
  colorBlending.blendConstants[1] = 0.0f; // Optional
  colorBlending.blendConstants[2] = 0.0f; // Optional
  colorBlending.blendConstants[3] = 0.0f; // Optional

  VkPipelineLayoutCreateInfo pipelineLayoutInfo = {0};
  pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
  pipelineLayoutInfo.setLayoutCount = 1;
  pipelineLayoutInfo.pSetLayouts = &s.vk_descriptor_set_layout;
  pipelineLayoutInfo.pushConstantRangeCount = 0; // Optional
  pipelineLayoutInfo.pPushConstantRanges = NULL; // Optional

  if (vkCreatePipelineLayout(s.vk_device, &pipelineLayoutInfo, NULL, &s.vk_pipeline_layout) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create pipeline layout!\n");
  }

  VkGraphicsPipelineCreateInfo pipelineInfo = {0};
  pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
  pipelineInfo.stageCount = 2;
  pipelineInfo.pStages = shaderStages;

  pipelineInfo.pVertexInputState = &vertexInputInfo;
  pipelineInfo.pInputAssemblyState = &inputAssembly;
  pipelineInfo.pViewportState = &viewportState;
  pipelineInfo.pRasterizationState = &rasterizer;
  pipelineInfo.pMultisampleState = &multisampling;
  pipelineInfo.pDepthStencilState = NULL; // Optional
  pipelineInfo.pColorBlendState = &colorBlending;
  pipelineInfo.pDynamicState = &dynamicState;
  pipelineInfo.layout = s.vk_pipeline_layout;
  pipelineInfo.renderPass = s.vk_render_pass;
  pipelineInfo.subpass = 0;
  pipelineInfo.basePipelineHandle = VK_NULL_HANDLE; // Optional
  pipelineInfo.basePipelineIndex = -1; // Optional

  if (vkCreateGraphicsPipelines(s.vk_device, VK_NULL_HANDLE, 1, &pipelineInfo, NULL, &s.vk_graphics_pipeline) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create graphics pipeline!\n");
  }

  shaderc_result_release(vert_result);
  shaderc_result_release(frag_result);

  vkDestroyShaderModule(s.vk_device, fragShaderModule, NULL);
  vkDestroyShaderModule(s.vk_device, vertShaderModule, NULL);
}

void
vulkan_create_render_pass()
{
  VkAttachmentDescription colorAttachment = {0};
  colorAttachment.format = s.vk_swap_chain_image_format;
  colorAttachment.samples = VK_SAMPLE_COUNT_1_BIT;
  colorAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
  colorAttachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
  colorAttachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
  colorAttachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
  colorAttachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
  colorAttachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;

  VkAttachmentReference colorAttachmentRef = {0};
  colorAttachmentRef.attachment = 0;
  colorAttachmentRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;

  VkSubpassDescription subpass = {0};
  subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
  subpass.colorAttachmentCount = 1;
  subpass.pColorAttachments = &colorAttachmentRef;

  VkSubpassDependency dependency = {0};
  dependency.srcSubpass = VK_SUBPASS_EXTERNAL;
  dependency.dstSubpass = 0;
  dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
  dependency.srcAccessMask = 0;
  dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
  dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;

  VkRenderPassCreateInfo renderPassInfo = {0};
  renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
  renderPassInfo.attachmentCount = 1;
  renderPassInfo.pAttachments = &colorAttachment;
  renderPassInfo.subpassCount = 1;
  renderPassInfo.pSubpasses = &subpass;
  renderPassInfo.dependencyCount = 1;
  renderPassInfo.pDependencies = &dependency;

  if (vkCreateRenderPass(s.vk_device, &renderPassInfo, NULL, &s.vk_render_pass) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create render pass!\n");
  }
}

void
vulkan_create_framebuffers()
{
  s.vk_swap_chain_framebuffers_count = s.vk_swap_chain_image_count;
  for (size_t i = 0; i < s.vk_swap_chain_image_count; i++) {
    VkImageView attachments[] = {
      s.vk_swap_chain_image_views[i]
    };

    VkFramebufferCreateInfo framebufferInfo = {0};
    framebufferInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
    framebufferInfo.renderPass = s.vk_render_pass;
    framebufferInfo.attachmentCount = 1;
    framebufferInfo.pAttachments = attachments;
    framebufferInfo.width = s.vk_swap_chain_extent.width;
    framebufferInfo.height = s.vk_swap_chain_extent.height;
    framebufferInfo.layers = 1;

    if (vkCreateFramebuffer(s.vk_device, &framebufferInfo, NULL, &s.vk_swap_chain_framebuffers[i]) != VK_SUCCESS) {
      vk_log(VK_ERROR, "failed to create framebuffer!\n");
    }
  }

}

void
vulkan_create_command_pool()
{
  QueueFamilyIndices queueFamilyIndices = vulkan_find_queue_families(s.vk_physical_device);

  VkCommandPoolCreateInfo poolInfo = {0};
  poolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
  poolInfo.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
  poolInfo.queueFamilyIndex = queueFamilyIndices.graphicsFamily;

  if (vkCreateCommandPool(s.vk_device, &poolInfo, NULL, &s.vk_command_pool) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create command pool!\n");
  }

}

void
vulkan_create_command_buffer()
{
  VkCommandBufferAllocateInfo allocInfo = {0};
  allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
  allocInfo.commandPool = s.vk_command_pool;
  allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
  allocInfo.commandBufferCount = MAX_FRAMES_IN_FLIGHT;

  if (vkAllocateCommandBuffers(s.vk_device, &allocInfo, s.vk_command_buffers) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to allocate command buffers!\n");
  }
}

void
recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex)
{
  VkCommandBufferBeginInfo beginInfo = {0};
  beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
  beginInfo.flags = 0; // Optional
  beginInfo.pInheritanceInfo = NULL; // Optional

  if (vkBeginCommandBuffer(commandBuffer, &beginInfo) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to begin recording command buffer!\n");
  }

  VkRenderPassBeginInfo renderPassInfo = {0};
  renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
  renderPassInfo.renderPass = s.vk_render_pass;
  renderPassInfo.framebuffer = s.vk_swap_chain_framebuffers[imageIndex];
  renderPassInfo.renderArea.offset = (VkOffset2D){0, 0};
  renderPassInfo.renderArea.extent = s.vk_swap_chain_extent;

  VkClearValue clearColor = {{{0.0f, 0.0f, 0.0f, 1.0f}}};
  renderPassInfo.clearValueCount = 1;
  renderPassInfo.pClearValues = &clearColor;

  // TODO DYNAMIC RENDERING
  /* VkRenderingAttachmentInfo colorAttachment = {}; */
  /* colorAttachment.sType = VK_STRUCTURE_TYPE_RENDERING_ATTACHMENT_INFO; */
  /* colorAttachment.imageView = s.vk_swap_chain_image_views[imageIndex]; */
  /* colorAttachment.imageLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL; */
  /* colorAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR; */
  /* colorAttachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE; */
  /* //colorAttachment.clearValue.color = clearColor; */

  /* VkRenderingInfo renderingInfo = {}; */
  /* renderingInfo.sType = VK_STRUCTURE_TYPE_RENDERING_INFO; */
  /* renderingInfo.renderArea = (VkRect2D){ {0, 0}, {(float)(s.vk_swap_chain_extent.width), (float)(s.vk_swap_chain_extent.height)} }; */
  /* renderingInfo.layerCount = 1; */
  /* renderingInfo.colorAttachmentCount = 1; */
  /* renderingInfo.pColorAttachments = &colorAttachment; */

  /* vkCmdBeginRendering(commandBuffer, &renderingInfo); */
  /*   .... */  
  /* vkCmdEndRendering(commandBuffer); */

  vkCmdBeginRenderPass(commandBuffer, &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);

  vkCmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, s.vk_graphics_pipeline);

  VkViewport viewport = {0};
  viewport.x = 0.0f;
  viewport.y = 0.0f;
  viewport.width = (float)(s.vk_swap_chain_extent.width);
  viewport.height = (float)(s.vk_swap_chain_extent.height);
  viewport.minDepth = 0.0f;
  viewport.maxDepth = 1.0f;
  vkCmdSetViewport(commandBuffer, 0, 1, &viewport);

  VkRect2D scissor = {0};
  scissor.offset = (VkOffset2D){0, 0};
  scissor.extent = s.vk_swap_chain_extent;
  vkCmdSetScissor(commandBuffer, 0, 1, &scissor);

  VkBuffer vertexBuffers[] = {s.vk_vertex_buffer};
  VkDeviceSize offsets[] = {0};
  vkCmdBindVertexBuffers(commandBuffer, 0, 1, vertexBuffers, offsets);
  vkCmdBindIndexBuffer(commandBuffer, s.vk_index_buffer, 0, VK_INDEX_TYPE_UINT16);
  vkCmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, s.vk_pipeline_layout, 0, 1, &s.vk_descriptor_sets[currentFrame], 0, NULL);
  
  vkCmdDrawIndexed(commandBuffer, INDICES_SIZE, 1, 0, 0, 0);

  vkCmdEndRenderPass(commandBuffer);

  if (vkEndCommandBuffer(commandBuffer) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to record command buffer!\n");
  }
}

void
vulkan_create_sync_objects()
{
  VkSemaphoreCreateInfo semaphoreInfo = {0};
  semaphoreInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;

  VkFenceCreateInfo fenceInfo = {0};
  fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
  fenceInfo.flags = VK_FENCE_CREATE_SIGNALED_BIT;

  for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
    if (vkCreateSemaphore(s.vk_device, &semaphoreInfo, NULL, &s.imageAvailableSemaphores[i]) != VK_SUCCESS ||
        vkCreateSemaphore(s.vk_device, &semaphoreInfo, NULL, &s.renderFinishedSemaphores[i]) != VK_SUCCESS ||
        vkCreateFence(s.vk_device, &fenceInfo, NULL, &s.inFlightFences[i]) != VK_SUCCESS) {
      vk_log(VK_ERROR, "failed to create semaphores!\n");
    }
  }
}

uint32_t
findMemoryType(uint32_t typeFilter, VkMemoryPropertyFlags properties)
{
  VkPhysicalDeviceMemoryProperties memProperties;
  vkGetPhysicalDeviceMemoryProperties(s.vk_physical_device, &memProperties);

  for (uint32_t i = 0; i < memProperties.memoryTypeCount; i++) {
    if ((typeFilter & (1 << i)) && (memProperties.memoryTypes[i].propertyFlags & properties) == properties) {
        return i;
    }
  }

  vk_log(VK_ERROR, "failed to find suitable memory type!\n");
  return 9999;
}

void
createBuffer(VkDeviceSize size,
             VkBufferUsageFlags usage,
             VkMemoryPropertyFlags properties,
             VkBuffer *buffer, VkDeviceMemory *bufferMemory)
{
  VkBufferCreateInfo bufferInfo = {0};
  bufferInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
  bufferInfo.size = size;
  bufferInfo.usage = usage;
  bufferInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;

  if (vkCreateBuffer(s.vk_device, &bufferInfo, NULL, buffer) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create buffer!\n");
  }

  VkMemoryRequirements memRequirements;
  vkGetBufferMemoryRequirements(s.vk_device, *buffer, &memRequirements);

  VkMemoryAllocateInfo allocInfo = {0};
  allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
  allocInfo.allocationSize = memRequirements.size;
  allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, properties);

  // TODO: allocations limited by hardware
  if (vkAllocateMemory(s.vk_device, &allocInfo, NULL, bufferMemory) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to allocate buffer memory!\n");
  }

  vkBindBufferMemory(s.vk_device, *buffer, *bufferMemory, 0);
}

/* void */
/* vulkan_create_vertex_buffer() */
/* { */
/*   VkDeviceSize bufferSize = sizeof(vertices[0]) * VERTICES_SIZE; */
/*   createBuffer(bufferSize, */
/*                VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, */
/*                VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, */
/*                &s.vk_vertex_buffer, &s.vk_vertex_buffer_memory); */
  
/*   void* data; */
/*   vkMapMemory(s.vk_device, s.vk_vertex_buffer_memory, 0, bufferSize, 0, &data); */
/*   memcpy(data, vertices, (size_t) bufferSize); */
/*   vkUnmapMemory(s.vk_device, s.vk_vertex_buffer_memory); */
/* } */
void
copyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size) {
  VkCommandBufferAllocateInfo allocInfo = {0};
  allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
  allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
  allocInfo.commandPool = s.vk_command_pool;
  allocInfo.commandBufferCount = 1;

  VkCommandBuffer commandBuffer;
  vkAllocateCommandBuffers(s.vk_device, &allocInfo, &commandBuffer);

  VkCommandBufferBeginInfo beginInfo = {0};
  beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
  beginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;

  vkBeginCommandBuffer(commandBuffer, &beginInfo);
    VkBufferCopy copyRegion = {0};
    copyRegion.srcOffset = 0; // Optional
    copyRegion.dstOffset = 0; // Optional
    copyRegion.size = size;
    vkCmdCopyBuffer(commandBuffer, srcBuffer, dstBuffer, 1, &copyRegion);
  vkEndCommandBuffer(commandBuffer);

  VkSubmitInfo submitInfo = {0};
  submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
  submitInfo.commandBufferCount = 1;
  submitInfo.pCommandBuffers = &commandBuffer;

  vkQueueSubmit(s.vk_graphics_queue, 1, &submitInfo, VK_NULL_HANDLE);
  vkQueueWaitIdle(s.vk_graphics_queue);

  vkFreeCommandBuffers(s.vk_device, s.vk_command_pool, 1, &commandBuffer);
}



void
vulkan_create_vertex_buffer()
{
  VkDeviceSize bufferSize = sizeof(vertices[0]) * VERTICES_SIZE;

  VkBuffer stagingBuffer;
  VkDeviceMemory stagingBufferMemory;

  createBuffer(bufferSize,
               VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
               VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
               &stagingBuffer, &stagingBufferMemory);
  
  void* data;
  vkMapMemory(s.vk_device, stagingBufferMemory, 0, bufferSize, 0, &data);
  memcpy(data, vertices, (size_t) bufferSize);
  vkUnmapMemory(s.vk_device, stagingBufferMemory);

  createBuffer(bufferSize,
               VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
               VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
               &s.vk_vertex_buffer, &s.vk_vertex_buffer_memory);

  copyBuffer(stagingBuffer, s.vk_vertex_buffer, bufferSize);

  vkDestroyBuffer(s.vk_device, stagingBuffer, NULL);
  vkFreeMemory(s.vk_device, stagingBufferMemory, NULL);
}

void
vulkan_create_index_buffer()
{
  VkDeviceSize bufferSize = sizeof(indices[0]) * INDICES_SIZE;

  VkBuffer stagingBuffer;
  VkDeviceMemory stagingBufferMemory;

  createBuffer(bufferSize,
               VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
               VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
               &stagingBuffer, &stagingBufferMemory);
  
  void* data;
  vkMapMemory(s.vk_device, stagingBufferMemory, 0, bufferSize, 0, &data);
  memcpy(data, indices, (size_t) bufferSize);
  vkUnmapMemory(s.vk_device, stagingBufferMemory);

  createBuffer(bufferSize,
               VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_INDEX_BUFFER_BIT,
               VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
               &s.vk_index_buffer, &s.vk_index_buffer_memory);

  copyBuffer(stagingBuffer, s.vk_index_buffer, bufferSize);

  vkDestroyBuffer(s.vk_device, stagingBuffer, NULL);
  vkFreeMemory(s.vk_device, stagingBufferMemory, NULL);
}

void
vulkan_create_descriptor_set_layout()
{
  VkDescriptorSetLayoutBinding uboLayoutBinding = {0};
  uboLayoutBinding.binding = 0;
  uboLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
  uboLayoutBinding.descriptorCount = 1;
  uboLayoutBinding.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
  uboLayoutBinding.pImmutableSamplers = NULL; // optional

  VkDescriptorSetLayoutCreateInfo layoutInfo = {0};
  layoutInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
  layoutInfo.bindingCount = 1;
  layoutInfo.pBindings = &uboLayoutBinding;

  if (vkCreateDescriptorSetLayout(s.vk_device, &layoutInfo, NULL, &s.vk_descriptor_set_layout) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create descriptor set layout!\n");
  }
}

void
vulkan_create_uniform_buffers()
{
  VkDeviceSize bufferSize = sizeof(UniformBufferObject);

  for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
    createBuffer(bufferSize,
                 VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
                 VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
                 &s.vk_uniform_buffers[i], &s.vk_uniform_buffers_memory[i]);

    vkMapMemory(s.vk_device, s.vk_uniform_buffers_memory[i], 0, bufferSize, 0, &s.vk_uniform_buffers_mapped[i]);
  }
}

void
vulkan_create_descriptor_pool()
{
  VkDescriptorPoolSize poolSize = {0};
  poolSize.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
  poolSize.descriptorCount = MAX_FRAMES_IN_FLIGHT;

  VkDescriptorPoolCreateInfo poolInfo = {0};
  poolInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
  poolInfo.poolSizeCount = 1;
  poolInfo.pPoolSizes = &poolSize;
  poolInfo.maxSets = MAX_FRAMES_IN_FLIGHT;

  if (vkCreateDescriptorPool(s.vk_device, &poolInfo, NULL, &s.vk_descriptor_pool) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to create descriptor pool!\n");
  }

}

void
vulkan_create_descriptor_sets()
{
  VkDescriptorSetLayout layouts[MAX_FRAMES_IN_FLIGHT] = {0};

  for (int i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
    layouts[i] = s.vk_descriptor_set_layout;
  }

  VkDescriptorSetAllocateInfo allocInfo = {0};
  allocInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
  allocInfo.descriptorPool = s.vk_descriptor_pool;
  allocInfo.descriptorSetCount = MAX_FRAMES_IN_FLIGHT;
  allocInfo.pSetLayouts = layouts;

  if (vkAllocateDescriptorSets(s.vk_device, &allocInfo, s.vk_descriptor_sets) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to allocate descriptor sets!\n");
  }

  for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
    VkDescriptorBufferInfo bufferInfo = {0};
    bufferInfo.buffer = s.vk_uniform_buffers[i];
    bufferInfo.offset = 0;
    bufferInfo.range = sizeof(UniformBufferObject);

    VkWriteDescriptorSet descriptorWrite = {0};
    descriptorWrite.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
    descriptorWrite.dstSet = s.vk_descriptor_sets[i];
    descriptorWrite.dstBinding = 0;
    descriptorWrite.dstArrayElement = 0;
    descriptorWrite.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
    descriptorWrite.descriptorCount = 1;
    descriptorWrite.pBufferInfo = &bufferInfo;    
    descriptorWrite.pImageInfo = NULL; // Optional
    descriptorWrite.pTexelBufferView = NULL; // Optional

    vkUpdateDescriptorSets(s.vk_device, 1, &descriptorWrite, 0, NULL);
  }
}

void
init_vulkan()
{
  vk_log(VK_WARN, "====================================\n");
  vk_log(VK_WARN, "              DEBUG ON              \n");
  vk_log(VK_WARN, "====================================\n");

  vulkan_create_instance();
  // vulkan_setup_debug_messenger();
  vulkan_create_surface();
  vulkan_pick_physical_device();
  vulkan_create_logical_device();
  vulkan_create_swap_chain();
  vulkan_create_image_views();
  vulkan_create_render_pass();
  vulkan_create_descriptor_set_layout();
  vulkan_create_graphics_pipeline();
  vulkan_create_framebuffers();
  vulkan_create_command_pool();
  vulkan_create_vertex_buffer();
  vulkan_create_index_buffer();
  vulkan_create_uniform_buffers();
  vulkan_create_descriptor_pool();
  vulkan_create_descriptor_sets();
  vulkan_create_command_buffer();
  vulkan_create_sync_objects();
}

void
cleanupSwapChain()
{
  for (size_t i = 0; i < s.vk_swap_chain_image_count; i++) {
    vkDestroyFramebuffer(s.vk_device, s.vk_swap_chain_framebuffers[i], NULL);
  }
  for (uint32_t i = 0; i < s.vk_swap_chain_image_count; i++) {
    vkDestroyImageView(s.vk_device, s.vk_swap_chain_image_views[i], NULL);
  }
  vkDestroySwapchainKHR(s.vk_device, s.vk_swap_chain, NULL);
}

void
recreateSwapChain()
{
  vkDeviceWaitIdle(s.vk_device);

  cleanupSwapChain();

  vulkan_create_swap_chain();
  vulkan_create_image_views();
  vulkan_create_framebuffers();
}

void
close_vulkan()
{
  vkDeviceWaitIdle(s.vk_device);
  // Cleanup
  for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
    vkDestroySemaphore(s.vk_device, s.imageAvailableSemaphores[i], NULL);
    vkDestroySemaphore(s.vk_device, s.renderFinishedSemaphores[i], NULL);
    vkDestroyFence(s.vk_device, s.inFlightFences[i], NULL);
  }

  vkDestroyCommandPool(s.vk_device, s.vk_command_pool, NULL);

  cleanupSwapChain();

  for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
    vkDestroyBuffer(s.vk_device, s.vk_uniform_buffers[i], NULL);
    vkFreeMemory(s.vk_device, s.vk_uniform_buffers_memory[i], NULL);
  }
  vkDestroyDescriptorPool(s.vk_device, s.vk_descriptor_pool, NULL);
  vkDestroyDescriptorSetLayout(s.vk_device, s.vk_descriptor_set_layout, NULL);
  
  vkDestroyBuffer(s.vk_device, s.vk_vertex_buffer, NULL);
  vkFreeMemory(s.vk_device, s.vk_vertex_buffer_memory, NULL);

  vkDestroyBuffer(s.vk_device, s.vk_index_buffer, NULL);
  vkFreeMemory(s.vk_device, s.vk_index_buffer_memory, NULL);

  vkDestroyPipeline(s.vk_device, s.vk_graphics_pipeline, NULL);
  vkDestroyRenderPass(s.vk_device, s.vk_render_pass, NULL);
  vkDestroyPipelineLayout(s.vk_device, s.vk_pipeline_layout, NULL);
  vkDestroyDevice(s.vk_device, NULL);
  vkDestroySurfaceKHR(s.vk_instance, s.vk_surface, NULL);
  /* if (enableValidationLayers) { */
  /*   DestroyDebugUtilsMessengerEXT(s.vk_instance, s.vk_debug_messenger, NULL); */
  /* } */
  vkDestroyInstance(s.vk_instance, NULL);
}

float
current_time()
{
  static struct timespec startTime;
  static int isStartTimeInitialized = 0;
    
  if (!isStartTimeInitialized) {
    clock_gettime(CLOCK_MONOTONIC, &startTime);
    isStartTimeInitialized = 1;
  }

  struct timespec currentTime;
  clock_gettime(CLOCK_MONOTONIC, &currentTime);

  return (currentTime.tv_sec - startTime.tv_sec) + 
         (currentTime.tv_nsec - startTime.tv_nsec) / 1e9f;
}

void
updateUniformBuffer(uint32_t currentImage)
{

  float time = current_time();
  
  UniformBufferObject ubo = {0};
  glm_mat4_identity(ubo.model);
  glm_rotate(ubo.model, glm_rad(100 * time * glm_rad(90.0f)), GLM_ZUP);

  vec3 eye = {1.0f + s.x, 1.0f + s.x, 1.0f + s.x}; // GLM_VEC3_ONE_INIT;
  vec3 center = GLM_VEC3_ZERO_INIT;
  vec3 up = {0.0f,  0.0f,  1.0f};//GLM_ZUP;
  glm_lookat(eye, center, up, ubo.view);

  float aspect = s.vk_swap_chain_extent.width / (float)s.vk_swap_chain_extent.height;
  glm_perspective(glm_rad(55.0f - s.zoom ), aspect, 0.1f, 100.0f, ubo.proj);
    
  // Inverting the Y axis for Vulkan
  ubo.proj[1][1] *= -1;

  memcpy(s.vk_uniform_buffers_mapped[currentImage], &ubo, sizeof(ubo));
}

void
draw_frame() {
  vkWaitForFences(s.vk_device, 1, &s.inFlightFences[currentFrame], VK_TRUE, UINT64_MAX);

  uint32_t imageIndex;
  VkResult result = vkAcquireNextImageKHR(s.vk_device, s.vk_swap_chain, UINT64_MAX, s.imageAvailableSemaphores[currentFrame], VK_NULL_HANDLE, &imageIndex);

  if (result == VK_ERROR_OUT_OF_DATE_KHR) {
    recreateSwapChain();
    return;
  } else if (result != VK_SUCCESS && result != VK_SUBOPTIMAL_KHR) {
    vk_log(VK_ERROR, "failed to acquire swap chain image!\n");
  }

  updateUniformBuffer(currentFrame);

  vkResetFences(s.vk_device, 1, &s.inFlightFences[currentFrame]);

  vkResetCommandBuffer(s.vk_command_buffers[currentFrame], 0);
  recordCommandBuffer(s.vk_command_buffers[currentFrame], imageIndex);

  
  VkSubmitInfo submitInfo = {0};
  submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;

  VkSemaphore waitSemaphores[] = {s.imageAvailableSemaphores[currentFrame]};
  VkPipelineStageFlags waitStages[] = {VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT};
  submitInfo.waitSemaphoreCount = 1;
  submitInfo.pWaitSemaphores = waitSemaphores;
  submitInfo.pWaitDstStageMask = waitStages;
  submitInfo.commandBufferCount = 1;
  submitInfo.pCommandBuffers = &s.vk_command_buffers[currentFrame];

  VkSemaphore signalSemaphores[] = {s.renderFinishedSemaphores[currentFrame]};
  submitInfo.signalSemaphoreCount = 1;
  submitInfo.pSignalSemaphores = signalSemaphores;

  if (vkQueueSubmit(s.vk_graphics_queue, 1, &submitInfo, s.inFlightFences[currentFrame]) != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to submit draw command buffer!\n");
  }

  VkSwapchainKHR swapChains[] = {s.vk_swap_chain};
  VkPresentInfoKHR presentInfo = {0};
  presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
  presentInfo.waitSemaphoreCount = 1;
  presentInfo.pWaitSemaphores = signalSemaphores;
  presentInfo.swapchainCount = 1;
  presentInfo.pSwapchains = swapChains;
  presentInfo.pImageIndices = &imageIndex;
  presentInfo.pResults = NULL;

  result = vkQueuePresentKHR(s.vk_present_queue, &presentInfo);

  if (result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR) {
    recreateSwapChain();
  } else if (result != VK_SUCCESS) {
    vk_log(VK_ERROR, "failed to present swap chain image!\n");
  }

  currentFrame = (currentFrame + 1) % MAX_FRAMES_IN_FLIGHT;
}

int
main(int argc, char* args[])
{
  init_state(&s);
  if (!init()) {
    vk_log(VK_INFO, "Failed to initialize!\n");
  }
  else {
    init_vulkan();

    bool quit = false;

    
    /* VMA POC */
    /* VmaVulkanFunctions vulkanFunctions = {0}; */
    /* vulkanFunctions.vkGetInstanceProcAddr = &vkGetInstanceProcAddr; */
    /* vulkanFunctions.vkGetDeviceProcAddr = &vkGetDeviceProcAddr; */
 
    /* VmaAllocatorCreateInfo allocatorCreateInfo = {0}; */
    /* allocatorCreateInfo.flags = VMA_ALLOCATOR_CREATE_EXT_MEMORY_BUDGET_BIT; */
    /* allocatorCreateInfo.vulkanApiVersion = VK_API_VERSION_1_2; */
    /* allocatorCreateInfo.physicalDevice = s.vk_physical_device; */
    /* allocatorCreateInfo.device = s.vk_device; */
    /* allocatorCreateInfo.instance = s.vk_instance; */
    /* allocatorCreateInfo.pVulkanFunctions = &vulkanFunctions; */
 
    /* VmaAllocator allocator; */
    /* vmaCreateAllocator(&allocatorCreateInfo, &allocator); */
 
    /* // Entire program... */
 
    /* // At the end, don't forget to: */
    /* vmaDestroyAllocator(allocator); */

    // Game loop
    while (!quit) {
      handle_input(&quit);
      draw_frame();
      //SDL_Delay(16);
    }

    close_vulkan();
  }

  // Free resources and close SDL
  closeSDL();

  return 0;
}