spacegame/src/main.c

#define VK_USE_PLATFORM_MACOS_MVK
#include "vulkan/vulkan_core.h"
#include "vulkan/vk_enum_string_helper.h"

#define GLFW_INCLUDE_VULKAN
#include <GLFW/glfw3.h>
#define GLFW_EXPOSE_NATIVE_COCOA
#include <GLFW/glfw3native.h>

#define GLM_FORCE_RADIANS
#define GLM_FORCE_DEPTH_ZERO_TO_ONE
#include <cglm/types.h>
#include <cglm/mat4.h>
#include <cglm/vec3.h>
#include <cglm/affine.h>
#include <cglm/quat.h>
#include <cglm/cam.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <ply.h>
#include <map.h>
#include <gpu_mem.h>

typedef struct QueueStruct {
  VkQueue handle;
  uint32_t family;
  uint32_t index;
} Queue;

typedef struct SwapchainDetailsStruct {
  VkSurfaceCapabilitiesKHR capabilities;

  VkSurfaceFormatKHR* formats;
  uint32_t formats_count;

  VkPresentModeKHR* present_modes;
  uint32_t present_modes_count;
} SwapchainDetails;

typedef struct SwapchainImagesStruct {
  VkImage* images;
  uint32_t count;
} SwapchainImages;

typedef struct TextureStruct {
  GPUImage image;
  VkImageView view;
  VkSampler sampler;
} Texture;

typedef struct PositionStruct {
  vec3 position;
  vec3 scale;
  versor rotation;
} Position;

typedef void(*MappingFunc)(void*,void*);

void attribute_mapping_position_to_matrix(void* dest, void* source) {
  Position* position = source;
  glm_translate_make(dest, position->position);
  glm_quat_rotate(dest, position->rotation, dest);
  glm_scale(dest, position->scale);
}

#define MAPPING_POSITION_TO_MATRIX 0

MappingFunc mapping_functions[] = {
  attribute_mapping_position_to_matrix,
};

typedef struct MappingStruct {
  uint32_t mapping_type; // What function to use to map it
  uint32_t index; // Which index to use in the ATTRIBUTE_ID_DESCRIPTORS array
} Mapping;

#define ATTRIBUTE_ID_MESH            0x00000001 // Mesh*
#define ATTRIBUTE_ID_PIPELINE        0x00000002 // GraphicsPipeline*
#define ATTRIBUTE_ID_DESCRIPTORS     0x00000003 // void***(array of array of data pointers)
#define ATTRIBUTE_ID_DESCRIPTOR_SETS 0x00000004 // VkDescriptorSet*
#define ATTRIBUTE_ID_POSITION        0x00000005 // Position*
#define ATTRIBUTE_ID_PUSH_CONSTANTS  0x00000006 // void*

typedef struct ObjectStruct {
  Map      attributes;
} Object;

typedef struct MeshStruct {
  uint32_t vertex_count;
  GPUBuffer vertex_buffer;

  uint32_t index_count;
  GPUBuffer index_buffer;
} Mesh;

typedef struct GraphicsPipelineInfoStruct {
  VkDescriptorSetLayout scene_layout;
  VkDescriptorSetLayout set_layout;

  VkPipelineVertexInputStateCreateInfo input_info;

  uint32_t shader_stages_count;
  VkPipelineShaderStageCreateInfo* shader_stages;
} GraphicsPipelineInfo;

typedef struct GraphicsPipelineStruct {
  uint32_t max_frames_in_flight;
  uint32_t max_objects;

  VkDescriptorPool      descriptor_pool;
  VkDescriptorSet*      descriptors;

  VkPipelineLayout      layout;
  VkPipeline            pipeline;
  VkPipeline            offscreen_pipeline;
} GraphicsPipeline;

typedef struct VulkanContextStruct {
  VkInstance instance;
  VkDebugUtilsMessengerEXT debug_messenger;
  VkPhysicalDevice physical_device;

  VkDevice device;

  Queue graphics_queue;
  Queue transfer_queue;
  Queue present_queue;

  // G Buffer
  GPUPage* g_buffer_page;
  VkRenderPass g_renderpass;
  VkFramebuffer g_framebuffer;

  GPUImage g_image_position;
  GPUImage g_image_normal;
  GPUImage g_image_depth;

  VkImageView g_image_view_position;
  VkImageView g_image_view_normal;
  VkImageView g_image_view_depth;

  VkFormat g_image_format_position;
  VkFormat g_image_format_normal;
  VkFormat g_image_format_depth;


  // Present Swapchain
  VkSurfaceKHR surface;

  SwapchainDetails swapchain_details;
  VkSwapchainKHR swapchain;

  VkSurfaceFormatKHR swapchain_format;
  VkPresentModeKHR swapchain_present_mode;
  VkExtent2D swapchain_extent;

  uint32_t swapchain_image_count;
  // Per image objects
  VkImage* swapchain_images;
  VkImageView* swapchain_image_views;
  VkFramebuffer* swapchain_framebuffers;

  VkDeviceMemory depth_image_memory;
  VkImage depth_image;
  VkFormat depth_format;
  VkImageView depth_image_view;

  uint32_t max_frames_in_flight;

  // Per frame objects
  VkCommandBuffer* offscreen_command_buffers;
  VkCommandBuffer* swapchain_command_buffers;
  VkSemaphore* image_available_semaphores;
  VkSemaphore* render_finished_semaphores;
  VkSemaphore* offscreen_complete_semaphores;
  VkFence* in_flight_fences;

  VkRenderPass render_pass;

  VkCommandPool graphics_command_pool;
  VkCommandPool transfer_command_pool;

  uint32_t current_frame;

  VkPhysicalDeviceMemoryProperties memories;
  VkCommandPool extra_graphics_pool;
} VulkanContext;

typedef struct SceneContextStruct {
  VkDescriptorPool      pool;
  VkDescriptorSetLayout descriptor_layout;
  VkDescriptorSet*      descriptors;
  GPUBuffer*            ubos;
  void**                ubo_ptrs;
  uint32_t              pcr_size;
} SceneContext;

struct TextureVertex {
  vec3 pos;
  vec3 color;
  vec2 tex;
};

struct Vertex {
  vec3 pos;
  vec3 color;
};

struct SceneUBO {
  mat4 test;
};

struct ScenePC {
  mat4 view;
  mat4 proj;
};

const struct Vertex vertices[] = {
  {.pos = {-1.f, -1.f, 0.f}, .color = {1.0f, 0.0f, 0.0f}},
  {.pos = { 1.f, -1.f, 0.f}, .color = {0.0f, 1.0f, 0.0f}},
  {.pos = { 1.f,  1.f, 0.f}, .color = {0.0f, 0.0f, 1.0f}},
  {.pos = {-1.f,  1.f, 0.f}, .color = {1.0f, 1.0f, 1.0f}},
};

const struct TextureVertex texture_vertices[] = {
  {.pos = {-1.f, -1.f, 0.f}, .color = {1.0f, 0.0f, 0.0f}, .tex = {1.0f, 1.0f}},
  {.pos = { 1.f, -1.f, 0.f}, .color = {0.0f, 1.0f, 0.0f}, .tex = {0.0f, 1.0f}},
  {.pos = { 1.f,  1.f, 0.f}, .color = {0.0f, 0.0f, 1.0f}, .tex = {0.0f, 0.0f}},
  {.pos = {-1.f,  1.f, 0.f}, .color = {1.0f, 1.0f, 1.0f}, .tex = {1.0f, 0.0f}},
};

const uint16_t indices[] = {
  2, 1, 0, 0, 3, 2,
};

const char * validation_layers[] = {
  "VK_LAYER_KHRONOS_validation",
  //"VK_LAYER_LUNARG_api_dump",
  "VK_LAYER_KHRONOS_synchronization2",
  "VK_LAYER_KHRONOS_shader_object",
};
uint32_t validation_layer_count = sizeof(validation_layers) / sizeof(const char *);

const char * instance_extensions[] = {
  VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME,
  VK_EXT_DEBUG_UTILS_EXTENSION_NAME,
  "VK_EXT_metal_surface",
  VK_KHR_SURFACE_EXTENSION_NAME,
};
uint32_t instance_extension_count = sizeof(instance_extensions) / sizeof(const char *);

const char * device_extensions[] = {
  VK_KHR_SWAPCHAIN_EXTENSION_NAME,
  VK_EXT_DESCRIPTOR_INDEXING_EXTENSION_NAME,
  "VK_KHR_portability_subset",
};
uint32_t device_extension_count = sizeof(device_extensions) / sizeof(const char *);

void glfw_error(int error, const char* description) {
  fprintf(stderr, "GLFW_ERR: 0x%02x - %s\n", error, description);
}

GLFWwindow* init_window(int width, int height) {
  glfwInit();
  glfwSetErrorCallback(glfw_error);

  glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
  glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE);
  GLFWwindow* window = glfwCreateWindow(width, height, "Vulkan window", 0, 0);


  return window;
}

VkSemaphore* create_semaphores(VkDevice device, VkSemaphoreCreateFlags flags, uint32_t count) {
  VkSemaphore* semaphores = malloc(sizeof(VkSemaphore)*count);
  if(semaphores == 0) {
    return 0;
  }

  VkSemaphoreCreateInfo semaphore_info = {
    .sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO,
    .flags = flags,
  };

  for(uint32_t i = 0; i < count; i++) {
    VkResult result = vkCreateSemaphore(device, &semaphore_info, 0, &semaphores[i]);
    if(result != VK_SUCCESS) {
      free(semaphores);
      return 0;
    }
  }
  return semaphores;
}

VkFormat find_depth_format(VkPhysicalDevice physical_device, uint32_t num_requested, VkFormat* requested, VkImageTiling tiling, VkFormatFeatureFlags features) {
  for(uint32_t i = 0; i < num_requested; i++) {
    VkFormatProperties properties;
    vkGetPhysicalDeviceFormatProperties(physical_device, requested[i], &properties);

    if(tiling == VK_IMAGE_TILING_LINEAR && (properties.linearTilingFeatures & features) == features) {
      return requested[i];
    } else if (tiling == VK_IMAGE_TILING_OPTIMAL && (properties.optimalTilingFeatures & features) == features) {
      return requested[i];
    }
  }
  return VK_FORMAT_MAX_ENUM;
}

bool check_validation_layers(const char ** layers, uint32_t num_layers) {
  uint32_t layer_count;
  VkResult result;

  result = vkEnumerateInstanceLayerProperties(&layer_count, 0);
  if(result != VK_SUCCESS) {
    return false;
  }

  VkLayerProperties* available_layers = malloc(sizeof(VkLayerProperties)*layer_count);

  result = vkEnumerateInstanceLayerProperties(&layer_count, available_layers);

  for(uint32_t i = 0; i < num_layers; i++) {
    bool found = false;
    for(uint32_t j = 0; j < layer_count; j++) {
      if(strcmp(layers[i], available_layers[j].layerName) == 0) {
        found = true;
      }
    }
    if(found == false) {
      free(available_layers);
      return false;
    }
  }

  free(available_layers);
  return true;
}

static VKAPI_ATTR VkBool32 VKAPI_CALL debug_callback(
  VkDebugUtilsMessageSeverityFlagBitsEXT severity,
  VkDebugUtilsMessageTypeFlagsEXT type,
  const VkDebugUtilsMessengerCallbackDataEXT* callback_data,
  void* user_data) {

  (void)severity;
  (void)type;
  (void)user_data;

  fprintf(stderr, "Validation layer: %s\n", callback_data->pMessage);

  return VK_FALSE;
}

VkDescriptorSet* create_descriptor_sets(VkDevice device, VkDescriptorSetLayout layout, VkDescriptorPool pool, uint32_t count) {
  VkDescriptorSetLayout* layouts = malloc(sizeof(VkDescriptorSetLayout)*count);
  if(layouts == 0) {
    return 0;
  }

  VkDescriptorSet* sets = malloc(sizeof(VkDescriptorSet)*count);
  if(sets == 0) {
    free(layouts);
    return 0;
  }

  for(uint32_t i = 0; i < count; i++) {
    layouts[i] = layout;
  }

  VkDescriptorSetAllocateInfo alloc_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
    .descriptorPool = pool,
    .descriptorSetCount = count,
    .pSetLayouts = layouts,
  };

  VkResult result = vkAllocateDescriptorSets(device, &alloc_info, sets);
  free(layouts);
  if(result != VK_SUCCESS) {
    free(sets);
    return 0;
  }


  return sets;
}

VkResult get_best_physical_device(VkInstance instance, VkPhysicalDevice* device) {
  uint32_t device_count = 0;
  VkResult result;
  result = vkEnumeratePhysicalDevices(instance, &device_count, 0);
  if(result != VK_SUCCESS) {
    return result;
  }

  VkPhysicalDevice* devices = malloc(sizeof(VkPhysicalDevice)*device_count);
  result = vkEnumeratePhysicalDevices(instance, &device_count, devices);
  if(result != VK_SUCCESS) {
    free(devices);
    return result;
  }

  int top_score = -1;
  for(uint32_t i = 0; i < device_count; i++) {
    int score = 0;

    VkPhysicalDeviceProperties properties;
    vkGetPhysicalDeviceProperties(devices[i], &properties);
    fprintf(stderr, "%d\n", properties.limits.maxPerStageResources);

    VkPhysicalDeviceFeatures features;
    vkGetPhysicalDeviceFeatures(devices[i], &features);

    switch(properties.deviceType) {
    case VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU:
      score += 100;
      break;
    case VK_PHYSICAL_DEVICE_TYPE_VIRTUAL_GPU:
      score += 50;
      break;
    case VK_PHYSICAL_DEVICE_TYPE_INTEGRATED_GPU:
      score += 25;
      break;
    case VK_PHYSICAL_DEVICE_TYPE_CPU:
      score += 0;
      break;
    default:
      continue;
    }

    if(score > top_score) {
      top_score = score;
      *device = devices[i];
    }
  }

  free(devices);

  return VK_SUCCESS;
}

VkResult create_debug_messenger(VkInstance instance, VkDebugUtilsMessengerEXT* debug_messenger) {
  VkDebugUtilsMessengerCreateInfoEXT messenger_info = {
    .sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT,
    .messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT,
    .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 | VK_DEBUG_UTILS_MESSAGE_TYPE_DEVICE_ADDRESS_BINDING_BIT_EXT,
    .pfnUserCallback = debug_callback,
    .pUserData = 0,
  };

  PFN_vkCreateDebugUtilsMessengerEXT func = (PFN_vkCreateDebugUtilsMessengerEXT)vkGetInstanceProcAddr(instance, "vkCreateDebugUtilsMessengerEXT");

  VkResult result;
  result = func(instance, &messenger_info, 0, debug_messenger);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create debug messenger\n");
    return result;
  }

  return VK_SUCCESS;
}

VkResult create_instance(VkInstance* instance) {
  if(instance == NULL) {
    return VK_ERROR_VALIDATION_FAILED_EXT;
  }

  if(check_validation_layers(validation_layers, validation_layer_count) == false) {
    fprintf(stderr, "requested validation layers not supported");
    return VK_ERROR_VALIDATION_FAILED_EXT;
  }

  VkApplicationInfo app_info = {
    .sType = VK_STRUCTURE_TYPE_APPLICATION_INFO,
    .pApplicationName = "spacegame",
    .applicationVersion = VK_MAKE_VERSION(0, 0, 1),
    .pEngineName = "spacegame",
    .engineVersion = VK_MAKE_VERSION(0, 0, 1),
    .apiVersion = VK_API_VERSION_1_2,
  };

  uint32_t glfwExtensionCount = 0;
  const char** glfwExtensions;

  glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);

  const char** requested_extensions = malloc(sizeof(char*)*(glfwExtensionCount + instance_extension_count));
  for (uint32_t i = 0; i < glfwExtensionCount; i++) {
    requested_extensions[i] = glfwExtensions[i];
  }

  for (uint32_t i = 0; i < instance_extension_count; i++) {
    requested_extensions[glfwExtensionCount + i] = instance_extensions[i];
  }

  VkInstanceCreateInfo instance_info = {
    .sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
    .pApplicationInfo = &app_info,
    .enabledLayerCount = validation_layer_count,
    .ppEnabledLayerNames = validation_layers,
    .enabledExtensionCount = glfwExtensionCount + instance_extension_count,
    .ppEnabledExtensionNames = requested_extensions,
    .flags = VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR,
  };



  VkResult result = vkCreateInstance(&instance_info, 0, instance);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "vkCreateInstance: %s\n", string_VkResult(result));
    return result;
  }

  free(requested_extensions);
  return VK_SUCCESS;
}

VkResult create_logical_device(VkPhysicalDevice physical_device, VkSurfaceKHR surface, Queue* graphics_queue, Queue* present_queue, Queue* transfer_queue, VkDevice* device) {
  if(graphics_queue == NULL || present_queue == NULL || transfer_queue == NULL || device == NULL) {
    return VK_ERROR_VALIDATION_FAILED_EXT;
  }

  uint32_t queue_family_count = 0;
  vkGetPhysicalDeviceQueueFamilyProperties(physical_device, &queue_family_count, NULL);

  VkQueueFamilyProperties* queue_families = malloc(sizeof(VkQueueFamilyProperties)*queue_family_count);
  vkGetPhysicalDeviceQueueFamilyProperties(physical_device, &queue_family_count, queue_families);

  graphics_queue->family = 0xFFFFFFFF;
  present_queue->family = 0xFFFFFFFF;
  for(uint32_t idx = 0; idx < queue_family_count; idx++) {
    VkBool32 present_support = VK_FALSE;
    vkGetPhysicalDeviceSurfaceSupportKHR(physical_device, idx, surface, &present_support);
    VkBool32 graphics_support = (queue_families[idx].queueFlags & VK_QUEUE_GRAPHICS_BIT);

    if(graphics_support && present_support) {
      graphics_queue->family = idx;
      graphics_queue->index = 0;

      present_queue->family = idx;
      present_queue->index = 0;
      break;
    } else if (graphics_support && (graphics_queue->family == 0xFFFFFFFF)) {
      graphics_queue->family = idx;
      graphics_queue->index = 0;
    } else if (present_support && (present_queue->family == 0xFFFFFFFF)) {
      graphics_queue->family = idx;
      present_queue->index = 0;
    }
  }

  transfer_queue->family = 0xFFFFFFFF;
  for(uint32_t idx = 0; idx < queue_family_count; idx++) {
    VkBool32 graphics_support = (queue_families[idx].queueFlags & VK_QUEUE_GRAPHICS_BIT);
    VkBool32 compute_support = (queue_families[idx].queueFlags & VK_QUEUE_COMPUTE_BIT);
    VkBool32 is_graphics_family = (graphics_queue->family == idx);
    VkBool32 is_present_family = (present_queue->family == idx);
    uint32_t queue_count = queue_families[idx].queueCount;

    if(is_graphics_family && (queue_count == 1)) {
      continue;
    } else if (is_present_family && (queue_count == 1)) {
      continue;
    }

    if(graphics_support && compute_support) {
      transfer_queue->family = idx;
      if(is_graphics_family || is_present_family) {
        transfer_queue->index = 1;
      } else {
        transfer_queue->index = 0;
      }
    }
  }

  if(graphics_queue->family == 0xFFFFFFFF || present_queue->family == 0xFFFFFFFF || transfer_queue->family == 0xFFFFFFFF) {
    return VK_ERROR_INITIALIZATION_FAILED;
  }

  uint32_t family_indices[] = {
    transfer_queue->family,
    graphics_queue->family,
    present_queue->family,
  };

  VkDeviceQueueCreateInfo queue_create_info[3] = {};
  float default_queue_priority = 1.0f;
  for(uint32_t i = 0; i < 3; i++) {
    queue_create_info[i].sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
    queue_create_info[i].queueFamilyIndex = family_indices[i];
    queue_create_info[i].queueCount = 1; 
    queue_create_info[i].pQueuePriorities = &default_queue_priority;
  }

  VkPhysicalDeviceVulkan12Features features_12 = {
    .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_1_2_FEATURES,
    .bufferDeviceAddress = VK_TRUE,
    .descriptorIndexing = VK_TRUE,
    .descriptorBindingPartiallyBound = VK_TRUE,
    .descriptorBindingVariableDescriptorCount = VK_TRUE,
    .descriptorBindingUniformBufferUpdateAfterBind = VK_TRUE,
    .descriptorBindingStorageBufferUpdateAfterBind = VK_TRUE,
    .descriptorBindingSampledImageUpdateAfterBind = VK_TRUE,
  };

  VkPhysicalDeviceFeatures device_features = {
    .samplerAnisotropy = VK_TRUE,
  };

  VkDeviceCreateInfo device_create_info = {
    .sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO,
    .pQueueCreateInfos = queue_create_info,
    .queueCreateInfoCount = 3,
    .pEnabledFeatures = &device_features,
    .enabledExtensionCount = device_extension_count,
    .ppEnabledExtensionNames = device_extensions,
    .enabledLayerCount = validation_layer_count,
    .ppEnabledLayerNames = validation_layers,
    .pNext = &features_12,
  };

  VkResult result = vkCreateDevice(physical_device, &device_create_info, 0, device);
  if(result != VK_SUCCESS) {
    return result;
  }

  vkGetDeviceQueue(*device, graphics_queue->family, graphics_queue->index, &graphics_queue->handle);
  vkGetDeviceQueue(*device, present_queue->family, present_queue->index, &present_queue->handle);
  vkGetDeviceQueue(*device, transfer_queue->family, transfer_queue->index, &transfer_queue->handle);

  return VK_SUCCESS;
}

VkResult get_swapchain_details(VkPhysicalDevice physical_device, VkSurfaceKHR surface, SwapchainDetails* details) {
  details->formats = 0;
  details->present_modes = 0;

  VkResult result;

  result = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_device, surface, &details->capabilities);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device, surface, &details->formats_count, 0);
  if(result != VK_SUCCESS) {
    return result;
  }
  details->formats = malloc(sizeof(VkSurfaceFormatKHR)*details->formats_count);
  result = vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device, surface, &details->formats_count, details->formats);
  if(result != VK_SUCCESS) {
    free(details->formats);
    return result;
  }

  result = vkGetPhysicalDeviceSurfacePresentModesKHR(physical_device, surface, &details->present_modes_count, 0);
  if(result != VK_SUCCESS) {
    free(details->formats);
    return result;
  }
  details->present_modes = malloc(sizeof(VkPresentModeKHR)*details->present_modes_count);
  result = vkGetPhysicalDeviceSurfacePresentModesKHR(physical_device, surface, &details->present_modes_count, details->present_modes);
  if(result != VK_SUCCESS) {
    free(details->formats);
    free(details->present_modes);
    return result;
  }

  return VK_SUCCESS;
}

VkSurfaceFormatKHR choose_swapchain_format(SwapchainDetails swapchain_details) {
  for(uint32_t i = 0; i < swapchain_details.formats_count; i++) {
    VkSurfaceFormatKHR format = swapchain_details.formats[i];
    if(format.format == VK_FORMAT_B8G8R8A8_SRGB && format.colorSpace == VK_COLOR_SPACE_SRGB_NONLINEAR_KHR) {
      return format;
    }
  }
  return swapchain_details.formats[0];
}

VkPresentModeKHR choose_present_mode(SwapchainDetails swapchain_details) {
  for(uint32_t i = 0; i < swapchain_details.present_modes_count; i++) {
    if(swapchain_details.present_modes[i] == VK_PRESENT_MODE_MAILBOX_KHR) {
      return VK_PRESENT_MODE_MAILBOX_KHR;
    }
  }

  return VK_PRESENT_MODE_FIFO_KHR;
}

VkExtent2D choose_swapchain_extent(SwapchainDetails swapchain_details) {
  return swapchain_details.capabilities.currentExtent;
}

VkSwapchainKHR create_swapchain(VkDevice device, VkSurfaceFormatKHR format, VkPresentModeKHR present_mode, VkExtent2D extent, VkSurfaceKHR surface, VkSurfaceCapabilitiesKHR capabilities, uint32_t graphics_family_index, uint32_t present_family_index, VkSwapchainKHR old_swapchain) {
  uint32_t image_count = capabilities.minImageCount + 1;
  uint32_t max_images = capabilities.maxImageCount;
  if((max_images > 0) && (image_count > max_images)) {
    image_count = max_images;
  }

  VkSwapchainCreateInfoKHR swapchain_info = {
    .sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR,
    .surface = surface,
    .minImageCount = image_count,
    .imageFormat = format.format,
    .imageColorSpace = format.colorSpace,
    .imageExtent = extent,
    .imageArrayLayers = 1,
    .imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
    .preTransform = capabilities.currentTransform,
    .compositeAlpha = VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR,
    .presentMode = present_mode,
    .clipped = VK_TRUE,
    .oldSwapchain = old_swapchain,
  };

  uint32_t queue_families[2] = {graphics_family_index, present_family_index};
  if(graphics_family_index != present_family_index) {
    swapchain_info.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
    swapchain_info.queueFamilyIndexCount = 2;
    swapchain_info.pQueueFamilyIndices = queue_families;
  } else {
    swapchain_info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
    swapchain_info.queueFamilyIndexCount = 0;
    swapchain_info.pQueueFamilyIndices = 0;
  }


  VkSwapchainKHR swapchain;
  VkResult result;
  result = vkCreateSwapchainKHR(device, &swapchain_info, 0, &swapchain);
  if(result != VK_SUCCESS) {
    return VK_NULL_HANDLE;
  }

  return swapchain;
}

SwapchainImages get_swapchain_images(VkDevice device, VkSwapchainKHR swapchain) {
  SwapchainImages images = {
    .images = NULL,
    .count = 0,
  };

  VkResult result;
  result = vkGetSwapchainImagesKHR(device, swapchain, &images.count, 0);
  if(result != VK_SUCCESS) {
    images.count = 0;
    return images;
  }

  images.images = malloc(sizeof(VkImage)*images.count);
  if(images.images == 0) {
    images.count = 0;
    return images;
  }

  result = vkGetSwapchainImagesKHR(device, swapchain, &images.count, images.images);
  if(result != VK_SUCCESS) {
    images.count = 0;
    return images;
  }

  return images;
}

VkImageView* create_image_views(VkDevice device, uint32_t image_count, VkImage* images, VkSurfaceFormatKHR format) {
  VkImageView* image_views = malloc(sizeof(VkImageView)*image_count);
  if(image_views == 0) {
    return 0;
  }

  for(uint32_t i = 0; i < image_count; i++) {
    VkImageViewCreateInfo view_info = {
      .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
      .image = images[i],
      .viewType = VK_IMAGE_VIEW_TYPE_2D,
      .format = format.format,
      .components = {
        .r = VK_COMPONENT_SWIZZLE_IDENTITY,
        .g = VK_COMPONENT_SWIZZLE_IDENTITY,
        .b = VK_COMPONENT_SWIZZLE_IDENTITY,
        .a = VK_COMPONENT_SWIZZLE_IDENTITY,
      },
      .subresourceRange = {
        .aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
        .baseMipLevel = 0,
        .levelCount = 1,
        .baseArrayLayer = 0,
        .layerCount = 1,
      },
    };

    VkResult result = vkCreateImageView(device, &view_info, 0, &image_views[i]);
    if(result != VK_SUCCESS) {
      free(image_views);
      return 0;
    }
  }

  return image_views;
}

VkFramebuffer* create_swapchain_framebuffers(VkDevice device, uint32_t image_count, VkImageView* image_views, VkImageView depth_image_view, VkRenderPass render_pass, VkExtent2D extent) {
  VkFramebuffer* framebuffers = malloc(sizeof(VkFramebuffer)*image_count);
  if(framebuffers == 0) {
    return 0;
  }

  for(uint32_t i = 0; i < image_count; i++) {
    VkImageView attachments[] = {
      image_views[i],
      depth_image_view,
    };

    VkFramebufferCreateInfo framebuffer_info = {
      .sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,
      .renderPass = render_pass,
      .attachmentCount = 2,
      .pAttachments = attachments,
      .width = extent.width,
      .height = extent.height,
      .layers = 1,
    };

    VkResult result = vkCreateFramebuffer(device, &framebuffer_info, 0, &framebuffers[i]);
    if(result != VK_SUCCESS) {
      free(framebuffers);
      return 0;
    }
  }

  return framebuffers;
}

VkShaderModule create_shader_module(VkDevice device, const char * code, uint32_t code_size) {
  VkShaderModuleCreateInfo shader_info = {
    .sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO,
    .codeSize = code_size,
    .pCode = (uint32_t*)code,
  };

  VkShaderModule shader;
  VkResult result;
  result = vkCreateShaderModule(device, &shader_info, 0, &shader);
  if(result != VK_SUCCESS) {
    return VK_NULL_HANDLE;
  }

  return shader;
}

VkShaderModule load_shader_file(const char* path, VkDevice device) {
  FILE* file;
  file = fopen(path, "rb");
  if(file == 0) {
    return VK_NULL_HANDLE;
  }

  int result = fseek(file, 0, SEEK_END);
  if(result != 0) {
    return VK_NULL_HANDLE;
  }

  long buffer_size = ftell(file);

  result = fseek(file, 0, SEEK_SET);
  if(result != 0) {
    return VK_NULL_HANDLE;
  }

  char * buffer = malloc(buffer_size);
  if(buffer == 0) {
    return VK_NULL_HANDLE;
  }

  size_t read = fread(buffer, 1, buffer_size, file);

  VkShaderModule shader = create_shader_module(device, buffer, read);
  free(buffer);
  return shader;
}

VkRenderPass create_render_pass(VkDevice device, VkSurfaceFormatKHR format, VkFormat depth_format) {
  VkAttachmentDescription attachments[] = {
    {
      .format = format.format,
      .samples = VK_SAMPLE_COUNT_1_BIT,
      .loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR,
      .storeOp = VK_ATTACHMENT_STORE_OP_STORE,
      .stencilLoadOp = VK_ATTACHMENT_LOAD_OP_CLEAR,
      .stencilStoreOp = VK_ATTACHMENT_STORE_OP_STORE,
      .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
      .finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,
    },
    {
      .format = depth_format,
      .samples = VK_SAMPLE_COUNT_1_BIT,
      .loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR,
      .storeOp = VK_ATTACHMENT_STORE_OP_DONT_CARE,
      .stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE,
      .stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE,
      .initialLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL,
      .finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL,
    },
  };

  VkAttachmentReference color_attachment_refs[] = {
    {
      .attachment = 0,
      .layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
    },
  };

  VkAttachmentReference depth_attachment_ref = {
    .attachment = 1,
    .layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL,
  };

  // Create a subpass with the color and depth attachments
  VkSubpassDescription subpasses[] = {
    {
      .pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS,
      .colorAttachmentCount = sizeof(color_attachment_refs)/sizeof(VkAttachmentReference),
      .pColorAttachments = color_attachment_refs,
      .pDepthStencilAttachment = &depth_attachment_ref,
    },
  };

  // This basically says "make sure nothing else is writing to the depth_stencil or the color attachment during the pipeline
  VkSubpassDependency dependencies[] = {
    {
      .srcSubpass = VK_SUBPASS_EXTERNAL,
      .dstSubpass = 0,
      .srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT | VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT,
      .srcAccessMask = 0,
      .dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT | VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT,
      .dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT,
      .dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT,
    }
  };

  VkRenderPassCreateInfo render_info = {
    .sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
    .attachmentCount = sizeof(attachments)/sizeof(VkAttachmentDescription),
    .pAttachments = attachments,
    .subpassCount = sizeof(subpasses)/sizeof(VkSubpassDescription),
    .pSubpasses = subpasses,
    .dependencyCount = sizeof(dependencies)/sizeof(VkSubpassDependency),
    .pDependencies = dependencies,
  };

  VkRenderPass render_pass;
  VkResult result = vkCreateRenderPass(device, &render_info, 0, &render_pass);
  if(result != VK_SUCCESS) {
    return VK_NULL_HANDLE;
  }

  return render_pass;
}

VkCommandBuffer command_begin_single(VkDevice device, VkCommandPool transfer_pool) {
  VkCommandBufferAllocateInfo command_info = {
    .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,
    .level = VK_COMMAND_BUFFER_LEVEL_PRIMARY,
    .commandPool = transfer_pool,
    .commandBufferCount = 1,
  };

  VkCommandBuffer command_buffer;
  VkResult result = vkAllocateCommandBuffers(device, &command_info, &command_buffer);
  if(result != VK_SUCCESS) {
    return VK_NULL_HANDLE;
  }

  VkCommandBufferBeginInfo begin_info = {
    .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO,
    .flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT,
  };

  result = vkBeginCommandBuffer(command_buffer, &begin_info);
  if(result != VK_SUCCESS) {
    vkFreeCommandBuffers(device, transfer_pool, 1, &command_buffer);
    return VK_NULL_HANDLE;
  }

  return command_buffer;
}

VkResult command_end_single(VkDevice device, VkCommandBuffer command_buffer, VkCommandPool transfer_pool, Queue transfer_queue) {
  VkResult result = vkEndCommandBuffer(command_buffer);
  if(result != VK_SUCCESS) {
    vkFreeCommandBuffers(device, transfer_pool, 1, &command_buffer);
    return result;
  }

  VkSubmitInfo submit_info = {
    .sType = VK_STRUCTURE_TYPE_SUBMIT_INFO,
    .commandBufferCount = 1,
    .pCommandBuffers = &command_buffer,
  };

  result = vkQueueSubmit(transfer_queue.handle, 1, &submit_info, 0);
  if(result != VK_SUCCESS) {
    vkFreeCommandBuffers(device, transfer_pool, 1, &command_buffer);
    return result;
  }

  result = vkQueueWaitIdle(transfer_queue.handle);
  vkFreeCommandBuffers(device, transfer_pool, 1, &command_buffer);
  return result;
}

VkResult command_transition_image_layout(VkDevice device, VkCommandPool transfer_pool, Queue transfer_queue, VkImageLayout old_layout, VkImageLayout new_layout, VkImage image, VkAccessFlags src_mask, VkAccessFlags dst_mask, VkPipelineStageFlags source, VkPipelineStageFlags dest, uint32_t source_family, uint32_t dest_family, VkImageAspectFlags aspect_flags) {
  VkCommandBuffer command_buffer = command_begin_single(device, transfer_pool);

  VkImageMemoryBarrier barrier = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
    .oldLayout = old_layout,
    .newLayout = new_layout,
    .srcQueueFamilyIndex = source_family,
    .dstQueueFamilyIndex = dest_family,
    .image = image,
    .subresourceRange = {
      .aspectMask = aspect_flags,
      .levelCount = 1,
      .layerCount = 1,
      .baseMipLevel = 0,
      .baseArrayLayer = 0,
    },
    .srcAccessMask = src_mask,
    .dstAccessMask = dst_mask,
  };
  vkCmdPipelineBarrier(command_buffer, source, dest, 0, 0, 0, 0, 0, 1, &barrier);

  return command_end_single(device, command_buffer, transfer_pool, transfer_queue);
}

VkResult command_copy_buffer_to_image(VkDevice device, VkCommandPool transfer_pool, Queue transfer_queue, VkExtent3D image_size, VkBuffer source, VkImage dest) {
  VkCommandBuffer command_buffer = command_begin_single(device, transfer_pool);

  VkBufferImageCopy region = {
    .bufferOffset = 0,
    .bufferRowLength = 0,
    .bufferImageHeight = 0,
    .imageSubresource = {
      .baseArrayLayer = 0,
      .layerCount = 1,
      .mipLevel = 0,
      .aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
    },
    .imageOffset = {
      .x = 0,
      .y = 0,
      .z = 0,
    },
    .imageExtent = image_size,
  };

  vkCmdCopyBufferToImage(command_buffer, source, dest, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &region);

  return command_end_single(device, command_buffer, transfer_pool, transfer_queue);
}

Texture load_texture(VkDevice device, GPUPage* page, GPUBuffer staging, VkCommandPool transfer_pool, Queue transfer_queue, VkCommandPool graphics_pool, Queue graphics_queue, VkExtent2D size, VkFormat format, void* image_data){
  Texture ret = {
    .image.page = NULL,
    .image.memory = NULL,
    .image.handle = VK_NULL_HANDLE,
    .view = VK_NULL_HANDLE,
  };

  VkExtent3D full_extent = {
    .width = size.width,
    .height = size.height,
    .depth = 1,
  };

  VkImageCreateInfo info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
    .imageType = VK_IMAGE_TYPE_2D,
    .extent = full_extent,
    .mipLevels = 1,
    .arrayLayers = 1,
    .format = format,
    .tiling = VK_IMAGE_TILING_OPTIMAL,
    .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
    .usage = VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT,
    .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
    .samples = VK_SAMPLE_COUNT_1_BIT,
    .flags = 0,
  };

  GPUImage image = {0};
  VkResult result = gpu_image_malloc(device, page, &info, &image);
  if(result != VK_SUCCESS) {
    return ret;
  }

  memcpy(staging.page->ptr + staging.memory->offset, image_data, image.memory->size);

  result = command_transition_image_layout(device, transfer_pool, transfer_queue, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, image.handle, 0, VK_ACCESS_TRANSFER_WRITE_BIT, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, transfer_queue.family, transfer_queue.family, VK_IMAGE_ASPECT_COLOR_BIT);
  if(result != VK_SUCCESS) {
    gpu_image_free(device, image);
    return ret;
  }

  result = command_copy_buffer_to_image(device, transfer_pool, transfer_queue, full_extent, staging.handle, image.handle);
  if(result != VK_SUCCESS) {
    gpu_image_free(device, image);
    return ret;
  }

  result = command_transition_image_layout(device, transfer_pool, transfer_queue, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL, image.handle, VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_SHADER_READ_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, transfer_queue.family, graphics_queue.family, VK_IMAGE_ASPECT_COLOR_BIT);
  if(result != VK_SUCCESS) {
    gpu_image_free(device, image);
    return ret;
  }

  result = command_transition_image_layout(device, graphics_pool, graphics_queue, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL, image.handle, VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_SHADER_READ_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, transfer_queue.family, graphics_queue.family, VK_IMAGE_ASPECT_COLOR_BIT);
  if(result != VK_SUCCESS) {
    gpu_image_free(device, image);
    return ret;
  }

  VkImageView view;
  VkImageViewCreateInfo view_info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
    .image = image.handle,
    .viewType = VK_IMAGE_VIEW_TYPE_2D,
    .components = {
      .a = VK_COMPONENT_SWIZZLE_IDENTITY,
      .b = VK_COMPONENT_SWIZZLE_IDENTITY,
      .g = VK_COMPONENT_SWIZZLE_IDENTITY,
      .r = VK_COMPONENT_SWIZZLE_IDENTITY,
    },
    .format = format,
    .subresourceRange = {
      .aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
      .layerCount = 1,
      .levelCount = 1,
      .baseArrayLayer = 0,
      .baseMipLevel = 0,
    },
  };

  result = vkCreateImageView(device, &view_info, 0, &view);
  if(result != VK_SUCCESS) {
    gpu_image_free(device, image);
    return ret;
  }

  VkSampler sampler;
  VkSamplerCreateInfo sampler_info = {
    .sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
    .magFilter = VK_FILTER_NEAREST,
    .minFilter = VK_FILTER_NEAREST,
    .addressModeU = VK_SAMPLER_ADDRESS_MODE_REPEAT,
    .addressModeV = VK_SAMPLER_ADDRESS_MODE_REPEAT,
    .addressModeW = VK_SAMPLER_ADDRESS_MODE_REPEAT,
    .anisotropyEnable = VK_FALSE,
    .maxAnisotropy = 2.0f,
    .borderColor = VK_BORDER_COLOR_INT_OPAQUE_BLACK,
    .unnormalizedCoordinates = VK_FALSE,
    .compareEnable = VK_FALSE,
    .compareOp = VK_COMPARE_OP_ALWAYS,
    .mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR,
    .mipLodBias = 0.0f,
    .minLod = 0.0f,
    .maxLod = 0.0f,
  };

  result = vkCreateSampler(device, &sampler_info, 0, &sampler);
  if(result != VK_SUCCESS) {
    gpu_image_free(device, image);
    vkDestroyImageView(device, view, 0);
    return ret;
  }

  ret.image = image;
  ret.view = view;
  ret.sampler = sampler;
  return ret;
}

int create_depth_image(VulkanContext* context) {
  VkExtent3D depth_extent = {
    .width = context->swapchain_extent.width,
    .height = context->swapchain_extent.height,
    .depth = 1,
  };

  VkImageCreateInfo depth_image_info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
    .imageType = VK_IMAGE_TYPE_2D,
    .extent = depth_extent,
    .mipLevels = 1,
    .arrayLayers = 1,
    .format = context->depth_format,
    .tiling = VK_IMAGE_TILING_OPTIMAL,
    .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
    .usage = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT | VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT,
    .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
    .samples = VK_SAMPLE_COUNT_1_BIT,
    .flags = 0,
  };

  VkImage depth_image;
  VkResult result = vkCreateImage(context->device, &depth_image_info, 0, &depth_image);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create depth image\n");
    return 1;
  } else {
    context->depth_image = depth_image;
  }

  VkMemoryRequirements depth_image_requirements;
  vkGetImageMemoryRequirements(context->device, context->depth_image, &depth_image_requirements);

  VkMemoryAllocateInfo depth_memory_info = {
    .sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
    .allocationSize = depth_image_requirements.size,
    .memoryTypeIndex = pick_memory(context->memories, depth_image_requirements.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT, 0).index,
  };

  VkDeviceMemory depth_image_memory;
  result = vkAllocateMemory(context->device, &depth_memory_info, 0, &depth_image_memory);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to allocate memory for depth image\n");
    return 2;
  } else {
    context->depth_image_memory = depth_image_memory;
  }

  result = vkBindImageMemory(context->device, context->depth_image, context->depth_image_memory, 0);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to bind memory for depth image\n");
    return 3;
  }

  VkImageViewCreateInfo depth_view_info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
    .image = context->depth_image,
    .viewType = VK_IMAGE_VIEW_TYPE_2D,
    .format = context->depth_format,
    .components = {
      .r = VK_COMPONENT_SWIZZLE_IDENTITY,
      .g = VK_COMPONENT_SWIZZLE_IDENTITY,
      .b = VK_COMPONENT_SWIZZLE_IDENTITY,
      .a = VK_COMPONENT_SWIZZLE_IDENTITY,
    },
    .subresourceRange = {
      .aspectMask = VK_IMAGE_ASPECT_DEPTH_BIT,
      .baseMipLevel = 0,
      .levelCount = 1,
      .baseArrayLayer = 0,
      .layerCount = 1,
    },
  };

  VkImageView depth_image_view;
  result = vkCreateImageView(context->device, &depth_view_info, 0, &depth_image_view);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create vulkan depth image view\n");
    return 4;
  } else {
    context->depth_image_view = depth_image_view;
  }

  result = command_transition_image_layout(context->device, context->extra_graphics_pool, context->graphics_queue, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_OPTIMAL, context->depth_image, 0, VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT, VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED, VK_IMAGE_ASPECT_DEPTH_BIT);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to transition depth image\n");
    return 5;
  }

  return 0;
}

VkResult recreate_swapchain(VulkanContext* context) {
  for(uint32_t i = 0; i < context->swapchain_image_count; i++) {
    vkDestroyFramebuffer(context->device, context->swapchain_framebuffers[i], 0);
    vkDestroyImageView(context->device, context->swapchain_image_views[i], 0);
  }

  for(uint32_t i = 0; i < context->max_frames_in_flight; i++) {
    vkDestroySemaphore(context->device, context->image_available_semaphores[i], 0);
  }

  free(context->swapchain_image_views);
  free(context->swapchain_framebuffers);
  free(context->swapchain_details.formats);
  free(context->swapchain_details.present_modes);

  vkDestroyImageView(context->device, context->depth_image_view, 0);
  vkDestroyImage(context->device, context->depth_image, 0);
  vkFreeMemory(context->device, context->depth_image_memory, 0);

  VkResult result = get_swapchain_details(context->physical_device, context->surface, &context->swapchain_details);
  if(result != VK_SUCCESS) {
    return result;
  }

  context->swapchain_format = choose_swapchain_format(context->swapchain_details);
  context->swapchain_present_mode = choose_present_mode(context->swapchain_details);
  context->swapchain_extent = choose_swapchain_extent(context->swapchain_details);

  create_depth_image(context);

  VkSwapchainKHR swapchain = create_swapchain(context->device, context->swapchain_format, context->swapchain_present_mode, context->swapchain_extent, context->surface, context->swapchain_details.capabilities, context->graphics_queue.family, context->present_queue.family, context->swapchain);
  if(swapchain == VK_NULL_HANDLE) {
    context->swapchain = VK_NULL_HANDLE;
    return VK_ERROR_INITIALIZATION_FAILED;
  } else {
    context->swapchain = swapchain;
  }

  SwapchainImages swapchain_images = get_swapchain_images(context->device, context->swapchain);
  if(swapchain_images.count == 0) {
    return VK_ERROR_INITIALIZATION_FAILED;
  } else {
    context->swapchain_images = swapchain_images.images;
    context->swapchain_image_count = swapchain_images.count;
  }

  VkImageView* image_views = create_image_views(context->device, context->swapchain_image_count, context->swapchain_images, context->swapchain_format);
  if(image_views == 0) {
    return VK_ERROR_INITIALIZATION_FAILED;
  } else {
    context->swapchain_image_views = image_views;
  }

  VkFramebuffer* framebuffers = create_swapchain_framebuffers(context->device, context->swapchain_image_count, context->swapchain_image_views, context->depth_image_view, context->render_pass, context->swapchain_extent);
  if(framebuffers == 0) {
    return VK_ERROR_INITIALIZATION_FAILED;
  } else {
    context->swapchain_framebuffers = framebuffers;
  }

  VkSemaphore* ia_semaphores = create_semaphores(context->device, 0, context->max_frames_in_flight);
  if(ia_semaphores == 0) {
    fprintf(stderr, "failed to create vulkan image available semaphores\n");
    return 0;
  } else {
    context->image_available_semaphores = ia_semaphores;
  }

  return VK_SUCCESS;
}

void command_draw_object(Object object, VkCommandBuffer command_buffer) {
  MaybeValue maybe_mesh = map_lookup(object.attributes, ATTRIBUTE_ID_MESH);
  if(maybe_mesh.has_value == false) {
    return;
  }

  Mesh* mesh = maybe_mesh.value;

  VkBuffer vertex_buffers[] = {mesh->vertex_buffer.handle};
  VkDeviceSize offsets[] = {0};

  vkCmdBindVertexBuffers(command_buffer, 0, 1, vertex_buffers, offsets);
  vkCmdBindIndexBuffer(command_buffer, mesh->index_buffer.handle, 0, VK_INDEX_TYPE_UINT16);

  vkCmdDrawIndexed(command_buffer, mesh->index_count, 1, 0, 0, 0);
}

void command_draw_pipeline(GraphicsPipeline pipeline, uint32_t object_count, Object* objects, uint32_t frame_num, VkCommandBuffer command_buffer, int offscreen) {
  if(offscreen) {
    vkCmdBindPipeline(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline.offscreen_pipeline);
  } else {
    vkCmdBindPipeline(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline.pipeline);
  }

  if(pipeline.descriptors != NULL) {
    vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline.layout, 1, 1, &pipeline.descriptors[frame_num], 0, 0);
  }

  for(uint32_t i = 0; i < object_count; i++) {
    command_draw_object(objects[i], command_buffer);
  }
}

// Setup a scene for vkCmdDrawIndexedIndirect
// Before the call is made the following needs to be ready:
// 1) Vertex data for entire scene in one vertex buffer
// 2) Index data for entire scene in one index buffer
// 3) Descriptor data in single descriptor set
//   a) e.x. all textures for the draw call need to be in the bound pipeline descriptor set
// 4) Object Data populated per-instance into buffer which will be pushed by VkDeviceAddress
// 5) Buffer of draw command ordered by instance id(first is 0, increase by 1 every 'stride')
//
// Once that is setup, the call to vkCmdDrawIndexed will happen and then:
// 1) For each draw command read from the command buffer
//   a) Consume the indices/vertices to run the vertex shaders
//     i) Vertex shaders access the per-instance object data indexed by gl_instanceID
//     ii) This object data can have indices for other descriptors
//       x) e.x. a shader can read object data with int Z that tell it to use a sampler at binding Z
//
// If I want to start by not worrying about dynamic object load/unload then I can create the above buffers
// when loading the scene, and free them all at once
//
// If I want to start worrying about loading/unloading then I need to find a way to efficiently reconstruct
// these buffers on changes
// Ideas:
//  - Mark objects as 'deleted' to cheaply cull during a compute cull/vertex shader
//    - Would require only a 1-bit change per deletion
//    - Would require defragmentation periodically(or whenever trying to add without space)

VkResult create_scene(){
  

  return VK_SUCCESS;
}

VkResult command_draw_scene(uint32_t pipelines_count, GraphicsPipeline* pipelines, uint32_t* object_counts, Object** objects, uint32_t frame_num, VkDescriptorSet* scene_descriptors, struct ScenePC* scene_constants, VkCommandBuffer command_buffer, VkRenderPass render_pass, VkFramebuffer framebuffer, VkExtent2D extent, VkDeviceAddress object_buffer_addr, int offscreen) {
  VkCommandBufferBeginInfo begin_info = {
    .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO,
    .flags = 0,
    .pInheritanceInfo = 0,
  };

  VkResult result = vkBeginCommandBuffer(command_buffer, &begin_info);
  if(result != VK_SUCCESS) {
    return result;
  }

  VkClearValue clear_colors[] = {
    {
      .color = {
        {0.0f, 0.0f, 0.0f, 1.0f}
      }
    },
    {
      .depthStencil = {1.0f, 0.0f},
    },
  };

  VkRenderPassBeginInfo render_pass_info = {
    .sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO,
    .renderPass = render_pass,
    .framebuffer = framebuffer,
    .renderArea = {
      .offset = {
        .x = 0,
        .y = 0,
      },
      .extent = extent,
    },
    .clearValueCount = sizeof(clear_colors)/sizeof(VkClearValue),
    .pClearValues = clear_colors,
  };

  vkCmdBeginRenderPass(command_buffer, &render_pass_info, VK_SUBPASS_CONTENTS_INLINE);

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

  VkRect2D scissor = {
    .offset = {
      .x = 0.0f,
      .y = 0.0f,
    },
    .extent = extent,
  };
  vkCmdSetScissor(command_buffer, 0, 1, &scissor);

  vkCmdPushConstants(command_buffer, pipelines[0].layout, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(struct ScenePC), scene_constants);
  vkCmdPushConstants(command_buffer, pipelines[0].layout, VK_SHADER_STAGE_VERTEX_BIT, sizeof(struct ScenePC), sizeof(VkDeviceAddress), &object_buffer_addr);

  // Bind the scene descriptor
  vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines[0].layout, 0, 1, &scene_descriptors[frame_num], 0, 0);

  for(uint i = 0; i < pipelines_count; i++) {
    command_draw_pipeline(pipelines[i], object_counts[i], objects[i], frame_num, command_buffer, offscreen);
  }

  vkCmdEndRenderPass(command_buffer);

  return vkEndCommandBuffer(command_buffer);
}

VkCommandBuffer* create_command_buffers(VkDevice device, VkCommandPool command_pool, uint32_t image_count)  {
  VkCommandBufferAllocateInfo alloc_info = {
    .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,
    .commandPool = command_pool,
    .level = VK_COMMAND_BUFFER_LEVEL_PRIMARY,
    .commandBufferCount = image_count,
  };

  VkCommandBuffer* command_buffers = malloc(sizeof(VkCommandBuffer)*image_count);
  if(command_buffers == 0) {
    return 0;
  }

  VkResult result = vkAllocateCommandBuffers(device, &alloc_info, command_buffers);
  if(result != VK_SUCCESS) {
    return VK_NULL_HANDLE;
  }

  return command_buffers;
}

VkFence* create_fences(VkDevice device, VkFenceCreateFlags flags, uint32_t count) {
  VkFence* fences = malloc(sizeof(VkFence)*count);
  if(fences == 0) {
    return 0;
  }

  VkFenceCreateInfo fence_info = {
    .sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO,
    .flags = flags,
  };

  for(uint32_t i = 0; i < count; i++) {
    VkResult result = vkCreateFence(device, &fence_info, 0, &fences[i]);
    if(result != VK_SUCCESS) {
      free(fences);
      return 0;
    }
  }
  return fences;
}

Object create_object() {
  Object ret = {
    .attributes = {
      .buckets = 0,
    },
  };

  Map attributes = map_create(8, 2);
  if(attributes.buckets == 0) {
    return ret;
  }

  ret.attributes = attributes;

  return ret;
}

Object create_renderable(Mesh* mesh, GraphicsPipeline* pipeline) {
  Object zero = {
    .attributes = {
      .buckets = 0,
    },
  };

  Object object = create_object();
  if(object.attributes.buckets == 0) {
    return zero;
  }

  if(mesh == 0 || pipeline == 0) {
    return zero;
  }

  bool result = map_add(&object.attributes, ATTRIBUTE_ID_MESH, mesh);
  if(result == false) {
    map_destroy(object.attributes);
    return zero;
  }

  result = map_add(&object.attributes, ATTRIBUTE_ID_PIPELINE, pipeline);
  if(result == false) {
    map_destroy(object.attributes);
    return zero;
  }

  return object;
}

typedef struct TextureSetStruct {
  uint32_t   max_images;
  Texture*   textures;

  VkDescriptorSet descriptor;
  VkDescriptorPool pool;
} TextureSet;

// TODO
/*VkResult texture_set_add(VkDevice device, GPUPage* page, GPUBuffer staging, VkCommandPool transfer_pool, VkQueue transfer_queue, VkCommandPool graphics_pool, VkQueue graphics_queue, VkExtent2D size, VkFormat format, void* image_data, uint32_t transfer_family, uint32_t graphics_family) {
  return VK_SUCCESS;
}*/

VkResult create_texture_set(VkDevice device, VkDescriptorSetLayout layout, uint32_t max_images, TextureSet* out) {
  if(out == NULL) {
    return VK_ERROR_VALIDATION_FAILED_EXT;
  }

  out->max_images = max_images;

  out->textures = malloc(sizeof(Texture*)*max_images);
  if(out->textures == NULL) {
    return VK_ERROR_OUT_OF_HOST_MEMORY;
  }

  VkDescriptorPoolSize sizes[] = {
    {
      .type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
      .descriptorCount = max_images,
    },
  };

  VkDescriptorPoolCreateInfo pool_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO,
    .flags = VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT,
    .maxSets = 1,
    .pPoolSizes = sizes,
    .poolSizeCount = sizeof(sizes) / sizeof(VkDescriptorPoolSize),
    .pNext = NULL,
  };

  VkResult result = vkCreateDescriptorPool(device, &pool_info, 0, &out->pool);
  if(result != VK_SUCCESS) {
    free(out->textures);
    return result;
  };

  VkDescriptorSetLayout layouts[] = {
    layout,
  };

  VkDescriptorSetAllocateInfo set_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
    .pSetLayouts = layouts,
    .descriptorSetCount = 1,
    .descriptorPool = out->pool,
    .pNext = NULL,
  };

  result = vkAllocateDescriptorSets(device, &set_info, &out->descriptor);
  if(result != VK_SUCCESS) {
    free(out->textures);
    vkDestroyDescriptorPool(device, out->pool, 0);
    return result;
  }

  return VK_SUCCESS;
}

VkResult create_graphics_pipeline(
    VkDevice device,
    VkExtent2D extent,
    VkRenderPass draw_render_pass,
    VkRenderPass offscreen_render_pass,
    GraphicsPipelineInfo pipeline_info,
    uint32_t max_frames_in_flight,
    GraphicsPipeline* out
    ) {

  if(out == NULL) {
    return VK_ERROR_VALIDATION_FAILED_EXT;
  }

  out->max_frames_in_flight = max_frames_in_flight;

  if(pipeline_info.set_layout != VK_NULL_HANDLE) {
    out->descriptors = malloc(sizeof(VkDescriptorSet)*max_frames_in_flight);
    if(out->descriptors == 0) {
      return VK_ERROR_OUT_OF_HOST_MEMORY;
    }
    for(uint32_t i = 0; i < max_frames_in_flight; i++) {
      out->descriptors[i] = VK_NULL_HANDLE;
    }
  }

  VkDescriptorSetLayout all_layouts[2] = {pipeline_info.scene_layout, pipeline_info.set_layout};
  uint32_t num_sets = 1;
  if(pipeline_info.set_layout != VK_NULL_HANDLE) {
    num_sets += 1;
  }

  VkPushConstantRange pcr = {
    .stageFlags = VK_SHADER_STAGE_VERTEX_BIT,
    .offset = 0,
    .size = sizeof(struct ScenePC) + sizeof(VkDeviceAddress),
  };

  VkPipelineLayoutCreateInfo layout_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
    .setLayoutCount = num_sets,
    .pSetLayouts = all_layouts,
    .pushConstantRangeCount = 1,
    .pPushConstantRanges = &pcr,
  };

  VkResult result = vkCreatePipelineLayout(device, &layout_info, 0, &out->layout);
  if(result != VK_SUCCESS) {
    return result;
  }

  VkDynamicState dynamic_states[] = {
    VK_DYNAMIC_STATE_VIEWPORT,
    VK_DYNAMIC_STATE_SCISSOR,
  };

  uint32_t dynamic_state_count = sizeof(dynamic_states)/sizeof(VkDynamicState);

  VkPipelineDynamicStateCreateInfo dynamic_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO,
    .dynamicStateCount = dynamic_state_count,
    .pDynamicStates = dynamic_states,
  };

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

  VkViewport viewport = {
    .x = 0.0f,
    .y = 0.0f,
    .width = (float)(extent.width),
    .height = (float)(extent.height),
    .minDepth = 0.0f,
    .maxDepth = 1.0f,
  };

  VkRect2D scissor = {
    .offset = {
      .x = 0,
      .y = 0,
    },
    .extent = extent,
  };

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

  VkPipelineRasterizationStateCreateInfo raster_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
    .depthClampEnable = VK_FALSE,
    .rasterizerDiscardEnable = VK_FALSE,
    .polygonMode = VK_POLYGON_MODE_FILL,
    .lineWidth = 1.0f,
    .cullMode = VK_CULL_MODE_BACK_BIT,
    .frontFace = VK_FRONT_FACE_CLOCKWISE,
    .depthBiasEnable = VK_FALSE,
    .depthBiasConstantFactor = 0.0f,
    .depthBiasClamp = 0.0f,
    .depthBiasSlopeFactor = 0.0f,
  };

  VkPipelineMultisampleStateCreateInfo multisample_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,
    .sampleShadingEnable = VK_FALSE,
    .rasterizationSamples = VK_SAMPLE_COUNT_1_BIT,
    .minSampleShading = 1.0f,
    .pSampleMask = 0,
    .alphaToCoverageEnable = VK_FALSE,
    .alphaToOneEnable = VK_FALSE,
  };

  VkPipelineDepthStencilStateCreateInfo depth_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO,
    .depthTestEnable = VK_TRUE,
    .depthWriteEnable = VK_TRUE,
    .depthCompareOp = VK_COMPARE_OP_LESS,
    .depthBoundsTestEnable = VK_FALSE,
    .maxDepthBounds = 1.0f,
    .minDepthBounds = 0.0f,
    .stencilTestEnable = VK_FALSE,
    .front = {},
    .back = {},
  };

  VkPipelineColorBlendAttachmentState color_blend_attachment = {
    .colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT,
    .blendEnable = VK_TRUE,
    .srcColorBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA,
    .dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA,
    .colorBlendOp = VK_BLEND_OP_ADD,
    .srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE,
    .dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO,
    .alphaBlendOp = VK_BLEND_OP_ADD,
  };

  VkPipelineColorBlendStateCreateInfo color_blend_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
    .logicOpEnable = VK_FALSE,
    .logicOp = VK_LOGIC_OP_COPY,
    .attachmentCount = 1,
    .pAttachments = &color_blend_attachment,
    .blendConstants[0] = 0.0f,
    .blendConstants[1] = 0.0f,
    .blendConstants[2] = 0.0f,
    .blendConstants[3] = 0.0f,
  };

  VkGraphicsPipelineCreateInfo draw_pipeline_info = {
    .sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
    .stageCount = pipeline_info.shader_stages_count,
    .pStages = pipeline_info.shader_stages,
    .pVertexInputState = &pipeline_info.input_info,
    .pInputAssemblyState = &input_assembly_info,
    .pViewportState = &viewport_state,
    .pRasterizationState = &raster_info,
    .pColorBlendState = &color_blend_info,
    .pDynamicState = &dynamic_info,
    .pDepthStencilState = &depth_info,
    .pMultisampleState = &multisample_info,
    .layout = out->layout,
    .renderPass = draw_render_pass,
    .subpass = 0,
    .basePipelineHandle = VK_NULL_HANDLE,
    .basePipelineIndex = -1,
  };

  VkPipelineColorBlendAttachmentState offscreen_attachment_states[] = {
    {
      .colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT,
      .blendEnable = VK_FALSE,
    },
  };

  VkPipelineColorBlendStateCreateInfo offscreen_blend_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
    .logicOpEnable = VK_FALSE,
    .logicOp = VK_LOGIC_OP_COPY,
    .attachmentCount = sizeof(offscreen_attachment_states)/sizeof(VkPipelineColorBlendAttachmentState),
    .pAttachments = offscreen_attachment_states,
    .blendConstants[0] = 0.0f,
    .blendConstants[1] = 0.0f,
    .blendConstants[2] = 0.0f,
    .blendConstants[3] = 0.0f,
  };

  VkGraphicsPipelineCreateInfo offscreen_pipeline_info = {
    .sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
    .stageCount = pipeline_info.shader_stages_count,
    .pStages = pipeline_info.shader_stages, // TODO: offscreen stages
    .pVertexInputState = &pipeline_info.input_info,
    .pInputAssemblyState = &input_assembly_info,
    .pViewportState = &viewport_state,
    .pRasterizationState = &raster_info,
    .pColorBlendState = &offscreen_blend_info,
    .pDynamicState = &dynamic_info,
    .pDepthStencilState = &depth_info,
    .pMultisampleState = &multisample_info,
    .layout = out->layout,
    .renderPass = offscreen_render_pass,
    .subpass = 0,
    .basePipelineHandle = VK_NULL_HANDLE,
    .basePipelineIndex = -1,
  };

  result = vkCreateGraphicsPipelines(device, VK_NULL_HANDLE, 1, &draw_pipeline_info, 0, &out->pipeline);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = vkCreateGraphicsPipelines(device, VK_NULL_HANDLE, 1, &offscreen_pipeline_info, 0, &out->offscreen_pipeline);
  if(result != VK_SUCCESS) {
    return result;
  }

  return VK_SUCCESS;
}

VkResult create_simple_mesh_pipeline(VkDevice device, VkExtent2D extent, VkRenderPass render_pass, VkRenderPass offscreen_render_pass, VkDescriptorSetLayout scene_layout, uint32_t max_frames_in_flight, GraphicsPipeline* out) {
  if(out == NULL) {
    return VK_ERROR_VALIDATION_FAILED_EXT;
  }

  VkShaderModule vert_shader = load_shader_file("shader_src/basic.vert.spv", device);
  VkShaderModule frag_shader = load_shader_file("shader_src/basic.frag.spv", device);
  VkPipelineShaderStageCreateInfo shader_stages[2] = {
    {
      .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
      .stage = VK_SHADER_STAGE_VERTEX_BIT,
      .module = vert_shader,
      .pName = "main",
    },
    {
      .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
      .stage = VK_SHADER_STAGE_FRAGMENT_BIT,
      .module = frag_shader,
      .pName = "main",
    },
  };

  VkVertexInputBindingDescription bindings[1] = {
    {
      .binding = 0, // Which buffer 'binding' to use
      .stride = sizeof(struct Vertex), // How many bytes to increase the index between instance
      .inputRate = VK_VERTEX_INPUT_RATE_VERTEX, // Whether an instance is a vertex or an index
    },
  };

  VkVertexInputAttributeDescription attributes[2] = {
    {
      .binding = 0, // Which buffer 'binding' to use
      .location = 0, // Which 'location' to export as to shader
      .format = VK_FORMAT_R32G32B32_SFLOAT, // What format to interpret as for shader
      .offset = offsetof(struct Vertex, pos), // What offset from instance start
    },
    {
      .binding = 0,
      .location = 1,
      .format = VK_FORMAT_R32G32B32_SFLOAT,
      .offset = offsetof(struct Vertex, color),
    },
  };

  VkPipelineVertexInputStateCreateInfo input_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
    .pVertexBindingDescriptions = bindings,
    .vertexBindingDescriptionCount = sizeof(bindings)/sizeof(VkVertexInputBindingDescription),
    .pVertexAttributeDescriptions = attributes,
    .vertexAttributeDescriptionCount = sizeof(attributes)/sizeof(VkVertexInputAttributeDescription),
  };

  GraphicsPipelineInfo pipeline_info = {
    .set_layout = VK_NULL_HANDLE,
    .shader_stages_count = sizeof(shader_stages)/sizeof(VkPipelineShaderStageCreateInfo),
    .shader_stages = shader_stages,
    .scene_layout = scene_layout,
    .input_info = input_info,
  };

  return create_graphics_pipeline(device, extent, render_pass, offscreen_render_pass, pipeline_info, max_frames_in_flight, out);
}

VkResult create_texture_mesh_pipeline(VkDevice device, VkPhysicalDeviceMemoryProperties memories, VkExtent2D extent, VkRenderPass render_pass, VkRenderPass offscreen_render_pass, VkDescriptorSetLayout scene_layout, uint32_t max_frames_in_flight, VkCommandPool transfer_pool, Queue transfer_queue, Queue graphics_queue, VkCommandPool graphics_pool, GraphicsPipeline* out) {
  if(out == NULL) {
    return VK_ERROR_VALIDATION_FAILED_EXT;
  }

  VkShaderModule vert_shader = load_shader_file("shader_src/texture.vert.spv", device);
  VkShaderModule frag_shader = load_shader_file("shader_src/texture.frag.spv", device);
  VkPipelineShaderStageCreateInfo shader_stages[2] = {
    {
      .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
      .stage = VK_SHADER_STAGE_VERTEX_BIT,
      .module = vert_shader,
      .pName = "main",
    },
    {
      .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
      .stage = VK_SHADER_STAGE_FRAGMENT_BIT,
      .module = frag_shader,
      .pName = "main",
    },
  };


  VkVertexInputBindingDescription bindings[] = {
    {
      .binding = 0,
      .stride = sizeof(struct TextureVertex),
      .inputRate = VK_VERTEX_INPUT_RATE_VERTEX,
    },
  };

  VkVertexInputAttributeDescription attributes[] = {
    {
      .binding = 0,
      .location = 0,
      .format = VK_FORMAT_R32G32B32_SFLOAT,
      .offset = offsetof(struct TextureVertex, pos),
    },
    {
      .binding = 0,
      .location = 1,
      .format = VK_FORMAT_R32G32B32_SFLOAT,
      .offset = offsetof(struct TextureVertex, color),
    },
    {
      .binding = 0,
      .location = 2,
      .format = VK_FORMAT_R32G32_SFLOAT,
      .offset = offsetof(struct TextureVertex, tex),
    },
  };

  // TODO: use bindless descriptors for textures, so each draw command will bind a large buffer that is indexed by object ID to get the address of the texture in GPU memory
  VkDescriptorSetLayoutBinding set_bindings[] = {
    {
      .binding = 0,
      .descriptorCount = 1000,
      .descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
      .pImmutableSamplers = 0,
      .stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT,
    },
  };

  VkDescriptorBindingFlags set_binding_flags[] = {
    VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT | VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT,
  };

  VkDescriptorSetLayoutBindingFlagsCreateInfo set_flags_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_BINDING_FLAGS_CREATE_INFO,
    .bindingCount = sizeof(set_bindings)/sizeof(VkDescriptorSetLayoutBinding),
    .pBindingFlags = set_binding_flags,
  };

  VkDescriptorSetLayoutCreateInfo set_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
    .pBindings = set_bindings,
    .bindingCount = sizeof(set_bindings)/sizeof(VkDescriptorSetLayoutBinding),
    .flags = VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT,
    .pNext = &set_flags_info,
  };

  VkDescriptorSetLayout set_layout = VK_NULL_HANDLE;
  VkResult result = vkCreateDescriptorSetLayout(device, &set_info, 0, &set_layout);
  if(result != VK_SUCCESS) {
    return result;
  }

  TextureSet texture_set = {0};
  result = create_texture_set(device, set_layout, 1000, &texture_set);
  if(result != VK_SUCCESS) {
    return result;
  }

  VkPipelineVertexInputStateCreateInfo input_info = {
    .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
    .pVertexBindingDescriptions = bindings,
    .vertexBindingDescriptionCount = sizeof(bindings)/sizeof(VkVertexInputBindingDescription),
    .pVertexAttributeDescriptions = attributes,
    .vertexAttributeDescriptionCount = sizeof(attributes)/sizeof(VkVertexInputAttributeDescription),
  };

  GraphicsPipelineInfo pipeline_info = {
    .set_layout = set_layout,
    .shader_stages_count = sizeof(shader_stages)/sizeof(VkPipelineShaderStageCreateInfo),
    .shader_stages = shader_stages,
    .scene_layout = scene_layout,
    .input_info = input_info,
  };

  GPUPage* memory = NULL;
  result = gpu_page_allocate(device, memories, 100000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, 0, &memory);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = create_graphics_pipeline(device, extent, render_pass, offscreen_render_pass, pipeline_info, max_frames_in_flight, out);
  if(result != VK_SUCCESS) {
    return result;
  }

  VkExtent2D texture_size = {
    .width = 10,
    .height = 10,
  };
  (void)texture_size;

  struct __attribute__((__packed__)) texel  {
    uint8_t r;
    uint8_t g;
    uint8_t b;
    uint8_t a;
  };

  struct texel WHT = {255, 255, 255, 255};
  struct texel BLK = {0, 0, 0, 255};
  struct texel RED = {255, 0, 0, 255};
  struct texel GRN = {0, 255, 0, 255};
  struct texel BLU = {0, 0, 255, 255};

  struct texel texture_data_0[100] = {
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, BLK,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, BLK,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, WHT,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, WHT,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, BLK,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, BLK,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, WHT,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, WHT,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, BLK,
    RED, WHT, GRN, WHT, BLU, WHT, RED, WHT, GRN, BLK,
  };

  struct texel texture_data_1[100] = {
    RED, RED, RED, RED, RED, RED, RED, RED, RED, RED,
    RED, WHT, WHT, WHT, WHT, WHT, WHT, WHT, WHT, RED,
    RED, WHT, GRN, GRN, GRN, GRN, GRN, GRN, WHT, RED,
    RED, WHT, GRN, BLU, BLU, BLU, BLU, GRN, WHT, RED,
    RED, WHT, GRN, BLU, BLK, BLK, BLU, GRN, WHT, RED,
    RED, WHT, GRN, BLU, BLK, BLK, BLU, GRN, WHT, RED,
    RED, WHT, GRN, BLU, BLU, BLU, BLU, GRN, WHT, RED,
    RED, WHT, GRN, GRN, GRN, GRN, GRN, GRN, WHT, RED,
    RED, WHT, WHT, WHT, WHT, WHT, WHT, WHT, WHT, RED,
    RED, RED, RED, RED, RED, RED, RED, RED, RED, RED,
  };

  GPUPage* texture_memory = NULL;
  result = gpu_page_allocate(device, memories, 100000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT, 0, &texture_memory);
  if(result != VK_SUCCESS) {
    return result;
  }

  GPUPage* staging_memory = NULL;
  result = gpu_page_allocate(device, memories, 100000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, 0, &staging_memory);
  if(result != VK_SUCCESS) {
    return result;
  }

  GPUBuffer staging = {0};
  result = gpu_buffer_malloc(device, staging_memory, 100000, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, &staging);
  if(result != VK_SUCCESS) {
    return result;
  }

  Texture test_texture_0 = load_texture(device, texture_memory, staging, transfer_pool, transfer_queue, graphics_pool, graphics_queue, texture_size, VK_FORMAT_R8G8B8A8_SRGB, texture_data_0);

  Texture test_texture_1 = load_texture(device, texture_memory, staging, transfer_pool, transfer_queue, graphics_pool, graphics_queue, texture_size, VK_FORMAT_R8G8B8A8_SRGB, texture_data_1);

  VkDescriptorImageInfo image_info_0 = {
    .sampler = test_texture_0.sampler,
    .imageView = test_texture_0.view,
    .imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
  };

  VkDescriptorImageInfo image_info_1 = {
    .sampler = test_texture_1.sampler,
    .imageView = test_texture_1.view,
    .imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
  };

  VkWriteDescriptorSet descriptor_write = {
    .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
    .dstSet = texture_set.descriptor,
    .dstBinding = 0,
    .descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
    .descriptorCount = 1,
    .pBufferInfo = 0,
    .pTexelBufferView = 0,
  };

  descriptor_write.pImageInfo = &image_info_0;
  descriptor_write.dstArrayElement = 0;
  vkUpdateDescriptorSets(device, 1, &descriptor_write, 0, 0);
  
  descriptor_write.pImageInfo = &image_info_1;
  descriptor_write.dstArrayElement = 1;
  vkUpdateDescriptorSets(device, 1, &descriptor_write, 0, 0);

  for(uint32_t i = 0; i < out->max_frames_in_flight; i++) {
    out->descriptors[i] = texture_set.descriptor;
    fprintf(stderr, "descriptor[%d]: %p\n", i, out->descriptors[i]);
  }

  return VK_SUCCESS;
}

VkResult command_copy_to_buffer(VkDevice device, GPUBuffer staging, VkBuffer destination, void* data, VkDeviceSize size, VkDeviceSize offset, VkCommandPool pool, Queue queue) {
  memcpy(staging.page->ptr + staging.memory->offset, data, size);

  VkCommandBuffer command_buffer = command_begin_single(device, pool);
  if(command_buffer == VK_NULL_HANDLE) {
    return VK_ERROR_UNKNOWN;
  }

  VkBufferCopy region = {
    .srcOffset = 0,
    .dstOffset = offset,
    .size = size,
  };

  vkCmdCopyBuffer(command_buffer, staging.handle, destination, 1, &region);

  return command_end_single(device, command_buffer, pool, queue);
}

Mesh* load_mesh_to_buffer(VkDevice device, GPUPage* page, GPUBuffer staging, uint32_t vertex_count, uint32_t vertex_stride, void* vertex_data, uint32_t index_count, uint32_t index_stride, void* index_data, VkCommandPool pool, Queue queue) {
  GPUBuffer vertex_buffer = {0};
  GPUBuffer index_buffer = {0};

  VkResult result = gpu_buffer_malloc(device, page, vertex_count*vertex_stride, VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT, &vertex_buffer);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "Failed to create vertex buffer\n");
    return NULL;
  }

  result = gpu_buffer_malloc(device, page, sizeof(uint16_t)*index_count, VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT, &index_buffer);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "Failed to create index buffer\n");
    return NULL;
  }

  result = command_copy_to_buffer(device, staging, vertex_buffer.handle, vertex_data, vertex_count*vertex_stride, 0, pool, queue);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "Failed to copy to vertex buffer\n");
    return NULL;
  }

  result = command_copy_to_buffer(device, staging, index_buffer.handle, index_data, index_stride*index_count, 0, pool, queue);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "Failed to copy to index buffer\n");
    return NULL;
  }

  Mesh* mesh = malloc(sizeof(Mesh));
  if(mesh == NULL) {
    return NULL;
  }

  mesh->vertex_buffer = vertex_buffer;
  mesh->vertex_count = vertex_count;
  mesh->index_buffer = index_buffer;
  mesh->index_count = index_count;

  return mesh;
}

VulkanContext* init_vulkan(GLFWwindow* window, uint32_t max_frames_in_flight) {
  VulkanContext* context = (VulkanContext*)malloc(sizeof(VulkanContext));

  VkResult result = create_instance(&context->instance);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to initialize vulkan instance\n");
    return 0;
  }

  result = create_debug_messenger(context->instance, &context->debug_messenger);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to initialize vulkan debug messenger\n");
    return 0;
  }

  result = get_best_physical_device(context->instance, &context->physical_device);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to pick vulkan physical device\n");
    return 0;
  }

  vkGetPhysicalDeviceMemoryProperties(context->physical_device, &context->memories);

  result = glfwCreateWindowSurface(context->instance, window, 0, &context->surface);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create vulkan surface\n");
    return 0;
  }

  result = create_logical_device(context->physical_device, context->surface, &context->graphics_queue, &context->present_queue, &context->transfer_queue, &context->device);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create vulkan logical device\n");
    return 0;
  }

  result = get_swapchain_details(context->physical_device, context->surface, &context->swapchain_details);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create vulkan logical device\n");
    return 0;
  }

  context->swapchain_format = choose_swapchain_format(context->swapchain_details);
  context->swapchain_present_mode = choose_present_mode(context->swapchain_details);
  context->swapchain_extent = choose_swapchain_extent(context->swapchain_details);

  VkSwapchainKHR swapchain = create_swapchain(context->device, context->swapchain_format, context->swapchain_present_mode, context->swapchain_extent, context->surface, context->swapchain_details.capabilities, context->graphics_queue.family, context->present_queue.family, VK_NULL_HANDLE);
  if(swapchain == VK_NULL_HANDLE) {
    fprintf(stderr, "failed to create vulkan swapchain\n");
    return 0;
  } else {
    context->swapchain = swapchain;
  }

  SwapchainImages swapchain_images = get_swapchain_images(context->device, context->swapchain);
  if(swapchain_images.count == 0) {
    fprintf(stderr, "failed to get vulkan swapchain images\n");
    return 0;
  } else {
    context->swapchain_image_count = swapchain_images.count;
    context->swapchain_images = swapchain_images.images;
  }

  VkImageView* image_views = create_image_views(context->device, context->swapchain_image_count, context->swapchain_images, context->swapchain_format);
  if(image_views == 0) {
    fprintf(stderr, "failed to create vulkan image views\n");
    return 0;
  } else {
    context->swapchain_image_views = image_views;
  }

  VkFormat requested[] = {
    VK_FORMAT_D32_SFLOAT,
    VK_FORMAT_D32_SFLOAT_S8_UINT,
    VK_FORMAT_D24_UNORM_S8_UINT
  };
  VkFormat depth_format = find_depth_format(context->physical_device, 3, requested, VK_IMAGE_TILING_OPTIMAL, VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT);
  if(depth_format == VK_FORMAT_MAX_ENUM) {
    fprintf(stderr, "failed to find a suitable depth image format\n");
    return 0;
  } else {
    context->depth_format = depth_format;
  }

  VkCommandPoolCreateInfo extra_pool_info = {
    .sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,
    .queueFamilyIndex = context->graphics_queue.family,
    .flags = VK_COMMAND_POOL_CREATE_TRANSIENT_BIT,
  };

  result = vkCreateCommandPool(context->device, &extra_pool_info, 0, &context->extra_graphics_pool);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create extra graphics command pool\n");
    return 0;
  }

  if(create_depth_image(context) != 0) {
    fprintf(stderr, "failed to create depth image\n");
    return 0;
  }

  VkRenderPass render_pass = create_render_pass(context->device, context->swapchain_format, context->depth_format);
  if(render_pass == VK_NULL_HANDLE) {
    fprintf(stderr, "failed to create vulkan render pass\n");
    return 0;
  } else {
    context->render_pass = render_pass;
  }

  VkFramebuffer* framebuffers = create_swapchain_framebuffers(context->device, context->swapchain_image_count, context->swapchain_image_views, context->depth_image_view, context->render_pass, context->swapchain_extent);
  if(framebuffers == 0) {
    fprintf(stderr, "failed to create vulkan framebuffers\n");
    return 0;
  } else {
    context->swapchain_framebuffers = framebuffers;
  }

  VkCommandPoolCreateInfo graphics_pool_info = {
    .sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,
    .flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT,
    .queueFamilyIndex = context->graphics_queue.family,
  };
  VkCommandPool graphics_command_pool;
  result = vkCreateCommandPool(context->device, &graphics_pool_info, 0, &graphics_command_pool);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create vulkan graphics command pool");
    return 0;
  } else {
    context->graphics_command_pool = graphics_command_pool;
  }

  VkCommandPoolCreateInfo transfer_pool_info = {
    .sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,
    .flags = VK_COMMAND_POOL_CREATE_TRANSIENT_BIT,
    .queueFamilyIndex = context->transfer_queue.family,
  };
  VkCommandPool transfer_command_pool;
  result = vkCreateCommandPool(context->device, &transfer_pool_info, 0, &transfer_command_pool);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create vulkan transfer command pool");
    return 0;
  } else {
    context->transfer_command_pool = transfer_command_pool;
  }

  context->max_frames_in_flight = max_frames_in_flight;

  VkCommandBuffer* swapchain_command_buffers = create_command_buffers(context->device, context->graphics_command_pool, max_frames_in_flight);
  if(swapchain_command_buffers == VK_NULL_HANDLE) {
    fprintf(stderr, "failed to create vulkan swapchain command buffer\n");
    return 0;
  } else {
    context->swapchain_command_buffers = swapchain_command_buffers;
  }

  context->offscreen_command_buffers = create_command_buffers(context->device, context->graphics_command_pool, context->max_frames_in_flight);
  if(swapchain_command_buffers == VK_NULL_HANDLE) {
    fprintf(stderr, "failed to create vulkan swapchain command buffer\n");
    return 0;
  }

  VkSemaphore* ia_semaphores = create_semaphores(context->device, 0, max_frames_in_flight);
  if(ia_semaphores == 0) {
    fprintf(stderr, "failed to create vulkan image available semaphores\n");
    return 0;
  } else {
    context->image_available_semaphores = ia_semaphores;
  }

  VkSemaphore* rf_semaphores = create_semaphores(context->device, 0, max_frames_in_flight);
  if(rf_semaphores == 0) {
    fprintf(stderr, "failed to create vulkan render finished semaphores\n");
    return 0;
  } else {
    context->render_finished_semaphores = rf_semaphores;
  }

  context->offscreen_complete_semaphores = create_semaphores(context->device, 0, 1);
  if(context->offscreen_complete_semaphores == NULL) {
    return 0;
  }

  VkFence* if_fences = create_fences(context->device, VK_FENCE_CREATE_SIGNALED_BIT, max_frames_in_flight);
  if(if_fences == 0) {
    fprintf(stderr, "failed to create vulkan in flight fence\n");
    return 0;
  } else {
    context->in_flight_fences = if_fences;
  }

  result = gpu_page_allocate(context->device, context->memories, 15360000*3, 0xFFFFFFFF, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT, 0, &context->g_buffer_page);
  if(result != VK_SUCCESS) {
    return 0;
  }

  VkImageCreateInfo g_pos_info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
    .usage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT,
    .imageType = VK_IMAGE_TYPE_2D,
    .extent = {
      .width = context->swapchain_extent.width,
      .height = context->swapchain_extent.height,
      .depth = 1,
    },
    .mipLevels = 1,
    .arrayLayers = 1,
    .samples = VK_SAMPLE_COUNT_1_BIT,
    .tiling = VK_IMAGE_TILING_OPTIMAL,
    .format = VK_FORMAT_R16G16B16A16_SFLOAT,
  };

  result = gpu_image_malloc(context->device, context->g_buffer_page, &g_pos_info, &context->g_image_position);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to allocate image\n");
    return 0;
  }

  VkImageViewCreateInfo g_pos_view_info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
    .image = context->g_image_position.handle,
    .viewType = VK_IMAGE_VIEW_TYPE_2D,
    .format = VK_FORMAT_R16G16B16A16_SFLOAT,
    .subresourceRange = {
      .aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
      .baseMipLevel = 0,
      .levelCount = 1,
      .baseArrayLayer = 0,
      .layerCount = 1,
    },
  };

  result = vkCreateImageView(context->device, &g_pos_view_info, 0, &context->g_image_view_position);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create image view\n");
    return 0;
  }

  VkExtent3D offscreen_extent = {
    .width = context->swapchain_extent.width,
    .height = context->swapchain_extent.height,
    .depth = 1,
  };

  VkImageCreateInfo offscreen_depth_info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
    .imageType = VK_IMAGE_TYPE_2D,
    .pNext = NULL,
    .extent = offscreen_extent,
    .mipLevels = 1,
    .arrayLayers = 1,
    .format = context->depth_format,
    .tiling = VK_IMAGE_TILING_OPTIMAL,
    .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
    .usage = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT,
    .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
    .samples = VK_SAMPLE_COUNT_1_BIT,
    .flags = 0,
  };

  result = gpu_image_malloc(context->device, context->g_buffer_page, &offscreen_depth_info, &context->g_image_depth);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to allocate g_image_depth\n");
    return 0;
  }

  VkImageViewCreateInfo g_depth_view_info = {
    .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
    .image = context->g_image_depth.handle,
    .viewType = VK_IMAGE_VIEW_TYPE_2D,
    .format = context->depth_format,
    .components = {
      .r = VK_COMPONENT_SWIZZLE_IDENTITY,
      .g = VK_COMPONENT_SWIZZLE_IDENTITY,
      .b = VK_COMPONENT_SWIZZLE_IDENTITY,
      .a = VK_COMPONENT_SWIZZLE_IDENTITY,
    },
    .subresourceRange = {
      .aspectMask = VK_IMAGE_ASPECT_DEPTH_BIT,
      .baseMipLevel = 0,
      .levelCount = 1,
      .baseArrayLayer = 0,
      .layerCount = 1,
    },
  };

  result = vkCreateImageView(context->device, &g_depth_view_info, 0, &context->g_image_view_depth);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "Failed to allocate g_image_view_depth\n");
    return 0;
  }

  result = command_transition_image_layout(context->device, context->extra_graphics_pool, context->graphics_queue, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_OPTIMAL, context->g_image_depth.handle, 0, VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT, VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED, VK_IMAGE_ASPECT_DEPTH_BIT);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "Failed to transition g_image_depth to VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_OPTIMAL\n");
    return 0;
  }

  VkAttachmentDescription offscreen_attachments[] = {
    {
      .format = VK_FORMAT_R16G16B16A16_SFLOAT,
      .samples = VK_SAMPLE_COUNT_1_BIT,
      .loadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE,
      .storeOp = VK_ATTACHMENT_STORE_OP_STORE,
      .stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE,
      .stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE,
      .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
      .finalLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
    },
    {
      .format = context->depth_format,
      .samples = VK_SAMPLE_COUNT_1_BIT,
      .loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR,
      .storeOp = VK_ATTACHMENT_STORE_OP_STORE,
      .stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE,
      .stencilStoreOp = VK_ATTACHMENT_STORE_OP_STORE,
      .initialLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL,
      .finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL,
    },
  };

  VkAttachmentReference offscreen_attachment_refs[] = {
    {
      .attachment = 0,
      .layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
    }
  };

  VkAttachmentReference offscreen_depth_reference = {
    .attachment = 1,
    .layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL,
  };

  VkSubpassDescription offscreen_pass_descs[] = {
    {
      .pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS,
      .colorAttachmentCount = sizeof(offscreen_attachment_refs)/sizeof(VkAttachmentReference),
      .pColorAttachments = offscreen_attachment_refs,
      .pDepthStencilAttachment = &offscreen_depth_reference,
    },
  };

  VkSubpassDependency offscreen_pass_dependencies[] = {
    {
      .srcSubpass = VK_SUBPASS_EXTERNAL,
      .dstSubpass = 0,
      .srcStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,
      .dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT | VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT,
      .srcAccessMask = VK_ACCESS_MEMORY_READ_BIT,
      .dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT,
      .dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT,
    },
    {
      .srcSubpass = 0,
      .dstSubpass = VK_SUBPASS_EXTERNAL,
      .srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT | VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT,
      .dstStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,
      .srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT,
      .dstAccessMask = VK_ACCESS_MEMORY_READ_BIT,
      .dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT,
    },
  };

  VkRenderPassCreateInfo offscreen_pass_info = {
    .sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
    .attachmentCount = sizeof(offscreen_attachments)/sizeof(VkAttachmentDescription),
    .pAttachments = offscreen_attachments,
    .subpassCount = sizeof(offscreen_pass_descs)/sizeof(VkSubpassDescription),
    .pSubpasses = offscreen_pass_descs,
    .dependencyCount = sizeof(offscreen_pass_dependencies)/sizeof(VkSubpassDependency),
    .pDependencies = offscreen_pass_dependencies,
  };

  result = vkCreateRenderPass(context->device, &offscreen_pass_info, 0, &context->g_renderpass);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "Failed to create offscreen renderpass\n");
    return 0;
  }

  VkImageView offscreen_fb_attachments[2] = {
    context->g_image_view_position,
    context->g_image_view_depth,
  };

  VkFramebufferCreateInfo offscreen_framebuffer_info = {
      .sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,
      .renderPass = context->g_renderpass,
      .attachmentCount = sizeof(offscreen_fb_attachments)/sizeof(VkImageView),
      .pAttachments = offscreen_fb_attachments,
      .width = context->swapchain_extent.width,
      .height = context->swapchain_extent.height,
      .layers = 1,
  };

  result = vkCreateFramebuffer(context->device, &offscreen_framebuffer_info, 0, &context->g_framebuffer);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to allocate offscreen framebuffer\n");
    return 0;
  }

  return context;
}

SceneContext create_scene_context(VkDevice device, VkPhysicalDeviceMemoryProperties memories, uint32_t max_frames_in_flight) {
  SceneContext ret = {
    .pool = VK_NULL_HANDLE,
    .descriptor_layout = VK_NULL_HANDLE,
    .descriptors = 0,
    .ubos = 0,
    .ubo_ptrs = 0,
  };

  VkDescriptorPoolSize pool_sizes[] = {
    {
      .type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
      .descriptorCount = max_frames_in_flight,
    }
  };

  VkDescriptorPoolCreateInfo pool_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO,
    .poolSizeCount = 1,
    .pPoolSizes = pool_sizes,
    .maxSets = max_frames_in_flight,
  };

  VkDescriptorPool pool;
  VkResult result = vkCreateDescriptorPool(device, &pool_info, 0, &pool);
  if(result != VK_SUCCESS) {
    return ret;
  }

  VkDescriptorSetLayoutBinding layout_bindings[] = {
    {
      .binding = 0,
      .stageFlags = VK_SHADER_STAGE_VERTEX_BIT,
      .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
      .descriptorCount = 1,
      .pImmutableSamplers = 0,
    }
  };

  VkDescriptorSetLayoutCreateInfo layout_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
    .bindingCount = 1,
    .pBindings = layout_bindings,
  };

  VkDescriptorSetLayout layout;
  result = vkCreateDescriptorSetLayout(device, &layout_info, 0, &layout);
  if(result != VK_SUCCESS) {
    vkDestroyDescriptorPool(device, pool, 0);
    return ret;
  }

  VkDescriptorSetLayout* layouts = malloc(sizeof(VkDescriptorSetLayout)*max_frames_in_flight);
  if(layouts == 0) {
    vkDestroyDescriptorPool(device, pool, 0);
    return ret;
  }

  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
    layouts[i] = layout;
  }

  VkDescriptorSet* sets = malloc(sizeof(VkDescriptorSet)*max_frames_in_flight);
  if(sets == 0) {
    free(layouts);
    vkDestroyDescriptorPool(device, pool, 0);
    return ret;
  }

  VkDescriptorSetAllocateInfo set_alloc_info = {
    .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
    .descriptorPool = pool,
    .descriptorSetCount = max_frames_in_flight,
    .pSetLayouts = layouts,
  };

  result = vkAllocateDescriptorSets(device, &set_alloc_info, sets);
  free(layouts);
  if(result != VK_SUCCESS) {
    free(sets);
    vkDestroyDescriptorPool(device, pool, 0);
    return ret;
  }

  GPUPage* scene_ubo_memory = NULL;
  result = gpu_page_allocate(device, memories, 1000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT,  VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, 0, &scene_ubo_memory);
  if(result != VK_SUCCESS) {
    return ret;
  }

  GPUBuffer* ubos = malloc(sizeof(GPUBuffer)*max_frames_in_flight);
  if(ubos == NULL) {
    return ret;
  }

  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
    result = gpu_buffer_malloc(device, scene_ubo_memory, sizeof(struct SceneUBO), VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, &ubos[i]);
    if(result != VK_SUCCESS) {
      free(sets);
      free(ubos);
      vkFreeDescriptorSets(device, pool, max_frames_in_flight, sets);
      vkDestroyDescriptorPool(device, pool, 0);
      return ret;
    }
  }

  void** ubo_ptrs = malloc(sizeof(void*)*max_frames_in_flight);
  if(ubo_ptrs == 0) {
    free(sets);
    vkFreeDescriptorSets(device, pool, max_frames_in_flight, sets);
    vkDestroyDescriptorPool(device, pool, 0);
    free(ubos);
    return ret;
  }

  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
    ubo_ptrs[i] = ubos[i].page->ptr + ubos[i].memory->offset;

    VkDescriptorBufferInfo buffer_info = {
      .buffer = ubos[i].handle,
      .offset = 0,
      .range = sizeof(struct SceneUBO),
    };
    VkWriteDescriptorSet write = {
      .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
      .dstSet = sets[i],
      .dstBinding = 0,
      .dstArrayElement = 0,
      .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
      .descriptorCount = 1,
      .pBufferInfo = &buffer_info,
    };

    vkUpdateDescriptorSets(device, 1, &write, 0, 0);
  }

  SceneContext scene = {
    .pool = pool,
    .descriptor_layout = layout,
    .descriptors = sets,
    .ubos = ubos,
    .ubo_ptrs = ubo_ptrs,
    .pcr_size = sizeof(struct ScenePC),
  };

  return scene;
}

struct {
  bool forward;
  bool backward;
  bool left;
  bool right;
  bool up;
  bool down;
  bool turn_left;
  bool turn_right;
  bool turn_up;
  bool turn_down;
  bool roll_left;
  bool roll_right;
} key_flags = {
  .forward = false,
  .backward = false,
  .left = false,
  .right = false,

  .turn_left = false,
  .turn_right = false,
  .turn_up = false,
  .turn_down = false,
  .roll_left = false,
  .roll_right = false,
};

void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
  (void)scancode;
  (void)window;
  (void)mods;

  switch(key) {
  case GLFW_KEY_W:
    if(action == GLFW_PRESS) {
      key_flags.forward = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.forward = false;
    }
    break;

  case GLFW_KEY_A:
    if(action == GLFW_PRESS) {
      key_flags.left = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.left = false;
    }
    break;

  case GLFW_KEY_S:
    if(action == GLFW_PRESS) {
      key_flags.backward = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.backward = false;
    }
    break;

  case GLFW_KEY_D:
    if(action == GLFW_PRESS) {
      key_flags.right = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.right = false;
    }
    break;

  case GLFW_KEY_SPACE:
    if(action == GLFW_PRESS) {
      key_flags.up = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.up = false;
    }
    break;

  case GLFW_KEY_LEFT_SHIFT:
    if(action == GLFW_PRESS) {
      key_flags.down = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.down = false;
    }
    break;

  case GLFW_KEY_RIGHT:
    if(action == GLFW_PRESS) {
      key_flags.turn_right = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.turn_right = false;
    }
    break;

  case GLFW_KEY_LEFT:
    if(action == GLFW_PRESS) {
      key_flags.turn_left = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.turn_left = false;
    }
    break;

  case GLFW_KEY_UP:
    if(action == GLFW_PRESS) {
      key_flags.turn_up = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.turn_up = false;
    }
    break;

  case GLFW_KEY_DOWN:
    if(action == GLFW_PRESS) {
      key_flags.turn_down = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.turn_down = false;
    }
    break;

  case GLFW_KEY_Q:
    if(action == GLFW_PRESS) {
      key_flags.roll_left = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.roll_left = false;
    }
    break;

  case GLFW_KEY_E:
    if(action == GLFW_PRESS) {
      key_flags.roll_right = true;
    } else if(action == GLFW_RELEASE) {
      key_flags.roll_right = false;
    }
    break;
  }
}

vec3 world_position = {0.0f, 0.0f, 0.0f};
versor world_rotation = {-1.0f, 0.0f, 0.0f, 0.0f};

struct ScenePC get_scene_constants(vec3 world_position, versor world_rotation, float aspect_ratio, float time_delta) {
  vec3 movement_sum = {0.0f, 0.0f, 0.0f};

  if(key_flags.forward) {
    movement_sum[2] -= 1 * time_delta;
  }

  if(key_flags.backward) {
    movement_sum[2] += 1 * time_delta;
  }

  if(key_flags.right) {
    movement_sum[0] += 1 * time_delta;
  }

  if(key_flags.left) {
    movement_sum[0] -= 1 * time_delta;
  }

  if(key_flags.up) {
    movement_sum[1] -= 1 * time_delta;
  }

  if(key_flags.down) {
    movement_sum[1] += 1 * time_delta;
  }


  vec3 eular_rotation = {0.0f, 0.0f, 0.0f};
  if(key_flags.turn_right) {
    eular_rotation[0] -= 1 * time_delta;
  }

  if(key_flags.turn_left) {
    eular_rotation[0] += 1 * time_delta;
  }

  if(key_flags.turn_up) {
    eular_rotation[1] -= 1 * time_delta;
  }

  if(key_flags.turn_down) {
    eular_rotation[1] += 1 * time_delta;
  }

  if(key_flags.roll_right) {
    eular_rotation[2] += 1 * time_delta;
  }

  if(key_flags.roll_left) {
    eular_rotation[2] -= 1 * time_delta;
  }

  vec3 right = {1.0f, 0.0f, 0.0f};
  vec3 up = {0.0f, 1.0f, 0.0f};
  vec3 forward = {0.0f, 0.0f, 1.0f};
  glm_quat_rotatev(world_rotation, right, right);
  glm_quat_rotatev(world_rotation, up, up);
  glm_quat_rotatev(world_rotation, forward, forward);

  versor relative_rotation_y;
  glm_quatv(relative_rotation_y, eular_rotation[1], right);

  versor relative_rotation_x;
  glm_quatv(relative_rotation_x, eular_rotation[0], up);

  versor relative_rotation_z;
  glm_quatv(relative_rotation_z, eular_rotation[2], forward);

  glm_quat_mul(relative_rotation_x, world_rotation, world_rotation);
  glm_quat_mul(relative_rotation_y, world_rotation, world_rotation);
  glm_quat_mul(relative_rotation_z, world_rotation, world_rotation);

  vec3 movement_rot;
  glm_quat_rotatev(world_rotation, movement_sum, movement_rot);
  glm_vec3_add(movement_rot, world_position, world_position);

  struct ScenePC constants = {};

  glm_perspective(1.5708f, aspect_ratio, 0.01, 1000, constants.proj);
  glm_quat_look(world_position, world_rotation, constants.view);

  return constants;
}

VkResult draw_frame(VulkanContext* context, SceneContext* scene, uint32_t pipelines_count, GraphicsPipeline* pipelines, uint32_t* objects_counts, Object** objects, VkDeviceAddress object_buffer_addr) {
  struct ScenePC scene_constants = get_scene_constants(world_position, world_rotation, (float)context->swapchain_extent.width/(float)context->swapchain_extent.height, 0.01);

  VkResult result;
  result = vkWaitForFences(context->device, 1, &context->in_flight_fences[context->current_frame], VK_TRUE, UINT64_MAX);
  if(result != VK_SUCCESS) {
    return result;
  }

  uint32_t image_index;
  result = vkAcquireNextImageKHR(context->device, context->swapchain, UINT64_MAX, context->image_available_semaphores[context->current_frame], VK_NULL_HANDLE, &image_index);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = vkResetFences(context->device, 1, &context->in_flight_fences[context->current_frame]);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = vkResetCommandBuffer(context->swapchain_command_buffers[context->current_frame], 0);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = command_draw_scene(pipelines_count, pipelines, objects_counts, objects, context->current_frame, scene->descriptors, &scene_constants, context->swapchain_command_buffers[context->current_frame], context->render_pass, context->swapchain_framebuffers[image_index], context->swapchain_extent, object_buffer_addr, 0);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = vkResetCommandBuffer(context->offscreen_command_buffers[context->current_frame], 0);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = command_draw_scene(pipelines_count, pipelines, objects_counts, objects, context->current_frame, scene->descriptors, &scene_constants, context->offscreen_command_buffers[context->current_frame], context->g_renderpass, context->g_framebuffer, context->swapchain_extent, object_buffer_addr, 1);
  if(result != VK_SUCCESS) {
    return result;
  }

  VkPipelineStageFlags wait_stages[] = {VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT};
  VkSubmitInfo offscreen_submit_info = {
    .sType = VK_STRUCTURE_TYPE_SUBMIT_INFO,
    .waitSemaphoreCount = 1,
    .pWaitSemaphores = &context->image_available_semaphores[context->current_frame],
    .pWaitDstStageMask = wait_stages,
    .commandBufferCount = 1,
    .pCommandBuffers = &context->offscreen_command_buffers[context->current_frame],
    .signalSemaphoreCount = 1,
    .pSignalSemaphores = &context->offscreen_complete_semaphores[0],
  };

  VkSubmitInfo submit_info = {
    .sType = VK_STRUCTURE_TYPE_SUBMIT_INFO,
    .waitSemaphoreCount = 1,
    .pWaitSemaphores = &context->offscreen_complete_semaphores[0],
    .pWaitDstStageMask = wait_stages,
    .commandBufferCount = 1,
    .pCommandBuffers = &context->swapchain_command_buffers[context->current_frame],
    .signalSemaphoreCount = 1,
    .pSignalSemaphores = &context->render_finished_semaphores[context->current_frame],
  };

  result = vkQueueSubmit(context->graphics_queue.handle, 1, &offscreen_submit_info, 0);
  if(result != VK_SUCCESS) {
    return result;
  }

  result = vkQueueSubmit(context->graphics_queue.handle, 1, &submit_info, context->in_flight_fences[context->current_frame]);
  if(result != VK_SUCCESS) {
    return result;
  }

  VkPresentInfoKHR present_info = {
    .sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR,
    .waitSemaphoreCount = 1,
    .pWaitSemaphores = &context->render_finished_semaphores[context->current_frame],
    .swapchainCount = 1,
    .pSwapchains = &context->swapchain,
    .pImageIndices = &image_index,
    .pResults = 0,
  };

  return vkQueuePresentKHR(context->present_queue.handle, &present_info);
}

Object create_simple_mesh_object(PlyMesh ply_mesh, GraphicsPipeline* simple_mesh_pipeline, VkPhysicalDeviceMemoryProperties memories, VkDevice device, VkCommandPool transfer_pool, Queue transfer_queue) {
  Object zero = {};

  GPUPage* mesh_memory = NULL;
  VkResult result = gpu_page_allocate(device, memories, 100000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT, 0, &mesh_memory);
  if(result != VK_SUCCESS) {
    return zero;
  }

  GPUPage* transfer_memory = NULL;
  result = gpu_page_allocate(device, memories, 200000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, 0, &transfer_memory);
  if(result != VK_SUCCESS) {
    return zero;
  }

  GPUBuffer transfer_buffer = {0};
  result = gpu_buffer_malloc(device, transfer_memory, 100000, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, &transfer_buffer);
  if(result != VK_SUCCESS) {
    return zero;
  }

  struct Vertex* tmp = malloc(sizeof(struct Vertex)*ply_mesh.vertex_count);
  for(uint32_t i = 0; i < ply_mesh.vertex_count; i++) {
    tmp[i].pos[0] = ply_mesh.position[i][0];
    tmp[i].pos[1] = ply_mesh.position[i][1];
    tmp[i].pos[2] = ply_mesh.position[i][2];
    tmp[i].color[0] = ply_mesh.colour[i][0];
    tmp[i].color[1] = ply_mesh.colour[i][1];
    tmp[i].color[2] = ply_mesh.colour[i][2];
  }

  Mesh* mesh = load_mesh_to_buffer(device, mesh_memory, transfer_buffer, ply_mesh.vertex_count, sizeof(struct Vertex), (void*)tmp, ply_mesh.index_count, sizeof(uint16_t), (void*)ply_mesh.index, transfer_pool, transfer_queue);
  free(tmp);
  if(mesh == 0) {
    return zero;
  }

  Object object = create_renderable(mesh, simple_mesh_pipeline);
  if(object.attributes.buckets == 0) {
    return zero;
  }

  Position* position = malloc(sizeof(Position));
  if(position == 0) {
    return zero;
  }
  glm_quat_identity(position->rotation);
  position->scale[0] = 1.f;
  position->scale[1] = 1.f;
  position->scale[2] = 1.f;
  position->position[0] = 0.0f;
  position->position[1] = 0.0f;
  position->position[2] = 1.1f;
  bool map_result = map_add(&object.attributes, ATTRIBUTE_ID_POSITION, position);
  if(map_result == 0) {
    return zero;
  }

  return object;
}

Object create_texture_mesh_object(GraphicsPipeline* texture_mesh_pipeline, VkPhysicalDeviceMemoryProperties memories, VkDevice device, VkCommandPool transfer_pool, Queue transfer_queue) {
  Object zero = {};

  GPUPage* mesh_memory = NULL;
  VkResult result = gpu_page_allocate(device, memories, 100000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT, 0, &mesh_memory);
  if(result != VK_SUCCESS) {
    return zero;
  }

  GPUPage* transfer_memory = NULL;
  result = gpu_page_allocate(device, memories, 100000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, 0, &transfer_memory);
  if(result != VK_SUCCESS) {
    return zero;
  }

  GPUBuffer transfer_buffer = {0};
  result = gpu_buffer_malloc(device, transfer_memory, 10000, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, &transfer_buffer);
  if(result != VK_SUCCESS) {
    return zero;
  }

  Mesh* mesh = load_mesh_to_buffer(device, mesh_memory, transfer_buffer, 4, sizeof(struct TextureVertex), (void*)texture_vertices, 6, sizeof(uint16_t), (void*)indices, transfer_pool, transfer_queue);
  if(mesh == 0) {
    return zero;
  }

  Object object = create_renderable(mesh, texture_mesh_pipeline);
  if(object.attributes.buckets == 0) {
    return zero;
  }

  Position* position = malloc(sizeof(Position));
  if(position == 0) {
    return zero;
  }
  glm_quat_identity(position->rotation);
  position->scale[0] = 0.5f;
  position->scale[1] = 0.5f;
  position->scale[2] = 0.5f;
  position->position[0] = 0.0f;
  position->position[1] = 0.0f;
  position->position[2] = 1.0f;
  bool map_result = map_add(&object.attributes, ATTRIBUTE_ID_POSITION, position);
  if(map_result == 0) {
    return zero;
  }

  return object;
}

void main_loop(PlyMesh ply_mesh, GLFWwindow* window, VulkanContext* context) {
  SceneContext scene = create_scene_context(context->device, context->memories, context->max_frames_in_flight);
  if(scene.pool == VK_NULL_HANDLE) {
    return;
  }

  GraphicsPipeline simple_mesh_pipeline = {0};
  GraphicsPipeline texture_mesh_pipeline = {0};
  VkResult result = create_simple_mesh_pipeline(context->device, context->swapchain_extent, context->render_pass, context->g_renderpass, scene.descriptor_layout, context->max_frames_in_flight, &simple_mesh_pipeline);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create simple mesh material: %s\n", string_VkResult(result));
    return;
  }

  Object triangle_object = create_simple_mesh_object(ply_mesh, &simple_mesh_pipeline, context->memories, context->device, context->transfer_command_pool, context->transfer_queue);
  if(triangle_object.attributes.buckets == 0) {
    fprintf(stderr, "failed to create simple mesh object\n");
    return;
  }

  result = create_texture_mesh_pipeline(context->device, context->memories, context->swapchain_extent, context->render_pass, context->g_renderpass, scene.descriptor_layout, context->max_frames_in_flight, context->transfer_command_pool, context->transfer_queue, context->graphics_queue, context->extra_graphics_pool, &texture_mesh_pipeline);
  if(result != VK_SUCCESS) {
    fprintf(stderr, "failed to create texture mesh material\n");
    return;
  }

  Object triangle_object_textured = create_texture_mesh_object(&texture_mesh_pipeline, context->memories, context->device, context->transfer_command_pool, context->transfer_queue);
  if(triangle_object_textured.attributes.buckets == 0) {
    fprintf(stderr, "failed to create texture mesh object\n");
    return;
  }

  Object* objects[] = {&triangle_object, &triangle_object_textured};
  GraphicsPipeline pipelines[] = {simple_mesh_pipeline, texture_mesh_pipeline};
  uint32_t objects_counts[] = {1, 1};

  GPUPage* memory = NULL;
  result = gpu_page_allocate(context->device, context->memories, 100000, 0xFFFFFFFF, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, VK_MEMORY_ALLOCATE_DEVICE_ADDRESS_BIT, &memory);
  if(result != VK_SUCCESS) {
    return;
  }

  GPUBuffer buffer = {0};
  result = gpu_buffer_malloc(context->device, memory, sizeof(mat4)*100, VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, &buffer);
  if(result != VK_SUCCESS) {
    return;
  }

  mat4* model_1 = memory->ptr + buffer.memory->offset;
  mat4* model_2 = memory->ptr + buffer.memory->offset + sizeof(mat4);
  glm_mat4_identity(*model_1);
  glm_translate_x(*model_1, 1.0f);
  glm_mat4_identity(*model_2);
  glm_translate_x(*model_2, -1.0f);

  VkBufferDeviceAddressInfo addr_info = {
    .sType = VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO,
    .buffer = buffer.handle,
  };
  VkDeviceAddress object_address = vkGetBufferDeviceAddress(context->device, &addr_info);

  context->current_frame = 0;
  while(!glfwWindowShouldClose(window)) {
    glfwPollEvents();

    VkResult result = draw_frame(context, &scene, sizeof(pipelines)/sizeof(GraphicsPipeline), pipelines, objects_counts, objects, object_address);
    if(result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR) {
      vkDeviceWaitIdle(context->device);
      recreate_swapchain(context);
    } else if(result != VK_SUCCESS) {
      fprintf(stderr, "draw_frame error %d\n", result);
      return;
    }

    context->current_frame += 1;
    if(context->current_frame >= context->max_frames_in_flight) {
      context->current_frame = 0;
    }
  }

  vkDeviceWaitIdle(context->device);
}

void cleanup(GLFWwindow* window, VulkanContext* context) {
  if(context != 0) {
    if(context->instance != VK_NULL_HANDLE) {
      if(context->extra_graphics_pool != VK_NULL_HANDLE) {
        vkDestroyCommandPool(context->device, context->extra_graphics_pool, 0);
      }

      if(context->render_pass != VK_NULL_HANDLE) {
        vkDestroyRenderPass(context->device, context->render_pass, 0);
      }

      if(context->depth_image != VK_NULL_HANDLE) {
        vkDestroyImage(context->device, context->depth_image, 0);
      }

      for(uint32_t i = 0; i < context->swapchain_image_count; i++) {
        vkDestroyFramebuffer(context->device, context->swapchain_framebuffers[i], 0);
        vkDestroyImageView(context->device, context->swapchain_image_views[i], 0);
      }

      for(uint32_t i = 0; i < context->max_frames_in_flight; i++) {
        vkDestroySemaphore(context->device, context->image_available_semaphores[i], 0);
        vkDestroySemaphore(context->device, context->render_finished_semaphores[i], 0);
        vkDestroyFence(context->device, context->in_flight_fences[i], 0);
      }

      if(context->depth_image_view != VK_NULL_HANDLE) {
        vkDestroyImageView(context->device, context->depth_image_view, 0);
      }

      if(context->depth_image_memory != VK_NULL_HANDLE) {
        vkFreeMemory(context->device, context->depth_image_memory, 0);
      }

      if(context->graphics_command_pool != VK_NULL_HANDLE) {
        vkDestroyCommandPool(context->device, context->graphics_command_pool, 0);
      }

      if(context->transfer_command_pool != VK_NULL_HANDLE) {
        vkDestroyCommandPool(context->device, context->transfer_command_pool, 0);
      }

      if(context->swapchain_command_buffers != NULL) {
        free(context->swapchain_command_buffers);
      }

      if(context->swapchain != VK_NULL_HANDLE) {
        vkDestroySwapchainKHR(context->device, context->swapchain, 0);
      }

      if(context->surface != VK_NULL_HANDLE) {
        vkDestroySurfaceKHR(context->instance, context->surface, 0);
      }

      if(context->device != VK_NULL_HANDLE) {
        vkDestroyDevice(context->device, 0);
      }

      if(context->debug_messenger != VK_NULL_HANDLE) {
        PFN_vkDestroyDebugUtilsMessengerEXT destroy_messenger = (PFN_vkDestroyDebugUtilsMessengerEXT)vkGetInstanceProcAddr(context->instance, "vkDestroyDebugUtilsMessengerEXT");
        destroy_messenger(context->instance, context->debug_messenger, 0);
      }

      vkDestroyInstance(context->instance, 0);
    }
    free(context);
  }

  if(window != 0) {
    glfwDestroyWindow(window);
    glfwTerminate();
  }
}

int main() {
  PlyMesh monkey = ply_load_mesh("monkey.ply", default_ply_mappings);
  if(monkey.position == 0) {
    fprintf(stderr, "failed to load %s\n", "monkey.ply");
  }

  GLFWwindow* window = init_window(800, 600);
  if(window == 0) {
    fprintf(stderr, "failed to initialize glfw window\n");
    return 1;
  }

  VulkanContext* context = init_vulkan(window, 2);
  if (context == 0) {
    fprintf(stderr, "failed to initialize vulkan context\n");
    return 2;
  }

  glfwSetKeyCallback(window, key_callback);
  main_loop(monkey, window, context);

  cleanup(window, context);

  return 0;
}