UwU-Engine/UwURenderEngine/RenderEngine/UwURenderEngine.hpp

#pragma once

#include "RenderEngineBase.hpp"
#include "ModelManager.hpp"

#include <optional>
#include <vector>
#include <string>
#include <memory>

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

class GPU_GarbageCollector;

class UwURenderEngine : public RenderEngineBase
{
    struct QueueFamilyIndices
    {
        std::optional<uint32_t> graphics_family;
        std::optional<uint32_t> present_family;
        std::optional<uint32_t> transfer_family;
    };
    struct SwapchainSupportDetails
    {
        VkSurfaceCapabilitiesKHR capabilities;
        std::vector<VkSurfaceFormatKHR> formats;
        std::vector<VkPresentModeKHR> present_modes;
    };
    struct UniformBufferObject {
        glm::mat4 model;
        glm::mat4 view;
        glm::mat4 proj;
    };
    
    const std::vector<ModelManager::Vertex> vertices_ = {
        {{-0.5f, -0.5f, 0.5f}, {1.0f, 0.0f, 0.0f}},
        {{0.5f, -0.5f, 0.5f}, {0.0f, 1.0f, 0.0f}},
        {{0.5f, 0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}},
        {{-0.5f, 0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}},
        {{-0.5f, -0.5f, -0.5f}, {1.0f, 0.0f, 0.0f}},
        {{0.5f, -0.5f, -0.5f}, {0.0f, 1.0f, 0.0f}},
        {{0.5f, 0.5f, -0.5f}, {0.0f, 0.0f, 1.0f}},
        {{-0.5f, 0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}}
    };
    const std::vector<uint16_t> indices_ = {
        0, 1, 2, 2, 3, 0,
        2, 1, 5, 5, 6, 2,
        0, 3, 7, 7, 4, 0,
        3, 2, 6, 6, 7, 3,
        7, 6, 5, 5, 4, 7,
        4, 5, 1, 1, 0, 4
    };
    
    static const std::vector<const char*> deviceExtensions;
    
    int current_frame_ = 0;
    

    CoreInstance& core_;
    std::shared_ptr<ModelManager> model_manager_;
    std::shared_ptr<GPU_GarbageCollector> garbage_collector_;
    
    VkInstance instance_ = VK_NULL_HANDLE;
    VkSurfaceKHR surface_ = VK_NULL_HANDLE;
    VkPhysicalDevice physical_device_ = VK_NULL_HANDLE;
    VkDevice device_ = VK_NULL_HANDLE;
    VkQueue graphics_queue_ = VK_NULL_HANDLE;
    VkQueue present_queue_ = VK_NULL_HANDLE;
    VkQueue transfer_queue_ = VK_NULL_HANDLE;
    VkSwapchainKHR swapchain_ = VK_NULL_HANDLE;
    std::vector<VkImage> swapchain_images_;
    VkFormat swapchain_image_format_;
    VkExtent2D swapchain_extent_;
    std::vector<VkImageView> swapchain_image_views_;
    VkRenderPass render_pass_ = VK_NULL_HANDLE;
    VkDescriptorSetLayout ubo_layout_binding_ = VK_NULL_HANDLE;
    VkDescriptorPool descriptor_pool_ = VK_NULL_HANDLE;
    std::vector<VkDescriptorSet> descriptor_sets_;
    VkPipelineLayout pipeline_layout_ = VK_NULL_HANDLE;
    VkPipeline graphics_pipeline_ = VK_NULL_HANDLE;
    std::vector<VkFramebuffer> framebuffers_;
    VkCommandPool command_pool_ = VK_NULL_HANDLE;
    std::vector<VkCommandBuffer> command_buffers_;
    VkBuffer vertex_buffer_ = VK_NULL_HANDLE;
    VkDeviceMemory vertex_buffer_memory_ = VK_NULL_HANDLE;
    VkBuffer index_buffer_ = VK_NULL_HANDLE;
    VkDeviceMemory index_buffer_memory_ = VK_NULL_HANDLE;
    std::vector<VkBuffer> uniform_buffers_;
    std::vector<VkDeviceMemory> uniform_buffers_memory_;
    std::vector<void*> uniform_buffers_mapped_;

    // Sync objects
    std::vector<VkSemaphore> image_available_semaphores_, render_finished_semaphores_;
    std::vector<VkFence> in_flight_fences_;
    
#ifdef _DEBUG
    VkResult enable_layer_validation(const VkDebugUtilsMessengerCreateInfoEXT* create_info);
    VkDebugUtilsMessengerEXT debug_messenger_;
#endif
    SwapchainSupportDetails query_swapchain_details() const;
    
    static std::vector<const char*> get_required_extensions();
    static bool is_device_suitable(VkPhysicalDevice device, VkSurfaceKHR surface);
    static bool check_device_extensions_support(VkPhysicalDevice device);
    static QueueFamilyIndices find_queue_family_indices(VkPhysicalDevice physical_device, VkSurfaceKHR surface);
    static VkSurfaceFormatKHR choose_surface_format(const std::vector<VkSurfaceFormatKHR>& surface_formats);
    static VkPresentModeKHR choose_present_mode(const std::vector<VkPresentModeKHR>& present_modes, VkPresentModeKHR desired_present_mode);
    VkShaderModule create_shader_module(const std::string& code) const;
    static std::vector<uint32_t> get_unique_family_indices(const QueueFamilyIndices& indices);
    
    void create_instance();
    void create_surface();
    void pick_physical_device();
    void create_logical_device();
    void create_swapchain();
    void create_image_views();
    void create_render_pass();
    void create_description_set_layout();
    void create_uniform_buffers();
    void create_descriptor_pool();
    void create_descriptor_sets();
    void create_graphics_pipeline();
    void create_framebuffers();
    void create_command_pool();
    void allocate_command_buffers();
    void create_sync_objects();
    void allocate_vertex_buffer();
    void allocate_index_buffer();
    
    void record_command_buffer(VkCommandBuffer command_buffer, uint32_t image_index) const;
    void update_uniform_buffer(uint32_t current_frame);
    void draw_frame();
public:
    // Can throw the exception
    explicit UwURenderEngine(CoreInstance& core);
    ~UwURenderEngine() override;

    void start() override;
    void stop_render() const override;

    std::shared_ptr<ModelManager> GetModelManager() const { return model_manager_; }
};