godot/drivers/vulkan/vulkan_context.h

/*************************************************************************/
/*  vulkan_context.h                                                     */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef VULKAN_CONTEXT_H
#define VULKAN_CONTEXT_H

#include "core/error/error_list.h"
#include "core/os/mutex.h"
#include "core/string/ustring.h"
#include "core/templates/map.h"
#include "core/templates/rid_owner.h"
#include "servers/display_server.h"

#include <vulkan/vulkan.h>

class VulkanContext {
public:
	struct SubgroupCapabilities {
		uint32_t size;
		VkShaderStageFlags supportedStages;
		VkSubgroupFeatureFlags supportedOperations;
		VkBool32 quadOperationsInAllStages;

		uint32_t supported_stages_flags_rd() const;
		String supported_stages_desc() const;
		uint32_t supported_operations_flags_rd() const;
		String supported_operations_desc() const;
	};

	struct MultiviewCapabilities {
		bool is_supported;
		bool geometry_shader_is_supported;
		bool tessellation_shader_is_supported;
		uint32_t max_view_count;
		uint32_t max_instance_count;
	};

private:
	enum {
		MAX_EXTENSIONS = 128,
		MAX_LAYERS = 64,
		FRAME_LAG = 2
	};

	VkInstance inst = VK_NULL_HANDLE;
	VkPhysicalDevice gpu = VK_NULL_HANDLE;
	VkPhysicalDeviceProperties gpu_props;
	uint32_t queue_family_count = 0;
	VkQueueFamilyProperties *queue_props = nullptr;
	VkDevice device = VK_NULL_HANDLE;
	bool device_initialized = false;
	bool inst_initialized = false;

	// Vulkan 1.0 doesn't return version info so we assume this by default until we know otherwise
	uint32_t vulkan_major = 1;
	uint32_t vulkan_minor = 0;
	SubgroupCapabilities subgroup_capabilities;
	MultiviewCapabilities multiview_capabilities;

	String device_vendor;
	String device_name;
	String pipeline_cache_id;
	uint32_t device_api_version = 0;

	bool buffers_prepared = false;

	// Present queue.
	bool queues_initialized = false;
	uint32_t graphics_queue_family_index = 0;
	uint32_t present_queue_family_index = 0;
	bool separate_present_queue = false;
	VkQueue graphics_queue = VK_NULL_HANDLE;
	VkQueue present_queue = VK_NULL_HANDLE;
	VkColorSpaceKHR color_space;
	VkFormat format;
	VkSemaphore draw_complete_semaphores[FRAME_LAG];
	VkSemaphore image_ownership_semaphores[FRAME_LAG];
	int frame_index = 0;
	VkFence fences[FRAME_LAG];
	VkPhysicalDeviceMemoryProperties memory_properties;
	VkPhysicalDeviceFeatures physical_device_features;

	typedef struct {
		VkImage image;
		VkCommandBuffer graphics_to_present_cmd;
		VkImageView view;
		VkFramebuffer framebuffer;
	} SwapchainImageResources;

	struct Window {
		VkSurfaceKHR surface = VK_NULL_HANDLE;
		VkSwapchainKHR swapchain = VK_NULL_HANDLE;
		SwapchainImageResources *swapchain_image_resources = VK_NULL_HANDLE;
		VkPresentModeKHR presentMode = VK_PRESENT_MODE_FIFO_KHR;
		VkSemaphore image_acquired_semaphores[FRAME_LAG];
		bool semaphore_acquired = false;
		uint32_t current_buffer = 0;
		int width = 0;
		int height = 0;
		DisplayServer::VSyncMode vsync_mode = DisplayServer::VSYNC_ENABLED;
		VkCommandPool present_cmd_pool = VK_NULL_HANDLE; // For separate present queue.
		VkRenderPass render_pass = VK_NULL_HANDLE;
	};

	struct LocalDevice {
		bool waiting = false;
		VkDevice device = VK_NULL_HANDLE;
		VkQueue queue = VK_NULL_HANDLE;
	};

	RID_Owner<LocalDevice, true> local_device_owner;

	Map<DisplayServer::WindowID, Window> windows;
	uint32_t swapchainImageCount = 0;

	// Commands.

	bool prepared = false;

	Vector<VkCommandBuffer> command_buffer_queue;
	int command_buffer_count = 1;

	// Extensions.

	bool VK_KHR_incremental_present_enabled = true;
	bool VK_GOOGLE_display_timing_enabled = true;
	uint32_t enabled_extension_count = 0;
	const char *extension_names[MAX_EXTENSIONS];
	bool enabled_debug_utils = false;

	/**
	 * True if VK_EXT_debug_report extension is used. VK_EXT_debug_report is deprecated but it is
	 * still used if VK_EXT_debug_utils is not available.
	 */
	bool enabled_debug_report = false;

	PFN_vkCreateDebugUtilsMessengerEXT CreateDebugUtilsMessengerEXT;
	PFN_vkDestroyDebugUtilsMessengerEXT DestroyDebugUtilsMessengerEXT;
	PFN_vkSubmitDebugUtilsMessageEXT SubmitDebugUtilsMessageEXT;
	PFN_vkCmdBeginDebugUtilsLabelEXT CmdBeginDebugUtilsLabelEXT;
	PFN_vkCmdEndDebugUtilsLabelEXT CmdEndDebugUtilsLabelEXT;
	PFN_vkCmdInsertDebugUtilsLabelEXT CmdInsertDebugUtilsLabelEXT;
	PFN_vkSetDebugUtilsObjectNameEXT SetDebugUtilsObjectNameEXT;
	PFN_vkCreateDebugReportCallbackEXT CreateDebugReportCallbackEXT;
	PFN_vkDebugReportMessageEXT DebugReportMessageEXT;
	PFN_vkDestroyDebugReportCallbackEXT DestroyDebugReportCallbackEXT;
	PFN_vkGetPhysicalDeviceSurfaceSupportKHR fpGetPhysicalDeviceSurfaceSupportKHR;
	PFN_vkGetPhysicalDeviceSurfaceCapabilitiesKHR fpGetPhysicalDeviceSurfaceCapabilitiesKHR;
	PFN_vkGetPhysicalDeviceSurfaceFormatsKHR fpGetPhysicalDeviceSurfaceFormatsKHR;
	PFN_vkGetPhysicalDeviceSurfacePresentModesKHR fpGetPhysicalDeviceSurfacePresentModesKHR;
	PFN_vkCreateSwapchainKHR fpCreateSwapchainKHR;
	PFN_vkDestroySwapchainKHR fpDestroySwapchainKHR;
	PFN_vkGetSwapchainImagesKHR fpGetSwapchainImagesKHR;
	PFN_vkAcquireNextImageKHR fpAcquireNextImageKHR;
	PFN_vkQueuePresentKHR fpQueuePresentKHR;
	PFN_vkGetRefreshCycleDurationGOOGLE fpGetRefreshCycleDurationGOOGLE;
	PFN_vkGetPastPresentationTimingGOOGLE fpGetPastPresentationTimingGOOGLE;

	VkDebugUtilsMessengerEXT dbg_messenger = VK_NULL_HANDLE;
	VkDebugReportCallbackEXT dbg_debug_report = VK_NULL_HANDLE;

	Error _obtain_vulkan_version();
	Error _initialize_extensions();
	Error _check_capabilities();

	VkBool32 _check_layers(uint32_t check_count, const char *const *check_names, uint32_t layer_count, VkLayerProperties *layers);
	static VKAPI_ATTR VkBool32 VKAPI_CALL _debug_messenger_callback(
			VkDebugUtilsMessageSeverityFlagBitsEXT messageSeverity,
			VkDebugUtilsMessageTypeFlagsEXT messageType,
			const VkDebugUtilsMessengerCallbackDataEXT *pCallbackData,
			void *pUserData);

	static VKAPI_ATTR VkBool32 VKAPI_CALL _debug_report_callback(
			VkDebugReportFlagsEXT flags,
			VkDebugReportObjectTypeEXT objectType,
			uint64_t object,
			size_t location,
			int32_t messageCode,
			const char *pLayerPrefix,
			const char *pMessage,
			void *pUserData);

	Error _create_physical_device();

	Error _initialize_queues(VkSurfaceKHR p_surface);

	Error _create_device();

	Error _clean_up_swap_chain(Window *window);

	Error _update_swap_chain(Window *window);

	Error _create_swap_chain();
	Error _create_semaphores();

protected:
	virtual const char *_get_platform_surface_extension() const = 0;

	virtual Error _window_create(DisplayServer::WindowID p_window_id, DisplayServer::VSyncMode p_vsync_mode, VkSurfaceKHR p_surface, int p_width, int p_height);

	virtual bool _use_validation_layers();

	Error _get_preferred_validation_layers(uint32_t *count, const char *const **names);

	VkInstance _get_instance() {
		return inst;
	}

public:
	uint32_t get_vulkan_major() const { return vulkan_major; };
	uint32_t get_vulkan_minor() const { return vulkan_minor; };
	SubgroupCapabilities get_subgroup_capabilities() const { return subgroup_capabilities; };
	MultiviewCapabilities get_multiview_capabilities() const { return multiview_capabilities; };

	VkDevice get_device();
	VkPhysicalDevice get_physical_device();
	int get_swapchain_image_count() const;
	uint32_t get_graphics_queue() const;

	void window_resize(DisplayServer::WindowID p_window_id, int p_width, int p_height);
	int window_get_width(DisplayServer::WindowID p_window = 0);
	int window_get_height(DisplayServer::WindowID p_window = 0);
	void window_destroy(DisplayServer::WindowID p_window_id);
	VkFramebuffer window_get_framebuffer(DisplayServer::WindowID p_window = 0);
	VkRenderPass window_get_render_pass(DisplayServer::WindowID p_window = 0);

	RID local_device_create();
	VkDevice local_device_get_vk_device(RID p_local_device);
	void local_device_push_command_buffers(RID p_local_device, const VkCommandBuffer *p_buffers, int p_count);
	void local_device_sync(RID p_local_device);
	void local_device_free(RID p_local_device);

	VkFormat get_screen_format() const;
	VkPhysicalDeviceLimits get_device_limits() const;

	void set_setup_buffer(const VkCommandBuffer &pCommandBuffer);
	void append_command_buffer(const VkCommandBuffer &pCommandBuffer);
	void resize_notify();
	void flush(bool p_flush_setup = false, bool p_flush_pending = false);
	Error prepare_buffers();
	Error swap_buffers();
	Error initialize();

	void command_begin_label(VkCommandBuffer p_command_buffer, String p_label_name, const Color p_color);
	void command_insert_label(VkCommandBuffer p_command_buffer, String p_label_name, const Color p_color);
	void command_end_label(VkCommandBuffer p_command_buffer);
	void set_object_name(VkObjectType p_object_type, uint64_t p_object_handle, String p_object_name);

	String get_device_vendor_name() const;
	String get_device_name() const;
	String get_device_pipeline_cache_uuid() const;

	void set_vsync_mode(DisplayServer::WindowID p_window, DisplayServer::VSyncMode p_mode);
	DisplayServer::VSyncMode get_vsync_mode(DisplayServer::WindowID p_window = 0) const;

	VulkanContext();
	virtual ~VulkanContext();
};

#endif // VULKAN_DEVICE_H