#if !defined(LD_VULKAN_CORE_H_)
#define LD_VULKAN_CORE_H_

#if OS_WINDOWS
	#define VK_USE_PLATFORM_WIN32_KHR 1

	#if defined(CreateSemaphore)
		// Sigh
		#undef CreateSemaphore
	#endif
#elif OS_LINUX
	#define VK_USE_PLATFORM_XLIB_KHR    1
	#define VK_USE_PLATFORM_WAYLAND_KHR 1
#endif

#define VK_NO_PROTOTYPES 1
#include <vulkan/vulkan.h>

#define VK_FRAMES_IN_FLIGHT 2

typedef struct Vk_Frame Vk_Frame;
struct Vk_Frame {
	VkCommandPool   pool;
	VkCommandBuffer cmd;

	VkSemaphore acquire, complete;
	VkFence fence;

	U32 image; // swapchain image index
};

typedef struct Vk_Context Vk_Context;
struct Vk_Context {
	void *lib;
	PFN_vkGetInstanceProcAddr GetInstanceProcAddr;
	PFN_vkCreateInstance      CreateInstance;

	#define VK_INSTANCE_FUNCTIONS
	#define VK_DEVICE_FUNCTIONS
	#define VK_FUNC(x) PFN_vk##x x
		#include "functions.h"
	#undef VK_FUNC

	VkResult   err;
	VkInstance instance;

	VkSurfaceKHR surface;

	VkPhysicalDevice gpu;
	VkDevice device;

	U32 n_frames; // monotonically increasing
	Vk_Frame frames[VK_FRAMES_IN_FLIGHT];

	struct {
		U32 family;
		VkQueue handle;
	} queue;

	struct {
		VkSwapchainKHR handle;

		U32 n_images;
		VkImage     images[8];
		VkImageView views[8];

		VkSurfaceFormatKHR format;

		U32 width;
		U32 height;
	} swapchain;
};

extern Vk_Context vk;

static bool Vk_Setup(SDL_Window *window);
static Vk_Frame *Vk_FrameBegin(SDL_Window *window);
static void Vk_FrameEnd();

#endif  // LD_VULKAN_CORE_H_