/*
 * Copyright © 2016 Red Hat.
 * Copyright © 2016 Bas Nieuwenhuizen
 *
 * based mostly on anv driver which is:
 * Copyright © 2015 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <X11/Xlib-xcb.h>
#include <X11/xshmfence.h>
#include <xcb/xcb.h>
#include <xcb/dri3.h>
#include <xcb/present.h>
#include <errno.h>

#include <unistd.h>
#include "radv_wsi.h"
#include "vk_format.h"
#include "util/hash_table.h"

struct wsi_x11_connection {
	bool has_dri3;
	bool has_present;
};

struct wsi_x11 {
	struct radv_wsi_interface base;

	pthread_mutex_t                              mutex;
	/* Hash table of xcb_connection -> wsi_x11_connection mappings */
	struct hash_table *connections;
};

static struct wsi_x11_connection *
wsi_x11_connection_create(struct radv_physical_device *device,
                          xcb_connection_t *conn)
{
	xcb_query_extension_cookie_t dri3_cookie, pres_cookie;
	xcb_query_extension_reply_t *dri3_reply, *pres_reply;

	struct wsi_x11_connection *wsi_conn =
		vk_alloc(&device->instance->alloc, sizeof(*wsi_conn), 8,
			   VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);
	if (!wsi_conn)
		return NULL;

	dri3_cookie = xcb_query_extension(conn, 4, "DRI3");
	pres_cookie = xcb_query_extension(conn, 7, "PRESENT");

	dri3_reply = xcb_query_extension_reply(conn, dri3_cookie, NULL);
	pres_reply = xcb_query_extension_reply(conn, pres_cookie, NULL);
	if (dri3_reply == NULL || pres_reply == NULL) {
		free(dri3_reply);
		free(pres_reply);
		vk_free(&device->instance->alloc, wsi_conn);
		return NULL;
	}

	wsi_conn->has_dri3 = dri3_reply->present != 0;
	wsi_conn->has_present = pres_reply->present != 0;

	free(dri3_reply);
	free(pres_reply);

	return wsi_conn;
}

static void
wsi_x11_connection_destroy(struct radv_physical_device *device,
                           struct wsi_x11_connection *conn)
{
	vk_free(&device->instance->alloc, conn);
}

static struct wsi_x11_connection *
wsi_x11_get_connection(struct radv_physical_device *device,
                       xcb_connection_t *conn)
{
	struct wsi_x11 *wsi =
		(struct wsi_x11 *)device->wsi[VK_ICD_WSI_PLATFORM_XCB];

	pthread_mutex_lock(&wsi->mutex);

	struct hash_entry *entry = _mesa_hash_table_search(wsi->connections, conn);
	if (!entry) {
		/* We're about to make a bunch of blocking calls.  Let's drop the
		 * mutex for now so we don't block up too badly.
		 */
		pthread_mutex_unlock(&wsi->mutex);

		struct wsi_x11_connection *wsi_conn =
			wsi_x11_connection_create(device, conn);

		pthread_mutex_lock(&wsi->mutex);

		entry = _mesa_hash_table_search(wsi->connections, conn);
		if (entry) {
			/* Oops, someone raced us to it */
			wsi_x11_connection_destroy(device, wsi_conn);
		} else {
			entry = _mesa_hash_table_insert(wsi->connections, conn, wsi_conn);
		}
	}

	pthread_mutex_unlock(&wsi->mutex);

	return entry->data;
}

static const VkSurfaceFormatKHR formats[] = {
	{ .format = VK_FORMAT_B8G8R8A8_UNORM, },
	{ .format = VK_FORMAT_B8G8R8A8_SRGB, },
};

static const VkPresentModeKHR present_modes[] = {
	VK_PRESENT_MODE_MAILBOX_KHR,
};

static xcb_screen_t *
get_screen_for_root(xcb_connection_t *conn, xcb_window_t root)
{
	xcb_screen_iterator_t screen_iter =
		xcb_setup_roots_iterator(xcb_get_setup(conn));

	for (; screen_iter.rem; xcb_screen_next (&screen_iter)) {
		if (screen_iter.data->root == root)
			return screen_iter.data;
	}

	return NULL;
}

static xcb_visualtype_t *
screen_get_visualtype(xcb_screen_t *screen, xcb_visualid_t visual_id,
                      unsigned *depth)
{
	xcb_depth_iterator_t depth_iter =
		xcb_screen_allowed_depths_iterator(screen);

	for (; depth_iter.rem; xcb_depth_next (&depth_iter)) {
		xcb_visualtype_iterator_t visual_iter =
			xcb_depth_visuals_iterator (depth_iter.data);

		for (; visual_iter.rem; xcb_visualtype_next (&visual_iter)) {
			if (visual_iter.data->visual_id == visual_id) {
				if (depth)
					*depth = depth_iter.data->depth;
				return visual_iter.data;
			}
		}
	}

	return NULL;
}

static xcb_visualtype_t *
connection_get_visualtype(xcb_connection_t *conn, xcb_visualid_t visual_id,
                          unsigned *depth)
{
	xcb_screen_iterator_t screen_iter =
		xcb_setup_roots_iterator(xcb_get_setup(conn));

	/* For this we have to iterate over all of the screens which is rather
	 * annoying.  Fortunately, there is probably only 1.
	 */
	for (; screen_iter.rem; xcb_screen_next (&screen_iter)) {
		xcb_visualtype_t *visual = screen_get_visualtype(screen_iter.data,
								 visual_id, depth);
		if (visual)
			return visual;
	}

	return NULL;
}

static xcb_visualtype_t *
get_visualtype_for_window(xcb_connection_t *conn, xcb_window_t window,
                          unsigned *depth)
{
	xcb_query_tree_cookie_t tree_cookie;
	xcb_get_window_attributes_cookie_t attrib_cookie;
	xcb_query_tree_reply_t *tree;
	xcb_get_window_attributes_reply_t *attrib;

	tree_cookie = xcb_query_tree(conn, window);
	attrib_cookie = xcb_get_window_attributes(conn, window);

	tree = xcb_query_tree_reply(conn, tree_cookie, NULL);
	attrib = xcb_get_window_attributes_reply(conn, attrib_cookie, NULL);
	if (attrib == NULL || tree == NULL) {
		free(attrib);
		free(tree);
		return NULL;
	}

	xcb_window_t root = tree->root;
	xcb_visualid_t visual_id = attrib->visual;
	free(attrib);
	free(tree);

	xcb_screen_t *screen = get_screen_for_root(conn, root);
	if (screen == NULL)
		return NULL;

	return screen_get_visualtype(screen, visual_id, depth);
}

static bool
visual_has_alpha(xcb_visualtype_t *visual, unsigned depth)
{
	uint32_t rgb_mask = visual->red_mask |
		visual->green_mask |
		visual->blue_mask;

	uint32_t all_mask = 0xffffffff >> (32 - depth);

	/* Do we have bits left over after RGB? */
	return (all_mask & ~rgb_mask) != 0;
}

VkBool32 radv_GetPhysicalDeviceXcbPresentationSupportKHR(
	VkPhysicalDevice                            physicalDevice,
	uint32_t                                    queueFamilyIndex,
	xcb_connection_t*                           connection,
	xcb_visualid_t                              visual_id)
{
	RADV_FROM_HANDLE(radv_physical_device, device, physicalDevice);

	struct wsi_x11_connection *wsi_conn =
		wsi_x11_get_connection(device, connection);

	if (!wsi_conn->has_dri3) {
		fprintf(stderr, "vulkan: No DRI3 support\n");
		return false;
	}

	unsigned visual_depth;
	if (!connection_get_visualtype(connection, visual_id, &visual_depth))
		return false;

	if (visual_depth != 24 && visual_depth != 32)
		return false;

	return true;
}

VkBool32 radv_GetPhysicalDeviceXlibPresentationSupportKHR(
	VkPhysicalDevice                            physicalDevice,
	uint32_t                                    queueFamilyIndex,
	Display*                                    dpy,
	VisualID                                    visualID)
{
	return radv_GetPhysicalDeviceXcbPresentationSupportKHR(physicalDevice,
							       queueFamilyIndex,
							       XGetXCBConnection(dpy),
							       visualID);
}

static xcb_connection_t*
x11_surface_get_connection(VkIcdSurfaceBase *icd_surface)
{
	if (icd_surface->platform == VK_ICD_WSI_PLATFORM_XLIB)
		return XGetXCBConnection(((VkIcdSurfaceXlib *)icd_surface)->dpy);
	else
		return ((VkIcdSurfaceXcb *)icd_surface)->connection;
}

static xcb_window_t
x11_surface_get_window(VkIcdSurfaceBase *icd_surface)
{
	if (icd_surface->platform == VK_ICD_WSI_PLATFORM_XLIB)
		return ((VkIcdSurfaceXlib *)icd_surface)->window;
	else
		return ((VkIcdSurfaceXcb *)icd_surface)->window;
}

static VkResult
x11_surface_get_support(VkIcdSurfaceBase *icd_surface,
                        struct radv_physical_device *device,
                        uint32_t queueFamilyIndex,
                        VkBool32* pSupported)
{
	xcb_connection_t *conn = x11_surface_get_connection(icd_surface);
	xcb_window_t window = x11_surface_get_window(icd_surface);

	struct wsi_x11_connection *wsi_conn =
		wsi_x11_get_connection(device, conn);
	if (!wsi_conn)
		return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);

	if (!wsi_conn->has_dri3) {
		fprintf(stderr, "vulkan: No DRI3 support\n");
		*pSupported = false;
		return VK_SUCCESS;
	}

	unsigned visual_depth;
	if (!get_visualtype_for_window(conn, window, &visual_depth)) {
		*pSupported = false;
		return VK_SUCCESS;
	}

	if (visual_depth != 24 && visual_depth != 32) {
		*pSupported = false;
		return VK_SUCCESS;
	}

	*pSupported = true;
	return VK_SUCCESS;
}

static VkResult
x11_surface_get_capabilities(VkIcdSurfaceBase *icd_surface,
                             struct radv_physical_device *device,
                             VkSurfaceCapabilitiesKHR *caps)
{
	xcb_connection_t *conn = x11_surface_get_connection(icd_surface);
	xcb_window_t window = x11_surface_get_window(icd_surface);
	xcb_get_geometry_cookie_t geom_cookie;
	xcb_generic_error_t *err;
	xcb_get_geometry_reply_t *geom;
	unsigned visual_depth;

	geom_cookie = xcb_get_geometry(conn, window);

	/* This does a round-trip.  This is why we do get_geometry first and
	 * wait to read the reply until after we have a visual.
	 */
	xcb_visualtype_t *visual =
		get_visualtype_for_window(conn, window, &visual_depth);

	geom = xcb_get_geometry_reply(conn, geom_cookie, &err);
	if (geom) {
		VkExtent2D extent = { geom->width, geom->height };
		caps->currentExtent = extent;
		caps->minImageExtent = extent;
		caps->maxImageExtent = extent;
	} else {
		/* This can happen if the client didn't wait for the configure event
		 * to come back from the compositor.  In that case, we don't know the
		 * size of the window so we just return valid "I don't know" stuff.
		 */
		caps->currentExtent = (VkExtent2D) { -1, -1 };
		caps->minImageExtent = (VkExtent2D) { 1, 1 };
		caps->maxImageExtent = (VkExtent2D) { INT16_MAX, INT16_MAX };
	}
	free(err);
	free(geom);

	if (visual_has_alpha(visual, visual_depth)) {
		caps->supportedCompositeAlpha = VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR |
			VK_COMPOSITE_ALPHA_PRE_MULTIPLIED_BIT_KHR;
	} else {
		caps->supportedCompositeAlpha = VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR |
			VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
	}

	caps->minImageCount = 2;
	caps->maxImageCount = 4;
	caps->supportedTransforms = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
	caps->currentTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
	caps->maxImageArrayLayers = 1;
	caps->supportedUsageFlags =
		VK_IMAGE_USAGE_TRANSFER_SRC_BIT |
		VK_IMAGE_USAGE_SAMPLED_BIT |
		VK_IMAGE_USAGE_TRANSFER_DST_BIT |
		VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;

	return VK_SUCCESS;
}

static VkResult
x11_surface_get_formats(VkIcdSurfaceBase *surface,
                        struct radv_physical_device *device,
                        uint32_t *pSurfaceFormatCount,
                        VkSurfaceFormatKHR *pSurfaceFormats)
{
	if (pSurfaceFormats == NULL) {
		*pSurfaceFormatCount = ARRAY_SIZE(formats);
		return VK_SUCCESS;
	}

	assert(*pSurfaceFormatCount >= ARRAY_SIZE(formats));
	typed_memcpy(pSurfaceFormats, formats, *pSurfaceFormatCount);
	*pSurfaceFormatCount = ARRAY_SIZE(formats);

	return VK_SUCCESS;
}

static VkResult
x11_surface_get_present_modes(VkIcdSurfaceBase *surface,
                              struct radv_physical_device *device,
                              uint32_t *pPresentModeCount,
                              VkPresentModeKHR *pPresentModes)
{
	if (pPresentModes == NULL) {
		*pPresentModeCount = ARRAY_SIZE(present_modes);
		return VK_SUCCESS;
	}

	assert(*pPresentModeCount >= ARRAY_SIZE(present_modes));
	typed_memcpy(pPresentModes, present_modes, *pPresentModeCount);
	*pPresentModeCount = ARRAY_SIZE(present_modes);

	return VK_SUCCESS;
}

static VkResult
x11_surface_create_swapchain(VkIcdSurfaceBase *surface,
                             struct radv_device *device,
                             const VkSwapchainCreateInfoKHR* pCreateInfo,
                             const VkAllocationCallbacks* pAllocator,
                             struct radv_swapchain **swapchain);

VkResult radv_CreateXcbSurfaceKHR(
	VkInstance                                  _instance,
	const VkXcbSurfaceCreateInfoKHR*            pCreateInfo,
	const VkAllocationCallbacks*                pAllocator,
	VkSurfaceKHR*                               pSurface)
{
	RADV_FROM_HANDLE(radv_instance, instance, _instance);

	assert(pCreateInfo->sType == VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR);

	VkIcdSurfaceXcb *surface;

	surface = vk_alloc2(&instance->alloc, pAllocator, sizeof *surface, 8,
			      VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
	if (surface == NULL)
		return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);

	surface->base.platform = VK_ICD_WSI_PLATFORM_XCB;
	surface->connection = pCreateInfo->connection;
	surface->window = pCreateInfo->window;

	*pSurface = _VkIcdSurfaceBase_to_handle(&surface->base);

	return VK_SUCCESS;
}

VkResult radv_CreateXlibSurfaceKHR(
	VkInstance                                  _instance,
	const VkXlibSurfaceCreateInfoKHR*           pCreateInfo,
	const VkAllocationCallbacks*                pAllocator,
	VkSurfaceKHR*                               pSurface)
{
	RADV_FROM_HANDLE(radv_instance, instance, _instance);

	assert(pCreateInfo->sType == VK_STRUCTURE_TYPE_XLIB_SURFACE_CREATE_INFO_KHR);

	VkIcdSurfaceXlib *surface;

	surface = vk_alloc2(&instance->alloc, pAllocator, sizeof *surface, 8,
			      VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
	if (surface == NULL)
		return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);

	surface->base.platform = VK_ICD_WSI_PLATFORM_XLIB;
	surface->dpy = pCreateInfo->dpy;
	surface->window = pCreateInfo->window;

	*pSurface = _VkIcdSurfaceBase_to_handle(&surface->base);

	return VK_SUCCESS;
}

struct x11_image {
	struct radv_image *                        image;
	struct radv_device_memory *                memory;
	xcb_pixmap_t                              pixmap;
	bool                                      busy;
	struct xshmfence *                        shm_fence;
	uint32_t                                  sync_fence;
};

struct x11_swapchain {
	struct radv_swapchain                        base;

	xcb_connection_t *                           conn;
	xcb_window_t                                 window;
	xcb_gc_t                                     gc;
	VkExtent2D                                   extent;
	uint32_t                                     image_count;

	xcb_present_event_t                          event_id;
	xcb_special_event_t *                        special_event;
	uint64_t                                     send_sbc;
	uint32_t                                     stamp;

	struct x11_image                             images[0];
};

static VkResult
x11_get_images(struct radv_swapchain *radv_chain,
               uint32_t* pCount, VkImage *pSwapchainImages)
{
	struct x11_swapchain *chain = (struct x11_swapchain *)radv_chain;

	if (pSwapchainImages == NULL) {
		*pCount = chain->image_count;
		return VK_SUCCESS;
	}

	assert(chain->image_count <= *pCount);
	for (uint32_t i = 0; i < chain->image_count; i++)
		pSwapchainImages[i] = radv_image_to_handle(chain->images[i].image);

	*pCount = chain->image_count;

	return VK_SUCCESS;
}

static VkResult
x11_handle_dri3_present_event(struct x11_swapchain *chain,
                              xcb_present_generic_event_t *event)
{
	switch (event->evtype) {
	case XCB_PRESENT_CONFIGURE_NOTIFY: {
		xcb_present_configure_notify_event_t *config = (void *) event;

		if (config->width != chain->extent.width ||
		    config->height != chain->extent.height)
			return vk_error(VK_ERROR_OUT_OF_DATE_KHR);

		break;
	}

	case XCB_PRESENT_EVENT_IDLE_NOTIFY: {
		xcb_present_idle_notify_event_t *idle = (void *) event;

		for (unsigned i = 0; i < chain->image_count; i++) {
			if (chain->images[i].pixmap == idle->pixmap) {
				chain->images[i].busy = false;
				break;
			}
		}

		break;
	}

	case XCB_PRESENT_COMPLETE_NOTIFY:
	default:
		break;
	}

	return VK_SUCCESS;
}

static VkResult
x11_acquire_next_image(struct radv_swapchain *radv_chain,
                       uint64_t timeout,
                       VkSemaphore semaphore,
                       uint32_t *image_index)
{
	struct x11_swapchain *chain = (struct x11_swapchain *)radv_chain;

	while (1) {
		for (uint32_t i = 0; i < chain->image_count; i++) {
			if (!chain->images[i].busy) {
				/* We found a non-busy image */
				xshmfence_await(chain->images[i].shm_fence);
				*image_index = i;
				chain->images[i].busy = true;
				return VK_SUCCESS;
			}
		}

		xcb_flush(chain->conn);
		xcb_generic_event_t *event =
			xcb_wait_for_special_event(chain->conn, chain->special_event);
		if (!event)
			return vk_error(VK_ERROR_OUT_OF_DATE_KHR);

		VkResult result = x11_handle_dri3_present_event(chain, (void *)event);
		free(event);
		if (result != VK_SUCCESS)
			return result;
	}
}

static VkResult
x11_queue_present(struct radv_swapchain *radv_chain,
                  uint32_t image_index)
{
	struct x11_swapchain *chain = (struct x11_swapchain *)radv_chain;
	struct x11_image *image = &chain->images[image_index];

	assert(image_index < chain->image_count);

	uint32_t options = XCB_PRESENT_OPTION_NONE;

	int64_t target_msc = 0;
	int64_t divisor = 0;
	int64_t remainder = 0;

	options |= XCB_PRESENT_OPTION_ASYNC;

	xshmfence_reset(image->shm_fence);

	++chain->send_sbc;
	xcb_void_cookie_t cookie =
		xcb_present_pixmap(chain->conn,
				   chain->window,
				   image->pixmap,
				   (uint32_t) chain->send_sbc,
				   0,                                    /* valid */
				   0,                                    /* update */
				   0,                                    /* x_off */
				   0,                                    /* y_off */
				   XCB_NONE,                             /* target_crtc */
				   XCB_NONE,
				   image->sync_fence,
				   options,
				   target_msc,
				   divisor,
				   remainder, 0, NULL);
	xcb_discard_reply(chain->conn, cookie.sequence);
	image->busy = true;

	xcb_flush(chain->conn);

	return VK_SUCCESS;
}

static VkResult
x11_image_init(struct radv_device *device, struct x11_swapchain *chain,
               const VkSwapchainCreateInfoKHR *pCreateInfo,
               const VkAllocationCallbacks* pAllocator,
               struct x11_image *image)
{
	xcb_void_cookie_t cookie;
	VkResult result = VK_SUCCESS;
	int fd;
	VkImage image_h;
	bool bret;
	struct radeon_surf *surface;
	result = radv_image_create(radv_device_to_handle(device),
				   &(struct radv_image_create_info) {
					   .vk_info =
						   &(VkImageCreateInfo) {
						   .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
						   .imageType = VK_IMAGE_TYPE_2D,
						   .format = pCreateInfo->imageFormat,
						   .extent = {
							   .width = pCreateInfo->imageExtent.width,
							   .height = pCreateInfo->imageExtent.height,
							   .depth = 1
						   },
						   .mipLevels = 1,
						   .arrayLayers = 1,
						   .samples = 1,
						   /* FIXME: Need a way to use X tiling to allow scanout */
						   .tiling = VK_IMAGE_TILING_OPTIMAL,
						   .usage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
						   .flags = 0,
					   },
						   .scanout = true},
				   NULL,
				   &image_h);
	if (result != VK_SUCCESS)
		return result;

	image->image = radv_image_from_handle(image_h);

	VkDeviceMemory memory_h;
	result = radv_AllocateMemory(radv_device_to_handle(device),
				     &(VkMemoryAllocateInfo) {
					     .sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
						     .allocationSize = image->image->size,
						     .memoryTypeIndex = 0,
						     },
				     NULL /* XXX: pAllocator */,
				     &memory_h);
	if (result != VK_SUCCESS)
		goto fail_create_image;

	image->memory = radv_device_memory_from_handle(memory_h);
	//   image->memory->bo.is_winsys_bo = true;

	radv_BindImageMemory(VK_NULL_HANDLE, image_h, memory_h, 0);

	bret = device->ws->buffer_get_fd(device->ws,
					 image->memory->bo, &fd);
	if (bret == false)
		goto fail_alloc_memory;

	{
		struct radeon_bo_metadata metadata;
		radv_init_metadata(device, image->image, &metadata);
		device->ws->buffer_set_metadata(image->memory->bo, &metadata);
	}
	surface = &image->image->surface;
	uint32_t bpp = 32;
	uint32_t depth = 24;
	image->pixmap = xcb_generate_id(chain->conn);

	cookie =
		xcb_dri3_pixmap_from_buffer_checked(chain->conn,
						    image->pixmap,
						    chain->window,
						    image->image->size,
						    pCreateInfo->imageExtent.width,
						    pCreateInfo->imageExtent.height,
						    surface->level[0].pitch_bytes,
						    depth, bpp, fd);
	xcb_discard_reply(chain->conn, cookie.sequence);

	int fence_fd = xshmfence_alloc_shm();
	if (fence_fd < 0)
		goto fail_pixmap;

	image->shm_fence = xshmfence_map_shm(fence_fd);
	if (image->shm_fence == NULL)
		goto fail_shmfence_alloc;

	image->sync_fence = xcb_generate_id(chain->conn);
	xcb_dri3_fence_from_fd(chain->conn,
			       image->pixmap,
			       image->sync_fence,
			       false,
			       fence_fd);

	image->busy = false;
	xshmfence_trigger(image->shm_fence);

	return VK_SUCCESS;

fail_shmfence_alloc:
	close(fence_fd);

fail_pixmap:
	cookie = xcb_free_pixmap(chain->conn, image->pixmap);
	xcb_discard_reply(chain->conn, cookie.sequence);

fail_alloc_memory:
	radv_FreeMemory(radv_device_to_handle(chain->base.device),
			radv_device_memory_to_handle(image->memory), pAllocator);

fail_create_image:
	radv_DestroyImage(radv_device_to_handle(chain->base.device),
			  radv_image_to_handle(image->image), pAllocator);

	return result;
}

static void
x11_image_finish(struct x11_swapchain *chain,
                 const VkAllocationCallbacks* pAllocator,
                 struct x11_image *image)
{
	xcb_void_cookie_t cookie;

	cookie = xcb_sync_destroy_fence(chain->conn, image->sync_fence);
	xcb_discard_reply(chain->conn, cookie.sequence);
	xshmfence_unmap_shm(image->shm_fence);

	cookie = xcb_free_pixmap(chain->conn, image->pixmap);
	xcb_discard_reply(chain->conn, cookie.sequence);

	radv_DestroyImage(radv_device_to_handle(chain->base.device),
			  radv_image_to_handle(image->image), pAllocator);

	radv_FreeMemory(radv_device_to_handle(chain->base.device),
			radv_device_memory_to_handle(image->memory), pAllocator);

}

static VkResult
x11_swapchain_destroy(struct radv_swapchain *radv_chain,
                      const VkAllocationCallbacks *pAllocator)
{
	struct x11_swapchain *chain = (struct x11_swapchain *)radv_chain;

	for (uint32_t i = 0; i < chain->image_count; i++)
		x11_image_finish(chain, pAllocator, &chain->images[i]);

	xcb_unregister_for_special_event(chain->conn, chain->special_event);

	vk_free2(&chain->base.device->alloc, pAllocator, chain);

	return VK_SUCCESS;
}

static VkResult
x11_surface_create_swapchain(VkIcdSurfaceBase *icd_surface,
                             struct radv_device *device,
                             const VkSwapchainCreateInfoKHR *pCreateInfo,
                             const VkAllocationCallbacks* pAllocator,
                             struct radv_swapchain **swapchain_out)
{
	struct x11_swapchain *chain;
	xcb_void_cookie_t cookie;
	VkResult result;

	assert(pCreateInfo->sType == VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR);

	int num_images = pCreateInfo->minImageCount;

	/* For true mailbox mode, we need at least 4 images:
	 *  1) One to scan out from
	 *  2) One to have queued for scan-out
	 *  3) One to be currently held by the Wayland compositor
	 *  4) One to render to
	 */
	if (pCreateInfo->presentMode == VK_PRESENT_MODE_MAILBOX_KHR)
		num_images = MAX2(num_images, 4);

	size_t size = sizeof(*chain) + num_images * sizeof(chain->images[0]);
	chain = vk_alloc2(&device->alloc, pAllocator, size, 8,
			    VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
	if (chain == NULL)
		return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);

	chain->base.device = device;
	chain->base.destroy = x11_swapchain_destroy;
	chain->base.get_images = x11_get_images;
	chain->base.acquire_next_image = x11_acquire_next_image;
	chain->base.queue_present = x11_queue_present;

	chain->conn = x11_surface_get_connection(icd_surface);
	chain->window = x11_surface_get_window(icd_surface);
	chain->extent = pCreateInfo->imageExtent;
	chain->image_count = num_images;

	chain->send_sbc = 0;
	chain->event_id = xcb_generate_id(chain->conn);
	xcb_present_select_input(chain->conn, chain->event_id, chain->window,
				 XCB_PRESENT_EVENT_MASK_CONFIGURE_NOTIFY |
				 XCB_PRESENT_EVENT_MASK_COMPLETE_NOTIFY |
				 XCB_PRESENT_EVENT_MASK_IDLE_NOTIFY);

	/* Create an XCB event queue to hold present events outside of the usual
	 * application event queue
	 */
	chain->special_event =
		xcb_register_for_special_xge(chain->conn, &xcb_present_id,
					     chain->event_id, NULL);

	chain->gc = xcb_generate_id(chain->conn);
	if (!chain->gc) {
		/* FINISHME: Choose a better error. */
		result = vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
		goto fail_register;
	}

	cookie = xcb_create_gc(chain->conn,
			       chain->gc,
			       chain->window,
			       XCB_GC_GRAPHICS_EXPOSURES,
			       (uint32_t []) { 0 });
	xcb_discard_reply(chain->conn, cookie.sequence);

	uint32_t image = 0;
	for (; image < chain->image_count; image++) {
		result = x11_image_init(device, chain, pCreateInfo, pAllocator,
					&chain->images[image]);
		if (result != VK_SUCCESS)
			goto fail_init_images;
	}

	*swapchain_out = &chain->base;

	return VK_SUCCESS;

fail_init_images:
	for (uint32_t j = 0; j < image; j++)
		x11_image_finish(chain, pAllocator, &chain->images[j]);

fail_register:
	xcb_unregister_for_special_event(chain->conn, chain->special_event);

	vk_free2(&device->alloc, pAllocator, chain);

	return result;
}

VkResult
radv_x11_init_wsi(struct radv_physical_device *device)
{
	struct wsi_x11 *wsi;
	VkResult result;

	wsi = vk_alloc(&device->instance->alloc, sizeof(*wsi), 8,
			 VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);
	if (!wsi) {
		result = vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
		goto fail;
	}

	int ret = pthread_mutex_init(&wsi->mutex, NULL);
	if (ret != 0) {
		if (ret == ENOMEM) {
			result = vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
		} else {
			/* FINISHME: Choose a better error. */
			result = vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
		}

		goto fail_alloc;
	}

	wsi->connections = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
						   _mesa_key_pointer_equal);
	if (!wsi->connections) {
		result = vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
		goto fail_mutex;
	}

	wsi->base.get_support = x11_surface_get_support;
	wsi->base.get_capabilities = x11_surface_get_capabilities;
	wsi->base.get_formats = x11_surface_get_formats;
	wsi->base.get_present_modes = x11_surface_get_present_modes;
	wsi->base.create_swapchain = x11_surface_create_swapchain;

	device->wsi[VK_ICD_WSI_PLATFORM_XCB] = &wsi->base;
	device->wsi[VK_ICD_WSI_PLATFORM_XLIB] = &wsi->base;

	return VK_SUCCESS;

fail_mutex:
	pthread_mutex_destroy(&wsi->mutex);
fail_alloc:
	vk_free(&device->instance->alloc, wsi);
fail:
	device->wsi[VK_ICD_WSI_PLATFORM_XCB] = NULL;
	device->wsi[VK_ICD_WSI_PLATFORM_XLIB] = NULL;

	return result;
}

void
radv_x11_finish_wsi(struct radv_physical_device *device)
{
	struct wsi_x11 *wsi =
		(struct wsi_x11 *)device->wsi[VK_ICD_WSI_PLATFORM_XCB];

	if (wsi) {
		_mesa_hash_table_destroy(wsi->connections, NULL);

		pthread_mutex_destroy(&wsi->mutex);

		vk_free(&device->instance->alloc, wsi);
	}
}