[metacity] vulkan: create semaphore

[Alberts Muktupāvels <muktupavels src gnome org>]

commit e15af3113b2ee4645bfbf3b57a8d2458c7752272
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Mar 16 17:29:32 2017 +0200

    vulkan: create semaphore

 src/compositor/meta-compositor-vulkan.c |   35 +++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)
---
diff --git a/src/compositor/meta-compositor-vulkan.c b/src/compositor/meta-compositor-vulkan.c
index 45d3d30..9ec831a 100644
--- a/src/compositor/meta-compositor-vulkan.c
+++ b/src/compositor/meta-compositor-vulkan.c
@@ -51,6 +51,8 @@ struct _MetaCompositorVulkan
   VkQueue                  present_queue;
 
   VkCommandPool            command_pool;
+
+  VkSemaphore              semaphore;
 #endif
 };
 
@@ -657,6 +659,30 @@ create_command_pool (MetaCompositorVulkan  *vulkan,
 
   return TRUE;
 }
+
+static gboolean
+create_semaphore (MetaCompositorVulkan  *vulkan,
+                  GError               **error)
+{
+  VkSemaphoreCreateInfo info;
+  VkResult result;
+
+  info.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
+  info.pNext = NULL;
+  info.flags = 0;
+
+  result = vkCreateSemaphore (vulkan->device, &info, NULL, &vulkan->semaphore);
+
+  if (result != VK_SUCCESS)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                   "Failed to create semaphore");
+
+      return FALSE;
+    }
+
+  return TRUE;
+}
 #endif
 
 static void
@@ -667,6 +693,12 @@ meta_compositor_vulkan_finalize (GObject *object)
 
   vulkan = META_COMPOSITOR_VULKAN (object);
 
+  if (vulkan->semaphore != VK_NULL_HANDLE)
+    {
+      vkDestroySemaphore (vulkan->device, vulkan->semaphore, NULL);
+      vulkan->semaphore = VK_NULL_HANDLE;
+    }
+
   if (vulkan->command_pool != VK_NULL_HANDLE)
     {
       vkDestroyCommandPool (vulkan->device, vulkan->command_pool, NULL);
@@ -761,6 +793,9 @@ meta_compositor_vulkan_manage (MetaCompositor  *compositor,
   if (!create_command_pool (vulkan, error))
     return FALSE;
 
+  if (!create_semaphore (vulkan, error))
+    return FALSE;
+
   g_timeout_add (10000, (GSourceFunc) not_implemented_cb, vulkan);
 
   return TRUE;