vulkan: add a simple refcountable fence wrapper

ext/vulkan/Makefile.am

@@ -9,6 +9,7 @@ libgstvulkan_la_SOURCES = \
 	vkdevice.c \
 	vkdisplay.c \
 	vkerror.c \
+	vkfence.c \
 	vkbuffermemory.c \
 	vkimagememory.c \
 	vkbufferpool.c \
@@ -31,6 +32,7 @@ noinst_HEADERS = \
 	vkdevice.h \
 	vkdisplay.h \
 	vkerror.h \
+	vkfence.h \
 	vkimagememory.h \
 	vkinstance.h \
 	vkmacros.h \

ext/vulkan/vk.h

@@ -29,6 +29,7 @@
 #include "vkinstance.h"
 #include "vkdevice.h"
 #include "vkqueue.h"
+#include "vkfence.h"
 #include "vkdisplay.h"
 #include "vkwindow.h"
 #include "vkswapper.h"

ext/vulkan/vk_fwd.h

@@ -50,6 +50,8 @@ typedef struct _GstVulkanSwapper GstVulkanSwapper;
 typedef struct _GstVulkanSwapperClass GstVulkanSwapperClass;
 typedef struct _GstVulkanSwapperPrivate GstVulkanSwapperPrivate;
 
+typedef struct _GstVulkanFence GstVulkanFence;
+
 typedef struct _GstVulkanMemory GstVulkanMemory;
 typedef struct _GstVulkanMemoryAllocator GstVulkanMemoryAllocator;
 typedef struct _GstVulkanMemoryAllocatorClass GstVulkanMemoryAllocatorClass;

ext/vulkan/vkfence.c

@@ -0,0 +1,98 @@
+/*
+ * GStreamer
+ * Copyright (C) 2016 Matthew Waters <matthew@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "vkfence.h"
+#include "vkutils_private.h"
+
+GST_DEBUG_CATEGORY (gst_debug_vulkan_fence);
+#define GST_CAT_DEFAULT gst_debug_vulkan_fence
+
+static void
+_init_debug (void)
+{
+  static volatile gsize init;
+
+  if (g_once_init_enter (&init)) {
+    GST_DEBUG_CATEGORY_INIT (gst_debug_vulkan_fence,
+        "vulkanfence", 0, "Vulkan Fence");
+    g_once_init_leave (&init, 1);
+  }
+}
+
+static void
+gst_vulkan_fence_free (GstVulkanFence * fence)
+{
+  if (!fence)
+    return;
+
+  GST_TRACE ("Freeing fence %p", fence);
+
+  vkDestroyFence (fence->device->device, fence->fence, NULL);
+
+  gst_object_unref (fence->device);
+
+  g_free (fence);
+}
+
+GstVulkanFence *
+gst_vulkan_fence_new (GstVulkanDevice * device, VkFenceCreateFlags flags,
+    GError ** error)
+{
+  VkFenceCreateInfo fence_info = { 0, };
+  GstVulkanFence *fence;
+  VkResult err;
+
+  _init_debug ();
+
+  g_return_val_if_fail (GST_IS_VULKAN_DEVICE (device), FALSE);
+
+  fence = g_new0 (GstVulkanFence, 1);
+  GST_TRACE ("Creating fence %p with device %" GST_PTR_FORMAT, fence, device);
+  fence->device = gst_object_ref (device);
+
+  fence_info.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
+  fence_info.pNext = NULL;
+  fence_info.flags = flags;
+
+  err = vkCreateFence (device->device, &fence_info, NULL, &fence->fence);
+  if (gst_vulkan_error_to_g_error (err, error, "vkCreateFence") < 0) {
+    g_free (fence);
+    return NULL;
+  }
+
+  gst_mini_object_init (GST_MINI_OBJECT_CAST (fence), 0, GST_TYPE_VULKAN_FENCE,
+      NULL, NULL, (GstMiniObjectFreeFunction) gst_vulkan_fence_free);
+
+  return fence;
+}
+
+gboolean
+gst_vulkan_fence_is_signaled (GstVulkanFence * fence)
+{
+  g_return_val_if_fail (fence != NULL, FALSE);
+
+  return vkGetFenceStatus (fence->device->device, fence->fence) == VK_SUCCESS;
+}
+
+GST_DEFINE_MINI_OBJECT_TYPE (GstVulkanFence, gst_vulkan_fence);

ext/vulkan/vkfence.h

@@ -0,0 +1,63 @@
+/*
+ * GStreamer
+ * Copyright (C) 2016 Matthew Waters <matthew@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _VK_FENCE_H_
+#define _VK_FENCE_H_
+
+#include <vk.h>
+
+#define GST_TYPE_VULKAN_FENCE (gst_vulkan_fence_get_type ())
+GType gst_vulkan_fence_get_type (void);
+
+#define GST_VULKAN_FENCE_CAST(f) ((GstVulkanFence *) f)
+#define GST_VULKAN_FENCE_FENCE(f) (GST_VULKAN_FENCE_CAST(f)->fence)
+
+G_BEGIN_DECLS
+
+struct _GstVulkanFence
+{
+  GstMiniObject parent;
+
+  GstVulkanDevice *device;
+
+  VkFence fence;
+};
+
+GstVulkanFence *    gst_vulkan_fence_new            (GstVulkanDevice * device,
+                                                     VkFenceCreateFlags flags,
+                                                     GError ** error);
+GstVulkanFence *    gst_vulkan_fence_wait           (GstVulkanFence * fence);
+gboolean            gst_vulkan_fence_is_signaled    (GstVulkanFence * fence);
+
+static inline GstVulkanFence *
+gst_vulkan_fence_ref (GstVulkanFence * fence)
+{
+  return GST_VULKAN_FENCE_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (fence)));
+}
+
+static inline void
+gst_vulkan_fence_unref (GstVulkanFence * fence)
+{
+  gst_mini_object_unref (GST_MINI_OBJECT_CAST (fence));
+}
+
+G_END_DECLS
+
+#endif /* _VK_FENCE_H_ */