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1 /*
2  * GStreamer
3  * Copyright (C) 2019 Matthew Waters <matthew@centricular.com>
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Library General Public License for more details.
14  *
15  * You should have received a copy of the GNU Library General Public
16  * License along with this library; if not, write to the
17  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18  * Boston, MA 02110-1301, USA.
19  */
20 
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24 
25 #include <gst/vulkan/vulkan.h>
26 
27 /**
28  * SECTION:vkimageview
29  * @title: GstVulkanImageView
30  * @short_description: wrapper for `VkImageView`'s
31  * @see_also: #GstVulkanImageMemory, #GstVulkanDevice
32  *
33  * #GstVulkanImageView is a wrapper around a `VkImageView` mostly for
34  * usage across element boundaries with #GstVulkanImageMemory
35  */
36 
37 #define GST_CAT_DEFUALT GST_CAT_VULKAN_IMAGE_VIEW
38 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFUALT);
39 
40 static void
init_debug(void)41 init_debug (void)
42 {
43   static gsize _init = 0;
44 
45   if (g_once_init_enter (&_init)) {
46     GST_DEBUG_CATEGORY_INIT (GST_CAT_VULKAN_IMAGE_VIEW, "vulkanimageview",
47         0, "Vulkan Image View");
48     g_once_init_leave (&_init, 1);
49   }
50 }
51 
52 extern void
53 gst_vulkan_image_memory_release_view (GstVulkanImageMemory * image,
54     GstVulkanImageView * view);
55 
56 static gboolean
gst_vulkan_image_view_dispose(GstVulkanImageView * view)57 gst_vulkan_image_view_dispose (GstVulkanImageView * view)
58 {
59   GstVulkanImageMemory *image;
60 
61   if ((image = view->image) == NULL)
62     return TRUE;
63 
64   gst_vulkan_image_view_ref (view);
65   gst_vulkan_image_memory_release_view (image, view);
66 
67   return FALSE;
68 }
69 
70 static void
gst_vulkan_image_view_free(GstVulkanImageView * view)71 gst_vulkan_image_view_free (GstVulkanImageView * view)
72 {
73   GST_CAT_TRACE (GST_CAT_VULKAN_IMAGE_VIEW, "freeing image view:%p ", view);
74 
75   if (view->view)
76     vkDestroyImageView (view->device->device, view->view, NULL);
77 
78   if (view->image) {
79     gst_memory_unref (GST_MEMORY_CAST (view->image));
80   }
81   view->image = NULL;
82   gst_clear_object (&view->device);
83 
84   g_free (view);
85 }
86 
87 /**
88  * gst_vulkan_image_view_new:
89  * @image: a #GstVulkanImageMemory to create the new view from
90  * @create_info: the creation information to create the view from
91  *
92  * Returns: (transfer full): A new #GstVulkanImageView from @image and
93  *          @create_info
94  *
95  * Since: 1.18
96  */
97 GstVulkanImageView *
gst_vulkan_image_view_new(GstVulkanImageMemory * image,VkImageViewCreateInfo * create_info)98 gst_vulkan_image_view_new (GstVulkanImageMemory * image,
99     VkImageViewCreateInfo * create_info)
100 {
101   GstVulkanImageView *view;
102   GError *error = NULL;
103   VkResult err;
104 
105   g_return_val_if_fail (create_info != NULL, NULL);
106   g_return_val_if_fail (gst_is_vulkan_image_memory (GST_MEMORY_CAST (image)),
107       NULL);
108 
109   init_debug ();
110 
111   view = g_new0 (GstVulkanImageView, 1);
112 
113   gst_mini_object_init ((GstMiniObject *) view, 0,
114       gst_vulkan_image_view_get_type (), NULL,
115       (GstMiniObjectDisposeFunction) gst_vulkan_image_view_dispose,
116       (GstMiniObjectFreeFunction) gst_vulkan_image_view_free);
117 
118   err =
119       vkCreateImageView (image->device->device, create_info, NULL, &view->view);
120   if (gst_vulkan_error_to_g_error (err, &error, "vkImageCreateView") < 0)
121     goto vk_error;
122 
123   view->image =
124       (GstVulkanImageMemory *) gst_memory_ref (GST_MEMORY_CAST (image));
125   view->device = gst_object_ref (image->device);
126   view->create_info = *create_info;
127   /* we cannot keep this as it may point to stack allocated memory */
128   view->create_info.pNext = NULL;
129 
130   GST_CAT_TRACE (GST_CAT_VULKAN_IMAGE_VIEW, "new image view for image: %p",
131       image);
132 
133   return view;
134 
135 vk_error:
136   {
137     GST_CAT_ERROR (GST_CAT_VULKAN_IMAGE_VIEW,
138         "Failed to allocate image memory %s", error->message);
139     g_clear_error (&error);
140     goto error;
141   }
142 
143 error:
144   {
145     g_free (view);
146     return NULL;
147   }
148 }
149 
150 GST_DEFINE_MINI_OBJECT_TYPE (GstVulkanImageView, gst_vulkan_image_view);
151