gltexture: Optionally take a sync object

Add a new function to TextureBuilder that takes a GLsync that
requires internal code to wait on before using the texture.

Somewhat sneakily, we don't take the sync if syncs are not supported by
the current GL context.
As public API has no code to query the sync for the destroy notify, this
is fine and it means we don't have to do the check every time we want to
call gdk_texture_get_sync() internally.

gdk/gdkgltexture.c

@@ -39,6 +39,7 @@ struct _GdkGLTexture {
   GdkGLContext *context;
   guint id;
   gboolean has_mipmap;
+  gpointer sync;
 
   GdkTexture *saved;
 
@@ -296,6 +297,12 @@ gdk_gl_texture_has_mipmap (GdkGLTexture *self)
   return self->has_mipmap;
 }
 
+gpointer
+gdk_gl_texture_get_sync (GdkGLTexture *self)
+{
+  return self->sync;
+}
+
 /**
  * gdk_gl_texture_release:
  * @self: a `GdkTexture` wrapping a GL texture
@@ -337,6 +344,8 @@ gdk_gl_texture_new_from_builder (GdkGLTextureBuilder *builder,
   self->id = gdk_gl_texture_builder_get_id (builder);
   GDK_TEXTURE (self)->format = gdk_gl_texture_builder_get_format (builder);
   self->has_mipmap = gdk_gl_texture_builder_get_has_mipmap (builder);
+  if (gdk_gl_context_has_sync (self->context))
+    self->sync = gdk_gl_texture_builder_get_sync (builder);
   self->destroy = destroy;
   self->data = data;
 

gdk/gdkgltexturebuilder.c

@@ -35,6 +35,7 @@ struct _GdkGLTextureBuilder
   int height;
   GdkMemoryFormat format;
   gboolean has_mipmap;
+  gpointer sync;
 };
 
 struct _GdkGLTextureBuilderClass
@@ -68,6 +69,7 @@ enum
   PROP_HAS_MIPMAP,
   PROP_HEIGHT,
   PROP_ID,
+  PROP_SYNC,
   PROP_WIDTH,
 
   N_PROPS
@@ -117,6 +119,10 @@ gdk_gl_texture_builder_get_property (GObject    *object,
       g_value_set_uint (value, self->id);
       break;
 
+    case PROP_SYNC:
+      g_value_set_pointer (value, self->sync);
+      break;
+
     case PROP_WIDTH:
       g_value_set_int (value, self->width);
       break;
@@ -157,6 +163,10 @@ gdk_gl_texture_builder_set_property (GObject      *object,
       gdk_gl_texture_builder_set_id (self, g_value_get_uint (value));
       break;
 
+    case PROP_SYNC:
+      gdk_gl_texture_builder_set_sync (self, g_value_get_pointer (value));
+      break;
+
     case PROP_WIDTH:
       gdk_gl_texture_builder_set_width (self, g_value_get_int (value));
       break;
@@ -237,6 +247,19 @@ gdk_gl_texture_builder_class_init (GdkGLTextureBuilderClass *klass)
                        0, G_MAXUINT, 0,
                        G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
 
+  /**
+   * GdkGLTextureBuilder:sync: (attributes org.gdk.Property.get=gdk_gl_texture_builder_get_sync org.gdk.Property.set=gdk_gl_texture_builder_set_sync)
+   *
+   * An optional `GLSync` object.
+   *
+   * If this is set, GTK will wait on it before using the texture.
+   *
+   * Since: 4.12
+   */
+  properties[PROP_SYNC] =
+    g_param_spec_pointer ("sync", NULL, NULL,
+                          G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
   /**
    * GdkGLTextureBuilder:width: (attributes org.gdk.Property.get=gdk_gl_texture_builder_get_width org.gdk.Property.set=gdk_gl_texture_builder_set_width)
    *
@@ -494,6 +517,54 @@ gdk_gl_texture_builder_set_has_mipmap (GdkGLTextureBuilder *self,
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_HAS_MIPMAP]);
 }
 
+/**
+ * gdk_gl_texture_builder_get_sync: (attributes org.gdk.Method.get_property=sync)
+ * @self: a `GdkGLTextureBuilder`
+ *
+ * Gets the `GLsync` previously set via gdk_gl_texture_builder_set_sync().
+ *
+ * Returns: (nullable): the `GLSync`
+ *
+ * Since: 4.12
+ */
+gpointer
+gdk_gl_texture_builder_get_sync (GdkGLTextureBuilder *self)
+{
+  g_return_val_if_fail (GDK_IS_GL_TEXTURE_BUILDER (self), NULL);
+
+  return self->sync;
+}
+
+/**
+ * gdk_gl_texture_builder_set_sync: (attributes org.gdk.Method.set_property=sync)
+ * @self: a `GdkGLTextureBuilder`
+ * @sync: (nullable): the GLSync object
+ *
+ * Sets the GLSync object to use for the texture.
+ *
+ * GTK will wait on this object before using the created `GdkTexture`.
+ *
+ * The `destroy` function that is passed to [method@Gdk.GLTextureBuilder.build]
+ * is responsible for freeing the sync object when it is no longer needed.
+ * The texture builder does not destroy it and it is the callers
+ * responsibility to make sure it doesn't leak.
+ *
+ * Since: 4.12
+ */
+void
+gdk_gl_texture_builder_set_sync (GdkGLTextureBuilder *self,
+                                 gpointer             sync)
+{
+  g_return_if_fail (GDK_IS_GL_TEXTURE_BUILDER (self));
+
+  if (self->sync == sync)
+    return;
+
+  self->sync = sync;
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SYNC]);
+}
+
 /**
  * gdk_gl_texture_builder_get_format: (attributes org.gdk.Method.get_property=format)
  * @self: a `GdkGLTextureBuilder`
@@ -553,9 +624,9 @@ gdk_gl_texture_builder_set_format (GdkGLTextureBuilder *self,
  *
  * The `destroy` function gets called when the returned texture gets released;
  * either when the texture is finalized or by an explicit call to
- * [method@Gdk.GLTexture.release].
- * This function should release all GL resources associated with the texture,
- * such as the [property@Gdk.GLTextureBuilder:id].
+ * [method@Gdk.GLTexture.release]. It should release all GL resources associated
+ * with the texture, such as the [property@Gdk.GLTextureBuilder:id] and the
+ * [property@Gdk.GLTextureBuilder:sync].
  *
  * Note that it is a programming error to call this function if any mandatory
  * property has not been set.

gdk/gdkgltexturebuilder.h

@@ -72,6 +72,12 @@ GDK_AVAILABLE_IN_4_12
 void                    gdk_gl_texture_builder_set_has_mipmap   (GdkGLTextureBuilder    *self,
                                                                  gboolean                has_mipmap);
 
+GDK_AVAILABLE_IN_4_12
+gpointer                gdk_gl_texture_builder_get_sync         (GdkGLTextureBuilder    *self) G_GNUC_PURE;
+GDK_AVAILABLE_IN_4_12
+void                    gdk_gl_texture_builder_set_sync         (GdkGLTextureBuilder    *self,
+                                                                 gpointer                sync);
+
 GDK_AVAILABLE_IN_4_12
 GdkTexture *            gdk_gl_texture_builder_build            (GdkGLTextureBuilder    *self,
                                                                  GDestroyNotify          destroy,

gdk/gdkgltextureprivate.h

@@ -15,6 +15,7 @@ GdkTexture *            gdk_gl_texture_new_from_builder (GdkGLTextureBuilder
 GdkGLContext *          gdk_gl_texture_get_context      (GdkGLTexture           *self);
 guint                   gdk_gl_texture_get_id           (GdkGLTexture           *self);
 gboolean                gdk_gl_texture_has_mipmap       (GdkGLTexture           *self);
+gpointer                gdk_gl_texture_get_sync         (GdkGLTexture           *self);
 
 G_END_DECLS