[gtk/wip/chergert/glproto] fix texture lifecycle management

[Christian Hergert <chergert src gnome org>]

commit 0acbcd96ef1d7fe65ae190bf30060c08cf6ded82
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jan 28 13:34:33 2021 -0800

    fix texture lifecycle management

 gsk/next/gskgldriver.c        | 22 ++++++++++++++--------
 gsk/next/gskgldriverprivate.h |  2 +-
 gsk/next/gskgltexturepool.c   | 12 ++++++++++++
 3 files changed, 27 insertions(+), 9 deletions(-)
---
diff --git a/gsk/next/gskgldriver.c b/gsk/next/gskgldriver.c
index 231ca3c4f3..a2c707709d 100644
--- a/gsk/next/gskgldriver.c
+++ b/gsk/next/gskgldriver.c
@@ -871,13 +871,17 @@ void
 gsk_next_driver_release_texture (GskNextDriver *self,
                                  GskGLTexture  *texture)
 {
+  guint texture_id;
+
   g_return_if_fail (GSK_IS_NEXT_DRIVER (self));
   g_return_if_fail (texture != NULL);
 
-  g_hash_table_remove (self->textures,
-                       GUINT_TO_POINTER (texture->texture_id));
-  remove_texture_key_for_id (self, texture->texture_id);
+  texture_id = texture->texture_id;
+
+  if (texture_id > 0)
+    remove_texture_key_for_id (self, texture_id);
 
+  g_hash_table_steal (self->textures, GUINT_TO_POINTER (texture_id));
   gsk_gl_texture_pool_put (&self->texture_pool, texture);
 }
 
@@ -1246,17 +1250,19 @@ gsk_next_driver_slice_texture (GskNextDriver      *self,
   t->n_slices = *out_n_slices = n_slices;
 }
 
-void
+GskGLTexture *
 gsk_next_driver_mark_texture_permanent (GskNextDriver *self,
                                         guint          texture_id)
 {
   GskGLTexture *t;
 
-  g_return_if_fail (GSK_IS_NEXT_DRIVER (self));
-  g_return_if_fail (texture_id > 0);
+  g_return_val_if_fail (GSK_IS_NEXT_DRIVER (self), NULL);
+  g_return_val_if_fail (texture_id > 0, NULL);
 
   if ((t = g_hash_table_lookup (self->textures, GUINT_TO_POINTER (texture_id))))
     t->permanent = TRUE;
+
+  return t;
 }
 
 void
@@ -1268,8 +1274,8 @@ gsk_next_driver_release_texture_by_id (GskNextDriver *self,
   g_return_if_fail (GSK_IS_NEXT_DRIVER (self));
   g_return_if_fail (texture_id > 0);
 
+  remove_texture_key_for_id (self, texture_id);
+
   if ((texture = g_hash_table_lookup (self->textures, GUINT_TO_POINTER (texture_id))))
     gsk_next_driver_release_texture (self, texture);
-  else
-    remove_texture_key_for_id (self, texture_id);
 }
diff --git a/gsk/next/gskgldriverprivate.h b/gsk/next/gskgldriverprivate.h
index 12bc7a4fed..c133ac1056 100644
--- a/gsk/next/gskgldriverprivate.h
+++ b/gsk/next/gskgldriverprivate.h
@@ -158,7 +158,7 @@ void               gsk_next_driver_release_texture       (GskNextDriver        *
                                                           GskGLTexture         *texture);
 void               gsk_next_driver_release_texture_by_id (GskNextDriver        *self,
                                                           guint                 texture_id);
-void               gsk_next_driver_mark_texture_permanent(GskNextDriver        *self,
+GskGLTexture      *gsk_next_driver_mark_texture_permanent(GskNextDriver        *self,
                                                           guint                 texture_id);
 void               gsk_next_driver_slice_texture         (GskNextDriver        *self,
                                                           GdkTexture           *texture,
diff --git a/gsk/next/gskgltexturepool.c b/gsk/next/gskgltexturepool.c
index 49bc7c19e4..18654a7a00 100644
--- a/gsk/next/gskgltexturepool.c
+++ b/gsk/next/gskgltexturepool.c
@@ -31,6 +31,11 @@ gsk_gl_texture_free (GskGLTexture *texture)
 {
   if (texture != NULL)
     {
+      g_return_if_fail (texture->width_link.prev == NULL);
+      g_return_if_fail (texture->width_link.next == NULL);
+      g_return_if_fail (texture->height_link.prev == NULL);
+      g_return_if_fail (texture->height_link.next == NULL);
+
       if (texture->user)
         g_clear_pointer (&texture->user, gdk_texture_clear_render_data);
 
@@ -83,6 +88,7 @@ gsk_gl_texture_pool_put (GskGLTexturePool *self,
 
   g_return_if_fail (self != NULL);
   g_return_if_fail (texture != NULL);
+  g_return_if_fail (texture->user == NULL);
   g_return_if_fail (texture->width_link.prev == NULL);
   g_return_if_fail (texture->width_link.next == NULL);
   g_return_if_fail (texture->width_link.data == texture);
@@ -90,6 +96,12 @@ gsk_gl_texture_pool_put (GskGLTexturePool *self,
   g_return_if_fail (texture->height_link.next == NULL);
   g_return_if_fail (texture->height_link.data == texture);
 
+  if (texture->permanent)
+    {
+      gsk_gl_texture_free (texture);
+      return;
+    }
+
   sibling = NULL;
   for (GList *iter = self->by_width.head;
        iter != NULL;