gl: Add some comments

diff --git a/gsk/gl/gskgldriver.c b/gsk/gl/gskgldriver.c
index 321681d507c60a0bf129ea0b02513be301051dc3..02132fc463dd7f0e8fcfd9aebecf6921cc5d4e07 100644 (file)
--- a/gsk/gl/gskgldriver.c
+++ b/gsk/gl/gskgldriver.c
@@ -46,8 +46,8 @@ struct _GskGLDriver
 
   Fbo default_fbo;
 
-  GHashTable *textures;
-  GHashTable *pointer_textures;
+  GHashTable *textures;         /* texture_id -> Texture */
+  GHashTable *pointer_textures; /* pointer -> texture_id */
 
   const Texture *bound_source_texture;