diff --git a/gdk/gdkgltexture.c b/gdk/gdkgltexture.c
index 94d877e8a2..c5e9f4afb8 100644
--- a/gdk/gdkgltexture.c
+++ b/gdk/gdkgltexture.c
@@ -72,11 +72,15 @@ gdk_gl_texture_dispose (GObject *object)
   G_OBJECT_CLASS (gdk_gl_texture_parent_class)->dispose (object);
 }
 
+typedef void (* GLFunc) (GdkGLTexture *self,
+                         gpointer      data,
+                         GdkGLContext *context);
+
 typedef struct _InvokeData
 {
   GdkGLTexture *self;
   volatile int spinlock;
-  GFunc func;
+  GLFunc func;
   gpointer data;
 } InvokeData;
 
@@ -91,7 +95,7 @@ gdk_gl_texture_invoke_callback (gpointer data)
   gdk_gl_context_make_current (context);
   glBindTexture (GL_TEXTURE_2D, invoke->self->id);
 
-  invoke->func (invoke->self, invoke->data);
+  invoke->func (invoke->self, invoke->data, context);
 
   g_atomic_int_set (&invoke->spinlock, 1);
 
@@ -100,7 +104,7 @@ gdk_gl_texture_invoke_callback (gpointer data)
 
 static void
 gdk_gl_texture_run (GdkGLTexture *self,
-                    GFunc         func,
+                    GLFunc        func,
                     gpointer      data)
 {
   InvokeData invoke = { self, 0, func, data };
@@ -145,19 +149,19 @@ gdk_gl_texture_find_format (gboolean         use_es,
 }
 
 static inline void
-gdk_gl_texture_do_download (gpointer texture_,
-                            gpointer download_)
+gdk_gl_texture_do_download (GdkGLTexture *self,
+                            gpointer      download_,
+                            GdkGLContext *context)
 {
+  GdkTexture *texture = GDK_TEXTURE (self);
   gsize expected_stride;
-  GdkGLTexture *self = texture_;
-  GdkTexture *texture = texture_;
   Download *download = download_;
   GLenum gl_internal_format, gl_format, gl_type;
 
   expected_stride = texture->width * gdk_memory_format_bytes_per_pixel (download->format);
 
   if (download->stride == expected_stride &&
-      !gdk_gl_context_get_use_es (self->context) && 
+      !gdk_gl_context_get_use_es (context) &&
       gdk_memory_format_gl_format (download->format, TRUE, &gl_internal_format, &gl_format, &gl_type))
     {
       glGetTexImage (GL_TEXTURE_2D,
@@ -175,11 +179,11 @@ gdk_gl_texture_do_download (gpointer texture_,
       glGenFramebuffers (1, &fbo);
       glBindFramebuffer (GL_FRAMEBUFFER, fbo);
       glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self->id, 0);
-      if (gdk_gl_context_check_version (self->context, 4, 3, 3, 1))
+      if (gdk_gl_context_check_version (context, 4, 3, 3, 1))
         {
           glGetFramebufferParameteriv (GL_FRAMEBUFFER, GL_IMPLEMENTATION_COLOR_READ_FORMAT, &gl_read_format);
           glGetFramebufferParameteriv (GL_FRAMEBUFFER, GL_IMPLEMENTATION_COLOR_READ_TYPE, &gl_read_type);
-          if (!gdk_gl_texture_find_format (gdk_gl_context_get_use_es (self->context), gl_read_format, gl_read_type, &actual_format))
+          if (!gdk_gl_texture_find_format (gdk_gl_context_get_use_es (context), gl_read_format, gl_read_type, &actual_format))
             actual_format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED; /* pray */
         }
       else
@@ -193,7 +197,7 @@ gdk_gl_texture_do_download (gpointer texture_,
           (download->stride == expected_stride))
         {
           glReadPixels (0, 0,
-                        texture->width, texture->height, 
+                        texture->width, texture->height,
                         gl_read_format,
                         gl_read_type,
                         download->data);
@@ -204,7 +208,7 @@ gdk_gl_texture_do_download (gpointer texture_,
           guchar *pixels = g_malloc_n (texture->width * actual_bpp, texture->height);
 
           glReadPixels (0, 0,
-                        texture->width, texture->height, 
+                        texture->width, texture->height,
                         gl_read_format,
                         gl_read_type,
                         pixels);