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[mutter/wip/nielsdg/coglhandle-stepped-approach: 3/3] cogl: Remove COGL_INVALID_HANDLE

commit 0d0286d59ecf618d5fe84e8bb20f6f5bda9d8c5a
Author: Niels De Graef <niels degraef barco com>
Date:   Wed Feb 20 14:53:01 2019 +0100

    cogl: Remove COGL_INVALID_HANDLE
    
    Just use `NULL`, which is the normal C convention
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/451

 clutter/clutter/clutter-backend.c                  |  4 +--
 clutter/clutter/clutter-offscreen-effect.c         |  4 +--
 clutter/clutter/clutter-shader-effect.c            | 30 +++++++++++-----------
 clutter/clutter/deprecated/clutter-cairo-texture.c |  2 +-
 cogl/cogl/cogl-pipeline-state.c                    |  8 +++---
 cogl/cogl/cogl-pipeline-state.h                    |  2 +-
 cogl/cogl/cogl-pipeline.c                          |  8 +++---
 cogl/cogl/cogl-types.h                             |  8 ------
 cogl/cogl/deprecated/cogl-material-compat.h        |  4 +--
 cogl/cogl/deprecated/cogl-program.c                |  7 +++--
 cogl/cogl/deprecated/cogl-shader.c                 |  4 +--
 cogl/cogl/deprecated/cogl-shader.h                 |  4 +--
 cogl/cogl/deprecated/cogl-vertex-buffer.c          | 12 ++++-----
 cogl/tests/conform/test-just-vertex-shader.c       |  4 +--
 .../clutter/interactive/test-cogl-offscreen.c      |  4 +--
 .../clutter/interactive/test-cogl-shader-glsl.c    |  2 +-
 .../clutter/interactive/test-cogl-tex-polygon.c    |  4 +--
 17 files changed, 51 insertions(+), 60 deletions(-)
---
diff --git a/clutter/clutter/clutter-backend.c b/clutter/clutter/clutter-backend.c
index 4652bc7b8..4d3adc953 100644
--- a/clutter/clutter/clutter-backend.c
+++ b/clutter/clutter/clutter-backend.c
@@ -627,7 +627,7 @@ clutter_backend_init (ClutterBackend *self)
   self->units_per_em = -1.0;
   self->units_serial = 1;
 
-  self->dummy_onscreen = COGL_INVALID_HANDLE;
+  self->dummy_onscreen = NULL;
 }
 
 void
@@ -1012,7 +1012,7 @@ _clutter_backend_get_keymap_direction (ClutterBackend *backend)
 void
 _clutter_backend_reset_cogl_framebuffer (ClutterBackend *backend)
 {
-  if (backend->dummy_onscreen == COGL_INVALID_HANDLE)
+  if (backend->dummy_onscreen == NULL)
     {
       GError *internal_error = NULL;
 
diff --git a/clutter/clutter/clutter-offscreen-effect.c b/clutter/clutter/clutter-offscreen-effect.c
index 54f5fbb7e..9e3756765 100644
--- a/clutter/clutter/clutter-offscreen-effect.c
+++ b/clutter/clutter/clutter-offscreen-effect.c
@@ -537,7 +537,7 @@ clutter_offscreen_effect_init (ClutterOffscreenEffect *self)
  * used instead of clutter_offscreen_effect_get_target() when the
  * effect subclass wants to paint using its own material.
  *
- * Return value: (transfer none): a #CoglHandle or %COGL_INVALID_HANDLE. The
+ * Return value: (transfer none): a #CoglHandle or %NULL. The
  *   returned texture is owned by Clutter and it should not be
  *   modified or freed
  *
@@ -602,7 +602,7 @@ clutter_offscreen_effect_paint_target (ClutterOffscreenEffect *effect)
  * Calls the create_texture() virtual function of the @effect
  *
  * Return value: (transfer full): a handle to a Cogl texture, or
- *   %COGL_INVALID_HANDLE. The returned handle has its reference
+ *   %NULL. The returned handle has its reference
  *   count increased.
  *
  * Since: 1.4
diff --git a/clutter/clutter/clutter-shader-effect.c b/clutter/clutter/clutter-shader-effect.c
index 4a36f973d..2d98d1bb6 100644
--- a/clutter/clutter/clutter-shader-effect.c
+++ b/clutter/clutter/clutter-shader-effect.c
@@ -177,18 +177,18 @@ clutter_shader_effect_clear (ClutterShaderEffect *self,
 {
   ClutterShaderEffectPrivate *priv = self->priv;
 
-  if (priv->shader != COGL_INVALID_HANDLE)
+  if (priv->shader != NULL)
     {
       cogl_object_unref (priv->shader);
 
-      priv->shader = COGL_INVALID_HANDLE;
+      priv->shader = NULL;
     }
 
-  if (priv->program != COGL_INVALID_HANDLE)
+  if (priv->program != NULL)
     {
       cogl_object_unref (priv->program);
 
-      priv->program = COGL_INVALID_HANDLE;
+      priv->program = NULL;
     }
 
   if (reset_uniforms && priv->uniforms != NULL)
@@ -208,7 +208,7 @@ clutter_shader_effect_update_uniforms (ClutterShaderEffect *effect)
   gpointer key, value;
   gsize size;
 
-  if (priv->program == COGL_INVALID_HANDLE)
+  if (priv->program == NULL)
     return;
 
   if (priv->uniforms == NULL)
@@ -333,7 +333,7 @@ clutter_shader_effect_create_shader (ClutterShaderEffect *self)
 
     default:
       g_assert_not_reached ();
-      return COGL_INVALID_HANDLE;
+      return NULL;
     }
 }
 
@@ -353,7 +353,7 @@ clutter_shader_effect_try_static_source (ClutterShaderEffect *self)
                                   CLUTTER_TYPE_SHADER_EFFECT,
                                   ClutterShaderEffectClassPrivate);
 
-      if (class_priv->shader == COGL_INVALID_HANDLE)
+      if (class_priv->shader == NULL)
         {
           gchar *source;
 
@@ -389,7 +389,7 @@ clutter_shader_effect_try_static_source (ClutterShaderEffect *self)
 
       priv->shader = cogl_object_ref (class_priv->shader);
 
-      if (class_priv->program != COGL_INVALID_HANDLE)
+      if (class_priv->program != NULL)
         priv->program = cogl_object_ref (class_priv->program);
     }
 }
@@ -404,13 +404,13 @@ clutter_shader_effect_paint_target (ClutterOffscreenEffect *effect)
 
   /* If the source hasn't been set then we'll try to get it from the
      static source instead */
-  if (priv->shader == COGL_INVALID_HANDLE)
+  if (priv->shader == NULL)
     clutter_shader_effect_try_static_source (self);
 
   /* we haven't been prepared or we don't have support for
    * GLSL shaders in Clutter
    */
-  if (priv->program == COGL_INVALID_HANDLE)
+  if (priv->program == NULL)
     goto out;
 
   CLUTTER_NOTE (SHADER, "Applying the shader effect of type '%s'",
@@ -534,7 +534,7 @@ clutter_shader_effect_new (ClutterShaderType shader_type)
  * Retrieves a pointer to the shader's handle
  *
  * Return value: (transfer none): a pointer to the shader's handle,
- *   or %COGL_INVALID_HANDLE
+ *   or %NULL
  *
  * Since: 1.4
  */
@@ -542,7 +542,7 @@ CoglHandle
 clutter_shader_effect_get_shader (ClutterShaderEffect *effect)
 {
   g_return_val_if_fail (CLUTTER_IS_SHADER_EFFECT (effect),
-                        COGL_INVALID_HANDLE);
+                        NULL);
 
   return effect->priv->shader;
 }
@@ -554,7 +554,7 @@ clutter_shader_effect_get_shader (ClutterShaderEffect *effect)
  * Retrieves a pointer to the program's handle
  *
  * Return value: (transfer none): a pointer to the program's handle,
- *   or %COGL_INVALID_HANDLE
+ *   or %NULL
  *
  * Since: 1.4
  */
@@ -562,7 +562,7 @@ CoglHandle
 clutter_shader_effect_get_program (ClutterShaderEffect *effect)
 {
   g_return_val_if_fail (CLUTTER_IS_SHADER_EFFECT (effect),
-                        COGL_INVALID_HANDLE);
+                        NULL);
 
   return effect->priv->program;
 }
@@ -892,7 +892,7 @@ clutter_shader_effect_set_shader_source (ClutterShaderEffect *effect,
 
   priv = effect->priv;
 
-  if (priv->shader != COGL_INVALID_HANDLE)
+  if (priv->shader != NULL)
     return TRUE;
 
   priv->shader = clutter_shader_effect_create_shader (effect);
diff --git a/clutter/clutter/deprecated/clutter-cairo-texture.c 
b/clutter/clutter/deprecated/clutter-cairo-texture.c
index 8d67af038..f8e513728 100644
--- a/clutter/clutter/deprecated/clutter-cairo-texture.c
+++ b/clutter/clutter/deprecated/clutter-cairo-texture.c
@@ -294,7 +294,7 @@ clutter_cairo_texture_context_destroy (void *data)
   cogl_texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (cairo));
   if (cairo_width == 0 ||
       cairo_height == 0 ||
-      cogl_texture == COGL_INVALID_HANDLE)
+      cogl_texture == NULL)
     {
       draw_context_destroy (ctxt);
       return;
diff --git a/cogl/cogl/cogl-pipeline-state.c b/cogl/cogl/cogl-pipeline-state.c
index 58281f97f..585710ee5 100644
--- a/cogl/cogl/cogl-pipeline-state.c
+++ b/cogl/cogl/cogl-pipeline-state.c
@@ -1070,7 +1070,7 @@ cogl_pipeline_get_user_program (CoglPipeline *pipeline)
 {
   CoglPipeline *authority;
 
-  g_return_val_if_fail (cogl_is_pipeline (pipeline), COGL_INVALID_HANDLE);
+  g_return_val_if_fail (cogl_is_pipeline (pipeline), NULL);
 
   authority =
     _cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_USER_SHADER);
@@ -1105,7 +1105,7 @@ cogl_pipeline_set_user_program (CoglPipeline *pipeline,
    */
   _cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
 
-  if (program != COGL_INVALID_HANDLE)
+  if (program != NULL)
     _cogl_pipeline_set_progend (pipeline, COGL_PIPELINE_PROGEND_UNDEFINED);
 
   /* If we are the current authority see if we can revert to one of our
@@ -1130,10 +1130,10 @@ cogl_pipeline_set_user_program (CoglPipeline *pipeline,
       _cogl_pipeline_prune_redundant_ancestry (pipeline);
     }
 
-  if (program != COGL_INVALID_HANDLE)
+  if (program != NULL)
     cogl_object_ref (program);
   if (authority == pipeline &&
-      pipeline->big_state->user_program != COGL_INVALID_HANDLE)
+      pipeline->big_state->user_program != NULL)
     cogl_object_unref (pipeline->big_state->user_program);
   pipeline->big_state->user_program = program;
 
diff --git a/cogl/cogl/cogl-pipeline-state.h b/cogl/cogl/cogl-pipeline-state.h
index 6e45da3cf..5fe82d0f2 100644
--- a/cogl/cogl/cogl-pipeline-state.h
+++ b/cogl/cogl/cogl-pipeline-state.h
@@ -578,7 +578,7 @@ cogl_pipeline_get_per_vertex_point_size (CoglPipeline *pipeline);
  * Queries what user program has been associated with the given
  * @pipeline using cogl_pipeline_set_user_program().
  *
- * Return value: (transfer none): The current user program or %COGL_INVALID_HANDLE.
+ * Return value: (transfer none): The current user program or %NULL.
  *
  * Since: 2.0
  * Stability: Unstable
diff --git a/cogl/cogl/cogl-pipeline.c b/cogl/cogl/cogl-pipeline.c
index efd7d5222..0f98641ed 100644
--- a/cogl/cogl/cogl-pipeline.c
+++ b/cogl/cogl/cogl-pipeline.c
@@ -182,7 +182,7 @@ _cogl_pipeline_init_default_pipeline (void)
   blend_state->blend_src_factor_rgb = GL_ONE;
   blend_state->blend_dst_factor_rgb = GL_ONE_MINUS_SRC_ALPHA;
 
-  big_state->user_program = COGL_INVALID_HANDLE;
+  big_state->user_program = NULL;
 
   cogl_depth_state_init (&big_state->depth_state);
 
@@ -749,7 +749,7 @@ _cogl_pipeline_change_implies_transparency (CoglPipeline *pipeline,
        *
        * TODO: check that it isn't just a vertex shader!
        */
-      if (_cogl_pipeline_get_user_program (pipeline) != COGL_INVALID_HANDLE)
+      if (_cogl_pipeline_get_user_program (pipeline) != NULL)
         return TRUE;
     }
 
@@ -992,7 +992,7 @@ _cogl_pipeline_copy_differences (CoglPipeline *dest,
         big_state->user_program =
           cogl_object_ref (src->big_state->user_program);
       else
-        big_state->user_program = COGL_INVALID_HANDLE;
+        big_state->user_program = NULL;
     }
 
   if (differences & COGL_PIPELINE_STATE_DEPTH)
@@ -2558,7 +2558,7 @@ _cogl_pipeline_apply_legacy_state (CoglPipeline *pipeline)
   /* A program explicitly set on the pipeline has higher precedence than
    * one associated with the context using cogl_program_use() */
   if (ctx->current_program &&
-      cogl_pipeline_get_user_program (pipeline) == COGL_INVALID_HANDLE)
+      cogl_pipeline_get_user_program (pipeline) == NULL)
     cogl_pipeline_set_user_program (pipeline, ctx->current_program);
 
   if (ctx->legacy_depth_test_enabled)
diff --git a/cogl/cogl/cogl-types.h b/cogl/cogl/cogl-types.h
index 67b07ab01..da30242cc 100644
--- a/cogl/cogl/cogl-types.h
+++ b/cogl/cogl/cogl-types.h
@@ -80,14 +80,6 @@ typedef struct { \
  */
 typedef void * CoglHandle;
 
-/**
- * COGL_INVALID_HANDLE:
- *
- * A COGL handle that is not valid, used for unitialized handles as well as
- * error conditions.
- */
-#define COGL_INVALID_HANDLE NULL
-
 #define COGL_TYPE_HANDLE        (cogl_handle_get_type ())
 GType
 cogl_handle_get_type (void) G_GNUC_CONST;
diff --git a/cogl/cogl/deprecated/cogl-material-compat.h b/cogl/cogl/deprecated/cogl-material-compat.h
index 96d451d5c..b08676858 100644
--- a/cogl/cogl/deprecated/cogl-material-compat.h
+++ b/cogl/cogl/deprecated/cogl-material-compat.h
@@ -706,7 +706,7 @@ cogl_material_get_point_size (CoglMaterial *material);
  * @material using cogl_material_set_user_program().
  *
  * Return value: (transfer none): The current user program
- *   or %COGL_INVALID_HANDLE.
+ *   or %NULL.
  *
  * Since: 1.4
  * Deprecated: 1.16: Use #CoglSnippet api instead instead
@@ -1021,7 +1021,7 @@ cogl_material_layer_get_type (CoglMaterialLayer *layer);
  * Extracts a texture handle for a specific layer.
  *
  * <note>In the future Cogl may support purely GLSL based layers; for those
- * layers this function which will likely return %COGL_INVALID_HANDLE if you
+ * layers this function which will likely return %NULL if you
  * try to get the texture handle from them. Considering this scenario, you
  * should call cogl_material_layer_get_type() first in order check it is of
  * type %COGL_MATERIAL_LAYER_TYPE_TEXTURE before calling this function.</note>
diff --git a/cogl/cogl/deprecated/cogl-program.c b/cogl/cogl/deprecated/cogl-program.c
index ed07af7d9..f68bc3a49 100644
--- a/cogl/cogl/deprecated/cogl-program.c
+++ b/cogl/cogl/deprecated/cogl-program.c
@@ -131,17 +131,16 @@ cogl_program_use (CoglHandle handle)
 {
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
 
-  g_return_if_fail (handle == COGL_INVALID_HANDLE ||
-                    cogl_is_program (handle));
+  g_return_if_fail (handle == NULL || cogl_is_program (handle));
 
   if (ctx->current_program == 0 && handle != 0)
     ctx->legacy_state_set++;
   else if (handle == 0 && ctx->current_program != 0)
     ctx->legacy_state_set--;
 
-  if (handle != COGL_INVALID_HANDLE)
+  if (handle != NULL)
     cogl_object_ref (handle);
-  if (ctx->current_program != COGL_INVALID_HANDLE)
+  if (ctx->current_program != NULL)
     cogl_object_unref (ctx->current_program);
   ctx->current_program = handle;
 }
diff --git a/cogl/cogl/deprecated/cogl-shader.c b/cogl/cogl/deprecated/cogl-shader.c
index c7e17e1f8..7f105f4ef 100644
--- a/cogl/cogl/deprecated/cogl-shader.c
+++ b/cogl/cogl/deprecated/cogl-shader.c
@@ -71,7 +71,7 @@ cogl_create_shader (CoglShaderType type)
 {
   CoglShader *shader;
 
-  _COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
+  _COGL_GET_CONTEXT (ctx, NULL);
 
   switch (type)
     {
@@ -81,7 +81,7 @@ cogl_create_shader (CoglShaderType type)
     default:
       g_warning ("Unexpected shader type (0x%08lX) given to "
                  "cogl_create_shader", (unsigned long) type);
-      return COGL_INVALID_HANDLE;
+      return NULL;
     }
 
   shader = g_slice_new (CoglShader);
diff --git a/cogl/cogl/deprecated/cogl-shader.h b/cogl/cogl/deprecated/cogl-shader.h
index 88acc181f..2b4167ee0 100644
--- a/cogl/cogl/deprecated/cogl-shader.h
+++ b/cogl/cogl/deprecated/cogl-shader.h
@@ -453,10 +453,10 @@ cogl_program_link (CoglHandle handle);
 
 /**
  * cogl_program_use:
- * @handle: a #CoglHandle for a shader program or %COGL_INVALID_HANDLE.
+ * @handle: a #CoglHandle for a shader program or %NULL.
  *
  * Activate a specific shader program replacing that part of the GL
- * rendering pipeline, if passed in %COGL_INVALID_HANDLE the default
+ * rendering pipeline, if passed in %NULL the default
  * behavior of GL is reinstated.
  *
  * This function affects the global state of the current Cogl
diff --git a/cogl/cogl/deprecated/cogl-vertex-buffer.c b/cogl/cogl/deprecated/cogl-vertex-buffer.c
index 709a9a101..24859a30c 100644
--- a/cogl/cogl/deprecated/cogl-vertex-buffer.c
+++ b/cogl/cogl/deprecated/cogl-vertex-buffer.c
@@ -138,7 +138,7 @@ cogl_vertex_buffer_new (unsigned int n_vertices)
   buffer->primitive = cogl_primitive_new (COGL_VERTICES_MODE_TRIANGLES,
                                           n_vertices, NULL);
 
-  /* return COGL_INVALID_HANDLE; */
+  /* return NULL; */
   return _cogl_vertex_buffer_handle_new (buffer);
 }
 
@@ -1675,7 +1675,7 @@ cogl_vertex_buffer_indices_new (CoglIndicesType  indices_type,
 {
   CoglIndices *indices;
 
-  _COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
+  _COGL_GET_CONTEXT (ctx, NULL);
 
   indices = cogl_indices_new (ctx, indices_type, indices_array, indices_len);
   return _cogl_vertex_buffer_indices_new_real (indices);
@@ -1749,11 +1749,11 @@ _cogl_vertex_buffer_free (CoglVertexBuffer *buffer)
 CoglHandle
 cogl_vertex_buffer_indices_get_for_quads (unsigned int n_indices)
 {
-  _COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
+  _COGL_GET_CONTEXT (ctx, NULL);
 
   if (n_indices <= 256 / 4 * 6)
     {
-      if (ctx->quad_buffer_indices_byte == COGL_INVALID_HANDLE)
+      if (ctx->quad_buffer_indices_byte == NULL)
         {
           /* NB: cogl_get_quad_indices takes n_quads not n_indices... */
           CoglIndices *indices = cogl_get_rectangle_indices (ctx, 256 / 4);
@@ -1770,10 +1770,10 @@ cogl_vertex_buffer_indices_get_for_quads (unsigned int n_indices)
           ctx->quad_buffer_indices_len < n_indices)
         {
           cogl_object_unref (ctx->quad_buffer_indices);
-          ctx->quad_buffer_indices = COGL_INVALID_HANDLE;
+          ctx->quad_buffer_indices = NULL;
         }
 
-      if (ctx->quad_buffer_indices == COGL_INVALID_HANDLE)
+      if (ctx->quad_buffer_indices == NULL)
         {
           /* NB: cogl_get_quad_indices takes n_quads not n_indices... */
           CoglIndices *indices =
diff --git a/cogl/tests/conform/test-just-vertex-shader.c b/cogl/tests/conform/test-just-vertex-shader.c
index 2d0c20567..da1ab1c4c 100644
--- a/cogl/tests/conform/test-just-vertex-shader.c
+++ b/cogl/tests/conform/test-just-vertex-shader.c
@@ -91,7 +91,7 @@ paint_legacy (TestState *state)
   /* Draw it again using the program. It should look exactly the same */
   cogl_program_use (program);
   cogl_rectangle (50, 0, 100, 50);
-  cogl_program_use (COGL_INVALID_HANDLE);
+  cogl_program_use (NULL);
 
   cogl_object_unref (material);
   cogl_object_unref (program);
@@ -163,7 +163,7 @@ paint (TestState *state)
   cogl_object_unref (program);
 
   cogl_rectangle (50, 0, 100, 50);
-  cogl_pipeline_set_user_program (pipeline, COGL_INVALID_HANDLE);
+  cogl_pipeline_set_user_program (pipeline, NULL);
 
   cogl_object_unref (pipeline);
 }
diff --git a/src/tests/clutter/interactive/test-cogl-offscreen.c 
b/src/tests/clutter/interactive/test-cogl-offscreen.c
index 116f03120..b06e6d7f3 100644
--- a/src/tests/clutter/interactive/test-cogl-offscreen.c
+++ b/src/tests/clutter/interactive/test-cogl-offscreen.c
@@ -256,7 +256,7 @@ test_coglbox_map (ClutterActor *actor)
 
   cogl_pop_framebuffer ();
 
-  if (priv->offscreen_id == COGL_INVALID_HANDLE)
+  if (priv->offscreen_id == NULL)
     printf ("Failed creating offscreen to texture!\n");
 }
 
@@ -281,7 +281,7 @@ test_coglbox_init (TestCoglbox *self)
                                                  COGL_TEXTURE_NONE,
                                                 COGL_PIXEL_FORMAT_RGB_888);
 
-  if (priv->texture_id == COGL_INVALID_HANDLE)
+  if (priv->texture_id == NULL)
     printf ("Failed creating texture with size!\n");
 }
 
diff --git a/src/tests/clutter/interactive/test-cogl-shader-glsl.c 
b/src/tests/clutter/interactive/test-cogl-shader-glsl.c
index a269aa476..ed4cf3e92 100644
--- a/src/tests/clutter/interactive/test-cogl-shader-glsl.c
+++ b/src/tests/clutter/interactive/test-cogl-shader-glsl.c
@@ -320,7 +320,7 @@ test_cogl_shader_glsl_main (int argc, char *argv[])
                                         COGL_TEXTURE_NO_ATLAS,
                                         COGL_PIXEL_FORMAT_ANY,
                                         &error);
-  if (redhand == COGL_INVALID_HANDLE)
+  if (redhand == NULL)
     g_error ("image load failed: %s", error->message);
 
   material = cogl_material_new ();
diff --git a/src/tests/clutter/interactive/test-cogl-tex-polygon.c 
b/src/tests/clutter/interactive/test-cogl-tex-polygon.c
index 2a4e78517..3eb5d574c 100644
--- a/src/tests/clutter/interactive/test-cogl-tex-polygon.c
+++ b/src/tests/clutter/interactive/test-cogl-tex-polygon.c
@@ -259,7 +259,7 @@ test_coglbox_init (TestCoglbox *self)
                                  COGL_TEXTURE_NONE,
                                  COGL_PIXEL_FORMAT_ANY,
                                  &error);
-  if (priv->sliced_tex == COGL_INVALID_HANDLE)
+  if (priv->sliced_tex == NULL)
     {
       if (error)
         {
@@ -276,7 +276,7 @@ test_coglbox_init (TestCoglbox *self)
                                 COGL_TEXTURE_NO_SLICING,
                                 COGL_PIXEL_FORMAT_ANY,
                                 &error);
-  if (priv->not_sliced_tex == COGL_INVALID_HANDLE)
+  if (priv->not_sliced_tex == NULL)
     {
       if (error)
         {
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