[clutter] effects: Delay the creation of the base pipeline

[Emmanuele Bassi <ebassi src gnome org>]

commit b1ff53d98017089667e29135c49bf451446a4f74
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Feb 15 09:30:18 2012 +0000

    effects: Delay the creation of the base pipeline
    
    Unconditionally creating CoglPipeline and CoglSnippets inside the class
    initialization functions does not seem to be enough when dealing with
    headless builds.
    
    Our last resort is to lazily create the base pipeline the first time we
    try to copy it, during the instance initialization.

 clutter/clutter-blur-effect.c       |   37 +++++++++++++++++--------------
 clutter/clutter-colorize-effect.c   |   40 +++++++++++++++++-----------------
 clutter/clutter-desaturate-effect.c |   39 +++++++++++++++++----------------
 3 files changed, 60 insertions(+), 56 deletions(-)
---
diff --git a/clutter/clutter-blur-effect.c b/clutter/clutter-blur-effect.c
index bed7360..69811b1 100644
--- a/clutter/clutter-blur-effect.c
+++ b/clutter/clutter-blur-effect.c
@@ -221,7 +221,6 @@ clutter_blur_effect_class_init (ClutterBlurEffectClass *klass)
   ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   ClutterOffscreenEffectClass *offscreen_class;
-  CoglSnippet *snippet;
 
   gobject_class->dispose = clutter_blur_effect_dispose;
 
@@ -230,28 +229,32 @@ clutter_blur_effect_class_init (ClutterBlurEffectClass *klass)
 
   offscreen_class = CLUTTER_OFFSCREEN_EFFECT_CLASS (klass);
   offscreen_class->paint_target = clutter_blur_effect_paint_target;
-
-  klass->base_pipeline = cogl_pipeline_new ();
-
-  snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_TEXTURE_LOOKUP,
-                              box_blur_glsl_declarations,
-                              NULL);
-  cogl_snippet_set_replace (snippet, box_blur_glsl_shader);
-  cogl_pipeline_add_layer_snippet (klass->base_pipeline, 0, snippet);
-  cogl_object_unref (snippet);
-
-  cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
-                                        0, /* layer number */
-                                        COGL_TEXTURE_TYPE_2D);
 }
 
 static void
 clutter_blur_effect_init (ClutterBlurEffect *self)
 {
-  CoglPipeline *base_pipeline =
-    CLUTTER_BLUR_EFFECT_GET_CLASS (self)->base_pipeline;
+  ClutterBlurEffectClass *klass = CLUTTER_BLUR_EFFECT_GET_CLASS (self);
+
+  if (G_UNLIKELY (klass->base_pipeline == NULL))
+    {
+      CoglSnippet *snippet;
+
+      klass->base_pipeline = cogl_pipeline_new ();
+
+      snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_TEXTURE_LOOKUP,
+                                  box_blur_glsl_declarations,
+                                  NULL);
+      cogl_snippet_set_replace (snippet, box_blur_glsl_shader);
+      cogl_pipeline_add_layer_snippet (klass->base_pipeline, 0, snippet);
+      cogl_object_unref (snippet);
+
+      cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
+                                            0, /* layer number */
+                                            COGL_TEXTURE_TYPE_2D);
+    }
 
-  self->pipeline = cogl_pipeline_copy (base_pipeline);
+  self->pipeline = cogl_pipeline_copy (klass->base_pipeline);
 
   self->pixel_step_uniform =
     cogl_pipeline_get_uniform_location (self->pipeline, "pixel_step");
diff --git a/clutter/clutter-colorize-effect.c b/clutter/clutter-colorize-effect.c
index 82b1f47..e55f3ba 100644
--- a/clutter/clutter-colorize-effect.c
+++ b/clutter/clutter-colorize-effect.c
@@ -227,7 +227,6 @@ clutter_colorize_effect_class_init (ClutterColorizeEffectClass *klass)
   ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   ClutterOffscreenEffectClass *offscreen_class;
-  CoglSnippet *snippet;
 
   offscreen_class = CLUTTER_OFFSCREEN_EFFECT_CLASS (klass);
   offscreen_class->paint_target = clutter_colorize_effect_paint_target;
@@ -252,22 +251,7 @@ clutter_colorize_effect_class_init (ClutterColorizeEffectClass *klass)
                               &default_tint,
                               CLUTTER_PARAM_READWRITE);
 
-  g_object_class_install_properties (gobject_class,
-                                     PROP_LAST,
-                                     obj_props);
-
-
-  klass->base_pipeline = cogl_pipeline_new ();
-
-  snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
-                              colorize_glsl_declarations,
-                              colorize_glsl_source);
-  cogl_pipeline_add_snippet (klass->base_pipeline, snippet);
-  cogl_object_unref (snippet);
-
-  cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
-                                        0, /* layer number */
-                                        COGL_TEXTURE_TYPE_2D);
+  g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
 }
 
 static void
@@ -292,10 +276,26 @@ update_tint_uniform (ClutterColorizeEffect *self)
 static void
 clutter_colorize_effect_init (ClutterColorizeEffect *self)
 {
-  CoglPipeline *base_pipeline =
-    CLUTTER_COLORIZE_EFFECT_GET_CLASS (self)->base_pipeline;
+  ClutterColorizeEffectClass *klass = CLUTTER_COLORIZE_EFFECT_GET_CLASS (self);
+
+  if (G_UNLIKELY (klass->base_pipeline == NULL))
+    {
+      CoglSnippet *snippet;
+
+      klass->base_pipeline = cogl_pipeline_new ();
+
+      snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
+                                  colorize_glsl_declarations,
+                                  colorize_glsl_source);
+      cogl_pipeline_add_snippet (klass->base_pipeline, snippet);
+      cogl_object_unref (snippet);
+
+      cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
+                                            0, /* layer number */
+                                            COGL_TEXTURE_TYPE_2D);
+    }
 
-  self->pipeline = cogl_pipeline_copy (base_pipeline);
+  self->pipeline = cogl_pipeline_copy (klass->base_pipeline);
 
   self->tint_uniform =
     cogl_pipeline_get_uniform_location (self->pipeline, "tint");
diff --git a/clutter/clutter-desaturate-effect.c b/clutter/clutter-desaturate-effect.c
index fc3c263..d127bd5 100644
--- a/clutter/clutter-desaturate-effect.c
+++ b/clutter/clutter-desaturate-effect.c
@@ -249,7 +249,6 @@ clutter_desaturate_effect_class_init (ClutterDesaturateEffectClass *klass)
   ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   ClutterOffscreenEffectClass *offscreen_class;
-  CoglSnippet *snippet;
 
   offscreen_class = CLUTTER_OFFSCREEN_EFFECT_CLASS (klass);
   offscreen_class->paint_target = clutter_desaturate_effect_paint_target;
@@ -276,30 +275,32 @@ clutter_desaturate_effect_class_init (ClutterDesaturateEffectClass *klass)
   gobject_class->set_property = clutter_desaturate_effect_set_property;
   gobject_class->get_property = clutter_desaturate_effect_get_property;
 
-  g_object_class_install_properties (gobject_class,
-                                     PROP_LAST,
-                                     obj_props);
-
-  klass->base_pipeline = cogl_pipeline_new ();
-
-  snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
-                              desaturate_glsl_declarations,
-                              desaturate_glsl_source);
-  cogl_pipeline_add_snippet (klass->base_pipeline, snippet);
-  cogl_object_unref (snippet);
-
-  cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
-                                        0, /* layer number */
-                                        COGL_TEXTURE_TYPE_2D);
+  g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
 }
 
 static void
 clutter_desaturate_effect_init (ClutterDesaturateEffect *self)
 {
-  CoglPipeline *base_pipeline =
-    CLUTTER_DESATURATE_EFFECT_GET_CLASS (self)->base_pipeline;
+  ClutterDesaturateEffectClass *klass = CLUTTER_DESATURATE_EFFECT_GET_CLASS (self);
+
+  if (G_UNLIKELY (klass->base_pipeline == NULL))
+    {
+      CoglSnippet *snippet;
+
+      klass->base_pipeline = cogl_pipeline_new ();
+
+      snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
+                                  desaturate_glsl_declarations,
+                                  desaturate_glsl_source);
+      cogl_pipeline_add_snippet (klass->base_pipeline, snippet);
+      cogl_object_unref (snippet);
+
+      cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
+                                            0, /* layer number */
+                                            COGL_TEXTURE_TYPE_2D);
+    }
 
-  self->pipeline = cogl_pipeline_copy (base_pipeline);
+  self->pipeline = cogl_pipeline_copy (klass->base_pipeline);
 
   self->factor_uniform =
     cogl_pipeline_get_uniform_location (self->pipeline, "factor");