[cogl] pipeline: lazily get ctx in _get_layer

[Robert Bragg <rbragg src gnome org>]

commit f16d3756dfafa63521954842c8365e8862bfd126
Author: Robert Bragg <robert linux intel com>
Date:   Tue Sep 20 20:46:38 2011 +0100

    pipeline: lazily get ctx in _get_layer
    
    We only need a ctx pointer if we need to refer to the default_layer_x
    layers to copy as templates so only call  _cogl_context_get_default()
    once we need to copy a template. _cogl_context_get_default() was
    starting to show up in profiles and this was the main cause.
    
    Reviewed-by: Neil Roberts <neil linux intel com>

 cogl/cogl-pipeline.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/cogl/cogl-pipeline.c b/cogl/cogl-pipeline.c
index 0466740..140a488 100644
--- a/cogl/cogl-pipeline.c
+++ b/cogl/cogl-pipeline.c
@@ -1615,8 +1615,7 @@ _cogl_pipeline_get_layer (CoglPipeline *pipeline,
   CoglPipelineLayer *layer;
   int unit_index;
   int i;
-
-  _COGL_GET_CONTEXT (ctx, NULL);
+  CoglContext *ctx;
 
   /* The layer index of the layer we want info about */
   layer_info.layer_index = layer_index;
@@ -1645,6 +1644,8 @@ _cogl_pipeline_get_layer (CoglPipeline *pipeline,
   if (layer_info.layer)
     return layer_info.layer;
 
+  ctx = _cogl_context_get_default ();
+
   unit_index = layer_info.insert_after + 1;
   if (unit_index == 0)
     layer = _cogl_pipeline_layer_copy (ctx->default_layer_0);