[cogl/wip/neil/master-next: 7/10] pipeline-arbfp: Check for fog on the pipeline not the legacy state

[Neil Roberts <nroberts src gnome org>]

commit e3f6dac34b9b091fb657442564f83e2440566c97
Author: Neil Roberts <neil linux intel com>
Date:   Wed Sep 14 15:25:58 2011 +0100

    pipeline-arbfp: Check for fog on the pipeline not the legacy state
    
    The ARBfp backend can't handle fog so it tries to check for when it's
    enabled and bails out. However it was checking using the global legacy
    state value on the CoglContext but this doesn't necessarily reflect
    the state that will actually be used by the pipeline because Cogl may
    have internally pushed a different pipeline.
    
    This patch adds an internal _cogl_pipeline_get_fog_enabled which the
    ARBfp backend now uses.

 cogl/cogl-pipeline-fragend-arbfp.c |    2 +-
 cogl/cogl-pipeline-private.h       |    3 +++
 cogl/cogl-pipeline.c               |   12 ++++++++++++
 3 files changed, 16 insertions(+), 1 deletions(-)
---
diff --git a/cogl/cogl-pipeline-fragend-arbfp.c b/cogl/cogl-pipeline-fragend-arbfp.c
index 294daa9..8c25b36 100644
--- a/cogl/cogl-pipeline-fragend-arbfp.c
+++ b/cogl/cogl-pipeline-fragend-arbfp.c
@@ -165,7 +165,7 @@ _cogl_pipeline_fragend_arbfp_start (CoglPipeline *pipeline,
     return FALSE;
 
   /* TODO: support fog */
-  if (ctx->legacy_fog_state.enabled)
+  if (_cogl_pipeline_get_fog_enabled (pipeline))
     return FALSE;
 
   user_program = cogl_pipeline_get_user_program (pipeline);
diff --git a/cogl/cogl-pipeline-private.h b/cogl/cogl-pipeline-private.h
index 7e019c2..de96c6c 100644
--- a/cogl/cogl-pipeline-private.h
+++ b/cogl/cogl-pipeline-private.h
@@ -1184,6 +1184,9 @@ void
 _cogl_pipeline_set_blend_enabled (CoglPipeline *pipeline,
                                   CoglPipelineBlendEnable enable);
 
+gboolean
+_cogl_pipeline_get_fog_enabled (CoglPipeline *pipeline);
+
 void
 _cogl_pipeline_set_static_breadcrumb (CoglPipeline *pipeline,
                                       const char *breadcrumb);
diff --git a/cogl/cogl-pipeline.c b/cogl/cogl-pipeline.c
index cdeac12..25518b8 100644
--- a/cogl/cogl-pipeline.c
+++ b/cogl/cogl-pipeline.c
@@ -2859,6 +2859,18 @@ _cogl_pipeline_update_authority (CoglPipeline *pipeline,
     }
 }
 
+gboolean
+_cogl_pipeline_get_fog_enabled (CoglPipeline *pipeline)
+{
+  CoglPipeline *authority;
+
+  g_return_val_if_fail (cogl_is_pipeline (pipeline), FALSE);
+
+  authority =
+    _cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_FOG);
+  return authority->big_state->fog_state.enabled;
+}
+
 unsigned long
 _cogl_pipeline_get_age (CoglPipeline *pipeline)
 {