[cogl] framebuffer: dec current_pipeline_age to force color_mask

[Robert Bragg <rbragg src gnome org>]

commit b8503418ff693afd16023f3e05e7907492745820
Author: Robert Bragg <robert linux intel com>
Date:   Thu Jul 21 00:41:00 2011 +0100

    framebuffer: dec current_pipeline_age to force color_mask
    
    When we need to guarantee that the glColorMask is re-asserted the next
    time that a primitive is drawn it is not enough to just OR in the
    LOGIC_OPS flag to ctx->current_pipeline_changes_since_flush because
    _cogl_pipeline_flush_gl_state actually checks the age of the pipeline
    before checking that. If the pipeline hasn't aged then we bail out
    early. This makes sure we decrement
    ctx->current_pipeline_changes_since_flush so the next time we come to
    flush a pipeline we will see a differing age.
    
    Reviewed-by: Neil Roberts <neil linux intel com>

 cogl/cogl-framebuffer.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/cogl/cogl-framebuffer.c b/cogl/cogl-framebuffer.c
index 6ece74d..a86e4a6 100644
--- a/cogl/cogl-framebuffer.c
+++ b/cogl/cogl-framebuffer.c
@@ -257,6 +257,7 @@ _cogl_clear4f (unsigned long buffers,
           /* Make sure the ColorMask is updated when the next primitive is drawn */
           ctx->current_pipeline_changes_since_flush |=
             COGL_PIPELINE_STATE_LOGIC_OPS;
+          ctx->current_pipeline_age--;
         }
     }
 
@@ -1528,6 +1529,7 @@ cogl_framebuffer_set_color_mask (CoglFramebuffer *framebuffer,
   /* Make sure the ColorMask is updated when the next primitive is drawn */
   ctx->current_pipeline_changes_since_flush |=
     COGL_PIPELINE_STATE_LOGIC_OPS;
+  ctx->current_pipeline_age--;
 }
 
 gboolean