Use COGL_FLAGS_* for the context's private feature flags

Previously the private feature flags were stored in an enum and we
already had 31 flags. Adding the 32nd flag would presumably make it
add -2³¹ as one of the values which might cause problems. To avoid
this we'll just use an fixed-size array of longs and use indices for
the enum values like we do for the public features.

A slight complication with this is in the CoglDriverDescription where
we were previously using a static intialised value to describe the set
of features that the driver supports. We can't easily do this with the
flags array so instead the features are stored in a fixed-size array
of indices.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
(cherry picked from commit d94cb984e3c93630f3c2e6e3be9d189672aa20f3)

Conflicts:
	cogl/cogl-context-private.h
	cogl/cogl-context.c
	cogl/cogl-private.h
	cogl/cogl-renderer.c
	cogl/driver/gl/cogl-pipeline-opengl.c
	cogl/driver/gl/gl/cogl-driver-gl.c
	cogl/driver/gl/gl/cogl-pipeline-progend-fixed-arbfp.c
	cogl/driver/gl/gles/cogl-driver-gles.c
	cogl/driver/nop/cogl-driver-nop.c

1 files changed, 3 insertions, 1 deletions

diff --git a/cogl/cogl-context-private.h b/cogl/cogl-context-private.h
index 91a264a6..7f1b054c 100644
--- a/cogl/cogl-context-private.h
+++ b/cogl/cogl-context-private.h
@@ -54,6 +54,7 @@
 #include "cogl-fence-private.h"
 #include "cogl-poll-private.h"
 #include "cogl-path/cogl-path-types.h"
+#include "cogl-private.h"
 
 typedef struct
 {
@@ -92,7 +93,8 @@ struct _CoglContext
   /* Features cache */
   unsigned long features[COGL_FLAGS_N_LONGS_FOR_SIZE (_COGL_N_FEATURE_IDS)];
   CoglFeatureFlags feature_flags; /* legacy/deprecated feature flags */
-  CoglPrivateFeatureFlags private_feature_flags;
+  unsigned long private_features
+    [COGL_FLAGS_N_LONGS_FOR_SIZE (COGL_N_PRIVATE_FEATURES)];
 
   CoglBool needs_viewport_scissor_workaround;
   CoglFramebuffer *viewport_scissor_workaround_framebuffer;