mesa: Introduce enabled bitfield helper functions.

Depending on the installed shader type, different arrays are used
from gl_array_object. Provide helper functions that compute
the bitmask of these arrays that are finally enabled for a given
shader type. The will be used in a followup change.

Signed-off-by: Mathias Fröhlich <Mathias.Froehlich@web.de>
Reviewed-by: Brian Paul <brianp@vmware.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/mesa/main/arrayobj.h b/src/mesa/main/arrayobj.h
index 0b5a013..717c791 100644
--- a/src/mesa/main/arrayobj.h
+++ b/src/mesa/main/arrayobj.h
@@ -29,6 +29,7 @@
 #define ARRAYOBJ_H
 
 #include "glheader.h"
+#include "mtypes.h"
 
 struct gl_context;
 
@@ -64,6 +65,42 @@ extern void
 _mesa_update_array_object_max_element(struct gl_context *ctx,
                                       struct gl_array_object *arrayObj);
 
+/** Returns the bitmask of all enabled arrays in fixed function mode.
+ *
+ *  In fixed function mode only the traditional fixed function arrays
+ *  are available.
+ */
+static inline GLbitfield64
+_mesa_array_object_get_enabled_ff(const struct gl_array_object *arrayObj)
+{
+   return arrayObj->_Enabled & VERT_BIT_FF_ALL;
+}
+
+/** Returns the bitmask of all enabled arrays in nv shader mode.
+ *
+ *  In nv shader mode, the nv generic arrays take precedence over
+ *  the legacy arrays.
+ */
+static inline GLbitfield64
+_mesa_array_object_get_enabled_nv(const struct gl_array_object *arrayObj)
+{
+   GLbitfield64 enabled = arrayObj->_Enabled;
+   return enabled & ~(VERT_BIT_FF_NVALIAS & (enabled >> VERT_ATTRIB_GENERIC0));
+}
+
+/** Returns the bitmask of all enabled arrays in arb/glsl shader mode.
+ *
+ *  In arb/glsl shader mode all the fixed function and the arb/glsl generic
+ *  arrays are available. Only the first generic array takes
+ *  precedence over the legacy position array.
+ */
+static inline GLbitfield64
+_mesa_array_object_get_enabled_arb(const struct gl_array_object *arrayObj)
+{
+   GLbitfield64 enabled = arrayObj->_Enabled;
+   return enabled & ~(VERT_BIT_POS & (enabled >> VERT_ATTRIB_GENERIC0));
+}
+
 
 /*
  * API functions