[Mesa-dev] [PATCH 2/3] mesa: Introduce enabled bitfield helper functions.

[Mathias Froehlich]

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 at web.de>
---
 src/mesa/main/arrayobj.h |   37 +++++++++++++++++++++++++++++++++++++
 src/mesa/main/mtypes.h   |    4 ++++
 2 files changed, 41 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
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index b381ad2..f8ef01d 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -206,9 +206,13 @@ typedef enum
 #define VERT_BIT_TEX(i)          VERT_BIT(VERT_ATTRIB_TEX(i))
 #define VERT_BIT_TEX_ALL         \
    BITFIELD64_RANGE(VERT_ATTRIB_TEX(0), VERT_ATTRIB_TEX_MAX)
+#define VERT_BIT_FF_NVALIAS      \
+   BITFIELD64_RANGE(VERT_ATTRIB_POS, VERT_ATTRIB_TEX(VERT_ATTRIB_TEX_MAX))
+
 #define VERT_BIT_GENERIC_NV(i)   VERT_BIT(VERT_ATTRIB_GENERIC_NV(i))
 #define VERT_BIT_GENERIC_NV_ALL  \
    BITFIELD64_RANGE(VERT_ATTRIB_GENERIC_NV(0), VERT_ATTRIB_GENERIC_NV_MAX)
+
 #define VERT_BIT_GENERIC(i)      VERT_BIT(VERT_ATTRIB_GENERIC(i))
 #define VERT_BIT_GENERIC_ALL     \
    BITFIELD64_RANGE(VERT_ATTRIB_GENERIC(0), VERT_ATTRIB_GENERIC_MAX)
-- 
1.7.7.5