1 files changed, 89 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pt_elts.c b/src/gallium/auxiliary/draw/draw_pt_elts.c
new file mode 100644
index 0000000000..88f4d9f495
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_pt_elts.c
@@ -0,0 +1,89 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+ /*
+  * Authors:
+  *   Keith Whitwell <keith@tungstengraphics.com>
+  */
+
+#include "draw/draw_pt.h"
+#include "draw/draw_private.h"
+
+/* Neat get_elt func that also works for varrays drawing by encoding
+ * the start value into a pointer.  
+ */
+
+static unsigned elt_uint( const void *elts, unsigned idx )
+{
+   return *(((const uint *)elts) + idx);
+}
+
+static unsigned elt_ushort( const void *elts, unsigned idx )
+{
+   return *(((const ushort *)elts) + idx);
+}
+
+static unsigned elt_ubyte( const void *elts, unsigned idx )
+{
+   return *(((const ubyte *)elts) + idx);
+}
+
+static unsigned elt_vert( const void *elts, unsigned idx )
+{
+   /* unsigned index is packed in the pointer */
+   return (unsigned)(uintptr_t)elts + idx;
+}
+
+pt_elt_func draw_pt_elt_func( struct draw_context *draw )
+{
+   switch (draw->pt.user.eltSize) {
+   case 0: return &elt_vert;
+   case 1: return &elt_ubyte;
+   case 2: return &elt_ushort; 
+   case 4: return &elt_uint;
+   default: return NULL;
+   }
+}     
+
+const void *draw_pt_elt_ptr( struct draw_context *draw,
+                             unsigned start )
+{
+   const char *elts = draw->pt.user.elts;
+
+   switch (draw->pt.user.eltSize) {
+   case 0: 
+      return (const void *)(((const ubyte *)NULL) + start);
+   case 1: 
+      return (const void *)(((const ubyte *)elts) + start);
+   case 2: 
+      return (const void *)(((const ushort *)elts) + start);
+   case 4: 
+      return (const void *)(((const uint *)elts) + start);
+   default:
+      return NULL;
+   }
+}