1 files changed, 113 insertions, 0 deletions
diff --git a/src/gallium/aux/draw/draw_debug.c b/src/gallium/aux/draw/draw_debug.c
new file mode 100644
index 00000000000..d6220b5f62c
--- /dev/null
+++ b/src/gallium/aux/draw/draw_debug.c
@@ -0,0 +1,113 @@
+/**************************************************************************
+ * 
+ * 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 <[email protected]>
+  */
+
+#include "draw_private.h"
+#include "draw_context.h"
+
+
+
+static void
+draw_prim_info(unsigned prim, unsigned *first, unsigned *incr)
+{
+   assert(prim >= PIPE_PRIM_POINTS);
+   assert(prim <= PIPE_PRIM_POLYGON);
+
+   switch (prim) {
+   case PIPE_PRIM_POINTS:
+      *first = 1;
+      *incr = 1;
+      break;
+   case PIPE_PRIM_LINES:
+      *first = 2;
+      *incr = 2;
+      break;
+   case PIPE_PRIM_LINE_STRIP:
+      *first = 2;
+      *incr = 1;
+      break;
+   case PIPE_PRIM_LINE_LOOP:
+      *first = 2;
+      *incr = 1;
+      break;
+   case PIPE_PRIM_TRIANGLES:
+      *first = 3;
+      *incr = 3;
+      break;
+   case PIPE_PRIM_TRIANGLE_STRIP:
+      *first = 3;
+      *incr = 1;
+      break;
+   case PIPE_PRIM_TRIANGLE_FAN:
+   case PIPE_PRIM_POLYGON:
+      *first = 3;
+      *incr = 1;
+      break;
+   case PIPE_PRIM_QUADS:
+      *first = 4;
+      *incr = 4;
+      break;
+   case PIPE_PRIM_QUAD_STRIP:
+      *first = 4;
+      *incr = 2;
+      break;
+   default:
+      assert(0);
+      *first = 1;
+      *incr = 1;
+      break;
+   }
+}
+
+
+unsigned 
+draw_trim_prim( unsigned mode, unsigned count )
+{
+   unsigned length, first, incr;
+
+   draw_prim_info( mode, &first, &incr );
+
+   if (count < first)
+      length = 0;
+   else
+      length = count - (count - first) % incr; 
+
+   return length;
+}
+
+
+boolean
+draw_validate_prim( unsigned mode, unsigned count )
+{
+   return (count > 0 &&
+           count == draw_trim_prim( mode, count ));
+}
+