translate: Take and respect a max_index argument.

1 files changed, 13 insertions, 6 deletions

diff --git a/src/gallium/auxiliary/translate/translate_generic.c b/src/gallium/auxiliary/translate/translate_generic.c
index c3ec9ae3f4..a9272fbb49 100644
--- a/src/gallium/auxiliary/translate/translate_generic.c
+++ b/src/gallium/auxiliary/translate/translate_generic.c
@@ -31,6 +31,7 @@
   */
 
 #include "util/u_memory.h"
+#include "util/u_math.h"
 #include "pipe/p_state.h"
 #include "translate.h"
 
@@ -58,6 +59,7 @@ struct translate_generic {
       
       char *input_ptr;
       unsigned input_stride;
+      unsigned max_index;
 
    } attrib[PIPE_MAX_ATTRIBS];
 
@@ -588,19 +590,22 @@ static void PIPE_CDECL generic_run_elts( struct translate *translate,
       for (attr = 0; attr < nr_attrs; attr++) {
 	 float data[4];
          const char *src;
+         unsigned index;
 
 	 char *dst = (vert + 
 		      tg->attrib[attr].output_offset);
 
          if (tg->attrib[attr].instance_divisor) {
-            src = tg->attrib[attr].input_ptr +
-                  tg->attrib[attr].input_stride *
-                  (instance_id / tg->attrib[attr].instance_divisor);
+            index = instance_id / tg->attrib[attr].instance_divisor;
          } else {
-            src = tg->attrib[attr].input_ptr +
-                  tg->attrib[attr].input_stride * elt;
+            index = elt;
          }
 
+         index = MIN2(index, tg->attrib[attr].max_index);
+
+         src = tg->attrib[attr].input_ptr +
+               tg->attrib[attr].input_stride * index;
+
 	 tg->attrib[attr].fetch( src, data );
 
          if (0) debug_printf("vert %d/%d attr %d: %f %f %f %f\n",
@@ -670,7 +675,8 @@ static void PIPE_CDECL generic_run( struct translate *translate,
 static void generic_set_buffer( struct translate *translate,
 				unsigned buf,
 				const void *ptr,
-				unsigned stride )
+				unsigned stride,
+				unsigned max_index )
 {
    struct translate_generic *tg = translate_generic(translate);
    unsigned i;
@@ -680,6 +686,7 @@ static void generic_set_buffer( struct translate *translate,
 	 tg->attrib[i].input_ptr = ((char *)ptr +
 				    tg->attrib[i].input_offset);
 	 tg->attrib[i].input_stride = stride;
+         tg->attrib[i].max_index = max_index;
       }
    }
 }