Merge branch 'gallium-index-bias'

38 files changed, 247 insertions, 152 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index d490d3325c2..4196f01e0b2 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -456,12 +456,14 @@ void draw_set_render( struct draw_context *draw,
 void
 draw_set_mapped_element_buffer_range( struct draw_context *draw,
                                       unsigned eltSize,
+                                      int eltBias,
                                       unsigned min_index,
                                       unsigned max_index,
                                       const void *elements )
 {
    draw->pt.user.elts = elements;
    draw->pt.user.eltSize = eltSize;
+   draw->pt.user.eltBias = eltBias;
    draw->pt.user.min_index = min_index;
    draw->pt.user.max_index = max_index;
 }
@@ -470,10 +472,12 @@ draw_set_mapped_element_buffer_range( struct draw_context *draw,
 void
 draw_set_mapped_element_buffer( struct draw_context *draw,
                                 unsigned eltSize,
+                                int eltBias,
                                 const void *elements )
 {
    draw->pt.user.elts = elements;
    draw->pt.user.eltSize = eltSize;
+   draw->pt.user.eltBias = eltBias;
    draw->pt.user.min_index = 0;
    draw->pt.user.max_index = 0xffffffff;
 }
diff --git a/src/gallium/auxiliary/draw/draw_context.h b/src/gallium/auxiliary/draw/draw_context.h
index 51767bb214d..7b41bb48dd3 100644
--- a/src/gallium/auxiliary/draw/draw_context.h
+++ b/src/gallium/auxiliary/draw/draw_context.h
@@ -140,12 +140,14 @@ void draw_set_vertex_elements(struct draw_context *draw,
 void
 draw_set_mapped_element_buffer_range( struct draw_context *draw,
                                       unsigned eltSize,
+                                      int eltBias,
                                       unsigned min_index,
                                       unsigned max_index,
                                       const void *elements );
 
 void draw_set_mapped_element_buffer( struct draw_context *draw,
                                      unsigned eltSize, 
+                                     int eltBias,
                                      const void *elements );
 
 void draw_set_mapped_vertex_buffer(struct draw_context *draw,
diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index fa20c8ecc63..0b3c9e69bd5 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -150,6 +150,7 @@ struct draw_context
          const void *elts;
          /** bytes per index (0, 1, 2 or 4) */
          unsigned eltSize;
+         int eltBias;
          unsigned min_index;
          unsigned max_index;
          
diff --git a/src/gallium/auxiliary/draw/draw_pt.c b/src/gallium/auxiliary/draw/draw_pt.c
index cea186c1bf3..b5876bb1bdb 100644
--- a/src/gallium/auxiliary/draw/draw_pt.c
+++ b/src/gallium/auxiliary/draw/draw_pt.c
@@ -111,6 +111,7 @@ draw_pt_arrays(struct draw_context *draw,
    frontend->run(frontend, 
                  draw_pt_elt_func(draw),
                  draw_pt_elt_ptr(draw, start),
+                 draw->pt.user.eltBias,
                  count);
 
    frontend->finish( frontend );
@@ -224,8 +225,11 @@ draw_print_arrays(struct draw_context *draw, uint prim, int start, uint count)
             break;
          default:
             assert(0);
+            return;
          }
-         debug_printf("Element[%u + %u] -> Vertex %u:\n", start, i, ii);
+         ii += draw->pt.user.eltBias;
+         debug_printf("Element[%u + %u] + %i -> Vertex %u:\n", start, i,
+                      draw->pt.user.eltBias, ii);
       }
       else {
          /* non-indexed arrays */
diff --git a/src/gallium/auxiliary/draw/draw_pt.h b/src/gallium/auxiliary/draw/draw_pt.h
index c2797a759ee..3e3ea320cc0 100644
--- a/src/gallium/auxiliary/draw/draw_pt.h
+++ b/src/gallium/auxiliary/draw/draw_pt.h
@@ -67,6 +67,7 @@ struct draw_pt_front_end {
    void (*run)( struct draw_pt_front_end *,
                 pt_elt_func elt_func,
                 const void *elt_ptr,
+                int elt_bias,
                 unsigned count );
 
    void (*finish)( struct draw_pt_front_end * );
diff --git a/src/gallium/auxiliary/draw/draw_pt_varray_tmp_linear.h b/src/gallium/auxiliary/draw/draw_pt_varray_tmp_linear.h
index f0aec5febab..a292346be95 100644
--- a/src/gallium/auxiliary/draw/draw_pt_varray_tmp_linear.h
+++ b/src/gallium/auxiliary/draw/draw_pt_varray_tmp_linear.h
@@ -6,6 +6,7 @@ static unsigned trim( unsigned count, unsigned first, unsigned incr )
 static void FUNC(struct draw_pt_front_end *frontend,
                  pt_elt_func get_elt,
                  const void *elts,
+                 int elt_bias,
                  unsigned count)
 {
    struct varray_frontend *varray = (struct varray_frontend *)frontend;
@@ -14,6 +15,8 @@ static void FUNC(struct draw_pt_front_end *frontend,
    unsigned j;
    unsigned first, incr;
 
+   assert(elt_bias == 0);
+
    draw_pt_split_prim(varray->input_prim, &first, &incr);
    
    /* Sanitize primitive length:
diff --git a/src/gallium/auxiliary/draw/draw_pt_vcache.c b/src/gallium/auxiliary/draw/draw_pt_vcache.c
index 757c4874545..37ffbac4f92 100644
--- a/src/gallium/auxiliary/draw/draw_pt_vcache.c
+++ b/src/gallium/auxiliary/draw/draw_pt_vcache.c
@@ -329,6 +329,7 @@ static INLINE void
 vcache_check_run( struct draw_pt_front_end *frontend, 
                   pt_elt_func get_elt,
                   const void *elts,
+                  int elt_bias,
                   unsigned draw_count )
 {
    struct vcache_frontend *vcache = (struct vcache_frontend *)frontend; 
@@ -346,7 +347,7 @@ vcache_check_run( struct draw_pt_front_end *frontend,
                        vcache->fetch_max,
                        draw_count);
       
-   if (max_index >= DRAW_PIPE_MAX_VERTICES ||
+   if (elt_bias + max_index >= DRAW_PIPE_MAX_VERTICES ||
        fetch_count >= UNDEFINED_VERTEX_ID ||
        fetch_count > draw_count) {
       if (0) debug_printf("fail\n");
@@ -362,8 +363,11 @@ vcache_check_run( struct draw_pt_front_end *frontend,
    }
 
 
+   assert((elt_bias >= 0 && min_index + elt_bias >= min_index) ||
+          (elt_bias <  0 && min_index + elt_bias <  min_index));
+
    if (min_index == 0 &&
-       index_size == 2) 
+       index_size == 2)
    {
       transformed_elts = (const ushort *)elts;
    }
@@ -433,7 +437,7 @@ vcache_check_run( struct draw_pt_front_end *frontend,
 
    if (fetch_count < UNDEFINED_VERTEX_ID)
       ok = vcache->middle->run_linear_elts( vcache->middle,
-                                            min_index, /* start */
+                                            min_index + elt_bias, /* start */
                                             fetch_count,
                                             transformed_elts,
                                             draw_count );
@@ -447,7 +451,7 @@ vcache_check_run( struct draw_pt_front_end *frontend,
                 fetch_count, draw_count);
 
  fail:
-   vcache_run( frontend, get_elt, elts, draw_count );
+   vcache_run( frontend, get_elt, elts, elt_bias, draw_count );
 }
 
 
diff --git a/src/gallium/auxiliary/draw/draw_pt_vcache_tmp.h b/src/gallium/auxiliary/draw/draw_pt_vcache_tmp.h
index 7cba8547f15..f7a63de3ba9 100644
--- a/src/gallium/auxiliary/draw/draw_pt_vcache_tmp.h
+++ b/src/gallium/auxiliary/draw/draw_pt_vcache_tmp.h
@@ -3,6 +3,7 @@
 static void FUNC( struct draw_pt_front_end *frontend, 
                   pt_elt_func get_elt,
                   const void *elts,
+                  int elt_bias,
                   unsigned count )
 {
    struct vcache_frontend *vcache = (struct vcache_frontend *)frontend;
@@ -20,7 +21,7 @@ static void FUNC( struct draw_pt_front_end *frontend,
    case PIPE_PRIM_POINTS:
       for (i = 0; i < count; i ++) {
 	 POINT( vcache,
-                get_elt(elts, i + 0) );
+                get_elt(elts, i + 0) + elt_bias );
       }
       break;
 
@@ -28,8 +29,8 @@ static void FUNC( struct draw_pt_front_end *frontend,
       for (i = 0; i+1 < count; i += 2) {
          LINE( vcache, 
                DRAW_PIPE_RESET_STIPPLE,
-               get_elt(elts, i + 0),
-               get_elt(elts, i + 1));
+               get_elt(elts, i + 0) + elt_bias,
+               get_elt(elts, i + 1) + elt_bias);
       }
       break;
 
@@ -40,14 +41,14 @@ static void FUNC( struct draw_pt_front_end *frontend,
          for (i = 1; i < count; i++, flags = 0) {
             LINE( vcache, 
                   flags,
-                  get_elt(elts, i - 1),
-                  get_elt(elts, i ));
+                  get_elt(elts, i - 1) + elt_bias,
+                  get_elt(elts, i ) + elt_bias);
          }
 
 	 LINE( vcache, 
                flags,
-               get_elt(elts, i - 1),
-               get_elt(elts, 0 ));
+               get_elt(elts, i - 1) + elt_bias,
+               get_elt(elts, 0 ) + elt_bias);
       }
       break;
 
@@ -56,8 +57,8 @@ static void FUNC( struct draw_pt_front_end *frontend,
       for (i = 1; i < count; i++, flags = 0) {
          LINE( vcache, 
                flags,
-               get_elt(elts, i - 1),
-               get_elt(elts, i ));
+               get_elt(elts, i - 1) + elt_bias,
+               get_elt(elts, i ) + elt_bias);
       }
       break;
 
@@ -65,9 +66,9 @@ static void FUNC( struct draw_pt_front_end *frontend,
       for (i = 0; i+2 < count; i += 3) {
          TRIANGLE( vcache,
                    DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, 
-                   get_elt(elts, i + 0),
-                   get_elt(elts, i + 1),
-                   get_elt(elts, i + 2 ));
+                   get_elt(elts, i + 0) + elt_bias,
+                   get_elt(elts, i + 1) + elt_bias,
+                   get_elt(elts, i + 2 ) + elt_bias);
       }
       break;
 
@@ -76,18 +77,18 @@ static void FUNC( struct draw_pt_front_end *frontend,
          for (i = 0; i+2 < count; i++) {
             TRIANGLE( vcache,
                       DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, 
-                      get_elt(elts, i + 0),
-                      get_elt(elts, i + 1 + (i&1)),
-                      get_elt(elts, i + 2 - (i&1)));
+                      get_elt(elts, i + 0) + elt_bias,
+                      get_elt(elts, i + 1 + (i&1)) + elt_bias,
+                      get_elt(elts, i + 2 - (i&1)) + elt_bias);
          }
       }
       else {
          for (i = 0; i+2 < count; i++) {
             TRIANGLE( vcache,
                       DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, 
-                      get_elt(elts, i + 0 + (i&1)),
-                      get_elt(elts, i + 1 - (i&1)),
-                      get_elt(elts, i + 2 ));
+                      get_elt(elts, i + 0 + (i&1)) + elt_bias,
+                      get_elt(elts, i + 1 - (i&1)) + elt_bias,
+                      get_elt(elts, i + 2 ) + elt_bias);
          }
       }
       break;
@@ -98,18 +99,18 @@ static void FUNC( struct draw_pt_front_end *frontend,
             for (i = 0; i+2 < count; i++) {
                TRIANGLE( vcache,
                          DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, 
-                         get_elt(elts, i + 1),
-                         get_elt(elts, i + 2),
-                         get_elt(elts, 0 ));
+                         get_elt(elts, i + 1) + elt_bias,
+                         get_elt(elts, i + 2) + elt_bias,
+                         get_elt(elts, 0 ) + elt_bias);
             }
          }
          else {
             for (i = 0; i+2 < count; i++) {
                TRIANGLE( vcache,
                          DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, 
-                         get_elt(elts, 0),
-                         get_elt(elts, i + 1),
-                         get_elt(elts, i + 2 ));
+                         get_elt(elts, 0) + elt_bias,
+                         get_elt(elts, i + 1) + elt_bias,
+                         get_elt(elts, i + 2 ) + elt_bias);
             }
          }
       }
@@ -119,20 +120,20 @@ static void FUNC( struct draw_pt_front_end *frontend,
    case PIPE_PRIM_QUADS:
       for (i = 0; i+3 < count; i += 4) {
          QUAD( vcache,
-               get_elt(elts, i + 0),
-               get_elt(elts, i + 1),
-               get_elt(elts, i + 2),
-               get_elt(elts, i + 3) );
+               get_elt(elts, i + 0) + elt_bias,
+               get_elt(elts, i + 1) + elt_bias,
+               get_elt(elts, i + 2) + elt_bias,
+               get_elt(elts, i + 3) + elt_bias );
       }
       break;
 
    case PIPE_PRIM_QUAD_STRIP:
       for (i = 0; i+3 < count; i += 2) {
          QUAD( vcache,
-               get_elt(elts, i + 2),
-               get_elt(elts, i + 0),
-               get_elt(elts, i + 1),
-               get_elt(elts, i + 3) );
+               get_elt(elts, i + 2) + elt_bias,
+               get_elt(elts, i + 0) + elt_bias,
+               get_elt(elts, i + 1) + elt_bias,
+               get_elt(elts, i + 3) + elt_bias );
       }
       break;
 
@@ -165,16 +166,16 @@ static void FUNC( struct draw_pt_front_end *frontend,
             if (flatfirst) {
                TRIANGLE( vcache,
                          flags,
-                         get_elt(elts, 0),
-                         get_elt(elts, i + 1),
-                         get_elt(elts, i + 2) );
+                         get_elt(elts, 0) + elt_bias,
+                         get_elt(elts, i + 1) + elt_bias,
+                         get_elt(elts, i + 2) + elt_bias );
             }
             else {
                TRIANGLE( vcache,
                          flags,
-                         get_elt(elts, i + 1),
-                         get_elt(elts, i + 2),
-                         get_elt(elts, 0));
+                         get_elt(elts, i + 1) + elt_bias,
+                         get_elt(elts, i + 2) + elt_bias,
+                         get_elt(elts, 0) + elt_bias);
             }
 	 }
       }
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst
index 7439d100973..c82e681a254 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -153,6 +153,12 @@ vertex attributes.
 If ``indexBuffer`` is NULL, the sequential numbers are used directly
 as indices to fetch vertex attributes.
 
+``indexBias`` is a value which is added to every index read from the index 
+buffer before fetching vertex attributes.
+
+``minIndex`` and ``maxIndex`` describe minimum and maximum index contained in
+the index buffer.
+
 If a given vertex element has ``instance_divisor`` set to 0, it is said
 it contains per-vertex data and effective vertex attribute address needs
 to be recalculated for every index.
diff --git a/src/gallium/drivers/cell/ppu/cell_draw_arrays.c b/src/gallium/drivers/cell/ppu/cell_draw_arrays.c
index 80e94a79df7..b50a30bee80 100644
--- a/src/gallium/drivers/cell/ppu/cell_draw_arrays.c
+++ b/src/gallium/drivers/cell/ppu/cell_draw_arrays.c
@@ -59,6 +59,7 @@ static void
 cell_draw_range_elements(struct pipe_context *pipe,
                          struct pipe_resource *indexBuffer,
                          unsigned indexSize,
+                         int indexBias,
                          unsigned min_index,
                          unsigned max_index,
                          unsigned mode, unsigned start, unsigned count)
@@ -84,11 +85,11 @@ cell_draw_range_elements(struct pipe_context *pipe,
    /* Map index buffer, if present */
    if (indexBuffer) {
       void *mapped_indexes = cell_resource(indexBuffer)->data;
-      draw_set_mapped_element_buffer(draw, indexSize, mapped_indexes);
+      draw_set_mapped_element_buffer(draw, indexSize, indexBias, mapped_indexes);
    }
    else {
       /* no index/element buffer */
-      draw_set_mapped_element_buffer(draw, 0, NULL);
+      draw_set_mapped_element_buffer(draw, 0, 0, NULL);
    }
 
 
@@ -117,11 +118,11 @@ cell_draw_range_elements(struct pipe_context *pipe,
 static void
 cell_draw_elements(struct pipe_context *pipe,
                    struct pipe_resource *indexBuffer,
-                   unsigned indexSize,
+                   unsigned indexSize, int indexBias,
                    unsigned mode, unsigned start, unsigned count)
 {
    cell_draw_range_elements( pipe, indexBuffer,
-                             indexSize,
+                             indexSize, indeBias,
                              0, 0xffffffff,
                              mode, start, count );
 }
@@ -131,7 +132,7 @@ static void
 cell_draw_arrays(struct pipe_context *pipe, unsigned mode,
                      unsigned start, unsigned count)
 {
-   cell_draw_elements(pipe, NULL, 0, mode, start, count);
+   cell_draw_elements(pipe, NULL, 0, 0, mode, start, count);
 }
 
 
diff --git a/src/gallium/drivers/failover/fo_context.c b/src/gallium/drivers/failover/fo_context.c
index 325a1009541..236c50f4d98 100644
--- a/src/gallium/drivers/failover/fo_context.c
+++ b/src/gallium/drivers/failover/fo_context.c
@@ -53,6 +53,7 @@ void failover_fail_over( struct failover_context *failover )
 static void failover_draw_elements( struct pipe_context *pipe,
                                     struct pipe_resource *indexResource,
                                     unsigned indexSize,
+                                    int indexBias,
                                     unsigned prim, 
                                     unsigned start, 
                                     unsigned count)
@@ -72,6 +73,7 @@ static void failover_draw_elements( struct pipe_context *pipe,
       failover->hw->draw_elements( failover->hw, 
                                    indexResource, 
                                    indexSize, 
+                                   indexBias,
                                    prim, 
                                    start, 
                                    count );
@@ -89,6 +91,7 @@ static void failover_draw_elements( struct pipe_context *pipe,
       failover->sw->draw_elements( failover->sw, 
 				   indexResource, 
 				   indexSize, 
+				   indexBias,
 				   prim, 
 				   start, 
 				   count );
@@ -105,7 +108,7 @@ static void failover_draw_elements( struct pipe_context *pipe,
 static void failover_draw_arrays( struct pipe_context *pipe,
 				     unsigned prim, unsigned start, unsigned count)
 {
-   failover_draw_elements(pipe, NULL, 0, prim, start, count);
+   failover_draw_elements(pipe, NULL, 0, 0, prim, start, count);
 }
 
 static unsigned int
diff --git a/src/gallium/drivers/i915/i915_context.c b/src/gallium/drivers/i915/i915_context.c
index 12dea9f806c..2af9bdac956 100644
--- a/src/gallium/drivers/i915/i915_context.c
+++ b/src/gallium/drivers/i915/i915_context.c
@@ -48,6 +48,7 @@ static void
 i915_draw_range_elements(struct pipe_context *pipe,
                          struct pipe_resource *indexBuffer,
                          unsigned indexSize,
+                         int indexBias,
                          unsigned min_index,
                          unsigned max_index,
                          unsigned prim, unsigned start, unsigned count)
@@ -72,12 +73,12 @@ i915_draw_range_elements(struct pipe_context *pipe,
     */
    if (indexBuffer) {
       void *mapped_indexes = i915_buffer(indexBuffer)->data;
-      draw_set_mapped_element_buffer_range(draw, indexSize,
+      draw_set_mapped_element_buffer_range(draw, indexSize, indexBias,
                                            min_index,
                                            max_index,
                                            mapped_indexes);
    } else {
-      draw_set_mapped_element_buffer(draw, 0, NULL);
+      draw_set_mapped_element_buffer(draw, 0, 0, NULL);
    }
 
 
@@ -99,18 +100,18 @@ i915_draw_range_elements(struct pipe_context *pipe,
    }
 
    if (indexBuffer) {
-      draw_set_mapped_element_buffer(draw, 0, NULL);
+      draw_set_mapped_element_buffer(draw, 0, 0, NULL);
    }
 }
 
 static void
 i915_draw_elements(struct pipe_context *pipe,
                    struct pipe_resource *indexBuffer,
-                   unsigned indexSize,
+                   unsigned indexSize, int indexBias,
                    unsigned prim, unsigned start, unsigned count)
 {
    i915_draw_range_elements(pipe, indexBuffer,
-                            indexSize,
+                            indexSize, indexBias,
                             0, 0xffffffff,
                             prim, start, count);
 }
@@ -119,7 +120,7 @@ static void
 i915_draw_arrays(struct pipe_context *pipe,
                  unsigned prim, unsigned start, unsigned count)
 {
-   i915_draw_elements(pipe, NULL, 0, prim, start, count);
+   i915_draw_elements(pipe, NULL, 0, 0, prim, start, count);
 }
 
 
diff --git a/src/gallium/drivers/i965/brw_draw.c b/src/gallium/drivers/i965/brw_draw.c
index eb73ec2f272..4625c2048f9 100644
--- a/src/gallium/drivers/i965/brw_draw.c
+++ b/src/gallium/drivers/i965/brw_draw.c
@@ -179,7 +179,7 @@ try_draw_range_elements(struct brw_context *brw,
 static void
 brw_draw_range_elements(struct pipe_context *pipe,
 			struct pipe_resource *index_buffer,
-			unsigned index_size,
+			unsigned index_size, int index_bias,
 			unsigned min_index,
 			unsigned max_index,
 			unsigned mode, unsigned start, unsigned count)
@@ -194,6 +194,8 @@ brw_draw_range_elements(struct pipe_context *pipe,
       debug_printf("PRIM: %s start %d count %d index_buffer %p\n",
                    u_prim_name(mode), start, count, (void *)index_buffer);
 
+   assert(index_bias == 0);
+
    /* Potentially trigger upload of new index buffer.
     *
     * XXX: do we need to go through state validation to achieve this?
@@ -233,12 +235,12 @@ brw_draw_range_elements(struct pipe_context *pipe,
 static void
 brw_draw_elements(struct pipe_context *pipe,
 		  struct pipe_resource *index_buffer,
-		  unsigned index_size,
+		  unsigned index_size, int index_bias,
 		  unsigned mode, 
 		  unsigned start, unsigned count)
 {
    brw_draw_range_elements( pipe, index_buffer,
-                            index_size,
+                            index_size, index_bias,
                             0, 0xffffffff,
                             mode, 
                             start, count );
@@ -248,7 +250,7 @@ static void
 brw_draw_arrays(struct pipe_context *pipe, unsigned mode,
                      unsigned start, unsigned count)
 {
-   brw_draw_elements(pipe, NULL, 0, mode, start, count);
+   brw_draw_elements(pipe, NULL, 0, 0, mode, start, count);
 }
 
 
diff --git a/src/gallium/drivers/identity/id_context.c b/src/gallium/drivers/identity/id_context.c
index 3b7eaecc02f..630cdb5e491 100644
--- a/src/gallium/drivers/identity/id_context.c
+++ b/src/gallium/drivers/identity/id_context.c
@@ -64,6 +64,7 @@ static void
 identity_draw_elements(struct pipe_context *_pipe,
                        struct pipe_resource *_indexResource,
                        unsigned indexSize,
+                       int indexBias,
                        unsigned prim,
                        unsigned start,
                        unsigned count)
@@ -76,6 +77,7 @@ identity_draw_elements(struct pipe_context *_pipe,
    pipe->draw_elements(pipe,
                        indexResource,
                        indexSize,
+                       indexBias,
                        prim,
                        start,
                        count);
@@ -85,6 +87,7 @@ static void
 identity_draw_range_elements(struct pipe_context *_pipe,
                              struct pipe_resource *_indexResource,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned minIndex,
                              unsigned maxIndex,
                              unsigned mode,
@@ -99,6 +102,7 @@ identity_draw_range_elements(struct pipe_context *_pipe,
    pipe->draw_range_elements(pipe,
                              indexResource,
                              indexSize,
+                             indexBias,
                              minIndex,
                              maxIndex,
                              mode,
diff --git a/src/gallium/drivers/llvmpipe/lp_draw_arrays.c b/src/gallium/drivers/llvmpipe/lp_draw_arrays.c
index 86525eea9e9..0b63e1c889e 100644
--- a/src/gallium/drivers/llvmpipe/lp_draw_arrays.c
+++ b/src/gallium/drivers/llvmpipe/lp_draw_arrays.c
@@ -46,7 +46,7 @@ void
 llvmpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
                      unsigned start, unsigned count)
 {
-   llvmpipe_draw_elements(pipe, NULL, 0, mode, start, count);
+   llvmpipe_draw_elements(pipe, NULL, 0, 0, mode, start, count);
 }
 
 
@@ -59,6 +59,7 @@ void
 llvmpipe_draw_range_elements(struct pipe_context *pipe,
                              struct pipe_resource *indexBuffer,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned min_index,
                              unsigned max_index,
                              unsigned mode, unsigned start, unsigned count)
@@ -81,14 +82,14 @@ llvmpipe_draw_range_elements(struct pipe_context *pipe,
    /* Map index buffer, if present */
    if (indexBuffer) {
       void *mapped_indexes = llvmpipe_resource_data(indexBuffer);
-      draw_set_mapped_element_buffer_range(draw, indexSize,
+      draw_set_mapped_element_buffer_range(draw, indexSize, indexBias,
                                            min_index,
                                            max_index,
                                            mapped_indexes);
    }
    else {
       /* no index/element buffer */
-      draw_set_mapped_element_buffer_range(draw, 0, start,
+      draw_set_mapped_element_buffer_range(draw, 0, 0, start,
                                            start + count - 1, NULL);
    }
 
@@ -102,7 +103,7 @@ llvmpipe_draw_range_elements(struct pipe_context *pipe,
       draw_set_mapped_vertex_buffer(draw, i, NULL);
    }
    if (indexBuffer) {
-      draw_set_mapped_element_buffer(draw, 0, NULL);
+      draw_set_mapped_element_buffer(draw, 0, 0, NULL);
    }
 
    /*
@@ -118,10 +119,11 @@ void
 llvmpipe_draw_elements(struct pipe_context *pipe,
                        struct pipe_resource *indexBuffer,
                        unsigned indexSize,
+                       int indexBias,
                        unsigned mode, unsigned start, unsigned count)
 {
    llvmpipe_draw_range_elements( pipe, indexBuffer,
-                                 indexSize,
+                                 indexSize, indexBias,
                                  0, 0xffffffff,
                                  mode, start, count );
 }
diff --git a/src/gallium/drivers/llvmpipe/lp_state.h b/src/gallium/drivers/llvmpipe/lp_state.h
index d89c28a2af2..dcbff190b62 100644
--- a/src/gallium/drivers/llvmpipe/lp_state.h
+++ b/src/gallium/drivers/llvmpipe/lp_state.h
@@ -228,12 +228,12 @@ void llvmpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
 
 void llvmpipe_draw_elements(struct pipe_context *pipe,
 			       struct pipe_resource *indexBuffer,
-			       unsigned indexSize,
+			       unsigned indexSize, int indexBias,
 			       unsigned mode, unsigned start, unsigned count);
 void
 llvmpipe_draw_range_elements(struct pipe_context *pipe,
                              struct pipe_resource *indexBuffer,
-                             unsigned indexSize,
+                             unsigned indexSize, int indexBias,
                              unsigned min_index,
                              unsigned max_index,
                              unsigned mode, unsigned start, unsigned count);
diff --git a/src/gallium/drivers/nv50/nv50_context.h b/src/gallium/drivers/nv50/nv50_context.h
index 8bf465378e3..4875f833054 100644
--- a/src/gallium/drivers/nv50/nv50_context.h
+++ b/src/gallium/drivers/nv50/nv50_context.h
@@ -185,12 +185,12 @@ extern void nv50_draw_arrays_instanced(struct pipe_context *, unsigned mode,
 					unsigned instanceCount);
 extern void nv50_draw_elements(struct pipe_context *pipe,
 				  struct pipe_resource *indexBuffer,
-				  unsigned indexSize,
+				  unsigned indexSize, int indexBias,
 				  unsigned mode, unsigned start,
 				  unsigned count);
 extern void nv50_draw_elements_instanced(struct pipe_context *pipe,
 					 struct pipe_resource *indexBuffer,
-					 unsigned indexSize,
+					 unsigned indexSize, int indexBias,
 					 unsigned mode, unsigned start,
 					 unsigned count,
 					 unsigned startInstance,
diff --git a/src/gallium/drivers/nv50/nv50_push.c b/src/gallium/drivers/nv50/nv50_push.c
index 6981e5b919b..c54fed5a36f 100644
--- a/src/gallium/drivers/nv50/nv50_push.c
+++ b/src/gallium/drivers/nv50/nv50_push.c
@@ -172,7 +172,8 @@ emit_verts(void *priv, unsigned start, unsigned count)
 
 void
 nv50_push_elements_instanced(struct pipe_context *pipe,
-                             struct pipe_resource *idxbuf, unsigned idxsize,
+                             struct pipe_resource *idxbuf,
+                             unsigned idxsize, int idxbias,
                              unsigned mode, unsigned start, unsigned count,
                              unsigned i_start, unsigned i_count)
 {
@@ -269,6 +270,7 @@ nv50_push_elements_instanced(struct pipe_context *pipe,
       }
       ctx.idxbuf = bo->map;
       ctx.idxsize = idxsize;
+      assert(idxbias == 0);
       nouveau_bo_unmap(bo);
    }
 
diff --git a/src/gallium/drivers/nv50/nv50_vbo.c b/src/gallium/drivers/nv50/nv50_vbo.c
index 609145db88a..932c1e89923 100644
--- a/src/gallium/drivers/nv50/nv50_vbo.c
+++ b/src/gallium/drivers/nv50/nv50_vbo.c
@@ -387,7 +387,7 @@ nv50_draw_elements_inline(struct pipe_context *pipe,
 void
 nv50_draw_elements_instanced(struct pipe_context *pipe,
 			     struct pipe_resource *indexBuffer,
-			     unsigned indexSize,
+			     unsigned indexSize, int indexBias,
 			     unsigned mode, unsigned start, unsigned count,
 			     unsigned startInstance, unsigned instanceCount)
 {
@@ -401,6 +401,8 @@ nv50_draw_elements_instanced(struct pipe_context *pipe,
 	if (!nv50_state_validate(nv50, 13 + 16*3))
 		return;
 
+	assert(indexBias == 0);
+
 	if (nv50->vbo_fifo) {
 		nv50_push_elements_instanced(pipe, indexBuffer, indexSize,
 					     mode, start, count, startInstance,
@@ -460,10 +462,11 @@ nv50_draw_elements_instanced(struct pipe_context *pipe,
 
 void
 nv50_draw_elements(struct pipe_context *pipe,
-		   struct pipe_resource *indexBuffer, unsigned indexSize,
+		   struct pipe_resource *indexBuffer,
+		   unsigned indexSize, int indexBias,
 		   unsigned mode, unsigned start, unsigned count)
 {
-	nv50_draw_elements_instanced(pipe, indexBuffer, indexSize,
+	nv50_draw_elements_instanced(pipe, indexBuffer, indexSize, indexBias,
 				     mode, start, count, 0, 1);
 }
 
diff --git a/src/gallium/drivers/nvfx/nvfx_context.h b/src/gallium/drivers/nvfx/nvfx_context.h
index e2c6d09fa19..e48f9f3aa88 100644
--- a/src/gallium/drivers/nvfx/nvfx_context.h
+++ b/src/gallium/drivers/nvfx/nvfx_context.h
@@ -175,9 +175,10 @@ extern void nvfx_clear(struct pipe_context *pipe, unsigned buffers,
 /* nvfx_draw.c */
 extern struct draw_stage *nvfx_draw_render_stage(struct nvfx_context *nvfx);
 extern void nvfx_draw_elements_swtnl(struct pipe_context *pipe,
-					struct pipe_resource *idxbuf,
-					unsigned ib_size, unsigned mode,
-					unsigned start, unsigned count);
+                                     struct pipe_resource *idxbuf,
+                                     unsigned ib_size, int ib_bias,
+                                     unsigned mode,
+                                     unsigned start, unsigned count);
 extern void nvfx_vtxfmt_validate(struct nvfx_context *nvfx);
 
 /* nvfx_fb.c */
@@ -237,10 +238,10 @@ extern void nvfx_vbo_relocate(struct nvfx_context *nvfx);
 extern void nvfx_draw_arrays(struct pipe_context *, unsigned mode,
 				unsigned start, unsigned count);
 extern void nvfx_draw_elements(struct pipe_context *pipe,
-				  struct pipe_resource *indexBuffer,
-				  unsigned indexSize,
-				  unsigned mode, unsigned start,
-				  unsigned count);
+                               struct pipe_resource *indexBuffer,
+                               unsigned indexSize, int indexBias,
+                               unsigned mode, unsigned start,
+                               unsigned count);
 
 /* nvfx_vertprog.c */
 extern boolean nvfx_vertprog_validate(struct nvfx_context *nvfx);
diff --git a/src/gallium/drivers/nvfx/nvfx_draw.c b/src/gallium/drivers/nvfx/nvfx_draw.c
index 5eadce1f6d4..55b72aced02 100644
--- a/src/gallium/drivers/nvfx/nvfx_draw.c
+++ b/src/gallium/drivers/nvfx/nvfx_draw.c
@@ -232,7 +232,8 @@ nvfx_draw_render_stage(struct nvfx_context *nvfx)
 
 void
 nvfx_draw_elements_swtnl(struct pipe_context *pipe,
-			 struct pipe_resource *idxbuf, unsigned idxbuf_size,
+			 struct pipe_resource *idxbuf,
+			 unsigned idxbuf_size, int idxbuf_bias,
 			 unsigned mode, unsigned start, unsigned count)
 {
 	struct nvfx_context *nvfx = nvfx_context(pipe);
@@ -257,9 +258,9 @@ nvfx_draw_elements_swtnl(struct pipe_context *pipe,
 		map = pipe_buffer_map(pipe, idxbuf,
 				      PIPE_TRANSFER_READ,
 				      &ib_transfer);
-		draw_set_mapped_element_buffer(nvfx->draw, idxbuf_size, map);
+		draw_set_mapped_element_buffer(nvfx->draw, idxbuf_size, idx_bufbias, map);
 	} else {
-		draw_set_mapped_element_buffer(nvfx->draw, 0, NULL);
+		draw_set_mapped_element_buffer(nvfx->draw, 0, 0, NULL);
 	}
 
 	if (nvfx->constbuf[PIPE_SHADER_VERTEX]) {
diff --git a/src/gallium/drivers/nvfx/nvfx_vbo.c b/src/gallium/drivers/nvfx/nvfx_vbo.c
index b8e94885f04..4d7b7f181d8 100644
--- a/src/gallium/drivers/nvfx/nvfx_vbo.c
+++ b/src/gallium/drivers/nvfx/nvfx_vbo.c
@@ -168,7 +168,7 @@ nvfx_draw_arrays(struct pipe_context *pipe,
 
 	nvfx_vbo_set_idxbuf(nvfx, NULL, 0);
 	if (nvfx->screen->force_swtnl || !nvfx_state_validate(nvfx)) {
-		nvfx_draw_elements_swtnl(pipe, NULL, 0,
+		nvfx_draw_elements_swtnl(pipe, NULL, 0, 0,
                                            mode, start, count);
                 return;
 	}
@@ -373,7 +373,8 @@ nvfx_draw_elements_u32(struct nvfx_context *nvfx, void *ib,
 
 static void
 nvfx_draw_elements_inline(struct pipe_context *pipe,
-			  struct pipe_resource *ib, unsigned ib_size,
+			  struct pipe_resource *ib,
+			  unsigned ib_size, int ib_bias,
 			  unsigned mode, unsigned start, unsigned count)
 {
 	struct nvfx_context *nvfx = nvfx_context(pipe);
@@ -386,6 +387,8 @@ nvfx_draw_elements_inline(struct pipe_context *pipe,
 		return;
 	}
 
+	assert(ib_bias == 0);
+
 	switch (ib_size) {
 	case 1:
 		nvfx_draw_elements_u08(nvfx, map, mode, start, count);
@@ -461,7 +464,8 @@ nvfx_draw_elements_vbo(struct pipe_context *pipe,
 
 void
 nvfx_draw_elements(struct pipe_context *pipe,
-		   struct pipe_resource *indexBuffer, unsigned indexSize,
+		   struct pipe_resource *indexBuffer,
+		   unsigned indexSize, int indexBias,
 		   unsigned mode, unsigned start, unsigned count)
 {
 	struct nvfx_context *nvfx = nvfx_context(pipe);
@@ -469,15 +473,17 @@ nvfx_draw_elements(struct pipe_context *pipe,
 
 	idxbuf = nvfx_vbo_set_idxbuf(nvfx, indexBuffer, indexSize);
 	if (nvfx->screen->force_swtnl || !nvfx_state_validate(nvfx)) {
-		nvfx_draw_elements_swtnl(pipe, indexBuffer, indexSize,
-                                           mode, start, count);
+		nvfx_draw_elements_swtnl(pipe,
+		                         indexBuffer, indexSize, indexBias,
+		                         mode, start, count);
 		return;
 	}
 
 	if (idxbuf) {
 		nvfx_draw_elements_vbo(pipe, mode, start, count);
 	} else {
-		nvfx_draw_elements_inline(pipe, indexBuffer, indexSize,
+		nvfx_draw_elements_inline(pipe,
+		                          indexBuffer, indexSize, indexBias,
 					  mode, start, count);
 	}
 
diff --git a/src/gallium/drivers/r300/r300_context.h b/src/gallium/drivers/r300/r300_context.h
index 2e8601b65ef..1e4fd9e5edd 100644
--- a/src/gallium/drivers/r300/r300_context.h
+++ b/src/gallium/drivers/r300/r300_context.h
@@ -327,7 +327,8 @@ struct r300_context {
 
     void (*emit_draw_elements)(
             struct r300_context *r300, struct pipe_resource* indexBuffer,
-            unsigned indexSize, unsigned minIndex, unsigned maxIndex,
+            unsigned indexSize, int indexBias,
+            unsigned minIndex, unsigned maxIndex,
             unsigned mode, unsigned start, unsigned count);
 
 
diff --git a/src/gallium/drivers/r300/r300_render.c b/src/gallium/drivers/r300/r300_render.c
index a3fd8cc67d8..23b61df89cc 100644
--- a/src/gallium/drivers/r300/r300_render.c
+++ b/src/gallium/drivers/r300/r300_render.c
@@ -298,6 +298,7 @@ void r500_emit_draw_arrays(struct r300_context *r300,
 void r500_emit_draw_elements(struct r300_context *r300,
                              struct pipe_resource* indexBuffer,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned minIndex,
                              unsigned maxIndex,
                              unsigned mode,
@@ -319,6 +320,8 @@ void r500_emit_draw_elements(struct r300_context *r300,
         return;
     }
 
+    assert(indexBias == 0);
+
     maxIndex = MIN2(maxIndex, r300->vertex_buffer_max_index);
 
     DBG(r300, DBG_DRAW, "r300: Indexbuf of %u indices, min %u max %u\n",
@@ -442,6 +445,7 @@ void r300_emit_draw_arrays(struct r300_context *r300,
 void r300_emit_draw_elements(struct r300_context *r300,
                              struct pipe_resource* indexBuffer,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned minIndex,
                              unsigned maxIndex,
                              unsigned mode,
@@ -449,15 +453,15 @@ void r300_emit_draw_elements(struct r300_context *r300,
                              unsigned count)
 {
     if (!r300->stencil_ref_bf_fallback) {
-        r500_emit_draw_elements(r300, indexBuffer, indexSize, minIndex,
-                                maxIndex, mode, start, count);
+        r500_emit_draw_elements(r300, indexBuffer, indexSize, indexBias,
+                                minIndex, maxIndex, mode, start, count);
     } else {
         r300_begin_stencil_ref_fallback(r300);
-        r500_emit_draw_elements(r300, indexBuffer, indexSize, minIndex,
-                                maxIndex, mode, start, count);
+        r500_emit_draw_elements(r300, indexBuffer, indexSize, indexBias,
+                                minIndex, maxIndex, mode, start, count);
         r300_switch_stencil_ref_side(r300);
-        r500_emit_draw_elements(r300, indexBuffer, indexSize, minIndex,
-                                maxIndex, mode, start, count);
+        r500_emit_draw_elements(r300, indexBuffer, indexSize, indexBias,
+                                minIndex, maxIndex, mode, start, count);
         r300_end_stencil_ref_fallback(r300);
     }
 }
@@ -528,6 +532,7 @@ static void r300_align_ushort_elts(struct r300_context *r300,
 void r300_draw_range_elements(struct pipe_context* pipe,
                               struct pipe_resource* indexBuffer,
                               unsigned indexSize,
+                              int indexBias,
                               unsigned minIndex,
                               unsigned maxIndex,
                               unsigned mode,
@@ -574,13 +579,14 @@ void r300_draw_range_elements(struct pipe_context* pipe,
     u_upload_flush(r300->upload_vb);
     u_upload_flush(r300->upload_ib);
     if (alt_num_verts || count <= 65535) {
-        r300->emit_draw_elements(r300, indexBuffer, indexSize, minIndex,
-                                 maxIndex, mode, start, count);
+        r300->emit_draw_elements(r300, indexBuffer, indexSize, indexBias,
+                                 minIndex, maxIndex, mode, start, count);
     } else {
         do {
             short_count = MIN2(count, 65534);
-            r300->emit_draw_elements(r300, indexBuffer, indexSize, minIndex,
-                                      maxIndex, mode, start, short_count);
+            r300->emit_draw_elements(r300, indexBuffer, indexSize, indexBias,
+                                     minIndex, maxIndex,
+                                     mode, start, short_count);
 
             start += short_count;
             count -= short_count;
@@ -602,13 +608,13 @@ void r300_draw_range_elements(struct pipe_context* pipe,
 /* Simple helpers for context setup. Should probably be moved to util. */
 void r300_draw_elements(struct pipe_context* pipe,
                         struct pipe_resource* indexBuffer,
-                        unsigned indexSize, unsigned mode,
+                        unsigned indexSize, int indexBias, unsigned mode,
                         unsigned start, unsigned count)
 {
     struct r300_context *r300 = r300_context(pipe);
 
-    pipe->draw_range_elements(pipe, indexBuffer, indexSize, 0,
-                              r300->vertex_buffer_max_index,
+    pipe->draw_range_elements(pipe, indexBuffer, indexSize, indexBias,
+                              0, r300->vertex_buffer_max_index,
                               mode, start, count);
 }
 
@@ -698,7 +704,7 @@ void r300_swtcl_draw_arrays(struct pipe_context* pipe,
         draw_set_mapped_vertex_buffer(r300->draw, i, buf);
     }
 
-    draw_set_mapped_element_buffer(r300->draw, 0, NULL);
+    draw_set_mapped_element_buffer(r300->draw, 0, 0, NULL);
 
     draw_arrays(r300->draw, mode, start, count);
 
@@ -713,6 +719,7 @@ void r300_swtcl_draw_arrays(struct pipe_context* pipe,
 void r300_swtcl_draw_range_elements(struct pipe_context* pipe,
                                        struct pipe_resource* indexBuffer,
                                        unsigned indexSize,
+                                       int indexBias,
                                        unsigned minIndex,
                                        unsigned maxIndex,
                                        unsigned mode,
@@ -743,7 +750,7 @@ void r300_swtcl_draw_range_elements(struct pipe_context* pipe,
 
     indices = pipe_buffer_map(pipe, indexBuffer,
                               PIPE_TRANSFER_READ, &ib_transfer);
-    draw_set_mapped_element_buffer_range(r300->draw, indexSize,
+    draw_set_mapped_element_buffer_range(r300->draw, indexSize, indexBias,
                                          minIndex, maxIndex, indices);
 
     draw_arrays(r300->draw, mode, start, count);
@@ -756,8 +763,9 @@ void r300_swtcl_draw_range_elements(struct pipe_context* pipe,
 
     pipe_buffer_unmap(pipe, indexBuffer,
 		      ib_transfer);
-    draw_set_mapped_element_buffer_range(r300->draw, 0, start,
-                                         start + count - 1, NULL);
+    draw_set_mapped_element_buffer_range(r300->draw, 0, 0,
+                                         start, start + count - 1,
+                                         NULL);
 }
 
 /* Object for rendering using Draw. */
diff --git a/src/gallium/drivers/r300/r300_render.h b/src/gallium/drivers/r300/r300_render.h
index 85da6135f58..4e78914c1ba 100644
--- a/src/gallium/drivers/r300/r300_render.h
+++ b/src/gallium/drivers/r300/r300_render.h
@@ -35,6 +35,7 @@ void r500_emit_draw_arrays(struct r300_context *r300,
 void r500_emit_draw_elements(struct r300_context *r300,
                              struct pipe_resource* indexBuffer,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned minIndex,
                              unsigned maxIndex,
                              unsigned mode,
@@ -53,6 +54,7 @@ void r300_emit_draw_arrays(struct r300_context *r300,
 void r300_emit_draw_elements(struct r300_context *r300,
                              struct pipe_resource* indexBuffer,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned minIndex,
                              unsigned maxIndex,
                              unsigned mode,
@@ -62,6 +64,7 @@ void r300_emit_draw_elements(struct r300_context *r300,
 void r300_draw_range_elements(struct pipe_context* pipe,
                               struct pipe_resource* indexBuffer,
                               unsigned indexSize,
+                              int indexBias,
                               unsigned minIndex,
                               unsigned maxIndex,
                               unsigned mode,
@@ -70,7 +73,7 @@ void r300_draw_range_elements(struct pipe_context* pipe,
 
 void r300_draw_elements(struct pipe_context* pipe,
                         struct pipe_resource* indexBuffer,
-                        unsigned indexSize, unsigned mode,
+                        unsigned indexSize, int indexBias, unsigned mode,
                         unsigned start, unsigned count);
 
 void r300_draw_arrays(struct pipe_context* pipe, unsigned mode,
@@ -84,6 +87,7 @@ void r300_swtcl_draw_arrays(struct pipe_context* pipe,
 void r300_swtcl_draw_range_elements(struct pipe_context* pipe,
                                     struct pipe_resource* indexBuffer,
                                     unsigned indexSize,
+                                    int indexBias,
                                     unsigned minIndex,
                                     unsigned maxIndex,
                                     unsigned mode,
diff --git a/src/gallium/drivers/softpipe/sp_draw_arrays.c b/src/gallium/drivers/softpipe/sp_draw_arrays.c
index 461c9a6c4d4..b30036e2303 100644
--- a/src/gallium/drivers/softpipe/sp_draw_arrays.c
+++ b/src/gallium/drivers/softpipe/sp_draw_arrays.c
@@ -57,6 +57,7 @@ static void
 softpipe_draw_range_elements_instanced(struct pipe_context *pipe,
                                        struct pipe_resource *indexBuffer,
                                        unsigned indexSize,
+                                       int indexBias,
                                        unsigned minIndex,
                                        unsigned maxIndex,
                                        unsigned mode,
@@ -74,6 +75,7 @@ softpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
                                           NULL,
                                           0,
                                           0,
+                                          0,
                                           0xffffffff,
                                           mode,
                                           start,
@@ -87,6 +89,7 @@ void
 softpipe_draw_range_elements(struct pipe_context *pipe,
                              struct pipe_resource *indexBuffer,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned min_index,
                              unsigned max_index,
                              unsigned mode, unsigned start, unsigned count)
@@ -94,6 +97,7 @@ softpipe_draw_range_elements(struct pipe_context *pipe,
    softpipe_draw_range_elements_instanced(pipe,
                                           indexBuffer,
                                           indexSize,
+                                          indexBias,
                                           min_index,
                                           max_index,
                                           mode,
@@ -107,12 +111,13 @@ softpipe_draw_range_elements(struct pipe_context *pipe,
 void
 softpipe_draw_elements(struct pipe_context *pipe,
                        struct pipe_resource *indexBuffer,
-                       unsigned indexSize,
+                       unsigned indexSize, int indexBias,
                        unsigned mode, unsigned start, unsigned count)
 {
    softpipe_draw_range_elements_instanced(pipe,
                                           indexBuffer,
                                           indexSize,
+                                          indexBias,
                                           0,
                                           0xffffffff,
                                           mode,
@@ -134,6 +139,7 @@ softpipe_draw_arrays_instanced(struct pipe_context *pipe,
                                           NULL,
                                           0,
                                           0,
+                                          0,
                                           0xffffffff,
                                           mode,
                                           start,
@@ -146,6 +152,7 @@ void
 softpipe_draw_elements_instanced(struct pipe_context *pipe,
                                  struct pipe_resource *indexBuffer,
                                  unsigned indexSize,
+                                 int indexBias,
                                  unsigned mode,
                                  unsigned start,
                                  unsigned count,
@@ -155,6 +162,7 @@ softpipe_draw_elements_instanced(struct pipe_context *pipe,
    softpipe_draw_range_elements_instanced(pipe,
                                           indexBuffer,
                                           indexSize,
+                                          indexBias,
                                           0,
                                           0xffffffff,
                                           mode,
@@ -168,6 +176,7 @@ static void
 softpipe_draw_range_elements_instanced(struct pipe_context *pipe,
                                        struct pipe_resource *indexBuffer,
                                        unsigned indexSize,
+                                       int indexBias,
                                        unsigned minIndex,
                                        unsigned maxIndex,
                                        unsigned mode,
@@ -202,13 +211,14 @@ softpipe_draw_range_elements_instanced(struct pipe_context *pipe,
       void *mapped_indexes = softpipe_resource(indexBuffer)->data;
       draw_set_mapped_element_buffer_range(draw,
                                            indexSize,
+                                           indexBias,
                                            minIndex,
                                            maxIndex,
                                            mapped_indexes);
    } else {
       /* no index/element buffer */
       draw_set_mapped_element_buffer_range(draw,
-                                           0,
+                                           0, 0,
                                            start,
                                            start + count - 1,
                                            NULL);
@@ -222,7 +232,7 @@ softpipe_draw_range_elements_instanced(struct pipe_context *pipe,
       draw_set_mapped_vertex_buffer(draw, i, NULL);
    }
    if (indexBuffer) {
-      draw_set_mapped_element_buffer(draw, 0, NULL);
+      draw_set_mapped_element_buffer(draw, 0, 0, NULL);
    }
 
    /*
diff --git a/src/gallium/drivers/softpipe/sp_state.h b/src/gallium/drivers/softpipe/sp_state.h
index 3c04c8bb07e..f97fc6eca8f 100644
--- a/src/gallium/drivers/softpipe/sp_state.h
+++ b/src/gallium/drivers/softpipe/sp_state.h
@@ -211,12 +211,13 @@ void softpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
 
 void softpipe_draw_elements(struct pipe_context *pipe,
                             struct pipe_resource *indexBuffer,
-                            unsigned indexSize,
+                            unsigned indexSize, int indexBias,
                             unsigned mode, unsigned start, unsigned count);
 void
 softpipe_draw_range_elements(struct pipe_context *pipe,
                              struct pipe_resource *indexBuffer,
                              unsigned indexSize,
+                             int indexBias,
                              unsigned min_index,
                              unsigned max_index,
                              unsigned mode, unsigned start, unsigned count);
@@ -233,6 +234,7 @@ void
 softpipe_draw_elements_instanced(struct pipe_context *pipe,
                                  struct pipe_resource *indexBuffer,
                                  unsigned indexSize,
+                                 int indexBias,
                                  unsigned mode,
                                  unsigned start,
                                  unsigned count,
diff --git a/src/gallium/drivers/svga/svga_draw.h b/src/gallium/drivers/svga/svga_draw.h
index 81c7f8377de..a2403d802be 100644
--- a/src/gallium/drivers/svga/svga_draw.h
+++ b/src/gallium/drivers/svga/svga_draw.h
@@ -69,12 +69,12 @@ enum pipe_error
 svga_hwtnl_draw_range_elements( struct svga_hwtnl *hwtnl,
                                 struct pipe_resource *indexBuffer,
                                 unsigned index_size,
+                                int index_bias,
                                 unsigned min_index,
                                 unsigned max_index,
                                 unsigned prim, 
                                 unsigned start, 
-                                unsigned count,
-                                unsigned bias );
+                                unsigned count );
 
 enum pipe_error
 svga_hwtnl_flush( struct svga_hwtnl *hwtnl );
diff --git a/src/gallium/drivers/svga/svga_draw_elements.c b/src/gallium/drivers/svga/svga_draw_elements.c
index 7ec4a058fc7..c4579177b77 100644
--- a/src/gallium/drivers/svga/svga_draw_elements.c
+++ b/src/gallium/drivers/svga/svga_draw_elements.c
@@ -99,12 +99,12 @@ enum pipe_error
 svga_hwtnl_simple_draw_range_elements( struct svga_hwtnl *hwtnl,
                                        struct pipe_resource *index_buffer,
                                        unsigned index_size,
+                                       int index_bias,
                                        unsigned min_index,
                                        unsigned max_index,
                                        unsigned prim, 
                                        unsigned start,
-                                       unsigned count,
-                                       unsigned bias )
+                                       unsigned count )
 {
    struct pipe_resource *upload_buffer = NULL;
    SVGA3dPrimitiveRange range;
@@ -143,7 +143,7 @@ svga_hwtnl_simple_draw_range_elements( struct svga_hwtnl *hwtnl,
    range.indexArray.offset = index_offset;
    range.indexArray.stride = index_size;
    range.indexWidth = index_size;
-   range.indexBias = bias;
+   range.indexBias = index_bias;
       
    ret = svga_hwtnl_prim( hwtnl, &range, min_index, max_index, index_buffer );
    if (ret)
@@ -163,10 +163,10 @@ enum pipe_error
 svga_hwtnl_draw_range_elements( struct svga_hwtnl *hwtnl,
                                 struct pipe_resource *index_buffer,
                                 unsigned index_size,
+                                int index_bias,
                                 unsigned min_index,
                                 unsigned max_index,
-                                unsigned prim, unsigned start, unsigned count,
-                                unsigned bias)
+                                unsigned prim, unsigned start, unsigned count)
 {
    unsigned gen_prim, gen_size, gen_nr, gen_type;
    u_translate_func gen_func;
@@ -204,9 +204,10 @@ svga_hwtnl_draw_range_elements( struct svga_hwtnl *hwtnl,
        */
       return svga_hwtnl_simple_draw_range_elements( hwtnl, index_buffer,
                                                     index_size,
+                                                    index_bias,
                                                     min_index,
                                                     max_index,
-                                                    gen_prim, start, count, bias );
+                                                    gen_prim, start, count );
    }
    else {
       struct pipe_resource *gen_buf = NULL;
@@ -231,12 +232,12 @@ svga_hwtnl_draw_range_elements( struct svga_hwtnl *hwtnl,
       ret = svga_hwtnl_simple_draw_range_elements( hwtnl,
                                                    gen_buf,
                                                    gen_size,
+                                                   index_bias,
                                                    min_index,
                                                    max_index,
                                                    gen_prim,
                                                    0,
-                                                   gen_nr,
-                                                   bias );
+                                                   gen_nr );
       if (ret)
          goto done;
 
diff --git a/src/gallium/drivers/svga/svga_draw_private.h b/src/gallium/drivers/svga/svga_draw_private.h
index b6fcd6854c5..11afb59875b 100644
--- a/src/gallium/drivers/svga/svga_draw_private.h
+++ b/src/gallium/drivers/svga/svga_draw_private.h
@@ -147,12 +147,12 @@ enum pipe_error
 svga_hwtnl_simple_draw_range_elements( struct svga_hwtnl *hwtnl,
                                        struct pipe_resource *indexBuffer,
                                        unsigned index_size,
+                                       int index_bias,
                                        unsigned min_index,
                                        unsigned max_index,
                                        unsigned prim, 
                                        unsigned start,
-                                       unsigned count,
-                                       unsigned bias );
+                                       unsigned count );
 
 
 #endif
diff --git a/src/gallium/drivers/svga/svga_pipe_draw.c b/src/gallium/drivers/svga/svga_pipe_draw.c
index a05272b2e40..58e930d9835 100644
--- a/src/gallium/drivers/svga/svga_pipe_draw.c
+++ b/src/gallium/drivers/svga/svga_pipe_draw.c
@@ -44,6 +44,7 @@ static enum pipe_error
 retry_draw_range_elements( struct svga_context *svga,
                            struct pipe_resource *index_buffer,
                            unsigned index_size,
+                           int index_bias,
                            unsigned min_index,
                            unsigned max_index,
                            unsigned prim, 
@@ -66,9 +67,9 @@ retry_draw_range_elements( struct svga_context *svga,
       goto retry;
 
    ret = svga_hwtnl_draw_range_elements( svga->hwtnl,
-                                         index_buffer, index_size,
+                                         index_buffer, index_size, index_bias,
                                          min_index, max_index,
-                                         prim, start, count, 0 );
+                                         prim, start, count );
    if (ret)
       goto retry;
 
@@ -86,7 +87,7 @@ retry:
    if (do_retry)
    {
       return retry_draw_range_elements( svga,
-                                        index_buffer, index_size,
+                                        index_buffer, index_size, index_bias,
                                         min_index, max_index,
                                         prim, start, count,
                                         FALSE );
@@ -152,6 +153,7 @@ static void
 svga_draw_range_elements( struct pipe_context *pipe,
                           struct pipe_resource *index_buffer,
                           unsigned index_size,
+                          int index_bias,
                           unsigned min_index,
                           unsigned max_index,
                           unsigned prim, unsigned start, unsigned count)
@@ -190,6 +192,7 @@ svga_draw_range_elements( struct pipe_context *pipe,
       ret = svga_swtnl_draw_range_elements( svga, 
                                             index_buffer, 
                                             index_size,
+                                            index_bias,
                                             min_index, max_index,
                                             prim,
                                             start, count );
@@ -199,6 +202,7 @@ svga_draw_range_elements( struct pipe_context *pipe,
          ret = retry_draw_range_elements( svga,
                                           index_buffer,
                                           index_size,
+                                          index_bias,
                                           min_index,
                                           max_index,
                                           prim,
@@ -225,11 +229,11 @@ svga_draw_range_elements( struct pipe_context *pipe,
 static void
 svga_draw_elements( struct pipe_context *pipe,
                     struct pipe_resource *index_buffer,
-                    unsigned index_size,
+                    unsigned index_size, int index_bias,
                     unsigned prim, unsigned start, unsigned count)
 {
    svga_draw_range_elements( pipe, index_buffer,
-                             index_size,
+                             index_size, index_bias,
                              0, 0xffffffff,
                              prim, start, count );
 }
@@ -238,7 +242,7 @@ static void
 svga_draw_arrays( struct pipe_context *pipe,
                   unsigned prim, unsigned start, unsigned count)
 {
-   svga_draw_range_elements(pipe, NULL, 0, 
+   svga_draw_range_elements(pipe, NULL, 0, 0,
                             start, start + count - 1, 
                             prim, 
                             start, count);
diff --git a/src/gallium/drivers/svga/svga_swtnl.h b/src/gallium/drivers/svga/svga_swtnl.h
index 096ed410b5b..8724690f7e1 100644
--- a/src/gallium/drivers/svga/svga_swtnl.h
+++ b/src/gallium/drivers/svga/svga_swtnl.h
@@ -42,6 +42,7 @@ enum pipe_error
 svga_swtnl_draw_range_elements(struct svga_context *svga,
                                struct pipe_resource *indexBuffer,
                                unsigned indexSize,
+                               int indexBias,
                                unsigned min_index,
                                unsigned max_index,
                                unsigned prim, 
diff --git a/src/gallium/drivers/svga/svga_swtnl_backend.c b/src/gallium/drivers/svga/svga_swtnl_backend.c
index e6498136083..b0cbead8a5c 100644
--- a/src/gallium/drivers/svga/svga_swtnl_backend.c
+++ b/src/gallium/drivers/svga/svga_swtnl_backend.c
@@ -247,7 +247,7 @@ svga_vbuf_render_draw( struct vbuf_render *render,
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    struct svga_context *svga = svga_render->svga;
    struct pipe_screen *screen = svga->pipe.screen;
-   unsigned bias = (svga_render->vbuf_offset - svga_render->vdecl_offset) / svga_render->vertex_size;
+   int bias = (svga_render->vbuf_offset - svga_render->vdecl_offset) / svga_render->vertex_size;
    boolean ret;
    size_t size = 2 * nr_indices;
 
@@ -280,19 +280,21 @@ svga_vbuf_render_draw( struct vbuf_render *render,
    ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
                                         svga_render->ibuf,
                                         2,
+                                        bias,
                                         svga_render->min_index,
                                         svga_render->max_index,
                                         svga_render->prim,
-                                        svga_render->ibuf_offset / 2, nr_indices, bias);
+                                        svga_render->ibuf_offset / 2, nr_indices);
    if(ret != PIPE_OK) {
       svga_context_flush(svga, NULL);
       ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
                                            svga_render->ibuf,
                                            2,
+                                           bias,
                                            svga_render->min_index,
                                            svga_render->max_index,
                                            svga_render->prim,
-                                           svga_render->ibuf_offset / 2, nr_indices, bias);
+                                           svga_render->ibuf_offset / 2, nr_indices);
       svga->swtnl.new_vbuf = TRUE;
       assert(ret == PIPE_OK);
    }
diff --git a/src/gallium/drivers/svga/svga_swtnl_draw.c b/src/gallium/drivers/svga/svga_swtnl_draw.c
index 0981d85929f..eb71c23195b 100644
--- a/src/gallium/drivers/svga/svga_swtnl_draw.c
+++ b/src/gallium/drivers/svga/svga_swtnl_draw.c
@@ -39,6 +39,7 @@ enum pipe_error
 svga_swtnl_draw_range_elements(struct svga_context *svga,
                                struct pipe_resource *indexBuffer,
                                unsigned indexSize,
+                               int indexBias,
                                unsigned min_index,
                                unsigned max_index,
                                unsigned prim, unsigned start, unsigned count)
@@ -82,7 +83,7 @@ svga_swtnl_draw_range_elements(struct svga_context *svga,
 			    &ib_transfer);
 
       draw_set_mapped_element_buffer_range(draw, 
-                                           indexSize, 
+                                           indexSize, indexBias,
                                            min_index,
                                            max_index,
                                            map);
@@ -118,7 +119,7 @@ svga_swtnl_draw_range_elements(struct svga_context *svga,
 
    if (indexBuffer) {
       pipe_buffer_unmap(&svga->pipe, indexBuffer, ib_transfer);
-      draw_set_mapped_element_buffer(draw, 0, NULL);
+      draw_set_mapped_element_buffer(draw, 0, 0, NULL);
    }
 
    if (svga->curr.cb[PIPE_SHADER_VERTEX]) {
diff --git a/src/gallium/drivers/trace/tr_context.c b/src/gallium/drivers/trace/tr_context.c
index 512acb7d13c..8216c06260f 100644
--- a/src/gallium/drivers/trace/tr_context.c
+++ b/src/gallium/drivers/trace/tr_context.c
@@ -176,9 +176,9 @@ trace_context_draw_arrays(struct pipe_context *_pipe,
 
 static INLINE void
 trace_context_draw_elements(struct pipe_context *_pipe,
-                          struct pipe_resource *_indexBuffer,
-                          unsigned indexSize,
-                          unsigned mode, unsigned start, unsigned count)
+                            struct pipe_resource *_indexBuffer,
+                            unsigned indexSize, int indexBias,
+                            unsigned mode, unsigned start, unsigned count)
 {
    struct trace_context *tr_ctx = trace_context(_pipe);
    struct trace_resource *tr_buf = trace_resource(_indexBuffer);
@@ -195,11 +195,13 @@ trace_context_draw_elements(struct pipe_context *_pipe,
    trace_dump_arg(ptr, pipe);
    trace_dump_arg(ptr, indexBuffer);
    trace_dump_arg(uint, indexSize);
+   trace_dump_arg(int, indexBias);
    trace_dump_arg(uint, mode);
    trace_dump_arg(uint, start);
    trace_dump_arg(uint, count);
 
-   pipe->draw_elements(pipe, indexBuffer, indexSize, mode, start, count);
+   pipe->draw_elements(pipe, indexBuffer, indexSize, indexBias,
+                       mode, start, count);
 
    trace_dump_call_end();
 
@@ -211,6 +213,7 @@ static INLINE void
 trace_context_draw_range_elements(struct pipe_context *_pipe,
                                   struct pipe_resource *_indexBuffer,
                                   unsigned indexSize,
+                                  int indexBias,
                                   unsigned minIndex,
                                   unsigned maxIndex,
                                   unsigned mode,
@@ -232,6 +235,7 @@ trace_context_draw_range_elements(struct pipe_context *_pipe,
    trace_dump_arg(ptr, pipe);
    trace_dump_arg(ptr, indexBuffer);
    trace_dump_arg(uint, indexSize);
+   trace_dump_arg(int, indexBias);
    trace_dump_arg(uint, minIndex);
    trace_dump_arg(uint, maxIndex);
    trace_dump_arg(uint, mode);
@@ -239,8 +243,8 @@ trace_context_draw_range_elements(struct pipe_context *_pipe,
    trace_dump_arg(uint, count);
 
    pipe->draw_range_elements(pipe,
-                             indexBuffer,
-                             indexSize, minIndex, maxIndex,
+                             indexBuffer, indexSize, indexBias,
+                             minIndex, maxIndex,
                              mode, start, count);
 
    trace_dump_call_end();
diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 1aa0cbe4dca..6f47845f3b8 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -67,6 +67,7 @@ struct pipe_context {
    void (*draw_elements)( struct pipe_context *pipe,
                           struct pipe_resource *indexBuffer,
                           unsigned indexSize,
+                          int indexBias,
                           unsigned mode, unsigned start, unsigned count);
 
    void (*draw_arrays_instanced)(struct pipe_context *pipe,
@@ -79,6 +80,7 @@ struct pipe_context {
    void (*draw_elements_instanced)(struct pipe_context *pipe,
                                    struct pipe_resource *indexBuffer,
                                    unsigned indexSize,
+                                   int indexBias,
                                    unsigned mode,
                                    unsigned start,
                                    unsigned count,
@@ -93,6 +95,7 @@ struct pipe_context {
    void (*draw_range_elements)( struct pipe_context *pipe,
                                 struct pipe_resource *indexBuffer,
                                 unsigned indexSize,
+                                int indexBias,
                                 unsigned minIndex,
                                 unsigned maxIndex,
                                 unsigned mode, 
diff --git a/src/gallium/state_trackers/python/p_context.i b/src/gallium/state_trackers/python/p_context.i
index 13c8d1a95e9..3c5509cb5e4 100644
--- a/src/gallium/state_trackers/python/p_context.i
+++ b/src/gallium/state_trackers/python/p_context.i
@@ -312,22 +312,24 @@ struct st_context {
    }
 
    void draw_elements( struct pipe_resource *indexBuffer,
-                       unsigned indexSize,
+                       unsigned indexSize, int indexBias,
                        unsigned mode, unsigned start, unsigned count) 
    {
       $self->pipe->draw_elements($self->pipe, 
                                  indexBuffer, 
                                  indexSize, 
+                                 indexBias,
                                  mode, start, count);
    }
 
    void draw_range_elements( struct pipe_resource *indexBuffer,
-                             unsigned indexSize, unsigned minIndex, unsigned maxIndex,
+                             unsigned indexSize, int indexBias,
+                             unsigned minIndex, unsigned maxIndex,
                              unsigned mode, unsigned start, unsigned count)
    {
       $self->pipe->draw_range_elements($self->pipe, 
-                                       indexBuffer, 
-                                       indexSize, minIndex, maxIndex,
+                                       indexBuffer, indexSize, indexBias,
+                                       minIndex, maxIndex,
                                        mode, start, count);
    }
 
diff --git a/src/gallium/tests/python/retrace/interpreter.py b/src/gallium/tests/python/retrace/interpreter.py
index 88b3bbd143b..7118ff85ed8 100755
--- a/src/gallium/tests/python/retrace/interpreter.py
+++ b/src/gallium/tests/python/retrace/interpreter.py
@@ -496,7 +496,7 @@ class Context(Object):
             sys.stdout.write('\t},\n')
         sys.stdout.flush()
 
-    def dump_indices(self, ibuf, isize, start, count):
+    def dump_indices(self, ibuf, isize, ibias, start, count):
         if not self.interpreter.verbosity(2):
             return
 
@@ -524,7 +524,7 @@ class Context(Object):
         sys.stdout.write('\t},\n')
         sys.stdout.flush()
 
-        return minindex, maxindex
+        return minindex + ibias, maxindex + ibias
 
     def draw_arrays(self, mode, start, count):
         self.dump_vertices(start, count)
@@ -532,22 +532,22 @@ class Context(Object):
         self.real.draw_arrays(mode, start, count)
         self._set_dirty()
     
-    def draw_elements(self, indexBuffer, indexSize, mode, start, count):
+    def draw_elements(self, indexBuffer, indexSize, indexBias, mode, start, count):
         if self.interpreter.verbosity(2):
-            minindex, maxindex = self.dump_indices(indexBuffer, indexSize, start, count)
+            minindex, maxindex = self.dump_indices(indexBuffer, indexSize, indexBias, start, count)
             self.dump_vertices(minindex, maxindex - minindex)
 
-        self.real.draw_elements(indexBuffer, indexSize, mode, start, count)
+        self.real.draw_elements(indexBuffer, indexSize, indexBias, mode, start, count)
         self._set_dirty()
         
-    def draw_range_elements(self, indexBuffer, indexSize, minIndex, maxIndex, mode, start, count):
+    def draw_range_elements(self, indexBuffer, indexSize, indexBias, minIndex, maxIndex, mode, start, count):
         if self.interpreter.verbosity(2):
-            minindex, maxindex = self.dump_indices(indexBuffer, indexSize, start, count)
+            minindex, maxindex = self.dump_indices(indexBuffer, indexSize, indexBias, start, count)
             minindex = min(minindex, minIndex)
             maxindex = min(maxindex, maxIndex)
             self.dump_vertices(minindex, maxindex - minindex)
 
-        self.real.draw_range_elements(indexBuffer, indexSize, minIndex, maxIndex, mode, start, count)
+        self.real.draw_range_elements(indexBuffer, indexSize, indexBias, minIndex, maxIndex, mode, start, count)
         self._set_dirty()
         
     def surface_copy(self, dest, destx, desty, src, srcx, srcy, width, height):