gallium/svga: Upload only parts of user-buffers that we actually use

Stream user buffer contents rather than trying to maintain persistent
host / hardware copies.
Resulting negative array offsets are not allowed by the hardware,
(well, at least not according to header files), so adjust index bias
to make all array offsets positive.

Signed-off-by: Thomas Hellstrom <[email protected]>

1 files changed, 10 insertions, 3 deletions

diff --git a/src/gallium/drivers/svga/svga_draw.c b/src/gallium/drivers/svga/svga_draw.c
index 28ba470d8c7..aa096692888 100644
--- a/src/gallium/drivers/svga/svga_draw.c
+++ b/src/gallium/drivers/svga/svga_draw.c
@@ -242,6 +242,11 @@ svga_hwtnl_flush( struct svga_hwtnl *hwtnl )
 }
 
 
+void svga_hwtnl_set_index_bias( struct svga_hwtnl *hwtnl,
+				int index_bias)
+{
+   hwtnl->index_bias = index_bias;
+}
 
 
 
@@ -265,15 +270,16 @@ enum pipe_error svga_hwtnl_prim( struct svga_hwtnl *hwtnl,
          unsigned size = vb ? vb->width0 : 0;
          unsigned offset = hwtnl->cmd.vdecl[i].array.offset;
          unsigned stride = hwtnl->cmd.vdecl[i].array.stride;
-         unsigned index_bias = range->indexBias;
+         int index_bias = (int) range->indexBias + hwtnl->index_bias;
          unsigned width;
 
          assert(vb);
          assert(size);
          assert(offset < size);
-         assert(index_bias >= 0);
          assert(min_index <= max_index);
-         assert(offset + index_bias*stride < size);
+         if (index_bias >= 0) {
+            assert(offset + index_bias*stride < size);
+         }
          if (min_index != ~0) {
             assert(offset + (index_bias + min_index) * stride < size);
          }
@@ -394,6 +400,7 @@ enum pipe_error svga_hwtnl_prim( struct svga_hwtnl *hwtnl,
    hwtnl->cmd.max_index[hwtnl->cmd.prim_count] = max_index;
 
    hwtnl->cmd.prim[hwtnl->cmd.prim_count] = *range;
+   hwtnl->cmd.prim[hwtnl->cmd.prim_count].indexBias += hwtnl->index_bias;
 
    pipe_resource_reference(&hwtnl->cmd.prim_ib[hwtnl->cmd.prim_count], ib);
    hwtnl->cmd.prim_count++;