gallium/svga: Only upload parts of vertexarrays that are actually used

Make sure we only upload parts of vertex arrays that are actually used
by a draw command.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_draw_arrays.c b/src/gallium/drivers/svga/svga_draw_arrays.c
index a6518042eb9..1bb29cc2335 100644
--- a/src/gallium/drivers/svga/svga_draw_arrays.c
+++ b/src/gallium/drivers/svga/svga_draw_arrays.c
@@ -32,6 +32,7 @@
 #include "svga_draw.h"
 #include "svga_draw_private.h"
 #include "svga_context.h"
+#include "svga_resource_buffer.h"
 
 
 #define DBG 0
@@ -191,6 +192,8 @@ simple_draw_arrays( struct svga_hwtnl *hwtnl,
    SVGA3dPrimitiveRange range;
    unsigned hw_prim;
    unsigned hw_count;
+   unsigned i;
+   unsigned src_offs;
 
    hw_prim = svga_translate_prim(prim, count, &hw_count);
    if (hw_count == 0)
@@ -209,6 +212,22 @@ simple_draw_arrays( struct svga_hwtnl *hwtnl,
     * looking at those numbers knows to adjust them by
     * range.indexBias.
     */
+
+   for (i = 0; i < hwtnl->cmd.vdecl_count; i++) {
+      struct pipe_resource *vb = hwtnl->cmd.vdecl_vb[i];
+      struct svga_buffer *sbuf = svga_buffer(vb);
+      unsigned stride = hwtnl->cmd.vdecl[i].array.stride;
+      unsigned tmp_src_offs = sbuf->source_offset;
+
+      if (stride)
+         tmp_src_offs /= stride;
+      assert(i == 0 || tmp_src_offs == src_offs);
+      src_offs = tmp_src_offs;
+   }
+
+   range.indexBias = start - src_offs;
+   assert(range.indexBias >= 0);
+
    return svga_hwtnl_prim( hwtnl, &range, 0, count - 1, NULL );
 }