vbo: introduce vbo_get_minmax_indices function

Introduce vbo_get_minmax_indices() function to handle the min/max index
computation for nr_prims(>= 1). The old code just compute the first
prim's min/max index; this would results an error rendering if user
called functions like glMultiDrawElements(). This patch servers as
fixing this issue.

As when nr_prims = 1, we can pass 1 to paramter nr_prims, thus I made
vbo_get_minmax_index() static.

v2: per Roland's suggestion, put the indices address compuation into
    vbo_get_minmax_index() instead.

    Also do comination if possible to reduce map/unmap count

v3: per Brian's suggestion, use a pointer for start_prim to avoid
    structure copy per loop.

Signed-off-by: Yuanhan Liu <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/mesa/tnl/t_draw.c b/src/mesa/tnl/t_draw.c
index f949c34d335..17042cf8f37 100644
--- a/src/mesa/tnl/t_draw.c
+++ b/src/mesa/tnl/t_draw.c
@@ -418,7 +418,7 @@ void _tnl_vbo_draw_prims(struct gl_context *ctx,
 			 struct gl_transform_feedback_object *tfb_vertcount)
 {
    if (!index_bounds_valid)
-      vbo_get_minmax_index(ctx, prim, ib, &min_index, &max_index);
+      vbo_get_minmax_indices(ctx, prim, ib, &min_index, &max_index, nr_prims);
 
    _tnl_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);
 }