util: added util_set_index_buffer()

Like util_set_vertex_buffers_count(), this basically just copies a
pipe_index_buffer object, taking care of refcounting.

2 files changed, 18 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_helpers.c b/src/gallium/auxiliary/util/u_helpers.c
index ac1edcdbb82..09619c1c9e9 100644
--- a/src/gallium/auxiliary/util/u_helpers.c
+++ b/src/gallium/auxiliary/util/u_helpers.c
@@ -88,3 +88,18 @@ void util_set_vertex_buffers_count(struct pipe_vertex_buffer *dst,
 
    *dst_count = util_last_bit(enabled_buffers);
 }
+
+
+void
+util_set_index_buffer(struct pipe_index_buffer *dst,
+                      const struct pipe_index_buffer *src)
+{
+   if (src) {
+      pipe_resource_reference(&dst->buffer, src->buffer);
+      memcpy(dst, src, sizeof(*dst));
+   }
+   else {
+      pipe_resource_reference(&dst->buffer, NULL);
+      memset(dst, 0, sizeof(*dst));
+   }
+}
diff --git a/src/gallium/auxiliary/util/u_helpers.h b/src/gallium/auxiliary/util/u_helpers.h
index 09c7116fa6d..f25f2807fe5 100644
--- a/src/gallium/auxiliary/util/u_helpers.h
+++ b/src/gallium/auxiliary/util/u_helpers.h
@@ -44,6 +44,9 @@ void util_set_vertex_buffers_count(struct pipe_vertex_buffer *dst,
                                    const struct pipe_vertex_buffer *src,
                                    unsigned start_slot, unsigned count);
 
+void util_set_index_buffer(struct pipe_index_buffer *dst,
+                           const struct pipe_index_buffer *src);
+
 #ifdef __cplusplus
 }
 #endif