util: add comments to u_upload_mgr and u_inlines

1 files changed, 10 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_inlines.h b/src/gallium/auxiliary/util/u_inlines.h
index 8aaf7a7416..b4870bce98 100644
--- a/src/gallium/auxiliary/util/u_inlines.h
+++ b/src/gallium/auxiliary/util/u_inlines.h
@@ -400,6 +400,12 @@ static INLINE boolean util_get_offset(
    }
 }
 
+/**
+ * This function is used to copy an array of pipe_vertex_buffer structures,
+ * while properly referencing the pipe_vertex_buffer::buffer member.
+ *
+ * \sa util_copy_framebuffer_state
+ */
 static INLINE void util_copy_vertex_buffers(struct pipe_vertex_buffer *dst,
                                             unsigned *dst_count,
                                             const struct pipe_vertex_buffer *src,
@@ -407,13 +413,17 @@ static INLINE void util_copy_vertex_buffers(struct pipe_vertex_buffer *dst,
 {
    unsigned i;
 
+   /* Reference the buffers of 'src' in 'dst'. */
    for (i = 0; i < src_count; i++) {
       pipe_resource_reference(&dst[i].buffer, src[i].buffer);
    }
+   /* Unreference the rest of the buffers in 'dst'. */
    for (; i < *dst_count; i++) {
       pipe_resource_reference(&dst[i].buffer, NULL);
    }
 
+   /* Update the size of 'dst' and copy over the other members
+    * of pipe_vertex_buffer. */
    *dst_count = src_count;
    memcpy(dst, src, src_count * sizeof(struct pipe_vertex_buffer));
 }