[Mesa-dev] [PATCH] u_vbuf: fix src_offset alignment in u_vbuf_create_vertex_elements()

[Brian Paul]

If the driver says PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY=1,
the driver should never receive a pipe_vertex_element::src_offset value
that's not a multiple of four.  But the vbuf code wasn't actually adjusting
the src_offset value when creating the vertex element state object.

We just need to align the src_offset values put in the driver_attribs[]
array.

See the piglit gl-1.5-vertex-buffer-offsets test.
---
 src/gallium/auxiliary/util/u_vbuf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gallium/auxiliary/util/u_vbuf.c b/src/gallium/auxiliary/util/u_vbuf.c
index b1b89bf..02ae0b8 100644
--- a/src/gallium/auxiliary/util/u_vbuf.c
+++ b/src/gallium/auxiliary/util/u_vbuf.c
@@ -781,10 +781,11 @@ u_vbuf_create_vertex_elements(struct u_vbuf *mgr, unsigned count,
    ve->compatible_vb_mask_all = ~ve->incompatible_vb_mask_any & used_buffers;
    ve->incompatible_vb_mask_all = ~ve->compatible_vb_mask_any & used_buffers;
 
-   /* Align the formats to the size of DWORD if needed. */
+   /* Align the formats and offsets to the size of DWORD if needed. */
    if (!mgr->caps.velem_src_offset_unaligned) {
       for (i = 0; i < count; i++) {
          ve->native_format_size[i] = align(ve->native_format_size[i], 4);
+         driver_attribs[i].src_offset = align(ve->ve[i].src_offset, 4);
       }
    }
 
-- 
1.9.1