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-rw-r--r--src/gallium/drivers/virgl/virgl_screen.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/gallium/drivers/virgl/virgl_screen.h b/src/gallium/drivers/virgl/virgl_screen.h
index 0256d471f22..93b52b5138d 100644
--- a/src/gallium/drivers/virgl/virgl_screen.h
+++ b/src/gallium/drivers/virgl/virgl_screen.h
@@ -58,6 +58,11 @@ virgl_screen(struct pipe_screen *pipe)
boolean
virgl_has_readback_format(struct pipe_screen *screen, enum virgl_formats fmt);
+/* GL_ARB_map_buffer_alignment requires 64 as the minimum alignment value. In
+ * addition to complying with the extension, a high enough alignment value is
+ * expected by various external GL clients. For example, wined3d doesn't like
+ * maps that don't have a 16 byte alignment.
+ */
#define VIRGL_MAP_BUFFER_ALIGNMENT 64
#endif