i965: Provide sse2 version for rgba8 <-> bgra8 swizzle

[mesa.git] / src / mesa / drivers / dri / i965 / intel_mipmap_tree.c

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 108dd87dd8bde06b81d102d80c150c41af08029c..b52bbfb0f67938e6453f8be717ac005f8ca0413b 100644 (file)
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -2773,6 +2773,11 @@ intel_miptree_map(struct brw_context *brw,
    } else if (!(mode & GL_MAP_WRITE_BIT) &&
               !mt->compressed && cpu_has_sse4_1 &&
               (mt->pitch % 16 == 0)) {
+      /*
+       * XXX: without sse4_1, in some situations it would be beneficial
+       * to copy regardless (with an ordinary memcpy) as otherwise mesa
+       * may access uncached memory bytewise.
+       */
       intel_miptree_map_movntdqa(brw, mt, map, level, slice);
 #endif
    } else {