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-rw-r--r--src/mesa/drivers/dri/swrast/swrast.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/swrast/swrast.c b/src/mesa/drivers/dri/swrast/swrast.c
index c062071b09b..73dc5c4c061 100644
--- a/src/mesa/drivers/dri/swrast/swrast.c
+++ b/src/mesa/drivers/dri/swrast/swrast.c
@@ -406,8 +406,8 @@ swrast_map_renderbuffer(struct gl_context *ctx,
(char *) xrb->Base.Buffer,
dPriv->loaderPrivate);
- *out_map = xrb->Base.Buffer;
- *out_stride = stride;
+ *out_map = xrb->Base.Buffer + (h - 1) * stride;
+ *out_stride = -stride;
return;
}