From fe14110f359b0665cb0c09aa14f13a5ebb33b1bc Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Tue, 9 Feb 2016 09:58:39 -0700
Subject: [PATCH] mesa: fix incorrect viewport position when GL_CLIP_ORIGIN =
 GL_LOWER_LEFT

Ilia Mirkin found/fixed the mistake.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93813
Cc: "11.1" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
---
 src/mesa/main/viewport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index 7d8914291c3..681e46bfcf7 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -456,11 +456,11 @@ _mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
    translate[0] = half_width + x;
    if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
       scale[1] = -half_height;
-      translate[1] = half_height - y;
    } else {
       scale[1] = half_height;
-      translate[1] = half_height + y;
    }
+   translate[1] = half_height + y;
+
    if (ctx->Transform.ClipDepthMode == GL_NEGATIVE_ONE_TO_ONE) {
       scale[2] = 0.5 * (f - n);
       translate[2] = 0.5 * (n + f);
-- 
2.30.2