From b9f67df6e72e3a33b91c7d942aaa99622efd688c Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Tue, 11 Aug 2009 15:46:46 -0600
Subject: [PATCH] mesa: short-circuit no-change in _mesa_DepthRange()

---
 src/mesa/main/viewport.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index 50e0402d278..309308c983b 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -120,6 +120,10 @@ _mesa_DepthRange(GLclampd nearval, GLclampd farval)
    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
 
+   if (ctx->Viewport.Near == nearval &&
+       ctx->Viewport.Far == farval)
+      return;
+
    ctx->Viewport.Near = (GLfloat) CLAMP(nearval, 0.0, 1.0);
    ctx->Viewport.Far = (GLfloat) CLAMP(farval, 0.0, 1.0);
    ctx->NewState |= _NEW_VIEWPORT;
-- 
2.30.2