From 6e2e136428b97d2424ebe626a30d7237015f7ea3 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Tue, 9 Nov 2010 12:24:49 -0700
Subject: [PATCH] mesa: no-op glBufferSubData() on size==0

Fixes http://bugs.freedesktop.org/show_bug.cgi?id=31439

NOTE: this is a candidate for the 7.9 branch
---
 src/mesa/main/bufferobj.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 0a68008a100..76f8259a283 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -1189,6 +1189,9 @@ _mesa_BufferSubDataARB(GLenum target, GLintptrARB offset,
       return;
    }
 
+   if (size == 0)
+      return;
+
    bufObj->Written = GL_TRUE;
 
    ASSERT(ctx->Driver.BufferSubData);
-- 
2.30.2