Mesa (master): mesa: no-op glBufferSubData() on size==0

[Brian Paul]

Module: Mesa
Branch: master
Commit: 6e2e136428b97d2424ebe626a30d7237015f7ea3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6e2e136428b97d2424ebe626a30d7237015f7ea3

Author: Brian Paul <brianp at vmware.com>
Date:   Tue Nov  9 12:24:49 2010 -0700

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 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 0a68008..76f8259 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);