Mesa (master): mesa: Unbind ARB_copy_buffer and transform feedback buffers on delete.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: cb8ed93dd0faf958493d35a4729c4a00a201af8d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=cb8ed93dd0faf958493d35a4729c4a00a201af8d

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sun Jun  3 22:34:32 2012 -0700

mesa: Unbind ARB_copy_buffer and transform feedback buffers on delete.

According to the GL 3.1 spec, section 2.9 ("Buffer Objects"):
"If a buffer object is deleted while it is bound, all bindings to that
 object in the current context (i.e. in the thread that called
 DeleteBuffers) are reset to zero."

The code already checked for a number of cases, but neglected these
newer binding points.

+21 oglconforms.

NOTE: This is a candidate for stable release branches.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/main/bufferobj.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index ae7bac1..fe7db2a 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -821,6 +821,19 @@ _mesa_DeleteBuffersARB(GLsizei n, const GLuint *ids)
             _mesa_BindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 );
          }
 
+         /* unbind ARB_copy_buffer binding points */
+         if (ctx->CopyReadBuffer == bufObj) {
+            _mesa_BindBufferARB( GL_COPY_READ_BUFFER, 0 );
+         }
+         if (ctx->CopyWriteBuffer == bufObj) {
+            _mesa_BindBufferARB( GL_COPY_WRITE_BUFFER, 0 );
+         }
+
+         /* unbind transform feedback binding point */
+         if (ctx->TransformFeedback.CurrentBuffer == bufObj) {
+            _mesa_BindBufferARB( GL_TRANSFORM_FEEDBACK_BUFFER, 0 );
+         }
+
          /* unbind any pixel pack/unpack pointers bound to this buffer */
          if (ctx->Pack.BufferObj == bufObj) {
             _mesa_BindBufferARB( GL_PIXEL_PACK_BUFFER_EXT, 0 );