Mesa (master): i965: Add a note about the late-allocation in intel_bufferobj_buffer().

[Eric Anholt]

Module: Mesa
Branch: master
Commit: b37f7e0160ae30d75c939bcd1aab8df3a2178820
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b37f7e0160ae30d75c939bcd1aab8df3a2178820

Author: Eric Anholt <eric at anholt.net>
Date:   Thu Oct  3 19:36:03 2013 -0700

i965: Add a note about the late-allocation in intel_bufferobj_buffer().

This was mostly for the i915 system-memory VBO code, which we don't have
any more, but since that existed we've ended up producing dependencies on
it being there.

Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>

---

 src/mesa/drivers/dri/i965/intel_buffer_objects.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/intel_buffer_objects.c b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
index 5f6b904..8a24727 100644
--- a/src/mesa/drivers/dri/i965/intel_buffer_objects.c
+++ b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
@@ -434,6 +434,10 @@ intel_bufferobj_buffer(struct brw_context *brw,
                        struct intel_buffer_object *intel_obj,
 		       GLuint flag)
 {
+   /* This is needed so that things like transform feedback and texture buffer
+    * objects that need a BO but don't want to check that they exist for
+    * draw-time validation can just always get a BO from a GL buffer object.
+    */
    if (intel_obj->buffer == NULL)
       intel_bufferobj_alloc_buffer(brw, intel_obj);