From: Marek Olšák <maraeo@gmail.com>
Date: Thu, 25 Apr 2013 23:54:41 +0000 (+0200)
Subject: st/mesa: fix a couple of issues in st_bind_ubos
X-Git-Tag: mesa-9.2.1~1226
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=refs%2Fchanges%2F52%2F6552%2F1;p=platform%2Fupstream%2Fmesa.git

st/mesa: fix a couple of issues in st_bind_ubos

- don't reference a buffer for a local variable
  (that's never useful unless it can be the only reference to the buffer)
- check if the buffer is not NULL
- set buffer_size as specified with BindBufferRange

NOTE: This is a candidate for the 9.1 branch.

Reviewed-by: Fredrik Höglund <fredrik@kde.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
---

diff --git a/src/mesa/state_tracker/st_atom_constbuf.c b/src/mesa/state_tracker/st_atom_constbuf.c
index ef208bc..f72af7a 100644
--- a/src/mesa/state_tracker/st_atom_constbuf.c
+++ b/src/mesa/state_tracker/st_atom_constbuf.c
@@ -194,13 +194,25 @@ static void st_bind_ubos(struct st_context *st,
 
       binding = &st->ctx->UniformBufferBindings[shader->UniformBlocks[i].Binding];
       st_obj = st_buffer_object(binding->BufferObject);
-      pipe_resource_reference(&cb.buffer, st_obj->buffer);
 
-      cb.buffer_size = st_obj->buffer->width0 - binding->Offset;
-      cb.buffer_offset = binding->Offset;
+      cb.buffer = st_obj->buffer;
+
+      if (cb.buffer) {
+         cb.buffer_offset = binding->Offset;
+         cb.buffer_size = cb.buffer->width0 - binding->Offset;
+
+         /* AutomaticSize is FALSE if the buffer was set with BindBufferRange.
+          * Take the minimum just to be sure.
+          */
+         if (!binding->AutomaticSize)
+            cb.buffer_size = MIN2(cb.buffer_size, binding->Size);
+      }
+      else {
+         cb.buffer_offset = 0;
+         cb.buffer_size = 0;
+      }
 
       cso_set_constant_buffer(st->cso_context, shader_type, 1 + i, &cb);
-      pipe_resource_reference(&cb.buffer, NULL);
    }
 }