Adds support for shared resources.

It's not clear how to test this easily
it seems like we an integration test
is needed at some point. I did run the
conformance tests with share_resources
set to true and it rand without crashing.

TEST=unit tests
BUG=none


Review URL: http://codereview.chromium.org/1817002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@46264 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 35 insertions, 0 deletions

diff --git a/gpu/command_buffer/common/id_allocator.cc b/gpu/command_buffer/common/id_allocator.cc
new file mode 100644
index 0000000..22c55e3
--- /dev/null
+++ b/gpu/command_buffer/common/id_allocator.cc
@@ -0,0 +1,35 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This file contains the implementation of IdAllocator.
+
+#include "../common/id_allocator.h"
+#include "../common/logging.h"
+
+namespace gpu {
+
+IdAllocator::IdAllocator() {
+}
+
+ResourceId IdAllocator::FindFirstFree() const {
+  ResourceId id = 1;
+  for (ResourceIdSet::const_iterator it = used_ids_.begin();
+       it != used_ids_.end(); ++it) {
+    if ((*it) != id) {
+      return id;
+    }
+    ++id;
+  }
+  return id;
+}
+
+ResourceId IdAllocator::AllocateIDAtOrAbove(ResourceId desired_id) {
+  DCHECK_LT(static_cast<ResourceId>(used_ids_.size()),
+            static_cast<ResourceId>(-1));
+  for (; InUse(desired_id); ++desired_id);
+  MarkAsUsed(desired_id);
+  return desired_id;
+}
+
+}  // namespace gpu