Add subscribeUniform extension pipeline

gpu/command_buffer/service/uniform_subscription_manager.h

Index: gpu/command_buffer/service/uniform_subscription_manager.h
diff --git a/gpu/command_buffer/service/uniform_subscription_manager.h b/gpu/command_buffer/service/uniform_subscription_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..6b562eb74e139b807b4f5d74bf45e1b963cfcf0c
--- /dev/null
+++ b/gpu/command_buffer/service/uniform_subscription_manager.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2014 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.
+
+#ifndef GPU_COMMAND_BUFFER_SERVICE_UNIFORM_SUBSCRIPTION_MANAGER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_UNIFORM_SUBSCRIPTION_MANAGER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/containers/hash_tables.h"
+#include "base/memory/ref_counted.h"
+#include "gpu/command_buffer/service/gl_utils.h"
+#include "gpu/command_buffer/service/program_manager.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+namespace gles2 {
+
+// This class keeps track of the mapping of uniform locations to types,
+// along with the current uniform state
+class GPU_EXPORT UniformSubscriptionManager {
+ public:
+  typedef std::vector<std::pair<GLenum, GLint>> ProgramSubscriptions;

[piman, 2014/10/21 20:00:41]

Please define a real struct for the pair. At the call site, "first" and "second"
is much less readable than "target" and "location".

[orglofch, 2014/10/22 23:10:21]

I've changed this to be a map to enforce 1:1 mapping of location -> target.

+
+  UniformSubscriptionManager();
+  ~UniformSubscriptionManager();
+
+  void Destroy(bool have_context);
+
+  // Subscribe uniform |location| in program specified by |client_id|
+  // to |target|
+  void AddSubscription(GLuint client_id, GLint location, GLenum target);
+
+  // Update the active_state of the subscriptions
+  void ActivateUniformSubscriptionState();
+
+  const ProgramSubscriptions* SubscriptionsForProgram(GLuint client_id);
+
+  static Program::UniformApiType ApiTypeForTarget(GLenum target);
+
+ private:
+  typedef base::hash_map<GLint, ProgramSubscriptions> SubscriptionMap;
+
+  SubscriptionMap subscriptions_;
+
+  DISALLOW_COPY_AND_ASSIGN(UniformSubscriptionManager);
+};
+
+}  // namespage gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_UNIFORM_SUBSCRIPTION_MANAGER_H_