command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/client/share_group.cc

 // Copyright (c) 2012 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.
 
 #include <stack>
 #include <vector>
 
 #include "gpu/command_buffer/client/share_group.h"
 
 #include "base/logging.h"
@@ skipping 299 matching lines @@
     return false;
   }
 
   void FreeContext(GLES2Implementation* gl_impl) override {}
 
  private:
   base::Lock lock_;
   GLuint last_id_;
 };
 
+class RangeIdHandler : public RangeIdHandlerInterface {
+ public:
+  RangeIdHandler() {}
+
+  void MakeIdRange(GLES2Implementation* /*gl_impl*/,
+                   GLsizei n,
+                   GLuint* first_id) override {
+    base::AutoLock auto_lock(lock_);
+    *first_id = id_allocator_.AllocateIDRange(n);
+  }
+
+  void FreeIdRange(GLES2Implementation* gl_impl,
+                   const GLuint first_id,
+                   GLsizei range,
+                   DeleteRangeFn delete_fn) override {
+    base::AutoLock auto_lock(lock_);
+    DCHECK(range > 0);
+    id_allocator_.FreeIDRange(first_id, range);
+    (gl_impl->*delete_fn)(first_id, range);
+    gl_impl->helper()->CommandBufferHelper::OrderingBarrier();
+  }
+
+  void FreeContext(GLES2Implementation* gl_impl) override {}
+
+ private:
+  base::Lock lock_;
+  IdAllocator id_allocator_;
+};
+
 ShareGroup::ShareGroup(bool bind_generates_resource)
     : bind_generates_resource_(bind_generates_resource) {
   if (bind_generates_resource) {
     for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
       if (i == id_namespaces::kProgramsAndShaders) {
         id_handlers_[i].reset(new NonReusedIdHandler());
       } else {
         id_handlers_[i].reset(new IdHandler());
       }
     }
   } else {
     for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
       if (i == id_namespaces::kProgramsAndShaders) {
         id_handlers_[i].reset(new NonReusedIdHandler());
       } else {
         id_handlers_[i].reset(new StrictIdHandler(i));
       }
     }
   }
   program_info_manager_.reset(new ProgramInfoManager);
+  for (auto& range_id_handler : range_id_handlers_) {
+    range_id_handler.reset(new RangeIdHandler());
+  }
 }
 
 void ShareGroup::set_program_info_manager(ProgramInfoManager* manager) {
   program_info_manager_.reset(manager);
 }
 
 ShareGroup::~ShareGroup() {}
 
 }  // namespace gles2
 }  // namespace gpu