Make ShareGroup thread safe

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 "../client/atomicops.h"
 #include "../client/share_group.h"
+#include "../client/gles2_implementation.h"
+#include "../client/program_info_manager.h"
+#include "../common/id_allocator.h"
 #include "../common/logging.h"
 
 namespace gpu {
 namespace gles2 {
 
-ShareGroup::ShareGroup() {
+COMPILE_ASSERT(gpu::kInvalidResource == 0,
+               INVALID_RESOURCE_NOT_0_AS_GL_EXPECTS);
+
+// An id handler for non-shared ids.
+class NonSharedIdHandler : public IdHandlerInterface {
+ public:
+  NonSharedIdHandler() { }
+  virtual ~NonSharedIdHandler() { }
+
+  // Overridden from IdHandlerInterface.
+  virtual void Destroy(GLES2Implementation* /* gl_impl */) {
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual void MakeIds(
+      GLES2Implementation* /* gl_impl */,
+      GLuint id_offset, GLsizei n, GLuint* ids) {
+    if (id_offset == 0) {
+      for (GLsizei ii = 0; ii < n; ++ii) {
+        ids[ii] = id_allocator_.AllocateID();
+      }
+    } else {
+      for (GLsizei ii = 0; ii < n; ++ii) {
+        ids[ii] = id_allocator_.AllocateIDAtOrAbove(id_offset);
+        id_offset = ids[ii] + 1;
+      }
+    }
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual bool FreeIds(
+      GLES2Implementation* /* gl_impl */,
+      GLsizei n, const GLuint* ids) {
+    for (GLsizei ii = 0; ii < n; ++ii) {
+      id_allocator_.FreeID(ids[ii]);
+    }
+    return true;
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual bool MarkAsUsedForBind(GLuint id) {
+    return id == 0 ? true : id_allocator_.MarkAsUsed(id);
+  }
+ private:
+  IdAllocator id_allocator_;
+};
+
+// An id handler for non-shared ids that are never reused.
+class NonSharedNonReusedIdHandler : public IdHandlerInterface {
+ public:
+  NonSharedNonReusedIdHandler() : last_id_(0) { }
+  virtual ~NonSharedNonReusedIdHandler() { }
+
+  // Overridden from IdHandlerInterface.
+  virtual void Destroy(GLES2Implementation* /* gl_impl */) {
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual void MakeIds(
+      GLES2Implementation* /* gl_impl */,
+      GLuint id_offset, GLsizei n, GLuint* ids) {
+    for (GLsizei ii = 0; ii < n; ++ii) {
+      ids[ii] = ++last_id_ + id_offset;
+    }
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual bool FreeIds(
+      GLES2Implementation* /* gl_impl */,
+      GLsizei /* n */, const GLuint* /* ids */) {
+    // Ids are never freed.
+    return true;
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual bool MarkAsUsedForBind(GLuint /* id */) {
+    // This is only used for Shaders and Programs which have no bind.
+    return false;
+  }
+
+ private:
+  GLuint last_id_;
+};
+
+// An id handler for shared ids.
+class SharedIdHandler : public IdHandlerInterface {
+ public:
+  SharedIdHandler(
+      id_namespaces::IdNamespaces id_namespace)
+      : id_namespace_(id_namespace) {
+  }
+
+  virtual ~SharedIdHandler() { }
+
+  // Overridden from IdHandlerInterface.
+  virtual void Destroy(GLES2Implementation* /* gl_impl */) {
+  }
+
+  virtual void MakeIds(
+      GLES2Implementation* gl_impl,
+      GLuint id_offset, GLsizei n, GLuint* ids) {
+    gl_impl->GenSharedIdsCHROMIUM(id_namespace_, id_offset, n, ids);
+  }
+
+  virtual bool FreeIds(
+      GLES2Implementation* gl_impl,
+      GLsizei n, const GLuint* ids) {
+    gl_impl->DeleteSharedIdsCHROMIUM(id_namespace_, n, ids);
+    // We need to ensure that the delete call is evaluated on the service side
+    // before any other contexts issue commands using these client ids.
+    gl_impl->helper()->CommandBufferHelper::Flush();
+    return true;
+  }
+
+  virtual bool MarkAsUsedForBind(GLuint /* id */) {
+    // This has no meaning for shared resources.
+    return true;
+  }
+
+ private:
+  id_namespaces::IdNamespaces id_namespace_;
+};
+
+// An id handler for shared ids that requires ids are made before using and
+// that only the context that created the id can delete it.
+// Assumes the service will enforce that non made ids generate an error.
+class StrictSharedIdHandler : public IdHandlerInterface {
+ public:
+  StrictSharedIdHandler(
+      id_namespaces::IdNamespaces id_namespace)
+      : id_namespace_(id_namespace) {
+  }
+
+  virtual ~StrictSharedIdHandler() {
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual void Destroy(GLES2Implementation* gl_impl) {
+    GPU_DCHECK(gl_impl);
+    // Free all the ids not being used.
+    while (!free_ids_.empty()) {
+      GLuint ids[kNumIdsToGet];
+      int count = 0;
+      while (count < kNumIdsToGet && !free_ids_.empty()) {
+        ids[count++] = free_ids_.front();
+        free_ids_.pop();
+      }
+      gl_impl->DeleteSharedIdsCHROMIUM(id_namespace_, count, ids);
+    }
+  }
+
+  virtual void MakeIds(
+      GLES2Implementation* gl_impl,
+      GLuint id_offset, GLsizei n, GLuint* ids) {
+    GPU_DCHECK(gl_impl);
+    for (GLsizei ii = 0; ii < n; ++ii) {
+      ids[ii] = GetId(gl_impl, id_offset);
+    }
+  }
+
+  virtual bool FreeIds(
+      GLES2Implementation* /* gl_impl */,
+      GLsizei n, const GLuint* ids) {
+    // OpenGL sematics. If any id is bad none of them get freed.
+    for (GLsizei ii = 0; ii < n; ++ii) {
+      GLuint id = ids[ii];
+      if (id != 0) {
+        ResourceIdSet::iterator it = used_ids_.find(id);
+        if (it == used_ids_.end()) {
+          return false;
+        }
+      }
+    }
+    for (GLsizei ii = 0; ii < n; ++ii) {
+      GLuint id = ids[ii];
+      if (id != 0) {
+        ResourceIdSet::iterator it = used_ids_.find(id);
+        if (it != used_ids_.end()) {
+          used_ids_.erase(it);
+          free_ids_.push(id);
+        }
+      }
+    }
+    return true;
+  }
+
+  virtual bool MarkAsUsedForBind(GLuint id) {
+    GPU_DCHECK(id == 0 || used_ids_.find(id) != used_ids_.end());
+    // This has no meaning for shared resources.
+    return true;
+  }
+
+ private:
+  static const GLsizei kNumIdsToGet = 2048;
+  typedef std::queue<GLuint> ResourceIdQueue;
+  typedef std::set<GLuint> ResourceIdSet;
+
+  GLuint GetId(GLES2Implementation* gl_impl, GLuint id_offset) {
+    GPU_DCHECK(gl_impl);
+    if (free_ids_.empty()) {
+      GLuint ids[kNumIdsToGet];
+      gl_impl->GenSharedIdsCHROMIUM(
+          id_namespace_, id_offset, kNumIdsToGet, ids);
+      for (GLsizei ii = 0; ii < kNumIdsToGet; ++ii) {
+        free_ids_.push(ids[ii]);
+      }
+    }
+    GLuint id = free_ids_.front();
+    free_ids_.pop();
+    used_ids_.insert(id);
+    return id;
+  }
+
+  id_namespaces::IdNamespaces id_namespace_;
+  ResourceIdSet used_ids_;
+  ResourceIdQueue free_ids_;
+};
+
+#ifndef _MSC_VER
+const GLsizei StrictSharedIdHandler::kNumIdsToGet;
+#endif
+
+class ThreadSafeIdHandlerWrapper : public IdHandlerInterface {
+ public:
+  ThreadSafeIdHandlerWrapper(IdHandlerInterface* id_handler)
+      : id_handler_(id_handler) {
+  }
+  virtual ~ThreadSafeIdHandlerWrapper() { }
+
+  // Overridden from IdHandlerInterface.
+  virtual void Destroy(GLES2Implementation* gl_impl) {
+    AutoLock auto_lock(lock_);
+    id_handler_->Destroy(gl_impl);
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual void MakeIds(
+      GLES2Implementation* gl_impl, GLuint id_offset, GLsizei n, GLuint* ids) {
+    AutoLock auto_lock(lock_);
+    id_handler_->MakeIds(gl_impl, id_offset, n, ids);
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual bool FreeIds(
+      GLES2Implementation* gl_impl, GLsizei n, const GLuint* ids) {
+    AutoLock auto_lock(lock_);
+    return id_handler_->FreeIds(gl_impl, n, ids);
+  }
+
+  // Overridden from IdHandlerInterface.
+  virtual bool MarkAsUsedForBind(GLuint id) {
+    AutoLock auto_lock(lock_);
+    return id_handler_->MarkAsUsedForBind(id);
+  }
+
+ private:
+   IdHandlerInterface* id_handler_;
+   Lock lock_;
+};
+
+ShareGroup::ShareGroup(bool share_resources, bool bind_generates_resource)
+    : sharing_resources_(share_resources),
+      bind_generates_resource_(bind_generates_resource),
+      gles2_(NULL) {
   GPU_CHECK(ShareGroup::ImplementsThreadSafeReferenceCounting());
+
+  if (sharing_resources_) {
+    if (!bind_generates_resource_) {
+      for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
+        id_handlers_[i].reset(new ThreadSafeIdHandlerWrapper(
+            new StrictSharedIdHandler(
+                static_cast<id_namespaces::IdNamespaces>(i))));
+      }
+    } else {
+      for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
+        id_handlers_[i].reset(new ThreadSafeIdHandlerWrapper(
+            new SharedIdHandler(
+                static_cast<id_namespaces::IdNamespaces>(i))));
+      }
+    }
+  } else {
+    for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
+      if (i == id_namespaces::kProgramsAndShaders)
+        id_handlers_[i].reset(new NonSharedNonReusedIdHandler);
+      else
+        id_handlers_[i].reset(new NonSharedIdHandler);
+    }
+  }
+  program_info_manager_.reset(ProgramInfoManager::Create(sharing_resources_));
 }
 
 ShareGroup::~ShareGroup() {
+  for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
+    id_handlers_[i]->Destroy(gles2_);
+    id_handlers_[i].reset();
+  }
 }
 
+void ShareGroup::SetGLES2ImplementationForDestruction(
+    GLES2Implementation* gl_impl) {
+  gles2_ = gl_impl;
+}
+
+
 }  // namespace gles2
 }  // namespace gpu