/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef WEBGL_MEMORY_TRACKER_H_

#define WEBGL_MEMORY_TRACKER_H_

#include "mozilla/StaticPtr.h"

#include "nsIMemoryReporter.h"

namespace mozilla {

class WebGLContext;

class WebGLMemoryTracker : public nsIMemoryReporter

{

    NS_DECL_THREADSAFE_ISUPPORTS

    NS_DECL_NSIMEMORYREPORTER

    WebGLMemoryTracker();

    static StaticRefPtr<WebGLMemoryTracker> sUniqueInstance;

    // Here we store plain pointers, not RefPtrs: we don't want the

    // WebGLMemoryTracker unique instance to keep alive all

    // WebGLContexts ever created.

    typedef nsTArray<const WebGLContext*> ContextsArrayType;

    ContextsArrayType mContexts;

    void InitMemoryReporter();

    static WebGLMemoryTracker* UniqueInstance();

    static ContextsArrayType& Contexts() { return UniqueInstance()->mContexts; }

    friend class WebGLContext;

  public:

    static void AddWebGLContext(const WebGLContext* c) {

        Contexts().AppendElement(c);

    }

    static void RemoveWebGLContext(const WebGLContext* c) {

        ContextsArrayType & contexts = Contexts();

        contexts.RemoveElement(c);

        if (contexts.IsEmpty()) {

            sUniqueInstance = nullptr;

        }

    }

  private:

    virtual ~WebGLMemoryTracker();

    static int64_t GetTextureMemoryUsed();

    static int64_t GetTextureCount();

    static int64_t GetBufferMemoryUsed();

    static int64_t GetBufferCacheMemoryUsed();

    static int64_t GetBufferCount();

    static int64_t GetRenderbufferMemoryUsed();

    static int64_t GetRenderbufferCount();

    static int64_t GetShaderSize();

    static int64_t GetShaderCount();

    static int64_t GetContextCount() {

        return Contexts().Length();

    }

};

} // namespace mozilla

#endif // WEBGL_MEMORY_TRACKER_H_