resourcecallback.h

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#ifndef ION_GFXUTILS_RESOURCECALLBACK_H_
#define ION_GFXUTILS_RESOURCECALLBACK_H_

#include <vector>

#include "ion/base/referent.h"
#include "ion/gfx/resourcemanager.h"
#include "ion/port/semaphore.h"

namespace ion {
namespace gfxutils {

template <typename T> class ResourceCallback : public base::Referent {
 public:
  typedef typename base::ReferentPtr<ResourceCallback<T> >::Type RefPtr;
  explicit ResourceCallback(bool do_wait) {
    if (!do_wait)
      semaphore_.Post();
    callback_holder_.Reset(this);
    wait_holder_.Reset(this);
  }

  const std::vector<T>& GetData() const { return data_; }

  void Callback(const std::vector<T>& data) {
    data_ = data;

    RefPtr holder(this);
    callback_holder_ = NULL;

    semaphore_.Post();

    holder = NULL;
  }

  void WaitForCompletion(std::vector<T>* data) {
    semaphore_.Wait();

    if (!callback_holder_.Get() && data)
      *data = data_;

    RefPtr holder(this);
    wait_holder_ = NULL;
    holder = NULL;
  }

 protected:
  ~ResourceCallback() override {
    DCHECK(callback_holder_.Get() == NULL);
    DCHECK(wait_holder_.Get() == NULL);
  }

  std::vector<T> data_;
  port::Semaphore semaphore_;
  RefPtr callback_holder_;
  RefPtr wait_holder_;
};

typedef ResourceCallback<gfx::ResourceManager::ArrayInfo> ArrayCallback;
typedef ResourceCallback<gfx::ResourceManager::BufferInfo> BufferCallback;
typedef ResourceCallback<gfx::ResourceManager::FramebufferInfo>
    FramebufferCallback;
typedef ResourceCallback<gfx::ResourceManager::SamplerInfo> SamplerCallback;
typedef ResourceCallback<gfx::ResourceManager::ShaderInfo> ShaderCallback;
typedef ResourceCallback<gfx::ResourceManager::PlatformInfo> PlatformCallback;
typedef ResourceCallback<gfx::ResourceManager::ProgramInfo> ProgramCallback;
typedef ResourceCallback<gfx::ResourceManager::TextureImageInfo>
    TextureImageCallback;
typedef ResourceCallback<gfx::ResourceManager::TextureInfo> TextureCallback;

}  // namespace gfxutils
}  // namespace ion

#endif  // ION_GFXUTILS_RESOURCECALLBACK_H_