sampler_library.h

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// Copyright 2013 The Flutter 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 FLUTTER_IMPELLER_RENDERER_SAMPLER_LIBRARY_H_
#define FLUTTER_IMPELLER_RENDERER_SAMPLER_LIBRARY_H_
 
#include "impeller/core/sampler.h"
#include "impeller/core/sampler_descriptor.h"
 
namespace impeller {
 
class SamplerLibrary {
 public:
  virtual ~SamplerLibrary();
 
  /// @brief Retrieve a backend specific sampler object for the given sampler
  ///        descriptor.
  ///
  ///        If the descriptor is invalid or there is a loss of rendering
  ///        context, this method may return a nullptr.
  ///
  ///        The sampler library implementations must cache this sampler object
  ///        and guarantee that the reference will continue to be valid
  ///        throughout the lifetime of the Impeller context.
  virtual const std::unique_ptr<const Sampler>& GetSampler(
      SamplerDescriptor descriptor) = 0;
 
 protected:
  SamplerLibrary();
 
 private:
  SamplerLibrary(const SamplerLibrary&) = delete;
 
  SamplerLibrary& operator=(const SamplerLibrary&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_SAMPLER_LIBRARY_H_