content: /*
   * Copyright 2022 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.google.android.exoplayer2.effect;
  
  import android.content.Context;
  import androidx.annotation.WorkerThread;
  import com.google.android.exoplayer2.util.FrameProcessingException;
  import com.google.android.exoplayer2.util.GlUtil;
  
  /**
   * Specifies color transformations using color lookup tables to apply to each frame in the fragment
   * shader.
   */
  public interface ColorLut extends GlEffect {
  
    /**
     * Returns the OpenGL texture ID of the LUT to apply to the pixels of the frame with the given
     * timestamp.
     */
    int getLutTextureId(long presentationTimeUs);
  
    /** Returns the length N of the 3D N x N x N LUT cube with the given timestamp. */
    int getLength(long presentationTimeUs);
  
    /** Releases the OpenGL texture of the LUT. */
    void release() throws GlUtil.GlException;
  
    /** This method must be executed on the same thread as other GL commands. */
    @Override
    @WorkerThread
    default SingleFrameGlTextureProcessor toGlTextureProcessor(Context context, boolean useHdr)
        throws FrameProcessingException {
      return new ColorLutProcessor(context, /* colorLut= */ this, useHdr);
    }
  }
  