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Author: theagentd (posted 2014-05-11 02:43:38, viewed 140 times)

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package engine.profile;

import java.util.ArrayList;

import engine.etc.FastArrayList;
import engine.etc.pool.Pool;
import static org.lwjgl.opengl.GL15.*;
import static org.lwjgl.opengl.GL33.*;

public class GPUProfiler {
   
   private static final boolean PROFILING_ENABLED = true;
   
   private static Pool<GPUTaskProfile> taskPool;
   private static ArrayList<Integer> queryObjects;
   
   private static int frameCounter;
   
   private static GPUTaskProfile currentTask;
   
   private static ArrayList<GPUTaskProfile> completedFrames;
   
   static{
      taskPool = new Pool<GPUTaskProfile>() {
         @Override
         protected GPUTaskProfile create() {
            return new GPUTaskProfile();
         }
      };
      queryObjects = new ArrayList<>();
      
      
      
      frameCounter = 0;
      
      completedFrames = new ArrayList<>();
   }
   
   public static void startFrame(){
      
      if(currentTask != null){
         throw new IllegalStateException("Previous frame not ended properly!");
      }
      if(PROFILING_ENABLED){
         currentTask = taskPool.get().init(null, "Frame " + (++frameCounter), getQuery());
      }
   }
   
   public static void start(String name){
      if(PROFILING_ENABLED && currentTask != null){
         currentTask = taskPool.get().init(currentTask, name, getQuery());
      }
   }
   
   public static void end(){
      if(PROFILING_ENABLED && currentTask != null){
         currentTask = currentTask.end(getQuery());
      }
      
   }
   
   public static void endFrame(){

      if(PROFILING_ENABLED){
         if(currentTask.getParent() != null){
            throw new IllegalStateException("Error ending frame. Not all tasks finished.");
         }
         currentTask.end(getQuery());
         
         if(completedFrames.size() < 5){
            completedFrames.add(currentTask);
         }else{
            recycle(currentTask);
         }
         
         currentTask = null;
      }
   }
   
   public static GPUTaskProfile getFrameResults(){
      if(completedFrames.isEmpty()){
         return null;
      }
      
      GPUTaskProfile frame = completedFrames.get(0);
      if(frame.resultsAvailable()){
         return completedFrames.remove(0);
      }else{
         return null;
      }
   }
   
   public static void recycle(GPUTaskProfile task){
      queryObjects.add(task.getStartQuery());
      queryObjects.add(task.getEndQuery());
      
      FastArrayList<GPUTaskProfile> children = task.getChildren();
      for(int i = 0; i < children.size(); i++){
         recycle(children.get(i));
      }
      taskPool.recycle(task);
   }
   
   private static int getQuery(){
      int query; 
      if(!queryObjects.isEmpty()){
         query = queryObjects.remove(queryObjects.size() - 1);
      }else{
         query = glGenQueries();
      }
      
      glQueryCounter(query, GL_TIMESTAMP);
      
      return query;
   }
}





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