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Author: theagentd (posted 2016-03-11 11:44:16, viewed 2848 times)

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package test;

import org.lwjgl.PointerBuffer;
import org.lwjgl.system.MemoryUtil;
import org.lwjgl.vulkan.VK10;
import org.lwjgl.vulkan.VkSubmitInfo;

public class BufferStackTest {

   private static final int ITERATIONS = 128*1024;
   private static final int POINTER_BUFFER_SIZE = 4;
   
   public static BufferStack stack;
   
   public static void main(String[] args) {
      
      stack = new BufferStack();
      
      //Warmup:
      for(int i = 0; i < 4; i++){
         testMemUtilBuffer();
         testMemUtilStruct();
         testStackBuffer();
         testStackStruct();
      }
      
      long memUtilBuffer = 0;
      long memUtilStruct = 0;
      
      long stackBuffer = 0;
      long stackStruct = 0;
      
      long iterations = 0;
      
      while(true){

         memUtilBuffer += testMemUtilBuffer();
         memUtilStruct += testMemUtilStruct();
         stackBuffer += testStackBuffer();
         stackStruct += testStackStruct();
         
         iterations++;
         if(iterations % 32 == 0){
            System.out.println();
            System.out.println("memAllocPointer(): " + (float)memUtilBuffer / iterations / 1000 / 1000 + " ms");
            System.out.println("VkSubmitInfo.malloc(): " + (float)memUtilStruct / iterations / 1000 / 1000 + " ms");
            System.out.println("stack.allocPointer(): " + (float)stackBuffer / iterations / 1000 / 1000 + " ms");
            System.out.println("VkSubmitInfo.create(stack.nalloc()): " + (float)stackStruct / iterations / 1000 / 1000 + " ms");
         }
      }
   }

   private static long testMemUtilBuffer() {
      
      long startTime = System.nanoTime();
      
      for(int i = 0; i < ITERATIONS; i++){
         PointerBuffer b = MemoryUtil.memAllocPointer(POINTER_BUFFER_SIZE);
         b.put(0, 1234);
         MemoryUtil.memFree(b);
      }
      
      return System.nanoTime() - startTime;
   }

   private static long testMemUtilStruct() {
      
      long startTime = System.nanoTime();

      for(int i = 0; i < ITERATIONS; i++){
         VkSubmitInfo info = VkSubmitInfo.malloc();
         info.sType(VK10.VK_STRUCTURE_TYPE_SUBMIT_INFO);
         info.free();
      }
      
      return System.nanoTime() - startTime;
   }

   private static long testStackBuffer() {
      
      long startTime = System.nanoTime();
      
      for(int i = 0; i < ITERATIONS; i++){
         stack.push();
         PointerBuffer b = stack.allocPointer(POINTER_BUFFER_SIZE);
         b.put(0, 1234);
         stack.pop();
      }
      
      return System.nanoTime() - startTime;
   }

   private static long testStackStruct() {
      
      long startTime = System.nanoTime();

      for(int i = 0; i < ITERATIONS; i++){
         stack.push();
         VkSubmitInfo info = VkSubmitInfo.create(stack.nalloc(VkSubmitInfo.SIZEOF));
         info.sType(VK10.VK_STRUCTURE_TYPE_SUBMIT_INFO);
         stack.pop();
      }
      
      return System.nanoTime() - startTime;
   }
   
}





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