/*
* Copyright 2014 MovingBlocks
*
* 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 org.terasology.engine.subsystem.lwjgl;
import gnu.trove.list.TIntList;
import gnu.trove.list.array.TIntArrayList;
import gnu.trove.map.TIntObjectMap;
import gnu.trove.map.hash.TIntObjectHashMap;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL15;
import org.terasology.rendering.VertexBufferObjectUtil;
import java.nio.IntBuffer;
/**
* @author Immortius
*/
public class GLBufferPool {
private static final int BUFFER_FETCH_SIZE = 16;
private boolean traceBufferUsage;
private int totalPoolSize;
private TIntList pool = new TIntArrayList();
private TIntObjectMap<String> usageTracker;
public GLBufferPool(boolean traceBufferUsage) {
this.traceBufferUsage = traceBufferUsage;
if (traceBufferUsage) {
usageTracker = new TIntObjectHashMap<>();
}
}
public int get(String forUseBy) {
if (pool.isEmpty()) {
IntBuffer buffer = BufferUtils.createIntBuffer(BUFFER_FETCH_SIZE);
GL15.glGenBuffers(buffer);
for (int i = 0; i < BUFFER_FETCH_SIZE; ++i) {
pool.add(buffer.get(i));
}
totalPoolSize += BUFFER_FETCH_SIZE;
}
int result = pool.removeAt(pool.size() - 1);
if (traceBufferUsage) {
usageTracker.put(result, forUseBy);
}
return result;
}
public void dispose(int buffer) {
if (buffer != 0) {
pool.add(buffer);
IntBuffer dataBuffer = BufferUtils.createIntBuffer(1);
dataBuffer.put(0);
dataBuffer.flip();
VertexBufferObjectUtil.bufferVboData(buffer, dataBuffer, GL15.GL_STATIC_DRAW);
dataBuffer.flip();
if (traceBufferUsage) {
usageTracker.remove(buffer);
}
}
}
public int getActivePoolSize() {
return totalPoolSize - pool.size();
}
public String getUsageMap() {
if (traceBufferUsage) {
return usageTracker.toString();
}
return "Tracing disabled";
}
}