VBOUtils.java

VBOUtils.java

package gl;

import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.util.ArrayList;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.ARBVertexBufferObject;
import org.lwjgl.opengl.ContextCapabilities;
import org.lwjgl.opengl.GLContext;

public class VBOUtils
{
  public static int createBuffer()
  {
    if (supportsBuffers())
    {
      IntBuffer buffer = BufferUtils.createIntBuffer(1);
      ARBVertexBufferObject.glGenBuffersARB(buffer);
      return buffer.get(0);
    }
    return 0;
  }
  
  public static void storeVertexData(int bufferIndex, FloatBuffer geometryData)
  {
    if (supportsBuffers())
    {
      ARBVertexBufferObject.glBindBufferARB(34962, bufferIndex);
      ARBVertexBufferObject.glBufferDataARB(34962, geometryData, 35044);
    }
  }
  
  public static void storeIndexData(int bufferIndex, IntBuffer indexes)
  {
    if (supportsBuffers())
    {
      ARBVertexBufferObject.glBindBufferARB(34963, bufferIndex);
      ARBVertexBufferObject.glBufferDataARB(34963, indexes, 35044);
    }
  }
  
  public static void destroyBuffers(ArrayList<Integer> bufferList)
  {
    if (!supportsBuffers()) {
      return;
    }
    IntBuffer bufferIDBuffer = BufferUtils.createIntBuffer(bufferList.size());
    for (int i = 0; i < bufferList.size(); i++) {
      bufferIDBuffer.put(((Integer)bufferList.get(i)).intValue());
    }
    bufferIDBuffer.rewind();
    ARBVertexBufferObject.glDeleteBuffersARB(bufferIDBuffer);
  }
  
  private static boolean supportsBuffers()
  {
    return GLContext.getCapabilities().GL_ARB_vertex_buffer_object;
  }
}