copy To opengl Buffer - Android android.opengl

Android examples for android.opengl:OpenGL Buffer

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Description

copy To opengl Buffer

Demo Code


import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;

import android.opengl.GLES20;

public class Main {
  private static final int TYPE_SIZE = 4;
  private static final int SHORT_SIZE = Short.SIZE / 8;

  public static int copyToBuffer(float[] arr) {
    return copyToBuffer(arr, arr.length);
  }//from w  w w  .j  a v  a  2  s  .c  o m

  public static int copyToBuffer(float[] arr, int len) {
    // allocate a buffer of the right size...

    // size of float = 4 bytes so size of buffer = 4 * length of float array
    FloatBuffer floatBuf = ByteBuffer.allocateDirect(len * TYPE_SIZE)
        .order(ByteOrder.nativeOrder()) // use the device hardware's native byte
                                        // order
        .asFloatBuffer(); // create a floating point buffer from the ByteBuffer

    floatBuf.put(arr, 0, len) // copy the array into the buffer
        .position(0); // set the buffer to read the first coordinate

    int err;
    if ((err = GLES20.glGetError()) != 0) {
      // DebugLog.e("buff", "err " + err);
    }

    int[] buffer = new int[1];
    GLES20.glGenBuffers(1, buffer, 0);
    int handle = buffer[0];
    GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, handle);
    GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, len * TYPE_SIZE, floatBuf,
        GLES20.GL_STATIC_DRAW);

    if ((err = GLES20.glGetError()) != 0) {
      // DebugLog.e("buff", "err " + err);
    }

    return handle;
  }

  public static int copyToBuffer(int target, short[] arr, int len) {
    // allocate a buffer of the right size...

    // size of float = 4 bytes so size of buffer = 4 * length of float array
    ShortBuffer buf = ByteBuffer.allocateDirect(len * SHORT_SIZE)
        .order(ByteOrder.nativeOrder()) // use the device hardware's native byte
                                        // order
        .asShortBuffer(); // create a floating point buffer from the ByteBuffer

    buf.put(arr, 0, len) // copy the array into the buffer
        .position(0); // set the buffer to read the first coordinate

    int[] buffer = new int[1];
    GLES20.glGenBuffers(1, buffer, 0);
    int handle = buffer[0];
    GLES20.glBindBuffer(target, handle);
    GLES20.glBufferData(target, len * SHORT_SIZE, buf, GLES20.GL_STATIC_DRAW);

    return handle;
  }
}

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