OpenGL Utils 2 : OpenGL « 2D Graphics « Android

1. Android
2. 2D Graphics
3. OpenGL

OpenGL Utils 2

   
//package com.adivasile;

/*
 * Copyright (C) 2008 aki@akjava.com
 *
 * 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.
 */

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class OpenGLUtils {

  public static FloatBuffer allocateFloatBuffer(int capacity) {
    ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
    vbb.order(ByteOrder.nativeOrder());
    return vbb.asFloatBuffer();
  }

  public static IntBuffer allocateInttBuffer(int capacity) {
    ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
    vbb.order(ByteOrder.nativeOrder());
    return vbb.asIntBuffer();
  }

  public static ShortBuffer allocateShortBuffer(int capacity) {
    ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
    vbb.order(ByteOrder.nativeOrder());
    return vbb.asShortBuffer();
  }

  public static void addVertex3f(FloatBuffer buffer, float x, float y, float z) {
    buffer.put(x);
    buffer.put(y);
    buffer.put(z);
  }

  public static void addIndex(ShortBuffer buffer, int index1, int index2,
      int index3) {
    buffer.put((short) index1);
    buffer.put((short) index2);
    buffer.put((short) index3);
  }

  public static void addCoord2f(FloatBuffer buffer, float x, float y) {
    buffer.put(x);
    buffer.put(y);
  }

  public static void addColorf(FloatBuffer buffer, float r, float g, float b,
      float a) {
    buffer.put(r);
    buffer.put(g);
    buffer.put(b);
    buffer.put(a);
  }

  public static FloatBuffer toFloatBufferPositionZero(float[] values) {
    ByteBuffer vbb = ByteBuffer.allocateDirect(values.length * 4);
    vbb.order(ByteOrder.nativeOrder());
    FloatBuffer buffer = vbb.asFloatBuffer();
    buffer.put(values);
    buffer.position(0);
    return buffer;
  }

  public static ShortBuffer toShortBuffer(short[] values) {
    ByteBuffer vbb = ByteBuffer.allocateDirect(values.length * 2);
    vbb.order(ByteOrder.nativeOrder());
    ShortBuffer buffer = vbb.asShortBuffer();
    buffer.put(values);
    buffer.position(0);
    return buffer;
  }

  public static Bitmap loadBitmap(Context mContext, int id) {
    InputStream is = mContext.getResources().openRawResource(id);
    Bitmap bitmap = null;
    try {
      bitmap = BitmapFactory.decodeStream(is);
    } finally {
      try {
        is.close();
      } catch (IOException e) {
        // Ignore.
      }
    }
    return bitmap;
  }

}

   
    
    
  

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