Android Open Source - android-per-pixel-lighting-demo Mesh

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License

The source code is released under:

Apache License

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Java Source Code

package com.pedroedrasousa.object3d;
/* www .  ja  v  a 2s. c om*/
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;

import android.opengl.GLES20;

public class Mesh {
  
  private static final int BYTES_PER_FLOAT = 4;
  private static final int BYTES_PER_SHORT = 2;

  private FloatBuffer  mVertexBuffer;
  private ShortBuffer  mIndexBuffer;
  
  private int mVBO[] = new int[2];
  
  public void setVertexData(float[] data, short[] indices) {
    
    ByteBuffer  byteBuf;
    
    // Generate two buffer objects, one for the vertex data, other for the indices.
    GLES20.glGenBuffers(2, mVBO, 0);
    
    // Vertex data buffer
    byteBuf = ByteBuffer.allocateDirect(data.length * BYTES_PER_FLOAT);
    byteBuf.order(ByteOrder.nativeOrder());
    mVertexBuffer = byteBuf.asFloatBuffer();
    mVertexBuffer.put(data);
    mVertexBuffer.position(0);
    
    // Create a new data store for the vertex data buffer.
    GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, mVBO[0]);
    GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, mVertexBuffer.capacity() * BYTES_PER_FLOAT, mVertexBuffer, GLES20.GL_STATIC_DRAW);
    GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
    
    // Index buffer
    byteBuf = ByteBuffer.allocateDirect(indices.length * BYTES_PER_SHORT);
    byteBuf.order(ByteOrder.nativeOrder());
    mIndexBuffer = byteBuf.asShortBuffer();
    mIndexBuffer.put(indices);
    mIndexBuffer.position(0);
    
    // Create a new data store for the index buffer.
    GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, mVBO[1]);
    GLES20.glBufferData(GLES20.GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer.capacity() * BYTES_PER_SHORT, mIndexBuffer, GLES20.GL_STATIC_DRAW);
    GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
  }
  
  public void bindVertexBuffers() {
    GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, mVBO[0]);
    GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, mVBO[1]);
  }
  
  public void unbindVertexBuffers() {
    GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
    GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
  }
  
  public void render() {
    GLES20.glDrawElements(GLES20.GL_TRIANGLES, mIndexBuffer.capacity(), GLES20.GL_UNSIGNED_SHORT, 0);
  }
}

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