Android Open Source - android_opengles Square

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Back to project page android_opengles.

License

The source code is released under:

MIT License

Java Source Code

package com.example.opengles;
/*  w w  w  . j a  v  a2s . c om*/
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import javax.microedition.khronos.opengles.GL10;
import javax.microedition.khronos.opengles.GL11;

public class Square {

  private FloatBuffer mFVertexBuffer;
  private ByteBuffer mColorBuffer;
  private ByteBuffer mIndexBuffer;

  public Square() {
    float vertices[] = {
        -1.0f, -1.0f,
        1.0f, -1.0f,
        -1.0f, 1.0f,
        1.0f, 1.0f
    };
    byte maxColor = (byte) 255;
    byte colors[] = {
        maxColor, maxColor, 0, maxColor,
        0, maxColor, maxColor, maxColor,
        0, 0, 0, maxColor,
        maxColor, 0, maxColor, maxColor,
    };
    byte indices[] = {
        0, 3, 1,
        0, 2, 3
    };
    ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
    vbb.order(ByteOrder.nativeOrder());
    mFVertexBuffer = vbb.asFloatBuffer();
    mFVertexBuffer.put(vertices);
    mFVertexBuffer.position(0);

    mColorBuffer = ByteBuffer.allocateDirect(colors.length);
    mColorBuffer.put(colors);
    mColorBuffer.position(0);

    mIndexBuffer = ByteBuffer.allocateDirect(indices.length);
    mIndexBuffer.put(indices);
    mIndexBuffer.position(0);
  }

  public void draw(GL10 gl) {
    gl.glFrontFace(GL11.GL_CW);
    gl.glVertexPointer(2, GL11.GL_FLOAT, 0, mFVertexBuffer);
    gl.glColorPointer(4, GL11.GL_UNSIGNED_BYTE, 0, mColorBuffer);
    gl.glDrawElements(GL11.GL_TRIANGLES, 6, GL11.GL_UNSIGNED_BYTE, mIndexBuffer);
    gl.glFrontFace(GL11.GL_CCW);
  }

}

Java Source Code List

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