Cube.java :  » UnTagged » jugglinglab » com » jonglen7 » jugglinglab » jugglinglab » renderer » Android Open Source

package com.jonglen7.jugglinglab.jugglinglab.renderer;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;

import javax.microedition.khronos.opengles.GL10;

import com.jonglen7.jugglinglab.jugglinglab.util.Coordinate;

/**
 * A vertex shaded cube.
 */
class Cube
{
  
    int one = 0x10000;
    
    int cubeVertices[] = {
            -one, -one, -one,
            one, -one, -one,
            one,  one, -one,
            -one,  one, -one,
            -one, -one,  one,
            one, -one,  one,
            one,  one,  one,
            -one,  one,  one,
    };
    int vertices[] = {
            -one, -one, -one,
            one, -one, -one,
            one,  one, -one,
            -one,  one, -one,
            -one, -one,  one,
            one, -one,  one,
            one,  one,  one,
            -one,  one,  one,
    };

    int colors[] = {
            0,    0,    0,  one,
            one,    0,    0,  one,
            one,  one,    0,  one,
            0,  one,    0,  one,
            0,    0,  one,  one,
            one,    0,  one,  one,
            one,  one,  one,  one,
            0,  one,  one,  one,
    };

    byte indices[] = {
            0, 4, 5,    0, 5, 1,
            1, 5, 6,    1, 6, 2,
            2, 6, 7,    2, 7, 3,
            3, 7, 4,    3, 4, 0,
            4, 7, 6,    4, 6, 5,
            3, 0, 1,    3, 1, 2
    };
    
    Coordinate center;
    
    public Cube()
    {
      center = new Coordinate();
      
        // Buffers to be passed to gl*Pointer() functions
        // must be direct, i.e., they must be placed on the
        // native heap where the garbage collector cannot
        // move them.
        //
        // Buffers with multi-byte datatypes (e.g., short, int, float)
        // must have their byte order set to native order

        ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
        vbb.order(ByteOrder.nativeOrder());
        mVertexBuffer = vbb.asIntBuffer();
        mVertexBuffer.put(vertices);
        mVertexBuffer.position(0);

        ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length*4);
        cbb.order(ByteOrder.nativeOrder());
        mColorBuffer = cbb.asIntBuffer();
        mColorBuffer.put(colors);
        mColorBuffer.position(0);

        mIndexBuffer = ByteBuffer.allocateDirect(indices.length);
        mIndexBuffer.put(indices);
        mIndexBuffer.position(0);
    }
    
    public void centerProp() {
      for (int i= 0; i<8; i++){
        vertices[3*i]   = cubeVertices[3*i] + (int)center.x;
        vertices[3*i+1] = cubeVertices[3*i+1] + (int)center.z;
        vertices[3*i+2] = cubeVertices[3*i+2] + (int)center.y;
      }
    }

    public void draw(GL10 gl)
    {
        mVertexBuffer.put(vertices);
        mVertexBuffer.position(0);
      
        gl.glFrontFace(gl.GL_CW);
        gl.glVertexPointer(3, gl.GL_FIXED, 0, mVertexBuffer);
        gl.glColorPointer(4, gl.GL_FIXED, 0, mColorBuffer);
        gl.glDrawElements(gl.GL_TRIANGLES, 36, gl.GL_UNSIGNED_BYTE, mIndexBuffer);
    }

    private IntBuffer   mVertexBuffer;
    private IntBuffer   mColorBuffer;
    private ByteBuffer  mIndexBuffer;
}