mycube.java

来自「基于ANdroid平台的高欢堂书籍的对应源代码 非常有用」· Java 代码 · 共 121 行

package com.misoo.ppxx;

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

import javax.microedition.khronos.opengles.GL10;


class MyCube
{
	private int mTriangles;
    public MyCube(byte [] indices)
    {
        int one = 0x10000;
        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,    0,  one,  one,
                  0,  one,    0,  one,
                  0,    0,  one,  one,
                one,  one,    0,  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
        };
/*
       
        byte indices[] = {
                4, 0, 5,    1, 5, 0,
                2, 3, 7,    6, 2, 7,
             };
  	
        byte indices[] = {
                 /*    		
             		6, 0, 1,
             		2, 1, 0,
             		1, 2, 6,
             		0, 6, 2,
             		6, 7, 5,
             		4, 5, 7,
             		*/
     /*   		
        		6, 0, 1,
        		5, 1, 0,
         		1, 5, 6,
         		0, 6, 5,
       */  		
         		
         		
         		
         		/*
         		6, 0, 1,
         		2, 1, 0,
         		1, 2, 6,
         		0, 6, 2,
         		*/
       //      };
/*
        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
        };
  */      
    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);
	mTriangles = indices.length;
    }
    
    @SuppressWarnings("static-access")
	public void draw(GL10 gl)
    {
        gl.glFrontFace(GL10.GL_CW);
        gl.glVertexPointer(3, gl.GL_FIXED, 0, mVertexBuffer);
        gl.glColorPointer(4, gl.GL_FIXED, 0, mColorBuffer);
        gl.glDrawElements(gl.GL_TRIANGLES, mTriangles, gl.GL_UNSIGNED_BYTE, mIndexBuffer);
    }
    
    private IntBuffer   mVertexBuffer;
    private IntBuffer   mColorBuffer;
    private ByteBuffer  mIndexBuffer;
}