Android Open Source - NotATop Texture Rect

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Back to project page NotATop.

License

The source code is released under:

GNU General Public License

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Java Source Code

package com.gg.util;
// ww w  .j a v a  2  s .  com
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import javax.microedition.khronos.opengles.GL10;

public class TextureRect {

  private float TABLE_UNIT_SIZE = 0.5f;
  private float TABLE_UNIT_HIGHT = 0.5f;
  
  private FloatBuffer   mVertexBuffer;//???????????????
    private FloatBuffer mTextureBuffer;//???????????????
    int vCount=0;
    int texId;
    
    public TextureRect(float width,float height, float length,int texId,float[] texST)
    {
      this.texId=texId;
      //?????????????????================begin============================
        vCount=6;
        float vertices[]=new float[]
        {
          -width*TABLE_UNIT_SIZE,height*TABLE_UNIT_HIGHT,-length*TABLE_UNIT_SIZE,
          -width*TABLE_UNIT_SIZE,-height*TABLE_UNIT_HIGHT,length*TABLE_UNIT_SIZE,     
          width*TABLE_UNIT_SIZE,-height*TABLE_UNIT_HIGHT,length*TABLE_UNIT_SIZE,
          
          width*TABLE_UNIT_SIZE,-height*TABLE_UNIT_HIGHT,length*TABLE_UNIT_SIZE,
          width*TABLE_UNIT_SIZE,height*TABLE_UNIT_HIGHT,-length*TABLE_UNIT_SIZE,     
          -width*TABLE_UNIT_SIZE,height*TABLE_UNIT_HIGHT,-length*TABLE_UNIT_SIZE,
        };
    
        //???????????????????
        //vertices.length*4??????????????????
        ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
        vbb.order(ByteOrder.nativeOrder());//??????????
        mVertexBuffer = vbb.asFloatBuffer();//????Float?????
        mVertexBuffer.put(vertices);//????????????????????
        mVertexBuffer.position(0);//??????????????
        //?????????????????????????????????????????????ByteBuffer
        //??????????????ByteOrder????nativeOrder()?????????????????
        //?????????????????================end============================
        ByteBuffer tbb = ByteBuffer.allocateDirect(texST.length*4);
        tbb.order(ByteOrder.nativeOrder());//??????????
        mTextureBuffer = tbb.asFloatBuffer();//????int?????
        mTextureBuffer.put(texST);//???????????????????
        mTextureBuffer.position(0);//??????????????         
        
    }

    public void drawSelf(GL10 gl)
    {        
        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);//??????????????
        
    //????????????????????
        gl.glVertexPointer
        (
            3,        //????????????????3  xyz 
            GL10.GL_FLOAT,  //???????????????? GL_FLOAT
            0,         //??????????????????????
            mVertexBuffer  //????????????
        );
        
        //????????
        gl.glEnable(GL10.GL_TEXTURE_2D);   
        //???????????ST??????
        gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
        //????????????ST??????
        gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, mTextureBuffer);
        //????????
        gl.glBindTexture(GL10.GL_TEXTURE_2D, texId);
        
    
        //???????
        gl.glDrawArrays
        (
            GL10.GL_TRIANGLES,     //?????????????
            0,              //???????
            vCount          //?????????
        );
    }
}

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