JOGL 第5课 纹理(bmp)

底下是第1~5课的
全部代码Eclipse 3.2下测试成功

这课是我根据Pepe & Lizzie’s Adventures第6课Texture mapping
结合第4课写的
1.首先要引入3个文件：BitmapLoader.java
                  功能：负责读取bmp图片(只对8位和24位)转化为BufferedImage
                   ResourceRetriever.java
                   功能：读取资源从jar包或当前路径
                        也就是针对java中读取文件时要使用绝对路径的问题
                   TextureReader.java
                   功能：把BufferedImage转化为使OpenGL容易识别的数据结构
2.包含TextureReader.java 用于载入bmp图片
import common.TextureReader;
3.包含私有成员
  private float xrot;//绕X轴
  private float yrot;//绕Y轴
  private float zrot;//绕Z轴
 
  private int texture;//纹理

4.在init(GLAutoDrawable drawable)方法里面添加

  //--------------新添加代码-------
    gl.glEnable(GL.GL_TEXTURE_2D);//启动纹理映射
    texture = genTexture(gl);//返回操作的未被使用的纹理对象的索引
    gl.glBindTexture(GL.GL_TEXTURE_2D, texture);//指定和绑定纹理(这里是绑定纹理)
    TextureReader.Texture texture1 = null;
    try {
    texture1 = TextureReader.readTexture("data/Crate.bmp");//bmp图片
    //texture1 = TextureReader.readTexture("data/glass.png");
    } catch (IOException e) {
        e.printStackTrace();
        throw new RuntimeException(e);
    }
   
    glu.gluBuild2DMipmaps(GL.GL_TEXTURE_2D, GL.GL_RGB8, texture1.getWidth(), texture1.getHeight(), GL.GL_RGB, GL.GL_UNSIGNED_BYTE, texture1.getPixels());
    gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);
    gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
    //--------------
   
5.在类中添加一个方法
     //--------------新添加代码------------
     //返回操作的未被使用的纹理对象的索引
  private int genTexture(GL gl) {
      final int[] tmp = new int[1];
      gl.glGenTextures(1, tmp, 0);
      return tmp[0];
  }
 
6.display方法的全部代码
  //-----------------------
  public void display(GLAutoDrawable drawable)
  {
GL gl = drawable.getGL();
gl.glClear(GL.GL_COLOR_BUFFER_BIT|GL.GL_DEPTH_BUFFER_BIT);    //清除颜色缓冲
gl.glLoadIdentity();    //重置矩阵
gl.glTranslatef(0.0f, 0.0f, -6.0f);    //向内(Z轴负方向)移动6
    gl.glTranslatef(0.0f, 0.0f, -6.0f);    //向内(Z轴负方向)移动6
   
    gl.glRotatef(xrot, 1.0f, 0.0f, 0.0f);
    gl.glRotatef(yrot, 0.0f, 1.0f, 0.0f);
    gl.glRotatef(zrot, 0.0f, 0.0f, 1.0f);

    gl.glBindTexture(GL.GL_TEXTURE_2D, texture);//指定和绑定纹理(这里是指定纹理)

    gl.glBegin(GL.GL_QUADS);
    // 前面
    gl.glTexCoord2f(0.0f, 0.0f);gl.glVertex3f(-1.0f, -1.0f, 1.0f);
    gl.glTexCoord2f(1.0f, 0.0f);gl.glVertex3f(1.0f, -1.0f, 1.0f);
    gl.glTexCoord2f(1.0f, 1.0f);gl.glVertex3f(1.0f, 1.0f, 1.0f);
    gl.glTexCoord2f(0.0f, 1.0f);gl.glVertex3f(-1.0f, 1.0f, 1.0f);
    // 后面
    gl.glTexCoord2f(1.0f, 0.0f);gl.glVertex3f(-1.0f, -1.0f, -1.0f);
    gl.glTexCoord2f(1.0f, 1.0f);gl.glVertex3f(-1.0f, 1.0f, -1.0f);
    gl.glTexCoord2f(0.0f, 1.0f);gl.glVertex3f(1.0f, 1.0f, -1.0f);
    gl.glTexCoord2f(0.0f, 0.0f);gl.glVertex3f(1.0f, -1.0f, -1.0f);
    // 上面
    gl.glTexCoord2f(0.0f, 1.0f);gl.glVertex3f(-1.0f, 1.0f, -1.0f);
    gl.glTexCoord2f(0.0f, 0.0f);gl.glVertex3f(-1.0f, 1.0f, 1.0f);
    gl.glTexCoord2f(1.0f, 0.0f);gl.glVertex3f(1.0f, 1.0f, 1.0f);
    gl.glTexCoord2f(1.0f, 1.0f);gl.glVertex3f(1.0f, 1.0f, -1.0f);
    // 下面
    gl.glTexCoord2f(1.0f, 1.0f);gl.glVertex3f(-1.0f, -1.0f, -1.0f);
    gl.glTexCoord2f(0.0f, 1.0f);gl.glVertex3f(1.0f, -1.0f, -1.0f);
    gl.glTexCoord2f(0.0f, 0.0f);gl.glVertex3f(1.0f, -1.0f, 1.0f);
    gl.glTexCoord2f(1.0f, 0.0f);gl.glVertex3f(-1.0f, -1.0f, 1.0f);
    // 右面
    gl.glTexCoord2f(1.0f, 0.0f);gl.glVertex3f(1.0f, -1.0f, -1.0f);
    gl.glTexCoord2f(1.0f, 1.0f);gl.glVertex3f(1.0f, 1.0f, -1.0f);
    gl.glTexCoord2f(0.0f, 1.0f);gl.glVertex3f(1.0f, 1.0f, 1.0f);
    gl.glTexCoord2f(0.0f, 0.0f);gl.glVertex3f(1.0f, -1.0f, 1.0f);
    // 左面
    gl.glTexCoord2f(0.0f, 0.0f);gl.glVertex3f(-1.0f, -1.0f, -1.0f);
    gl.glTexCoord2f(1.0f, 0.0f);gl.glVertex3f(-1.0f, -1.0f, 1.0f);
    gl.glTexCoord2f(1.0f, 1.0f);gl.glVertex3f(-1.0f, 1.0f, 1.0f);
    gl.glTexCoord2f(0.0f, 1.0f);gl.glVertex3f(-1.0f, 1.0f, -1.0f);
   
    gl.glEnd();

    xrot += 0.3f;
    yrot += 0.2f;
    zrot += 0.4f;

  }