在特定條件下更改對象的紋理

Question

我在Jogl中有紋理問題。我畫一個書架，當檢測到擱板被標記時，紋理應該改變。這是我到目前爲止的代碼：

Texture book; 

    if (Library.touchTime != 0 && Library.marked.equals(name)){ 
     long actTime = System.currentTimeMillis(); 
     if (actTime - Library.touchTime <= 2000){ 
      this.book = books_marked; 
     } 
     else{ 
      Library.touchTime = 0; 
      Library.marked = ""; 
      this.book = books; 
     } 
    } 
    book.enable(); 
    book.bind(); 

//---- front -------------------------------------------------- 
    gl.glBegin(GL.GL_QUADS); 
     normVector = front.getNorm(); 
     gl.glNormal3f(normVector.getX(), normVector.getY(), normVector.getZ()); 
     drawRect(gl, 0, 1, 2, 3); 
    gl.glEnd(); 

對象書籍和books_marked是構造函數的參數，這樣創建：

// ---- Load Book Texture ----------------------------------------------- 
    try { 
     InputStream stream = getClass().getResourceAsStream("books.jpg"); 
     data = TextureIO.newTextureData(stream, false, "jpg"); 
     books = TextureIO.newTexture(data); 
    } catch (IOException e) { 
     e.printStackTrace(); 
     System.exit(1); 
    } 

// ------------------------------------------------------------- 
// ---- Load Book_marked Texture ------------------------------------- 
    try { 
     InputStream stream = getClass().getResourceAsStream("books_marked.jpg"); 
     data = TextureIO.newTextureData(stream, false, "jpg"); 
     books_marked = TextureIO.newTexture(data); 
    } catch (IOException e) { 
     e.printStackTrace(); 
     System.exit(1); 
    } 

// -------------------------------------------------------------------------  

我的意圖是在如果中實例化的書紋理對象條件，以便bind（）命令將自動綁定正確的圖片。但紋理不會改變。有沒有人知道我在這裏弄錯了什麼？

Answer 1

調用Texture.bind（GL）或glBindTexture。