Android中的渲染效率 - OpenGL ES 10

Question

當前編寫的代碼在OpenGL（）10中創建背景和3D對象。我已經遇到了一個問題，雖然在更改單位矩陣後渲染對象。無論出於何種原因，代碼效率非常低，並且對象不會平穩移動，它會跳出一些零碎的東西。

public void onDrawFrame(GL10 gl) { 
    // Clear the screen to black 
    gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); 
    background.loadTexture(gl, mContext, R.drawable.room); 
    // Position model so we can see it 
    gl.glMatrixMode(GL10.GL_MODELVIEW); 
    gl.glLoadIdentity(); 
    gl.glTranslatef(0, 0, -20.0f); 
    gl.glScalef(7.5f, 7.5f, 0); 

    //gl.glTranslatef(tempX, tempY, 0); 

    //Set rotation 
    gl.glRotatef(0, 0, 0, 0); //glRotatef(angle, x, y, z) rotates each axis by a certain angle 
    background.draw(gl); 

    // Position model so we can see it 
    gl.glMatrixMode(GL10.GL_MODELVIEW); 
    gl.glLoadIdentity(); 
    gl.glTranslatef(tempX, tempY, -10f); 

    gl.glScalef(counter*1f,counter*1f,counter*1f); 
    System.out.println("Z value is now 1f*"+counter+" and tempX is "+tempX+" and tempY is "+tempY +"*****************************"); 
    gl.glPushMatrix(); 

    //gl.glTranslatef(tempX, tempY, 0); 

    //Set rotation 
    gl.glRotatef(-60, 1, 1, 0); //glRotatef(angle, x, y, z) rotates each axis by a certain angle 

    cube.loadTexture(gl, mContext, R.drawable.wood); 
    // Draw the model 
    cube.draw(gl); 
} 

立方體類如下所示：

class MyCube { 
    private final IntBuffer vertexBuffer;   //Buffers store vertex data for improved performance 
    private final IntBuffer textureBuffer;   //Buffers store texture data for improved performance 
    static int one = 65536;       //Length of a side 
    int half = one/2; 

//Cube data 
public MyCube() { 

    int vertices[] = {       //Sets coordinates of the vertices. 
      // FRONT 
      -half, -half, half, half, -half, half, //Sets x, y and z coordinates for each of the four vertices of the front face 
      -half, half, half, half, half, half, 
      // BACK 
      -half, -half, -half, -half, half, -half, 
      half, -half, -half, half, half, -half, 
      // LEFT 
      -half, -half, half, -half, half, half, 
      -half, -half, -half, -half, half, -half, 
      // RIGHT 
      half, -half, -half, half, half, -half, 
      half, -half, half, half, half, half, 
      // TOP 
      -half, half, half, half, half, half, 
      -half, half, -half, half, half, -half, 
      // BOTTOM 
      -half, -half, half, -half, -half, -half, 
      half, -half, half, half, -half, -half,}; 

    int texCoords[] = {        //Sets values of texture coordinates. (Only u and v. Not x, y, and z.) 
      // FRONT 
      0, one, one, one, 0, 0, one, 0, 
      // BACK 
      one, one, one, 0, 0, one, 0, 0, 
      // LEFT 
      one, one, one, 0, 0, one, 0, 0, 
      // RIGHT 
      one, one, one, 0, 0, one, 0, 0, 
      // TOP 
      one, 0, 0, 0, one, one, 0, one, 
      // BOTTOM 
      0, 0, 0, one, one, 0, one, one,}; 

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

    ByteBuffer tbb = ByteBuffer.allocateDirect(vertices.length * 4); 
    tbb.order(ByteOrder.nativeOrder()); 
    textureBuffer = tbb.asIntBuffer(); 
    textureBuffer.put(texCoords); 
    textureBuffer.position(0); 
} 

//Draws cube 
public void draw(GL10 gl) { 
    gl.glVertexPointer(3, GL10.GL_FIXED, 0, vertexBuffer);   //glVertexPointer(size (number coords per vertex), type (data type of coords, stride (byte offset between consecutive vertices), pointer (pointer to first coord in the array) 

    gl.glEnable(GL10.GL_TEXTURE_2D); // workaround bug 3623 
    gl.glTexCoordPointer(2, GL10.GL_FIXED, 0, textureBuffer); 


    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);     //Render primitives from array data. (mode (specifies kind of primitives, first (specifies starting index of arrays), count (number of indices to be rendered)) 
    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 4, 4); 
    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 8, 4); 
    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 12, 4); 
    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 16, 4); 
    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 20, 4); 
} 


static void loadTexture(GL10 gl, Context context, int resource) { 
    Bitmap bmp = BitmapFactory.decodeResource(context.getResources(), resource); 
    GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp, 0); 
    gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); 
    gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); 

    bmp.recycle(); 
} 

}

任何有關的代碼的指針？

Answer 1

它看起來像你每幀調用cube.loadTexture（）。這可能非常慢，在初始化期間只做一次就足夠了。

另外，我不確定您是否正確加載紋理。通常，您在加載紋理之前生成紋理ID（使用glGenTextures）並將其綁定（使用glBindTexture）。你可能也想看看這個問題。