在jogl中渲染大型VBO对象

Question

I am trying to render large VBO array objects, containing ~700000 values and I have ~1500000 values in my element_array buffer. But what I am getting is a blank screen. On the other hand if I just use only the VAO, my code works correctly. My code is as follows:

    //Data buffers
    FloatBuffer vertexBuffer = GLBuffers.newDirectFloatBuffer(this.coordCount);
    vertexBuffer.put(Vertices);
    vertexBuffer.rewind();

    IntBuffer indexBuffer = GLBuffers.newDirectIntBuffer(this.indexCount);
    indexBuffer.put(index);
    indexBuffer.rewind();

    //setting up the VBO
    int nVBO = 2;
    int[] VBO = new int[nVBO];

    gl.glGenBuffers(nVBO, VBO,0);

    gl.glBindBuffer(GL.GL_ARRAY_BUFFER, VBO[0]);
    gl.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER,VBO[1]);

    gl.glBufferData(GL.GL_ARRAY_BUFFER, this.coordCount*Float.SIZE, vertexBuffer, GL.GL_STATIC_DRAW);
    gl.glBufferData(GL.GL_ELEMENT_ARRAY_BUFFER, this.indexCount*Integer.SIZE, indexBuffer, GL.GL_STATIC_DRAW);

    gl.glBindBuffer(GL.GL_ARRAY_BUFFER, VBO[0]);
    gl.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, VBO[1]);

    gl.glEnableClientState(GLPointerFunc.GL_VERTEX_ARRAY);

    gl.glVertexPointer(3, GL.GL_FLOAT, 0, 0);
    //gl.glVertexPointer(3, GL.GL_FLOAT, 0, vertexBuffer);


    //gl.glDrawArrays(GL.GL_TRIANGLE_STRIP, 0, 4);
    gl.glDrawElements(GL.GL_TRIANGLES, this.indexCount, GL.GL_UNSIGNED_INT, 0);
    //gl.glDrawElements(GL.GL_TRIANGLES, this.indexCount, GL.GL_UNSIGNED_INT, indexBuffer);


    gl.glDisableClientState(GLPointerFunc.GL_VERTEX_ARRAY);
    gl.glBindBuffer(GL.GL_ARRAY_BUFFER, 0);
    gl.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, 0);

Any clues/suggestions on how I can fix this?

Answer 1

Is this code block called each time when the loop runs? If it is, you should divide your vbo phases into different blocks. This sample code may help you how to divide. (In the link that I post, you should just focus initVBO and renderVbo functions) I guess your initializing your vbo's sequentially, which it may make your program unresponsive.