java - JOGL glBufferData与glVertexAttribPointer不起作用

我对glBufferData和glVertexAttribPointer有问题。由于某种原因，他们只是不能一起工作。这是代码：

    float[] triangleArray = {
            -1.0f, -1.0f, 0.0f,
            1.0f, -1.0f, 0.0f,
            0.0f, 1.0f, 0.0f
    };

    IntBuffer vacantNameBuffer = IntBuffer.allocate(2);
    gl.glGenBuffers(1, vacantNameBuffer);
    int bufferIndex = vacantNameBuffer.get();

    FloatBuffer triangleVertexBuffer = Buffers.newDirectFloatBuffer(triangleArray);
    gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, bufferIndex);
    IntBuffer paramBuffer = IntBuffer.allocate(2);
    gl.glGetBufferParameteriv(GL2.GL_ARRAY_BUFFER, GL2.GL_BUFFER_SIZE, paramBuffer);
    System.out.println(paramBuffer.get());
    int triangleBufferSize = triangleVertexBuffer.capacity() * Buffers.SIZEOF_FLOAT;
    gl.glBufferData(
            GL2.GL_ARRAY_BUFFER,
            triangleBufferSize,
            triangleVertexBuffer,
            GL2.GL_STATIC_DRAW);
    gl.glGetBufferParameteriv(GL2.GL_ARRAY_BUFFER, GL2.GL_BUFFER_SIZE, paramBuffer);
    System.out.println(paramBuffer.get());
    gl.glEnableVertexAttribArray(0);
    gl.glVertexAttribPointer(
            0,
            3,
            GL2.GL_FLOAT,
            false,
            0,
            0);
    gl.glDrawArrays(GL2.GL_TRIANGLES, 0, 3);
    gl.glDisableVertexAttribArray(0);

但是，这很完美：

    float[] triangleArray = {
            -1.0f, -1.0f, 0.0f,
            1.0f, -1.0f, 0.0f,
            0.0f, 1.0f, 0.0f
    };

    FloatBuffer triangleVertexBuffer = Buffers.newDirectFloatBuffer(triangleArray);
    /*
    IntBuffer vacantNameBuffer = IntBuffer.allocate(2);
    gl.glGenBuffers(1, vacantNameBuffer);
    int bufferIndex = vacantNameBuffer.get();
    gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, bufferIndex);
    IntBuffer paramBuffer = IntBuffer.allocate(2);
    gl.glGetBufferParameteriv(GL2.GL_ARRAY_BUFFER, GL2.GL_BUFFER_SIZE, paramBuffer);
    System.out.println(paramBuffer.get());
    int triangleBufferSize = triangleVertexBuffer.capacity() * Buffers.SIZEOF_FLOAT;
    gl.glBufferData(
            GL2.GL_ARRAY_BUFFER,
            triangleBufferSize,
            triangleVertexBuffer,
            GL2.GL_STATIC_DRAW);
    gl.glGetBufferParameteriv(GL2.GL_ARRAY_BUFFER, GL2.GL_BUFFER_SIZE, paramBuffer);
    System.out.println(paramBuffer.get());
    */
    gl.glEnableVertexAttribArray(0);
    gl.glVertexAttribPointer(
            0,
            3,
            GL2.GL_FLOAT,
            false,
            0,
            triangleVertexBuffer);
    gl.glDrawArrays(GL2.GL_TRIANGLES, 0, 3);
    gl.glDisableVertexAttribArray(0);

如果有人愿意指出我的代码为什么不起作用。我会很感激。

最佳答案

我发现了问题，这不是我的代码，而是由于jogl的局限性要求使用gl shader程序。
在此职位上找到答案：glDrawArrays() behaving weirdly on Mac OS X;