glBufferData()的分段错误

问题描述

我无法弄清楚这段代码为什么会出错:

I can't work out why this code is seg faulting:

AxesMarker::AxesMarker(float size)
    : size_(size), vbo_vertices_(0), vbo_elements_(0)
{
  Vertex vertices[6] = {
      Vertex(Color4f::RED, Vector3f::ZERO, Vector3f::ZERO),
      Vertex(Color4f::RED, Vector3f::ZERO, Vector3f(size_, 0.0f, 0.0f)),
      Vertex(Color4f::BLUE, Vector3f::ZERO, Vector3f::ZERO),
      Vertex(Color4f::BLUE, Vector3f::ZERO, Vector3f(0.0f, size_, 0.0f)),
      Vertex(Color4f::GREEN, Vector3f::ZERO, Vector3f::ZERO),
      Vertex(Color4f::GREEN, Vector3f::ZERO, Vector3f(0.0f, size_, 0.0f)) };

  GLuint elements[6] = { 0, 1, 2, 3, 4, 5 };

  fprintf(stderr, "sizeof(vertices): %d, sizeof(Vertex): %d", (int) sizeof(vertices), (int) sizeof(Vertex));

  /* create buffers */
  glGenBuffers(1, &vbo_vertices_);
  glGenBuffers(1, &vbo_elements_);

  /* bind buffers */
  glBindBuffer(GL_ARRAY_BUFFER, vbo_vertices_);
  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo_elements_);

  /* buffer data */
  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(elements), elements, GL_STATIC_DRAW);

  /* unbind buffers */
  glBindBuffer(GL_ARRAY_BUFFER, 0);
  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}

编译时没有警告，但在第一次调用glBufferData()时似乎出现段错误.如果需要，我可以发布更多代码，因为我对GL不够熟悉，无法知道可能有什么相关之处.谢谢！

Compiles with no warnings, but appears to be seg faulting on the first call to glBufferData().I can post more code if necessary, I'm not familiar enough with GL to know what might be relevant.Thanks!

  GLfloat vertices[60] = {
     1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
     1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
     0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
     0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f,
     0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
     0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f };

产生相同的段错误.

推荐答案

您的Vertex类是普通的旧数据类型吗?它是否具有任何虚拟功能，这可能意味着它还具有一个vtable?您是否可以尝试使用普通浮点数数组重写此代码(只是为了测试对glBufferData的调用是否正常).据我所知，看起来您正确使用了glBufferData，但是我可能又错过了一些东西.

Is your Vertex class a plain old data type? Does it have any virtual functions which might mean it also has a vtable? Can you try re-writing this code using an array of plain floats,(just to test your calls to glBufferData are working). From what I can tell though, it looks like you are using glBufferData correctly, but then again I might have missed something.

在调用此代码之前，您是否完全确定OpenGL上下文已完全初始化.这是一个全局对象，因为它的构造函数可能在main之前被调用?

Did you make absolutely sure that your OpenGL context is fully initialised before you call this code. Is this a global object, because it's constructor might be called before main?

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