调用glBufferData（）时出现随机的“未处理的异常”

Question

I have some OpenGL code that runs perfectly, but every now and then (about every fifth time or so) when I try to launch the program, it crashes with unhandled exception:

Unhandled exception at 0x5CE5F86E (atioglxx.dll) in Main.exe: 0xC0000005:
Access violation reading location 0x07388000.

The line it points to is just a simple glBufferData() call:

glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indices.size() * sizeof(GLuint), &m_indices[0], GL_STATIC_DRAW);

Is there something I can do about it? Or is it a graphics driver problem? I do have the latest drivers installed (the card is Radeon 290X). The crash is really inconsistent; without any changes, if I just keep launching the program, it usually takes a couple of times before it does this.

Answer 1

From your comments it seems that you have a type size mismatch, change your call to

lBufferData(
  GL_ELEMENT_ARRAY_BUFFER, 
  m_indices.size() * sizeof m_indices[0], 
  m_indices.data(),
  GL_STATIC_DRAW
);

You could also use a small helper function like the following to cut down on the crud (which helps avoid bugs like this)

template<typename T, typename Allocator>
size_t sizeof_vec(std::vector<T, Allocator> const& v)
{
  return v.size() * sizeof(T);
}

lBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof_vec(m_indices), m_indices.data(), GL_STATIC_DRAW);