OpenGL - How do I fill a buffer with no data?

Question

How do I supply a buffer with a size but no data in OpenGL? I've tried using

glBufferData(target, 0, nullptr, GL_STATIC_DRAW);

but for now I get access violations on drawcall, might be something else.

Is this the right way to do it?

Answer 1

How do I supply a buffer with a size but no data in OpenGL?

You've to pass a certain size (in bytes) to the size parameter, but pass nullptr to data. See glBufferData:

GLsizeiptr size_in_bytes = ...;
glBufferData(target, size_in_bytes, nullptr, GL_STATIC_DRAW);