glDrawElements crash (OpenGL 3.2 / Windows 7)

Question

I\'m trying to draw a simple quad in OpenGL 3.2 however the application crashes with \"Access violation reading location 0x00000000\" when I call \"glDrawElements\".

Answer 1

You are not allocating enough space for your vertices in your call to glBufferData. You pass sizeof(TexColorVertex) which allocates space for 1 vertex. If you want to draw a quad then you need to allocate space for 4 vertices so you should change your call to glBuffer Data as follows:

glBufferData(GL_ARRAY_BUFFER, 4*sizeof(TexColorVertex), NULL, GL_DYNAMIC_DRAW);

That way when you make your subsequent calls to glBufferSubData you will not be attempting to access GPU memory that is out of range.