Hi I started today to make an OpenGL program, I made the shader class, mesh class and texture class. When I tried to test it, it stopped working. After a little debug with Visual Studio(thanks Microsoft for this useful tool). It showed me that my problem is:

glGenVertexArrays(1, &m_vao);

I use glew. I searched on internet, and I found that glewExperimental needs to be GL_TRUE, so I init it like this:

glewExperimental = GL_TRUE;
GLenum error = glewInit();
if (error != GLEW_OK)
    std::cerr << "Glew: " << glewGetErrorString(error);

nothing changed.

Error given by Visual Studio:

Exception thrown at 0x00000000 in DirtyCraft.exe: 0xC0000005: Access violation executing location 0x00000000. occurred

I do use Glew 2.0.0, 32-bits, SDL2.

If you need any additional information, feel free to request them.

  • \$\begingroup\$ (1) what graphics hardware have you? (2) did you call glewInit before or after creating your GL context? \$\endgroup\$ Commented Jul 31, 2017 at 18:16
  • \$\begingroup\$ I have a gtx 950, and glewInit is called after context creation, it's the last part of the window constructor \$\endgroup\$ Commented Jul 31, 2017 at 18:42
  • \$\begingroup\$ Thanks. Are you able to create shaders and buffers or do you crash on those too? Rearrange some code if necessary. Right now it seems as though you're not getting a hardware-accelerated GL context. \$\endgroup\$ Commented Jul 31, 2017 at 20:13
  • \$\begingroup\$ I'm not at my pc, but it could be a problem of linking? \$\endgroup\$ Commented Jul 31, 2017 at 22:01
  • \$\begingroup\$ Btw, shaders works, not tested them, but I saw compile errors. \$\endgroup\$ Commented Jul 31, 2017 at 22:01

1 Answer 1


The Window that holds the rendering must be opened first. Also, you need to call glew first before calling any opengl functions.

  • 1
    \$\begingroup\$ thank you, but I solved. Somehow glDrawElements was messing up something in glew, so I reinstalled glew \$\endgroup\$ Commented Aug 9, 2017 at 19:46

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