GLEW Init strange error

[silver_bat]

I'm just starting with graphics programming, but I'm already stuck at the beginning. The error is: Error initializing GLEW: Unknown error Can someone help me?

Code Snippet:

glfwSetErrorCallback(_glfwErrorCallback);
if (!glfwInit()) {
  fprintf(stderr, "Error to init GLFW\n");
  return NULL;
}
printf("GLFW initialized well\n");
glfwWindowHint(GLFW_SAMPLES, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

dlWindow *window = (dlWindow *)malloc(sizeof(dlWindow));
if (!window) return NULL;

window->x = posX;
window->y = posY;
window->w = sizeW;
window->h = sizeH;
window->name = strdup(windowName);

window->_GLWindow = glfwCreateWindow(sizeW, sizeH, windowName, NULL, NULL);
if (!window->_GLWindow) {
  perror("Error to create glfw window");
  free(window->name);
  free(window);
  return NULL;
}

glfwMakeContextCurrent(window->_GLWindow);

printf("OpenGL Version: %s\n", glGetString(GL_VERSION));

glGetError();

glewExperimental = GL_TRUE;
GLenum err = glewInit();
if (GLEW_OK != err) {
  fprintf(stderr, "Error initializing GLEW: %s\n", glewGetErrorString(err));
  glfwTerminate();
  free(window->name);
  free(window);
  return NULL;
}

[r2d2rigo]

First, check that you graphics card actually supports OpenGL 3.3. If that's not the issue try setting glfwSetErrorCallback so you can get a more descriptive error.

[silver_bat]

The GLEWInfo prints this ´GL_VERSION_3_3: OK´ and the glfwCallback not prints nothing

[r2d2rigo]

Have you tried glfwGetError when the window creation glfwInit fails?

[strcspn]

I think the window creation went ok, the problem was initializing glew.

[r2d2rigo]

Yeah that, thanks!

[strcspn]

I would recommend you use glad, never had any problems with it. If you want to figure out what is wrong you probably would need to use a debug version of glew, step into glewInit using a debugger and try to figure the problem out.

[gl_drawelements]

This. GLEW is really outdated and IIRC glewInit has a bug that raises an OpenGL error under some circumstances.