Question

So this one is a doozie;
I’ve got a pretty large OpenGL solution, written in version 3.2 core with GLSL 1.5 in Windows 7. I am using GLEW and GLM as helper libraries. When I create a window, I am using the following lines:

// Initialize main window
glewExperimental = GL_TRUE;
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3); // Use OpenGL Core v3.2
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2);
glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
if(!glfwOpenWindow(Game::WINDOW_X, Game::WINDOW_Y, 0, 0, 0, 0, 32, 0, GLFW_WINDOW))
{ ...

If I omit the three glfwOpenWindowHint functions, the application crashes my video drivers upon call to glDrawArrays(GL_TRIANGLES, 0, m_numIndices);

But here’s the kicker. When someone else in my group tries to update and run the solution, they get a blank window with no geometry. Commenting out the three lines makes the program run fine for them. There is a pretty even split between working with the 3.2core hint and without. I haven’t been able to determine any difference between nVidia, AMD, desktop, or laptop.

The best I could find was a suggestion to add glewExperimental = GL_TRUE; as Glew is said to have problems with core. It made no difference. The solution is too big to post code, but I can put up shaders, rendering code, etc as needed.

Thanks so much! This has been killing us for several days now.

Answer 1

Try asking for a forward-compatible GLFW window:

GLFW_OPENGL_FORWARD_COMPAT – Specify whether the OpenGL contextshould be forward-compatible (i.e. disallow legacy functionality). This should only beused when requesting OpenGL version 3.0 or above.

And try not setting the profile hint and let the system choose:

// Use OpenGL Core v3.2
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2);
glfwOpenWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

Also, make sure that you actually get a version you want:

int major, minor, rev;

glfwGetGLVersion(&major, &minor, &rev);

fprintf(stderr, "OpenGL version recieved: %d.%d.%d", major, minor, rev);

---

Not sure whether you also run for Macs, but read this anyway:

A.4 OpenGL 3.0+ on Mac OS X

Support for OpenGL 3.0 and above was introduced with Mac OS X 10.7,
and even then forward-compatible OpenGL 3.2 core profile contexts are
supported and there is no mechanism for requesting debug contexts.
Earlier versions of Mac OS X supports at most OpenGL version 2.1.

Because of this, on Mac OS X 10.7, the GLFW_OPENGL_VERSION_MAJOR and
GLFW_OPENGL_VERSION_MINOR hints will fail if given a version above
3.2, the GLFW_OPENGL_DEBUG_CONTEXT and GLFW_FORWARD_COMPAT hints are ignored, and setting the GLFW_OPENGL_PROFILE hint to anything except
zero or GLFW_OPENGL_CORE_PROFILE will cause glfwOpenWindow to fail.

Also, on Mac OS X 10.6 and below, the GLFW_OPENGL_VERSION_MAJOR and
GLFW_OPENGL_VERSION_MINOR hints will fail if given a version above
2.1, the GLFW_OPENGL_DEBUG_CONTEXT hint will have no effect, and setting the GLFW_OPENGL_PROFILE or GLFW_FORWARD_COMPAT hints to a
non-zero value will cause glfwOpenWindow to fail.