On Saturday, 3 September 2016 at 11:13:30 UTC, Lodovico Giaretta
wrote:
Ah! Well, providing error messages is always useful. Now I see
your issue: your callback has D linkage, but OpenGL expects a
function with C linkage. So you have to put `extern(C)` on your
callback declaration.
Well, it's GLFW, not OpenGL, but yes they do need to be extern
(C) and also nothrow, as that is how the callback types are
declared in Derrlict:
```
extern(C) nothrow
void key_callback(GLFWwindow* window, int key, int scancode, int
action, int mode) {
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
}
```
