Re: Using OpenGL

[Lodovico Giaretta via Digitalmars-d-learn]

On Saturday, 3 September 2016 at 11:10:00 UTC, Darren wrote:
On Saturday, 3 September 2016 at 11:02:11 UTC, Lodovico 
Giaretta wrote:
//glfwSetKeyCallback(window, key_callback);

glfwSetKeyCallback(window, &key_callback);

I actually tried this before but it doesn't work.  I get the 
following error:

Error: function pointer glfwSetKeyCallback (GLFWwindow*, extern 
(C) void function(GLFWwindow*, int, int, int, int) nothrow) is 
not callable using argument types (GLFWwindow*, void 
function(GLFWwindow* window, int key, int scancode, int action, 
int mode))

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.