In OpenGL some functions take pointers and these are easily handled via
v = Pointer.new('f', 20)
glVertexPointer(3, GL_FLOAT, 3, v)
(the C prototype is
void glVertexPointer(GLint
size, GLenum
type, GLsizei
stride, const GLvoid *
pointer);
however in some cases this function has been overloaded so you pass in an integer as the last parameter. In C this is easy
glVertexPointer(3, GL_FLOAT, 3, (void *) 12)
but how do I do this with MacRuby Pointer objects? (the source code and googling hasn't helped). I can (and have) written this as an objective-C method and called this method from ruby so I have a workaround. I can understand if this is not possible or desirable from ruby as it is a horrible bit of API design in OpenGL in any case.
Dave.