Hi Dave,
I'm afraid this can't be done from MacRuby at the moment, and that the
Objective-C wrapper is the best solution so far.
However, if this is a common OpenGL function, maybe we need to find a solution
for 1.0… consider filing a ticket.
Laurent
On Jan 10, 2011, at 5:42 AM, Dave Baldwin wrote:
> 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.
>
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