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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