[MacRuby-devel] Initializing Pointer.new with specific value

[Laurent Sansonetti]

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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> MacRuby-devel at lists.macosforge.org
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