Re: [Vala] Allow passing ref/out as a pointer.

[Tal Hadad <tal_hd hotmail com>]

Thanks, but this code doesn't work either:
GLuint[2] a = {20000,50000};
glGenBuffers (2, &a[0]);
stdout.printf ("Buffers: " + ((uint)a[0]).to_string () + ", "+ ((uint)a[1]).to_string () + "\n");
...
public extern void glGenBuffers (GLsizei n, GLuint * ids);

Output(same):
Buffers: 20000, 50000

Someone knows why?

Thanks
Tal

> Subject: Re: [Vala] Allow passing ref/out as a pointer.
> From: sergej reich googlemail com
> To: tal_hd hotmail com
> CC: vala-list gnome org
> Date: Sun, 15 Apr 2012 12:17:15 +0200
>
> I've written a vapi for GLEW that addresses most of the issues the GL
> vapi has. In the end I ended up using pointers everywhere since it's
> much simpler.
> I've used it in my projects for a while now, if you want I can put it up
> somewhere.
>
> Am Sonntag, den 15.04.2012, 12:53 +0300 schrieb Tal Hadad:
> > Luca, when I test it now I get that the method don't do anything (and
> > it should).
> > Test code:
> > GLuint[2] a = {20000,50000};
> > glGenBuffers (a);
> > stdout.printf ("Buffers: " + ((uint)a[0]).to_string () + ", "+ ((uint)a[1]).to_string () + "\n");
> > ....
> > public extern void glGenBuffers ([CCode (array_length_pos = 0.1)] GL.GLuint[] buffers);
> >
> > And output:
> > Buffers: 20000, 50000
> >
> > So it seems that it don't do anything, when it should change values.
> > My OpenGL hardware&drivers are fine.
> > The other GL code in my program display a simple triangle that
> > works 100%, and so is Compiz Fusion.
> >
> > Do you know what is the problem?
> >
> > Tal
> >
> > Date: Sun, 15 Apr 2012 11:26:41 +0200
> > Subject: Re: [Vala] Allow passing ref/out as a pointer.
> > From: lethalman88 gmail com
> > To: tal_hd hotmail com
> > CC: vala-list gnome org
> >
> > 2012/4/15 Tal Hadad <tal_hd hotmail com>
> >
> >
> >
> >  There's two GL vapis in ExternalBinding page. I'm talking about
> >
> > the one inside the brackets[0]. This is part of the vapi:
> >
> > public static void glGenBuffers (GL.GLsizei n, [CCode (array_length = false, array_null_terminated = 
> > true)] out unowned GL.GLuint[] buffers);
> >
> > public static void glDeleteBuffers (GL.GLsizei n, [CCode (array_length = false, array_null_terminated = 
> > true)] GL.GLuint[]? buffers);
> >
> >
> >
> > The GL C API is:
> >
> > void glGenBuffers (GLsize n, GLuint *buffers)
> >
> > void glDeleteBuffers (GLsize n, GLuint *buffers)
> >
> >
> >
> > Which n is the count of buffers, and buffers represent a pointer
> >
> > to the first element.
> >
> >
> >
> > The generation of method glGenBuffers is completely buggy (i.e.
> >
> > failed even if I pass an GL.GLuint[] array).
> >
> > However, the generation of the second method is OK.
> >
> >
> >
> > Take a look at the first method. What the parameter should be?
> >
> > Is it should be "out GL.GLuint first_element"?
> >
> > public static void glGenBuffers ([CCode (array_length_pos = 0.1)] GL.GLuint[] buffers);
> > public static void glDeleteBuffers ([CCode (array_length_pos = 0.1)] GL.GLuint[] buffers);
> >
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