Re: [gl4java-usergroup] Stencil buffers?

[Pontus L. <po...@ly...>]

On Wed, 26 Jan 2000, Sven Goethel wrote:

> Now I have tested the Method glGetIntegerv(GL_STENCIL_BITS,...) 
> with GL4Java Version 2.1.3.2 and:
> 
> 	- WinNT 4.0 + Matrox G200 OpenGL
>          	Stencil bits are 8
>          	Color bits are 5
> 	- WinNT 4.0 + NVidia GeForce256 + Elsa X2 OpenGL Driver
>          	Stencil bits are 0
>          	Color bits are 5
> 	- Linux + NVidia GeForce256 + NVidia GLX 1.2 Mesa 3.0 OpenGL Driver
>          	Stencil bits are 0
>          	Color bits are 5
> 	- Linux + Mesa 3.1 Soft OpenGL Driver
>          	Stencil bits are 0
>          	Color bits are 5
> 
> So I guess it is about the Stencil capabilities of the gfx-card and the
> driver.
> I guess the Method glGetIntegerv(GL_STENCIL_BITS,...) is OpenGL1.2 only
> - right ?
> Or should we enable Stencil with glEnable(GL_STENCIL...) ?
> 
> But it is not a bug in GL4Java !

In the example stencil.c that comes with the Mesa distribution, there is
an example of having an 8 bit stencil buffer. However, the example calls
glutInitDisplay(GLUT_RGB|GLUT_SINGLE|GLUT_STENCIL), so I guess one must do
some initialization, as you say with glEnable(GL_STENCIL). You could
implement it the same way as the current "doubleBuffer=true", i.e.,
"stencilBuffer=true" in the users' preInit() method.

Regards,

Pontus

-- 
Pontus Lidman, po...@ma..., Software Engineer
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