[SDL] [DEMO] Minimal world engine in SDL+OpenGL

[Santeri Hernejärvi]

Daniel Phillips wrote:
> On Wednesday 22 January 2003 22:13, Stacey Keast wrote:
> 
>>On Wed, 2003-01-22 at 13:28, Stacey Keast wrote:
>>
>>>On Wed, 2003-01-22 at 12:20, Daniel Phillips wrote:
>>>
>>>>Nice shooting.  OK, your card doesn't support a 32 bit depth buffer, or
>>>>the driver doesn't.  The (pathetic excuse for) specs on NVidia's site
>>>>say that your gforce4 supports a 32 bit depth buffer, so we've got a
>>>>software problem.
>>>
>>>This is what I do for my nvidia card.. I can do 32 bit stuff with it..
>>>
>>>/etc/XF86Config
>>>---------------
>>
>>Hmm, nm, I can only get up to 24 with your demo.  But I just tested out
>>lesson17 from the OpenGL-intro package and changed everything to 32 bits
>>there and it worked without complaints. (at fullscreen and not)
> 
> 
> All of the the depths you mentioned are color depths, not frame buffer 
> depths.  I don't know what madness the various layers are using to determine 
> which z-buffer depths are available, but I can say it makes very little sense.
> 
> There, now that I have that off my chest, It seems that SDL+OpenGL is only 
> going to start up on a wide range of hardware if you don't specify any 
> GL_SetAttributes at all.  Just comment them all out and I guess it will 
> start, but you will likely have a sucky 16 bit zbuffer.  Please try 
> uncommenting just the SDL_GL_DEPTH_SIZE line to get a 32 bit zbuffer and see 
> if it starts.

You have to request a 24 bit color to get 32 bit depth, and optionally, 
8 bit stencil.

.s - IIRC