Eero Pajarre wrote:
>
> I just tried to run my program, which I have developed with
> Win32+Mesa+3dfx, with Win32+Nvidia Open GL+Geforce.
>
> It did not work ;-(
>
> I tracked down the reason: I was pushing two times a matrix into
> the projection stack. Geforce driver apparently only
> implements two-level projection stack, which is OK
> according to OpenGL spec.
>
> 1) I guess the Mesa default might as well be the allowed minimum.
I don't feel strongly about this. Anyone else?
> 2) when looking at matrix.c I noticed that the overflow conditions
> are different for Modelview and for (projection & texture).
> I think that the ModelView is ok and Projection & Texture are wrong.
> (With the current code, if I define MAX_PROJECTION_STACK_DEPTH == 2
> it will allow two push operations, which I think is not
> how Red Book describes "stack depth == 2))
You're right. I'm fixing it.
> 3) I think than in types.h all the stacks could be allocated to
> be one element smaller, this because the top of stack is kept
> in separate location. (but I did not check this too well).
Right.
-Brian
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