Re: [Mesa3d-dev] divide by zero in triangle.c

[<jo...@hr...>]

Hi,

>On monday and tuesday I have two free days, so I will fix the error then (at least I hope).
>The fix should be pretty easy, if   dx_tex == dy_tex == 0.0f, then the program does not move over the texture, so one can fill the whole array rgba[n] with the corresponding (constant) texel, indeed if only dy_tex == 0.0f one can simplify the fill-code a 
>lot, but I don't know if this case is generic enough to be worked into the code.
OK thanks

>By the way: Three questions.
>
>1. When this bug happens, what is the value of dTdx, dvdx?
At the moment of the crash (so just ofter printing "test4" in my code of my
previous mail) I find
 dTdx = -0.4115263E-02
 dvdx = -0.1286020E-03

>2. I usually test my code-changes by typing "LD_PRELOAD=~/Mesa/src/.libs/libGL.so demoprog". How can I tell "gdb" that I want to use this library when debugging?
Yeah, but I'm using OpenVMS and not a Unix-flavour. So for me it is
completely different. I just created a non-sharable object library to perform
the debugging. This should also be possible on Unix.

>3. This is a suggestions. I believe that the MIPMAPPING-code calculates which
>texture-level to use for every pixel it draws.
>Since the level of detail should be a monotone function over the
>array rgba[n], wouldn't it be possible (in the case GL_NEAREST_MI
>PMAP_NEAREST and GL_LINEAR_MIPMAP_NEAREST) to calculate the lod at the
>beginning of the array and at the end of the array and if lod is equal at
>these points, to just fill the whole array with a constant level of detail?
Sounds good, but I'm not an expert.

                 Jouk


Ceterum censeo tertium millennium post Christum natum anno MMI incepturum esse

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  Jouk Jansen
		 
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