Re: [Mesa3d-dev] Display List Problem

[Keith W. <ke...@va...>]

Allen Barnett wrote:
> 
> Hi,
> 
> Attached is a short program which demonstrates a problem with display
> lists in the current CVS version of Mesa. It appears that if a triangle
> strip with exactly 216 vertices is compiled into a display list, an
> error occurs in the processing of the display list which prevents the
> execution of subsequent commands in the display list. From looking at
> the code, it's related to the size of the cassette data structure. In
> this case, the END element of a 216 vertex triangle strip goes into the
> first element of a separate cassette. It is only this case that appears
> to give trouble; if there are more or fewer than 216 elements, it works
> OK.
> 
> Compile the attached program and run with:
> 
> $ gcc -o try10 try10.c -lglut -lGL -lGLU -lm
> $ MESA_DEBUG=1 ./try10
> MMX cpu detected.
> Testing OS support for SSE...yes.
> Test OS support for SEE unmasked exceptions... SIGFPE, yes.
> Test of OS support for SSE passed.
> SSE cpu detected.
> Brian Paul Mesa X11 1.2 Mesa 3.5
> Mesa user error: GL_INVALID_OPERATION in begin/end
> Mesa user error: GL_INVALID_OPERATION in begin/end
> Mesa user error: GL_INVALID_OPERATION in begin/end
> $ gcc -DIMMEDIATE -o try10 try10.c -lglut -lGL -lGLU -lm
> $ MESA_DEBUG=1 ./try10
> MMX cpu detected.
> Testing OS support for SSE...yes.
> Test OS support for SEE unmasked exceptions... SIGFPE, yes.
> Test of OS support for SSE passed.
> SSE cpu detected.
> Brian Paul Mesa X11 1.2 Mesa 3.5
> $
> 
> In the first (error) case, one of the triangle strips just appears as a
> rectangle fading from cyan to yellow. In the second, immediate mode,
> case, both strips are correctly shown as parallel waves. If you adjust
> N_TRIANGLES in the program to be something other than 108, then both
> cases work.
> 

Allen, 

I've fixed this in current CVS - let me know if if fixes your larger problems.

Keith