[Mesa3d-users] Mesa Botteneck?

[John G. <je...@vi...>]

Hello, I originaly sent this to the opengl.org forums, but didn't get
much help, aside from someone suggesting that it is a HW acceleration
problem. (Not the case, my Voodoo2 runs all the latest Linux OpenGL
games perfectly. (I actually bought the card specifically for Tuxedo T
Penguin: A Quest for Herring, (This was before the large array of
commercial game ports came in.) So am sure that it is hardware
accelerating correctly. I'll just paste my post from opengl or to save
from having to retype it all. I have since posting it removed the
glFrustum and glViewport calls from the main loop, with no speed
increase. Also I forgot to expand the i3dTranslate and i3dRotate
functions into the code that they call so you could see what is going on
(I did that for the rest of the functions that I wrote) but I guess you
can figure out what goes on behind the scenes of those two functions. It
is purely opengl code so the botteneck wouldn't be there.

<begin repost>

Hi,
I'm having a bit of a problem finding out what is causing my code to be
so slow. I have a model rotating with vertex shading and am only getting
about 11 FPS. (The model has 7121 faces so that is about 79,000 polygons
per second). The thing is I have tried it at resolutions from 320x240 up
to 800x600 and the framerate is always the same, so my rendering code
shouldn't be the problem, correct? Further evidence that it is not the
rendering code causing the problem is that I switched from a for loop
that calls glcolor, glnormal, and glvertex one time for each face, to
using glDrawArrays and didn't notice any improvement whatsoever in
framerate. The problem is that there is very little in the form of
non-gl code in the main loop. The main loop looks like this:

for(i = 0; i < 100; i++){
 glViewport (0, 0, (GLsizei) W, (GLsizei) H);
 glMatrixMode (GL_PROJECTION);
 glLoadIdentity ();
 glFrustum (-1.0, 1.0, -1.0, 1.0, MinDepth, MaxDepth);
 glMatrixMode (GL_MODELVIEW);

 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

 glMatrixMode(GL_MODELVIEW);
                   glLoadIdentity();

                  
i3dTranslate(-Camera->position[VALUE_X],-Camera->position[VALUE_Y],-Camera->position[VALUE_Z]);
i3dRotate(-Camera->angle[VALUE_X],-Camera->angle[VALUE_Y],
-Camera->angle[VALUE_Z]);

/* I'll explain this next line later */
i3dDrawObject(nimitz);

/*I'm using SDL, not Glut */
SDL_GL_SwapBuffers();

Nimitz->angle[VALUE_Y] += 2.0;
}

i3dDrawObjects is of course a function I wrote, in actuality the main
loop has more of my functions than that, but I just expanded them so
you'd know exactly what is going on. 
i3dDrawObject has an if statement that checks for things like texturing,
lighting, etc. so that I be sure to pass the right set of normals and
such. But the main rendering part is here:

glColorPointer(4, GL_FLOAT, 0, Object->colorarray);
glNormalPointer(GL_FLOAT, 0, Object->vnormalarray);
glVertexPointer(3, GL_FLOAT, 0, Object->vertexarray);
glDrawArrays(I3DRenderType, 0, (Object->facecount * 3));

I've actually commented out everything but that to be sure that it
wasn't the if statemnents giving me trouble and still got the same
framerate. Any ideas on what it could be? I've even commented out the
code that adds to the angle of the model. The only thing left is
required GL code. I'd appreciate any help.

<end repost>

is there anything specific to Mesa, (I'm using 3.2 I believe) that would
cause this to happen? Surely if it were a hardware acceleration problem,
reducing the resolution would have fixed it. But all I am passing it
basically pure OpenGL code. I'm rather puzzled. I hope I am not stuck at
79,000 polys/sec. 

--
"I'm willing to J.O.B., just not on no jagg-off shoe-shine tip"
"Jagg-off shoe-shine tip?"
"No *background-checking* jagg-off shoe-shine tip"