[CsMain] Just created a new 3D renderer

[Jorrit T. <Jor...@uz...>]

I added new infinite 3D renderer for statistics gathering. This
is a theoretical infinite speed renderer with which you can
exactly time what work the engine is doing and what the
maximum theoretical FPS for the engine is.
This renderer doesn't even create a window so it is not
interactive at all. This means that you have to prepare a
bit in order to use it. First start with a normal renderer
and go to some spot that you want to benchmark. Press shift-C
there to record the position (in 'coord'). Then quit and
restart walktest with the following parameters:

    walktest level -video=infinite -exec=perf.scr

perf.scr is an example script that will turn on the c-buffer,
restore the camera to the location, render a number of frames
and then quit CS.

I also added -overdraw commandline option for the infinite 3D renderer
so that you have additional testing for the overdraw ratio
per frame. The overdraw ratio is the ratio of drawn pixels
compared to the number of screen pixels. A ratio of one means
no overdraw. A ratio less than one means underdraw (i.e. not
all of the screen is rendered). Note that since the default
clipper in CS is actually slightly less than the screen size
you will get something like 0.98 also even if you have perfect
no overdraw.

Note that overdraw testing SLIGHTLY increases the infinite
3D renderer processing time so this means that performance
might go down a little.

Added -fastmesh commandline option for the infinite 3D
renderer which simulates a renderer that has hardware accelerated
transforms. In other words, DrawTriangleMesh and DrawPolygonMesh
will not do any transformation from world->screen space anymore
as it happens when -fastmath is not used. Note that this
invalidates the accuracy of the overdraw testing. So you should
probably not combine both options.

Greetings,

--
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Jor...@uz..., University Hospitals KU Leuven BELGIUM

Five exclamation marks, the sure sign of an insane mind.
        -- (Terry Pratchett, Reaper Man)
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