[FreeWRL-develop] OpenCL and mesh collision

[John A. S. <ast...@cr...>]

Hi all;

I'm coming out from my cave; I have OpenCL doing some Collisions  
against meshes.

It only took me about 3x as long to do this as expected- openCL looks  
very like "C" but it's not.

Anyway, I'll check it in, and, after some book keeping, it will be  
active for some development builds.

Notes off the top of my head:

1) it needs the Vertex Buffer Objects, which entails enabling:

#define SHADERS_2011

and recompiling;

2) some parameters are not yet passed in (avatar radius, double-sided  
or clockwise triangles) but will be done shortly; the OpenCL code  
should handle all this correctly when parameters active;

3) Doug added lots of neat stuff for Walk mode; right now this works  
only for fly and examine modes; now that I know what's going on,  
converting Dougs' other methods for real walking will be relatively  
easy.

4) right now, the OpenCL "kernel" is not compiled into the  
CollisionGPU file; it was easier to write it as a text file and have  
it loaded; no need to recompile while developing this; (it is on  
SourceForge for backup purposes, btw)

5) oh - the OpenCL compile is time intensive; I'll move the compile up  
into the initialization process of FreeWRL, not when it's needed,  
because one can smash through geometry in the time it takes to compile.

6) and, this is avatar-triangle collision; I have left the quick  
"boundingBox" tests to the cpu; they work fairly fast; it's the avatar  
against triangles in large meshes that took lots of processing time.


Whew!!!

JohnS.