Underwater Terrain Shading

This is the shader code for the stuff posted in the topic here: www.garagegames.com/mg/forums/result.thread.php?qt=39336

There are a few things I need to mention though. Unfortunately, I can't get it to work with Atlas2. I've not the time to learn the ins and outs of Atlas2 to get this working smoothly, so I'll just post the code here that I used in the past and let someone who knows the Atlas code better try to work it in. If someone out there does get it working, at least please post the solution... Otherwise I'd rather not you use it at all if you don't share your help.

Anyhow, the way this was setup to work was as a second pass called through the Atlas material with a multiply blend function. It would work out the shade value for the terrain underwater and just times that by the actual color.

It starts with a small engine change. I know this could probably be done better. And i've no clue the effect multiple waterblocks has. But this is to get the waterblock's size and position into the shader so we can check if the pixel is underwater. This goes in waterblock.cpp, in setShaderParams:

reg[0] = mObjScale.x;
   reg[1] = mObjScale.y;
   reg[2] = mObjScale.z;
  GFX->setPixelShaderConstF( 9, (float*)reg, 1 );

  Point3F pos = this->getPosition();
  reg[0] = pos.x;
   reg[1] = pos.y;
   reg[2] = pos.z;
  GFX->setPixelShaderConstF( 11, (float*)reg, 1 );

  reg[0] = mBaseColor.red;///mBaseColor.alpha ;
   reg[1] = mBaseColor.green;///mBaseColor.alpha;
   reg[2] = mBaseColor.blue;///mBaseColor.alpha;
   reg[3] = mBaseColor.alpha;
   GFX->setPixelShaderConstF( 17, (float*)reg, 1 );

The shader requires 2.0, so assemble any material def's with it with that in mind.

And now the shaders itself. These aren't modified or cleaned up, this is just the stuff I used that works. No big deal to clean it up anyhow really. You get the idea.