TGE water upgrade

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This resource adds basic pixel shader and vertex shader support to the TGE waterblock, using CG, and support for drawing a reflected view of the world into a texture and using it in the waterblock. Right now it's windows-only, but there's nothing stopping you from making it work on OSX and Linux, since CG is also avaliable in those platforms.

Note: For those worrying about Cg being Nvidia-only, fear not, I've personally tested it in different ATI cards and it's compatible with no visible performance problems. Just make sure your drivers aren't ancient.

Note2:
Alex Scarborough (of the TLK DRL fame) is working on porting this resource to GLSL and making it work on OSX. Might get some news soon.

Installing the source changes:

First you'll need the CG toolkit. You can get it here:
developer.nvidia.com/object/cg_toolkit.html

After installing it you must modify the TGE project to include the Cg/lib and Cg/include folders to the library paths and the include paths, respectively.

Important: you also need to open cgGL.h in the "Cg/include" folder and replace this:

#include <GL/gl.h>

By this:

#include <dgl/dgl.h>

Otherwise you'll get loads of compile errors.

Included in the zip file are the modified source files. To install into a unmodified TGE 1.4, just replace the TGE files by the ones included. To install in modified TGE sources, use a merge tool, or copy the changes by hand (all changes are comment-tagged), then compile.

Script changes and usage:

The example folder in the ZIP contains the script files you need to actually see the water in the game. The "example/CG" folder must be copied to the same folder as your executable. It contains the vertex and fragment shaders. The filenames are very hardcoded into the source code, unfortunally.

In "example/starter.fps", you'll find a modified playGui.cs and a normal map for using with the water (it's actually one of TSE's water textures).

The modified playGui.cs is required to render the reflection texture. The GameTSCtrl control was modified and now features a flag called "isReflection". Turning it on will make the gameTsCtrl render the world using a reflected camera matrix, based on the first existing waterblock.

Waterblocks will search for a GameTSCtrl called "reflectionGui". If it's found, they'll grab the refleciton texture from it.

Waterblocks also have a new field, called NormalMaptexture. You need a suitable normal map there, otherwise the reflection texture coordinates will be badly displaced.

Known bugs/limitations:

- No refraction support;
- No specular;
- No fog (at most times it looks like the water is fogged, because the reflected scene is fogged);
- No proper support for using a static envornment map instead of a full reflection (it does use the texture, but it remains fixed, and won't rotate along the view, as the original did);
- Sometimes the reflection can go strange and "melt away". Something to do with clip planes;