Does the Blender Game Engine Support Texture Nodes? I have a nice procedural dirt texture made up for a sphere, but when I play the game with an object that utilizes the texture, it will only show the color of the defuse and completely ignore any textures. 

Even when I switch back to the Blender Render mode, the renders will not display the texture.
Hopefully this image will give you some context.
If you are using GLSL shading mode, and the Nodes option is checked in the render tab of the properties window (by default it is); then the BGE supports material nodes. However procedural textures, and generated texture coordinates are not supported.




To be able to use your procedural material, you will have to bake it, then use the resulting image in a new material in the game.