shadersystem.txt

Shader/Materials system

BSPMaterial: holds a list of key->value pairs and a shader name, used to configure the shader, cached by Filename
BSPMaterialAttrib: stored on nodes, holds a BSPMaterial

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ShaderFeature: defines a group of configurable variables for a particular shader feature (phong, bumpmap, etc),
			   parses the key->value pairs on a BSPMaterial to fill in the variables, cached by BSPMaterial pointer,
			   also adds the necessary permutations and ShaderInputs
example:
	PhongFeature: phongexponent, phongboost, phongtint
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ShaderConfig: defines a list of configurable ShaderFeatures for a particular shader
example:
	LMGConfig: EnvmapFeature, BaseTextureFeature, AlphaFeature, BumpmapFeature, DetailFeature
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ShaderSpec: one instance per shader,
			each time a shader needs to be generated,
			the ShaderSpec will look at the RenderState and ShaderConfig,
			and generate a list of permutations and ShaderInputs to supply
			to the generated shader
example:
	LightmappedGenericSpec