Constants

By default Xpanda defines following constants:

Constant	Value
`XGLSL`	`true` if the target language is GLSL, otherwise `false`
`XHLSL`	`true` if the target language is HLSL9 or HLSL11, otherwise `false`
`XHLSL9`	`true` if the target language is HLSL9, otherwise `false`
`XHLSL11`	`true` if the target language is HLSL11, otherwise `false`

It is also possible to define custom constants through command line parameters.

All occurrences of constants are automatically replaced by their values!

Constants are especially handy in branching, where they can be used to easily create shader permutations.

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