# Documentation/Shader library

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Pixie comes with a library that allows you to query a compiled shader for its parameter. SDR lib exports the following two functions:

    TSdrShader *sdrGet(const char *);

    void sdrDelete(TSdrShader *);

The first function is used to get the shader info i.e.: `sdrGet("matte.sdr")`. The second function can be used to free the structure returned be `sdrGet`. The structure `TSdrShader` contains the shader and parameter information. See the source code for "sdrinfo" for example usage.

The structure `TSdrShader` is defined as:

    typedef struct TSdrParameter {
    	char          *name;         // Name of the parameter
    	ESdrType      type;          // Type of the parameter
    	ESdrContainer container;     // Container class of the parameter
    	int           numItems;      // Number of items (the number of items if an array, 1 otherwise)
    	char          *space;        // The space that the default value is expressed in
    	UDefaultVal   defaultValue;  // The default value
    	struct TSdrParameter *next;  // The next parameter
    } TSdrParameter;

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