constants.h

游戏编程精华02－含有几十个游戏编程例子

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// c_constants contains useful digits, in this case zero
// r_texture0 may be used.
// Note that the linker will usually automatically remove these lines 
// as redundant code if it can, by inserting the initialisation the first time 
// it is referenced
#define ZERO c_constants.x
#define ONE c_constants.y
#define BUMP_SCALE c_constants.z

// We always want the position in v0 and any texture0 coordinate in v1.
// This is to ensure the gloss pass can map to the vertex stream.  It's also a nice
// way to show how you can mix and match fixed vs variable types.
#define FIXED_POSITION v0
#define FIXED_POSITION_LOCATION 0

#define FIXED_TEXTURE0 v1
#define FIXED_TEXTURE0_LOCATION 1