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C/C++ Source or Header  |  1995-03-22  |  238 b   |  10 lines
  1. /*
  2.  * Preprocessor macros for use in RenderMan shaders.
  3.  * Darwyn Peachey, June, 1994.
  4.  */
  5.  
  6. #define snoise(x)    (2*noise(x) - 1)
  7. #define PULSE(a,b,x) (step((a),(x)) - step((b),(x)))
  8. #define boxstep(a,b,x) clamp(((x)-(a))/((b)-(a)),0,1)
  9.  
  10.