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## Technical Data and Computer Software.
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## Pixar Animation Studios
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##

##
##  Smoothstep.slim
##  Implements the shading language smoothstep function
##

slim 1 extensions pixartt {
    extensions pixar pxsl {
        template float Smoothstep {
            description {
		0 if input < minVal; 1 if input >= maxVal; otherwise, a
		smooth Hermite interpolattion between 0 and 1.
	    }
	    parameter float Input {
		detail mustvary
		description {
		    Pattern to feed through smoothstep
		}
		default s
	    }
	    parameter float MinVal {
                label "Min Value"
		description {
		    Threshold below which the function will return 0
		}
		default .2
		range {0 1 .001}
		subtype slider
	    }
	    parameter float MaxVal {
		label "Max Value"
		description {
		    Threshold above which the function will return 1
		}
		default .8
		range {0 1 .001}
		subtype slider
	    }
	    parameter float Scale {
		description {
		    Scale to apply to the result
		}
		detail varying
		default 1
	    }
	    parameter float result {
		access output
		display hidden
	    }
	    RSLSource StaticFunction {
		void
		pxslSmoothstep(float input, minVal, maxVal, scl;
				output float result;)
		{
		    /* calculate the standard smoothstep */
		    result = scl * smoothstep(minVal, maxVal, input);
		}
	    }
        }
    }
}