RadialGradient.osl

color safe_mix(color onecolor, color anothercolor, float mixvalue)
{
	return mix(onecolor, anothercolor, clamp(mixvalue, 0, 1));
}

float fract(float in)
{
	return abs(fmod(in, 1.0));
}

shader RadialGradient
[[	string label = "Radial Gradient",
	string help = "Simple linear radial gradient",
	string category = "Textures"
]]
( 
	point UV = point(u, v, 0), 
	point Center = point(0.5, 0.5, 0.0),
	float Radius = 0.5, 
	color A = color(1,1,1),
	color B = color(0,0,0),
	float Scale = 1.0, 
	output color Result = 0
)
{
	point pnt = UV / Scale;
	
	float f = 1.0;
	
	float dist = distance(pnt, Center);
	
	if (dist < Radius) f = dist/Radius;
	
	Result = safe_mix(A, B, f);
}