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Two-color angle gradient in Core Image
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kernel vec4 coreImageKernel(__color startColor, __color endColor) | |
{ | |
vec2 point = destCoord(); | |
float angle = atan(point.y, point.x) + radians(180.0); | |
//Start from the upper middle, not the left middle | |
angle += radians(90.0); | |
angle = mod(angle, radians(360.0)); | |
float fraction = angle / radians(360.0); | |
vec4 resultColor = startColor * (1.0 - fraction) + endColor * fraction; | |
return resultColor; | |
} |
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