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#ifndef SDF_2D
#define SDF_2D
float2 rotate(float2 samplePosition, float rotation){
const float PI = 3.14159;
float angle = rotation * PI * 2 * -1;
float sine, cosine;
sincos(angle, sine, cosine);
return float2(cosine * samplePosition.x + sine * samplePosition.y, cosine * samplePosition.y - sine * samplePosition.x);
}
float2 translate(float2 samplePosition, float2 offset){
//move samplepoint in the opposite direction that we want to move shapes in
return samplePosition - offset;
}
float2 scale(float2 samplePosition, float scale){
return samplePosition / scale;
}
float circle(float2 samplePosition, float radius){
//get distance from center and grow it according to radius
return length(samplePosition) - radius;
}
float rectangle(float2 samplePosition, float2 halfSize){
float2 componentWiseEdgeDistance = abs(samplePosition) - halfSize;
float outsideDistance = length(max(componentWiseEdgeDistance, 0));
float insideDistance = min(max(componentWiseEdgeDistance.x, componentWiseEdgeDistance.y), 0);
return outsideDistance + insideDistance;
}
#endif
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