#include "tricorn.h"

static const float convergenceLimit = 2.0f;
unsigned converge(float complex position,unsigned n);

void tricorn(float complex start, size_t width, ssize_t height, float res, unsigned n, _Bool color, unsigned char* img){
    
    height = height < 0 ?  height*-1 : height;

    for(size_t i = 0; i < width; i++){
        for(ssize_t j = 0; j < height; j++){

            unsigned value = converge(start + (i*res + I*j*res),n);
            size_t position = (i*width +j) *3;
            if(!color){
                img[position] =  value;
                img[position + 1] = value;
                img[position + 2] = value;
            }
            else{ // TEMPORARY / Bad looking color gradient before testing
                img[position] = (value % 85)*3;
                img[position + 1] = 85 +(value % 85) * 2;
                img[position + 2] = 170 +(value % 85);
            }

        }
    }
}
unsigned converge(float complex position,unsigned n){

    complex float result  = 0;
    for(unsigned i = 0; i < n; i++){
        result = cpowf(conjf(result),2) + position;
        if(sqrtf(crealf(result)+cimagf(result)) > convergenceLimit)
            return 255-4*(i % 64);
    }
    return 0;
}